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JP2008085842

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DESCRIPTION JP2008085842
[Problem] A manufacturing method for obtaining a natural sound and high appearance quality by
wood, as well as securing a flat characteristic in which a sound pressure dip is suppressed from
mid range to high range, and improving frequency characteristics of high range Provide a way.
SOLUTION: A step of bonding a reinforcing sheet 24 to one side of a wood sheet 23 made of
natural wood to make a bonding sheet 29, a step of impregnating the bonding sheet 29 with a
thermosetting resin 31, and impregnating After drying of the thermosetting resin 31, the bonded
sheet 29 processed to a size to form the substantially dome-shaped central vibration portion 19
and the end portion of the edge portion 21b are molded over the entire outer periphery of the
central vibration portion 19. A first plate including the entire central vibrating portion 19 by
laminating and fixing the synthetic resin film 25 to be the substantially dome-shaped outer
peripheral vibrating portion 21 fixed to the frame 13 accommodating the magnetic circuit 9 by
heat press molding; The diaphragm 11 is formed into the thickness area D and the second
thickness area D-1 thinner than the outer peripheral vibration portion 21. [Selected figure]
Figure 3
Method of manufacturing diaphragm for electroacoustic transducer
[0001]
The present invention relates to a method of manufacturing a diaphragm for an electroacoustic
transducer suitable for a headphone or the like.
[0002]
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1
In recent years, one using natural wood as a material of a diaphragm is known.
The reason for using wood as the material of the diaphragm is, as shown in FIG. 8, a sound
velocity faster than paper, metal or resin, large internal loss, large rigidity, large Young's
modulus, small density (light), etc. In addition to the point that it has overall excellent
characteristics, it is that the natural sound that a tree originally has is obtained. In addition, it can
be improved in appearance and has an effect of giving high quality, and is attracting attention as
one of diaphragm materials.
[0003]
By the way, in the case of reproducing the sound over a wide band from the low range to the
high range, for example, as shown in FIG. 9, the outer periphery integrally arranged continuously
on the outer periphery of the dome-shaped central vibrating portion 101 and the central
vibrating portion 101 The combination of the central vibration part 101 and the outer
circumference vibration part 103 covers the entire range from the low tone range to the high
tone range.
[0004]
A general frequency response (output sound pressure frequency characteristic) at this time is
shown in FIG.
[0005]
The frequency response shown in FIG. 10 is obtained by automatically measuring the sound
pressure level at a point of 1 m on the reference axis so as to form a continuous curve
corresponding to the frequency.
In this frequency response, the frequency range to be reproduced is called the effective
frequency band FB, and the output sound pressure level is in the range of the low band
resonance frequency fo indicating the low band limit and the high band resonance frequency fh
indicating the high band limit. The frequency range of the low band reproduction limit L and the
high band reproduction limit H in which -10 dB is reduced is shown.
The characteristic is divided into a flat characteristic of the piston vibration area PB and a divided
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vibration area DB comprised of a complex vibration area of the diaphragm. In the whole band
type, the whole of the effective frequency band FB from the low band reproduction limit L to the
high band reproduction limit H is used.
[0006]
In this case, the frequency characteristic of the output sound pressure is substantially flat in the
low frequency region because the piston vibration region PB vibrates with the edge portion 105
as a fulcrum. In the mid-tone range, influences appear at the edge portion 105 around the
diaphragm and at the connecting portion that is the boundary between the central vibrating
portion 101 and the outer circumferential vibrating portion 103, and vibrations of opposite
phases (FIG. 9, a, b) occur due to resonance. Sound cancels each other, resulting in a dip called
midtone valley d. In the high frequency range, the diaphragm can not vibrate in the piston, and a
divided vibration area DB in which each portion of the diaphragm vibrates in a complicated
manner causes many peak dips to occur. At the high frequency limit, high frequency resonance
occurs mainly at the frequency determined by the stiffness and mass of the central part of the
diaphragm and the mass of the voice coil 107, and the peak at this high frequency limit
frequency (high frequency reproduction limit H) is finally Sound pressure drops sharply.
