close

Вход

Забыли?

вход по аккаунту

?

JP2016129367

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2016129367
Abstract: To provide a speaker capable of properly dissipating the heat generated by the
conversion of an audio signal to mechanical vibration to the outside. A diaphragm (3), a magnetic
circuit (ZK), a voice coil (6) disposed in the gap (Gp) so as to vibrate integrally with the
diaphragm (3), and a ventilation path including a gap (Gp) The flow rate of air passing through
the through hole 13a1 of the pole piece 13a, the internal space SP1, the gap Gp, the damper rear
space SP2, the opening 7a of the damper holder 7, the opening 1c of the frame 1 and the air
passage And a flow restricting portion (valve restricting member 14, valve member 15) which
restricts the flow rate to be smaller than the flow rate in the other direction. [Selected figure]
Figure 1
スピーカ
[0001]
The present invention relates to a speaker, and more particularly to a speaker having a heat
dissipation structure for suppressing a temperature rise due to heat generated with vibration.
[0002]
In the speaker, heat is generated when the input sound signal is converted into mechanical
vibration as a sound output.
If this heat is accumulated and the temperature of the magnetic circuit, the voice coil, etc.
13-05-2019
1
becomes excessively high, problems such as peeling of the adhesive used for fixing between
members and burning of the voice coil may occur. Therefore, in order to prevent the magnetic
circuit, the voice coil, and the like from being excessively heated, various speakers having a heat
dissipation structure are conventionally proposed.
[0003]
There is a speaker described in Patent Document 1 as an example. The speaker described in
Patent Document 1 has a heat dissipation structure in which an air intake hole and an air
discharge hole communicating the external space and the internal space of the speaker are
formed in the center pole in the drive axis direction and the air hole is the hole. A valve is
provided for limiting the flow of air passing through in the direction of intake into the speaker,
and a valve for limiting the flow of air passing in the direction of exhaust to the outside is
provided in the exhaust hole.
[0004]
With this heat dissipation structure, intake and exhaust are alternately performed from the
intake and exhaust holes according to the vibration operation of the diaphragm, and the hot air
in the internal space and the room temperature air in the external space are replaced, and the
speaker magnetic circuit It is said that it is possible to suppress the temperature rise of the
[0005]
JP-A-8-102994 (paragraph numbers: 0024 to 0027, FIG. 2)
[0006]
By the way, in the speaker described in Patent Document 1, the space opened on the speaker
inner side of the intake and exhaust holes is a space substantially surrounded by the center pole,
the voice coil bobbin, and the center cap (hereinafter referred to as an internal space A). Is
called).
Therefore, when the diaphragm including the center cap vibrates, most of the air replaced with
air in the outer space becomes hot air in the inner space A, and a space connected to the inner
space A by a narrow flow path, that is, a voice coil It has been difficult to say that the heat air in
13-05-2019
2
the space inside the magnetic circuit (see paragraph 0025 of Patent Document 1) where heat is
accumulated and the heat air stagnates and the air in the external space are sufficiently replaced.
[0007]
On the other hand, the positions where the intake and exhaust holes open in the space outside
the speaker are in the outer surface of the center pole, and the both holes are relatively close to
each other.
Therefore, even when the hot air in the internal space A is exhausted from the exhaust port to
the external space, there is a possibility that a part of the exhausted hot air may be again inhaled
from the intake port. In particular, when the installation posture of the speaker is such that the
intake hole is above the exhaust hole, it may happen that the majority of the drawn outside air
becomes hot air.
[0008]
Therefore, the speaker described in Patent Document 1 is considered to have sufficient room for
further improving the heat radiation effect with respect to the heat radiation structure for
suppressing excessive temperature increase such as a magnetic circuit.
[0009]
Therefore, the problem to be solved by the present invention is to provide a speaker capable of
satisfactorily dissipating the heat generated in the process of converting an audio signal into
mechanical vibration in order to suppress excessive temperature rise of a magnetic circuit or the
like. It is in.
[0010]
In order to solve the above problems, the present invention has any one of the following
configurations 1) to 5).
1) A diaphragm, a magnetic circuit, a voice coil disposed so as to vibrate integrally with the
13-05-2019
3
diaphragm in a gap of the magnetic circuit, a ventilation path including the gap in the middle,
and the ventilation A flow restricting portion provided in the path for restricting the flow rate of
the passing air in one direction to be smaller than the flow rate in the other direction, one side is
integrated with the magnetic circuit, and the other side is the outer peripheral edge of the
diaphragm Are connected via an edge, and a frame having an opening at a portion between the
one side and the other side, and the voice coil wound and connected to a bobbin connection hole
formed in the diaphragm A voice coil bobbin, and a center cap having a hole and attached to the
diaphragm so as to cover an opening at one end of the voice coil bobbin, and the ventilation path
has one end opened by the frame The speaker is in communication with the external space
through the mouth and at the other end side is in communication with the external space
through the hole of the center cap.
2) The speaker according to 1), wherein the flow restricting portion restricts a flow rate of air
flowing through the opening of the frame. 3) The speaker according to 1), wherein the flow
restricting portion restricts a flow rate of air flowing through the hole of the center cap. 4) The
said flow control part is a speaker as described in any one of 1)-3) characterized by being
provided detachably. 5) The speaker according to any one of 1) to 4), wherein the flow restricting
portion is capable of adjusting the ratio of the flow rate of air in one direction to the flow rate in
the other direction. It is.
[0011]
According to the present invention, an effect is obtained that the heat generated in the process of
converting an audio signal into mechanical vibration can be favorably dissipated to the outside.
[0012]
It is a sectional view for explaining Example 1 of a speaker concerning an embodiment of the
invention.
FIG. 5 is an enlarged cross-sectional view of a main part in the first embodiment. FIG. 2 is a
perspective exploded view of the main part in the first embodiment. FIG. 7 is a first crosssectional view for explaining an operation in the first embodiment. FIG. 7 is a second crosssectional view for explaining the operation of the first embodiment. It is 1st sectional drawing for
demonstrating the operation | movement of Example 2 of the speaker based on the form of the
Example of this invention. FIG. 14 is a second cross-sectional view for explaining the operation of
the second embodiment. It is 1st sectional drawing for demonstrating the operation | movement
13-05-2019
4
of Example 3 of the speaker based on the form of the Example of this invention. FIG. 21 is a
second cross-sectional view for illustrating the operation of the third embodiment. It is 1st
sectional drawing for demonstrating the operation | movement of Example 4 of the speaker
based on the form of the Example of this invention. FIG. 21 is a second cross-sectional view for
illustrating the operation of the fourth embodiment. It is the front view and sectional drawing
which show Example 5 of the speaker based on the form of the Example of this invention. FIG. 21
is a partial cross-sectional view for explaining the main part of the fifth embodiment. It is a
fragmentary sectional view for explaining modification 1. FIG. 18 is a cross-sectional view for
explaining the operation of the modification 2; FIG. 18 is a cross-sectional view for describing the
main part of the modification 2; It is a schematic diagram of the structure of Examples 1-5.
