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DESCRIPTION JP2000152384

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DESCRIPTION JP2000152384
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic device such as a small speaker, receiver, microphone or the like having a disc-like case
main body, which is used for a portable telephone or other portable terminal. And a small
acoustic device of the type that emits sound by electrostriction of the piezoelectric element.
[0002]
2. Description of the Related Art A piezoelectric acoustic device used for a portable telephone or
a so-called cordless phone has a diaphragm provided with a piezoelectric element inside a thin
box-like case body such as a rectangular or disk shape. . With the miniaturization of portable
telephones, miniaturization of the piezoelectric acoustic device mounted inside the housing is in
progress, and currently, a piezoelectric acoustic device having a small case body of about φ 20 is
used. Such an extremely miniaturized acoustic device can not be screwed the case body to a
housing of a portable terminal or the like, and may be attached to the housing of a portable
telephone with an adhesive or a double-sided adhesive sheet. It is
[0003]
Such a compact acoustic device is supplied from an acoustic device maker to an assembly maker
of a portable telephone in a state where an adhesive member is attached to one main surface of
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its case main body, and the compact acoustic device is a portable telephone by the adhesive
member. Mounted on the inside of the housing of the In this case, before attaching the smallsized acoustic device to the housing of the portable telephone, in order to prevent a decrease in
adhesion due to adhesion of dust or other foreign matter to the adhesion member or a decrease
in handleability due to adhesion of the adhesion member. The small acoustic device is supplied
from the manufacturer with the sheet-like separator attached to the adhesive member, and the
separator is removed immediately before the acoustic device is attached to the housing of the
portable telephone. There is.
[0004]
In order to reduce the price and increase the productivity of mobile phones, the integration of
small acoustic devices into mobile phones is in progress. In such a built-in automation line, the
position of the small acoustic device is detected by an optical sensor or a CCD camera while the
small acoustic device is fed by a conveyor, etc., and the small acoustic device is picked up from
the conveyor by a robot manipulator. A process of incorporating is performed. In this process,
the small acoustic device conveyed by the conveyor is positioned, the small acoustic device is
picked up by the robot's manipulator, the separator is peeled off from the case main body of the
small acoustic device, and the small adhesive member is bonded to the case main body. One main
surface of the case body of the acoustic device is adhered to the inner surface of the housing of
the mobile phone.
[0005]
SUMMARY OF THE INVENTION In the above-described small acoustic device, the separator is
larger than the small acoustic device housing from the viewpoint of workability of separation of
the separator, and the edge of the separator protrudes from the small acoustic device housing. Is
preferred. However, in the process of incorporating the compact acoustic device into a portable
telephone, it is first necessary to position the compact acoustic device conveyed by the conveyor.
At this time, if the edge of the separator protrudes from the housing of the small acoustic device,
the housing of the small acoustic device can not be accurately positioned.
[0006]
SUMMARY OF THE INVENTION In view of the problems with such a conventional small acoustic
device, the present invention is easy to peel off the separator from the adhesive member attached
to one main surface of the case main body of the small acoustic device, and furthermore, the
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small acoustic device transported by a conveyor. It is an object of the present invention to
provide a small-sized acoustic device which can accurately perform the positioning of the device,
and can be easily assembled in an automatic assembly line.
[0007]
SUMMARY OF THE INVENTION In the present invention, in order to achieve the above object, in
the reference surface 15 for aligning small acoustic devices conveyed by a conveyor or the like,
the reference surface 15 of the case main body 11 is used. The edge 17 of the separator 14 is
positioned at a position receding inward, and at least a part of the portion other than the
reference surface 15 is attached so that the separator 14 protrudes from the main surface of the
case main body 11.
[0008]
The small-sized acoustic device is a case in which an element for converting an electrical signal
to sound or an element for converting an audio signal to an electrical signal is housed inside a
case main body 11 as an acoustic box.
In the present invention, such a small-sized acoustic device has a flat reference surface 15 at one
end of a thin box-like case main body 11 and a sheet-like shape through one adhesive member
21 on one main surface of the case main body 11. The edge 17 on the side of the reference
surface 15 of the separator 14 is flush with the reference surface 15 of the case main body 11 or
inside the case main body 11 from the reference surface 15. It is characterized by a certain thing.
