JP2023146288A - Electroacoustic transducer for vehicle and manufacturing method of the electroacoustic transducer for the vehicle - Google Patents

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

The present invention relates to an electroacoustic transducer for a vehicle and a method for manufacturing the electroacoustic transducer for a vehicle.

Patent Document 1 listed below discloses an audio 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 the coil is energized, the vibrating body vibrates.

JP 2021-29003 Publication

Incidentally, vibrations accompanying the running of the vehicle are input to a vehicle electroacoustic transducer mounted on a vehicle, such as the acoustic device described in Patent Document 1. This vibration is also input to the soldering part that electrically joins the components that make up the vehicle electroacoustic transducer. Therefore, from the viewpoint of ensuring the electrical reliability of the electroacoustic transducer for a vehicle, it is important to suppress the occurrence of defects such as peeling of the soldered portion. In addition, since electroacoustic transducers for vehicles installed outside the vehicle are required to be more durable than devices installed inside the vehicle, it is possible to further suppress the occurrence of defects such as peeling of soldered parts. Desired.

The present invention has been made in consideration of the above facts, and an object of the present invention is to provide an electroacoustic transducer for a vehicle and a method for manufacturing the electroacoustic transducer for a vehicle, which can suppress the occurrence of defects such as peeling of soldered parts.

The electroacoustic transducer for a vehicle according to a 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 that forms part of a current path between the coil body and has a locking recess with one side open; and the coil Wiring that forms another part of the current path between the body and has a locked part that is locked in the locking recess and a bent part that is bent with respect to the locked part. Soldering comprising a member, a main joint part that joins the locked part and the inner circumferential surface of the locking recess, and a sub-joint part that joins at least a part of the bent part and the terminal. It is provided outside the vehicle interior.

According to the first aspect of the electroacoustic transducer for a vehicle, the coil is energized via the terminal and the wiring member, which are the wiring path. This causes the diaphragm to vibrate and generate sound. Here, the soldering part that connects the terminal and the wiring member includes a main joint part that joins the locked part of the wiring member and the inner peripheral surface of the locking recess of the terminal. In addition, the soldering section includes a sub-joining section that joins at least a portion of the bent section of the wiring member and the terminal. In this way, by configuring the soldering part to have the sub-joining part in addition to the main joining part, it is possible to suppress the occurrence of defects such as peeling of the soldering part.

A second aspect of the vehicular electroacoustic transducer is the vehicular electroacoustic transducer of the first aspect, in which the sub-junction is formed in a shape that widens toward the tip of the wiring member.

According to the second aspect of the electroacoustic transducer for a vehicle, the sub-joint portion of the soldering portion is formed in a shape that widens toward the tip of the wiring member. With this configuration, the volume of the sub-junction can be secured.

In the electroacoustic transducer for a vehicle according to a third aspect, in the electroacoustic transducer for a vehicle according to the second aspect, the bent portion is bent toward a side opposite to the opening direction of the locking recess. . Thereby, the bent portion can be joined to a portion of the terminal opposite to the opening direction of the locking recess via the sub-joint portion.

The method for manufacturing an electroacoustic transducer for a vehicle according to the fourth aspect is applied to the method for manufacturing the electroacoustic transducer for a vehicle according to any one of the first to third aspects, and the method includes: a wiring member locking step of locking the wiring member in the locking recess, a wiring member bending step of forming the bent portion by bending a part of the wiring member using the locking recess as a fulcrum, and melted solder. and a soldering step of forming the main joint part and the sub-joint part by attaching the material in and around the locking recess of the terminal.

According to the method for manufacturing an electroacoustic transducer for a vehicle according to the fourth aspect, by performing the above wiring member locking step, wiring member bending step, and soldering step, the sub-joint portion is provided in addition to the main joint portion. A soldering part can be formed. Thereby, it is possible to suppress the occurrence of defects such as peeling of the soldered portion.

The electroacoustic transducer for a vehicle according to the present invention has an excellent effect of suppressing the occurrence of problems such as peeling of soldered parts.

FIG. 1 is an exploded perspective view showing the electroacoustic transducer for a vehicle according to the present embodiment. It is a perspective view showing the inside of the electroacoustic transducer for a vehicle in a state where the rear cover side is cut along a direction orthogonal to the front-rear direction. FIG. 3 is an enlarged perspective view showing the vicinity of the locking piece of the second terminal; FIG. 4 is a diagram showing a cross section of the wiring member cut along the line 4-4 shown in FIG. 3, and a locking piece of the second terminal. It is a figure which shows the wiring member, the locking piece part, etc. of a 2nd terminal. It is a figure which shows the wiring member bending process.