[0013]
A speaker according to an embodiment of the present invention will be described by way of
preferred embodiments and modifications with reference to FIGS.
[0014]
EXAMPLE 1 FIG. 1 is a cross-sectional view for explaining the speaker 51 of Example 1. FIG.
Each of the front and back directions in the following description is defined by the direction
indicated by the arrow in FIG. The speaker 51 has a frame 1 forming a step-like annular outer
peripheral wall whose diameter decreases toward the rear side with respect to the axis line CL 1,
a vibrating portion SD attached to the frame 1 so as to be able to vibrate in the front-rear
direction It has a magnetic circuit unit ZK attached to the rear part and converting an input
electric signal into mechanical vibration in cooperation with the voice coil 6 (described later) of
the vibration unit SD. The frame 1 is formed of, for example, metal, and a plurality of openings 1c
are formed on the outer peripheral wall at predetermined intervals in the circumferential
direction. Further, an annular damper holder 7 is fixed at a position generally corresponding to
the opening 1 c in the front-rear direction on the inner surface of the frame 1. The damper
holder 7 is formed with a plurality of openings 7a at predetermined intervals in the
circumferential direction. The opening 1 c of the frame 1 and the opening 7 a of the damper
holder 7 may be provided at positions and ranges corresponding to each other in the
circumferential direction.
[0015]
The vibrating portion SD is formed in a substantially mortar shape centered on the axis line CL1
13-05-2019
5
and an annular edge 2 to which an outer peripheral side edge portion is attached with respect to
a flange 1a annularly formed at the front side end of the frame 1, The outer peripheral edge is
attached so as to close the diaphragm 3 connected to the inner peripheral side edge of the edge
2 and the circular opening 3a formed at the center of the diaphragm 3, and the sectional shape is
the front A voice coil bobbin 5 formed into a projecting arc-shaped center cap 4 and a cylindrical
shape centering on an axis line CL1 and having a front end side inserted through the opening 3a,
and a voice coil bobbin 5 The voice coil 6 is wound in a predetermined range from the rear end
side to the front, and is formed in a bellows-like shape by repetition of a substantially disc-like
concentric concavo-convex rib, and the outer peripheral edge portion is fixed to the damper
holder 7 It is configured to have a damper 8 that inner peripheral edge portion is fixed to the
distal end side outer peripheral surface of the voice coil bobbin 5, a.
[0016]
In this configuration, the diaphragm 3 is capable of vibrating in the front-rear direction through
the edge 2 and the damper 8 with respect to the frame 1 together with the center cap 4
integrated with the diaphragm 3 and the voice coil bobbin 5 and the voice coil 6. It is supported.
[0017]
The lead of the voice coil 6 is connected to a connection terminal 10 fixed to the frame 1 via a
fiber-coated electric wire 9.
Therefore, the input voice signal coming from the outside is supplied to the voice coil 6 through
the connection terminal 10 and the fiber-coated wire 9.
[0018]
The magnetic circuit portion ZK includes a ring-shaped magnet 11, an annular flat plate top plate
12 fixed on the front side of the magnet 11, and a pole piece 13a inserted from the rear side into
the central opening of the magnet 11 and the top plate 12. A yoke 13 fixed to the rear side of the
magnet 11 is configured to have a flange portion 13 b formed to project radially outward on the
rear end side of the pole piece 13 a.
The magnetic circuit portion ZK is integrated with the rear end portion 1b of the frame 1 by
13-05-2019
6
fixing the top plate 12 by screwing or the like.
[0019]
In the above-described configuration, the voice coil 6 is disposed in the gap Gp which is a narrow
annular space between the pole piece 13 a and the top plate 12 so as not to contact the pole
piece 13 a and the top plate 12. Therefore, when an AC input voice signal is supplied to the voice
coil 6 through the connection terminal 10, the voice coil 6 vibrates in the front-rear direction by
Lorentz force generated corresponding to the input voice signal. That is, the voice coil 6 and the
voice coil bobbin 5 integral with the voice coil 6 and the diaphragm 3 vibrate integrally in the
front-rear direction. In conjunction with this, the edge 2 connected to the diaphragm 3 and the
damper 8 connected to the voice coil 6 also move in the front-rear direction.
[0020]
The damper 8 together with the edge 2 supports the diaphragm 3 so that the voice coil 6 does
not contact the top plate 12 and the pole piece 13a in the gap Gp, and gives a predetermined
braking to the vibration. Further, the presence or absence of the air permeability of the damper 8
and the degree of air flow in the case of having the air permeability are not limited.
[0021]
In the speaker 51, a through hole 13a1 extending in the front-rear direction is formed in the pole
piece 13a. The through hole 13a1 is, for example, a hole centered on the axis line CL1. The
detailed structure in the vicinity of the opening 13a2 on the front side of the through hole 13a1
will be described with reference to FIGS. 2 and 3 as well. FIG. 2 is an enlarged cross-sectional
view of the vicinity of the opening 13a2, and FIG. 3 is an exploded perspective view of the
vicinity of the opening 13a2.
[0022]
The opening 13a2 of the through hole 13a1 opens at the bottom surface 13a5 of the recess
13a4 that is circularly recessed with respect to the front surface 13a3 of the pole piece 13a. The
13-05-2019
7
front surface 13a3 and the bottom surface 13a5 are connected by an inclined portion 13a6
which decreases in diameter toward the bottom surface 13a5. The valve control member 14 and
the valve member 15 are attached to the bottom surface 13a5 with the valve member 15 on the
front side. Hereinafter, the valve control member 14 and the valve member 15 are collectively
referred to as a valve 16.
[0023]
The valve control member 14 has an annular outer frame portion 14k and a mesh portion 14a
supported by the outer frame portion 14k. The mesh portion 14a has sufficient breathability, and
the form of the mesh is, for example, plain weave. In the valve control member 14, the diameter
of the mesh portion 14a is set to be equal to or larger than the inner diameter of the through
hole 13a1. Further, the mesh portion 14a has a sufficient gap between the weaves so that air can
freely flow in any of the front and back directions. The weave mode of the net is not limited to
plain weave. The material of the valve control member 14 is not limited to metal for the outer
frame portion 14k and the mesh portion 14a. Different materials may be used. Examples of
materials other than metal are resin, woven fabric and non-woven fabric. Further, the mesh
portion 14a may be a so-called punching metal (made of metal, resin made of resin) instead of
the mesh. Moreover, the sheet-like woven fabric or nonwoven fabric which has air permeability
may be sufficient.
[0024]
The valve member 15 has an annular outer frame portion 15k, and a flap 15b extending from
the outer frame portion 15k toward the center and divided into a plurality of sheets by a plurality
of radial incisions 15a. In this example, the notches 15a are, for example, in a cross shape, and
the number of flaps 15b is four. The shape of the cut 15a and the number of the flaps 15b are
not limited.
