JP2005057495

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DESCRIPTION JP2005057495
PROBLEM TO BE SOLVED: To provide an electroacoustic transducer in which a contact element
which can be disposed in a space-saving manner to a small electronic device and which can be
stably connected with a low load is integrated in a housing. SOLUTION: A stepped through hole 7
is provided in a resin case 5 for housing a magnet 2, a voice coil 3 and a diaphragm 4, and a
conductive head pin 8 and a coil spring 9 are provided in the stepped through hole 7. The
electro-acoustic transducer is characterized in that the conductive solder legs 10 are mounted in
order and the conductive solder legs 10 are attached, and the conductive wire 13 from the voice
coil 3 is connected to the conductive solder legs 10. It is preferable that the stepped through
holes 7 be configured in three stages. [Selected figure] Figure 2
Electro-acoustic transducer and connection element structure used therefor
[0001]
The present invention relates to an electroacoustic transducer (for example, a speaker, a receiver)
incorporated in a small electronic device, and more particularly to a connection structure
between a coil wire of a voice coil of the electroacoustic transducer and an electrode of a circuit
board of the small electronic device.
[0002]
As an electroacoustic transducer incorporated in a small electronic device, one using a spring
connector 21 as shown in FIG. 6 and FIG. 7 is known (see Patent Document 1).
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The spring connector 21 shown in Patent Document 1 comprises a movable pin 24 which is
pressed by a spring member 23 housed in a housing portion 22 and protrudes from the housing
portion 22 as shown in FIG. The connector 21 is soldered and fixed to the substrate member 25,
and the soldered substrate member 25 is attached to the speaker 26 (FIG. 6). Then, the movable
pin 24 of the spring connector 21 attached to the speaker 26 comes in contact with the
conductor portion (electrode) 28 of the printed circuit board 27 as shown in FIG. It is to connect.
[0003]
The conventional spring connector 21 is independent as a connector, and is used by being
soldered to the substrate member 25. Depending on these factors, it is difficult to meet the recent
demand for downsizing, thinning, and weight reduction. Utility model registration No. 3011621
gazette
[0004]
The problem to be solved by the present invention is, in view of the circumstances as described
above, a contact element which can be disposed in a space-saving manner to a compact
electronic device whose size is further reduced, and which enables stable connection with low
load An object is to provide an integrated electroacoustic transducer (speaker, receiver) and a
connection structure thereof.
[0005]
In the electro-acoustic transducer according to the present invention, a stepped through-hole is
provided in a resin housing that accommodates a magnet, a voice coil, and a diaphragm, and a
conductive head pin and a coil spring are fitted in the stepped through-hole in this order. Further,
a conductive solder leg is mounted, and a lead from the voice coil is connected to the conductive
solder leg.
The stepped through holes are preferably configured in three stages.
[0006]
According to the present invention, since it was possible to construct substantially the same
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effect as the conventional spring connector by utilizing the stepped through-hole provided in the
resin casing, the substrate member which has been regarded as essential conventionally The
number of parts is also reduced, and the number of steps for assembling etc. can be significantly
reduced, and further downsizing, thinning and weight reduction of small electric devices can be
achieved. It has become easier to respond to
[0007]
The present invention will be described in detail based on the drawings.
FIG. 1 is an external perspective view showing an embodiment of the electro-acoustic transducer
of the present invention. FIG. 2 is an exploded perspective view showing an embodiment of the
electroacoustic transducer of the present invention shown in FIG. FIG. 3 is a cross-sectional view
showing the contact element of the present invention. FIG. 4 is an external perspective view
showing another embodiment of the electroacoustic transducer of the present invention. FIG. 5 is
an exploded perspective view of another embodiment of the electroacoustic transducer of the
present invention shown in FIG.
[0008]
In FIG. 2 showing the electroacoustic transducer 1 (FIG. 1) according to an embodiment of the
present invention as an exploded perspective view, 2 is a magnet, 3 is a voice coil, 4 is a
diaphragm, and 14 is a cover. It is incorporated into the housing 5. In this embodiment, the resin
case 5 has a protrusion 6. A stepped through hole 7 is formed in the protrusion 6, and the
conductive head pin 8, the coil spring 9, and the conductive solder leg 10 are inserted into the
stepped through hole 7. The conductive head pin 8 has an enlarged diameter portion 11 and has
a spring coil engaging projection 12 at the end of the enlarged diameter portion 11. The
engagement of the enlarged diameter portion 11 of the conductive head pin 8 with the stepped
portion of the stepped through hole 7 prevents it from coming off. One end of the coil spring 9
engages the enlarged diameter portion 11 of the conductive head pin 8 and the spring coil
engaging projection 12. The conductive solder legs 10 form a bottomed cylindrical body. The
other end portion of the coil spring 9 is accommodated in the cylindrical body portion of the
conductive solder leg 10 and engaged with the bottomed portion thereof.