[0009]
In such a small acoustic device, the edge 17 of the separator 14 on the side of the reference
surface 15 is flush with the reference surface 15 of the case body 11 or is on the inner side of
the case body 11 from the reference surface 15 When positioning the case main body 11 with
reference to the reference surface 15, the separator 14 is not in the way to cause positioning
errors.
As a result, the robot can accurately grasp the case body 11 using a robot manipulator and
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incorporate it into a housing of a portable communication terminal or the like.
[0010]
On the other hand, at portions other than the reference surface 15, the edge of the separator 14
protrudes outside at least a part of the outer edge of the main surface of the case main body 11,
so the separator 14 is grasped at this portion and is easy from the case main body 11. Can also
be peeled off. In particular, by making part of the separator 14 substantially square with respect
to the disk-shaped case main body 11, the corner of the square part of the separator 14
protrudes from the case main body 11, thereby grasping this part and peeling off the separator
14. be able to.
[0011]
The adhesive member 21 is formed of a circular ring-shaped double-sided adhesive sheet, and
the edge 23 on the reference surface 15 side of the adhesive member 21 is flush with the
reference surface 15 of the case main body 11 or the same reference surface 15 It is inside the
case body 11. The both sides 18 orthogonal to the edge 17 on the reference surface 15 side of
the separator 14 have straight lines parallel to each other. When the case main body 11 is fed by
transport means such as a conveyor, the stop position and the position to be gripped by the
manipulator are determined at the reference surface 15 when positioning the case main body 11.
It can be determined based on the side 18.
[0012]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the embodiments of the
present invention will be described specifically and in detail with reference to the drawings. FIG.
1 is a perspective view showing a small acoustic device according to an embodiment of the
present invention, FIG. 1 (a) is a perspective view seen from the top side, and FIG. 1 (b) is a
perspective view seen from the bottom side. FIG. 2 is an exploded perspective view of the case
main body 11, the adhesive member 21 and the separator 14 when the small acoustic device is
viewed from the bottom side.
[0013]
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As shown in these figures, the case body 11 of the small acoustic device has a disk shape, and
comprises a housing 13 with an open upper surface of a circular box shape and a lid 26 closing
the upper surface. In the inside of the storage body 13, a piezoelectric element is housed
although it is hidden and not seen. In this piezoelectric element, a piezoelectric ceramic layer is
formed on one side or both sides of a diaphragm made of, for example, a metal circular thin
plate, and an electrode is provided on the vibrator and the piezoelectric ceramic layer. By
applying a voltage to this electrode, electrostriction is caused in the piezoelectric ceramic layer,
and the diaphragm is vibrated to emit a sound. Alternatively, the diaphragm vibrates by sound,
and distortion caused thereby generates an electromotive force between the electrodes.
[0014]
At one end of the case main body 11, a box-shaped terminal holding portion 16 is protruded, and
a pair of terminals 25, 25 are attached thereto. The terminals 25 are respectively connected to
the electrodes of the piezoelectric element, and are connected to a circuit for driving the
piezoelectric element via the terminals 25. A rectangular protrusion is formed at a position where
the electric signal is opposed to the terminal holding portion 16 of the case main body 11, and
the end face of the protrusion is a flat reference surface 15. A sound output hole 26 is provided
in the lid 26 for closing the upper surface of the storage body 13 of the case main body 11.
Further, a sound output hole 12 is also provided on the bottom surface of the housing 13 shown
in FIG.
[0015]
A ring-shaped adhesive member 21 is attached to the bottom of the case body 11. The adhesive
member 21 can be formed, for example, by applying an adhesive to the bottom surface of the
case main body 11 in a ring shape, but in the example shown in FIG. Is used. Inside the adhesive
member 21 is a mesh member 22 such as Tetron, which covers the sound release hole 12 and
prevents dust and the like from entering the inside of the case body 11 from the outside of the
housing of the portable terminal. ing. The portion on the reference surface 15 side of the case
body 11 of the adhesive member 21 is partially cut, and the cut edge 23 is flush with the
reference surface 15 of the case body 11 or slightly inside the case body 11 It is intruding.
