Vehicle electroacoustic transducer and method for manufacturing a vehicle electroacoustic transducer

Abstract

To suppress the generation of faults such as peeling of a solder part.SOLUTION: An electroacoustic transducer for a vehicle, comprises: a vibration plate for generating a sound by being vibrated; a coil body that vibrates the vibration plate by which a power is conducted to the coil; a second terminal 50; and a distribution member 48. The second terminal 50 constructs one part of a current path between coil bodies, in which one side includes an engagement concave part to be opened. The distribution member 48 constructs the other one part of the current path between the coil bodies, and includes: an engaged part 52 engaged to the engagement concave part, and a bent part 54 bent to the engaged part 52. An inner peripheral surface of the engaged part 52 and the engagement concave part is bonded via a main bonding part of a solder part 58. At least one part of the bent part 54 and the second terminal 50 are bonded via a sub-bonding part 58B of the solder part 58.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a vehicle electric acoustic transducer and a method for manufacturing the vehicle electric acoustic transducer.

Background Art

[0002] Patent Document 1 below discloses an acoustic device mounted on a vehicle. The acoustic device described in this document includes a bobbin around which a coil is wound and a vibrating body fixed to the bobbin. When current is passed through the coil, the vibrating body vibrates.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a vehicle electric acoustic transducer mounted on a vehicle like the acoustic device described in Patent Document 1 above, vibrations associated with the running of the vehicle are input. This vibration is also input to the soldered portions that electrically join the components constituting the vehicle electric acoustic transducer. Therefore, from the viewpoint of ensuring the electrical reliability of the vehicle electric acoustic transducer, it is important to suppress the occurrence of problems such as peeling of the soldered portions. Further, in a vehicle electric acoustic transducer provided outside the vehicle cabin, higher durability is required compared to a device provided inside the vehicle cabin, so it is required to further suppress the occurrence of problems such as peeling of the soldered portions.

[0005] In consideration of the above facts, an object of the present invention is to obtain a vehicle electric acoustic transducer and a method for manufacturing the vehicle electric acoustic transducer that can suppress the occurrence of problems such as peeling of the soldered portions.

Means for Solving the Problems

[0006] The vehicle electroacoustic transducer according to the first aspect includes a diaphragm that generates sound by vibrating, a bobbin to which the diaphragm is fixed, and a coil formed along the bobbin. A coil body that vibrates the diaphragm when the coil is energized, a terminal having a locking recess with one side open that constitutes part of the current path between the coil body, a wiring member having a locked portion that is locked to the locking recess and a bent portion that is bent with respect to the locked portion, and a soldering portion having a main joint portion that joins the locked portion and the inner peripheral surface of the locking recess, and a sub-joint portion that joins at least a part of the bent portion and the terminal. The vehicle electroacoustic transducer is provided outside the vehicle compartment.

[0007] According to the vehicle electroacoustic transducer of the first aspect, energization of the coil is performed via the terminal and the wiring member, which are the wiring paths. Thereby, the diaphragm vibrates to generate sound. Here, the soldering portion that connects the terminal and the wiring member includes a main joint portion that joins the locked portion of the wiring member and the inner peripheral surface of the locking recess of the terminal. In addition to this, the soldering portion includes a sub-joint portion that joins at least a part of the bent portion of the wiring member and the terminal. By configuring the soldering portion to have the sub-joint portion in addition to the main joint portion in this way, it is possible to suppress the occurrence of problems such as peeling of the soldering portion.

[0008] The vehicle electroacoustic transducer according to the second aspect is the vehicle electroacoustic transducer according to the first aspect, wherein the sub-joint portion is formed in a shape that widens toward the tip of the wiring member.

[0009] According to the vehicle electroacoustic transducer of the second aspect, the sub-joint portion of the soldering portion is formed in a shape that widens toward the tip of the wiring member. By configuring in this way, it is possible to secure the volume of the sub-joint portion.