[0007]
As means for solving these problems, for example, in order to expand the high sound range, for
example, using a diaphragm material having an acoustic loss characteristic of 0.02 or more as in
Patent Document 1, 20 kHz using the division vibration of the diaphragm Means for enabling the
reproduction of the above frequency band, or means for suppressing the anti-phase vibration of
the edge portion in the midrange by using an elastic member for fixing and supporting the edge
portion as in Patent Document 2 and reducing the dip d It has been known. JP, 2002-152885, A
JP, 2005-204215, A
[0008]
As described above, in the full band type diaphragm, problems occur in particular from the mid
band to the high band, but in the former means for improving the mid band, the acoustic loss
characteristic is 0 No special consideration is given to the necessity of using special materials of
.02 or more, and the point of aiming to improve the appearance quality as well as the problem
that can not be greatly connected to the improvement of the range other than the high range.
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[0009]
On the other hand, in the latter means of supporting the edge portion with an elastic member,
while the vibration characteristics of the edge portion can be improved, it does not lead to the
improvement of the reverse phase occurring at the boundary between the central vibration
portion and the outer peripheral vibration portion. No consideration is given to improving the
appearance quality as well as the problems from the tone range to the high tone range.
[0010]
Therefore, in the present invention, a vibration for an electro-acoustic transducer having an
excellent appearance quality in which natural sounding originally possessed by wood can be
obtained and sound quality improvement of the sound range from the middle range to the high
range can be achieved. The purpose is to provide a method of manufacturing a plate.
[0011]
In order to achieve the above object, according to the present invention, first, a laminated sheet
in which a reinforcing sheet is laminated on one side of a wood sheet made of natural wood is
dipped into a solution and impregnated with a thermosetting resin. And drying and curing the
impregnated thermosetting resin, forming a bonded sheet to be a substantially dome-shaped
central vibrating portion processed to a predetermined size, and forming the substantially dome
over the entire outer periphery of the central vibrating portion And a step of laminating and
fixing the synthetic resin film to be an outer peripheral vibration portion of the shape by heat
press molding to form a diaphragm, wherein the diaphragm has a first thickness region including
the entire central vibration portion and the outer peripheral vibration portion And a second plate
thickness region thinner than the first plate thickness region including the edge portion of the
second plate thickness region.
[0012]
Second, a step of immersing a laminated sheet in which a reinforcing sheet is laminated on one
side of a wood sheet made of natural wood into a solution to impregnate the thermosetting resin,
drying and curing the impregnated thermosetting resin Heating press-molding the bonded sheet
to a predetermined shape so as to form a predetermined substantially dome-shaped central
vibration portion; finishing the bonded sheet formed into the substantially dome-shaped central
vibration portion; and the central vibration portion And a step of laminating and bonding a
synthetic resin film formed on a substantially dome-shaped outer peripheral vibrating portion
provided over the entire outer circumference of the outer portion through an adhesive to form a
vibrating plate, the vibrating plate includes the entire central vibrating portion And a second
plate thickness area including the edge portion of the outer peripheral vibration portion and a
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plate thickness thinner than the first plate thickness area.
[0013]
Third, a step of immersing a laminated sheet in which a reinforcing sheet is laminated on one
side of a wood sheet made of natural wood into a solution to impregnate the thermosetting resin,
drying and hardening the impregnated thermosetting resin A step of heat-pressing the laminated
sheet into a provisionally dome-shaped central vibration portion, and thinning the reinforcing
sheet of the laminated sheet of the provisional central vibration portion by a thickness adjusting
means, and finishing the sheet Forming a predetermined substantially dome-shaped central
vibration portion, a bonded sheet formed in the predetermined substantially dome-shaped central
vibration portion, and a substantially dome-shaped outer peripheral vibration portion provided
over the entire outer circumference of the central vibration portion And a step of laminating and
bonding the molded synthetic resin film through an adhesive to form a diaphragm, wherein the
diaphragm has a first thickness region including the entire central vibrating portion and the
outer peripheral vibrating portion And a second plate thickness region thinner than the first plate
thickness region including the edge portion of the second plate thickness region.
