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JP2006319833

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DESCRIPTION JP2006319833
PROBLEM TO BE SOLVED: To complicate the structure of a manufacturing apparatus in the case
where a diaphragm provided on a screen of a mobile phone is composed of a vibrating part, a
holding part held by a case, and an elastic part provided between them. To reduce the
manufacturing cost of the diaphragm. SOLUTION: With a first molding surface 32 of a movable
mold 25 and a second molding surface 30 of a fixed mold 26, a cavity portion 40 for forming a
vibration portion, a cavity portion 41 for forming a holding portion and a cavity portion 42 for
forming an interlocking portion. Form. The resin material is made to flow into the holding
portion molding cavity portion 41. The resin material of the holding portion molding cavity
portion 41 is made to flow from the connection portion molding cavity portion 42 into the
vibration portion molding cavity portion 41 to mold an intermediate molded product. After the
mold is opened, the movable mold 25 holding the intermediate molded product is moved to close
the mold, and the third molding surface 34 of the fixed mold 26 forms a cavity portion for
forming an elastic portion. An elastic material is made to flow into the elastic portion molding
cavity portion, and integrally molded with the intermediate molded product to obtain a
diaphragm. [Selected figure] Figure 5
Diaphragm of speaker for portable device, method of manufacturing the same, and
manufacturing apparatus used for the method of manufacturing
[0001]
The present invention relates to a diaphragm of a speaker for a portable device provided on a
screen of a portable device such as a portable telephone, a method of manufacturing the
diaphragm, and a manufacturing apparatus used for the method.
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1
[0002]
Generally, a portable device such as a portable telephone is provided with a screen for displaying
an image, characters and the like, and a speaker for outputting a sound such as a ringing tone.
In recent years, the size of the screen has been increased in order to increase the amount of
information that can be displayed at one time, while the size of the portable device has been
reduced in size to facilitate portability. Therefore, in portable devices, the space for disposing the
speakers is becoming smaller. As a result, it is necessary to make the diaphragm of the speaker
smaller, and it is difficult to secure a sufficient sound pressure.
[0003]
Therefore, for example, as disclosed in Patent Documents 1 and 2, in a portable device, a
diaphragm made of a transparent resin plate material is superimposed on a screen, and this
diaphragm is vibrated by a vibration source. Therefore, a speaker that converts an electrical
signal into voice may be used. The vibration source of the speaker of Patent Document 1 is
composed of a piezoelectric element having a property of being slightly deformed by the
application of a voltage, and the vibration source of the speaker of Patent Document 2 is
composed of a permanent magnet and a voice coil. . According to the speakers of these Patent
Documents 1 and 2, it becomes possible to make the size of the diaphragm approximately equal
to or larger than the display area of the screen, and to obtain a sufficient sound pressure
relatively easily. It will be possible.
[0004]
Further, when the diaphragm of the speaker is superimposed on the screen as in Patent
Documents 1 and 2 above, in order to ensure the visibility of the screen, the portion of the
diaphragm positioned outside the screen is the portable device. It is supposed to be held in the
case. As a structure for holding the diaphragm in a case, Patent Document 2 divides the
diaphragm into a vibrating portion overlapping the screen and a holding portion separated from
the outer peripheral portion of the vibrating portion, and the vibrating portion and the holding
portion There is disclosed a structure in which an elastic portion made of an elastic material is
provided between the two. Thereby, the vibrating portion is elastically supported by the holding
portion, and the vibration of the vibrating portion is allowed. JP-A-2000-152385 JP-A-2002-
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2
252895
[0005]
However, as in Patent Document 2, when the diaphragm is divided into the vibrating portion and
the holding portion, and an elastic portion made of an elastic material is provided between the
vibrating portion and the holding portion, the diaphragm is manufactured. In this case, it is
necessary to make the resin material flow into the cavity portion for forming the vibration
portion of the mold and the cavity portion for forming the holding portion. In addition, it is
necessary to flow an elastic material different from the resin material constituting the vibrating
portion and the holding portion into the elastic portion molding cavity portion of the molding die.
Therefore, in the apparatus for manufacturing a diaphragm, at least three passages must be
provided in order to allow the material to flow into the cavity for forming the vibration part, the
cavity for forming the holding part, and the cavity for forming the elastic part, respectively. The
structure of the manufacturing apparatus becomes complicated. As a result, the manufacturing
apparatus becomes expensive, and it becomes difficult to reduce the manufacturing cost of the
diaphragm.
[0006]
The present invention has been made in view of such a point, and an object of the present
invention is to provide a diaphragm provided on a screen of a portable device in an overlapping
manner, a vibrator and a holder held by a case, and a space between them. When it comprises
with the elastic part provided in these, the structure of a manufacturing apparatus is avoided and
the cost of a diaphragm is reduced by avoiding.
[0007]
In order to achieve the above object, according to the invention of claim 1, as the invention of the
diaphragm of the speaker for portable device, the vibrating portion and the holding portion are
linked by the connecting portion.
[0008]
Specifically, the diaphragm of the speaker for portable devices provided overlapping on the
screen of the portable device is targeted.
