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JP2006319834

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DESCRIPTION JP2006319834
PROBLEM TO BE SOLVED: To reduce the number of manufacturing steps of a diaphragm by
eliminating the work of removing marks of a resin material passage when manufacturing a
diaphragm for a speaker provided on a screen of a cellular phone using an injection molding
method. . SOLUTION: A movable mold 25 and a fixed mold 26 are closed, and a cavity for
forming a vibrating portion and a cavity for forming a holding part are formed by a first molding
surface 39 of the movable mold 25 and a second molding surface 32 of the fixed mold 26. Form
The resin material is made to flow into the cavity for forming the vibration portion from the
portion corresponding to the surface to which the elastic portion of the vibration portion is
joined, and is made to flow into the cavity for forming the holding portion. The mold is opened in
a state where the primary molded product obtained thereby is held on the first molding surface
30. The movable mold 25 is moved to make the primary molded product face the third molding
surface 34 of the fixed mold 26 so as to close the mold, thereby forming an elastic part molding
cavity. The elastic material is made to flow into the elastic portion forming cavity. The elastic
material covers and hides the mark of the resin material passage left in the primary molded
product. [Selected figure] Figure 3
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, a manufacturing method for manufacturing the diaphragm, and a
manufacturing apparatus used for the manufacturing method.
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1
[0002]
Generally, for example, 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, which makes it difficult to secure a sufficient sound pressure.
[0003]
Therefore, in a portable device, for example, as disclosed in Patent Document 1, a transparent
resin diaphragm provided so as to overlap on a screen is vibrated by a vibration source
constituted by a permanent magnet and a voice coil. In some cases, a speaker that converts an
electrical signal to voice may be used.
[0004]
The diaphragm of Patent Document 1 is divided into a plate-like vibrating portion that is vibrated
by a vibration source and a frame-shaped holding portion that is held by a portable device.
An elastic portion made of an elastic material is provided between the vibrating portion and the
holding portion, and the elastic portion is joined to the vibrating portion and the holding portion.
By providing the elastic portion between the vibrating portion and the holding portion as
described above, the vibrating portion is elastically supported by the holding portion, and the
vibration of the vibrating portion is allowed. Japanese Patent Laid-Open No. 2002-252895
[0005]
By the way, the diaphragm made of resin like patent document 1 is manufactured in many cases
using the injection molding method. Since this injection molding method is a method in which the
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resin material is made to flow into the cavity of the mold by the resin material passage, the
downstream end of the resin material passage is opened to the molding surface. When the resin
material passage is opened to the molding surface, the resin material in the vicinity of the cavity
of the resin material passage is separated from the surfaces of the vibration portion and the
holding portion when the vibration portion and the holding portion are separated from the
molding surface after molding. It will be. As a result, traces of the resin material passage called
gate marks are left on the vibrating portion and the holding portion. Among the vibrating portion
and the holding portion, the mark of the resin material passage remaining in the vibrating
portion is likely to be noticeable by the user because the vibrating portion covers the screen, and
the appearance of the diaphragm is deteriorated. It becomes a factor. Therefore, it is necessary to
remove the mark of the resin material passage left in the vibrating part, and it is difficult to
reduce the number of manufacturing steps of the diaphragm.
[0006]
The present invention has been made in view of such a point, and the purpose of the present
invention is that, when the diaphragm is manufactured using the injection molding method, the
marks of the resin material passage do not appear in the appearance of the vibrating portion This
makes it possible to improve the appearance of the diaphragm while eliminating the work of
removing the mark of the resin material passage, and thus reducing the number of
manufacturing steps of the diaphragm.
[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 is provided with the bonding
surface to which the elastic portion is bonded, and the trace of the resin material passage is left
in the bonding surface. I did it.
[0008]
Specifically, the diaphragm of the speaker for portable devices provided overlapping on the
screen of the portable device is targeted.
[0009]
The holding unit is formed in a plate shape that covers the screen and is spaced from the resin
vibrating portion excited by the vibration source and the outer peripheral portion of the vibrating
portion, and held by the case of the portable device. And an elastic part provided between the
vibrating part and the holding part and elastically supporting the vibrating part to the holding
part, and the vibrating part is provided with a bonding surface to which the elastic part is
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bonded. The mark of the resin material passage formed when molding the vibrating portion with
a molding die is left on the bonding surface.
