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JP2011050041

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DESCRIPTION JP2011050041
The present invention provides a diaphragm which has less change in acoustic characteristics,
suppresses warpage of a molded product, and has excellent formability. When n is an integer of
3 or more, a diaphragm (1) has a regular n-gonal outer shape (1gk) inscribed in a circle, and is
provided including the center position (C1) of the circle. A projecting portion (1b) and a ringshaped flat surface portion (1a) surrounding the projecting portion (1b) and extending to the
outer shape portion (1gk), and the projecting portion (1b) and the flat surface portion (1a) The
connecting line (L1) indicating the connecting position with is a closed curve having a center (C2)
different from the center (C1) of the circle, and the flat surface (1a) intersects the connecting line
(1L) at one end and at the one end It has the rib (1c1-1c6) extended so that it might be separated
from a connection line (1L) as it goes to the other end side from the side. [Selected figure] Figure
1
Vibrating plate, spherical shell vibrating plate, and electroacoustic transducer
[0001]
The present invention relates to a diaphragm, a spherical shell diaphragm, and an electroacoustic
transducer.
[0002]
Patent Document 1 according to the applicant's application describes the following
electroacoustic apparatus.
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1
The electroacoustic apparatus includes a spherical shell diaphragm formed into a substantially
spherical shell shape by combining a plurality of diaphragms having a predetermined shape as
an element diaphragm (hereinafter also referred to as an element diaphragm) as an element, and
And a plurality of drive units accommodated inside corresponding to the respective element
diaphragms. Each element diaphragm and the voice coil bobbin of the drive unit corresponding
to each element diaphragm are connected, and the spherical shell diaphragm is driven in the
expansion and contraction direction by the drive unit to emit sound omnidirectionally.
[0003]
Patent Document 1 discloses an example of the shape of an element diaphragm. The external
shape of the element diaphragm is a regular pentagon. A mountain-like projecting portion is
formed in the central portion, and the center thereof coincides with the center of the outer shape.
The outer edge side surrounding the projecting portion is a flat surface portion, and the
boundary between the projecting portion and the flat surface portion is formed to be a circle
centered at a position deviated from the center of the outer shape.
[0004]
JP, 2006-229933, A
[0005]
In the spherical shell diaphragm described in Patent Document 1, a plurality of identical element
diaphragms are used.
Therefore, it is desirable to use the injection molding method for manufacturing the element
diaphragms because the cost reduction effect by mass production can be obtained and the
variation in the characteristics of the element diaphragms can be suppressed to stabilize the
quality. As a material used for injection molding, there is polypropylene (PP) resin, for example.
[0006]
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2
When the diaphragm is formed by injection molding, it is necessary to pay attention to
deformation such as warpage resulting from molding of the molded article. It has been clarified
that when the element diaphragm described in Patent Document 1 is formed by injection
molding, a large warpage may occur at the top of the pentagonal rim. Also, among the apexes of
the pentagon, in particular, at the apex portion where the area of the flat surface portion in the
vicinity is wide (at the apex portion on the opposite side to the direction in which the center of
the boundary between the flat surface portion and the projection portion is biased) A large warp
is likely to occur compared to the top portion of. When a large warpage occurs in the periphery
of the pentagon, when forming a spherical shell diaphragm by connecting a plurality of element
diaphragms via an edge, distortion of the whole spherical shell diaphragm becomes large and the
vibration becomes uneven. There is a possibility that the sound quality of the electroacoustic
transducer using the spherical shell diaphragm may be impaired due to the influence of the
difference between the shape of the diaphragm and the radiation sound itself of each surface.
Therefore, it is desirable that the warpage resulting from the formation of the element diaphragm
be as small as possible.
[0007]
Generally, as a method of suppressing the warpage of a molded article, (a) increase the rigidity of
the material, (b) increase the thickness of the molded article, (c) keep the injection pressure low
and decrease the cooling rate after injection It is known how to make it happen. However, when
the method of (a) is applied to the element diaphragm according to the inventor's investigation,
the frequency characteristic is entirely shifted to the high frequency, and the sound pressure
frequency characteristic, the directional characteristic, and the acoustic characteristic of the
timbre change. It turned out that it happened. In addition, when the method of (b) is applied to
the element diaphragm, the mass of the diaphragm increases, and in the frequency characteristic,
the mid-high region becomes a characteristic shifted to a higher region, and the whole sound
pressure decreases. It turned out that it happened. Moreover, the method of (c) has a subject in
the point to which the productivity of not only an element diaphragm but a molded article falls.
[0008]
Therefore, there is a demand for development of a diaphragm serving as an element diaphragm
in which the change in acoustic characteristics is less, the warpage of a molded product is further
suppressed, and the moldability is excellent. If a spherical shell diaphragm is formed using the
element diaphragm, a spherical shell diaphragm excellent in productivity and small in shape
distortion and excellent in acoustic characteristics can be obtained. In addition, if an
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electroacoustic transducer is manufactured using the spherical shell diaphragm, an
electroacoustic transducer excellent in productivity and excellent in acoustic characteristics can
be obtained.