[0009]
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Then, a vibration unit formed in a plate shape covering the screen and excited by a vibration
source, and a holding unit provided at an interval from the outer peripheral portion of the
vibration unit and held by the case of the portable device; An elastic part provided between the
vibrating part and the holding part, integrally formed in the vibrating part and the holding part,
and elastically supporting the vibrating part to the holding part, and a part of the outer
peripheral part of the vibrating part And a connecting portion extending from the holding
portion to the holding portion.
[0010]
According to this configuration, at the time of manufacture, the vibration unit molding cavity unit
for molding the vibration unit, the holding unit molding cavity unit for molding the holding unit,
and the connection for molding the connection unit in the molding die When the cavity forming
portion is formed, the connecting portion extends from the vibrating portion to the holding
portion, so that the cavity forming the vibrating portion and the cavity forming the holding
portion are communicated with each other by the cavity forming the connecting portion. It
becomes a state.
Therefore, when the resin material is caused to flow into one of the cavity portion for forming the
vibration portion and the cavity portion for forming the holding portion, the resin material flows
into the other cavity portion through the cavity portion for forming the connection portion.
As a result, without separately providing the passage for introducing the resin material into the
cavity portion for forming the vibration portion and the cavity portion for forming the holding
portion, the cavity portion for forming the vibration portion, the cavity portion for forming the
holding portion and It is possible to flow the resin material into the interlocking part molding
cavity part and to form the vibrating part, the holding part and the interlocking part.
In addition, the elastic portion can be connected to the vibration portion, the holding portion, and
the connection by causing the elastic material to flow into the elastic portion molding cavity
portion for molding the elastic portion through the passage different from the passage that
allows the resin material described above to flow. It is integrally molded with the part.
[0011]
In addition, although the vibration of the vibrating portion due to the vibration source is slightly
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4
weakened by the vibrating portion and the holding portion being linked by the linking portion,
since the linking portion extends from a part of the vibrating portion, the vibration is The degree
of weakening is small enough to cause no problems.
[0012]
In the invention of claim 2, in the invention of claim 1, the vibrating portion is formed in a
substantially rectangular shape, the holding portion is formed in a rectangular frame shape, and
the linking portion is a center of the vibrating portion in a plan view of the vibrating portion. Are
arranged at symmetrical positions across the
[0013]
According to this configuration, symmetrical portions sandwiching the center of the vibrating
portion are linked to the holding portion by the linking portion.
For this reason, in manufacturing, it becomes possible to connect the cavity portion for forming
the vibration portion and the cavity portion for forming the holding portion of the mold with the
plurality of cavity portions for forming the connecting portion separated from each other.
As a result, it is possible to smoothly flow the resin material that has flowed into the one cavity
portion of the vibration portion molding cavity portion and the holding portion molding cavity
portion from the plurality of mutually separated places into the other cavity portion.
And when providing a plurality of connecting parts in this way, since the connecting parts are
separated from each other, it is possible to avoid that the vibration of the vibrating part is
weakened locally by the connecting parts.
[0014]
According to the invention of claim 3, as the invention of the manufacturing method for
manufacturing the diaphragm of the speaker for portable device, the cavity portion for forming
the vibration portion and the cavity portion for forming the holding portion in a state where the
movable type and the fixed type are closed. While forming, it was made to form a cavity part for
connection part formation which connects both these cavity parts.
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[0015]
Specifically, it is formed in a plate shape covering the screen of the portable device, and is
provided at an interval from the vibrating portion to be vibrated by the vibration source and the
outer peripheral portion of the vibrating portion. Portable device comprising: a holding portion;
and an elastic portion provided between the vibrating portion and the holding portion and
integrally molded with the vibrating portion and the holding portion to elastically support the
vibrating portion with respect to the holding portion. The present invention is directed to a
method of manufacturing a diaphragm of a speaker for a speaker.
[0016]
Then, the mold portion for forming the vibration portion is formed by closing the movable mold
and the fixed mold having the first molding surface for molding one of the front side and the
back side of the diaphragm and the second molding surface for molding the other. And forming a
holding part molding cavity part and forming a connection part molding cavity part for molding a
coupling part extending from a part of the outer peripheral part of the vibrating part to the
holding part, and for forming the vibrating part A resin material in a fluid state is caused to flow
into one cavity portion of the cavity portion and the holding portion molding cavity portion, and
the resin material which has flowed into the cavity portion is caused to flow into the other cavity
portion via the connection portion molding cavity portion. A step of solidifying the resin material
in the cavity portion for forming the vibration portion, the cavity portion for forming the holding
portion, and the cavity portion for forming the connection portion to obtain an intermediate
molded product; The step of opening the movable mold and the fixed mold while holding the
intermediate molded article in the movable mold, and moving the movable mold holding the
intermediate molded article to move the intermediate molded article and the fixed mold (3)
forming a cavity for forming an elastic part by facing the molding surface and closing the
movable mold and the fixed mold, and flowing the elastic material in a fluid state into the cavity
for molding the elastic part; By solidifying, the step of integrally molding the elastic portion with
the intermediate molded product is provided.
[0017]
According to this configuration, when the resin material is caused to flow into one of the cavity
portion for forming the vibration portion and the cavity portion for forming the holding portion,
which is formed by closing the movable mold and the fixed mold, the resin material is produced.
It flows into the other cavity through the connecting cavity forming cavity.