[0025]
The valve member 15 is formed of a flexible material (for example, silicone rubber). Each flap
15b formed to extend in the inner diameter direction from the annular outer frame portion 15k
has a sufficiently small thickness. Specifically, the thickness of the flap 15b is set so as to be
easily deformed against a slight air flow trying to pass through the valve member 15 and to allow
13-05-2019
8
the flow in consideration of the characteristics of the material. There is. Therefore, in FIG. 2, for
example, when the pressure on the through hole 13 a 1 side (rear side) is increased and air is to
flow forward in the through hole 13 a 1, the air is a mesh portion of the valve restricting member
14. After passing through 14a, the flap 15b of the valve member 15 can be pushed and bent as
shown by a two-dot chain line to form a sufficient gap for air flow. Thus, the air passes through
the valve regulating member 14 and the valve member 15 and escapes to the front side. That is,
air flow from the rear to the front (see the open arrow) in the valve member 15 is permitted.
[0026]
On the other hand, when the pressure on the front side of the through hole 13a1 becomes higher
and the air flows backward in the through hole 13a1, the air first tries to deform the flap 15b to
the rear side. Do. However, since the mesh portion 14a is disposed close to the rear side of the
flap 15b, the flap 15b abuts on the mesh portion 14a after slight deformation and can not be
deformed any more. Therefore, almost no gap is formed, and air flow from the front side to the
rear side in the through hole 13a1 is substantially prohibited. Thus, the valve 16 operates so as
to restrict the direction of air flow in the through hole 13a1 in one direction by the cooperation
of the valve regulating member 14 and the valve member 15.
[0027]
The flow of air in the drive state (voice output state) of the speaker 51 provided with the valve
16 will be described in detail with reference to FIGS. 4 and 5. FIG. 4 is a cross-sectional view
showing the vibrating part SD moved forward with respect to the reference state in the driven
state of the speaker 51, and FIG. 5 shows the state where the vibrating part SD moved backward
with respect to the reference state. It is a sectional view showing. The flow of air is indicated by
the arrow of the black triangle head. Here, the reference state in which the vibration part SD is
not moving is the state shown in FIG.
[0028]
In the speaker 51, when an alternating current audio signal flows through the voice coil 6, the
oscillating portion SD reciprocates (oscillates) in the front-rear direction with respect to the
position of the reference state according to the time waveform of the signal. When moving to the
front side of the reference state due to this vibration, the volume of the internal space SP1
13-05-2019
9
surrounded by the center cap 4, the diaphragm 3, the voice coil bobbin 5, and the pole piece 13a
increases compared to the reference state. . The flow path connecting the inner space SP1 and
the outer space SP is a flow path passing through the gap Gp, the opening 7a of the damper
holder 7 and the opening 1c of the frame 1 (hereinafter referred to as gap flow path) There are
two flow paths (hereinafter referred to as through-hole flow paths) passing through the holes
13a1. Here, when the volume of the space SP1 increases due to the forward movement of the
vibrating part SD, the pressure of the internal space SP1 becomes negative pressure with respect
to the external space SP, so the inflow of air from the external space SP to the internal space SP1
Be The flow path resistance of the gap flow path at this time is not only the small flow path crosssectional area but also the valve 16 held by the through hole flow path allows the air to flow
forward, so the flow path of the through hole flow path Much larger than resistance. Therefore,
the air on the rear side of the speaker 51 in the external space SP flows into the internal space
SP1 through the through hole flow path while deforming the flap 15b of the valve member 15 so
as to open the flow path forward. . That is, it flows into the internal space SP1 through the
through hole 13a1, the valve regulating member 14 and the valve member 15 (see black triangle
head arrow).
[0029]
The state which moved back with respect to the reference state of vibration part SD in this
structure is shown in FIG. In the state of moving to the rear side, the volume of the internal space
SP1 is reduced compared to the reference state, and the pressure of the internal space SP1
becomes a positive pressure with respect to the external space SP to the external space SP from
the internal space SP1. Flow out of the At this time, since the valve 16 held by the through hole
path prohibits the flow of air rearward, the flow path resistance of the gap flow path is smaller
than the flow path resistance of the through hole flow path although the flow path cross
sectional area is small. It is getting smaller. Therefore, the air in the internal space SP1 is biased
toward the mesh portion 14a on the rear side with respect to the flap 15b of the valve member
15, while passing through the gap Gp, the external space SP on the side from the opening 1c of
the frame 1 Flow out.
[0030]
When air passes through the gap Gp, first, it flows from the inner space SP1 into the gap
between the outer peripheral surface of the pole piece 13a and the inner peripheral surface of
the voice coil bobbin 5 and is pulled backward. Next, when the rear end face of the voice coil
bobbin 5 is directed outward, the flow direction is reversed forward to move the gap between the
13-05-2019
10
outer peripheral surface of the voice coil 6 and the inner peripheral surface of the magnet 11
forward. Furthermore, the space between the outer peripheral surface of the voice coil 6 and the
top plate 12 leads to a space on the rear side of the damper 8 (hereinafter also referred to as a
damper rear space SP2). By the continuation of the vibration, the air flow shown in FIGS. 4 and 5
is alternately and continuously performed.
[0031]
As described above, in the speaker 51, the positions of the intake holes and the exhaust holes are
respectively on the rear surface side and the side surface side with respect to the frame 1, and
both positions are sufficiently separated. Therefore, since hot air does not flow into the internal
space SP1 and the flowing outside air is always at normal temperature, a good heat dissipation
effect can be obtained. Further, the direction of the air flow generated with the back and forth
movement of the vibrating portion SD is determined by the valve 16 in a substantially fixed
direction. That is, it is a route of the through hole 13a1 of the pole piece 13a, the internal space
SP1, the gap Gp, the damper rear space SP2, the opening 7a of the damper holder 7 and the
opening 1c of the frame 1. Strictly speaking, in the damper rear space SP2, a reciprocating air
flow may be generated as the damper 8 moves back and forth, but the air flow direction in the
gap Gp at the portion where the temperature is significantly raised is almost completely constant.
Be determined and maintained.
[0032]
Thus, normal temperature air intermittently supplied from the outside is supplied to the gap Gp
intermittently, and when the normal temperature air passes through the gap Gp, the temperature
of the voice coil 6 and the vicinity thereof is sufficiently removed to raise the temperature. Since
the heat generated by the temperature rise is discharged to the outside without returning to the
gap Gp again, the speaker 51 exhibits high heat radiation efficiency. Further, the increase of the
flow velocity due to the air flowing into the narrow gap of the gap Gp also contributes to the
improvement of the heat dissipation efficiency.
[0033]
Embodiment 2 FIGS. 6 and 7 are cross-sectional views for explaining the operation of the speaker
52 of Embodiment 2. FIG. FIG. 6 is a cross-sectional view showing the vibrating part SD moved
13-05-2019
11
forward with respect to the reference state in the driven state of the speaker 52. FIG. 7 shows the
state where the vibrating part SD moved backward with respect to the reference state. It is a
sectional view showing. 6 and 7 correspond to FIGS. 4 and 5, respectively.
[0034]
The speaker 52 is different from the speaker 51 of the first embodiment in the mounting
position of the valve 16 and the front-rear direction. Specifically, in the speaker 52, the valve 16
is provided at the rear end of the through hole 13a1 of the pole piece 13a. Further, the valve 16
is attached so as to overlap so that the valve regulating member 14 is on the front side (the
internal space SP1 side) and the valve member 15 is on the rear side (the external space SP side).