[0010]
According to this configuration, since the elastic portion is joined to the joint surface of the
vibrating portion, the mark of the resin material passage remaining on the joint surface is
covered and hidden by the elastic portion.
As a result, the mark of the resin material passage does not appear on the appearance of the
vibrating portion.
[0011]
In the invention of claim 2, as a manufacturing method for manufacturing the diaphragm of the
speaker for portable device, when the resin material is made to flow into the vibration portion
molding cavity after forming the vibration portion molding cavity, the elastic portion of the
vibration portion Flow from the point corresponding to the surface to be joined.
[0012]
Specifically, it is formed in a plate shape covering a screen, and is provided with a vibrating
portion excited by a vibration source, and a holding portion provided at an interval from the
outer peripheral portion of the vibrating portion and held by a case of a portable device.
Manufacturing a diaphragm of a speaker for a portable device comprising: an elastic portion
provided between the vibrating portion and the holding portion and joined to the vibrating
portion and the holding portion to elastically support the vibrating portion with respect to the
holding portion Target manufacturing methods.
[0013]
And forming a cavity for forming the vibrating portion and a cavity for forming the holding
portion by closing the movable mold and the fixed mold with the first molding surface of the
movable mold and the second molding surface of the fixed mold; A step of causing the material
to flow into the cavity for forming the vibration portion from a location corresponding to the
surface to which the elastic portion of the vibration portion is joined by the resin material
passage; and a resin material flowing into the cavity for forming the holding portion by the resin
material passage. And the movable mold and the stationary mold in a state where the primary
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molded product obtained by solidifying the resin material flowing into the vibration part molding
cavity and the holding part molding cavity is held on the first molding surface. And moving the
movable mold holding the primary molded article until the primary molded article faces the third
molding surface of the fixed mold to close the movable mold and the fixed mold. Elastic part
molding Forming a tee and allowed to flow into the elastic material in the elastic portion molding
cavities a structure and a step of integrally molded with the primary molded product.
[0014]
According to this configuration, the movable mold and the stationary mold are opened after the
resin material flowing into the cavity for forming the vibrating portion and the cavity for forming
the holding portion formed by closing the movable mold and the stationary mold is solidified.
Then, the resin material in the vicinity of the cavity for molding the vibration portion of the resin
material passage is separated from the vibration portion, and the resin material in the vicinity of
the cavity for molding the holding portion of the resin material passage is separated from the
holding portion.
At this time, since the resin material is made to flow into the vibration part molding cavity from
the location corresponding to the surface to which the elastic part of the vibration part joins, the
vibration part has a resin material passage on the surface to which the elastic part joins. There is
a trace.
Then, after moving the movable mold, when the elastic material flows into the cavity for forming
an elastic portion formed by closing the movable mold and the fixed mold, the elastic material of
the vibrating portion is joined. It spreads so as to cover the surface and is molded to become an
elastic part.
Therefore, the trace of the resin material passage left in the vibrating portion is covered by the
elastic portion.
As a result, the mark of the resin material passage does not appear on the appearance of the
vibrating portion.
[0015]
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In the invention of claim 3, as a manufacturing apparatus for manufacturing the diaphragm of
the speaker for portable device, the resin material passage is provided in the fixed type, and the
communication portion with the cavity for molding the vibration portion in the resin material
passage is the elasticity of the vibration portion It was made to position in the place
corresponding to the field which a part joins.
[0016]
Specifically, it is formed in a plate shape covering a screen, and is provided with a vibrating
portion excited by a vibration source, and a holding portion provided at an interval from the
outer peripheral portion of the vibrating portion and held by a case of a portable device.
Manufacturing a diaphragm of a speaker for a portable device comprising: an elastic portion
provided between the vibrating portion and the holding portion and joined to the vibrating
portion and the holding portion to elastically support the vibrating portion with respect to the
holding portion Target manufacturing equipment.
