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JP2002191087

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2002191087
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducing unit incorporating electroacoustic transducing components such as a
microphone and a speaker, and relates to an effective technique applied to, for example, a
microphone unit of a portable telephone.
[0002]
2. Description of the Related Art FIG. 6 shows an axial sectional view of a conventional
microphone unit in which automatic assembly is considered. The microphone unit shown in the
figure has an elastic connector 43 electrically connected to the inner cylinder of the unit holder
40 to the electret microphone 41 as an electroacoustic conversion component and the output
terminal pad 42 formed on the surface of the electret microphone 41. And a connector housing
44 supporting the connector. The conventional elastic connector 43 is formed by bending the
spring steel plate in the upper and lower direction so as to form contact points on both the upper
and lower sides, and can elastically protrude from both the upper and lower surfaces of the
connector housing 44. One projecting portion is connected to the output terminal pad 42 of the
electret microphone 41 and is elastically retracted. The other protruding portion protrudes
outward of the unit holder 40 before assembly, but when incorporated into an electronic device
such as a portable telephone, a predetermined conductive pattern of the mounting substrate is
pressed against the protruding portion to electrically A connection is established.
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[0003]
SUMMARY OF THE INVENTION In consideration of the demand for miniaturization of a portable
information terminal represented by a portable telephone, the present inventor examined
reducing the thickness of an electroacoustic transducer unit such as a microphone unit. .
According to this, as in the conductive connection by the conventional elastic connector 43
illustrated in FIG. 6, in the structure of elastically supporting the connector with respect to both
the electroacoustic conversion component side and the mounting substrate side, the thickness It
has become clear that there is a limit to making That is, it is necessary to secure the thickness
dimension in consideration of the elastic deformation allowance of the connector for both the
front and back of the connector housing. The present inventor examined adopting the structure
for elastically supporting the connector only on the mounting substrate side in order to reduce
the elastic deformation margin, but in such a case, the conventional technique is also solderless
assembly and automatic in the first place The need for a new structure capable of conductively
connecting a connector to an electroacoustic transducer without problems in terms of solderless
assembly and automatic assembly has been clarified, as it is an optimal structure for assembly.
[0004]
An object of the present invention is to provide an electroacoustic transducing unit capable of
reducing the thickness dimension and electrically connecting the connector to the electroacoustic
transducing component without any problem in terms of solderless assembly and automatic
assembly.
[0005]
Another object of the present invention is to provide an electronic device that can be
miniaturized in terms of an electroacoustic conversion unit.
[0006]
The electro-acoustic conversion unit (1) according to the present invention is mounted on a unit
holder (2) and an inner cylindrical portion (3) of the unit holder, and the opening (6) of the unit
holder An electro-acoustic transducer (4) having a plurality of projecting external terminals (7)
with its tip end facing, and an elastic connector (28) conductively connected to the projecting
external terminals to support the inner cylinder of the unit holder A connector housing (5)
mounted on the electro-acoustic transducer component in an overlapping manner, and the elastic
connector has a bifurcated portion (34) at a base end portion and the projecting external
terminal is formed at the bifurcated portion Inserted and folded back from the middle to form an
acute-angled bent portion (35) so that the tip end portion can be elastically protruded from the
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opening of the unit holder and the base end portion and the bent portion are the inner cylinder
Located within That.
[0007]
According to the electro-acoustic conversion unit, since the structure for elastically supporting
the elastic connector is adopted only on the mounting substrate side, the overall thickness
dimension can be reduced.
At this time, since the structure for conductively connecting the elastic connector to the
electroacoustic transducer is realized by the insertion insertion connection between the
projecting external terminal and the forked portion of the elastic connector, it is optimum for
automatic assembly of the electroacoustic transducer unit. Allows for less assembly.
[0008]
The electro-acoustic conversion unit is most suitable for a microphone unit such as a portable
telephone in which an electret microphone is used as an electro-acoustic conversion component.
