JP7709937B2 - Electroacoustic transducer for vehicle and method for manufacturing the same - Google Patents

Description

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

The following Patent Document 1 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 electricity is applied to the coil, the vibrating body vibrates.

JP 2021-29003 A

However, vibrations caused by the vehicle traveling are input to a vehicle electro-acoustic transducer mounted on a vehicle, such as the audio device described in Patent Document 1. This vibration is also input to the soldered joints that electrically join the components that make up the vehicle electro-acoustic transducer. Therefore, from the viewpoint of ensuring the electrical reliability of the vehicle electro-acoustic transducer, it is important to suppress the occurrence of defects such as peeling of the soldered joints. Furthermore, vehicle electro-acoustic transducers installed outside the vehicle cabin are required to have higher durability than devices installed inside the vehicle cabin, and therefore it is necessary to further suppress the occurrence of defects such as peeling of the soldered joints.

In consideration of the above, the present invention aims to provide a vehicle electroacoustic transducer and a method for manufacturing a vehicle electroacoustic transducer that can suppress the occurrence of defects such as peeling of soldered joints.

The electroacoustic transducer for vehicles of the first aspect has a diaphragm that generates sound by vibrating, a bobbin to which the diaphragm is fixed, and a coil formed along the bobbin, and is provided outside the vehicle cabin. The transducer is provided with a coil body that vibrates the diaphragm when current is passed through the coil, a terminal that forms part of the current path between the coil body and the terminal and has a locking recess with one side open, a wiring member that forms the other part of the current path between the coil body and the wiring member and has an engaged part that is engaged in the locking recess and a bent part that is bent around the engaged part, and a soldering part that has a main joint that joins the engaged part to the inner circumferential surface of the locking recess and a secondary joint that joins at least a part of the bent part to the terminal.

According to the first aspect of the vehicle electroacoustic transducer, electricity is passed through the coil via the terminal and wiring member, which are the wiring path. This causes the diaphragm to vibrate and generate sound. Here, the soldered portion that connects the terminal and the wiring member has a main joint that joins the locked portion of the wiring member to the inner circumferential surface of the locking recess of the terminal. In addition, the soldered portion has a secondary joint that joins at least a portion of the bent portion of the wiring member to the terminal. In this way, by configuring the soldered portion to have a secondary joint in addition to the main joint, it is possible to suppress the occurrence of defects such as peeling of the soldered portion.

The second aspect of the vehicle electroacoustic transducer is the first aspect of the vehicle electroacoustic transducer, in which the secondary joint is formed in a shape that widens as it approaches the tip of the wiring member.

According to the second aspect of the vehicle electroacoustic transducer, the secondary joint of the soldering portion is formed in a shape that widens as it approaches the tip of the wiring member. By configuring it in this way, it is possible to ensure the volume of the secondary joint.

The third aspect of the vehicle electroacoustic transducer is the second aspect of the vehicle electroacoustic transducer, in which the bent portion is bent in the direction opposite to the opening direction of the locking recess. This allows the bent portion to be joined to the part of the terminal opposite to the opening direction of the locking recess via the secondary joint.

The manufacturing method of the electroacoustic transducer for vehicles of the fourth aspect is applied to the manufacturing method of the electroacoustic transducer for vehicles of any one of the first to third aspects, and includes a wiring member locking process for locking the locked portion in the locking recess, a wiring member bending process for forming the bent portion by bending a part of the wiring member using the locking recess as a fulcrum, and a soldering process for forming the main joint and the secondary joint by applying molten solder to the inside and the periphery of the locking recess in the terminal.

According to the fourth aspect of the manufacturing method for a vehicle electroacoustic transducer, by going through the above-mentioned wiring member locking process, wiring member bending process, and soldering process, it is possible to form a soldered portion having a secondary joint in addition to a primary joint. This makes it possible to suppress the occurrence of defects such as peeling of the soldered portion.

The vehicle electroacoustic transducer of the present invention has the excellent effect of suppressing the occurrence of defects such as peeling of soldered parts.