[0014]
Fourth, a step of immersing at least one of a wood sheet made of natural wood and a reinforcing
sheet to be bonded to one side of the wood sheet into a solution and impregnating the solution
with the thermosetting resin, a wood sheet and a reinforcing sheet After drying and curing the
sheet impregnated with the thermosetting resin, laminating the wooden sheet and the reinforcing
sheet on the laminated sheet by heat press molding to form a temporary approximately domeshaped central vibration portion; A step of forming a predetermined substantially dome-shaped
central vibration portion by finishing means; a bonded sheet formed in the predetermined
substantially dome-shaped central vibration portion; and a substantially dome shape provided
over the entire outer periphery of the central vibration portion And laminating and bonding the
synthetic resin film formed on the outer peripheral vibration portion through an adhesive to
form a diaphragm, wherein the diaphragm has a first thickness region including the entire
central vibration portion. It is characterized in that the region and the edge portion of the outer
peripheral vibration portion are formed into a second plate thickness region thinner than the
first plate thickness region.
[0015]
Fifth, a step of immersing a laminated sheet in which a reinforcing sheet is laminated on one side
of a wood sheet made of natural wood into a solution to impregnate the thermosetting resin,
drying and hardening the impregnated thermosetting resin After that, the laminated sheet to be a
substantially dome-shaped central vibrating portion processed into a predetermined size, and the
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synthetic resin film to be substantially circumferentially molded to a substantially dome-shaped
peripheral vibrating portion are molded over the entire outer periphery of the central vibrating
portion. And the step of forming the diaphragm as a diaphragm, wherein the diaphragm includes
a first thickness region including a central portion of the central vibration portion, and an edge
portion of the outer peripheral vibration portion. A third thickness region including a second
thickness region thinner than the thickness region and a connection portion between the central
vibration portion and the outer peripheral vibration portion and having a thickness greater than
the first thickness region And are formed into
[0016]
Sixth, a step of immersing at least one of a wood sheet made of natural wood and a reinforcing
sheet to be bonded to one side of the wood sheet into a solution and impregnating the solution
with the thermosetting resin, a wood sheet and a reinforcing sheet After drying and curing the
sheet impregnated with the thermosetting resin, laminating the wooden sheet and the reinforcing
sheet on the laminated sheet by heat press molding to form a temporary approximately domeshaped central vibration portion; A step of forming a predetermined substantially dome-shaped
central vibration portion by finishing means; a bonded sheet formed in the predetermined
substantially dome-shaped central vibration portion; and a substantially dome shape provided
over the entire outer periphery of the central vibration portion And laminating and bonding the
synthetic resin film formed on the outer peripheral vibration portion through an adhesive to
form a diaphragm, wherein the diaphragm includes a central portion of the central vibration
portion. A second thickness region including the thickness region of 1 and an edge portion of the
outer peripheral vibration portion and having a thickness smaller than the first thickness region,
and a connection portion between the central vibration portion and the outer peripheral
vibration portion And a third plate thickness area having a thickness greater than that of the first
thickness area.
[0017]
And as a preferred embodiment, the adhesive used is of the nature that doubles as a moisture
proof agent that prevents the absorption of water.
[0018]
In addition, a mold release film for separating from the mold is provided in the mold for heat
press molding after press molding is completed.
[0019]
According to the first aspect of the present invention, it is possible to obtain a natural sound that
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a wood originally has and to obtain a diaphragm having an improved appearance by using a
wood sheet made of natural wood.
[0020]
On the other hand, the diaphragm becomes a piston vibration area that vibrates integrally with a
thin sheet as a fulcrum, and can make the frequency characteristic of the output sound pressure
flat.
[0021]
In particular, in the portion connecting the central vibration portion and the outer peripheral
vibration portion, the vibration of the antiphase due to resonance is suppressed to a small level
by the laminated sheet structure with a thick plate thickness, and the sound pressure dip can be
improved.
