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JP2013102360

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DESCRIPTION JP2013102360
Abstract: PROBLEM TO BE SOLVED: To provide a highly efficient thin speaker having a high
reproduction sound pressure level by reducing a manufacturing operation. SOLUTION: A
diaphragm 2 supported by a frame 5 through an edge 3 provided around the periphery, and an
elongated coil bobbin 6 fixed to a part of the diaphragm 2 and having a voice coil 7 wound on
the outer surface And yoke members 14, 15, 16 having linear parallel parallel mutually opened
magnetic gaps 17 a, 17 b, and the middle portion 18 of the coil bobbin 16 is in the magnetic
gaps 17 a, 17 b of the yoke members. A plurality of magnetic circuit units 10 disposed in the
frame 5 so that both ends 19 are located outside the magnetic gap, and the lower ends of the
respective coil bobbins 16 and the frame 5 are connected. And support members 8 respectively
supporting the coil bobbins 16. [Selected figure] Figure 3
スピーカ
[0001]
TECHNICAL FIELD The present invention relates to a speaker suitable for reproducing bass,
particularly in sound equipment such as flat-screen TVs and displays.
[0002]
Flat-screen TVs, flat-screen displays, etc. often include high-tone, medium-tone and low-tone
speakers as shown in Patent Document 1 (Japanese Patent Application Laid-Open No. 201187146).
11-05-2019
1
This is because, in a flat-screen television, a small and thin speaker is preferably used because
the space for incorporating a speaker is small, and since the speaker can not clearly reproduce
bass, a speaker for bass is additionally used.
[0003]
In general, a low frequency speaker has a large diaphragm, and the height dimension (dimension
in the normal direction of the diaphragm) is often large according to the size of the cone type
diaphragm. For this reason, how to mount these large speakers in a limited space is widely
studied.
[0004]
For this reason, there is a demand for a technique for making the bass speaker as thin as possible
in which the dimension in the height direction tends to be large. For example, as disclosed in
Patent Document 2 (Japanese Unexamined Patent Application Publication No. 2010-288088) or
the like, a panel-type flat plate speaker is used.
[0005]
The flat speaker disclosed in Patent Document 2 provides a thin speaker without using a coneshaped diaphragm. The flat speaker has a configuration in which linear vibration devices are
mounted in parallel to one another or a plurality of annular vibration devices are mounted on a
substrate, and low-frequency sound among sounds generated by a diaphragm of the vibration
device. The sound is transmitted to the substrate and the substrate vibrates to reproduce the bass
sound.
[0006]
JP, 2011-87146, A JP, 2010-288088, A
[0007]
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2
However, in this flat speaker, each excitation device has a magnet, a voice coil, a diaphragm and
the like, and the configuration is complicated.
In addition, since the respective excitation devices are independently provided on the substrate,
the power supply structure to the respective excitation devices becomes complicated, which may
cause a deviation in the supply of the electric signal to the individual voice coils. Furthermore,
since the construction is based solely on the support of the vibration exciter, the substrate is
required to have a considerable strength, and as a result, there is a problem that the sound at the
time of generation of the bass becomes unclear.
[0008]
In addition, since the vibration device is provided with the diaphragm, and the vibration of the
vibration device is transmitted to the substrate, there is a problem that the vertical vibration of
the substrate becomes unstable.
[0009]
Therefore, the technical problem to be solved by the present invention is to provide a thin
speaker capable of realizing high efficiency with a high reproduction sound pressure level with a
simple configuration and reducing the time and effort of manufacturing.
[0010]
The present invention provides a speaker having the following configuration in order to solve the
above technical problems.
[0011]
According to a first aspect of the present invention, there is provided a diaphragm supported by
a frame through an edge provided around the periphery, and an elongated coil bobbin fixed to a
part of the diaphragm and having a voice coil wound on the outer surface. And a yoke member
having a magnetic gap open at both ends in a straight line parallel to each other, and the middle
portion of the coil bobbin is disposed in the magnetic gap of the yoke member while the both
ends are positioned outside the magnetic gap A plurality of magnetic circuit units disposed in the
frame, and support members connected to the lower end portions of the respective coil bobbins
and the frame and respectively supporting the coil bobbins. Provide a speaker.