[0010] The vehicle electroacoustic transducer according to the third aspect is the vehicle electroacoustic transducer according to the second aspect, wherein the bent portion is bent toward the side opposite to the opening direction of the locking recess. Thereby, the bent portion can be joined to a portion on the side opposite to the opening direction of the locking recess at the terminal via the secondary joint portion.

[0011] The method for manufacturing a vehicle electroacoustic transducer according to the fourth aspect is applied to the method for manufacturing a vehicle electroacoustic transducer according to any one of the first to third aspects, and includes a wiring member locking step of locking the locked portion to the locking recess, a wiring member bending step of forming the bent portion by bending a part of the wiring member with the locking recess as a fulcrum, and a soldering step of forming the main joint portion and the secondary joint portion by attaching molten solder to the inside and the periphery of the locking recess at the terminal.

[0012] According to the method for manufacturing a vehicle electroacoustic transducer according to the fourth aspect, by going through the above-described wiring member locking step, wiring member bending step, and soldering step, a soldered portion having a secondary joint portion in addition to the main joint portion can be formed. Thereby, it is possible to suppress the occurrence of problems such as peeling of the soldered portion.

Advantages of the Invention

[0013] The vehicle electroacoustic transducer according to the present invention has an excellent effect of being able to suppress the occurrence of problems such as peeling of the soldered portion.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

BEST MODE FOR CARRYING OUT THE INVENTION

[0015] With reference to FIGS. 1 to 6, a vehicle electroacoustic transducer 10 according to an embodiment of the present invention will be described. The vehicle electroacoustic transducer 10 of the present embodiment is mounted in a power unit room as the outside of the vehicle compartment, and an example of a vehicle approach notification device (AVAS: Acoustic Vehicle Alerting System) that generates a sound during low-speed driving to notify pedestrians of the approach of the vehicle will be described. Note that the front side and the rear side of the vehicle electroacoustic transducer 10 are indicated by an arrow FR and an arrow RR, respectively. Further, hereinafter, when simply indicating the front-rear direction, unless otherwise specified, it indicates the front-rear direction of the vehicle electroacoustic transducer 10. The front-rear direction of the vehicle electroacoustic transducer 10 coincides with the front-rear direction of the vehicle in a state where the vehicle electroacoustic transducer 10 is mounted on the vehicle.

[0016] As shown in FIG. 1, the vehicle electroacoustic transducer 10 includes a main baffle 12 formed in a box shape, and a front cover 14 and a rear cover 16 respectively attached to the front portion and the rear portion of the main baffle 12. Further, the vehicle electroacoustic transducer 10 includes a sound emitter body 18 supported by the main baffle 12 while being disposed inside the main baffle 12.

[0017] The main baffle 12 includes a base cylinder portion 12A formed in a substantially rectangular tube shape, and a partition wall 12B that separates the space inside the base cylinder portion 12A in the front-rear direction. A circular first through hole 12C is formed at the center of the partition wall 12B. This first through hole 12C is configured to be blocked by a diaphragm 32 described later. Further, a second through hole 12D having an inner diameter set smaller than that of the first through hole 12C is formed in the partition wall 12B. This second through hole 12D is configured to be blocked by a plug 20. Also, the main baffle 12 includes a connector connection portion 12E that protrudes from the outer peripheral portion of the base cylinder portion 12A toward the outside of the base cylinder portion 12A. An external connector (not shown) is to be connected to this connector connection portion 12E.

[0018] The front cover 14 includes a front cover main body 14A formed in a rectangular shape when viewed from the front-rear direction, and a plurality of locking claw portions 14B that protrude from the front cover main body 14A toward the main baffle 12 side. A plurality of slits 14C for transmitting the sound generated by the diaphragm 32 described later to the front side of the front cover main body 14A are formed in the front cover main body 14A. Also, the plurality of locking claw portions 14B are configured to be locked to the main baffle 12. And by locking the plurality of locking claw portions 14B to the main baffle 12, the front cover 14 is configured to be attached to the main baffle 12.