From the viewpoint of downsizing, the connector housing can have a thickness (A) in the
direction of being overlapped with the electro-acoustic transducer component in a range of 0.5
mm to 1.0 mm.
The unit holder can have a thickness dimension (B) of 1.5 mm or more and 3 mm or less in a
direction in which the unit holder is overlapped with the electro-acoustic transducer.
[0009]
An electronic device according to another aspect of the present invention includes the
electroacoustic conversion unit, and a mounting substrate having a conductive pattern on the
surface that contacts the elastic connector of the electroacoustic conversion unit, the elastic
connector being the conductive pattern. It adopts a structure in which it is pressed and
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electrically contacted. This contributes to the miniaturization of the electronic device in terms of
the electroacoustic conversion unit.
[0010]
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an axial sectional view of a
microphone unit which is an example of an electroacoustic transducer unit according to the
present invention. The microphone unit 1 shown in the figure includes, for example, a unit holder
2 made of rubber, and the inner cylindrical portion 3 of the unit holder 2 has an electret
microphone 4 as an electroacoustic conversion component and a connector housing 5.
[0011]
The electret microphone 4 has a plurality of projecting external terminals 7 whose tip end faces
the opening 6 of the unit holder 2. Although the electret microphone 4 is not particularly limited,
as illustrated in FIG. 2, it has a button-type microphone casing 11 and, from its front side, faces
the sound wave passage opening 12 and forms one pole of a capacitor. The projecting external
terminal 7 is used as an output terminal of the electroacoustic conversion signal by the
diaphragm 13, the back electrode 14 forming the counter electrode (the other electrode of the
capacitor) of the diaphragm 13 with a gap, and the diaphragm 13 and the back electrode 14. A
microphone circuit board 16 is provided. The diaphragm 13 has a metal film deposited on one
surface of a dielectric film, the metal film is fixed to the diaphragm ring 20, and the insulating
spacer 21 is fixed to the dielectric surface. The back electrode 14 is fitted and fixed substantially
concentrically to the inner step portion of the insulating ring 22. Proper wiring patterns are
formed on the front and back surfaces of the circuit board 16 for microphones, and circuit
elements 23 such as field effect transistors for impedance conversion are mounted on them, and
the protruding external terminal 7 is the circuit concerned It is inserted into and fixed to the
substrate 16. The back electrode 14 is connected to a predetermined wiring pattern of the
microphone circuit board 16 via the conductive connection ring 24 and the metal film of the
diaphragm 13 via the diaphragm ring 20 and the casing 11. .
[0012]
As shown in FIG. 1, the connector housing 5 supports the elastic connector 28 electrically
connected to the projecting external terminal 7 and is mounted on the electret microphone 4 in
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an overlapping manner on the inner cylindrical portion 3 of the unit holder 2. Ru. The connector
housing 5 has two grooves 29 for receiving the elastic connector 28 as shown in FIG. 3 showing
its planar structure, and has a through hole 30 of the projecting external terminal 7 on the
extension thereof. As is apparent from FIG. 1, two stepped portions 31 and 32 are formed on the
back surface, and the deeper stepped portion 31 is formed to be extended from the groove 29
and the elastic connector 28 is formed there. Be placed. A cover 33 is fitted and fixed to the
shallow stepped portion 32 so that the elastic connector 28 is sandwiched and fixed between the
deeper stepped portion 31 and the cover 33. Although not shown, a through hole communicating
with the through hole 30 is formed in the cover 33, and the projecting external terminal 7 is
insertable.
[0013]
The elastic connector 28 has a bifurcated portion 34 at its base end as illustrated in FIGS. 1 and
3 and the projecting external terminal 7 is inserted into the bifurcated portion 34 and is bent
back from an intermediate portion An acute-angled bent portion 35 is formed so that the tip end
portion can be elastically protruded from the opening 6 of the unit holder 2, and the forked
portion 34 and the bent portion 35 of the base end portion are in the inner cylinder 3. To
position. A state in which the protruding external terminal 7 is inserted into the forked portion
34 is illustrated in the perspective view of FIG. 4.