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6
As a result, without separately providing the passage for introducing the resin material into the
cavity portion for forming the vibration portion and the cavity portion for forming the holding
portion, the cavity portion for forming the vibration portion, the cavity portion for forming the
holding portion and A resin material can be made to flow into the interlocking part molding
cavity part to form an intermediate molded product.
Then, the movable mold holding the intermediate molded product is moved, and the movable
mold and the fixed mold are closed to form an elastic portion molding cavity portion.
The elastic portion is integrally molded with the intermediate molded product by flowing the
elastic material into the elastic portion molding cavity portion through a passage other than the
passage through which the resin material described above flows.
[0018]
According to the invention of claim 4, as the invention of the manufacturing apparatus for
manufacturing the diaphragm of the speaker for portable equipment, a molding surface for
integrally molding the vibrating portion of the diaphragm, the holding portion and the
connecting portion extending from the vibration portion to the holding portion Were provided to
the movable mold and the fixed mold, respectively.
[0019]
Specifically, it is formed in a plate shape covering the screen of the portable device, and is
provided at an interval from the vibrating portion to be vibrated by the vibration source and the
outer peripheral portion of the vibrating portion. Portable device comprising: a holding portion;
and an elastic portion provided between the vibrating portion and the holding portion and
integrally molded with the vibrating portion and the holding portion to elastically support the
vibrating portion with respect to the holding portion. The present invention is directed to a
manufacturing apparatus for manufacturing a diaphragm of a speaker for a speaker.
[0020]
A movable having a first molding surface for molding one of the front side and the back side of
an intermediate molded product comprising the vibrating portion, the holding portion, and an
interlocking portion extending from the outer peripheral portion of the vibrating portion to the
holding portion. A mold, a fixed mold having a second molding surface for molding the other of
the front and back sides of the intermediate molded article, and a third molding surface for
molding the elastic portion; Movable mold movement switching between a first position where
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7
the molding surface and the second molding surface of the stationary mold face each other, and a
second position where the first molding surface of the movable mold and the third molding
surface of the stationary mold oppose each other Means, and when the movable mold is in the
first position, the movable mold and the fixed mold are closed by the mold and flow into the
cavity part for forming the vibration part and the cavity part for forming the holding part. Means
for supplying the resin material in the second state, and the movable type A movable mold and
the fixed mold when in the position and configuration and a second material supply means for
flowing an elastic material in a fluid state to the elastic portion molding cavity portion which is
formed by closing the mold.
[0021]
According to this configuration, when the position of the movable mold is set to the first position
by the movable mold moving means and the movable mold and the fixed mold are closed, the
vibrating portion, the holding portion, and the connecting portion of the diaphragm are formed
respectively. A cavity portion for forming the vibration portion, a cavity portion for forming the
holding portion, and a cavity portion for forming the connection portion are formed.
At this time, since the connecting portion extends from the vibrating portion to the holding
portion, the vibrating portion forming cavity portion and the holding portion forming cavity
portion communicate with each other by the connecting portion forming cavity portion.
Then, the resin material supplied to the cavity portion of the vibration portion molding cavity
portion and the holding portion molding cavity portion by the first material supply means flows
into the other cavity portion through the connection portion molding cavity portion. Do.
As a result, without separately providing the passage for introducing the resin material into the
cavity portion for forming the vibration portion and the cavity portion for forming the holding
portion, the cavity portion for forming the vibration portion, the cavity portion for forming the
holding portion and It is possible to flow the resin material into the interlocking part molding
cavity part and to form the vibrating part, the holding part and the interlocking part.
[0022]
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Then, with the movable mold and the fixed mold open, when the movable mold is positioned at
the second position by the movable mold moving means and the movable mold and the fixed
mold are closed, the third molding surface is used to form the elastic portion. A cavity is formed.
Then, when the elastic material is caused to flow into the elastic portion molding cavity portion
by the second material supply means, the elastic portion is integrally molded with the vibrating
portion, the holding portion, and the connection portion.
[0023]
According to the invention of claim 1, when the elastic portion is provided between the vibrating
portion formed to cover the screen of the portable device and the holding portion held by the
case of the portable device, the outer peripheral portion of the vibrating portion In the
manufacturing process, the resin for forming the vibrating portion for forming the vibrating
portion, the cavity portion for forming the holding portion, and the cavity for forming the
continuous portion are formed in one passage. The material can flow in. As a result, it is
sufficient to provide two passages together with the passage for the elastic material for forming
the elastic part in the manufacturing apparatus, so that the structure of the manufacturing
apparatus is prevented from being complicated, and The manufacturing cost can be reduced.
[0024]
According to the second aspect of the present invention, the symmetrical positions sandwiching
the center of the vibrating portion are respectively linked to the holding portion by the linking
portion, so that the inflow occurs in one cavity portion of the vibrating portion molding cavity
portion and the holding portion molding cavity portion. The resin material can be smoothly
flowed into the other cavity portion, and the occurrence of molding defects can be suppressed.
And in this case, since the connecting portions are separated from each other, it is possible to
avoid that the vibration of the vibrating portion is locally weakened by the connecting portions.