In addition, even in the high-pitched range, the complicated split vibration of the diaphragm can
be suppressed to a smaller value and the peak dip can be improved by the laminated sheet
structure having a thick plate thickness.
[0022]
According to the second aspect of the present invention, it is possible to make a diaphragm
provided with a substantially dome-shaped central vibrating portion with high processing
accuracy in addition to the first effect.
[0023]
According to the third aspect of the present invention, in addition to the first effect, the
movement is lightened by the weight reduction of the entire diaphragm, and the high frequency
range of the large movement amount follows unavoidably with the frequency characteristic of
the high frequency range. It is possible to improve.
[0024]
According to the fourth aspect of the present invention, in addition to the first effect, it becomes
possible to perform heat press molding with a thin wooden sheet and a reinforcing sheet, so that
the movement is lightened by the weight reduction of the entire diaphragm, It is possible to
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follow the treble band with a large amount of movement without difficulty, to improve the
frequency characteristic of the treble band, and to suppress the deformation amount of the
laminated sheet to a small value.
[0025]
According to the fifth aspect of the present invention, in addition to the first effect, due to the
elimination of a part of the synthetic resin film applied to the central vibration part, the weight is
reduced and the movement is improved, and the high sound range with a large amount of
movement Accordingly, the frequency characteristic of the high range can be improved by
following without difficulty.
[0026]
According to the sixth aspect of the present invention, in addition to the first effect, due to the
elimination of a portion of the synthetic resin film applied to the central vibration portion, the
movement is lightened by becoming lighter, and a high sound range with a large amount of
movement. Accordingly, the frequency characteristic of the high range can be improved by
following without difficulty.
[0027]
Hereinafter, embodiments of the present invention will be specifically described with reference to
the drawings of FIGS. 1 to 7.
[0028]
FIG. 1 is a schematic cross-sectional view of an electroacoustic transducer according to the
present invention.
[0029]
The electroacoustic transducer 1 has a magnetic circuit 9 composed of a magnetic pole (yoke) 3,
a central pole 5 and a magnet 7, and a diaphragm 11 disposed above the magnetic circuit 9.
[0030]
The magnetic pole 3, the central pole 5 and the magnet 7 constituting the magnetic circuit 9 are
engaged with the columnar projections 17 rising from the recess 15 of the frame 13 and have a
predetermined gap G between the magnetic pole 3 and the central pole 5. It is housed and
arranged in the recess 15.
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[0031]
The diaphragm 11 has a central vibrating portion 19 having a dome-shaped cross section and an
outer peripheral vibrating portion 21 integrally formed continuously on the outer periphery of
the central vibrating portion 19, from the central vibrating portion 19 to the outer peripheral
vibrating portion 21. The voice coil 22 is attached to the back surface which will be the
connection site 20 that follows the center of the gap G by dropping into the gap G while being
bonded and supported via an adhesive while the outer peripheral vibrating portion 21 is the
same as the central vibrating portion 19. The peripheral edge P of the edge portion 21b
consisting of the thick plate portion 21a and the edge portion 21b of a thinner plate thickness
has a supporting structure adhered to the outer peripheral edge of the frame 13 by an adhesive
means such as an adhesive. There is.
[0032]
The thick plate thickness region D has a three-layer shape in which the synthetic resin film 25 is
superimposed on a laminated sheet in which the wood sheet 23 made of natural wood and the
reinforcing sheet 24 are laminated, and vibration of opposite phase in the midrange is The
thickness α is set to be small and to suppress complicated division vibration in the high range.
Further, the thin plate thickness region D-1 to be the edge portion 21b has a shape of only the
synthetic resin film 25, and is set to a thickness β in which the entire diaphragm 11 becomes a
piston vibration region.
[0033]
The wood sheet 23 is made by, for example, lapping from a log-shaped wood 27 as shown in FIG.
