JP2002281589A - Electroacoustic transducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electroacoustic transducer capable of preventing the variation of the spring characteristic of coil springs or lowering of the reliability of a spring contact point by preventing sticking of soldering or flux to the coil springs constituting terminals. SOLUTION: A board 51 has a pair of terminals 61 and 71 arranged on the side of it one surface. These terminals 61 and 71 consist of the coil springs. These coil springs (terminals 61 and 71) include coil parts 62, 72 formed like coils and drawn parts 63 and 73 drawn to outside compared with the diameters of the coil parts 62 and 72. The end parts 63a and 73a of the parts 63 and 73 of the terminals 61 and 71 are formed bent nearly in the shape of L. The parts 63a and 73a of the parts 63 and 73 are put through to a through hole 54 formed at the part of the board 51 at a position where a terminal connecting part 52 is positioned and soldered to the part 52 on the side of the other surface of the board 51.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electro-acoustic transducer for converting an electric signal into sound, and more particularly to an electro-acoustic transducer having a terminal formed by a coil spring.

[0002]

2. Description of the Related Art As this type of electroacoustic transducer, for example, JP-A-11-313393, JP-A-2000-2
An electro-acoustic transducer as disclosed in Japanese Patent No. 70400 is known. In the electro-acoustic transducer disclosed in Japanese Patent Application Laid-Open No. H11-313393, an end of a coil spring constituting a terminal is formed by being drawn out in the direction in which the coil spring extends inside the outer diameter of the coil spring. The part is soldered to the lead frame inside the electro-acoustic transducer.

In the electro-acoustic transducer disclosed in Japanese Patent Application Laid-Open No. 2000-270400, the end turn of a coil spring constituting a terminal is attached to a surface of the substrate on the outside of the electro-acoustic transducer by soldering or the like. Have been.

[0004]

However, it has been found that the electroacoustic transducer having the above configuration has the following problems. During soldering, solder balls and flux may scatter and adhere to the coil spring, making the spring load of the coil spring unstable, making it impossible to properly press the coil spring (terminal) against the external substrate of various devices. is there. JP-A-11-313393
When soldering is performed inside the electro-acoustic transducer as in the electro-acoustic transducer disclosed in Japanese Unexamined Patent Application Publication No. H11-284, although the solder balls and the flux can be prevented from scattering and adhering to the coil spring, the end of the coil spring is Because it is formed by being drawn out in the direction in which the coil spring extends inside the outer diameter of the coil, molten solder or flux flows through the coil spring to the outside of the electro-acoustic transducer, and these may adhere to the coil spring. is there.

Further, the flux melts due to factors such as a high-temperature environment and aging, and flows through a coil spring to a compression contact portion for pressing against an external substrate, and adheres between the compression contact portion and the substrate. The reliability of the spring contacts may be impaired.

[0006] In the electroacoustic transducer having the above-described configuration, there is also a problem that the coil spring is easily detached by an external pull or impact.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to prevent solder and flux from adhering to a coil spring constituting a terminal, thereby preventing a change in spring characteristics of a coil spring and a decrease in reliability of a spring contact. It is an object of the present invention to provide an electroacoustic transducer capable of performing the following.

[0008]

An electroacoustic transducer according to the present invention is an electroacoustic transducer including a terminal constituted by a coil spring and a member having a terminal disposed on one side. , The terminal is a coil portion formed in a coil shape,
A drawer portion drawn out of the outer diameter of the coil portion; an end of the drawer portion is formed by bending; and a bent portion of an end of the drawer portion is provided with a terminal. And is electrically connected to a terminal connecting portion provided on the other surface side of the member by passing through a guide portion formed on the member.

[0009] In the electroacoustic transducer according to the present invention, the bent portion of the end of the lead-out portion of the terminal (coil spring) is connected to the terminal connection portion on the other surface side of the member on which the terminal is provided. Therefore, even when soldering is used as an electrical connection method, it is possible to prevent solder balls and flux from scattering and attaching to the terminals (coil portions) during soldering. In addition, since the draw-out portion is drawn out beyond the outer diameter of the coil portion, even if molten solder or flux flows through the draw-out portion of the terminal (coil spring) and flows into the outside of the electroacoustic transducer, Is very unlikely to flow into and adhere to the coil portion. Similarly, even when the flux is melted due to a high temperature environment, a change with time, or the like, the possibility that the melted flux flows into the coil portion and adheres to the coil is extremely low. As a result, it is possible to prevent solder and flux from adhering to the coil spring constituting the terminal, thereby preventing a change in the spring characteristics of the coil spring and a reduction in the reliability of the spring contact.