An electroacoustic transducer 10 for a vehicle according to an embodiment of the present invention will be described using FIGS. 1 to 6. The vehicle electroacoustic transducer 10 of this embodiment is mounted in a power unit room outside the vehicle interior, and generates sound during low-speed driving to notify pedestrians of the approach of a vehicle (AVAS). An example of using Alerting System) is explained below. Note that the front side and the rear side of the vehicle electroacoustic transducer 10 are indicated by arrows FR and RR, respectively. In addition, hereinafter, when simply indicating a front-rear direction, unless otherwise specified, the front-rear direction of the vehicle electroacoustic transducer 10 is indicated. The front-rear direction of the vehicle electroacoustic transducer 10 corresponds to the front-rear direction of the vehicle when the vehicle electroacoustic transducer 10 is mounted on the vehicle.

As shown in FIG. 1, the electroacoustic transducer 10 for a vehicle includes a main baffle 12 formed in a box shape, and a front cover 14 and a rear cover 16 attached to the front and rear parts of the main baffle 12, respectively. ing. Further, the electroacoustic transducer 10 for a vehicle includes a sound generator body 18 that is disposed within the main baffle 12 and supported by the main baffle 12 .

The main baffle 12 includes a base cylindrical portion 12A formed in a substantially rectangular cylindrical shape, and a partition wall 12B that partitions a space within the base cylindrical portion 12A in the front-rear direction. A circular first through hole 12C is formed in the center of the partition wall 12B. This first through hole 12C is closed by a diaphragm 32, which will be described later. Further, a second through hole 12D is formed in the partition wall 12B and has an inner diameter smaller than that of the first through hole 12C. This second through hole 12D is closed by a plug 20. The main baffle 12 also includes a connector connecting portion 12E that protrudes from the outer peripheral portion of the base tube portion 12A toward the outside of the base tube portion 12A. An external connector (not shown) is connected to this connector connection portion 12E.

The front cover 14 includes a front cover main body 14A formed in a rectangular shape when viewed from the front and rear directions, and a plurality of locking claws 14B protruding from the front cover main body 14A toward the main baffle 12 side. A plurality of slits 14C are formed in the front cover body 14A to transmit sound generated by a diaphragm 32, which will be described later, to the front side of the front cover body 14A. Further, the plurality of locking claw portions 14B are configured to be locked to the main baffle 12. The front cover 14 is attached to the main baffle 12 by the plurality of locking claws 14B being locked to the main baffle 12.

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 claws 16B protruding from the rear cover main body 16A toward the main baffle 12 side. A T-shaped nut 22 is fixed to the rear cover main body 16A. Then, by screwing a bolt (not shown) into the T-shaped nut 22, the vehicle electroacoustic transducer 10 is fixed to the vehicle. Further, the plurality of locking claw portions 16B are configured to be locked to the main baffle 12. The rear cover 16 is attached to the main baffle 12 by the plurality of locking claws 16B being locked to the main baffle 12.

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, and a damper 30 provided between the coil body 28 and the frame 24. , and a diaphragm 32 fixed to the coil body 28.

The frame 24 is formed into a substantially stepped cylindrical shape, and has a larger opening on the front side than on the rear side. The front opening of the frame 24 is closed by a diaphragm 32, which will be described later.

The magnetic circuit section 26 applies a magnetic field to a coil body 28, which will be described later. The magnetic circuit section 26 includes a yoke 34 formed in a cylindrical shape with a bottom, 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. ing. The yoke 34 and the top plate 38 are formed using a soft magnetic material. The yoke 34 opens toward the front and is provided to close an opening on the rear side 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 a coil body 28, which will be described later, is arranged in this gap.

The coil body 28 includes a cylindrical bobbin 40 and a coil 42 formed along the bobbin 40. A diaphragm 32, which will be described later, is fixed to the front end of the bobbin 40. The coil 42 is formed by winding a conductive wire 44 formed into a linear shape using a conductive material along the bobbin 40 . A pair of terminal portions 44A of the conducting wire 44 forming the coil 42 are respectively connected to a pair of first terminals 46 (see FIG. 2), which will be described later.

The damper 30 is formed in the shape of a disk with an opening formed in the center in the radial direction, and is also formed in a wave-like shape that is repeatedly curved in the front-rear direction along the radial direction. The coil body 28 is inserted through an opening formed in the center of the damper 30. The inner peripheral part of the damper 30 is locked to the bobbin 40 of the coil body 28, and the outer peripheral part of the damper 30 is locked to the frame 24.