[0017]
Then, a movable mold having a first molding surface for molding one of the front side and the
rear side of the primary molded product provided with the vibrating portion and the holding
portion, and a second molding for molding the other of the front side and the rear side of the
primary molded product. Surface and a fixed mold having a third molding surface for molding
the elastic portion, a position of the movable mold, and a first position where the first molding
surface of the movable mold and the second molding surface of the fixed mold face each other A
movable type moving means for switching between a second position in which the first molding
surface of the movable mold and the third molding surface of the fixed mold oppose each other,
and the fixed mold provided with the movable mold in the first position And a resin material
passage communicating with the cavity for forming the vibration portion and the cavity for
forming the holding portion formed by closing the movable die and the fixed die, and the
movable die is provided at the second position Part formed by closing the movable mold and the
fixed mold when An elastic material passage communicating with the mold cavity, a resin
material injection means connected to the upstream end of the resin material passage, and an
elastic material injection means connected to the upstream end of the elastic material passage; A
communication portion of the passage with the vibration portion molding cavity is positioned at
a position corresponding to a surface to which the elastic portion of the vibration portion is
joined.
[0018]
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According to this configuration, when the movable mold is moved to the first position by the
movable mold moving means and the movable mold and the fixed mold are closed, the cavity for
forming the vibrating portion and the cavity for forming the holding portion are formed.
The resin material injected from the resin material injection means flows into the vibration part
molding cavity and the holding part molding cavity through the resin material passage.
At this time, the resin material flowing into the vibrating portion molding cavity flows in from a
portion corresponding to the surface to which the elastic portion of the vibrating portion is
joined.
After the resin material flowing into these cavities is solidified, when the movable mold and the
fixed mold are opened, the resin material in the vicinity of the cavity for molding the vibrating
portion of the resin material passage is separated from the vibrating portion and the holding
portion of the resin material passage The resin material in the vicinity of the molding cavity is
separated from the holding portion.
At this time, since the resin material is made to flow into the vibration part molding cavity from
the location corresponding to the surface to which the elastic part of the vibration part joins, the
vibration part has a resin material passage on the surface to which the elastic part joins. There is
a trace.
Thereafter, when the movable mold is moved to the second position and closed by the movable
mold moving means, a cavity for forming an elastic portion is formed. The elastic material
injected from the elastic material injection means flows into the cavity through the elastic
material passage. When the elastic material flows into the elastic portion forming cavity, the
elastic material spreads and is formed so as to cover the surface to which the elastic portion of
the vibrating portion is joined to form an elastic portion. Therefore, as in the second aspect of the
invention, the trace of the resin material passage of the vibrating portion is covered by the elastic
portion and does not appear in the appearance of the vibrating portion.
[0019]
According to the invention of claim 1, the vibration portion is provided with a bonding surface to
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which the elastic portion is bonded, and a trace of the resin material passage formed when the
vibration portion is molded with a mold is left on the bonding surface. Therefore, the trace of the
resin material passage can be covered and concealed by the elastic portion. As a result, the
diaphragm having a good appearance can be obtained without removing the mark of the resin
material passage, and the number of manufacturing steps of the diaphragm can be reduced.
[0020]
According to the invention of claim 2, after the movable mold and the fixed mold are closed, the
resin material is made to flow into the cavity for forming the vibration part from the location
corresponding to the surface to which the elastic part of the vibration part is joined. Because of
this, it is possible to leave a trace of the resin material passage on the surface to which the elastic
portion is joined in the vibrating portion. Then, since the trace of the resin material passage left
in the vibrating portion can be covered and concealed by the elastic portion, it is possible to
obtain a diaphragm with a good appearance without removing the trace of the resin material
passage. It is possible to reduce the number of manufacturing steps of the plate.
[0021]
According to the third aspect of the present invention, the communicating portion with the cavity
for molding the vibrating portion in the resin material passage is positioned at a position
corresponding to the surface to which the elastic portion of the vibrating portion is joined. In the
portion, it is possible to leave a trace of the resin material passage on the surface to which the
elastic portion is joined. As a result, as in the second aspect of the present invention, it is possible
to obtain a diaphragm having a good appearance without removing the mark of the resin
material passage, and to reduce the number of manufacturing steps of the diaphragm.