[0010] In the electroacoustic transducer according to the present invention,
Since the portion electrically connected to the terminal connection portion is a drawn portion drawn outside the outer diameter of the coil portion, resistance welding without using solder, diffusion bonding, or the like is used as an electrical connection method. Can be. As a result, since no solder is used, solder or flux does not adhere to the coil spring constituting the terminal, and it is possible to reliably prevent a change in the spring characteristics of the coil spring and a reduction in the reliability of the spring contact. When resistance welding is employed, it is necessary to dispose an electrode directly below a connection portion. However, in the electroacoustic transducer according to the present invention, a terminal (coil spring) extraction portion is connected to a terminal connection portion. In addition, the electrodes can be easily installed, and workability is improved. Further, even when diffusion bonding is employed, the workability is improved because the connecting portion is drawn out.

It is preferable that the end portion of the drawer portion is formed by further bending a portion that passes through the guide portion and is located on the other surface side of the member on which the terminal is provided. In such a configuration, when soldering is used as a method of electrical connection, the wet area of the solder increases, and the end of the lead-out portion of the terminal (coil spring) does not easily come off from the terminal connection portion. As a result, it is possible to prevent the terminal from being detached from the member on which the terminal is provided due to an external pull, impact, or the like.

Further, it is preferable that a portion of the drawer portion located on one side of the member is fixed to one surface of the member with an adhesive. With this configuration, when soldering is used as an electrical connection method, the flux that has melted due to factors such as a high-temperature environment and changes over time flows out of the electroacoustic transducer through the lead-out portion of the terminal. Even so, it will be blocked by the adhesive. Thereby, the possibility that the flux flows into and adheres to the coil portion can be further reduced.

[0013] Also, a pole piece having a protruding portion on one surface side, a coil disposed on the outer peripheral side of the protruding portion, a magnet disposed on the outer peripheral side of the coil, and a pole piece disposed on the other surface side of the pole piece. And a substrate as a member on which a terminal is provided on one side, a notch is formed on the outer periphery of the pole piece, and the terminal is provided at a position corresponding to the notch on the substrate. It is preferable that a connection portion is provided, and an end of the coil is electrically connected to the terminal connection portion. In such a configuration, when soldering is used as an electrical connection method, the end of the lead-out portion of the terminal (coil spring) is used as the terminal connection portion by utilizing the space defined by the cutout portion. Can be soldered,
The size and thickness of the electroacoustic transducer can be reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an electroacoustic transducer according to the present invention will be described below in detail with reference to the drawings. In the description, the same elements or elements having the same functions will be denoted by the same reference symbols, without redundant description.

First Embodiment First, a configuration of an electroacoustic transducer according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing the electro-acoustic transducer according to the first embodiment, FIG. 2 is a side view showing the same electro-acoustic transducer, and FIG. FIG. FIG. 4 is a sectional view taken along the line IV-IV in FIG.

The electroacoustic transducer T1 has a case 1 made of a thermoplastic resin as shown in FIGS. The case 1 includes a top plate 2 and a cylindrical portion 3. The top plate 2 has an opening 4 as a sound emission hole. In the case 1, a pole piece 11, a coil 21, a magnet 31, a resonance plate 41, a substrate 51, and the like are accommodated and arranged.

As shown in FIG. 4, the pole piece 11 has a substantially cylindrical protruding portion 12 and a disc-shaped base portion 1.
And 3. The protrusion 12 is located at the center of one surface of the base 13 and is formed integrally with the base 13. The pole piece 11 is made of a metal material (for example,
Permalloy). Notches 14 are formed at predetermined positions of the edge of the base portion 13 (in this embodiment, at three positions at equal intervals in the circumferential direction).

The coil 21 is formed by winding a conductive wire, and is disposed on the outer peripheral side of the protrusion 12. The coil 21 is fixed to the base 13 with an adhesive or the like. As the conductive wire, for example, a copper wire having a wire diameter of about 60 μm can be used.