[0025]
According to the invention of claim 3, after the movable mold and the fixed mold are closed, the
resin material made to flow into one of the cavity portion for forming the vibration portion and
the cavity portion for forming the holding portion is used for forming the connection portion.
Since it was made to flow into the other cavity through the cavity, the resin material is made to
11-05-2019
9
flow in one passage into the cavity for forming the vibration part, the cavity for forming the
holding part and the cavity for forming the connection part. Can. As a result, it is sufficient to
provide two passages together with the passage for the elastic material for forming the elastic
part in the manufacturing apparatus, so that the structure of the manufacturing apparatus is
prevented from being complicated, and The manufacturing cost can be reduced.
[0026]
According to the invention of claim 4, when the position of the movable mold is set to the first
position by the movable mold moving means and the movable mold and the fixed mold are
closed, the cavity portion for forming the vibrating portion and the cavity portion for forming the
holding portion It is possible to form an interlocking portion forming cavity portion that allows
the two cavity portions to communicate with each other. The resin material that has flowed into
one of the cavity portion for forming the vibrating portion and the cavity portion for forming the
holding portion can be caused to flow into the other cavity portion by the connection portion
formation cavity. As a result, it is sufficient to provide two passages together with the passage for
the elastic material for forming the elastic part in the manufacturing apparatus, so that the
structure of the manufacturing apparatus is prevented from being complicated, and The
manufacturing cost can be reduced.
[0027]
Hereinafter, embodiments of the present invention will be described in detail based on the
drawings.
[0028]
FIG.1 and FIG.2 is the diaphragm 1 of the speaker for portable devices which concerns on
embodiment of this invention.
Although not shown, the mobile device is a mobile phone, and the diaphragm 1 is provided on
the liquid crystal screen of the mobile phone. The portable telephone is provided with a vibration
source (not shown) for vibrating the diaphragm 1. This vibration source is a well-known one
conventionally used as a vibration source of a speaker such as a portable telephone, and is
composed of a piezoelectric element having a property of being slightly deformed by application
of a voltage, a permanent magnet, a voice coil or the like. Can.
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[0029]
The vibrating plate 1 has a vibrating portion 2 formed in a rectangular shape having
substantially the same size as the display area of the liquid crystal screen, and a holding portion
3 disposed outward from the outer peripheral portion of the vibrating portion 2 by a
predetermined distance. The elastic portion 4 provided between the vibrating portion 2 and the
holding portion 3 and the connecting portion 5 for connecting the vibrating portion 2 and the
holding portion 3 are provided. The elastic portion 4 is integrally formed with the vibrating
portion 2, the holding portion 3 and the connecting portion 5. In a state where the diaphragm 1
is attached to the mobile phone, the liquid crystal screen side of the diaphragm 1 is the back side,
and the opposite side facing the user is the front side.
[0030]
The vibrating portion 2 is formed by molding a transparent resin material into a plate shape
extending substantially in parallel with the liquid crystal screen. As shown in FIG. 2, the outer
peripheral part of the vibrating part 2 has a step shape in which the surface side is cut over the
entire periphery, and the thickness of the outer peripheral part is thinner than the thickness of
the central part .
[0031]
The holding portion 3 is formed by molding the same resin material as that of the vibrating
portion 2 into a rectangular frame shape as shown in FIG. The four corner portions of the holding
portion 3 are formed by curves, and the four side portions of the holding portion 3 extend
substantially in parallel with the outer peripheral portion of the vibrating portion 2. As shown in
FIG. 2, the inner circumferential portion of the holding portion 3 has a step shape in which the
surface side is cut off similarly to the outer circumferential portion of the vibrating portion 2, and
the thickness of the inner circumferential portion of the holding portion 3 is The thickness is
smaller than the thickness of the outer peripheral portion of the holding portion 3. The surface of
the holding portion 3 and the surface of the vibrating portion 2 are substantially coplanar, and
the back surface of the holding portion 3 and the back surface of the vibrating portion 2 are
substantially coplanar. The holding unit 3 is held by a case (not shown) of the mobile phone.
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[0032]
The elastic portion 4 is formed by molding an elastic material such as synthetic rubber, for
example. The elastic portion 4 is welded to the outer peripheral portion of the vibrating portion 2
and is welded to the inner peripheral portion of the holding portion 3. The vibrating portion 2 is
elastically supported by the holding portion 3 by the elastic portion 4 so that the vibration of the
vibrating portion 2 is allowed. Since the outer peripheral portion of the vibrating portion 2 and
the inner peripheral portion of the holding portion 3 are stepped as described above, the bonding
area of the vibrating portion 2 and the elastic portion 4 and the bonding of the holding portion 3
and the elastic portion 4 The area is secured widely. Thereby, the vibration part 2, the holding
part 3 and the elastic part 4 are firmly integrated. The surface of the elastic portion 4 and the
surface of the vibrating portion 2 are substantially coplanar, and the back surface of the elastic
portion 4 and the back surface of the vibrating portion 2 are substantially coplanar.