1 is an exploded perspective view showing a vehicle electroacoustic transducer according to an embodiment of the present invention; 2 is a perspective view showing the inside of a vehicle electro-acoustic transducer in a state in which the rear cover side is cut along a direction perpendicular to the front-rear direction. FIG. 4 is an enlarged perspective view showing the vicinity of a locking piece portion of the second terminal. FIG. 4 is a diagram showing a cross section of the wiring member taken along line 4-4 in FIG. 3 and a locking piece portion of the second terminal, etc. FIG. 11A and 11B are diagrams showing a wiring member, a locking piece of a second terminal, and the like. 11A to 11C are diagrams illustrating a wiring member bending process.

A vehicle electroacoustic transducer 10 according to an embodiment of the present invention will be described with reference to Figures 1 to 6. The vehicle electroacoustic transducer 10 of this embodiment is mounted in a power unit compartment outside the vehicle cabin, and an example will be described in which the vehicle electroacoustic transducer 10 is used as an acoustic vehicle alerting system (AVAS) that generates sound during low-speed driving to alert pedestrians of an approaching vehicle. The front and rear sides of the vehicle electroacoustic transducer 10 are indicated by arrows FR and RR, respectively. In the following description, when the front and rear directions are simply indicated, they will refer to the front and rear directions of the vehicle electroacoustic transducer 10 unless otherwise specified. The front and rear directions of the vehicle electroacoustic transducer 10 are the same as the front and rear directions of the vehicle when the vehicle electroacoustic transducer 10 is mounted on the vehicle.

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 attached to the front and rear of the main baffle 12, respectively. The vehicle electroacoustic transducer 10 also includes a sound generator main body 18 that is disposed within the main baffle 12 and supported by the main baffle 12.

The main baffle 12 includes a base tube 12A formed in a substantially rectangular tube shape and a partition wall 12B that divides the space inside the base tube 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 adapted to be blocked by a vibration plate 32 described later. In addition, a second through hole 12D is formed in the partition wall 12B, with an inner diameter set smaller than that of the first through hole 12C. This second through hole 12D is adapted to be blocked by a plug 20. In addition, the main baffle 12 includes a connector connection portion 12E that protrudes from the outer periphery of the base tube 12A toward the outside of the base tube 12A. This connector connection portion 12E is adapted to be connected to an external connector (not shown).

The front cover 14 comprises a front cover body 14A formed in a rectangular shape when viewed from the front-rear direction, and a plurality of locking claws 14B protruding from the front cover body 14A toward the main baffle 12. The front cover body 14A has a plurality of slits 14C formed therein for transmitting sound generated by a diaphragm 32 (described below) to the front side of the front cover body 14A. The plurality of locking claws 14B are adapted to be locked to the main baffle 12. The front cover 14 is attached to the main baffle 12 by locking the plurality of locking claws 14B 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. A T-nut 22 is fixed to the rear cover main body 16A. A bolt (not shown) is screwed into the T-nut 22 to fix the vehicle electroacoustic transducer 10 to the vehicle. The plurality of locking claws 16B are locked to the main baffle 12. The rear cover 16 is attached to the main baffle 12 by locking the plurality of locking claws 16B 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, 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 in a roughly stepped cylindrical shape with a larger opening at the front than at the rear. The opening at the front of the frame 24 is closed by the diaphragm 32, which will be described later.

The magnetic circuit section 26 applies a magnetic field to the coil body 28, which will be described later. The magnetic circuit section 26 includes a yoke 34 formed in a bottomed cylindrical shape, a disk-shaped magnet 36 fixed to the bottom surface of the yoke 34, and a disk-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 and is provided so as to cover the 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 the coil body 28, which will be described later, is arranged in this gap.

The coil body 28 is configured to include a cylindrically formed 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 linear conductor 44 made of a conductive material along the bobbin 40. A pair of terminal portions 44A of the conductor 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 a disk shape with an opening in the radial center and in a wave shape that repeatedly curves back and forth along the radial direction. The coil body 28 is inserted into the opening formed in the center of the damper 30. The inner circumference of the damper 30 is engaged with the bobbin 40 of the coil body 28, and the outer circumference of the damper 30 is engaged with the frame 24.