The magnet 31 is made of an annular plastic magnet, and is arranged on the outer peripheral side of the coil 21 with a predetermined gap between the magnet 21 and the coil 21. The magnet 31 is mounted in contact with the base portion 13 of the pole piece 11, and the mounting position is regulated by abutting on the inner peripheral surface of the cylindrical portion 3 of the case 1. The magnet 31 has a notch 14 formed in the base 13.
An opening 32 is formed at a position corresponding to. Also,
A step 33 is formed in a portion of the magnet 31 facing the pole piece 11 at a position corresponding to an outer peripheral portion of the base portion 13 where the notch 14 is not formed.

A step 34 is formed on the magnet 31, and a resonance plate 41 (also referred to as a vibration plate or an elastic plate) is mounted on the step 34. In the present embodiment, the magnet 31 also functions as a support member that supports the resonance plate 41. At the center of the resonance plate 41,
A magnetic piece 42 as an additional mass is provided. Resonance plate 4
Numeral 1 is in the attracted state due to the action of the static magnetic field of the magnet 31, and is attracted to the magnet 31 side to be fixed. The upward movement of the resonance plate 41 is restricted by the top plate 2 of the case 1.

A back space is formed on the back side of the resonance plate 41. Further, a resonance space surrounded by the case 1 is formed on the upper surface side of the resonance plate 41. This resonance space is
The case 1 is open to the outside air through an opening formed in the top plate 2.

The substrate 51 has a pair of terminals 6 on one side.
1, 71 are provided. A pair of terminal connecting portions 52 are provided on the other surface of the substrate 51 (the back surface of the surface on which the terminals 61 and 71 are provided), to which the ends 22 of the conductive wires constituting the coil 21 are electrically connected. ing. The substrate 51 is fixed to the pole piece 11 with an adhesive or the like in a state where the other surface of the substrate 51 and the other surface of the base portion 13 of the pole piece 11 face each other. At this time, the terminal connection portion 5 is located at a position corresponding to the cutout portion 14 formed in the base portion 13.
The base portion 13 and the substrate 51 are positioned so that 2 is located. The substrate 51 is fixed to the inner peripheral surface of the cylindrical portion 3 of the case 1 with an adhesive 53.

As shown in FIGS. 5 and 6, the pair of terminals 61 and 71 are formed by coil springs.
The coil springs (terminals 61 and 71) include coil portions 62 and 72 formed in a coil shape and coil portions 62 and 72.
Drawn out portions 63, 73 drawn out of the outside diameter of
And Coil portions 62, 7 of terminals 61, 71
2 has a tapered shape whose diameter is reduced toward the tip. The tip end winding portions 62a of the coil portions 62, 72,
Reference numeral 72a functions as a compression contact portion that is pressed against an external board (not shown) of various devices. In the middle of the tapered coil portions 62 and 72, the reduction width of the winding diameter is set to a value larger than the wire diameter. This is because when compressed, the tip end turns 62a, 72a of the coil portions 62, 72
Is inserted inside the base end winding portions 62b and 72b so that the respective windings overlap in a direction orthogonal to the elastic displacement direction. With such a configuration, the compressed height at the time of mounting can be reduced to a small value, and the height of the electroacoustic transducer T1 in the mounted state can be kept low.

One terminal 61 is disposed such that its coil portion 62 is located substantially at the center of the substrate 51, and the other terminal 71 is located such that its coil portion 72 is located near the edge of the substrate 51. It is arranged as follows. By arranging the terminals 61 and 71 in this way, the electroacoustic transducer T1 can be
It can correspond to an external substrate having terminals having an ll's-eye structure.

The ends 63a, 73a of the lead portions 63, 73 of the terminals 61, 71 are formed by bending substantially L-shaped. End portions 63a, 73 of the drawer portions 63, 73
As shown in FIG. 4, the portion a formed by bending into a substantially L-shape is inserted into a through hole 54 (guide portion) formed in the portion of the substrate 51 where the terminal connection portion 52 is provided. It is inserted and soldered to the terminal connection part 52 on the other surface side of the substrate 51. At this time, the end portion 22 of the conductive wire forming the coil 21 is also soldered to the terminal connecting portion 52 together with the portions formed by bending the end portions 63a and 73a of the lead portions 63 and 73 into a substantially L shape.