11-05-2019
3
[0012]
According to a second aspect of the present invention, there is provided the speaker of the first
aspect, wherein the diaphragm is substantially rectangular, and the coil bobbins are provided in
parallel with each other.
[0013]
According to the third aspect of the present invention, the speaker of the first or second aspect is
characterized in that the coil bobbin has a track shape in which longitudinal surfaces are parallel
to each other, and both end sides are formed on arcs. I will provide a.
[0014]
According to the fourth aspect of the present invention, the coil bobbin has a bottom wall
provided with a protruding portion extending downward at the both ends, and the frame has a
through hole at a position where the protruding portion is provided. The present invention
provides the speaker according to any one of the first to third aspects, wherein the support
member is disposed on an outer bottom surface of the frame and coupled to the protrusion
through the through hole.
[0015]
According to a fifth aspect of the present invention, the support member has an outer portion
formed in a thin plate shape and connected to the frame, and an inner portion provided with a
fixing hole into which the protrusion is inserted. The speaker according to any one of the first to
fourth aspects is provided, wherein the inner part is configured to be displaced in the thickness
direction of the outer part.
[0016]
According to a sixth aspect of the present invention, there is provided the speaker according to
the fifth aspect, wherein the support member has a connecting part connecting the outer part
and the inner part.
[0017]
According to the seventh aspect of the present invention, a plurality of yoke members provided
in the magnetic circuit unit are intermittently provided, and the coil bobbin is in the lateral
direction in the gap between the plurality of yoke members. The speaker according to any one of
the first to sixth aspects, further comprising a reinforcing member connecting the surfaces facing
each other.
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4
[0018]
According to the present invention, the magnetic gap of the yoke member can be made into a
simple configuration by making the magnetic gaps parallel to each other with both ends open,
and the gap adjustment with the voice coil is easy. The process can be facilitated.
Furthermore, by setting the coil bobbin to have an elongated shape in which the surfaces facing
in the short direction are parallel, the driving force can be widely transmitted to the diaphragm,
and the vibration linearity of the diaphragm becomes large. Can be reduced.
[0019]
Furthermore, by supporting the lower end portions of the coil bobbin by the support members,
the distance between the diaphragm supporting the coil bobbin and the support member can be
increased, and the stability of the vertical vibration of the diaphragm can be improved.
Thus, the height dimension of the speaker can be reduced.
Therefore, it is possible to provide a thin speaker having high sound level and input resistance.
In addition, by providing a plurality of magnetic circuit units, a large diaphragm can be efficiently
driven, and a speaker suitable for bass reproduction can be configured thinly with a simple
configuration, and a reproduction sound pressure level can be reduced. High efficiency can be
realized.
[0020]
According to the second aspect of the present invention, by providing the coil bobbin provided in
parallel to the rectangular diaphragm, it is possible to efficiently give vibration to the whole
diaphragm.
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5
Therefore, it is possible to thin the speaker suitable for bass reproduction capable of realizing
high efficiency with a high reproduction sound pressure level.
[0021]
According to the fourth and fifth aspects of the present invention, the fixing of the coil bobbin
and the support member can be facilitated, and since the coil bobbin can be reinforced, the coil
bobbin can be made thinner and lighter. .
Further, since the support member can be easily attached from the lower side, the efficiency of
assembly can be increased, and the speaker can be miniaturized.
[0022]
According to the sixth aspect of the present invention, the support member can be formed in a
thin plate shape, and the mounting space of the support member provided on the lower side of
the coil bobbin can be reduced, and the height dimension of the speaker can be reduced. .
[0023]
It is a perspective view showing the appearance composition of the speaker concerning the
embodiment of the present invention.