[0035]
Describing in more detail, a recess 13a8 having a diameter larger than that of the through hole
13a1 is formed at the rear end of the through hole 13a1. An opening 13a7 in the through hole
13a1 communicating with the external space SP is provided on the bottom surface 13a9 of the
recess 13a8. And valve 16 is attached to bottom 13a9. As described above, since the valve
restricting member 14 is disposed on the front side of the valve member 15, the flow of air from
the rear external space SP into the through hole 13a1 is inhibited, and the air is penetrated from
the internal space SP1. The flow of air flowing out to the external space SP through the holes
13a1 is permitted.
[0036]
In the configuration of the speaker 52, the flow path connecting the internal space SP1 and the
external space SP passes through the gap Gp, the opening 7a of the damper holder 7 and the
opening 1c of the frame 1 as in the speaker 51 of the first embodiment. There are two, a gap
channel, and a through hole channel which passes through the valve 16 and the through hole
13a1. Here, as shown in FIG. 6, when the vibrating portion SD moves forward with respect to the
position of the reference state, the volume of the internal space SP1 increases more than the
volume of the reference state, and The pressure becomes a negative pressure with respect to the
external space SP, and air inflow from the external space SP to the internal space SP1 is achieved.
At this time, since the valve 16 held by the through hole path prohibits the flow of air from the
13-05-2019
12
external space SP into the through hole 13a1, the passage resistance of the gap passage is
penetrated although the passage sectional area is small. It is smaller than the flow path
resistance of the hole flow path. Therefore, the air on the rear side of the speaker 52 in the
external space SP is biased toward the mesh portion 14a on the front side with respect to the flap
15b of the valve member 15, while the air on the side of the speaker 52 is an opening of the
frame 1 The portion 1c flows through the opening 7a of the damper holder 7 into the damper
rear space SP2, and further through the gap Gp into the internal space SP2 (see black triangle
head arrow).
[0037]
The state which moved back with respect to the reference state of vibration part SD in this
structure is shown in FIG. In the state of moving to the rear side, the volume of the internal space
SP1 is reduced compared to the reference state, and the pressure of the internal space SP1
becomes a positive pressure with respect to the external space SP to the external space SP from
the internal space SP1. Flow out of the At this time, in addition to the small cross-sectional area
of the gap channel, the valve 16 held by the through hole channel allows air to flow rearward,
that is, allow air to flow out to the external space SP via the through hole 13a1. The flow path
resistance of the gap flow path is much larger than the flow path resistance of the through hole
flow path. Therefore, the air in the internal space SP1 flows out to the rear external space SP
through the through hole flow path while deforming the flap 15b of the valve member 15 so as
to open the back side to form a flow path. That is, it flows out to the rear side external space SP
through the through hole 13a1, the valve regulating member 14 and the valve member 15 (see
black triangle head arrow). By the continuation of the vibration, the air flow shown in FIGS. 6 and
7 is alternately and continuously performed.
[0038]
As described above, in the speaker 52, the positions of the intake holes and the exhaust holes are
respectively on the side surface side and the rear surface side with respect to the frame 1, and
the both positions are sufficiently separated. Therefore, no hot air flows into the internal space
SP1, and the flowing outside air is always at normal temperature, so that a good heat dissipation
effect can be obtained. Further, the direction of the air flow generated with the back and forth
movement of the vibrating portion SD is determined to be substantially constant. That is, it is a
route of the opening 1c of the frame 1, the opening 7a of the damper holder 7, the damper rear
space SP2, the gap Gp, the internal space SP1, and the through hole 13a1 of the pole piece 13a.
Strictly speaking, in the damper rear space SP2, a reciprocating air flow may be generated along
13-05-2019
13
with the forward and backward movement of the damper 8, but the air flow direction in the gap
Gp at the portion where the temperature is significantly raised is almost completely constant. Be
determined and maintained.
[0039]
Thus, normal temperature air intermittently supplied from the outside is supplied to the gap Gp
intermittently, and when the normal temperature air passes through the gap Gp, the temperature
is raised by removing heat from the voice coil 6 and the vicinity thereof. Since the resulting hot
air is discharged to the outside without returning to the gap Gp again, the speaker 52 exhibits
high heat dissipation efficiency.
[0040]
Third Embodiment FIGS. 8 and 9 are cross-sectional views for explaining the operation of the
speaker 53 of the third embodiment.
FIG. 8 is a cross-sectional view showing the vibrating part SD moved forward with respect to the
reference state in the driven state of the speaker 53, and FIG. 9 shows the state where the
vibrating part SD moved backward with respect to the reference state. It is a sectional view
showing. 8 and 9 correspond to FIGS. 4 and 5, respectively.
[0041]
The speaker 53 is different from the speakers 51 and 52 of the first embodiment and the second
embodiment in that the attachment position of the valve 16 is the center cap 4 and that the
through hole 13a1 of the pole piece 13a is not formed. As shown in FIG. 8, a flat seat 4 a is
formed at the center of the center cap 4 of the speaker 53. An opening 4b is formed at the center
of the seat 4a. The shape of the opening 4 b is, for example, circular. In addition, an annular
recess 4c for improving the strength and the like is formed on the radially outer side of the seat
portion 4a. The valve 16 is attached at a position corresponding to the opening 4b on the rear
surface (surface on the pole piece 13a side) of the seat 4a. Further, the valve 16 is attached so as
to overlap so that the valve regulating member 14 is on the front side (the external space SP
side) and the valve member 15 is on the rear side (the internal space SP1 side). Therefore, the
flow of air from the front external space SP through the opening 4b into the internal space SP1 is
permitted, and the flow of air from the internal space SP1 through the opening 4b into the
13-05-2019
14
external space SP is prohibited. It is supposed to be
[0042]
In the configuration of the speaker 53, the flow path connecting the internal space SP1 and the
external space SP is the gap Gp, the opening 7a of the damper holder 7, and the frame 1 because
the through hole 13a1 is not formed in the pole piece 13a. There are two, a gap channel passing
through the opening 1 c and a center cap passage passing through the valve 16 and the opening
4 b of the center cap 4. Here, as shown in FIG. 8, when the vibrating part SD is moved forward
with respect to the position of the reference state, the volume of the internal space SP1 increases
more than the volume of the reference state. The pressure becomes a negative pressure with
respect to the external space SP, and air inflow from the external space SP to the internal space
SP1 is achieved. At this time, in addition to the small cross-sectional area of the gap channel, the
valve 16 held by the center cap channel allows the flow of air backward (inflow to the internal
space SP1). The flow path resistance of the gap flow path is much larger than the path resistance.
Therefore, the air in the external space SP on the front side of the speaker 53 flows into the
internal space SP1 through the center cap flow path while deforming the flap 15b of the valve
member 15 so as to open the flow path backward. . That is, it flows into the internal space SP1
through the opening 4b, the valve regulating member 14 and the valve member 15 (see black
triangle head arrow).