[0034]
Natural wood used is a material that satisfies the conditions such as ease of forming and acoustic
characteristics, in addition to conditions such as uniform and small conduit density, short
conduit, long wood fiber, slow summer growth, etc. Birch materials such as birch and maple
materials such as hard maple are used.
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[0035]
As the reinforcing sheet 24, a sheet having high heat resistance and high mechanical strength
such as tension is used, and in this case, non-woven fabric of vinylon and valve mixed element is
used.
Also, natural materials such as Gampi paper and Kozo paper are used.
[0036]
Next, a first method of manufacturing the diaphragm 11 will be described based on FIG.
[0037]
First, the wooden sheet 23 is replated from the log-shaped wood 27 (1-a).
A reinforcing sheet 24 is bonded to one surface of the wood sheet 23 which has been replated to
form a bonded sheet 29 (1-b).
Next, the laminated sheet 29 is dipped into a solution tank 33 containing a thermosetting resin
31 such as a phenol solution to impregnate the thermosetting resin 31 (1-c).
Next, the laminated sheet 29 is taken out of the solution tank 33 and dried, and then it is
punched into a size D to form a substantially dome-shaped central vibrating portion 19 (1-d).
A substantially dome-shaped outer-peripheral vibrating portion 21 in which an end portion of an
edge portion 21b formed over the entire outer periphery of the central vibrating portion 19 is
fixed to a frame 13 accommodating the magnetic circuit 9 The resultant synthetic resin film 25 is
set in a mold consisting of a male mold 37 and a female mold 39 provided with a heater 35, and
is heat-pressed (1-e).
After the heat press molding, the temporary diaphragm is taken out of the mold (1-f).
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At this time, it is desirable to provide a heat-resistant mold release film 41 for separation so that
it can be taken out of the mold quickly as indicated by a two-dot chain line in the mold.
In this case, although it is best to provide both of the male mold 37 and the female mold 39,
either one may be provided.
Next, the outer periphery of the synthetic resin film 25 is cut as indicated by the arrow with
respect to the temporary diaphragm (1-f) taken out of the mold, so that the first thickness region
D including the entire central vibration portion 19 and It is possible to obtain the normal
diaphragm 11 formed into the second thickness region D-1 including the edge portion 21b of the
outer peripheral vibration portion 21 and having a thickness smaller than the first thickness
region D. (1-g).
[0038]
FIG. 4 shows a second method of manufacturing the diaphragm 11.
[0039]
The manufacturing method of FIG. 4 is characterized in that the bonding sheet 29 and the
synthetic resin film 25 are laminated and bonded using an adhesive.
[0040]
That is, the wooden sheet 23 is replated from the log-shaped wood 27 (2-a).
A reinforcing sheet 24 is bonded to one surface of the wood sheet 23 which has been replated to
form a bonded sheet 29 (2-a-b).
Next, the bonding sheet 29 is dipped in a solution tank 33 containing a thermosetting resin 31
such as a phenol solution to impregnate the thermosetting resin 31 (2-c).
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Next, the laminated sheet 29 is taken out of the solution tank 33 and dried, and then set in a
mold consisting of a male mold 37 and a female mold 39 provided with a heater 35 and
subjected to heat press molding (2-e).
The first plate thickness region D with high processing accuracy can be obtained by cutting the
outer periphery of the substantially dome-shaped temporary central vibration portion taken out
of the mold after the heat press molding with a finishing means (not shown) 2-f).
Next, a frame in which the magnetic circuit 9 is housed with the end portion of the edge portion
21 b formed over the entire outer periphery of the bonded sheet 29 formed in the regular
approximately dome-shaped central vibration portion 19 and the central vibration portion 19 By
laminating and bonding the synthetic resin film 25 formed in the substantially dome-shaped
outer peripheral vibration portion 21 fixed to 13 through the adhesive 43 (shown by the drawing
points and points), for example, by heat compression bonding or pressure bonding, A second
thickness region D− including a first thickness region D including the entire central vibration
portion 19 and the edge portion 21 b of the outer peripheral vibration portion 21 and having a
thickness smaller than the first thickness region D The diaphragm 11 with high processing
accuracy, which is formed into 1 and 2, is obtained (2-g).