The diaphragm 32 is formed in a circular shape when viewed from the front-to-rear direction, with the front side curved in a concave shape. An edge portion 32A made of an elastic material such as rubber is provided around the entire periphery of the diaphragm 32. The outer periphery of the edge portion 32A is joined to the frame 24 around its entire periphery.

Next, we will explain the configuration of the wiring path between the coil 42, which is a key part of this embodiment, and an external connector (not shown).

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 protruding from the frame 24 toward the rear side. The first locking piece 46A is formed with a locking recess 46B with an open rear side. The pair of terminals 44A of the conductor 44 forming the coil 42 are locked in the locking recesses 46B of the pair of first terminals 46 while being disposed in the respective locking recesses 46B. Furthermore, the pair of terminals 44A of the conductor 44 forming the coil 42 and the first locking pieces 46A of the pair of first terminals 46 are joined via soldered parts (not shown). 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 hard copper wire, which is harder than the conductor 44 forming the coil 42. Here, the wiring member 48 may be any wire that can maintain the folded shape when folded, and may be, for example, hard copper wire, phosphor bronze wire, soft copper wire, etc. One end 48A of the pair of wiring members 48 is inserted into a locking hole 46D formed in the second locking piece portion 46C of the pair of first terminals 46. The one end 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 soldered portion (not shown). The other end 48B of the pair of wiring members 48 is connected to a pair of second terminals 50, which will be described later.

The second terminal 50 as a terminal is formed by pressing a conductive metal plate, similar to the first terminal 46. The second terminal 50 is supported by the main baffle 12 by being partially embedded in the main baffle 12. As shown in FIG. 3, one end of the second terminal 50 is a locking piece 50A that protrudes rearward from the main baffle 12. Here, one thickness direction side and one width direction side of the locking piece 50A are indicated by arrows T and W. The thickness direction T and width direction W of the locking piece 50A are perpendicular to each other, and the thickness direction T and width direction W of the locking piece 50A are perpendicular to the front-rear direction. A locking recess 50B with an open rear side is formed in the center of the width direction W of the locking piece 50A. The rear end side of the inner peripheral surface of this locking recess 50B is a widening surface S1 that is set so that the dimension in the width direction W gradually increases as it approaches the rear side. In addition, the portion of the inner peripheral surface of the locking recess 50B that is forward of the widening surface S1 and has a constant dimension in the width direction W at each position in the vertical direction is the stationary surface S2. The dimension in the width direction W between the stationary surfaces S2 is set to a dimension equal to 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 the locking surface S3. The locking surface S3 is curved in a U-shape with the rear side open when viewed from the thickness direction T of the locking piece portion 50A. In other words, the widening surface S1, the stationary 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.

Although not shown in the figure, the other end of the second terminal 50 is a connection piece portion that is placed in the connector connection portion 12E (see FIG. 1) of the main baffle 12. When an external connector (not shown) is connected to the connector connection portion 12E, an external connector terminal in the external connector (not shown) is connected to the connection piece portions of the pair of second terminals 50.

As shown in FIG. 3, the portion of the other end 48B of the wiring member 48 that is engaged with the engaging recess 50B is referred to as the engaged portion 52. Also, the portion of the other end 48B of the wiring member 48 that extends from the engaged portion 52 to one side in the thickness direction T of the engaging piece portion 50A of the second terminal 50 is referred to as the bent portion 54. The boundary between the engaged portion 52 and the bent portion 54 at the other end 48B of the wiring member 48 is a bent portion 56 that is bent forward. By having this bent portion 56, the bent portion 54 is inclined forward relative to the engaged portion 52.

As shown in Figures 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 Figure 4, the locked portion 52 of the wiring member 48 is disposed along the locking surface S3 of the locking recess 50B. The locked portion 52 and the locking surface S3 and stationary surface S2 of the locking recess 50B are joined by a soldered portion 58. Here, the portion of the soldered portion 58 that joins the locked portion 52 and the locking surface S3 and stationary surface S2 of the locking recess 50B is referred to as the main joint portion 58A.