[0009]
The problem to be solved by the present invention is to provide a diaphragm in which the change
of the acoustic characteristics is less, the warpage of the molded product is further suppressed,
and the formability is excellent. Another object of the present invention is to provide a spherical
shell diaphragm which is excellent in productivity and less in distortion of shape and excellent in
acoustic characteristics. Another object of the present invention is to provide an electroacoustic
transducer which is excellent in productivity and excellent in acoustic characteristics.
[0010]
In order to solve the above problems, the present invention has the following configurations 1) to
6). 1) When n is an integer of 3 or more, it is a diaphragm (1) having a regular n-gonal outer
shape (1gk) inscribed in a circle, including the center position (C1) of the circle A protruding
portion (1b), and a ring-shaped flat surface portion (1a) surrounding the protruding portion (1b)
and extending to the outer portion (1gk), the protruding portion (1b) and the flat surface portion
A connecting line (L1) indicating a connecting position with (1a) is a closed curve having a center
(C2) different from the center (C1) of the circle, and the flat surface portion (1a) It is a diaphragm
(1) characterized by having ribs (1c1 to 1c6) extended so as to be separated from the connection
line (1L) from the one end side to the other end side while intersecting with 1L). 2) When n is an
integer of 3 or more, it is a diaphragm (1) having a regular n-gonal outer shape (1gk) inscribed in
a circle, including the center position (C1) of the circle A protruding portion (1b), and a ringshaped flat surface portion (1a) surrounding the protruding portion (1b) and extending to the
outer portion (1gk), the protruding portion (1b) and the flat surface portion A connecting line
(L1) indicating a connecting position with (1a) is a circle whose center (C2) is a position deviated
in one direction with respect to the center position (C1) of the circle, and the flat surface portion
(1a) In the region (1ak) where the inner region of an imaginary circle (L2) concentric with the
circle with the same diameter as the connecting line (L1) and the outer region of the connecting
line (L1) intersect A diaphragm (1) having ribs (1c1 to 1c5) extending so as to approach the
connection (L1) line and to be separated from the connection line (L1) from one end side to the
other end side It is. 3) The ribs (1c1 to 1c5) extend on one side divided by a straight line passing
through the end closer to the connection line (L1) and the center (C1) of the circle It is a
diaphragm as described in 1) or 2). 4) The rib (1c1 to 1c5) is the diaphragm (1) according to any
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one of 1) to 3), wherein the other end side reaches the outer portion (1gk). 5) A plurality of
diaphragms (1) according to any one of 1) to 4) are provided, and the diaphragms (1) are
connected in a substantially spherical shape via an edge (3) such that their sides face each other
A spherical shell diaphragm (50) characterized in that 6) The spherical shell diaphragm (50)
according to 5) and the spherical shell diaphragm (50) are housed inside and connected to the
plurality of diaphragms (1) of the spherical shell diaphragm (50) An electro-acoustic transducer
(100) comprising: a plurality of drive units (20); and a base (80) on which the plurality of drive
units (20) are fixed.
[0011]
According to the present invention, in the diaphragm, the change in the acoustic characteristics is
less, the warpage of the molded product is further suppressed, and the effect that the formability
is excellent is obtained. In addition, the spherical shell diaphragm is excellent in productivity, less
in shape distortion, and excellent in acoustic characteristics. In addition, the electroacoustic
transducer is excellent in productivity and excellent in acoustic characteristics.
[0012]
It is a three-sided figure for demonstrating the Example of the diaphragm of this invention. It is a
sectional view for explaining the example of the diaphragm of the present invention. It is an
appearance perspective view for explaining an example of a diaphragm of the present invention.
It is an appearance perspective view for explaining the example of the electroacoustic transducer
of the present invention. It is the external appearance perspective view seen from the other angle
for demonstrating the Example of the electroacoustic transducer of this invention. It is a typical
perspective view for explaining the example of the electroacoustic transducer of the present
invention. It is an exploded view for explaining the structure in the example of the
electroacoustic transducer of the present invention. It is a perspective view for demonstrating the
structure in the Example of the electroacoustic transducer of this invention. It is the top view and
sectional drawing for demonstrating the edge in the Example of the electroacoustic transducer of
this invention. It is a top view explaining the middle shape in the middle of manufacture of the
spherical shell diaphragm in the example of the spherical shell diaphragm of this invention. It is a
top view for explaining the example of the electroacoustic transducer of the present invention. It
is sectional drawing for demonstrating the diaphragm junction part in the Example of the
spherical shell diaphragm of this invention. It is a top view of a comparative example, an
example, and a modification for explaining an effect of an example of a diaphragm of the present
invention. It is a graph for demonstrating the effect of the Example of the diaphragm of this
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invention, and a modification. It is a figure explaining the modification in the Example of the
diaphragm of this invention. It is a trihedral view explaining the example of a dimension in the
Example of the diaphragm of this invention.
[0013]
An embodiment of the present invention will be described by means of a preferred embodiment
with reference to FIGS.
[0014]
First, the diaphragm 1 as an element will be described in detail.