[0019] The rear cover 16 includes a rear cover main body 16A formed in a rectangular shape when viewed from the front-rear direction, and a plurality of locking claw portions 16B that protrude from the rear cover main body 16A toward the main baffle 12 side. A T-nut 22 is fixed to the rear cover main body 16A. And by screwing a bolt (not shown) into the T-nut 22, the vehicle electric acoustic transducer 10 is configured to be fixed to the vehicle. Also, the plurality of locking claw portions 16B are configured to be locked to the main baffle 12. And by locking the plurality of locking claw portions 16B to the main baffle 12, the rear cover 16 is configured to be attached to the main baffle 12.

[0020] The sound generator body 18 includes a frame 24, a magnetic circuit section 26 supported by the frame 24, a coil body 28 disposed within the frame 24, a damper 30 provided between the coil body 28 and the frame 24, and a diaphragm 32 fixed to the coil body 28.

[0021] The frame 24 is formed in a substantially stepped cylindrical shape with the front side opening wider than the rear side. The front opening of this frame 24 is configured to be closed by the diaphragm 32 described later.

[0022] The magnetic circuit section 26 applies a magnetic field to the coil body 28 described later. The magnetic circuit section 26 includes a yoke 34 formed in a bottomed cylindrical shape, a disc-shaped magnet 36 fixed to the bottom surface of the yoke 34, and a disc-shaped top plate 38 laminated on the magnet. The yoke 34 and the top plate 38 are formed using a soft magnetic material. The yoke 34 opens toward the front side and is provided so as to close the rear opening of the frame 24. A gap is formed between the magnet 36 and the top plate 38 and the yoke 34, and a part of the coil body 28 described later is disposed in this gap.

[0023] The coil body 28 is configured to include a bobbin 40 formed in a cylindrical shape and a coil 42 formed along the bobbin 40. The diaphragm 32 described later is fixed to the front end of the bobbin 40. The coil 42 is formed by winding a conductive wire 44 linearly formed using a conductive material along the bobbin 40. A pair of terminal portions 44A of the wire 44 forming the coil 42 are respectively connected to a pair of first terminals 46 (see FIG. 2) described later.

[0024] The damper 30 is formed in a disc shape with an opening formed at the radially central portion and has a corrugated shape that repeatedly curves in the front-rear direction along the radial direction. The coil body 28 is inserted through the opening formed at the central portion of the damper 30. The inner peripheral portion of the damper 30 is locked to the bobbin 40 of the coil body 28, and the outer peripheral portion of the damper 30 is locked to the frame 24.

[0025] The diaphragm 32 is formed in a circular shape when viewed from the front-rear direction and is formed in a shape that is concave and curved on the front side. An edge portion 32A made of an elastic material such as rubber is provided over the entire circumference on the outer peripheral portion of the diaphragm 32. The outer peripheral portion of the edge portion 32A is joined to the frame 24 over its entire circumference.

[0026] Next, the configuration of the wiring path between the coil 42, which is a main part of this embodiment, and an external connector (not shown) will be described.

[0027] As shown in FIG. 2, the wiring path between the coil 42 and an external connector (not shown) is configured to include a pair of first terminals 46, a pair of wiring members 48, and a pair of second terminals 50.

[0028] The first terminal 46 is formed by subjecting a conductive metal plate to pressing or the like. A part of this first terminal 46 is embedded in the frame 24 and is thus supported by the frame 24. One end portion on one side of the first terminal 46 is a first locking piece portion 46A that protrudes rearward from the frame 24. A locking recess 46B with an open rear side is formed in the first locking piece portion 46A. The pair of terminal portions 44A of the conductive wire 44 forming the coil 42 are locked in the respective locking recesses 46B of the pair of first terminals 46 while being disposed therein. Further, the pair of terminal portions 44A of the conductive wire 44 forming the coil 42 and the first locking piece portions 46A of the pair of first terminals 46 are joined via a soldering portion (not shown). Also, the other end portion of the first terminal 46 is a second locking piece portion 46C that is exposed from the frame 24. A circular locking hole 46D is formed in the second locking piece portion 46C.

