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JP2002209003

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2002209003
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for
example, a speaker incorporated in a portable telephone and a portable terminal device using the
same.
[0002]
2. Description of the Related Art A portable telephone is one of the most typical portable terminal
devices of this type. The external dimensions of the portable telephone tend to be smaller, and
accordingly, the internal diameter of the built-in speaker is also required to be smaller and
thinner. However, there is a well-known problem that not only the sound quality relatively
deteriorates but also the sound volume becomes relatively smaller as the miniaturization and
thinning of the outer diameter of the speaker progress. For this reason, there has been a limit to
the miniaturization and thinning of the outer diameter of the speaker.
[0003]
Therefore, in the portable terminal device, a certain volume of space is required to accommodate
the speaker, which has been a factor that hinders the miniaturization of the portable terminal
device. . Moreover, in the portable terminal device, there is no space for disposing a speaker on
the front side of the device because it is necessary to concentrate the operation unit and the
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display unit on the front side of the device. For this reason, the speaker has to be disposed on the
back side of the device, and there is also a problem that the level of the sound pressure that the
user can actually hear is reduced.
[0004]
The present invention has been made in view of the above-described conventional problems, and
a first object is to miniaturize a portable terminal device. The second object is to prevent a drop
in the sound pressure level of the speaker that the user can actually hear.
[0005]
[Means for Solving the Problems] In order to achieve this object, the speaker according to claim 1
comprises a protrusion serving as a rocking fulcrum of the speaker unit and a signal for driving
the speaker unit on the back of the speaker unit. Is provided with a terminal formed of an
elastically deformable conductive material to be supplied, and an operating portion for operating
the switch means. Therefore, by pressing the edge on the front side of the speaker unit, the
speaker unit is swung with the projection as a swing fulcrum, and the switch means is operated
by the actuating portion.
[0006]
The invention according to claim 2 is the invention according to claim 1, wherein an air hole
through which the air in the speaker unit passes is provided in the working portion. Therefore,
an air hole is formed in the area which forms an operation part.
[0007]
In the invention according to claim 3, in the invention according to claim 1 or 2, positioning
means is provided on the outer peripheral portion of the speaker unit. Therefore, the mounting
position of the speaker unit is determined.
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[0008]
The invention according to claim 4 is the invention according to any one of claims 1 to 3,
wherein a sound hole is provided on the side surface of the speaker unit. Therefore, even if the
front of the speaker unit is closed with a finger, sound waves are emitted from the sound holes.
[0009]
According to a fifth aspect of the present invention, there is provided a portable terminal device
according to any one of the first to fourth aspects of the present invention, provided with a
speaker according to any one of the first to fourth aspects of the present invention. And a printed
wiring board. Therefore, pressing the end edge on the front side of the speaker causes the
speaker unit to swing with the protrusion as a swing fulcrum, and the switch unit is operated by
the actuating portion, and the terminal is elastically deformed by the terminal being deformed.
The electrical connection state with is maintained.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings. 1 is a cross-sectional view taken along the line II
in FIG. 5, FIG. 2 shows the speaker according to the present invention, FIG. 1 (a) is a perspective
view of the appearance viewed from the front side, and FIG. 1 (b) is the appearance viewed from
the back side FIG. FIG. 3 is a sectional view taken along the line III-III in FIG. 2A, and FIG. 4 is a
perspective view of a printed wiring board in a portable terminal device according to the present
invention. FIG. 5 is an exploded perspective view of the portable terminal device according to the
present invention.
[0011]
In FIG. 5, reference numeral 1 generally denotes a portable telephone as a portable terminal
device according to the present invention, which includes a front cover 2, a key sheet 3 formed
of a synthetic resin, and a speaker 4 according to the present invention. And a printed circuit
board 7 and a back cover (not shown). The front cover 2 includes an operation unit side housing
21 and a display unit side housing 22 which can be folded on the operation unit side housing 21
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via a hinge 23.
[0012]
The operation unit housing 21 is provided with 12 small rectangular button holes 24 arranged in
a matrix and a circular speaker exposure hole 25 positioned above the button holes 24. There is.
The display unit housing 22 is provided with a liquid crystal display unit 27 formed in a
rectangular shape and an earpiece 28 positioned above the liquid crystal display unit 27.