[0016]
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Further, a sheet-like separator 14 is attached to cover the adhesive member 21. The separator 14
has a surface that allows it to be relatively easily peeled off from the adhesive member 21 while
having a certain degree of adhesion to the adhesive member 21. One half of the separator 21 is
substantially circular, and the other half is a square having corners, and the respective parts are
integral. The circular side portion of the separator 21 is attached to the half of the case main
body 11 on the reference surface 15 side via the adhesive member 21, and the rectangular
portion is attached to the terminal holding portion 16 side of the case main body 11 via the
adhesive member 21. Be
[0017]
A part of the separator 14 on the reference surface 15 side is cut in a straight line, and the cut
edge 17 is flush with or slightly inward of the reference surface 15 of the case body 11. In the
example shown in FIG. 1, the cut edge 17 of the separator 14 has entered the inside of the case
body 11 from the reference surface 15 of the case body 11 by a margin m. The cut edge 17 of
the separator 14 and the cut edge 23 of the adhesive member 21 are aligned so as to match up
and down.
[0018]
The straight side edges 18 orthogonal to the edge 17 on the reference surface 15 side of the
separator 14 are parallel to each other, and project slightly outward from the outer edge of the
main surface of the case main body 11. In addition, the corner of the square portion of the
separator 14 protrudes the most from the outer periphery of the case body 11. In the example
shown in FIG. 1, the terminal holding portion 16 of the case main body 11 protrudes slightly
outward from the separator 14, but the separator 14 may completely cover the terminal holding
portion 16.
[0019]
FIGS. 3 and 4 show a state in which the small acoustic device attached with such a separator 14
is transported by the conveyor b. The small acoustic device transported by the conveyor b is
detected by the work sensor a at the position of the reference plane 15 of the case main body 11
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and is held by a robot manipulator (not shown) by the detected position. And transported to an
assembly position of a portable terminal or the like.
[0020]
As described above, since the edge 17 on the reference surface 15 side of the case body 11 of
the separator 14 is flush with the reference surface 15 or on the inner side of the case body 11
from the reference surface 15, the separator 14 is in the case body 11. It does not disturb the
positioning based on the reference surface 15. Therefore, the position of the case main body 11
conveyed by the conveyor b can be accurately detected by the work sensor a, and the small
acoustic device can be picked up correctly.
[0021]
In addition, since the separator 14 has both sides 18 parallel to each other orthogonal to the cut
edge 17, for example, as shown by a two-dot chain line in FIG. By guiding the case main body 11,
the case main body 11 is transported in a state in which the case main body 11 is in a
predetermined direction, that is, the reference surface 15 is directed in the advancing direction.
Thereby, the direction of the case main body 11 when the small acoustic device is transported by
the conveyor b is accurately controlled.
[0022]
For that purpose, the accuracy of the sticking position and angle of the separator 14 with respect
to the case main body 11 is required. In FIG. 5, the separator 14 indicated by a solid line has a
center line connecting the center of the reference surface 15 of the case body 11 and the
terminal holding portion 16 and a center line that is a straight line that is an intermediate portion
of both sides 18 of the separator 14. The separator 14 is in a state of being attached to the case
main body 11 in a state of exactly matching. On the other hand, the separator 14 shown by a
two-dot chain line in FIG. 5 shows a state in which the center line of the case main body 11 and
the center line of the separator 14 are stuck with a slight angle deviation. Of course, the
deviation between the center line of the case body 11 and the center line of the separator 14 is
preferably small. The deviation of this center line should be a maximum of ± 4 °.
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[0023]
As shown in FIGS. 3 and 4, after the small acoustic device transported by the conveyor b is
positioned by the work sensor a with reference to the reference surface 15 of the case main body
11, it is held by a robot manipulator (not shown) , And to an assembly position of a portable
terminal or the like. The separator 14 is peeled off from the case body 11 in the middle of this,
but since the corner of the square portion of the separator 14 largely protrudes from the outer
periphery of the case body 11, the separator 14 is removed from the case body 11 It can be
easily peeled off. After the separator 14 is peeled off, the case body 11 is attached to a
predetermined position of the housing of the portable terminal (not shown) by the adhesive
member 21 and incorporated into the portable terminal.
[0024]
As described above, the small acoustic device according to the present invention can accurately
position and pick up the small acoustic device conveyed by the conveyor in an automatic
incorporation line to a portable terminal or the like. In addition, the separator 14 can be easily
peeled off from the case body 11. Further, the direction at the time of transportation of the case
body 11 can also be accurately guided, whereby automatic incorporation of the small acoustic
device into a portable terminal or the like can be performed reliably and easily.
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