The portions of the lead-out portions 63 and 73 located on one side of the substrate 51 are bonded to one side of the substrate 51 with an adhesive 81 (for example, an adhesive such as a silicone resin or epoxy resin). Is fixed. It is preferable to use a low-viscosity adhesive as the adhesive 81. By using such a low-viscosity adhesive, it is possible to suppress the height of the cured adhesive from being increased, and the external substrate and the adhesive 81 come into contact with each other, so that the compression of the terminals 61, 71 is not achieved. It is possible to prevent the terminals 61 and 71 from contacting with the external substrate while obtaining a desired contact force.

Next, the operation of the electroacoustic transducer T1 configured as described above will be described. Electroacoustic transducer T
1, the base portion 13, the protruding portion 12, the resonance plate 41
And the magnet 31 constitute a magnetic circuit.
1 acts on the resonance plate 41, and the magnetized resonance plate 41 is attracted to the iron core side. Magnet 31
Acts as a bias magnetic field on the resonance plate 41.

When an electric signal such as an alternating current or a pulse is applied between the terminals 61 and 71 to the unidirectional magnetic field formed by the static magnetic field, the signal current flows through the coil 21 and the projecting portion 12 An oscillating magnetic field is generated according to the signal. In a section where the direction of the oscillating magnetic field is opposite to the static magnetic field of the magnet 31, the resonance plate 41 oscillates in a direction away from the protruding section 12, and is attracted to the protruding section 12 in a section where the direction is the same as the static magnetic field. Such mechanical up-and-down movement depends on the frequency of the electric signal, and as a result, the resonance plate 41 vibrates, causing air to vibrate. This vibration is amplified as resonance sound in the resonance space. This sound is mainly emitted from the opening 4 to the outside.

As described above, in the electroacoustic transducer T1 according to the first embodiment, the ends 63a, 7 of the lead portions 63, 73 of the terminals 61, 71 formed by coil springs.
The portion formed by bending the substrate 3a into a substantially L shape is the substrate 5
1 and is soldered to the terminal connection portion 52 on the other surface side of the substrate 51, so that solder balls and flux are scattered at the time of soldering, and the coils of the terminals 61 and 71 are coiled. It can be prevented from adhering to the portions 62 and 72. In addition, drawer portions 63 and 73
Are drawn out of the outer diameters of the coil portions 62 and 72, so that the molten solder or flux
Even if it flows through the drawer portions 63 and 73 of the base 71 and flows into one side of the substrate 51, these flow into the coil portions 62 and 73.
The possibility of flowing into and adhering to 72 is extremely low. Also,
Similarly, even when the flux is melted due to a high-temperature environment, a change with time, or the like, the possibility that the melted flux flows into and adheres to the coil portions 62 and 72 is extremely low. As a result, according to the electro-acoustic transducer T1 according to the first embodiment, it is possible to prevent solder or flux from adhering to the coil springs forming the terminals 61 and 71, particularly to the coil portions 62 and 72, and to prevent the terminals 61 and 71 from adhering. , 71 (coil spring) and a decrease in the reliability of the spring contact can be prevented.

In the electroacoustic transducer T1 according to the first embodiment, as described above, the coil portions 62,
End portions 63 of the drawer portions 63 and 73 drawn out from 72
Since the portions formed by bending the terminals a and 73a into a substantially L shape are soldered to the terminal connecting portions 52 on the other surface side of the substrate 51, the terminals 61 and 7 formed by coil springs are provided.
As compared with the case where the end winding portion of 1 is directly fixed to one surface of the substrate 51, the end winding portion for fixing to the substrate 51 becomes unnecessary,
The height of the terminals 61 and 71 can be reduced, and the size and thickness of the electroacoustic transducer T1 can be reduced.

The portions of the lead-out portions 63 and 73 located on one surface side of the substrate 51 are fixed to one surface of the substrate 51 with an adhesive 81, so that factors such as a high-temperature environment, a change with time, etc. Flux melted by the terminals 61 and 7
1 through the drawer portions 63 and 73 of the electroacoustic transducer T
Even if it flows to the outside of 1, it will be blocked by the adhesive 81. Thereby, the possibility that the flux flows into and adheres to the coil portions 62 and 72 can be further reduced.