[0029] The wiring member 48 is formed of a hard copper wire that is harder than the conductive wire 44 forming the coil 42. Here, as the wiring member 48, any member that can maintain the bent shape when bent may be used. For example, it can be a hard copper wire, a phosphor bronze wire, a soft copper wire, or the like. One end portion 48A of one side of the pair of wiring members 48 is inserted into a locking hole 46D formed in a second locking piece portion 46C of the pair of first terminals 46. Further, one end portion 48A of one side of the pair of wiring members 48 and the second locking piece portion 46C of the pair of first terminals 46 are joined via a soldering portion (not shown). Also, the other end portions 48B of the pair of wiring members 48 are respectively connected to a pair of second terminals 50 described later.

[0030] The second terminal 50 as a terminal is formed by subjecting a conductive metal plate to pressing or the like, similar to the first terminal 46. A part of this second terminal 50 is embedded in the main baffle 12 and thus supported by the main baffle 12. As shown in FIG. 3, one end portion of the second terminal 50 is a locking piece portion 50A that protrudes rearward from the main baffle 12. Here, one side in the thickness direction and one side in the width direction of the locking piece portion 50A are indicated by arrow T and arrow W. Note that the thickness direction T and the width direction W of the locking piece portion 50A are orthogonal to each other, and the thickness direction T and the width direction W of the locking piece portion 50A are orthogonal to the front-rear direction. A locking recess 50B with an open rear side is formed at the center in the width direction W of the locking piece portion 50A. The rear end side of the inner peripheral surface of this locking recess 50B is an expanding surface S1 set such that the dimension in the width direction W gradually increases as it goes rearward. Also, a portion on the inner peripheral surface of the locking recess 50B that is on the front side of the expanding surface S1 and has a dimension in the width direction W set to a constant dimension at each position in the vertical direction is a steady surface S2. The dimension in the width direction W between these steady surfaces S2 is set to be the same as or slightly larger than the wire diameter of the wiring member 48. The inner peripheral surface of the locking recess 50B and the bottom surface of the locking recess 50B are a locking surface S3. The locking surface S3 is curved in a U shape with an open rear side when viewed from the thickness direction T of the locking piece portion 50A. That is, the expanding surface S1, the steady surface S2, and the locking surface S3 constitute the inner peripheral surface of the locking recess 50B. Note that the locking recess 50B is not limited to a U shape and may be formed, for example, in a V shape.

[0031] Although not shown in the figure, the other end portion of the second terminal 50 is a connection piece portion disposed within the connector connection portion 12E (see FIG. 1) of the main baffle 12. Then, when an external connector (not shown) is connected to the connector connection portion 12E, an external connector terminal within the external connector (not shown) and the connection piece portions of the pair of second terminals 50 are connected.

[0032] Here, as shown in FIG. 3, at the other end portion 48B of the wiring member 48, the portion engaged with the engaging recess 50B will be referred to as the engaged portion 52. Also, at the other end portion 48B of the wiring member 48, the portion extending from the engaged portion 52 to one side in the thickness direction T of the engaging piece portion 50A of the second terminal 50 will be referred to as the bent portion 54. The boundary portion between the engaged portion 52 and the bent portion 54 at the other end portion 48B of the wiring member 48 is a bent portion 56 bent toward the front side. By having this bent portion 56, the bent portion 54 is in a posture inclined toward the front side with respect to the engaged portion 52.

[0033] As shown in FIGS. 4 and 5, the other end portion 48B of the wiring member 48 and the engaging piece portion 50A of the second terminal 50 are joined by a soldering portion 58. More specifically, as shown in FIG. 4, the engaged portion 52 of the wiring member 48 is arranged along the engaging surface S3 of the engaging recess 50B. And the engaged portion 52, the engaging surface S3 of the engaging recess 50B, and the stationary surface S2 are joined by the soldering portion 58. Here, the portion of the soldering portion 58 that joins the engaged portion 52, the engaging surface S3 of the engaging recess 50B, and the stationary surface S2 will be referred to as the main joining portion 58A.