It is a top view which shows the internal structure of the speaker of FIG.
It is an exploded view of the speaker of FIG.
It is an exploded view of the magnetic circuit unit of the speaker of FIG.
It is sectional drawing in the AA of the speaker of FIG.
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6
It is sectional drawing in the BB line of the speaker of FIG. It is sectional drawing in the CC line of
the speaker of FIG. It is an expanded sectional view of FIG. It is a partial expanded partial cross
section figure of the both-ends vicinity of a coil bobbin. It is a figure which shows the other
structure of a supporting member. It is a figure which shows the attachment structure of a
supporting member and a flame | frame. It is a figure which shows the structure of the speaker
concerning 2nd Embodiment of this invention, and is a top view which shows the example which
attached four magnetic circuit units to the inside of a flame | frame.
[0024]
Hereinafter, a speaker according to an embodiment of the present invention will be described
with reference to the drawings.
[0025]
FIG. 1 is a perspective view showing an appearance of a speaker according to an embodiment of
the present invention.
FIG. 2 is a plan view showing the internal structure of the speaker of FIG. 1, and shows a state in
which the diaphragm is removed. The speaker 1 according to the present invention is a speaker
suitable for bass reproduction used in electronic devices such as thin-type televisions for which a
reduction in the mounting space is required.
[0026]
The speaker 1 of this embodiment accommodates various members such as the magnetic circuit
unit 10 in a substantially square frame 5 having a side of about 100 mm. The diaphragm 2 is
provided on the top surface of the frame 5.
[0027]
The edge 3 is bonded to the outer peripheral end of the diaphragm 2, and the upper frame 4 is
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7
provided on the outer peripheral side of the edge 3. The upper frame 4 is formed in a
substantially square shape corresponding to the substantially square frame 5. In addition, in this
embodiment, although the diaphragm 2, the edge 3, and the upper flame | frame 4 are each
comprised with another member, you may be comprised as one member using a thin resin film
film etc. FIG.
[0028]
The edge 3 is formed of a flexible material, and for example, foam rubber is suitably used. The
edge 3 supports the entire circumference of the diaphragm 2 so that the whole diaphragm 2 can
vertically vibrate integrally.
[0029]
The upper frame 4 is provided around the edge 3 and is a member for connecting the frame 5
and the diaphragm 2. The diaphragm 2 and the edge 3 are fixed to the upper surface of the
frame 5 via the upper frame 4.
[0030]
The magnetic circuit unit 10 is composed of a yoke member and a coil member, the yoke
member is fixed to the frame 5, the coil member is fixed to the diaphragm, and supported from
below by the support member 8 as described later There is.
[0031]
On the back surface of the diaphragm 2, a pair of track-shaped coil bobbins 6 which are parts
constituting the coil members of the magnetic circuit unit 10 are provided.
In the present embodiment, the coil bobbins 6 are provided parallel to each other along two
opposing sides of the diaphragm 2.
[0032]
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8
The voice coil 7 is wound around the entire circumference of the side wall 6 a of the trackshaped coil bobbin 6. The longitudinal length of the coil bobbin 6 is about 70 mm.
[0033]
The upper frame 4 of the diaphragm 2 is engaged with the opening provided above the frame 5.
The opening portion of the frame 5 is provided with a diaphragm fixing portion 11 configured by
a step corresponding to the diaphragm 2, and the attachment position of the diaphragm 2 and
the frame 5 is specified.
[0034]
FIG. 3 is an exploded view of the loudspeaker of FIG. FIG. 4 is an exploded view of the magnetic
circuit unit of the speaker of FIG. FIG. 5 is a cross-sectional view of the speaker of FIG. 2 taken
along line AA. 6 is a cross-sectional view of the speaker of FIG. 2 taken along the line B-B. 7 is a
cross-sectional view of the speaker of FIG. 2 taken along line C-C.