[0013]
Twelve dial buttons 31 are integrally projected on the key sheet 3 so as to be elastically
deformable in the thickness direction, and these dial buttons 31 are engaged with the button
holes 24 of the operation unit housing 21, It projects from the button hole 24. Above the dial
buttons 31, a speaker mounting hole 32 to which the speaker 4 is attached is provided, and at
the periphery of the speaker mounting hole 32, the height at which the speaker exposed hole 25
of the operation unit housing 21 is fitted is low. An elastically deformable small cylindrical body
33 is provided in a protruding manner. At the end of the small cylindrical body 33, a ring-shaped
retaining portion 34 is provided so as to protrude in the inward direction of the small cylindrical
body 33.
[0014]
Next, the speaker 4 which is a feature of the present invention will be described with reference to
FIGS. 2 and 3. In FIG. 2, the speaker 4 is formed by a known speaker unit 40, a protrusion 61
provided on the back side of the speaker unit 40, a pair of terminals 62 and 63, and four switch
pressing parts 65. The speaker unit 40 is roughly constituted by a frame 41 formed in a
substantially disc shape, a magnet 47 for generating magnetic flux, a voice coil 48 for passing an
electric current, and a diaphragm 53 directly connected to the voice coil 48 There is.
[0015]
The frame 41 is provided with a large diameter recess 42 on the front side, a small diameter
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recess 43 is provided at the center of the recess 42, and 12 bottoms of the large diameter recess
42 penetrate to the back side of the frame 41. Air holes 44 are provided at equal intervals in the
circumferential direction. 46 is a yoke for adjusting the direction of the magnetic flux passing
through the outside of the voice coil 48, and is formed in a shallow bowl shape so as to cover the
entire inner peripheral surface and the bottom of the small diameter recess 43.
[0016]
The magnet 47 is formed in a flat disk shape and is fixed at the center of the bottom of the yoke
46. A flat disk-shaped pole piece 49 is fixed on the magnet 47, and the pole piece 49 adjusts the
direction of the magnetic flux passing through the inside of the voice coil 48. A mesh-like baffle
51 covers the opening of the large diameter recess 42 and protects the diaphragm 53 disposed
in the space 52 formed between the baffle 51 and the recess 42. 55 is a signal line whose one
end is electrically connected to one end of the voice coil 48 and is embedded in the frame 41 and
the other end is led out from the back surface of the frame 41. Reference numeral 56 denotes a
signal line whose one end is electrically connected to the other end of the voice coil 48, and is
embedded in the frame 41, and the other end is led out from the rear surface of the frame 41.
[0017]
The speaker unit 40 described above is widely known conventionally, and there is no particular
difference from the prior art. The feature of the present invention is, as described above, that the
protrusion 61 as a rocking fulcrum, a pair of terminals 62 and 63, and four switch pressing parts
65 are provided on the back side of the speaker unit 40. It is in the point provided. That is, as
shown in FIG. 2 (b), a substantially hemispherical protrusion 61 is provided at the center of the
back surface of the frame 41.
[0018]
Further, terminals 62 and 63 to which the other ends of the above-described signal lines 55 and
56 are electrically connected are attached to the back surface of the frame 41, and these
terminals 62 and 63 are formed of a conductive material which can be elastically deformed. As
shown in FIG. 3, the height L is formed to be higher than the height l of the protrusion 61.
Further, as shown in FIG. 2B, at the peripheral portion of the back surface of the frame 41, four
flat disk-shaped operating portions 65 spaced at equal intervals in the circumferential direction,
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that is, 90.degree. It is provided. Four of the twelve air holes 44 described above are provided at
the centers of the four operating portions 65.
[0019]
Next, the printed wiring board 7 will be described with reference to FIGS. 1 and 4. As shown in
the figure, a pair of pads 71 and 72 are provided on the surface of the printed wiring board 7,
and four pads spaced at equal angles in the circumferential direction, that is, 90.degree. The tact
switch 75 is provided. As shown in FIG. 1, inner layer circuit patterns 73 and 74 electrically
connected to the pads 71 and 72 are embedded in the printed wiring board 7. As shown in FIG.
1, when the key sheet 3 is molded, the speaker 4 having such a configuration is fitted to the
small cylindrical body 33 of the key sheet 3 and the surface of the frame 41 is engaged with the
retaining portion 34 To be fixed.