In the electroacoustic transducer T1 according to the first embodiment, the terminal connecting portion 52 is
Is provided in the substrate portion at a position corresponding to the notch portion 14 formed in the base portion 13 of
Even if the end portions of the members 3 and 73 and the solder protrude from the other surface of the substrate 51, the height of these portions will be absorbed by the space defined by the cutouts 14. Thereby, utilizing the space defined by the notch portion 14,
The end portions 63a of the lead portions 63, 73 of the terminals 61, 71,
The portion formed by bending the L-shaped portion 73a into a substantially L-shape can be soldered to the terminal connection portion 52, and the size and thickness of the electroacoustic transducer T1 can be reduced.

In the electroacoustic transducer T1 according to the first embodiment, the pole piece 11 of the magnet 31 is used.
Is formed at a position corresponding to the outer peripheral portion where the notch portion 14 of the base portion 13 is not formed, the height of the space defined by the notch portion 14 is formed. Is further increased by the height of the stepped portion 33, and the heights of the ends 63a and 73a of the drawn portions 63 and 73 protruding from the other surface of the substrate 51 and formed by bending the portions 63a and 73a into a substantially L shape and the solder portion Can be further absorbed.

Second Embodiment Next, referring to FIGS. 7 and 8, an electroacoustic transducer T according to a second embodiment of the present invention will be described.
2 will be described. FIG. 7 is a rear view showing the electro-acoustic transducer according to the second embodiment. FIG.
FIG. 8 is a sectional view taken along line VIII-VIII of FIG. The electroacoustic transducer T2 according to the second embodiment is different from the electroacoustic transducer T1 according to the first embodiment with respect to the shape of the end of the lead-out portion of the terminal.

The electroacoustic transducer T2 according to the second embodiment
7, a pair of terminals 161 and 171 are disposed on one side of the substrate 51, as shown in FIGS. These terminals 161 and 171 are shown in FIGS.
As shown in FIG. The coil springs (terminals 161, 171) include coil portions 162, 172 formed in a coil shape, and lead portions 163, 173 drawn outside the outer diameter of the coil portions 162, 172. Terminal 161, 1
The 71 coil portions 162, 172 are formed in a tapered shape with the diameter reduced toward the tip. Coil part 1
The tip end winding portions 162a and 162b of 62 and 172 function as compression contact portions that are pressed against external boards of various devices. In the middle part of the coil portions 162 and 172 formed in a tapered shape, as in the first embodiment, the reduction width of the winding diameter is set to a value larger than the wire diameter, and the coil portions 62 and 7 are formed.
The height of the electroacoustic transducer T2 in the mounted state is kept low by setting the compression height at the time of mounting 2 to a small value.

One terminal 161 is connected to its coil portion 16.
2 is disposed so as to be located substantially at the center of the substrate 51, and the other terminal 171 is disposed such that its coil portion 172 is located near the edge of the substrate 51. By arranging the terminals 161 and 171 in this way, the terminals 161 and 17 having the bull's-eye structure can be used for the electroacoustic transducer T2.
1 can be made compatible with the external substrate (various devices).

The lead-out portions 163, 163 of the terminals 161, 171
The ends 163a and 173a of the 173 are formed by being bent into a substantially L-shape. The end portions 163a and 173a of the lead portions 163 and 173, which are formed by bending in a substantially L-shape, are formed on the portion of the substrate 51 where the terminal connection portion 52 is provided, as shown in FIG. Is inserted through the through hole 54, and on the other surface side of the substrate 51,
It is soldered to the terminal connection part 52. At this time, the end portion 22 of the conductor forming the coil 21 is also connected to the lead portion 16.
The end portions 163a and 173a of the third and third members 173 are soldered to the terminal connection part 52 together with the substantially L-shaped bent portions.

Further, the lead portion 1 of the terminals 161 and 171
The end portions 163a and 173a of the through holes 54 and 63
Is formed on the other side of the substrate 51 by being bent into a substantially L-shape. As a result, the lead-out portions 163, 17 of the terminals 161, 171
The three end portions 163a and 173a are formed by being bent into a substantially crank shape. Note that the direction in which the portion to be inserted into the through hole 54 and located on the other surface side of the substrate 51 is further bent is not limited to the direction in which the drawer portion extends, as shown in FIGS. 9 and 10. The direction may intersect (for example, be orthogonal to) the direction in which the drawer extends. Also, the lead portion 1 of the terminals 161 and 171
The ends 163a and 173a of the 63 and 173 may be bent in a substantially U-shape.