[0014]
FIG. 5 schematically shows the electro-acoustic conversion unit 1 incorporated in an electronic
device. The electronic device shown in the figure has a mounting substrate 37 on which circuit
components constituting a required electronic circuit are mounted. The electroacoustic
conversion unit 1 is also positioned as one circuit component. The electroacoustic conversion
unit 1 is fixed to a casing 39 of an electronic device such as a portable telephone, and the elastic
connector 28 is pressed from above on the predetermined conductive pattern 38 of the
mounting substrate 37 and elastically deformed against the pressing force. Thus, the conductive
pattern 38 is electrically contacted. Although not shown, the mounting substrate 37 is fitted or
fixed to the casing 39 at a position where the resilient connector 28 is in conductive contact with
the conductive pattern.
[0015]
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According to the electro-acoustic conversion unit 1, the structure for electrically connecting the
elastic connector 28 to the electret microphone 4 is realized by the insertion insertion
connection between the projecting external terminal 7 and the forked portion 34 of the elastic
connector 28, and the elastic connector Since the structure for elastically supporting 28 is
adopted only on the mounting circuit board side, the overall thickness dimension can be reduced.
The difference is clear in comparison with FIG.
[0016]
In terms of downsizing, the connector housing 5 can adopt a dimension of 0.5 mm or more and
1.0 mm or less as a thickness dimension A in a direction in which the connector housing 5 is
overlapped with the electro-acoustic transducer. The unit holder 2 can adopt a dimension of 1.5
mm or more and 3 mm or less as a thickness dimension B in a direction in which the unit holder
2 is overlapped with the electro-acoustic transducer component 4. Therefore, the electro-acoustic
conversion unit 1 is most suitable for a small microphone unit such as a portable telephone
which uses an electret microphone as an electro-acoustic conversion component.
[0017]
Employing the microphone unit 1 in an electronic device contributes to downsizing of the
electronic device.
[0018]
The structure for electrically connecting the elastic connector 28 to the electret microphone 4 is
realized by the insertion and connection of the projecting external terminal 7 and the forked
portion 34 of the elastic connector 28, so it is most suitable for automatic assembly of the
electroacoustic transducer unit 1. Yes, and enables solderless assembly.
That is, when automatically assembling the electroacoustic conversion unit 1, prepare the
connector housing 5 containing the unit holder 2, the electret microphone 4, and the elastic
connector 28, and insert the electret microphone 4 into the unit holder 2. The connector housing
5 may be inserted from above. At this time, the projecting external terminal 7 is inserted into the
forked portion through the through hole of the cover 33, the forked portion 34 of the elastic
connector, and the through hole 30 of the connector housing 5 to be conductively connected.
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[0019]
Although the invention made by the inventors of the present invention has been specifically
described based on the embodiments, it is needless to say that the present invention is not
limited thereto, and various modifications can be made without departing from the scope of the
invention.
[0020]
For example, the structure of the electret microphone as an electroacoustic conversion
component is not limited to the structure of FIG. 2 and can be appropriately modified.
The electroacoustic conversion component is not limited to the electret microphone, and may be
a speaker. In addition, the above-mentioned specific dimensions regarding the electro-acoustic
conversion unit mean an optimum range in the case of intending compactness while maintaining
the function and reliability as a microphone, and the present invention is not necessarily limited
to this. .
[0021]
According to the electro-acoustic transducer unit according to the present invention, since the
structure for elastically supporting the elastic connector is adopted only on the mounting
substrate side, the overall thickness dimension can be reduced.
[0022]
The structure for electrically connecting the elastic connector to the electroacoustic transducing
component is realized by the insertion insertion connection between the projecting external
terminal and the bifurcated portion of the connector, so it is most suitable for the automatic
assembly of the electroacoustic transducing unit. Make it possible.
[0023]
This can contribute to the miniaturization of the electronic device in terms of the electroacoustic
conversion unit.
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