[0035]
As shown in FIG. 3, the frame 5 of the speaker 1 according to the present embodiment is
provided with a yoke fixing portion 30 for fixing the yoke member at a specific position and a
terminal plate fixing portion 31 for fixing the terminal plate 9. ing. The yoke fixing portion 30 is
formed of two upright walls for holding the outside of the yoke 14 in the yoke member, and a
protrusion 32 for engaging with the yoke 14 is provided on the inner surface. The yoke 14 is
provided with an engagement hole 14 b that engages with the projection 32.
[0036]
The terminal plate fixing portion 31 includes a protrusion for locking the outer edge of the
terminal plate 9 and fixes the terminal plate 9 to an intermediate portion of the two yoke
members. The power lines 33 and the coil lead-out lines 7 a from the respective magnetic circuit
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9
units 10 are connected to the terminal plate 9. An audio signal supplied from the power line 33
is sent to the coil lead-out line 7 a via the terminal board 9. In the vicinity of the terminal plate
fixing portion 31 of the frame 5, a guide portion 34 for guiding and fixing the power line 33 to
the bottom surface side of the frame is provided.
[0037]
Support member disposition holes 54 are provided at both ends of the yoke fixing portion 30.
The support member disposition holes 54 have a relief function for preventing the projections 21
provided at both ends of the coil bobbin 6 from interfering with the bottom wall of the frame, as
described later. The support member 8 provided from the outside is positioned.
[0038]
The yoke members are, as shown in FIG. 4, an elongated yoke 14 fixed to a specific location of
the frame 5, a magnet 15 disposed at the bottom of the yoke 14, and a pole 16 provided on the
magnet And consists of
[0039]
The yoke 14 is made of magnetic metal having a U-shaped cross section, and the magnet 15 is
disposed on the bottom surface 14 a.
The elongated magnet 15 is configured to be elongated, and the pole 16 is also elongated and
has substantially the same shape as the magnet 15. Two magnets 15 and poles 16 are disposed
in the yoke 14 with a gap 15 a therebetween. In the gap 15a, a reinforcing member 20a of the
coil bobbin 6 described later is disposed.
[0040]
Between the long side of the side surface of the yoke 14 and the long side of the side surface of
the pole 16, linear magnetic gaps 17a and 17b having two sides parallel to each other and
having equal widths are formed. The magnetic gaps 17a and 17b are open at both ends, and the
width dimension is configured to be about several mm although a slight difference may be seen
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10
depending on the size of the speaker.
[0041]
The magnet 15 of this embodiment uses a Nd-Fe-B rare earth magnet having high residual
magnetization and coercivity and high coercivity even in a small volume, but is not particularly
limited, and is a ferrite magnet It is also good. The rare earth magnet is a Nd-Fe-B neodymium
magnet or a Sm-Co samarium cobalt magnet, and is characterized in that the maximum energy
product (BH) max of the magnet is a large value. .
[0042]
The coil bobbin 6 provided on the diaphragm 2 is a track-shaped cylindrical body, and can be
manufactured by press-forming a light metal such as duralmin or aluminum, a heat-resistant
resin film, or the like. In the present embodiment, an aluminum pressed product having a large
heat dissipation effect is used. The coil bobbin 6 is formed in a track shape in which an
intermediate portion is a straight portion 18 and both ends 19 have a semicircular shape. The
two opposing surfaces of the coil bobbin 6 constituting the linear portion 18 in the short
direction are parallel to each other.
[0043]
As shown in FIG. 6, a portion of the straight portion 18 is disposed in the magnetic gaps 17 a and
17 b of the magnetic circuit unit 10, while both ends 19 are disposed outside the magnetic gaps
17 a and 17 b of the magnetic circuit unit 10. Ru. By arranging only the linear portion 18 in the
opposing magnetic gap of the magnetic circuit unit 10, the width adjustment between the
magnetic gaps can be facilitated by the width of the yoke 14 and the magnet 15.