[0041]
The adhesive 43 used in this embodiment may use a urethane-based moistureproof agent.
This makes it possible to simultaneously obtain the adhesive function while preventing
deformation due to moisture absorption.
[0042]
FIG. 5 shows a third method of manufacturing the diaphragm 11.
The manufacturing method of FIG. 5 is characterized in that the weight characteristics of the
diaphragm 11 can be reduced to follow the movement of the high range without difficulty,
thereby improving the frequency characteristics of the high range.
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12
[0043]
That is, the wooden sheet 23 is replated from the log-shaped wood 27 (3-a).
A reinforcing sheet 24 is bonded to one surface of the wooden sheet 23 that has been replated to
form a bonded sheet 29 (3-b).
Next, the laminated sheet 29 is dipped in a solution tank 33 containing a thermosetting resin 31
such as a phenol solution to impregnate the thermosetting resin 31 (3-c).
Next, the laminated sheet 29 is taken out of the solution tank 33 and dried, and then set in a
mold consisting of a male mold 37 and a female mold 39 provided with a heater 35, and heat
press molded (3-e) .
After heat-pressing, fine particles such as sandblast are applied to the reinforcing sheet 24
formed in the roughly dome-shaped temporary central vibrating portion 19 taken out of the
mold and scraped off, or the thickness adjusting means 47 Then, the outer periphery is cut by a
finishing means (not shown) to form a regular dome-shaped central vibrating portion 19 (3-g).
The reason for using means for reducing the thickness after hot pressing is that the thin wood
sheet before forming is not stable in shape, so that thin sheet processing is difficult and the thin
sheet tends to be broken.
In the case of the shape after heat forming, since the shape is stable, thinning in sand blasting,
grinding and the like becomes easy, and as a result, weight reduction becomes possible.
Next, a bonded sheet 29 formed in a regular approximately dome-shaped central vibration
portion 19 and a frame 13 in which an end portion of the edge portion 21b is formed over the
entire outer periphery of the central vibration portion 19 accommodates the magnetic circuit 9
By laminating and bonding the synthetic resin film 25 formed on the substantially dome-shaped
outer peripheral vibrating portion 21 fixed to the outer side by, for example, heat pressing or
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pressure bonding via the adhesive 43; Is formed into a second thickness region D-1 including the
thickness region D of the first thickness region D and the edge portion 21b of the outer
peripheral vibration portion 21 and thinner than the first thickness region D while the weight is
reduced The obtained diaphragm 11 is obtained (3-g).
[0044]
FIG. 6 shows a fourth method of manufacturing the diaphragm 11.
The manufacturing method shown in FIG. 6 is characterized in that the weight characteristics of
the diaphragm 11 can be reduced to follow the movement of the high range without difficulty,
thereby improving the frequency characteristics of the high range.
[0045]
That is, the wooden sheet 23 is boarded from the log-shaped wood 27 (4-a).
In one of the reinforcing sheets 24 to be bonded to one side of the sheeted wooden sheet 23, in
this embodiment, the reinforcing sheet 24 is dipped in a solution tank 33 containing a
thermosetting resin 31 such as a phenol solution, The thermosetting resin 31 is impregnated (4b).
In this case, the wooden sheet 23 may be impregnated with the thermosetting resin 31 at the
same time. Next, after taking out the reinforcing sheet 24 from the solution tank 33 and drying
it, the reinforcing sheet 24 and the wooden sheet 23 are respectively set in a mold consisting of a
male mold 37 and a female mold 39 equipped with a heater 35 and heated press It shape | molds
(4-c).