[0034] As shown in FIG. 5, a portion 54A on the engaged portion 52 side in the bent portion 54 of the wiring member 48 and a surface S4 on one side in the thickness direction T of the engaging piece portion 50A of the second terminal 50 and a portion 50C adjacent to the engaging recess 50B are joined by the soldering portion 58. Here, the portion of the soldering portion 58 that joins the portion 54A on the engaged portion 52 side in the bent portion 54 of the wiring member 48 and the surface S4 on one side in the thickness direction T of the engaging piece portion 50A of the second terminal 50 and the portion 50C adjacent to the engaging recess 50B will be referred to as the sub-joining portion 58B. The shape of the sub-joining portion 58B as viewed from the width direction W of the engaging piece portion 50A is a fan shape that gradually widens toward the front side. Note that the shape of the sub-joining portion 58B is not limited to a fan shape. The shape of the sub-joining portion 58B may be appropriately set in consideration of the shape and posture of the bent portion 54 of the wiring member 48 and the like.

[0035] Further, a portion 54B on the side of the bent portion 54 of the wiring member 48 opposite to the locked portion 52 is separated from the locking piece portion 50A of the second terminal 50 in a state where the sub-joint portion 58B of the soldering portion 58 is not attached.

[0036] Next, a process of joining the other end portion 48B of the wiring member 48 and the locking piece portion 50A of the second terminal 50, which is a part of the manufacturing process of the vehicle electroacoustic transducer 10, will be briefly described.

[0037] First, as shown in FIG. 6, the locked portion 52 of the wiring member 48 is locked to the locking recess 50B of the second terminal 50 (wiring member locking process). In this wiring member locking process, the locked portion 52 of the wiring member 48 is arranged along the locking surface S3 of the locking recess 50B of the second terminal 50. Next, with the locking surface S3 of the locking recess 50B of the second terminal 50 as a fulcrum, a part of the wiring member 48 is bent forward from the position indicated by the two-dot chain line to form the bent portion 54 (wiring member bending process). Next, as shown in FIGS. 4 and 5, the main joint portion 58A and the sub-joint portion 58B of the soldering portion 58 are formed by attaching the melted solder to the inside and the periphery of the locking recess 50B of the second terminal 50 (soldering process). Through the above processes, the other end portion 48B of the wiring member 48 and the locking piece portion 50A of the second terminal 50 are joined via the soldering portion 58.

[0038] (Operations and Effects of this Embodiment) Next, the operations and effects of this embodiment will be described.

[0039] As shown in FIGS. 1 and 2, in the vehicle electroacoustic transducer 10 of this embodiment, energization of the coil 42 of the coil body 28 is performed via a pair of first terminals 46, a pair of wiring members 48, and a pair of second terminals 50, which are wiring paths. Thereby, as the coil body 28 moves in the front-rear direction, the diaphragm 32 vibrates to generate sound.

[0040] Here, as shown in FIG. 4, in the vehicle electro-acoustic transducer 10 of the present embodiment, the soldering portion 58 that joins the other end portion 48B of the wiring member 48 and the locking piece portion 50A of the second terminal 50 includes a main joining portion 58A that joins the locked portion 52 of the wiring member 48 and the locking surfaces S3 and the stationary surface S2 of the locking recess 50B of the second terminal 50. In addition to this, as shown in FIG. 5, the soldering portion 58 includes a sub-joining portion 58B that joins the portion 54A on the locked portion 52 side in the bent portion 54 of the wiring member 48 and the surface S4 on one side in the thickness direction T of the locking piece portion 50A of the second terminal 50 and the portion 50C adjacent to the locking recess 50B. By configuring the soldering portion 58 to have the sub-joining portion 58B in addition to the main joining portion 58A in this way, it is possible to suppress the occurrence of problems such as peeling of the soldering portion 58.

[0041] Also, in the vehicle electro-acoustic transducer 10 of the present embodiment, the bent portion 54 of the wiring member 48 is in a posture inclined toward the front side, and the sub-joining portion 58B of the soldering portion 58 is formed in a fan shape that spreads as it goes toward the front side. By configuring it in this way, the volume of the sub-joining portion 58B can be ensured. Thereby, a conduction path between the wiring member 48 and the second terminal 50 can be ensured.