[0022]
Hereinafter, embodiments of the present invention will be described in detail based on the
drawings.
[0023]
FIG.1 and FIG.2 is the diaphragm 1 of the speaker for portable devices which concerns on
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embodiment of this invention.
Although not shown, the mobile device is a mobile phone. The diaphragm 1 is provided so as to
overlap on the liquid crystal screen of the mobile phone. Further, a vibration source (not shown)
for vibrating the diaphragm 1 is provided in the mobile phone. This vibration source is a wellknown 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.
[0024]
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. An elastic portion 4 provided between the vibrating portion 2 and the
holding portion 3 is provided. The elastic portion 4 is integrally formed with the vibrating
portion 2 and the holding portion 3. 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,
the side facing the user, is the front side.
[0025]
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 portion of the vibrating portion 2 has a step shape in which the surface side is cut out
over the entire circumference, and the vibrating portion side first longitudinal extends from the
surface to the back surface of the vibrating portion 2 A surface portion 2a, a vibrating portion
side flat portion 2b extending from the back surface side end portion of the vibrating portion
side first vertical surface portion 2a toward the holding portion 3 and an end portion of the
vibrating portion side flat portion 2b from the holding portion 3 side It is comprised by the
vibration part side 2nd vertical surface part 2c extended to the back surface of the vibration part
2. As shown in FIG. Accordingly, the thickness of the outer peripheral portion of the vibrating
portion 2 is thinner than the thickness of the central portion of the vibrating portion 2.
[0026]
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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 peripheral portion of the holding portion 3 has a step shape in which the surface
side is cut off similarly to the outer peripheral portion of the vibrating portion 2, and the holding
extends from the front surface to the back surface of the holding portion 3 Part-side first vertical
surface part 3a, holding-part-side flat part 3b extending from the back-side end of the holdingpart-side first vertical surface part 3a toward the vibrating part 2 side, vibrating part of the
holding-part-side flat part 3b It is comprised by the holding part side 2nd vertical surface part 3c
extended to the back surface of the holding part 3 from the 2 side edge part. Therefore, the
thickness of the inner peripheral portion of the holding portion 3 is thinner 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.
[0027]
The elastic portion 4 is formed, for example, by molding an elastic material such as colored
synthetic rubber. The elastic portion 4 is joined and welded to the vibrating portion side first
vertical surface portion 2a, the vibrating portion side flat portion 2b and the vibrating portion
side second vertical surface portion 2c of the vibrating portion 2, and the holding portion of the
holding portion 3 It is joined and welded to the side 1st vertical surface part 3a, the holding part
side flat part 3b, and the holding part side 2nd vertical surface part 3c. 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.
[0028]
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. Therefore, the vibrating portion 2, the holding portion 3 and the elastic
portion 4 are firmly integrated. The surface of the elastic portion 4 and the surface of the
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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. The vibrating portion side
first vertical surface portion 2a, the vibrating portion side flat portion 2b and the vibrating
portion side second vertical surface portion 2c are joint surfaces to be joined to the elastic
portion 4 of the vibrating portion 2, and the holding portion side first vertical The surface
portion 3 a, the holding portion side flat portion 3 b and the holding portion side second vertical
surface portion 3 c are bonding surfaces to be bonded to the elastic portion 4 of the holding
portion 3.
[0029]
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 is colored, and a molding die 21 for molding the vibrating portion 2, the holding portion 3
and the elastic portion 4, and a resin material injection device 22 for injecting a transparent resin
material. And an elastic material injection device 23 for injecting an elastic material.
[0030]
The molding die 21 includes a movable die 25 and a fixed die 26. After molding a primary
molded article 27 (shown in FIG. 8) provided with the vibrating portion 2 and the holding portion
3, the primary molded article 27 is formed. The elastic portion 4 is configured to be integrally
molded. 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. When the movable
mold 25 is in contact with the fixed mold 26 (shown in FIG. 7), the mold is in a closed state. In
this mold closed state, the movable mold 25 and the fixed mold 26 are clamped by a clamping
device (not shown). It has become. Further, the movable mold 25 is provided with an eject pin or
the like (not shown).