[0033]
The connecting portions 5 are disposed at symmetrical positions sandwiching the center of the
vibrating portion 2 in a plan view of the vibrating portion 2, and are straight from a part of the
outer peripheral part of the vibrating part 2 to a part of the holding part 3 It extends to The
connecting portion 5 is located on the back surface side of the elastic portion 4 and is integrally
molded with the vibrating portion 2 and the holding portion 3 by a resin material constituting
the vibrating portion 2 and the holding portion 3. The dimension of the connecting portion 5 in
the front and back direction (left and right direction in FIG. 2C) is set shorter than the dimension
of the vibrating portion 2 in the front and back direction. The dimension and width dimension
(left and right direction in FIG. 2A) of the connecting portion 5 in the front and back direction are
respectively set to 0.2 mm or more and 0.6 mm or less.
[0034]
As described above, since the vibrating portion 2 and the holding portion 3 are linked by the
linking portion 5, when the holding portion 3 is held in the above case, the vibration of the
vibrating portion 2 due to the vibration source becomes slightly weak. Since the portion 5 is thin
in the above-mentioned size range and formed to extend from a part of the vibrating portion 2,
the degree of the weakening of the vibration is so small as not to be a problem. Further, since the
connecting portions 5 are separated from each other, it is possible to avoid that the vibration of
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the vibrating portion 2 is locally weakened by the connecting portion 5.
[0035]
Next, the structure of the manufacturing apparatus 20 which manufactures the diaphragm 1
comprised as mentioned above is demonstrated. As shown in FIG. 3, the manufacturing apparatus
20 includes a molding die 21 for molding the vibrating portion 2, the holding portion 3, the
elastic portion 4 and the connecting portion 5, and a resin material supply device 22 for
supplying a transparent resin material. , And an elastic material supply device 23 for supplying
an elastic material.
[0036]
The forming die 21 includes a movable die 25 and a stationary die 26, and after forming an
intermediate molded product 27 (shown in FIG. 6) including the vibrating portion 2, the holding
portion 3 and the connecting portion 5, the intermediate portion The elastic portion 4 is formed
integrally with the molded product 27. The movable mold 25 is moved in the horizontal direction
by a moving device (not shown) so as to be brought into and out of contact with the fixed mold
26. A state where the movable mold 25 is in contact with the fixed mold 26 is a mold closed
state, and in this mold closed state, the movable mold 25 and the fixed mold 26 are clamped by a
mold clamping device (not shown). Further, the movable mold 25 is provided with an eject pin or
the like (not shown).
[0037]
A concave upper first molding surface 30 for molding the back side of the intermediate molded
product 27 is formed on the upper half of the movable mold 25. A lower first molding surface 31
similar to the upper first molding surface 30 is formed on the lower half of the movable mold 25
to be separated downward from the upper first molding surface 30. The upper first molding
surface 30 and the lower first molding surface 31 are formed to hold the intermediate molded
product 27.
[0038]
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On the other hand, as shown also in FIG. 4, an upper second molding surface 32 for molding the
front side of the intermediate molded product 27 is formed on the upper side of the fixed mold
26. A lower second molding surface 33 similar to the upper second molding surface 32 is formed
on the lower side of the fixed mold 26 so as to be separated downward from the upper second
molding surface 32. A third molding surface 34 for molding the elastic portion 4 is provided
between the upper second molding surface 32 and the lower second molding surface 33 of the
fixed mold 26. The separation distance between the upper second molding surface 32 and the
third molding surface 34 is set to be substantially the same as the separation distance between
the upper first molding surface 30 and the lower first molding surface 31. Further, the
separation distance between the third molding surface 34 and the lower second molding surface
33 is also set substantially the same as the separation distance between the upper first molding
surface 30 and the lower first molding surface 31.
[0039]
The upper second molding surface 32 and the lower second molding surface 33 are flat surfaces
32a and 33a, and annular ridge portions 32b and 33b for molding the outer peripheral portion
of the vibrating portion 2 and the inner peripheral portion of the holding portion 3. It consists of
Notches 32c and 33c corresponding to the shape of the connecting portion 5 are respectively
formed at locations corresponding to the connecting portion 5 of the protruding portions 32b
and 33b. Further, the third molding surface 34 is constituted by a substantially flat surface.
[0040]
The movable mold 25 is vertically moved by a slide device 36 as movable mold moving means.
The slide device 36 is constituted by a fluid pressure cylinder operated by fluid pressure. The
movable mold 25 is switched by the slide device 36 between the first position of the rising end
shown in FIG. 6 and the second position of the falling end shown in FIG. When the movable mold
25 is in the first position, as shown in FIGS. 3 and 6, the upper first molding surface 30 faces the
upper second molding surface 32, and the lower first molding surface 31 is third molded. It faces
the surface 34. On the other hand, when the movable mold 25 is in the second position, as shown
in FIG. 7, the upper first molding surface 30 faces the third molding surface 34, and the lower
first molding surface 31 is the lower second molding. It faces the surface 33.
[0041]
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As shown in FIG. 5, when the movable mold 25 and the fixed mold 26 are closed with the
movable mold 25 at the first position, the upper first molding surface 30 and the upper second
molding surface 32 form a cavity portion for forming the vibration portion. 40 and the cavity 41
for forming the holding portion are formed, and the notch portion 32c, 33c of the protruding
portions 32b, 33b allows the cavity portion 40 for forming the vibrating portion and the cavity
41 for forming the holding portion to communicate with each other. An interlocking portion
molding cavity portion 42 is formed. Furthermore, at this time, when the intermediate molded
product 27 is held by the lower first molding surface 31, the third molding surface 34 forms an
elastic portion molding cavity (not shown).