1 (a) is a plan view of the diaphragm 1, FIG. 1 (b) is a lower side view in FIG. 1 (a), and FIG. 1 (c)
is a right side view. FIG. 2: is S1-S1 sectional drawing in Fig.1 (a).
[0015]
As shown in FIGS. 1 to 3, the outer shape of the diaphragm 1 of the embodiment is formed in a
regular polygon. Specifically, the outer shape is a regular n-gon (n: an integer of 3 or more)
inscribed in a circle, and in this example, it is a regular pentagon. The vertices of the regular
pentagon are shown as P1 to P5 as shown in FIG. 1 (a). The diaphragm 1 is formed by injection
molding of a resin. An example of the material used is polypropylene (PP) resin. The physical
property modifier may be mixed with pellets of PP resin for molding. As physical property
modifiers, there are mica and Kevlar (registered trademark).
[0016]
The diaphragm 1 has a projecting portion 1b projecting to one side in a central portion, and a flat
surface portion 1a having a flat surface 1a1 surrounding the projecting portion 1b is formed on
the outer side. The flat surface portion 1a extends to a regular pentagonal outer shape portion
1gk. The projecting portion 1b has an annular portion 1k provided on the tip end side, and an
inclined portion 1s having an inclined surface whose section is a curve from the annular portion
1k toward the flat surface portion 1a. Explaining in detail, the annular portion 1k is connected to
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the projecting end surface 1b1 of the ring-like flat surface having a width d1 (see FIGS. 2 and 3)
provided at the tip and the outer peripheral edge of the projecting end portion 1b1 to form a
substantially flat surface portion 1a And a circumferential surface 1b2 formed to be orthogonal
to each other. The center side of the projecting end surface 1b1 is a recess 1b3 that is recessed
toward the flat surface 1a. The recess 1 b 3 is formed, for example, as a spherical surface.
[0017]
The inclined portion 1s has a substantially funnel-shaped curved surface 1s1 connecting the
circumferential surface 1b2 and the flat surface 1a1. Assuming that a line indicating a position at
which the curved surface 1s1 and the flat surface 1a1 are connected is a connecting line L1, the
connecting line L1 is a closed curve having a center different from the center C1 of the outer
shape. For example, as shown in FIG. 1A and FIG. 2, the connecting line L1 is a circle having a
diameter φL1, and the center C2 thereof is at a position deviated by Δd toward the vertex P1
with respect to the center C1 of the outer shape. The curved surface 1s1 is a curved surface set
so that the center of curvature is located on the same side as the projecting side of the protrusion
1b with respect to the flat surface 1a1, and the curvature is such that the curved surface 1s1 is
continuous with at least the flat surface 1a1. Are set to be linked. Here, continuous connection
means that the connection site is connected smoothly without bending. The connecting line L1 is
not recognized as a clear line indicating a bent position when the curved surface 1s1 and the flat
surface 1a1 are connected continuously, but is recognized as a line indicating a change start
position of the curvature It is Even in that case, they are shown as solid lines for convenience.
[0018]
As described in detail with reference to FIGS. 1 to 3, the central axis LC2 (see FIG. 2)
perpendicular to the flat surface 1 a 1 passes through the center C 2 (see FIG. 1) of the
connecting line L 1 having the diameter φL 1. It is at a position biased to the vertex P1 side by
Δd with respect to the central axis LC1 (see FIG. 2) passing through C1 (see FIG. 1). Therefore,
the curved surface 1s1 has the largest radius of curvature R1 (as the center of curvature QC1) at
the position toward the vertex P1, and the smallest radius of curvature R2 (as the center of
curvature QC2) at the position away from the vertex P1. It is formed to change in
[0019]
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In FIG. 1 to FIG. 3, since the connecting line L1 is circular and the center C2 thereof is offset to
one side with respect to the center C1 of the outer shape of the diaphragm 1, the flat surface
portion 1a is more than one side. The area of the flat surface 1a1 on the other side is expanded
and enlarged. In the embodiment, one side is the vertex P1 side. Therefore, the rigidity of the flat
surface portion 1a of the diaphragm 1 is lower in the vicinity of the apex P3 and the apex P4
than in the vicinity of the apex P1. For this reason, deformation due to molding when the
diaphragm 1 is formed by injection molding is more likely to occur in the vicinity of the apexes
P3 and P4 than in the vicinity of the apex P1. Therefore, the diaphragm 1 of the embodiment has
ribs 1c1 to 1c6 extending in the flat surface portion 1a such that one end intersects with the
connecting line L1 and the other end extends from the one end toward the other end. ing. For
example, the ribs 1c1 to 1c6 extend such that one end side approaches the connection line L1 in
a direction substantially tangential to the connection line L1, and the rib 1c1 to 6c separates
from the connection line L1 from the one end side to the other end side. In addition, the ribs 1c1
to 1c6 may be provided in the flat surface portion 1a except for the vicinity of the vertex P1. The
ribs 1c1 to 1c6 are present in at least a region 1ak where the region of the same diameter as the
connecting line L1 in the flat surface portion 1a and inside the virtual circle L2 centered on the
center C1 intersects the region outside the connecting line L1. It is good to be provided in In FIG.