[0043]
The state which moved back with respect to the reference | standard state of the vibration part
SD in this structure is shown in FIG. In the state of moving to the rear side, the volume of the
internal space SP1 is reduced compared to the reference state, and the pressure of the internal
space SP1 becomes a positive pressure with respect to the external space SP to the external
space SP from the internal space SP1. Flow out of the At this time, since the valve 16 held by the
center cap path prohibits the forward flow from the internal space SP1 to the external space SP,
the flow path resistance of the gap flow path is small even though the flow path cross-sectional
area is small. It is smaller than the flow resistance of the Therefore, the air in the internal space
SP1 is urged toward the mesh portion 14a on the front side with respect to the flap 15b of the
valve member 15, while passing through the gap Gp, the opening 7a of the damper holder 7 and
the opening 1c of the frame 1 Flow out into the lateral space SP (see black triangle head arrow).
By the continuation of the vibration, the air flow shown in FIGS. 8 and 9 is alternately and
continuously performed.
13-05-2019
15
[0044]
As described above, in the speaker 53, the positions of the intake and exhaust holes are
respectively on the front side and the side with respect to the frame 1, and both positions are
sufficiently separated. Therefore, since the hot air does not flow into the internal space SP1 and
the flowing outside air is always warm, a good heat dissipation effect can be obtained. Further,
the direction of the air flow generated with the back and forth movement of the vibrating portion
SD is determined to be substantially constant. That is, it is a route of the opening 4 b of the
center cap 4, the internal space SP 1, the gap Gp, the damper rear space SP 2, the opening 7 a of
the damper holder 7, and the opening 1 c of the frame 1. Strictly speaking, in the damper rear
space SP2, a reciprocating air flow may be generated along with the forward and backward
movement of the damper 8, but the flow direction in the gap Gp at the site where the
temperature is significantly raised is almost completely fixed in a certain direction. Be
maintained.
[0045]
Thus, normal temperature air intermittently supplied from the outside is supplied to the gap Gp
intermittently, and when passing through the gap Gp, heat is taken from the heat of the voice coil
6 and its vicinity to raise the temperature, and the hot air formed by raising the temperature is
Since the air is discharged to the outside without returning to the gap Gp again, high heat
dissipation efficiency is exhibited.
[0046]
Embodiment 4 FIGS. 10 and 11 are cross-sectional views for explaining the operation of the
speaker 54 of Embodiment 4. FIG.
FIG. 10 is a cross-sectional view showing the vibrating part SD moved forward with respect to the
reference state in the driven state of the speaker 54, and FIG. 11 shows the state where the
vibrating part SD moved backward with respect to the reference state. It is a sectional view
showing. 10 and 11 correspond to FIGS. 8 and 9, respectively.
[0047]
13-05-2019
16
In the speaker 54 of the third embodiment, the mounting position of the valve 16 attached to the
center cap 4 is changed from the inner surface to the outer surface, and the flow of air flowing
out from the inner space SP1 to the outer space SP is allowed. And the reverse flow is prohibited
in that it is different. As shown in FIG. 10, the center cap 4 of the speaker 54 is formed with a
recess 4 d at its center. The bottom surface 4d1 of the recess 4d is a flat surface, and an opening
4e is formed in the center of the bottom surface 4d1. The shape of the opening 4 e is, for
example, circular. The valve 16 is attached at a position corresponding to the opening 4 e on the
front surface (surface on the external space SP side) side of the bottom surface 4 d 1. The valve
16 is mounted so as to overlap so that the valve regulating member 14 is on the rear side and
the valve member 15 is on the front side. Therefore, the flow of air from the front external space
SP through the opening 4e into the internal space SP1 is prohibited, and the flow of air from the
internal space SP1 through the opening 4e into the external space SP is permitted. It is supposed
to be
[0048]
In the configuration of the speaker 54, the flow path connecting the internal space SP1 and the
external space SP is the gap Gp, the opening 7a of the damper holder 7, and the frame 1 because
the through hole 13a1 is not formed in the pole piece 13a. There are two, a gap channel passing
through the opening 1 c and a center cap passage passing through the valve 16 and the opening
4 e of the center cap 4. Here, as shown in FIG. 10, when the vibration part SD moves forward
with respect to the position of the reference state, the volume of the internal space SP1 increases
more than the volume of the reference state, and The pressure becomes a negative pressure with
respect to the external space SP, and air inflow from the external space SP to the internal space
SP1 is achieved. At this time, since the valve 16 held by the center cap path prohibits the
backward flow of air (inflow to the internal space SP1), the flow path resistance of the gap flow
path is small although the flow path cross-sectional area is small. It is smaller than the passage
resistance of the passage. Therefore, the air on the front side of the speaker 54 in the external
space SP urges the mesh portion 14 a on the rear side with respect to the flap 15 b of the valve
member 15, while the air on the side of the speaker 54 is an opening of the frame 1 It flows into
the damper rear space SP2 from 1c, and further flows into the inner space SP2 through the gap
Gp (see black triangle head arrow).
[0049]
The state which moved back with respect to the reference | standard state of the vibration part
13-05-2019
17
SD in this structure is shown in FIG. In the state of moving to the rear side, the volume of the
internal space SP1 is reduced compared to the reference state, and the pressure of the internal
space SP1 becomes a positive pressure with respect to the external space SP to the external
space SP from the internal space SP1. Flow out of the At this time, in addition to the small crosssectional area of the gap channel, the valve 16 held by the center cap channel allows the air to
flow forward (outflow to the external space SP). The resistance is much larger than the flow
resistance of the center cap flow path. Therefore, the air in the internal space SP1 flows out to
the front external space SP through the center cap channel while deforming the flap 15b of the
valve member 15 so as to open to the front side. That is, it flows out to the external space SP on
the front side of the speaker 54 through the opening 4e, the valve regulating member 14 and the
valve member 15 (see black triangle head arrow). As the vibration continues, the air flow shown
in FIGS. 10 and 11 alternates continuously.
[0050]
As described above, in the speaker 54, the positions of the intake holes and the exhaust holes are
respectively on the side surface side and the front side of the frame 1, and both positions are
sufficiently separated. Therefore, since the hot air does not flow into the internal space SP1 and
the flowing outside air is always at normal temperature, a good heat radiation effect can be
obtained. Further, the direction of the air flow generated with the back and forth movement of
the vibrating portion SD is determined to be substantially constant. That is, it is a route of the
opening 1c of the frame 1, the opening 7a of the damper holder 7, the damper rear space SP2,
the gap Gp, the internal space SP1, and the opening 4e of the center cap 4. Strictly speaking, in
the damper rear space SP2, a reciprocating air flow may be generated along with the forward
and backward movement of the damper 8, but the flow direction in the gap Gp at the site where
the temperature is significantly raised is almost completely fixed in a certain direction. Be
maintained.
[0051]
Thus, normal temperature air intermittently supplied from the outside is supplied to the gap Gp
intermittently, and when passing through the gap Gp, the heat of the voice coil 6 is removed to
raise the temperature, and the hot air formed by raising the temperature is the gap again Since
the heat is discharged to the outside without returning to Gp, high heat dissipation efficiency is
exhibited.