[0031]
A concave upper first molding surface 30 for molding the back side of the primary molded
product 27 is formed in 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
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surface 30 and the lower first molding surface 31 are formed to hold the primary molded
product 27.
[0032]
On the other hand, as shown also in FIG. 4, an upper second molding surface 32 for molding the
front side of the primary 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.
[0033]
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
The third molding surface 34 is formed of a flat surface.
[0034]
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. By the
slide device 36, the movable mold 25 is switched between the first position of the rising end
shown in FIG. 7 and the second position of the falling end shown in FIG. When the movable die
25 is in the first position, as shown in FIGS. 3 and 7, 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. 9, the upper first molding surface 30 faces the third molding surface 34, and the lower
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first molding surface 31 is the lower second molding. It faces the surface 33.
[0035]
As shown in FIG. 7, 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 the cavity 40 for forming the vibration portion. And the cavity 41 for
holding part formation is formed. Furthermore, at this time, when the primary 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).
[0036]
On the other hand, as shown in FIG. 9, 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 cavity for forming the holding portion. 41 are
formed. Furthermore, at this time, when the primary molded product 27 is held by the upper first
molding surface 30, the elastic portion molding cavity 44 is formed by the third molding surface
34.
[0037]
The fixed mold 26 is formed with an upstream resin material passage 45 to which the resin
material injection device 22 is connected. Further, in the fixed mold 26, an upper resin material
passage for flowing the resin material into the cavity 40 for forming the vibration portion and
the cavity 41 for forming the holding portion which are formed by being closed when the
movable mold 25 is at the first position. 46, and a lower resin material passage 47 which allows
the resin material to flow into the cavity 40 for forming the vibration portion and the cavity 41
for forming the holding portion which are formed by closing the mold when the movable mold
25 is at the second position. ing.
[0038]
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The upper resin material passage 46 is branched into a first passage 46 a and a second passage
46 b on the downstream side. As shown to Fig.5 (a), the downstream end of the 1st channel |
path 46a is opened in the part which shape | molds the holding part side plane part 3b in the
protrusion part 32b. The downstream end of the second passage 46b is open at a portion of the
protrusion 32b where the vibrating-portion-side flat portion 2b is to be formed. That is, the
downstream end of the upper resin material passage 46 is a communication portion with the
vibration portion molding cavity 40 and the holding portion molding cavity 41, and as shown in
FIG. 5B, the resin material is the first passage 46a. Thus, the gas flows into the holding portion
molding cavity 41 from a location corresponding to the surface to which the elastic portion 4 of
the holding portion 3 is joined. In addition, the resin material flows into the vibration portion
molding cavity 40 from the location corresponding to the surface to which the elastic portion 4
of the vibration portion 2 is joined by the second passage 46b.
[0039]
Similarly to the upper resin material passage 46, the lower resin material passage 47 also
branches into a first passage 47a and a second passage 47b. The downstream end of the first
passage 47a is open at a portion of the protrusion 32b for forming the holding portion side flat
portion 3b. The downstream end of the second passage 46b is open at a portion of the
protrusion 32b where the vibrating-portion-side flat portion 2b is to be formed. That is, the
downstream end of the lower resin material passage 47 is a communication portion with the
vibration portion molding cavity 40 and the holding portion molding cavity 41, and the resin
material is the elastic portion 4 of the holding portion 3 by the first passage 47a. Flows into the
holding portion molding cavity 41 from a location corresponding to the surface to be joined. In
addition, the resin material flows into the vibration portion molding cavity 40 from the location
corresponding to the surface to which the elastic portion 4 of the vibration portion 2 is joined by
the second passage 47b.
[0040]
In addition, the fixed mold 26 is provided with a passage switching device 50 that causes the
upstream resin material passage 45 to communicate with one of the upper resin material
passage 46 and the lower resin material 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 material passage 45 is open. Further, on the inner surface of the
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cylinder 51, the upstream end of the upper resin material passage 46 and the upstream end of
the lower resin material passage 47 are opened on the side opposite to the opening of the
upstream resin material passage 45. . The upstream end of the upper resin material passage 46
is located above the upstream end of the lower resin material passage 47.