1, a part of the arc of the imaginary circle L2 is indicated by an alternate long and short dash
line.
[0020]
In FIG. 1A, the ribs 1c1 to 1c6 are formed on a straight line not passing through the center C1.
Specifically, the ribs 1c1 to 1c6 are formed in a straight line radially outward around the center
C1 in one direction. FIG. 1A shows an example of clockwise rotation. In addition, the ribs 1c1 to
1c6 are formed to protrude to the same side as the protrusion 1b. Further, the ribs 1c1 to 1c6
are positioned such that the end far from the center C1 is at the apex connecting the apexes of
the diaphragm 1 or the adjacent apex, and the end near the center C1 intersects or touches the
connecting line L1. It is considered to be a position. Specifically, the ribs 1c1 to 1c6 are provided
in the tangential direction of the connecting line L1 or on a straight line that intersects the
connecting line 1 at an angle close to the tangent. Thus, the ribs 1c1 to 1c6 are provided in the
tangential direction of the connecting line L1 or on a straight line intersecting at an angle close
to the tangent, and the ribs 1c1 to 1c6 are provided to extend on a straight line passing the
center C1. The deformation of the outer edge portion of the diaphragm 1 can be favorably
suppressed, as compared with the case where it is provided concentrically with respect to the
case C1 or the center C1. Further, the ribs 1c1 to 1c6 extend on one side divided by a straight
line passing the end closer to the connecting line L1 and the center C1 of the circle. When rib
1c3 in FIG. 1 is described as a representative, rib 1c3 extends to the left side of the left and right
areas divided by straight line L100 passing through end 1c3t closer to connecting line L1 and
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center c1 of the circle. doing.
[0021]
As shown in FIG. 1A, in the embodiment, one end of the ribs 1c1, 1c3 and 1c5 is located at the
apexes P2, P3 and P4, respectively, and the rib 1c2 has the apex P2 and the apex P3. One end of
the rib 1c4 is located at the middle point of the connecting side, and the rib 1c4 is located at the
middle point of the side connecting the vertex P3 and the vertex P4. In the rib 1c6, one end is
positioned at a point other than the middle point of the side connecting the vertex 4 and the
vertex 5. This is for the purpose of obtaining a good design balance by avoiding dense ribs in
terms of appearance quality.
[0022]
The diaphragm 1 has a flat surface portion 1a expanded by the center C2 being offset by Δd as
compared with the case where the projection 1b is provided such that the connection line L1 is
not offset and the center C2 is not offset. It is preferable that the extension region 1ak be formed
such that a rib is present. The extension area 1ak is an area between the flat surface portion 1a
and the imaginary circle L2 connecting line L1 as described above. In FIG. 1A, the expanded area
1ak is shown by the hatched area. In the embodiment, at least a part of the ribs 1c1 to 1c5
excluding the rib 1c6 is present in the expanded area 1ak. The diaphragm 1 is, for example, 0.3
mm in average thickness. The cross-sectional shape of the ribs 1c1 to 1c6 is, for example, a
rectangle, and as an example of its dimensions, the protruding height is 0.6 mm and the width is
0.35 mm.
[0023]
The gate type in injection molding is, for example, a side gate provided on the end face of the
outer portion 1gk. Then, after molding, a gate cut process is performed to adjust the outer shape
and obtain the diaphragm 1.
[0024]
It is possible to configure an electroacoustic transducer using one diaphragm 1 described above
and having the diaphragm 1 and one drive unit for driving the diaphragm 1.
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[0025]
<Spherical Shell Diaphragm and Electro-acoustic Transducer Using the Same> The spherical shell
diaphragm 50 and the electro-acoustic transducer 100 using the same will be described mainly
with reference to FIGS. 4 to 16.
[0026]
The spherical shell diaphragm 50 will be described with reference to FIGS. 4 to 6.
In the spherical shell diaphragm 50 of the embodiment, a plurality of diaphragms 1 are
connected to form a substantially spherical shell.
FIG. 4 is an external perspective view of the electro-acoustic transducer 100 using the spherical
shell diaphragm 50, and is a perspective view seen from an oblique position on the opposite side
of the support column 101. As shown in FIG. FIG. 5 is a perspective view of the electro-acoustic
transducer 100 as viewed from an oblique position on the support 101 side. In FIG. 5, illustration
of the ribs 1c1 to 1c6 is omitted. FIG. 6 is a schematic perspective view corresponding to FIG. 4,
in which only the outer shape of the spherical shell diaphragm 50 is shown by a solid line, and
the internal structure 80 is shown by a broken line.
[0027]
The outer shape of the diaphragm 1 of the embodiment is a regular pentagon, so a regular
dodecahedron can be formed by connecting the respective sides. The spherical shell diaphragm
50 has a regular dodecahedron-shaped portion in which the sides of the eleven diaphragms 1 are
connected to each other to open one surface. The spherical shell diaphragm 50 accommodates
therein a structure 80 having a plurality of drive units 20, and a pillar 101 coupled to the
structural body 80 extends from the open surface of the spherical shell diaphragm 50 to the
outside. The spherical shell diaphragm 50 is configured to have eleven diaphragms 1 and one
open surface is closed by the plate 2 (see FIG. 5). As shown in FIG. 5, the plate 2 has a hole 2 a
for inserting the support column 101, is formed in a regular pentagon, and is attached to a
predetermined position of the support column 101. The plate 2 is formed of aluminum in a plate
shape. The support 101 is formed of aluminum in a hollow annular shape.