[0044]
Further, since the linear portions 18 of the coil bobbin 6 and the magnetic gaps 17a and 17b are
configured in parallel to each other, there is a slight deviation in the adjustment of the relative
positional relationship between the magnetic circuit unit 10 and the voice coil 7 in the
longitudinal direction. May be
11-05-2019
11
[0045]
The coil bobbin 6 is provided with a reinforcing member 20a at the center.
The reinforcing member 20 a connects the lower ends of the two opposing straight portions 18
in order to prevent the deformation of the track-shaped coil bobbin 6. As described above, since
the magnet 15 and the pole 16 are divided into two parts, the reinforcing member 20 a is
disposed in the gap 15 a between the two magnets 15 and the pole 16.
[0046]
FIG. 8 is an enlarged cross-sectional view of FIG. As shown in FIG. 7, the coil bobbin 6 is provided
with a voice coil locking portion 41 and a reinforcing rib 43 all around the outer wall 40. The
voice coil locking portion 41 has a step structure provided on the outer side wall 40, and the
voice coil 7 formed by empty winding is formed into a track shape and inserted into the voice
coil locking portion 41, and the upper end is formed. The voice coil 7 is positioned by abutting
against the step 42 of FIG.
[0047]
The reinforcing rib 43 formed on the upper side wall of the coil bobbin 6 is used for bonding
with the bottom surface of the diaphragm 2.
[0048]
Even when an external force is applied to the linear portion 18 of the coil bobbin 6, the
deformation can be prevented by the reinforcing rib 43 provided on the upper end of the outer
side wall 40 and the reinforcing member 20a provided in the central lower portion of the coil
bobbin 6. .
[0049]
FIG. 9 is a partially enlarged partial sectional view of the vicinity of both ends of the coil bobbin.
11-05-2019
12
Lower end portions of the coil bobbin 6 are connected to the thin plate-like support member 8
and fixed to the frame 5 via the support member 8 as described later.
The support member 8 supports the coil bobbin 6 from the lower side.
[0050]
As shown in FIG. 8, bottom plates 20 are provided at both end portions 19 of the coil bobbin 6. A
projecting portion 21 is provided on the lower surface of the bottom plate 20. The projecting
portion 21 extends downward and is inserted into the fixing hole 25 of the support member 8 to
fix the support member 8.
[0051]
The supporting member 8 is a plate-like member, and the outer peripheral part 24 and the inner
peripheral part 22 which are configured in a substantially similar shape are arranged at
concentric positions, and a pleat 23 as an example of a connecting part is provided between
them. There is. The pleats 23 allow the outer peripheral portion 24 and the inner peripheral
portion 22 to move in the thickness direction.
[0052]
In the present embodiment, the support member 8 is formed of a substantially disk-shaped clothformed product, and the outer periphery of the inner peripheral portion 22 having the fixing hole
25 provided in the central portion is located at the outermost peripheral portion by the pleats
23. It is connected to the part (flange) 24. The protruding portion 21 of the coil bobbin 6 is
inserted into the fixing hole 25 and connected to the coil bobbin 6, and the outer peripheral
portion 24 is connected to the support member disposition hole 54 of the frame 5.
[0053]
The support member 8 deforms the pleats 23 to absorb displacement in the height direction of
the flange 24 and the fixing hole 25 when a force in a direction intersecting the surface is
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13
applied.
[0054]
The structure of the support member 8 is not particularly limited as long as it has the abovedescribed function.
Moreover, a metal plate, a resin board, etc. are used suitably for a material. A modification of the
support member 8 is shown in FIG. The support member 8 in FIG. 10 is formed of a thin plate of
synthetic resin, and the outer peripheral portion 24 and the inner peripheral portion 22 are
connected by a thin connection portion 23.