As described above, also in the electroacoustic transducer T2 according to the second embodiment, as in the first embodiment,
By preventing solder and flux from adhering to the coil springs constituting the terminals 161 and 171, particularly the coil portions 162 and 172, it is possible to prevent a change in the spring characteristics of the terminals 161 and 171 (coil spring) and a reduction in the reliability of the spring contacts. it can.

In the electroacoustic transducer T2 according to the second embodiment, the ends 163a and 173a of the lead portions 163 and 173 of the terminals 161 and 171 are inserted into the through holes 54 and Since the portion to be located on the other surface side is further bent in a substantially L-shape, the wetted area of the solder increases, and the terminal 16
1,171 (the end 163 of the drawer portions 163, 173)
a, 173a) hardly comes off from the terminal connection portion 52. As a result, the terminals 161 and 171 are pulled from the outside,
Detachment from the substrate 51 due to impact or the like can be prevented.

The present invention is not limited to the embodiment described above. For example, in the second embodiment, the portions of the lead-out portions 163 and 173 located on one surface side of the substrate 51 are bonded to one surface of the substrate 51 with an adhesive (for example, a silicone resin-based resin) as in the first embodiment. , An epoxy resin adhesive or the like).

In the first embodiment, the terminals 61,
The bending angles of the end portions 63a, 73a of the lead portions 63, 73 of the 71 may be obtuse angles as shown in FIG. Further, the bending angles of the ends 63a, 73a of the lead portions 63, 73 of the terminals 61, 71 may be acute as shown in FIG. As described above, by setting the bending angles of the ends 63a, 73a of the lead portions 63, 73 of the terminals 61, 71 to obtuse or acute angles, the terminals 61, 7 are formed.
1 against the terminals 161 and 1 in the second embodiment.
The end portions 163a, 173 of the drawer portions 163, 173 of 71
An effect equivalent to that obtained by bending 3a into a substantially crank shape can be obtained.

In the second embodiment, the terminal 16
The end 163 of the drawer portion 163 of the 1,171
a, 173a is inserted into the through hole 54 and the substrate 51
The bending angle of a portion to be located on the other surface side may be an obtuse angle as shown in FIG. As described above, the terminals 161 and 171 are formed by making the bending angles of the portions inserted into the through holes 54 at the end portions 163a and 173a and positioned on the other surface side of the substrate 51 obtuse.
End portions 163a, 173a of the drawer portions 163, 173
Can be easily inserted into the through hole 54, and workability is improved.

In the second embodiment, the terminal 16
The end 163 of the drawer portion 163 of the 1,171
a, 173a is inserted into the through hole 54 and the substrate 51
The bending angle of the portion to be located on the other surface side may be an acute angle as shown in FIG. As described above, by making the bending angle of the portion inserted into the through hole 54 in the end portions 163a and 173a and located on the other surface side of the substrate 51 acute, the solder is connected to the end portion 163.
a, 173a is inserted into the through hole 54 and the substrate 51
Can be formed up to the portion to be located on the other surface side, and the fixing strength of the terminals 161 and 171 can be increased.

In the first and second embodiments, the lead-out portions 6 of the terminals 61, 71, 161, 171 are used.
End portions 63a, 73a, 16 of 3, 73, 163, 173
The through-hole 54 is formed in the substrate 51 as a guide through which the bent portions of 3a and 173a are passed. However, the present invention is not limited to this, and a notch is formed in the substrate 51 as a guide. It may be.