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[0028]
The eleven diaphragms 1 and the plates 2 are connected to each other via the edge 3 (see FIG. 5).
[0029]
FIG. 7 is a perspective exploded view illustrating the structure 80. As shown in FIG.
The structure 80 has a base 81 formed in a regular dodecahedron shape having 12 base planes
80a of pentagons, and 11 driving units 20 attached to 11 of the 12 base planes 80a. Is
configured. In FIG. 7, one drive unit 20 is representatively shown. The drive unit 20 shows a state
just before being mounted on the base 81.
[0030]
The substrate 81 is formed in a substantially shell shape having a space inside by die-casting of
aluminum or the like. The base 81 may be formed solid. Openings 80b are formed in each base
surface 80a by cutting or the like, and are communicated with the internal space. At the vertex
where the three base surfaces 80a intersect, an air hole 80c is formed, which enables air flow
between the inside and the outside after the drive unit 20 is attached to the opening 80b. A hole
(not shown) is formed on the side of the base surface 80a on the bottom surface side in FIG. 7 of
the base body 80, and the support column 101 is fitted in the hole. The support 101 is fixed to
the base 80 by screws (not shown).
[0031]
The drive unit 20 is fixed to the base 81 by an adhesive or a screw (not shown) at a position
where the tip end 21 side of the housing 20k is inserted into the opening 80b and the step 26 of
the housing abuts on the base surface 80a. (See Figure 8). The drive unit 20 includes a magnetic
circuit (not shown) and a voice coil bobbin 24 reciprocally driven by the magnetic circuit. The
voice coil bobbin 24 protrudes so as to have a drive shaft CL 24 (shown in FIG. 8 at one location)
orthogonal to the base surface 80 a in a state where the drive unit 20 is fixed to the base 81. The
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tip end of the voice coil bobbin 24 is fixed to the back surface side of the annular portion 1k of
each diaphragm 1 of the spherical shell diaphragm 50 (opposite to the side where the projecting
portion 1b protrudes). A signal line (not shown) for supplying an audio signal to each drive unit
20 is externally passed through the inside of the support column 101 and further connected to
each drive unit through the inside of the base 81.
[0032]
Next, a process of forming the spherical shell diaphragm 50 using the diaphragm 1 and
integrating it with the structure 80 will be described.
[0033]
The top view and sectional drawing (S9-S9) of edge 3 are shown in FIG.
The edge 3 is formed in a regular pentagonal annular shape corresponding to the outer shape of
the diaphragm 1, and has a U shape in cross section and a U shape 3a formed in a regular
pentagon along the outer shape; The U-shaped portion 3a is formed to include a margin portion
3b extending in a bowl shape and a flange portion 3c extending outward from the U-shaped
portion 3a. As a material of the edge 3, polyisobutylene rubber (IIR), acrylonitrile butadiene
rubber (NBR), etc. can be used. The diaphragm 1 is bonded to the surface 1n [see FIG. 1 (b)] on
the side on which the ribs 1c1 to 1c6 are not formed on one surface side (the front side in the
plan view of FIG. 9 in the embodiment) of the margin 3b. It is fixed by agent adh1 (see also FIG.
12). The closer to the center, the thicker the thickened portion 3b, which makes it less likely that
a deviation in strength will occur when the diaphragm 1 is fixed to the diaphragm 1.
[0034]
Such edge 3 is fixed to each of the eleven diaphragms 1. Next, as shown in FIG. 10, on each side
of one of the diaphragms 1 with edges 3 (indicated by reference numeral 1A), each side of five
diaphragms with diaphragm 3 (indicated by reference numerals 1B1 to 1B5) is bonded Fix by the
agent. At this time, with regard to the diaphragms 1B1 to 1B5, the apex P1 is not connected to
the diaphragm 1A, and is set to be at the head position around one direction (for example, the
Rt1 direction in FIG. 10). The vertex P1 is a vertex on the side where the connecting line L1 is
biased. Specifically, in FIG. 10, the apexes P1 of the diaphragms 1B1 to 1B5 are positioned at the
top of the diaphragm 1A in the counterclockwise direction. The sides of the diaphragm 1 with the
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edge 3 (indicated by reference numerals 1C1 to 1C5) are fixed to the sides of the diaphragms
1B1 to 1B5 not including the apex P1 on the side far from the diaphragm 1A with an adhesive.
At this time, with regard to the diaphragms 1C1 to 1C5, the apex P1 is not connected to the
diaphragm 1B, and is set to be at the head position around one direction (for example, the Rt2
direction in FIG. 10). Specifically, in FIG. 10, the apexes P1 of the diaphragms 1C1 to 1C5 are
positioned at the top of the diaphragm 1A in the clockwise direction.