[0055]
The support member 8 is attached to the support member arrangement hole 54 from the bottom
outer side of the frame 5 as shown in FIG. The support member arrangement hole 54 on the
bottom surface of the frame 5 is a through hole for arranging the support member 8. As
described above, since the protruding portion 21 of the coil bobbin 6 is provided so as to
protrude downward, a part thereof is located in the support member disposition hole 54. In this
state, the outer peripheral portion 24 of the support member 8 is attached to the periphery of
the support member arrangement hole 54 from the outer side of the bottom surface of the frame,
and the projecting portion 21 is inserted into the fixing hole 25 of the inner peripheral portion
22 of the support member 8. The frame 5 and the coil bobbin 6 can be connected via the support
member 8 in an easy process by this mounting method.
[0056]
Further, by disposing the protruding portion 21 of the coil bobbin 6 in the support member
disposition hole 54, the thickness dimension of the frame 5 can be reduced, and the speaker can
be thinned.
[0057]
The support member 8 supports the coil bobbin 6 from the lower side at the time of steady state,
11-05-2019
14
in the support member 8 and the coil bobbin 6 arranged in this way.
In addition, since the support member 8 is provided with the pleats 23 in a concentric shape, the
support member 8 can exert a supporting force with respect to stress from any direction along
the surface, for example, the diaphragm 2 faces the front. Even if the speaker 1 is arranged in
such a direction, the coil bobbin 6 can be supported.
[0058]
When the speaker 1 is used, the support member 8 is deformed with the vertical vibration of the
coil bobbin 6. As described above, since the upper end of the coil bobbin 6 is fixed to the
diaphragm 2 and the lower end is supported by the support member 8, the distance between the
support locations is wide, and stable vertical vibration can be secured. In addition, since the
height of the frame 5 can be reduced while securing stable vertical vibration, a thin speaker can
be realized.
[0059]
With the above configuration, the coil bobbin 6 is supported from above and below by the
diaphragm 2 and the support member 8, and the stress applied to the diaphragm 2 is reduced.
Therefore, even if the coil bobbin 6 is made large to increase the sound pressure level, the stress
applied to the diaphragm 2 is reduced, so the diaphragm can be made thinner and lighter.
Therefore, in addition to the improvement of the sound pressure level by the large sized coil
bobbin 6, the improvement of the sound pressure level accompanying weight reduction of a
diaphragm is realizable.
[0060]
FIG. 12 is a view showing another example of the attachment structure of the diaphragm of the
speaker and the coil bobbin. In this example, two pairs of coil bobbins are used for the
diaphragm of the speaker, and the coil bobbins are attached in parallel along each side of the
diaphragm. According to this example, it is possible to increase the number of structures giving
vertical vibration to the diaphragm, and to obtain a speaker with higher output.
11-05-2019
15
[0061]
As described above, according to the speaker according to the embodiment of the present
invention, the coil bobbin 6 is supported so as to be held between the support member 8 and the
diaphragm 2. Therefore, even if the coil bobbin 6 is enlarged, the reinforcement of the
diaphragm 2 can be reduced, and the level of the reproduction sound pressure can be increased.
Moreover, since the distance of the part which supports the coil bobbin 6 can be enlarged, the
vibration linearity of the diaphragm 2 can be improved and thickness reduction of a speaker can
be achieved.
[0062]
The present invention is not limited to the above embodiment, and can be practiced in various
other aspects. For example, the connection structure between the coil bobbin 6 and the support
member 8 can be widely applied as long as a thin plate-like support member is attached to lower
end portions of the coil bobbin.
[0063]
Reference Signs List 1 speaker 2 diaphragm 3 edge 4 upper frame 5 frame 6 coil bobbin 7 voice
coil 8 support member 9 terminal plate 10 magnetic circuit unit 11 diaphragm fixing portion 14
yoke 15 magnet 16 pole 17 a, 17 b magnetic gap 18 straight portion 19 end 20 Bottom plate
20a Reinforcement member 21 Protruding part 22 Inner circumferential part 23 Pleat
(connection part) 24 Peripheral part 25 Fixing hole
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