[0020]
In such a configuration, as shown in FIG. 5, the dial button 31 of the key sheet 3 and the speaker
4 are respectively fitted in the button hole 24 and the speaker exposing hole 25 of the operation
unit side housing 21 of the front cover 2. Next, the printed wiring board 7 is fixed to the back
surface of the operation unit side housing 21, and the printed wiring board 7 and the key sheet 3
are held between the back cover and the operation unit side housing 21 which are not shown. In
the mobile phone 1 assembled in this manner, as shown in FIG. 1, the protrusion 61 abuts on the
printed wiring board 7 and the terminals 62 and 63 come in contact with the pads 71 and 72 of
the printed wiring board 7, And, the operating part 65 faces the tact switch 75 at a slight
interval. Further, a resonance space 80 communicating with the air hole 44 is formed between
the key sheet 3 and the printed wiring board 7.
[0021]
Next, the operation of the mobile phone having such a configuration will be described. In FIG. 1,
an installation-side signal such as voice or ringing tone of the mobile telephone 1 sent from the
inner layer circuit pattern 73 is sent via the pad 71 to the terminal 62 in contact with the pad 71
and sent. A signal flows through signal line 55 to one end of the coil forming voice coil 48. Also,
an electric signal such as voice or ringing tone of the cellular telephone device 1 sent from the
inner layer circuit 74 is sent to the terminal 63 in contact with the pad 72 via the pad 72, and
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the sent signal is a signal line Flow through 56 to the other end of the coil forming voice coil 48.
These signals flowed to the voice coil 48 drive the speaker 4 based on Fleming's law, that is, the
voice coil 48 vibrates and a sound wave is emitted from the diaphragm 53 directly connected
thereto. Further, at this time, the sound wave emitted from the diaphragm 53 resonates in the
resonance space 80 because the space 52 provided with the diaphragm 53 and the resonance
space 80 communicate with each other through the air hole 44 and are coupled. .
[0022]
Here, when a part of the retaining part 34 of the key sheet 3, that is, a part of the peripheral edge
on the front side of the speaker unit 40 is pressed in the direction of arrow A with a finger, the
key sheet 3 is slightly elastically deformed and the speaker unit 40 swings with the protrusion
61 as a swing fulcrum, so that the tact switch 75 to which one of the four actuating portions 65
faces is operated. At this time, even if the speaker unit 40 swings, the terminals 62 and 63 are
elastically deformed, so that the contact state between the terminals 62 and 63 and the pads 71
and 72 is maintained. It does not
[0023]
As described above, by causing the speaker 4 to function also as a switch unit for operating the
tact switch 75, the space in which the conventional speaker 4 is disposed is not necessary, so
that the mobile telephone 1 can be miniaturized. In addition, since a button for operating the tact
switch 75 is not necessary, the number of parts can be reduced. Further, since the speaker 4 can
be disposed on the front side of the operation unit side housing 21, the level of sound pressure
that the user can listen to can be improved. Further, by providing four of the twelve air holes 44
in the actuating portion 65, the region of the air holes 44 can be used as the region of the
actuating portion 65, so the area of the bottom of the frame 41 on which these are formed Can
be made small, so that the speaker 4 can be miniaturized.
[0024]
6 to 8 show a second embodiment of the present invention, and FIG. 6 is a perspective view of
the key sheet as viewed from the back side, and FIG. 7 (a) is a perspective view of the fastener as
viewed from the front side. FIG. 8 (b) is a perspective view of the fixture viewed from the back
side, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7 (a). In the second
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embodiment, the speaker 4 is not attached directly to the key sheet 3 at the same time as the key
sheet 3 is formed using the metal fitting, but is attached later via the fixing tool 90. It is
characterized by the point. That is, the fixing tool 90 is formed in a ring shape by an insulating
material, and a retaining portion 91 protruding in the center direction is provided at the
peripheral edge.
[0025]
As shown in FIG. 6, the fixing tool 90 is fitted and fixed to the speaker mounting hole 32 of the
key sheet 3, and the speaker 4 is fitted and fixed to the fixing tool 90 to attach the speaker 4 to
the key sheet 3. Thus, the speaker 4 is not exposed to the key sheet 3 at the same time as the key
sheet 3 is formed, but is attached after the key sheet 3 is formed, so that the speaker 4 is not
exposed to the high temperature at the time of molding Not only the deterioration of the speaker
4 can be prevented, but also the deformation of the key sheet 3 can be prevented.