[0035]
When the eleven diaphragms 1 are formed to have one diaphragm 1A and five arm-like portions
extending from each side as shown in FIG. 10, the tip of the eleven voice coil bobbins 24 in the
structure 80 is formed. An adhesive is applied to the diaphragm 1A, and the diaphragm 1A is
placed on the voice coil bobbin 24 of the drive unit 20 on the opposite side of the support
column 101 of the structure 80, and the diaphragms 1B1 to 1B5 and the diaphragms 1C1 to 1C5
are voice coil bobbins of each drive Align them in the circumferential direction so as to
correspond to 24 and fix them together. Specifically, as shown in FIG. 2, the tip of the voice coil
24 and the wall on the back side of the annular portion 1 k of each diaphragm 1 are fixed by an
adhesive. Further, the edges 3 of the adjacent diaphragms 1 are fixed with an adhesive.
Specifically, the flanges 3c of the edge 3 are fixed to each other with an adhesive.
[0036]
A cross-sectional view of such a state in which the diaphragms 1 are fixed to each other via the
edge 3 is shown in FIG. In FIG. 12, an adhesive for bonding the edges 3 is denoted by reference
numeral 4.
[0037]
As for the diaphragms 1C1 to 1C5, in addition to adhering to the diaphragms 1B1 to 1B5, the
sides of the edge 3 corresponding to the plate 2 and the sides of the plate 2 are similarly adhered
with an adhesive.
[0038]
Adhesives adh 1 and 4 can be used for general purpose products.
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It is not limited whether the adhesive has flexibility after curing. Through the above-described
steps, the spherical shell diaphragm 50 is formed by the diaphragm 1 and integrated with the
structure 80, whereby the electroacoustic transducer 100 is manufactured.
[0039]
FIG. 11 is a side view of the electroacoustic transducer 100. FIG. In FIG. 11, the electro-acoustic
transducer 100 is configured of a diaphragm 1A disposed on the top surface, diaphragms 1B5
and 1B1 of the diaphragms 1B1 to 1B5 connected to the diaphragm 1A, and diaphragms 1B5
and 1B1. The diaphragms 1C4, 1C5, and 1C1 in the diaphragms connected to are shown in a
direction in which they are visually recognized.
[0040]
A boundary line RL in which the diaphragms 1B1 to 1B5 and the diaphragms 1C1 to 1C5 are
connected divides the spherical shell diaphragm 50 into upper and lower portions in FIG. 11 in a
zigzag shape. The spherical shell diaphragms 50 are formed such that the positions of the apexes
P1 of the diaphragms 1 in the upper and lower sides of the boundary line RL in FIG. Specifically,
on the upper side of the boundary line RL, the direction of each diaphragm 1B1 to 1B5 is set so
that the vertex P1 is located on the right side of FIG. 11, and on the lower side, the vertex P1 is
on the left side of FIG. The directions of the diaphragms 1C1 to 1C5 are set to be positioned.
[0041]
Thereby, in the electro-acoustic transducer 100, the sound pressure fluctuation in the vertical
direction in FIG. 11 is averaged, and a good reproduced sound can be obtained regardless of the
listening position. The diaphragms 1B1 to 1B5 are connected on the upper side of the boundary
line RL, and the diaphragms 1C1 to 1C5 are connected on the lower side of the flat surface 1a on
the side provided with the ribs 1c1 to 1c6 and the side not provided. There is. That is, the sides
on which the ribs 1c1 to 1c6 are not provided are not connected. As a result, the rigidity of the
spherical shell diaphragm 50 is uniformly improved, and the divided vibration is further
suppressed, so that a better reproduced sound can be obtained.
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[0042]
The rigidity improvement of the diaphragm 1 contributing to the rigidity improvement of the
spherical shell diaphragm 50 will be described based on measured data with reference to FIGS.
13 (a) to 13 (c) and FIG. 13 (b) is a plan view of the diaphragm 1, and FIG. 13 (a) is a plan view of
a diaphragm 200 as a comparative example in which the ribs 1c1 to 1c6 in the diaphragm 1 are
removed. c) is a top view which shows the diaphragm 201 of the shape which added the ribs
201c7-201c10 to the diaphragm 1. FIG. Specifically, the ribs have ribs 201c1 to 201c6
corresponding to the ribs 1c1 to 1c6 in the diaphragm 1, and further, ribs 201c7 to 201c10. The
diaphragm 201 is a modification of the diaphragm 1 of the embodiment. Hereinafter, the
diaphragms 200 and 1, 201 shown in FIGS. 13 (a) to 13 (c) are also referred to as "without rib",
"with partial rib" and "with circumferential rib" for convenience.
[0043]
Of the ribs 201 c 1 to 201 c 10 of the diaphragm 201, the ribs 201 c 1 to 201 c 5 are provided
in the same manner as the ribs 1 c 1 to 1 c 6 of the diaphragm 1. The ribs 201c7 to 201c10
extend from the flat surface portion 1a to 201c1 to 201c6 as ribs extending such that one end
approaches the connecting line L1 in a direction substantially tangential to the connecting line
L1 and moves away from the connecting line L1 from one end to the other end. It protrudes in
the same side and is formed. In each of the ribs 201c7 to 201c10, the end far from the center C1
is located at the apex connecting the apexes of the diaphragm 1 or the adjacent apexes, and the
end closer to the center C1 intersects or contacts the connecting line L1 It is assumed.