[0041]
An upper passage 54 is formed in the upper half of the piston 52, and a lower 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 piston 52 at a lower end position
(shown in FIG. 3) where the upper passage 54 communicates with the upper resin material
passage 46 and the upstream resin material passage 45, and the lower passage 55 is lower. It is
configured to be switched to the rising end position (shown in FIG. 9) communicated with the
side resin material passage 47 and the upstream side resin material passage 45. When the
position of the piston 52 is at the lowering end position, the lower passage 55 does not
communicate with the lower resin material passage 47 and the upstream resin material passage
45, and is at the rising end position. At the same time, the upper passage 54 is not in
communication with the upper resin material passage 46 and the upstream resin material
passage 45.
[0042]
Further, an elastic material passage 56 to which the elastic material injection 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 44. The elastic material passage 56
extends around the outside of the cylinder 51. The downstream end of the elastic material
passage 59 opens at a position corresponding to the elastic portion molding cavity 44 of the
third molding surface 34.
[0043]
The resin material injection device 22 and the elastic material injection device 23 are known
injection molding machines conventionally used in this type of manufacturing device 20. That is,
the resin material injection device 22 and the elastic material injection device 23 include a
cylinder and a screw (not shown) for kneading the material, and nozzles 22a and 23a for
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injecting the material in the fluid state in the cylinder. There is.
[0044]
Next, how to manufacture the diaphragm 1 using the manufacturing apparatus 20 configured as
described above will be described. First, as shown in FIG. 7, 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.
Thereby, the cavity 40 for forming the vibrating portion and the cavity 41 for forming the
holding portion are formed in the forming die 21. Further, the position of the piston 52 is set to
the lowering end position by the piston drive device 53, and the upstream resin material passage
45 and the upper resin material passage 46 are communicated with each other by the upper
passage 54.
[0045]
Then, the resin material injection device 22 injects the resin material in a fluid state. The resin
material injected from the nozzle 22 a of the resin material injection device 22 sequentially
passes through the upstream resin material passage 45, the upper passage 54 and the upper
resin material passage 46. The resin material flows from the first passage 46 a of the upper resin
material passage 46 into the holding portion molding cavity 41, and the resin material flowing
into the holding portion molding cavity 41 is introduced into the holding portion molding cavity
41. Go around. The resin material flows from the second passage 46 b into the cavity 40 for
forming the vibrating portion, and the resin material flowing into the cavity 40 for forming the
vibrating portion spreads into the cavity 40 for forming the vibrating portion.
[0046]
When the resin material is solidified in the vibration portion molding cavity 40 and the holding
portion molding cavity 41, as shown in FIG. At this time, as shown in FIG. 5B, the resin material
in the first passage 46a solidifies in the vicinity of the holding portion molding cavity 41 of the
first passage 46a, and the vibration portion molding cavity of the second passage 46b. In the
vicinity of 40, the resin material in the second passage 46b is solidified. Further, the primary
molded product 27 is held by the upper first molding surface 30.
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[0047]
Next, the movable mold 25 and the fixed mold 26 are opened. By this mold opening, as shown in
FIG. 6A, the resin material solidified in the first passage 46a and the second passage 46b is the
flat portion 3b of the holding portion side of the holding portion 3 and the flat portion side of the
vibrating portion 2 Separate from part 2b. As a result, the mark W of the resin material passage
remains on the holding portion side flat portion 3 b and the vibrating portion side flat portion 2
b.
[0048]
Thereafter, as shown in FIG. 9, the movable mold 25 is moved to the second position by the slide
device 36, and the movable mold 25 and the fixed mold 26 are closed. As a result, a cavity 44 for
forming the elastic portion is formed between the third molding surface 34 and the primary
molded product 27, and the cavity 40 for forming the vibrating portion and the holding portion
are formed below the cavity 44 for forming the elastic portion. A cavity 41 is 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 material passage 45 and the lower resin material passage 47 are
communicated with each other by the lower passage 55.
