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JP2002335592

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DESCRIPTION JP2002335592
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
small electroacoustic transducer used for electronic devices, and more particularly to a small
electroacoustic transducer suitable for installation in a storage space located above a liquid
crystal display of a mobile phone. .
[0002]
2. Description of the Related Art FIG. 3 is a structural view of a speaker in Conventional Example
1, and FIG. 3 (a) is a rear view. Band-shaped springs 31 are provided on both sides of the speaker
30 disclosed in Japanese Patent Application Laid-Open No. 11-136795 shown in the figure. The
contact point on the spring 31 is disposed on the longitudinal center line of the speaker 30 so
that the contact can be stabilized. Further, the dimension d of the bent portion of the spring 31
protrudes from the case of the speaker 30.
[0003]
(B) is a schematic view showing a state where the speaker is attached to the mobile phone, and
shows a state where the speaker 30 is installed in the storage space 7 located above the liquid
crystal display unit 6 of the mobile phone 5 . The speaker 30 in the figure shows the front. In
particular, since the width in the vertical direction of the storage space 7 is severe, when the
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speaker 30 is installed in the storage space 7, it is necessary to shorten the length in the vertical
direction of the speaker 30 as much as possible. However, in the conventional example 1, the
speaker 30 can not be installed unless the width of the storage space 7 in the longitudinal
direction is made extra by the dimension d of the bent portion of the spring 31.
[0004]
FIG. 4 is a structural view of an electro-acoustic transducer for a portable telephone in
Conventional Example 2, and (a) is a front view. The electro-acoustic transducer 40 for portable
telephones disclosed in Japanese Patent Application Laid-Open No. 2000-201396 shown in the
figure is a portable electro-acoustic conversion for portable telephones as the portable
telephones are reduced in size and weight, and the liquid crystal display screen is enlarged. In
consideration of the fact that the space occupied by the vessel is necessarily smaller, space
saving is achieved by changing the shape from circular to track. A terminal plate 41 is provided
on the right side of the mobile phone electro-acoustic transducer 40.
[0005]
(B) is a schematic view showing a state in which the electro-acoustic transducer for mobile phone
is attached to the mobile phone, and the electro-acoustic transducer 40 for mobile phone is
located above the liquid crystal display portion 6 of the mobile phone 5 The state of being
installed in the space 7 is shown. The electro-acoustic transducer 40 for a portable telephone in
the drawing is a diagram in which a cap having a sound hole 42 is attached. When the cellular
phone electroacoustic transducer 40 is installed in the storage space 7, it is preferable from the
viewpoint of reduction in size and weight that the longitudinal length of the cellular phone
electroacoustic transducer 40 be as short as possible. However, in the second prior art, in order
for the terminal board 41 to abut against the upper curved frame of the storage space 7, it is
necessary to widen the width in the vertical direction of the storage space 7.
[0006]
In the first prior art, the longitudinal direction of the spring 31 of the speaker 30 is the
longitudinal direction, and it protrudes from the case of the speaker 30 by the dimension d of the
bent portion. That portion is a dead space of the storage space 7 where the speaker 30 is
installed, which is an obstacle to space saving.
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[0007]
Further, in the second conventional example, the electroacoustic transducer 40 for a cellular
phone is made to be circular to track-shaped to cope with space saving, and in order to improve
the defect that the shape of the spring 31 is downward, It is. However, since the contour shape of
the upper part of the mobile phone 5 is rounded, there is a limitation in projecting the terminal
plate 41 in the lateral direction, which hinders downsizing.
[0008]
The present invention has been made in view of these points, and provides a space-saving type
small electroacoustic transducer having an improved spring mounting direction and mounting
method capable of coping with a narrow storage space of an electric device such as a mobile
phone. The purpose is
[0009]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the small-sized
electroacoustic transducer according to the present invention is a small-sized electroacoustic
transducer mounted in a narrow space of an electronic device such as a portable telephone. The
shape is a combination of the upper semicircle and the lower rectangle, the recess 12 is provided
on the left and right opposite sides of the lower rectangle, and the longitudinal direction of the
strip spring 11 serving as the input terminal connected to the acoustic output terminal of the
electronic device is It is characterized in that it is installed in the recess 12 so as to be parallel to
the bottom side of the lower rectangle, and the protrusion due to the radius of the spring 11
which is bent to the back side falls within the range of the recess 12.
[0010]
The small-sized electro-acoustic transducer according to the present invention is a small-sized
electro-acoustic transducer mounted in a narrow space of an electronic device such as a portable
telephone, and has an outer shape combined with an upper half-track shape and a lower
rectangle. The recess 22 is provided on the left and right opposite sides of the lower rectangle,
and the longitudinal direction of the strip-like spring 21 serving as an input terminal connected
to the sound output terminal of the electronic device is parallel to the base of the lower rectangle.
, And the projection by the radius of the spring 21 that is bent to the back side is within the
range of the recess 22.
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[0011]
Furthermore, in the small-sized electro-acoustic transducer according to the present invention,
the spring installed in the recess is shaped so as not to protrude outward from the bottom side,
and is mounted in the storage space 7 located above the liquid crystal display unit 6 of the
mobile phone 5 It is characterized in that it has a space-saving type shape suitable for use.