[0046]
At this time, even with the thin reinforcing sheet 24 and the wooden sheet 23, it is possible to
obtain the laminated sheet 29 with high accuracy and reduced weight, so that the approximate
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center of the approximate dome shape temporary The first plate thickness area D with high
processing accuracy can be obtained by cutting (4-d) the outer periphery of the vibrating portion
with an finishing means (not shown) as indicated by an arrow. Next, a bonded sheet 29 formed in
a regular approximately dome-shaped central vibration portion 19 and a frame 13 in which an
end portion of the edge portion 21b is formed over the entire outer periphery of the central
vibration portion 19 accommodates the magnetic circuit 9 By laminating and bonding the
synthetic resin film 25 formed on the substantially dome-shaped outer peripheral vibrating
portion 21 fixed to the outer side by, for example, heat pressing or pressure bonding via the
adhesive 43; Is formed into a second thickness region D-1 including the thickness region D of the
first thickness region D and the edge portion 21b of the outer peripheral vibration portion 21
and thinner than the first thickness region D while the weight is reduced The obtained
diaphragm 11 is obtained (4-e).
[0047]
FIG. 7 shows a fifth diaphragm manufacturing method different from that of the diaphragm 11
shown in FIG. In the manufacturing method of FIG. 7, as shown in FIG. 2, by making diaphragms
11 different in three plate thickness regions D, D-1 and D-2, weight reduction of the diaphragm
11 is achieved and the movement of high frequency range follows without difficulty. It is
characterized in that the frequency characteristic of the high-pitched range is improved by
making it possible.
[0048]
That is, obtaining the diaphragm 11 from the central vibrating portion 19 and the outer
peripheral vibrating portion 21 in the steps (5-a) to (5-g) is the same as the first manufacturing
method shown in FIG. In the fifth manufacturing method, after the step (5-g), a portion L (central
portion region) of the synthetic resin film 25 applied to the central vibration portion 19 is further
removed by, for example, applying a polishing jig 49 as an example. The second plate thickness
region D including the central portion of the central vibration portion 19 and the second plate
thickness region including the edge portion 21 b of the outer peripheral vibration portion 21 are
thinner than the first plate thickness region D. A third plate thickness region D− including a
plate thickness region D-1 of the third embodiment and a connecting portion 20 of the central
vibrating portion 19 and the outer peripheral vibrating portion 21 and having a plate thickness
thicker than the first plate thickness region D To obtain a diaphragm 11 (5-h) which is molded
into two and reduced in weight. That. Alternatively, the substantially dome portion of the
synthetic resin film previously formed into the diaphragm shape may be removed by die cutting
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or the like, and an adhesive may be applied around the removed hole to connect with the central
vibration portion 19 .
[0049]
In this case, although the steps (5-a) to (5-g) follow the steps shown in FIG. 3, they are means
using a step of laminating and bonding using an adhesive as shown in FIG. May be
[0050]
The electro-acoustic transducer of the present invention can be applied to a full-band small-sized
electrodynamic type speaker such as a headphone or an earphone.
[0051]
BRIEF DESCRIPTION OF THE DRAWINGS General | schematic cutting | disconnection explanatory
drawing of the electroacoustic transducer concerning this invention.
The schematic explanatory drawing which showed the modification of the diaphragm.
BRIEF DESCRIPTION OF THE DRAWINGS The schematic explanatory drawing which showed the
1st manufacturing method of a diaphragm. The outline explanatory view showing the 2nd
manufacturing method of a diaphragm. Outline explanatory drawing which showed the 3rd
manufacturing method of a diaphragm. Outline explanatory drawing which showed the 4th
manufacturing method of a diaphragm. Outline explanatory drawing which showed the 5th
manufacturing method of a diaphragm. Explanatory drawing which compared the wood and
wood other than that which are used as a diaphragm. The schematic explanatory drawing which
showed the diaphragm of the electroacoustic transducer of a prior art example. Explanatory
drawing of a frequency response (output sound pressure frequency characteristic).
Explanation of sign
[0052]
9 Magnetic circuit 11 Diaphragm 13 Frame 19 Central vibration part 21 Peripheral vibration
part 21b Edge part 23 Wood sheet 24 Reinforcement sheet 25 Synthetic resin film D 1st
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thickness area D-1 2nd thickness area D-2 3rd Thickness area of
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