[0042] Also, in the vehicle electro-acoustic transducer 10 of the present embodiment, the portion 54B on the side opposite to the locked portion 52 in the bent portion 54 of the wiring member 48 is separated from the locking piece portion 50A of the second terminal 50 in a state where the sub-joining portion 58B of the soldering portion 58 is not attached. By configuring it in this way, it is possible to suppress the sub-joining portion 58B of the soldering portion 58 from having a shape different from the fan shape.

[0043] In the above-described embodiment, an example has been described in which the portion 54B of the bent portion 54 of the wiring member 48 on the side opposite to the locked portion 52 is separated from the locking piece portion 50A of the second terminal 50 in a state where the sub-joint portion 58B of the soldering portion 58 is not attached. However, the present invention is not limited to this. For example, the entire bent portion 54 of the wiring member 48 may be configured to be joined to the locking piece portion 50A of the second terminal 50 via the sub-joint portion 58B of the soldering portion 58.

[0044] Also, in the above-described embodiment, an example has been described in which the bending direction of the bent portion 54 is bent in a direction opposite to the opening direction of the locking recess 50B. However, the present invention is not limited to this, and the bent portion 54 may be bent in other directions.

[0045] As described above, one embodiment of the present invention has been described. However, the present invention is not limited to the above, and it goes without saying that various modifications other than the above can be made and implemented within the scope not departing from the gist of the present invention.

Explanation of Reference Numerals

[0046] 10 Vehicle electric acoustic transducer 28 Coil body 32 Diaphragm 40 Bobbin 42 Coil 48 Wiring member 50 Second terminal (terminal) 50B Locking recess 52 Locked portion 54 Bent portion 58 Soldering portion 58A Main joint portion 58B Sub-joint portion

Claims

1. A diaphragm that generates sound by vibrating, a bobbin to which the diaphragm is fixed, and a coil formed along the bobbin, and a coil body that vibrates the diaphragm when the coil is energized, a terminal that constitutes a part of the current path between the coil body and has a locking recess with one side open, a wiring member that constitutes another part of the current path between the coil body and has a locked portion locked to the locking recess and a bent portion bent with respect to the locked portion, a soldering portion having a main joint portion that joins the locked portion and the inner peripheral surface of the locking recess and a sub-joint portion that joins at least a part of the bent portion and the terminal, A vehicle electroacoustic transducer provided outside the vehicle compartment, The bent portion is formed by the wiring member having a bent portion, At least a part of the bent portion and one side surface in the thickness direction of the locking piece portion where the locking recess is formed and the portion adjacent to the locking recess are joined by the sub-joint portion, Vehicle electroacoustic transducer.

2. The vehicle electroacoustic transducer according to claim 1, wherein the sub-joint portion is formed in a shape that widens toward the tip of the wiring member.

3. The vehicle electroacoustic transducer according to claim 1 or claim 2, wherein the bent portion is bent toward the side opposite to the opening direction of the locking recess.

4. The inner peripheral surface of the locking recess is a stationary surface, a locking surface that is the bottom surface of the locking recess, including, The locking surface is curved in a U shape when viewed from the thickness direction of the locking piece portion, The locked portion of the wiring member is arranged close to the locking surface such that the outer peripheral surface of the locked portion follows the surface curved in a U shape of the locking surface, The main joint portion joins the locked portion and the locking surface and the stationary surface of the locking recess, The vehicle electroacoustic transducer according to claim 3.

5. Applied to the manufacturing method of the vehicle electroacoustic transducer according to any one of claims 1 to 4, a wiring member locking step of locking the locked portion to the locking recess, a wiring member bending step of forming the bent portion by bending a part of the wiring member with the locking recess as a fulcrum, a soldering step of forming the main joint portion and the sub-joint portion by attaching molten solder to the inside and the periphery of the locking recess in the terminal, A manufacturing method of a vehicle electroacoustic transducer having.

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