[0012]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The mounting direction of the
spring is changed from the conventional vertical direction to the horizontal direction to
correspond to the vertical width of the storage space 7 located above the liquid crystal display 6
of the portable telephone 5 .
Furthermore, the protrusion due to the radius of the bent portion of the spring installed in the
recess does not go out from the full width of the small electroacoustic transducer, and
corresponds to the width in the lateral direction of the storage space 7 to save space.
[0013]
An embodiment of the present invention will be described below with reference to the drawings.
[0014]
Example 1 FIG. 1 is a structural view of a compact electroacoustic transducer in Example 1 of the
present invention, in which (a) is a rear view, (b) is an AA 'cross section, and (c) is a BB' cross
section. A figure, (d) is a front view.
(E) is a schematic diagram which shows the state attached to the mobile telephone.
The external shape of the small-sized electroacoustic transducer 10 is a combination of a
semicircular shape and a rectangular shape, and the concave portion 12 is provided on the left
and right sides of the rectangular shape.
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The strip-shaped spring 11 is installed in the recess 12 so that the longitudinal direction is
parallel to the opposite side of the rectangle, and the protrusion due to the radius of the spring
11 bent on the back side fits within the range of the recess 12.
[0015]
The spring 11 is in the lateral direction so as to be parallel to the opposite side of the rectangle,
and the terminal having the function of the spring 11 is housed in the unit shape (semicircle +
rectangle), and the lower end of the spring 31 as in the prior art 1 Is prevented from protruding
outside, dead space is prevented from occurring, space saving, and miniaturization by this are
achieved.
Note that this space-saving structure can also cope with the width of the storage space 7 of the
mobile phone 5.
[0016]
Furthermore, in the conventional example 1, since the spring 31 has a shape projecting from the
central part to the lower part of the unit, the size of the spring 31 is long and the shape is large,
and thus expensive cost beryllium copper is used. In the present invention, the size of the spring
11 is made smaller than that of the conventional example 1 because the size of the spring 11 is
smaller than that of the conventional example 1. Therefore, the cost increase can be suppressed
even using beryllium copper. Also, upon assembly, the spring 11 can be bent into a U-shape to be
easily formed into a spring shape.
[0017]
In addition, since the terminal plate 41 does not protrude sideways as in the second related art,
the restriction in the width direction of the storage space 7 located above the liquid crystal
display unit 6 of the mobile phone 5 is not received.
[0018]
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(Embodiment 2) FIG. 2 is a structural view of a compact electroacoustic transducer according to
Embodiment 2 of the present invention, wherein (a) is a rear view, (b) is an AA 'cross section, and
(c) is a BB' cross section. A figure, (d) is a front view.
(E) is a schematic diagram which shows the state attached to the mobile telephone. The external
shape of the small-sized electroacoustic transducer 20 is a combination of a half-track shape and
a rectangle, and a recess 22 is provided on the left and right sides of the rectangle. The beltshaped spring 21 is disposed in the recess 22 so that the longitudinal direction of the stripshaped spring 21 is parallel to the bottom of the rectangle, and the protrusion due to the radius
of the spring 21 bent on the back side fits within the range of the recess 22.
[0019]
The external shape of the small-sized electroacoustic transducer 20 is a track shape, and is
smaller than that of the first embodiment, and is a shape suitable for mounting on a mobile
phone. The shape and material of the spring 21 and the advantages associated therewith are the
same as in the first embodiment. In the track-shaped embodiment, the space for providing the
receiver of the mobile phone is maximized and the component density is achieved.
[0020]
As described above, in the small-sized electroacoustic transducer according to the present
invention, the mounting direction of the spring is changed from the conventional longitudinal
direction to the lateral direction, and the protrusion due to the radius of the bent portion of the
spring is small-sized electroacoustic conversion Because it does not go out of the full width of the
device, it has a space-saving structure suitable for mounting electronic devices in a narrow space,
that is, mobile phone mounting.
[0021]
Brief description of the drawings
[0022]
1 is a structural view of a small electro-acoustic transducer in Example 1 of the present
invention, (a) is a rear view, (b) is a cross-sectional view of AA ', (c) is a cross-sectional view of
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BB', (d) is a front view FIG.
(E) is a schematic diagram which shows the state attached to the mobile telephone.
[0023]
2 is a structural view of the small-sized electro-acoustic transducer according to the second
embodiment of the present invention, (a) is a rear view, (b) is an AA 'sectional view, (c) is a BB'
sectional view, (d) is a front view FIG.
(E) is a schematic diagram which shows the state attached to the mobile telephone.
[0024]
3 is a structural view of the speaker in the prior art example 1, (a) is a rear view. (B) is a
schematic diagram which shows the state attached to a mobile telephone.
[0025]
4 is a structural view of a small-sized electro-acoustic transducer in the prior art example 2, (a) is
a front view. (B) is a schematic diagram which shows the state attached to a mobile telephone.
[0026]
Explanation of sign
[0027]
5 mobile phone 6 liquid crystal display 7 storage space 10 small size electroacoustic transducer
11 spring 12 recess 13 sound hole 20 small size electroacoustic transducer 21 spring 22 recess
23 sound hole 30 speaker 31 spring 32 contact point 40 electroacoustic transducer for mobile
phone 41 terminal board 42 sound hole
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