[0052]
13-05-2019
18
<Fifth Embodiment> FIGS. 12A and 12B are a front view and a cross-sectional view for explaining
a speaker 55 of a fifth embodiment.
In the front view of FIG. 12A, the vibrating portion SD of the speaker 55 is not shown. Moreover,
FIG.12 (b) is sectional drawing which cut | disconnected the speaker 55 containing vibration part
SD by cutting-plane line AOB in FIG. 12 (a).
[0053]
In FIG. 12 (a), one opening 1c of the frame 1 is formed to open in an angular range θa. Four
openings 1 c are provided in the frame 1 at angular intervals of 90 °. A through hole 13a1 is
formed in the pole piece 13a, and the internal space SP1 and the external space SP are in
communication with each other. The damper 8 is formed of a material through which air does
not pass, or a material through which the air passes slightly. Further, the air flow path that
substantially communicates the damper rear space SP2 with the external space SP is only the
flow path via the opening 1c other than the gap flow path. Accordingly, the damper rear space
SP2 is a substantially closed space other than the two flow paths. In the speaker 55, the valve 17
is provided corresponding to each of the plurality of openings 1c. The valve 17 is provided, for
example, on the damper holder 7. The valve 17 allows inflow of air from the external space SP
through the opening 1c to the damper rear space SP2, and vice versa from the internal space SP1
through the opening 1c to the external space SP. It works to inhibit the flow of air.
[0054]
A structural example of the valve 17 is shown in FIG. The valve 17 is attached to the damper
holder 7 and has a pair of hook-shaped flaps 17a and 17b. FIG. 13A is a cross-sectional view for
explaining the free state of the valve 17.
[0055]
In FIG. 13 (a), the valve 17 is in contact at a position where the tip end portions of the flaps 17a
and 17b are biased inward, and the flow path is closed. Further, the flaps 17a and 17b
themselves are also formed so as not to be easily deformed outward and to be easily deformed
13-05-2019
19
inward. Therefore, when an air flow (see dashed arrow) from the inside to the outside is applied
to bias the flaps 17a and 17b, the bias acts to strengthen the closure of the flaps 17a and 17b,
and the biasing direction is further enhanced. Is a direction in which the flaps 17a and 17b are
not easily deformed, the valve 17 is maintained in the closed state.
[0056]
On the other hand, as shown in FIG. 13 (b), when the air flow directed inward from the outside
(see the solid line arrow) biases the flaps 17a and 17b, the bias cancels the closure of the flaps
17a and 17b. The valve 17 is opened and air flows, since the biasing direction is the direction in
which the flaps 17a and 17b are easily deformed.
[0057]
Since the valve 17 of this structure is provided at each opening 1c, when the vibration part SD
moves forward, the damper rear space SP2 passes through the opening 1c and the valve 17 and
the side of the external space SP Air flows in from the
Further, air flows from the external space SP into the internal space SP1 through the normally
open through hole 13a1. Next, when the vibration part SD moves to the rear side, the internal
pressure of the damper rear space SP2 becomes high, but here the valve 17 prohibits the air
outflow from the damper rear space SP2 to the external space SP, so the inside of the damper
rear space SP2 The air flows out through the gap path to the outside space SP through the inside
space SP1. By the continuation of the vibration, the repetition of the air inflow and the outflow is
performed alternately and continuously.
[0058]
As described above, in the speaker 55, the positions of the intake holes and the exhaust holes are
respectively on the side surface side and the rear side of the frame 1, and both positions are
sufficiently separated. Therefore, since the hot air does not flow into the internal space SP1 and
the flowing outside air is always at the normal temperature, a good heat radiation effect can be
obtained. Further, the direction of the air flow generated with the back and forth movement of
the vibrating portion SD is determined to be substantially constant. That is, the route is the
opening 1 c of the frame 1, the valve 17, the damper rear space SP 2, the gap Gp, the internal
space SP 1, and the through hole 13 a 1. Strictly speaking, in the internal space SP1, along with
13-05-2019
20
the back and forth movement of the diaphragm 3 and the center cap 4 etc., an air flow
reciprocating between the external space SP and the through hole 13a1 in the always open state
may occur. The flow direction in the gap Gp at the portion where the temperature is significantly
raised is almost completely fixed in a fixed direction and maintained.
[0059]
Thus, normal temperature air intermittently supplied from the outside is supplied to the gap Gp
intermittently, and when passing through the gap Gp, the heat of the voice coil 6 is removed to
raise the temperature, and the hot air formed by raising the temperature is the gap again Since
the gas is discharged without returning to Gp, the heat radiation efficiency is improved. In the
fifth embodiment, in combination with the fourth embodiment, the through hole 13a1 is not
formed. Instead, a hole which is always open is provided in the center cap 4, and the valve 17 is
provided to regulate the air flow in the opening 1c of the frame 1. It is good.
[0060]
Fig.14 (a)-FIG.14 (e) are the figures which each generalized the structure of the above-mentioned
Examples 1-5, and were shown typically. Specifically, in the loudspeaker 51 of the first
embodiment shown in FIG. 14A, the volume of the internal space SP1 is increased or decreased
mainly by the diaphragm 3 and the center cap 4 in the vibrating portion SD. The gap Gp has a
flow passage R1 communicating with the internal space SP1 and a flow passage R2
communicating with the damper rear space SP2. The gap Gp is a thin passage disposed so as to
wrap around the voice coil 6. The volume of the damper rear space SP2 increases or decreases
due to the vibration of the damper 8. The damper rear space SP2 is in communication with the
side external space SP through the opening 1c. In this configuration, the internal space SP1 and
the external space SP are connected by a flow path R3 via a valve 16 which is a check valve. In
the speaker 51, the valve 16 passes only the air flow from the external space SP toward the
internal space SP1.
[0061]
The flow direction which the valve 16 which is a non-return valve permits with respect to the
speaker 51 of Fig.14 (a) is reverse to the speaker 52 of Example 2 shown by FIG.14 (b).
[0062]
13-05-2019
21
In the loudspeaker 53 of the third embodiment shown in FIG. 14C, the center cap 4 for
increasing or decreasing the volume of the internal space SP1 and the external space SP are
connected by a flow passage R4 via a valve 16 which is a check valve. There is.
On the other hand, the flow path R3 is not formed. The flow direction which the valve 16 which
is a non-return valve permits with respect to the speaker 53 of FIG.14 (c) is reverse with the
speaker 54 of Example 4 shown by FIG.14 (d).
[0063]
As for the speaker 55 of Example 5 shown by FIG.14 (e), damper back space SP2 and space SP by
the side are connected by flow-path R5 via the valve 17 which is a non-return valve. Further, in
the inner space SP1, a flow path R1 directed to the gap Gp and a flow path R3 constantly opened
to the outer space SP are connected.
[0064]
As is apparent from these schematic diagrams, the speakers 51 to 55 of the first to fifth
embodiments are a first space (an internal space SP1) which is two spaces whose volume
changes due to vibration based on an external input audio signal. The second space (damper rear
space SP2) is connected via the gap Gp, and the first communication path (flow path R3 or flow
path R4) directly communicating the first space with the external space , And a second
communication passage (opening 1c or flow passage R5) that directly communicates the second
space with the external space, and the flow direction is one direction in the first communication
passage or the second communication passage. A directional check valve (valve 16 or 17) is
provided.