[0042]
On the other hand, as shown in FIG. 7, when the movable mold 25 is closed as the second
position, the lower first molding surface 31 and the lower second molding surface 33 form the
cavity 40 for forming the vibrating portion and the holding portion. The cavity portion 41 and
the connecting portion forming cavity portion 42 are formed. Furthermore, at this time, when the
intermediate molded product 27 is held by the upper first molding surface 30, the third molding
surface 34 forms the elastic portion molding cavity portion 44.
[0043]
The resin material is allowed to flow into the upstream resin passage 45 to which the resin
material supply device 22 is connected and the holding portion molding cavity portion 41
formed when the movable die 25 is at the first position. An upper resin passage 46 and a lower
resin passage 47 for allowing the resin material to flow into the holding portion molding cavity
portion 41 formed when the movable die 25 is at the second position are formed. The
downstream end of the upper resin passage 46 is open at a position corresponding to the holding
portion molding cavity portion 41 of the upper second molding surface 32. The downstream end
of the lower resin passage 47 is open at a position corresponding to the holding portion molding
cavity portion 41 of the lower second molding surface 33.
[0044]
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Further, the fixed mold 26 is provided with a passage switching device 50 that causes the
upstream resin passage 45 to communicate with one of the upper resin passage 46 and the
lower resin passage 47. The passage switching device 50 includes a cylinder 51 extending in the
vertical direction and having an open upper end, a piston 52 inserted into the cylinder 51, and a
piston drive device 53 for moving the piston 52 in the center line direction of the cylinder 51.
There is. At the inner surface of the cylinder 51, the downstream end of the upstream resin
passage 45 is open. Further, on the inner surface of the cylinder 51, the upstream end of the
upper resin passage 46 and the upstream end of the lower resin passage 47 are opened on the
opposite side of the opening of the upstream resin passage 45. The upstream end of the upper
resin passage 46 is located above the upstream end of the lower resin passage 47.
[0045]
A first passage 54 is formed in the upper half of the piston 52, and a second passage 55 is
formed in the lower half. The piston drive device 53 is composed of a fluid pressure cylinder
operated by fluid pressure. The piston drive device 53 has a position at which the piston 52 is
located, a lowered end position (shown in FIG. 3) in which the first passage 54 communicates
with the upper resin passage 46 and the upstream resin passage 45, and the second passage 55
is at the lower side. It is configured to be switched to a rising end position (shown in FIG. 7)
communicated with the resin passage 47 and the upstream resin passage 45. When the position
of the piston 52 is at the lowering end position, the second passage 55 does not communicate
with the lower resin passage 47 and the upstream resin passage 45, and when it is at the rising
end position. The first passage 54 does not communicate with the upper resin passage 46 and
the upstream resin passage 45.
[0046]
Further, an elastic material passage 56 to which the elastic material supply device 23 is
connected is formed in the fixed mold 26. The elastic material passage 56 is for causing the
elastic material to flow into the elastic portion molding cavity portion 44. The elastic material
passage 56 extends around the outside of the cylinder 51. The downstream end of the elastic
material passage 59 is opened at a position corresponding to the elastic portion molding cavity
portion 44 of the third molding surface 34.
[0047]
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The resin material supply device 22 and the elastic material supply device 23 are known
injection molding machines conventionally used in this type of manufacturing device 20. That is,
the resin material supply device 22 and the elastic material supply device 23 include a cylinder
and a screw (not shown) for kneading the material, and nozzles 22a and 23a for injecting the
material in a fluid state in the cylinder. There is. The resin material supply device 22, the
upstream resin passage 45, the upper resin passage 46, the lower resin passage 47, and the
passage switching device 50 constitute a first material supply means of the present invention.
The elastic material supply device 23 and the elastic material passage 56 constitute a second
material supply means of the present invention.
[0048]
Next, how to manufacture the diaphragm 1 using the manufacturing apparatus 20 configured as
described above will be described. First, as shown in FIG. 5, the movable mold 25 and the fixed
mold 26 are closed by setting the movable mold 25 to the first position by the slide device 36. As
a result, in the forming die 21, the cavity portion for forming the vibration portion 40, the cavity
portion for forming the holding portion 41 and the cavity portion for forming the connection
portion are formed. Further, the position of the piston 52 is set to the lowering end position by
the piston drive device 53 and the upstream resin passage 45 and the upper resin passage 46
are communicated with each other by the first passage 54.
[0049]
Then, the resin material supply device 22 starts supplying the resin material in a fluid state. The
resin material injected from the nozzle 22 a of the resin material supply device 22 sequentially
passes through the upstream resin passage 45, the first passage 54 and the upper resin passage
46 and flows into the holding portion molding cavity portion 41. The resin material that has
flowed into the holding portion molding cavity portion 41 spreads into the holding portion
molding cavity portion 41 and also flows into the vibrating portion molding cavity portion 40
through the two continuous connection portion molding cavity portions 42. And spreads into the
cavity 40 for forming the vibration part. At this time, since the two connecting portion forming
cavity portions 42 are separated from each other, the resin material in the holding portion
forming cavity portion 41 is divided into two and smoothly flows into the vibrating portion
forming cavity portion 40. When the resin material is solidified, as shown in FIG. 6, an
intermediate molded product 27 in which the vibrating portion 2, the holding portion 3 and the
connecting portion 5 are integrated is obtained. The intermediate molded product 27 is held by
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the upper first molding surface 30. Since the dimension in the front and back direction and the
dimension in the width direction of the interlocking portion 5 are ensured to be 0.2 mm or more,
the resin material flowing into the holding portion molding cavity portion 41 passes through the
interlocking portion molding cavity portion 42 It is possible.