In the first and second embodiments, the lead-out portions 6 of the terminals 61, 71, 161, 171 are used.
End portions 63a, 73a, 16 of 3, 73, 163, 173
Although the terminals 3a and 173a are electrically connected to the terminal connection portions 52 of the substrate 51 by soldering, the present invention is not limited thereto, and the terminals may be electrically connected by resistance welding, diffusion bonding, or the like. . As described above, the end portions 63a, 7 of the lead portions 63, 73, 163, 173 of the terminals 61, 71, 161, 171 using resistance welding or diffusion bonding.
When the terminals 3a, 163a, and 173a are electrically connected to the terminal connecting portion 52, no solder is used.
Solder and flux do not adhere to the coil springs constituting the coil springs 71, 161, and 171. Therefore, a change in the spring characteristics of the coil spring and a decrease in the reliability of the spring contact can be reliably prevented. When resistance welding is employed, it is necessary to install an electrode directly below the connection portion, but the terminals 61, 71, 1
61, 171 drawer portions 63, 73, 163, 173
Since the end portions 63a, 73a, 163a, 173a are connected to the terminal connecting portions 52, the electrodes can be easily installed, and workability is improved. Also, even when diffusion bonding is adopted, since the connecting portion is drawn out,
Workability will be improved.

[0047]

As described above in detail, according to the present invention, it is possible to prevent solder and flux from adhering to the coil spring constituting the terminal, thereby changing the spring characteristics of the coil spring and reducing the reliability of the spring contact. Can be provided.

[Brief description of the drawings]

FIG. 1 is a front view showing an electroacoustic transducer according to a first embodiment of the present invention.

FIG. 2 is a side view showing the electroacoustic transducer according to the first embodiment of the present invention.

FIG. 3 is a rear view showing the electroacoustic transducer according to the first embodiment of the present invention.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a top view showing a terminal (coil spring) included in the electroacoustic transducer according to the first embodiment of the present invention.

FIG. 6 is a side view showing a terminal (coil spring) included in the electroacoustic transducer according to the first embodiment of the present invention.

FIG. 7 is a rear view showing an electroacoustic transducer according to a second embodiment of the present invention.

8 is a sectional view taken along the line VIII-VIII in FIG.

FIG. 9 is a top view illustrating a terminal (coil spring) included in the electroacoustic transducer according to the second embodiment of the present invention.

FIG. 10 is a side view showing a terminal (coil spring) included in the electroacoustic transducer according to the second embodiment of the present invention.

FIG. 11 is a sectional view showing a modification of the electroacoustic transducer according to the first embodiment of the present invention.

FIG. 12 is a cross-sectional view showing a modification of the electroacoustic transducer according to the first embodiment of the present invention.

FIG. 13 is a sectional view showing a modification of the electroacoustic transducer according to the second embodiment of the present invention.

FIG. 14 is a sectional view showing a modification of the electroacoustic transducer according to the second embodiment of the present invention.

[Explanation of symbols]

T1, T2 electroacoustic transducer, 1 case, 11 pole piece, 12 projecting portion, 13 base portion, 14 notch portion, 21 coil, 31 magnet, 41 resonance plate, 42 magnetism Piece, 51: substrate, 52: terminal connection part, 54
... Through holes (guide portions), 61, 71, 161, 171 ... Terminals, 62, 72, 162, 172 ... Coil portions, 63,
73, 163, 173... Drawer portions, 63a, 73a,
163a, 173a: end of drawn portion, 81: adhesive.

Claims (4)

[Claims] 1. An electro-acoustic transducer comprising: a terminal formed by a coil spring; and a member provided with the terminal on one side, wherein the terminal is a coil portion formed in a coil shape. And a drawn-out portion drawn outside the outer diameter of the coil portion. An end portion of the drawn-out portion is formed by bending, and a portion formed by bending the end portion of the drawn-out portion. Is passed through a guide portion formed on the member on which the terminal is provided, and is electrically connected to a terminal connection portion provided on the other surface side of the member. Sound transducer. 2. The end portion of the drawer portion is formed by further bending a portion that passes through the guide portion and is located on the other surface side of the member on which the terminal is disposed. The electroacoustic transducer according to claim 1, wherein: 3. A member positioned on one side of the member of the drawer portion is fixed to one side of the member with an adhesive.
An electroacoustic transducer according to item 1. 4. A pole piece having a protrusion on one surface side, a coil disposed on an outer peripheral side of the protrusion, a magnet disposed on an outer peripheral side of the coil, and the other surface of the pole piece. And a substrate as the member on which the terminal is disposed on one side, and a cutout portion is formed on the outer periphery of the pole piece; and the cutout is formed on the substrate. The said terminal connection part is provided in the position corresponding to a notch part, The end part of the said coil is electrically connected to the said terminal connection part, The claim 1 characterized by the above-mentioned. An electroacoustic transducer according to any one of the preceding claims.