[0065]
The above-described first to fifth embodiments may be modified in various ways without
departing from the scope of the present invention.
[0066]
13-05-2019
22
(Modification 1) In Modification 1, the valves 16 and 17 are detachable.
Here, with reference to FIG. 15, a representative example of the original embodiment will be
described as the speaker 52 of the second embodiment.
FIG. 15 shows the speaker 52 of the second embodiment described with reference to FIG. 6 in
which the valve 16 is replaceable. Specifically, an internal thread 13e is formed on the bottom
surface 13a9 of the recess 13a8 in the pole piece 13a, and the valve control member 14 and the
valve member 15 are fastened and fixed using the washer 18 and the external thread 19.
[0067]
According to this structure, the user can easily attach and detach the valves 16 and 17.
Therefore, for example, at the time of shipment of the speaker product, the valves 16 and 17 may
not be attached, and the valves 16 and 17 may be retrofitted according to the usage conditions
(for example, in the usage where high sound volume is required). is there. In addition, the user
can easily replace the type of valve 16 with a different one. As a thing from which the kind of
valve 16 differs, for example, the thing from which the flow-path cross-sectional area of an open
state differs, and the thing from which the pressure difference used as an open state differs etc.
are. The removable structure of the valve 16 is not limited to the screw. For example, a surface
fastener may be used to make it removable. In addition, it is possible to provide claw shapes that
engage with each other, and to adopt a known detachable structure such as concavo-convex
fitting or snap fit.
[0068]
(Modification 2) Modification 2 is an example using a valve 20 capable of adjusting the threshold
value of the flow path opening and closing, and will be described with reference to FIG. 16 and
FIG. 16 (a) and 16 (b) are cross-sectional views comparable to FIGS. 6 and 7, respectively, and
FIG. 17 is a cross-sectional view for explaining the valve 20. The speaker 52A shown in FIG. 16 is
one in which the valve 16 is replaced with a valve 20 in the speaker 52 of the second
embodiment as a representative example. In the following description, different parts of the
speaker 52 will be mainly described.
13-05-2019
23
[0069]
In the speaker 52A, on the rear end surface of the pole piece 13a, a stepped recess 13d having a
large diameter on the rear side is formed. A ring-shaped receiving seat 13c is attached to the
bottom surface 13d1 of the stepped recess 13d. The receiving seat 13c is formed of a flexible
material such as rubber. The plate 21 is attached to the step 13d2 of the stepped recess 13d. The
plate 21 is formed of metal or the like and has a female screw portion 21a formed at the center
and a plurality of openings 21b circumferentially spaced apart around the female screw portion
21a. An external thread 22 s of an adjusting screw 22 is screwed into the internal thread 21 a of
the plate 21. A knurl is formed on the circumferential surface of the head 22t of the adjusting
screw 22 so that the adjusting screw 22 can be easily turned by the user's finger. A lock nut 23 is
screwed between the plate 21 and the head 22 t of the male screw 22 s of the adjusting screw
22. In addition, a round tray spring seat 22a is attached to the tip end of the adjustment screw
22. One end of a coil spring 24 is fitted in the spring seat 22a. At the other end side of the coil
spring 24, an umbrella-like contact portion 25 is fitted. The contact portion 25 is formed of a
flexible material such as rubber. Specific examples of the material of the receiving seat 13c and
the contact portion 25 include rubber and elastomer having flexibility, and silicone rubber
having excellent heat resistance and noise reduction in addition to the flexibility.
[0070]
The above-mentioned valve 20 can adjust the distance Ha from the plate 21 in the natural state
to the tip of the contact portion 25 in accordance with the amount of extension of the adjusting
screw 22 in the threaded engagement, and locks any adjusted position. The nut 23 can be
maintained by tightening. Then, in a state where the valve 20 is attached to the speaker 52A, the
coil spring 24 is contracted by a predetermined amount so that the contact portion 25 contacts
the receiving seat 13c. That is, in the natural state, the contact portion 25 is pressed against the
receiving seat 13c by the biasing force of the coil spring 24 [state of FIG. 16 (a)].
[0071]
In order to open the valve 20, it is necessary to push back the contact portion 25 with a drag
force greater than the biasing force of the coil spring 24. Therefore, it is possible to adjust the
threshold for opening and closing the valve 20 by increasing or decreasing the amount of
extension of the adjusting screw 22. That is, in the speaker 52A provided with the valve 20, when
air is going to escape from the internal space SP1 to the external space SP through the valve 20,
13-05-2019
24
the pressure difference between the internal space SP1 and the external space SP is a
predetermined value When it becomes more than threshold value Ps), it will be in an open state,
and in less than it will be in a closed state. In addition, when the pressure in the internal space
SP1 becomes negative with respect to the pressure in the external space SP, the air flow from the
external space SP to the internal space SP1 is always prohibited because the valve 20 can not be
opened.
[0072]
In the configuration of the speaker 52A, the flow path connecting the inner space SP1 and the
outer space SP is a gap flow path passing through the gap Gp, the opening 7a of the damper
holder 7 and the opening 1c of the frame 1, the through hole 13a1 and the valve And 20 through
holes. Here, when the vibrating part SD as shown in FIG. 16A moves forward with respect to the
position of the reference state, the volume of the internal space SP1 increases more than the
volume of the reference state, and the internal space SP1 The pressure of (1) becomes a negative
pressure with respect to the external space SP, and air inflow from the external space SP to the
internal space SP1 is achieved. The flow path resistance of the gap flow path at this time is
because the valve 20 held by the through hole path prohibits the flow of air from the external
space SP into the through hole 13a1 even though the flow path cross sectional area is small. And
the flow resistance of the through hole flow path is smaller. Therefore, the air on the side of the
speaker 52A in the external space SP flows from the opening 1c of the frame 1 into the damper
rear space SP2, and further flows into the internal space SP1 through the gap Gp (see black
triangle head arrow).
[0073]
When time elapses from the forward movement of the vibrating part SD shown in FIG. 16 (a), the
vibrating part SD moves rearward with respect to the reference state to be in the state of FIG. 16
(b). In the state of moving to the rear side, the volume of the internal space SP1 is smaller than
the volume of the standard state, the pressure of the internal space SP1 becomes positive
pressure with respect to the external space SP, and the internal space SP1 to the external space
SP Flow out of the At this time, when the pressure difference between the internal space SP1 and
the external space SP is less than the threshold Ps of opening and closing of the valve 20, the gap
flow channel has more flow than the through hole flow channel. Since the path resistance is
small, air flows out from the inner space SP1 to the outer space SP through the gap Gp. The
pressure difference is less than the threshold value Ps when the amplitude of the vibrating part
SD is less than a predetermined value.