[0050]
Then, the movable mold 25 and the fixed mold 26 are opened, and as shown in FIG. 7, the
movable mold 25 and the fixed mold 26 are closed by setting the movable mold 25 to the second
position by the slide device 36. As a result, the elastic portion molding cavity portion 44 is
formed between the third molding surface 34 and the intermediate molded product 27, and the
vibration portion molding cavity portion 40 is held below the elastic portion molding cavity
portion 44. The part molding cavity 41 and the connecting part molding cavity 42 are formed.
Further, the position of the piston 52 is set to the rising end position by the piston drive device
53, and the upstream resin passage 45 and the lower resin passage 47 are communicated with
each other by the second passage 55.
[0051]
Then, the elastic material supply device 23 starts supplying the elastic material in the fluid state,
and the resin material supply device 22 starts supplying the resin material in the fluid state. The
elastic material injected from the nozzle 23 a of the elastic material supply device 23 flows into
the elastic portion molding cavity portion 44 through the elastic material passage 56 and
spreads into the elastic portion molding cavity portion 44. This elastic material is welded and
integrated to the intermediate formed product 27 in the process of solidification, as shown in
FIG. On the other hand, the resin material injected from the nozzle 22 a of the resin material
supply device 22 sequentially passes through the upstream resin passage 45, the second passage
55 and the lower resin passage 47 and flows into the holding portion molding cavity portion 41.
The resin material that has flowed into the holding portion molding cavity portion 41 passes
through the connecting portion molding cavity portion 42 and extends into the vibrating portion
molding cavity portion 40 as described above. When the resin material is solidified, it becomes
an intermediate molded product 27 and is held by the lower first molding surface 31.
[0052]
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Thus, by starting the supply of the elastic material and the resin material from the elastic
material supply device 23 and the resin material supply device 22 respectively, molding of the
elastic portion 4 and an intermediate molded product 27 on the upper side and the lower side of
the movable mold 25 Can be performed simultaneously with The timing to start supplying the
elastic material may not coincide with the timing to start supplying the resin material, and the
timing to start supplying the elastic material may be earlier than the timing to start supplying the
resin material. You may or may be late.
[0053]
Thereafter, as shown in FIG. 9, the movable mold 25 and the fixed mold 26 are opened, the
diaphragm 1 held on the upper first molding surface 30 is removed by the eject pin, and the slide
device 36 is further formed. As a result, the position of the movable mold 25 is set to the first
position. Thereafter, the movable mold 25 and the fixed mold 26 are closed. Thus, although not
shown, a cavity 44 for forming an elastic portion is formed between the third molding surface 34
and the intermediate molded product 27, and a cavity for forming a vibration portion on the
upper side of the cavity 44 for forming an elastic portion. The portion 40, the holding portion
molding cavity portion 41, and the connection portion molding cavity portion 42 are formed.
Further, the position of the piston 52 is brought to the rising end position by the piston drive
device 53. Then, the elastic material supply device 23 starts supplying the elastic material, and
the resin material supply device 22 starts supplying the resin material, whereby the elastic
portion 4 is formed as shown in FIG. A molded article 27 is molded.
[0054]
As described above, according to this embodiment, since the vibrating portion 2 and the holding
portion 3 are connected by the connecting portion 5, the resin that has flowed into the holding
portion molding cavity portion 41 during manufacture The material can be made to flow into the
vibration part molding cavity part 40 through the connection part molding cavity part 42.
Thereby, when the intermediate molded product 27 is molded by the upper first molding surface
30, the cavity portion 40 for forming the vibration portion, the cavity portion 41 for forming the
holding portion, and the cavity portion for forming the connection portion are formed by one
upper resin passage 46. When the intermediate molded product 27 is molded with the lower first
molding surface 31 by allowing the resin material to flow into 42 and the intermediate molded
product 27 is molded by the lower first molding surface 31, the vibrating portion is achieved by
one lower resin passage 47. A resin material can be made to flow into the molding cavity portion
40, the holding portion molding cavity portion 41 and the connection portion molding cavity
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portion 42, and the intermediate molded product 27 can be molded.
[0055]
Then, the movable mold 25 holding the intermediate molded product 27 is moved to close the
movable mold 25 and the fixed mold 26 to form an elastic part molding cavity part 44, and then
the elastic part molding cavity part 44 is formed. By flowing the elastic material through the
elastic material passage 56, it is possible to obtain the diaphragm 1 in which the elastic portion 4
is integrally formed on the intermediate molded product 27.