The diaphragm 32 is formed in a circular shape when viewed from the front and back direction, and is also formed in a shape that is curved concavely on the front side. An edge portion 32A made of an elastic material such as rubber is provided around the entire outer circumference of the diaphragm 32. The outer circumferential portion of the edge portion 32A is joined to the frame 24 over its entire circumference.

Next, the configuration of the wiring route between the coil 42, which is a main part of this embodiment, and an external connector (not shown) will be explained.

As shown in FIG. 2, the wiring path between the coil 42 and an external connector (not shown) includes a pair of first terminals 46, a pair of wiring members 48, and a pair of second terminals 50.

The first terminal 46 is formed by pressing a conductive metal plate. The first terminal 46 is supported by the frame 24 by being partially embedded in the frame 24. One end of the first terminal 46 is a first locking piece 46A that projects rearward from the frame 24. A locking recess 46B whose rear side is open is formed in the first locking piece 46A. The pair of terminal portions 44A of the conducting wire 44 forming the coil 42 are disposed within the respective locking recesses 46B of the pair of first terminals 46 and are locked in the locking recesses 46B. Further, the pair of terminal portions 44A of the conducting 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). Further, the other end of the first terminal 46 is a second locking piece 46C exposed from the frame 24. A circular locking hole 46D is formed in the second locking piece 46C.

The wiring member 48 is formed using a hard copper wire that is harder than the conducting wire 44 forming the coil 42. Here, the wiring member 48 may be any material as long as it can maintain its bent shape when bent, and may be, for example, a hard copper wire, a phosphor bronze wire, an annealed copper wire, or the like. One end 48A of the pair of wiring members 48 is inserted into a locking hole 46D formed in a second locking piece 46C of the pair of first terminals 46. Further, one end portion 48A 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). Further, the other end portions 48B of the pair of wiring members 48 are respectively connected to a pair of second terminals 50, which will be described later.

The second terminal 50 as a terminal is formed by press working or the like on a conductive metal plate, similarly to the first terminal 46. This second terminal 50 is supported by the main baffle 12 by being partially buried in the main baffle 12. As shown in FIG. 3, one end of the second terminal 50 is a locking piece 50A that projects 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 an arrow T and an arrow W. The thickness direction T and the width direction W of the locking piece 50A are perpendicular to each other, and the thickness direction T and the width direction W of the locking piece 50A are perpendicular to the front-rear direction. A locking recess 50B whose rear side is open is formed in the center of the locking piece 50A in the width direction W. The rear end side of the inner circumferential surface of the locking recess 50B is a widened surface S1 whose dimension in the width direction W gradually increases toward the rear side. Furthermore, a portion of the inner circumferential surface of the locking recess 50B whose dimension in the width direction W on the front side of the widened surface S1 is set to a constant dimension at each position in the vertical direction serves as a steady surface S2. The dimension in the width direction W between the stationary 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 serve as 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 widened surface S1, the steady surface S2, and the locking surface S3 constitute the inner circumferential 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.

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

Here, as shown in FIG. 3, the portion of the other end 48B of the wiring member 48 that is locked in the locking recess 50B will be referred to as a locked portion 52. Further, at the other end 48B of the wiring member 48, a portion extending from the locked portion 52 to one side in the thickness direction T of the locking piece portion 50A of the second terminal 50 is referred to as a bent portion 54. I'll decide. The boundary between the locked portion 52 and the bent portion 54 at the other end 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 inclined toward the front side with respect to the locked portion 52.

As shown in FIGS. 4 and 5, the other end 48B of the wiring member 48 and the locking piece 50A of the second terminal 50 are joined by a soldered portion 58. More specifically, as shown in FIG. 4, the locked portion 52 of the wiring member 48 is arranged along the locking surface S3 of the locking recess 50B. The locked portion 52 and the locking surface S3 and steady surface S2 of the locking recess 50B are joined by a soldering portion 58. Here, in the soldering portion 58, the portion where the locked portion 52 is joined to the locking surface S3 and the steady surface S2 of the locking recess 50B will be referred to as a main joint portion 58A.

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

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

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

First, as shown in FIG. 6, the locked portion 52 of the wiring member 48 is locked in the locking recess 50B of the second terminal 50 (wiring member locking step). In this wiring member locking step, 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, a bent portion 54 is formed by bending a part of the wiring member 48 forward from the position indicated by the two-dot chain line using the locking surface S3 of the locking recess 50B of the second terminal 50 as a fulcrum. (wiring member bending process). Next, as shown in FIGS. 4 and 5, melted solder is applied in and around the locking recess 50B of the second terminal 50, so that the main joint 58A and the sub-joint of the soldering part 58 are bonded. A portion 58B is formed (soldering process). Through the above steps, the other end 48B of the wiring member 48 and the locking piece 50A of the second terminal 50 are joined via the soldering part 58.