[0049]
Then, the elastic material in the fluid state is injected by the elastic material injection device 23,
and the resin material in the fluid state is injected by the resin material injection device 22. The
elastic material injected from the nozzle 23 a of the elastic material injection device 23 flows into
the elastic portion molding cavity 44 through the elastic material passage 56 and extends into
the elastic portion molding cavity 44. As a result, the vibrating portion side first vertical surface
portion 2a, the vibrating portion side flat surface portion 2b and the vibrating portion side
second vertical surface portion 2c of the vibrating portion 2 are covered with the elastic material,
and the holding portion side first vertical surface portion of the holding portion 3 3a, the holding
portion flat portion 3b and the holding portion side second vertical surface portion 3c are
covered. Then, as shown in FIGS. 6 (b) and 10, this elastic material is welded and integrated to
the primary molded product 27 in the process of solidification.
[0050]
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17
On the other hand, the resin material injected from the nozzle 22 a of the resin material injection
device 22 sequentially passes through the upstream resin material passage 45, the lower passage
55 and the lower resin material passage 47. The resin material flows from the first passage 47 a
of the lower resin material passage 47 into the holding portion molding cavity 41, and the resin
material flowing into the holding portion molding cavity 41 is in the holding portion molding
cavity 41. Go around. The resin material flows from the second passage 47 b into the cavity 40
for forming the vibrating portion, and the resin material flowing into the cavity 40 for forming
the vibrating portion spreads into the cavity 40 for forming the vibrating portion. When this
resin material solidifies, it becomes a primary molded product 27 and is held by the lower first
molding surface 31.
[0051]
Thus, by injecting the elastic material and the resin material from the elastic material injection
device 23 and the resin material injection device 22 respectively, the molding of the elastic
portion 4 and the molding of the primary molded article 27 on the upper side and the lower side
of the movable mold 25 And can be done at the same time. The timing to start injection of the
elastic material may not coincide with the timing to start injection of the resin material, and the
timing to start injection of the elastic material may be earlier than the timing to start injection of
the resin material. You may or may be late.
[0052]
Thereafter, as shown in FIG. 11, the movable mold 25 and the fixed mold 26 are opened, and the
diaphragm 1 held on the upper first molding surface 30 is released by the eject pin. Then, the
position of the movable mold 25 is set to the first position by the slide device 36. Thereafter, the
movable mold 25 and the fixed mold 26 are closed. Thereby, although not shown, a cavity 44 for
forming an elastic portion is formed between the third molding surface 34 and the primary
molded product 27, and the cavity 40 for forming a vibration portion is formed above the cavity
44 for forming an elastic portion. A cavity for forming the holding portion 41 is formed. Further,
the position of the piston 52 is brought to the rising end position by the piston drive device 53.
In this state, the elastic material is injected from the elastic material injection device 23 and the
resin material is injected from the resin material injection device 22 to form the elastic portion 4
as shown in FIG. 27 are formed.
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[0053]
As described above, according to this embodiment, the resin material is made to flow into the
cavity 40 for forming the vibrating portion formed by closing the movable mold 25 and the fixed
mold 26 with the movable mold 25 at the first position. In this case, the movable mold 25 and
the fixed mold 26 are molded after the resin material is solidified, because the resin material is
allowed to flow from the location corresponding to the vibrating section side flat section 2b
which is the surface to which the elastic section 4 of the vibrating section 2 is joined. When
opened, the trace W of the second passage 46 b can be formed in the vibrating portion side flat
portion 2 b in the vibrating portion 2. Then, the elastic material is injected to the elastic portion
molding cavity 44 formed by closing the movable mold 25 and the fixed mold 26 with the
movable mold 25 at the second position, so that the elastic material is on the vibrating section
side plane section. The elastic portion 4 is formed by spreading so as to cover 2 b. Therefore, the
mark W of the second passage 46 b left in the vibrating portion 2 is covered and hidden by the
elastic portion 4. Thus, the diaphragm 1 having a good appearance can be obtained without
removing the mark W of the second passage 46b, and the number of manufacturing steps of the
diaphragm 1 can be reduced.
[0054]
Further, in the holding portion 3, the mark W of the first passage 46a remains on the holding
portion side flat portion 3b which is a surface to which the elastic portion 4 is joined. The trace
W of the holding portion 3 is also covered and hidden by the elastic portion 4 in the same
manner as the trace W remaining on the vibrating portion 2 described above.