[0056]
When the intermediate molded product 27 is formed by the upper first molding surface 30 in
this manner, the fixed mold 26 may have two passages of the upper resin passage 46 and the
elastic material passage 56. In the case where the lower first molding surface 31 is formed, two
passages of the lower resin passage 47 and the elastic material passage 56 may be provided.
Therefore, the structure of the manufacturing apparatus 20 is complicated when the diaphragm
1 is configured by the vibrating unit 2, the holding unit 3 held by the case of the portable
telephone, and the elastic unit 4 disposed therebetween. Can be avoided, and the manufacturing
cost of the diaphragm 1 can be reduced.
[0057]
Further, since the symmetrical portions sandwiching the center of the vibrating portion 2 are
respectively linked to the holding portion 3 by the linking portion 5, the cavity portion for
forming the vibrating portion 40 and the cavity portion for holding the holding portion 41 are
separated from each other during manufacturing. It can be made to communicate by the cavity
part 42 for connection part formation in a position. As a result, the resin material that has flowed
into the holding portion molding cavity portion 41 can smoothly flow into the vibrating portion
molding cavity portion 40 from two places separated from each other, and generation of molding
defects can be suppressed. . And, when the plurality of connecting portions 5 are provided in this
way to suppress molding defects, since the connecting portions 5 are separated from each other,
it is possible to avoid that the vibration of the vibrating portion 2 is locally weakened by the
connecting portion 5 be able to.
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[0058]
In this embodiment, the resin material is made to flow into the holding portion molding cavity
portion 41 and then made to flow into the vibration portion molding cavity portion 40. However,
the present invention is not limited thereto. It may be made to flow into the cavity portion 40 and
then into the holding portion molding cavity portion 41. In this case, the downstream end of the
upper resin passage 46 is opened at a position corresponding to the cavity molding cavity
portion 40 of the upper second molding surface 32, and the downstream end of the lower resin
passage 47 is the lower second molding surface The opening 33 may be opened at a position
facing the vibration portion molding cavity portion 40.
[0059]
Further, in this embodiment, the movable mold 25 is provided with two first molding surfaces 30
and 31 and the fixed mold 26 is provided with two second molding surfaces 32 and 33 to form
the intermediate molded product 27 and the elastic portion 4. However, the present invention is
not limited to this, and the first molding surface of the movable mold 25 and the second molding
surface of the fixed mold 26 may be respectively one. By doing this, in the fixed mold 26, one of
the upper resin passage 46 and the lower resin passage 47 can be omitted, and the passage
switching device 50 can also be omitted.
[0060]
Further, in this embodiment, the movable mold 25 is moved in the horizontal direction so as to
be in contact with and separated from the fixed mold 26. However, the second molding surface
32, 33 and the third molding surface 34 of the fixed mold 26 are upward. Alternatively, the
movable mold 25 may be moved in the vertical direction to contact or separate the fixed mold
26.
[0061]
Further, the number of connecting portions 5 may be one or three or more.
Further, the position at which the connecting portion 5 is provided and the shape of the
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connecting portion 5 can be set arbitrarily.
[0062]
Moreover, the diaphragm 1 can be utilized also for speakers, such as a portable information
terminal other than a mobile telephone, for example.
[0063]
As described above, the diaphragm of the speaker for portable device according to the present
invention, the method of manufacturing the same, and the manufacturing apparatus used in the
method of manufacturing are, for example, the diaphragm of the speaker provided overlapping
on the screen of the mobile phone and the vibration It can be used when manufacturing a board.
[0064]
It is the top view which looked at the diaphragm concerning the embodiment of the present
invention from the front side.
A diaphragm is shown, (a) is sectional drawing in the AA line of FIG. 1, (b) is the sectional view in
the BB line of FIG. 1, (c) is the CC line of FIG. FIG.
It is a sectional view showing a schematic structure of a manufacturing device concerning an
embodiment of the present invention. It is the front view which looked at a fixed type | mold
from the 2nd molding surface side. It is the FIG. 3 equivalent view of the state which made the
movable type | mold the 1st position and closed the type | mold. It is the FIG. 3 equivalent view
of the state which made the resin material flow in into the cavity part for vibration part
formation, the cavity part for holding part formation, and the cavity part for connection part
formation. It is the FIG. 3 equivalent view of the state which made the movable type | mold the
2nd position and closed the type | mold. FIG. 4 is a view corresponding to FIG. 3 in which the
elastic material is made to flow into the elastic portion forming cavity portion and the resin
material is made to flow into the vibrating portion forming cavity portion, the holding portion
forming cavity portion and the connecting portion forming cavity portion. It is the FIG. 3
equivalent view which shows the state which mold-released and the diaphragm was demoulded.
It is the FIG. 3 equivalent view of the state which made the movable type | mold the 1st position,
and closed the type | mold after removing a diaphragm.
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Explanation of sign
[0065]
DESCRIPTION OF SYMBOLS 1 diaphragm 2 vibration part 3 holding part 4 elastic part 5
connection part 20 manufacturing apparatus 21 molding type 22 resin material supply
apparatus 23 elastic material supply apparatus 25 movable type 26 fixed type 27 middle molded
article 30, 31 first molding surface 32, 33 second molding surface 34 third molding surface 36
slide device 40 cavity portion for forming vibration portion 41 cavity portion for forming holding
portion 42 cavity portion for forming connection portion
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