(Actions and effects of this embodiment)
Next, the operation and effects of this embodiment will be explained.

As shown in FIGS. 1 and 2, in the electroacoustic transducer 10 for a vehicle according to the present embodiment, a pair of first terminals 46 and a pair of wiring members 48 whose wiring path is used to energize the coil 42 of the coil body 28 and a pair of second terminals 50. As a result, as the coil body 28 moves in the front-back direction, the diaphragm 32 vibrates and generates sound.

Here, as shown in FIG. 4, in the vehicle electroacoustic transducer 10 of this embodiment, the other end 48B of the wiring member 48 and the locking piece 50A of the second terminal 50 are joined by solder. The attachment portion 58 includes a main joint portion 58A that joins the locked portion 52 of the wiring member 48 to the locking surface S3 and steady surface S2 of the locking recess 50B of the second terminal 50. In addition, as shown in FIG. 5, the soldering portion 58 has a thickness at a portion 54A of the bent portion 54 of the wiring member 48 on the locked portion 52 side and the locking piece portion 50A of the second terminal 50. It is provided with a sub-joint part 58B that joins the surface S4 on one side in the direction T and the part 50C adjacent to the locking recess 50B. In this way, by configuring the soldering part 58 to have the sub-joining part 58B in addition to the main joining part 58A, it is possible to suppress the occurrence of defects such as peeling of the soldering part 58.

Furthermore, in the vehicle electroacoustic transducer 10 of the present embodiment, the bent portion 54 of the wiring member 48 is inclined toward the front side, and as the sub-joint portion 58B of the soldered portion 58 moves toward the front side, It is shaped like a widening fan. With this configuration, the volume of the sub-joint portion 58B can be secured. Thereby, a conductive path between the wiring member 48 and the second terminal 50 can be ensured.

Further, in the electroacoustic transducer 10 for a vehicle according to the present embodiment, the sub-joining portion 58B of the soldering portion 58 is attached to a portion 54B of the bent portion 54 of the wiring member 48 on the opposite side to the locked portion 52. It is separated from the locking piece part 50A of the second terminal 50 in the state where it is not closed. With this configuration, it is possible to prevent the sub-joint portion 58B of the soldering portion 58 from having a shape different from the fan shape.

In the present embodiment described above, the portion 54B of the bent portion 54 of the wiring member 48 on the opposite side to the locked portion 52 is attached to the portion 54B of the bent portion 54 of the wiring member 48 without the sub-joining portion 58B of the soldering portion 58 attached thereto. Although an example has been described in which the locking piece 50A of the second terminal 50 is separated from the locking piece 50A, the present invention is not limited thereto. For example, the entire bent portion 54 of the wiring member 48 may be connected to the locking piece portion 50A of the second terminal 50 via the sub-joint portion 58B of the soldering portion 58.

Further, in the present embodiment described above, an example has been described in which the bending direction of the bending portion 54 is bent in the opposite direction to the opening direction of the locking recess 50B, but the present invention is not limited to this. The bent portion 54 may be bent in other directions.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and can be implemented with various modifications other than the above without departing from the spirit thereof. Of course.

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

Claims (4)

A diaphragm that generates sound by vibrating,
A coil body that includes a bobbin to which the diaphragm is fixed, and a coil formed along the bobbin, and vibrates the diaphragm when the coil is energized;
a terminal that forms part of a current path between the coil body and has a locking recess that is open on one side;
A locked part that forms another part of the current path between the coil body and is locked in the locking recess, and a bent part that is bent with respect to the locked part. A wiring member having;
a soldering part having a main joint part that joins the locked part and the inner circumferential surface of the locking recess, and a sub-joint part that joins at least a part of the bent part and the terminal;
An electro-acoustic transducer for vehicles installed outside the vehicle cabin. The electroacoustic transducer for a vehicle according to claim 1, wherein the sub-joint portion is formed in a shape that widens toward the tip of the wiring member. The electroacoustic transducer for a vehicle according to claim 1 or 2, wherein the bent portion is bent toward a side opposite to a direction in which the locking recess is opened. Applied to the method for manufacturing an electroacoustic transducer for a vehicle according to any one of claims 1 to 3,
a wiring member locking step of locking the locked portion in the locking recess;
a wiring member bending step of forming the bent portion by bending a part of the wiring member using the locking recess as a fulcrum;
a soldering step of forming the main joint part and the sub-joint part by depositing molten solder in and around the locking recess in the terminal;
A method of manufacturing an electroacoustic transducer for a vehicle having the following.