[0009]
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The conductive head pin 8 is pressed into contact with the electrode (not shown) of the wiring
substrate of the small electronic device by the resilient force of the coil spring 9. The contact end
of the conductive head pin 8 with the electrode of the wiring substrate may be flat, may be round
in a spherical shape, may be conical in a conical shape, or may be truncated in a truncated cone
shape or the like. It may be in the shape of a cone. The stepped through hole 7 can be a threestep stepped through hole as shown in FIG. In the case of three stepped through holes, the
conductive solder leg 10 is disposed at the largest diameter portion, and the conductive solder
leg 10 is positioned at the stepped portion. Then, the coil diameter of the coil spring 9 disposed
in the middle diameter portion can be made to correspond to the diameter of the middle
diameter portion, and the diameter can be made larger accordingly.
[0010]
The conductive head pin 8 can be made of an appropriate metal such as a copper alloy such as
copper or brass, an aluminum alloy, nickel or a nickel alloy. In order to enhance the conductivity,
it is desirable to plate the surface with good conductivity such as gold plating and copper plating
as necessary. The conductive solder leg 10 can be made of the same metal material as the
conductive head pin 8. If necessary, it can be plated in consideration of conductivity and
solderability. The coil spring 9 is formed into an approximately elastic coil having a substantially
cylindrical shape, for example, by winding a thin metal wire having a diameter of 30 to 200 μm,
preferably 50 to 100 μm, at an equal pitch (for example, 0.4 mm). .
[0011]
Examples of metal wires forming the coil spring include metal wires such as phosphor bronze,
copper, beryllium copper, spring steel, hard steel, stainless steel, piano wire, and metal wires
plated with gold on these metal wires. The conducting wire 13 from the voice coil 3 is bonded to
the outer surface of the bottom of the conductive solder leg 10 by soldering, adhesion with a
conductive adhesive, or the like. The magnet 2, the voice coil 3, the conductive head pin 8, the
coil spring 9, and the conductive wire 13 from the coil spring 9 are assembled to the resin case 5
and covered with a cover 14 as shown in FIG. , The electroacoustic transducer 1 of this invention
which has a protrusion part is completed. It is shown in FIG. 1 that the tip of the conductive head
pin 8 protrudes from the resin case 5 at the protruding portion 6. The protrusion 6 of the
electroacoustic transducer is effective for alignment at the time of assembly to a small electronic
device. The material of the resin case 5 is not particularly limited, and a normal engineering
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plastic is used.
[0012]
An electroacoustic transducer 15 according to another embodiment of the present invention is
shown in FIGS. 4 and 5. In an electroacoustic transducer 15 according to another embodiment of
the present invention, the resin casing 16 has a substantially circular shape and has no
protrusion. The stepped through holes 7 are provided at approximately the center position of the
circular resin casing 16 and at a position separated by an appropriate distance. In this
embodiment, since the electroacoustic transducer 15 has a circular shape as a whole, if the
electrodes of the wiring board of the small electronic device are snake-like electrodes, they can
be assembled regardless of the direction. The other members in the electro-acoustic transducer
15 according to the other embodiment of the present invention are basically the same as those in
the first embodiment, and therefore, are indicated by the same reference numerals. It is assumed
that the explanation is omitted.
[0013]
According to the present invention, since the number of parts is reduced, the number of
assembling steps and the like are significantly reduced, and further miniaturization, thinning, and
weight reduction of the small electronic device can be achieved. Very useful as a converter.
[0014]
It is an appearance perspective explanatory view showing one embodiment of the electroacoustic
transducer of the present invention.
FIG. 2 is an exploded perspective view of an embodiment of the electroacoustic transducer of the
present invention shown in FIG. 1; It is cross-sectional explanatory drawing which shows the
contact element of this invention. It is an appearance perspective explanatory view showing
other embodiments of the electroacoustic transducer of the present invention. FIG. 5 is an
exploded perspective view of another embodiment of the electroacoustic transducer of the
present invention shown in FIG. 3; It is explanatory drawing which shows the connection
structure of the conventional speaker and a printed circuit board. It is cross-sectional explanatory
drawing which shows the structure of the conventional spring connector.
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Explanation of sign
[0015]
1: (in one embodiment of the present invention) electroacoustic transducer 2: magnet 3: voice
coil 4: diaphragm 5: resin case 6: projecting portion 7: stepped through hole 8: conductive head
pin 9: coil Spring 10: conductive solder leg 11: enlarged diameter portion (of conductive head
pin) 12: spring coil engagement projection 13: conductive wire 14 (from voice coil) 14: cover 15:
(another embodiment of the present invention) ) Electro-acoustic transducer 16: resin housing
21: spring connector 22: housing part 23: spring member 24: movable pin 25: substrate member
26: speaker 27: printed circuit board 28: conductor (electrode)
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