Specifically, the ribs 201c7 to 201c10 are provided in the tangential direction of the connecting
line L1 or on a straight line that intersects the connecting line 1 at an angle close to the tangent.
Ribs 201c7 and 201c9 have one end located at vertices P5 and P1, respectively, and rib 201c8
has one end located at the middle point of the side connecting vertex P5 and vertex P1, and rib
201c10 has a vertex P1 One end is located at the middle point of the side connecting the two
points and the vertex P2. One end of the rib 201 c 6 is positioned at a point other than the
middle point of the side connecting the vertex 4 and the vertex 5. This is for the purpose of
obtaining a good design balance by avoiding dense ribs in terms of appearance quality. In the
diaphragm 201, ribs 201c1 to 201c10 are provided on the flat surface portion 1a so as to cover
substantially the entire circumference including the vicinity of the vertex P1.
[0044]
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15
The mode frequency (Hz) of each of the diaphragms 200 1 and 201 is measured with respect to
the mode orders 1 to 6 and the mode frequency of the diaphragm 200 without ribs as a basis for
that rib mode, that is, partial Table 1 shows the results in which the shift amount (increase or
decrease) of the mode frequency is shown as a percentage for the diaphragm 1 with ribs and the
diaphragm 201 with ribs around the entire circumference. In Table 1, the case where the mode
frequency is shifted to the higher side is indicated by plus, and the case where the mode
frequency is shifted to the lower side is indicated by minus. FIG. 14 is a graph of the shift
amounts shown in Table 1.
[0045]
As is apparent from FIGS. 13 (a) to 13 (c) and FIG. 14, the diaphragm 1, 201 provided with ribs
has a remarkable tendency to move to the higher mode frequency with respect to the diaphragm
200 without ribs. It is. Specifically, clear high-frequency shifts are seen at mode orders 1, 2, 4,
and 5. A large shift amount of 10% or more is obtained in the mode orders 1, 2 and 5. The mode
order and the shift amount at which the shift occurs are substantially the same regardless of the
difference in rib form.
[0046]
In general, when the rigidity of the diaphragm increases, the mode frequency shifts to the higher
side, so the diaphragm 1 (with some ribs) and the diaphragm 201 (with all the circumferential
ribs) are better than the diaphragm 200 (without ribs). However, it can be seen that the rigidity is
high. In the diaphragm 1 (with partial ribs) and the diaphragm 201 (with circumferential ribs),
the shift amount of the mode frequency is substantially the same, and the value of the mode
frequency is also substantially the same. That is, the rigidity of the diaphragm 1 and the
diaphragm 201 is substantially the same. Therefore, the diaphragm 1 having less ribs and
smaller mass than the diaphragm 201 has a faster response when driven by the same drive
circuit, and better reproduced sound can be obtained. The specific mass example at the time of
shape | molding each diaphragm with PP resin is as follows. Diaphragm 200 (without ribs):
0.6825 g Diaphragm 1 (with partial ribs): 0.7158 g Diaphragm 201 (with all circumferential
ribs): 0.7347 g Therefore, to obtain the same rigidity as a diaphragm, In the mass of the
diaphragm 1 with a rib, rather than the diaphragm 201 with a circumferential rib, in mass,
(0.7347-0.7158) /0.7347 = 25.72 x 10 < Only -3>, that is, about 2.6% can be reduced in weight.
12-05-2019
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[0047]
It goes without saying that the embodiments of the present invention are not limited to the
above-described configurations and procedures, and may be modified within the scope of the
present invention.
[0048]
The ribs 1c1 to 1c6 of the diaphragm 1 and the ribs 201c7 to 201c10 of the diaphragm 201 can
be variously modified.
Some variations are schematically illustrated in FIGS. 15 (a) -15 (c). In these examples, although
the ribs 1c1 to 1c6 of the diaphragm 1 will be described as a representative, they can be
similarly applied to the ribs 201c1 to 201c10 of the diaphragm 201. FIG. 15A shows an example
in which the ribs 11a are formed in a curved shape instead of a linear shape. In this example, the
center of curvature of each rib 11a is on the same side with respect to each rib 11a. FIG. 15 (b) is
an example in which both of the rib 11b1 in the counterclockwise direction and the rib 11b2 in
the right direction are provided in the radial direction with respect to the center Co of the rib
11b. FIG.15 (c) is the example which divided and formed the rib in which the rotation direction in
FIG.15 (b) differs in each of the surface and back surface of the diaphragm 1. FIG.
[0049]
According to the above-described embodiment and its modification, since the ribs 1c1 to 1c6, the
ribs 201c to 201c10, or the ribs 11a to 11b are provided, the warpage of the diaphragm 1 due to
the injection molding is suppressed, and the spherical shell The molding defect rate of the
diaphragm 1 which can not be adopted for the diaphragm 50 is significantly reduced. By
providing the ribs 1c1 to 1c6, the ribs 201c1 to 201c10, or the ribs 11a to 11b, as shown in FIG.