[0055]
In this embodiment, the downstream side of the upper resin material passage 46 is divided into
the first passage 46a and the second passage 46b. However, as in the modified example shown in
FIGS. 13 and 14, for example, the upper resin material A communication passage 70 extending
from the downstream end of the passage 46 to the holding portion molding cavity 41 may be
provided. In this modification, the downstream end of the upper resin material passage 46 is
open at a position where the vibrating-portion-side flat portion 2b in the protruding portion 32b
is to be formed. The communication passage 70 is substantially V-shaped, and obliquely extends
from the downstream end of the upper resin material passage 46 toward the base of the
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protrusion 32 b, and then the holding portion side flat portion 3 b of the protrusion 32 b is It
extends to the place to be molded. The downstream end of the communication passage 70 is
open at a portion of the protrusion 32 b where the vibrating-portion-side flat portion 2 b is to be
formed. Also, the same communication passage may be provided in the lower resin material
passage 47.
[0056]
In this modification, the resin material of the upper resin material passage 46 flows into the
vibration portion molding cavity 40 and also flows into the holding portion molding cavity 41 via
the communication passage 70. When the movable mold 25 and the fixed mold 26 are opened
while the resin material in the communication passage 70 is solidified, as shown in FIG. 14A, the
resin material in the communication passage 70 is at the center of the communication passage
70. The resin material is cut at a sharp point and remains as a mark W of the resin material
passage, ie, the communication passage 70. Furthermore, the resin material solidified in the
upper resin material passage 46 also remains as the mark W of the resin material passage. The
mark W of the resin material passage remains on the vibrating portion side flat portion 2 b of the
vibrating portion 2 and the holding portion side flat portion 3 b of the holding portion 3, so as
shown in FIG. It can be covered and hidden.
[0057]
Moreover, in this embodiment, the movable mold 25 is provided with the upper first molding
surface 30 and the lower first molding surface 31, and the fixed mold 26 is provided with the
upper second molding surface 32 and the lower second molding surface 33 to be primary.
Although the molding of the molded product 27 and the molding of the elastic portion 4 can be
performed simultaneously, 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 are one
each. It is also good. By doing this, in the fixed mold 26, one of the upper resin material passage
46 and the lower resin material passage 47 can be omitted, and the passage switching device 50
can also be omitted.
[0058]
Further, the downstream end of the upper resin material passage 46 and the lower resin material
passage 47 may be opened in the vibrating portion side first vertical surface portion 2a or the
vibrating portion side second vertical surface portion 2c in the protruding portion 32b, You may
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make it open to the holding part side 1st vertical surface part 3a and the holding part side 2nd
vertical surface part 3c in the strip part 32b.
[0059]
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.
[0060]
Moreover, the diaphragm 1 can be utilized also for speakers, such as a portable information
terminal other than a mobile telephone, for example.
[0061]
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.
[0062]
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.
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.
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It is an enlarged view of the upper resin material passage vicinity of a shaping | molding die, (a)
is a figure which shows the state which closed the mold, (b) is a figure which shows the state
which shape | molded the primary molding. FIG. 5 is a view corresponding to FIG. 5, (a) showing
a state in which the mold is opened after molding of the primary molded product, and (b)
showing a state in which the elastic portion is molded. 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 for vibration
part formation, and the cavity for holding 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 a state in which an elastic material is made to flow into the
elastic portion forming cavity, and a resin material is made to flow into the vibration portion
forming cavity and the holding portion forming cavity. 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. It is the FIG. 5 equivalent view which concerns on the
modification of embodiment. It is the FIG. 6 equivalent view which concerns on the modification
of embodiment.
Explanation of sign
[0063]
Reference Signs List 1 diaphragm 2 vibration unit 3 holding unit 4 elastic unit 20 manufacturing
device 21 molding die 22 resin material injection device (resin material injection means) 23
elastic material injection device (elastic material injection means) 25 movable type 26 fixed type
27 primary molded article 30, 31 first molding surface 32, 33 second molding surface 34 third
molding surface 36 slide device (movable type moving means) 40 cavity for forming vibration
portion 41 cavity for forming holding portion 44 cavity for forming elastic portion 46 upper
resin passage 47 Lower resin passage W Trace of resin material passage
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