13-05-2019
25
[0074]
On the other hand, when the pressure difference between the internal space SP1 and the external
space SP is equal to or greater than the threshold Ps, the valve 20 possessed by the through hole
passage allows air to flow backward, that is, flow out to the external space SP via the through
hole 13a1. Therefore, the flow passage resistance of the through hole flow passage is smaller
than the flow passage resistance of the gap flow passage. Specifically, when the pressure
difference exceeds the threshold value Ps, the air in the internal space SP can push the contact
portion 25 of the valve 20 backward against the biasing force of the coil spring 24, and the valve
20 It will be open. Thus, while the pressure difference is equal to or greater than the threshold
value Ps, the air in the internal space SP flows out through the through hole flow path, that is,
through the through hole 13a1 and the valve 20 to the external space SP (black triangle head
arrow reference).
[0075]
As described above, the speaker 52A of the modification 2 can set an arbitrary threshold Ps by
adjusting the opening and closing of the valve 20 by turning the adjustment screw 22. Thus, the
normal heat radiation mode in which the air flow between the inside and the outside is small with
the operation of the speaker 52A always closing the valve 20 even during the back and forth
movement (vibration) of the vibrating unit SD, and the backward movement of the vibrating unit
SD to some extent In the above case, the valve 20 can be opened to switch between two modes:
an active heat dissipation mode that enables a large amount of air flow between the inside and
the outside and in the gap Gp. The threshold Ps corresponds to the magnitude of the amplitude
of the vibration part SD (in other words, the strength of the input audio signal). It is possible to
perform heat dissipation control in which the heat dissipation mode is shifted to the active heat
dissipation mode only to avoid the excessive temperature rise of the magnetic circuit by the
progress of heat storage.
[0076]
The pressure fluctuation of the internal space SP1 of the speaker 52A and the damper rear space
SP2 affects the vibration mode of the vibrating portion SD. That is, the sound quality is affected.
Therefore, for example, as a speaker system in which the speaker 52A is mounted in a cabinet,
13-05-2019
26
sound quality tuning is performed sufficiently considering the speaker 52A as a normal heat
radiation mode, and large volume reproduction to an extent that excessive temperature rise of a
magnetic circuit or the like is concerned It is very effective to use two modes, such as setting the
threshold Ps so as to shift to the active heat dissipation mode to prevent the occurrence of a
failure of the speaker 52A only when it is performed.
[0077]
Since the flaps 15b, 17a, 17b and the contact portion 25 which contribute to the opening and
closing of the air flow are formed of a soft material, the valves 16, 17, 20 described in the abovementioned respective embodiments and each modification can be opened and closed. There is
virtually no noise such as tapping sound along with. Thereby, a good heat dissipation effect can
be exhibited without affecting the reproduction sound quality of the speaker.
[0078]
The flow direction control structure (member) including the valve, which is used in each of the
embodiments and the modifications described above, may have a structure capable of arbitrarily
adjusting the ratio between the flow rate flowing in one direction and the flow rate flowing in the
other direction. For example, the valves 16, 17, 20 correspond to the case where the flow rate
flowing in one direction is substantially zero in a structure capable of adjusting the flow rate
ratio. As described above, in a broad sense, the flow direction regulating member including the
valve functions as a flow regulating portion which regulates the flow rate in one direction
differently from the flow rate in the other direction or regulates the flow direction in only one
direction. do it.
[0079]
The above-mentioned embodiment and its modification are not limited to the composition
mentioned above, and may be another modification in the range which does not deviate from the
gist of the present invention. Moreover, each Example, each modification, and another
modification can be combined suitably.
[0080]
13-05-2019
27
The valves 16, 17 and 20 described above are disposed in the air flow path, and function as a
flow direction control structure (member) that limits the flow direction of the air in the flow path
to only one direction. Therefore, instead of the valves 16, 17, 20, a flow direction regulation
structure other than having a so-called movable valve structure that regulates the flow direction
by creating the open state and the closed state of the flow path by mechanical movement or
deformation of members. (Member) may be applied. In addition, the flow direction regulation
structure (member) including the valve may not completely shut off the flow in the other
direction opposite to the regulated one direction, but prohibits the flow in one direction which is
permitted. If the flow rate difference in the flow in the other direction is such that the flow rate
ratio exceeds 1, the heat radiation effect is exhibited. In addition, the heat radiation effect
generally corresponds to the flow rate ratio. That is, it is expected that the larger the flow rate
ratio, the larger the heat radiation effect. As a flow direction control structure (member) other
than the valve structure, there is a so-called fluid diode that exhibits different flow resistance
depending on the flow direction.
[0081]
A plurality of flow direction regulating structures (members) may be provided as long as it allows
the air flow in one direction defined in the gap Gp. For example, in the speaker 53 of Example 3
whose schematic structure is shown in FIG. 14C, the flow path R3 including the valve 16 in the
speaker 51 of Example 1 whose schematic structure is shown in FIG. You may provide with flowpath R4 with respect to internal space SP1.
[0082]
In the first embodiment, a circular recessed portion 13a8 is formed on the rear surface of the
pole piece 13a, and the through hole 13a1 is opened on the bottom surface 13a9 (see FIG. 1). As
a modification, the valve member 14 may be overlapped with the valve member 15 on the front
side. Also in the modification of the first embodiment, the same effect as that of the first
embodiment can be obtained. In the second embodiment, the valve 16 is superimposed on the
bottom surface 13a5 (see FIG. 6) of the recess 13a4 formed on the front surface of the pole piece
13a, with the valve regulating member 14 on the front side and the valve member 15 on the rear
side. It is good also as a modification attached. Also in the modification of the second
embodiment, the same effect as that of the second embodiment can be obtained.
13-05-2019
28
[0083]
Reference Signs List 1 frame 1a flange 1b rear end 1c opening 2 edge 3 diaphragm 3a opening 4
center cap 4a seat 4b through hole 4c annular recess 4d recess 4d1 bottom 4e opening 5 voice
coil bobbin 6 Voice coil 7 damper holder 7a opening 8 damper 9 fiber covered electric wire 10
connection terminal 11 magnet 12 top plate 13 yoke 13a pole piece 13a1 through hole 13a2
and 13a7 opening 13a3 front 13a4 and 13a8 recess 13a5 and 13a9 bottom 13a6 Inclined
portion, 13b flanged portion, 13c receiving seat 13d stepped recessed portion, 13d1 bottom
surface, 13d2 stepped portion 13e female screw portion 14 valve regulating member, 14a net
portion, 14k outer frame portion 15 valve member 15a cut, 15b flap, 15k outer frame portion
16,1 , 20 valve 17a, 17b flap 21 plate, 21a internal thread, 21b opening 22 adjustment screw
22a spring seat, 22s external thread, 22t head 23 lock nut, 24 coil spring, 25 contact section 5155, 52A speaker CL1 Axis Gp Gap Ha Distance Ps (for pressure difference) Threshold R1 to R5
Flow path SD Vibration part SP External space, SP1 Internal space, SP2 Damper rear space ZK
Magnetic circuit part
13-05-2019
29
Документ
Категория
Без категории
Просмотров
0
Размер файла
50 Кб
Теги
jp2016129367
1/--страниц
Пожаловаться на содержимое документа