1A, the diaphragm 1 has an asymmetrical shape on the left and right sides. Uniformization can
be promoted, and the occurrence of remarkable resonance peaks and dips in acoustic
characteristics can be suppressed. In terms of sound quality, even if a signal with a large
amplitude is input, the occurrence of the jumping phenomenon of the spherical shell diaphragm
50 is suppressed, and no abnormal noise occurs. Since the rigidity of the flat surface portion 1a
is increased by providing the ribs 1c1 to 1c6, the ribs 201c1 to 201c10, or the ribs 11a to 11b,
divided vibrations of the flat surface portion 1a are significantly reduced, and good quality
reproduction sound with less distortion Is obtained. Further, by providing the ribs 1c1 to 1c6, the
ribs 201c1 to 201c10, or the ribs 11a to 11b, the rigidity of the diaphragm 1 is uniform in the
12-05-2019
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circumferential direction. Therefore, when an electroacoustic transducer is formed using one
diaphragm 1 provided with each rib and including the diaphragm 1 and one drive unit for driving
the diaphragm 1, for example, listening on the central axis of the diaphragm 1 The reproduced
sound has a very small difference in sound quality due to the direction (posture) around the
central axis of the diaphragm 1. Therefore, in the electroacoustic transducer 100 using the
spherical shell diaphragm 50 formed of the diaphragm 1 provided with the ribs 1c1 to 1c6, the
ribs 201c1 to 201c10, or the ribs 11a to 11b, the whole radiated sound is made more uniform.
Good acoustic characteristics are obtained.
[0050]
An example of the dimensions of the diaphragm 1 of the embodiment is shown in FIG. In FIG. 16,
the area of the protrusion 1b is hatched in the plan view. The dimensions of the diaphragm 1 are
not limited to those shown in FIG. If the element diaphragm is a regular polygon other than a
regular pentagon, it may not be able to be formed into a substantially spherical shell unless the
sides of the adjacent diaphragms are connected separately. In that case, the shape of the edge
can be formed into a spherical shell shape by making the edge a shape that forms a part of a
substantially spherical shell surface and the edge filling a gap between the element diaphragms.
[0051]
The cross-sectional shapes of the ribs 1c1 to 1c6, 201c1 to 201c10, and 11a to 11b are not
limited to the rectangles of the embodiment. It may have various cross-sectional shapes such as a
triangle, a semicircle, a semiellipse and the like. When the height is larger than the plate
thickness, the deformation suppressing effect of the diaphragm 1 becomes larger. By providing
the ribs 1c1 to 1c6, the ribs 201c1 to 201c10, or the ribs 11a to 11b, a change in timbre when
the plate thickness of the diaphragm 1 itself is different or when the material is different can be
reduced.
[0052]
Ribs may also be provided on the projection 1b. In this case, since the projecting portion 1b is a
portion projecting like a petals of morning glory, the rigidity is higher than that of the flat surface
portion 1a without providing a rib, so the rigidity of the projecting portion 1b is more due to the
rib provided on the projecting portion 1b. Get higher. Therefore, the difference in rigidity
12-05-2019
18
between the flat surface portion 1a provided with the rib and the protruding portion 1b provided
with the rib is not significantly reduced. On the other hand, when the rib is not provided in the
projecting portion 1 b and the rib is provided only in the flat surface portion 1 a, the rigidity
difference between the projecting portion 1 b and the flat surface portion 1 a is reduced by
improving the rigidity of the flat surface portion 1 a. It is more desirable because the stiffness
balance is improved.
[0053]
As described above, the diaphragm 1 is expanded by the center C2 being offset by Δd as
compared with the case where the protrusion 1b is provided such that the connecting line L1
matches the center C1 without the center C2 being offset. It is preferable that the rib is formed
so as to always exist in the expanded area 1ak of the flat surface portion 1a. In this case, the end
on the center C1 side of the ribs 1c1 to 1c5 may not necessarily be located on the connection
line L1, and may be located on, for example, the flat surface portion 1a.
[0054]
1, 11, 201 diaphragm (element diaphragm) 1a flat surface portion 1ak extended region 1a1 flat
surface 1b projecting portion 1b1 projecting end surface 1b2 circumferential surface 1b3
recessed portion 1c1 to 1c6, 201c1 to 201c10, 11a, 11b1, 11b2 rib 1gk outer portion 1k
Annular part 1s inclined part 1s1 curved surface 2 plate 2a hole 3 edge 3a U-shaped part 3b
flanged part 3c flanged part 4 adhesive 20 drive part 24 voice coil bobbin 50 spherical shell
diaphragm 80 structure 80a base 80a opening 81 base 100 electricity Acoustic transducer 101
pillar L1 connecting line P1 to P5 vertex φL1 (of connecting line) diameter C1, C2 center CL24
drive axis LC1, LC2 central axis R1, R2 radius of curvature
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