[0026]
9 and 10 show a third embodiment of the present invention, and FIG. 9 (a) is a perspective view
of the speaker viewed from the front side, and FIG. 9 (b) is a perspective view of the speaker
viewed from the back side. Fig.10 (a) is the perspective view which looked the fixing tool from
the front side, FIG.10 (b) is the perspective view which looked the fixing tool from the back side.
In the third embodiment, a protrusion 411 for positioning is provided on a part of the peripheral
surface of the frame 41 of the speaker 4, and the protrusion 411 is fitted on a part of the inner
peripheral surface of the fixture 90. A recess 92 is provided.
[0027]
With such a configuration, the speaker 4 is attached to the printed wiring board 7 at a
predetermined position by positioning and assembling the speaker 4 with respect to the fixture
90. Therefore, the contact failure between the terminals 62 and 63 of the speaker 4 and the pads
71 and 72 of the printed wiring board 7 can be prevented, and the operation failure of the tact
switch 75 of the printed wiring board 7 by the operating portion 65 of the speaker 4 is
prevented. it can. Moreover, when assembling the speaker 4 to the key sheet 3, since the
positioning operation becomes unnecessary, the workability of assembly is improved.
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[0028]
FIG. 11 shows a fourth embodiment of the present invention. FIG. 11 (a) is a perspective view of
the speaker viewed from the front side, and FIG. 11 (b) is a perspective view of the speaker
viewed from the back side. In the fourth embodiment, a recess 412 for positioning is provided in
a part of the peripheral surface of the frame 41 of the speaker 4 and the recess 412 is formed in
a part of the inner peripheral surface of the fixture 90 which is not shown. A convex portion to
be fitted is provided.
[0029]
With such a configuration, the speaker 4 is positioned relative to the fixture 90 and assembled in
the same manner as in the third embodiment described above. Mounted in position. Therefore,
not only the contact failure between the terminals 62 and 63 of the speaker 4 and the pads 71
and 72 of the printed wiring board 7 can be prevented, but also the operation failure of the tact
switch 75 of the printed wiring board 7 by the operating portion 65 of the speaker 4 It can
prevent. Moreover, when assembling the speaker 4 to the key sheet 3, since the positioning
operation becomes unnecessary, the workability of assembly is improved.
[0030]
12 and 13 show a fifth embodiment of the present invention, and FIG. 12 (a) is a perspective
view of the speaker viewed from the front side, and FIG. 12 (b) is an XII (b) in FIG. FIG. 13 is a
cross-sectional view of the main part. In the fifth embodiment, a plurality of sound holes 413 are
provided on the front side of the outer peripheral portion of the frame 41, and these sound holes
413 are in communication with the space 52 in which the diaphragm 53 is provided. According
to such a configuration, when the front side of the speaker 4 is pressed with a finger, even if the
front side of the speaker 4 is blocked by a finger, sound waves are emitted from these sound
holes 413, so Can be prevented.
[0031]
Although the operation part 65 was formed in disk shape, it is not limited to this shape. Further,
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although the number of operating portions 65 is four, it may be made to correspond to the
number of contactor switches 75. Moreover, although the action | operation part 65 was arrange
| positioned at equal angles in the circumferential direction, it is not limited to this. Although the
speaker 4 is adopted in the mobile phone 1, it can be adopted in other mobile terminals. In this
case, since the speaker 4 is multifunctionalized, the added value of the speaker 4 is improved.
[0032]
As described above, according to the first aspect of the present invention, since the speaker can
also function as a switch, the added value of the speaker can be improved. In addition, since a
button for operating the switch means is not required, the number of parts can be reduced.
[0033]
Further, according to the invention of claim 2, since the air hole area can be used also as the
operation area, the area of the part where these are formed can be made small, and hence the
speaker can be miniaturized. be able to.
[0034]
Moreover, according to the invention which concerns on Claim 3, not only can prevent the
supply defect of the signal supplied via a terminal, and can also prevent the malfunction of the
switch means by an action | operation part.
In addition, since the operation for positioning the speaker is not necessary, the assembling
efficiency is improved.
[0035]
Moreover, according to the invention which concerns on Claim 4, the fall of a sound volume can
be prevented.
[0036]
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According to the fifth aspect of the present invention, the function of the speaker as a switch also
eliminates the need for the space in which the conventional speaker is disposed, thereby
achieving the downsizing of the portable terminal device.
In addition, since a button for operating the switch means is not required, the number of parts
can be reduced. In addition, since the speaker can be disposed on the front side of the device
body, the level of sound pressure that can be heard by the user can be improved.
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