5, the portion 54A of the bent portion 54 of the wiring member 48 on the side of the engaged portion 52 and the portion 50C on the surface S4 on one side in the thickness direction T of the engaging piece portion 50A of the second terminal 50, adjacent to the engaging recess 50B, are joined by the soldered portion 58. Here, the portion of the soldered portion 58 that joins the portion 54A of the bent portion 54 on the side of the engaged portion 52 and the portion 50C on the surface S4 on one side in the thickness direction T of the engaging piece portion 50A of the second terminal 50, adjacent to the engaging recess 50B, is called the secondary joint 58B. The shape of the secondary joint 58B when viewed from the width direction W of the engaging piece portion 50A is a fan shape that gradually widens toward the front side. The shape of the secondary joint 58B is not limited to a fan shape. The shape of the secondary joint 58B may be set appropriately taking into account the shape and posture of the bent portion 54 of the wiring member 48.

In addition, the portion 54B of the bent portion 54 of the wiring member 48 opposite the engaged portion 52 is separated from the engaging piece portion 50A of the second terminal 50 without the secondary joint portion 58B of the soldering portion 58 being attached.

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

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 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, a part of the wiring member 48 is bent 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 to form a bent portion 54 (wiring member bending process). Next, as shown in FIG. 4 and FIG. 5, the molten solder is applied to the inside and the periphery of the locking recess 50B of the second terminal 50 to form the main joint 58A and the secondary joint 58B of the soldering portion 58 (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 soldered portion 58.

(Actions and Effects of the Present Embodiment)
Next, the operation and effects of this embodiment will be described.

As shown in Figures 1 and 2, in the vehicle electroacoustic transducer 10 of this embodiment, electricity is passed through the coil 42 of the coil body 28 via a pair of first terminals 46, a pair of wiring members 48, and a pair of second terminals 50, which are wiring paths. As a result, as the coil body 28 moves in the fore-and-aft direction, the diaphragm 32 vibrates to generate sound.

Here, as shown in FIG. 4, in the vehicle electroacoustic transducer 10 of this embodiment, the soldering portion 58 that joins the other end 48B of the wiring member 48 and the locking piece portion 50A of the second terminal 50 has a main joint portion 58A that joins the locked portion 52 of the wiring member 48 and the locking surface S3 and the stationary 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 sub-joint portion 58B that joins the part 54A on the locked portion 52 side of the bent portion 54 of the wiring member 48 and the surface S4 on one side of the thickness direction T of the locking piece portion 50A of the second terminal 50 and the part 50C adjacent to the locking recess 50B. In this way, by configuring the soldering portion 58 to have the sub-joint portion 58B in addition to the main joint portion 58A, the occurrence of defects such as peeling of the soldering portion 58 can be suppressed.

In addition, in the vehicle electroacoustic transducer 10 of this embodiment, the bent portion 54 of the wiring member 48 is inclined forward, and the secondary joint 58B of the soldering portion 58 is formed in a fan shape that widens as it moves forward. This configuration ensures the volume of the secondary joint 58B. This ensures a conductive path between the wiring member 48 and the second terminal 50.

In addition, in the vehicle electroacoustic transducer 10 of this embodiment, the portion 54B of the bent portion 54 of the wiring member 48 opposite the locked portion 52 is separated from the locking piece portion 50A of the second terminal 50 in a state where the secondary joint portion 58B of the soldered portion 58 is not attached. By configuring it in this way, it is possible to prevent the secondary joint portion 58B of the soldered portion 58 from becoming a shape other than a fan shape.

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

In the above embodiment, the bending direction of the bent portion 54 is opposite to the opening direction of the locking recess 50B, but the present invention is not limited to this, and the bent portion 54 may be bent in another direction.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it is of course possible to implement the invention in various other modified forms without departing from the spirit of the invention.

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 portion 54; bent portion 58; soldered portion 58A; main joint portion 58B; secondary joint portion

Claims (5)

A diaphragm that generates sound by vibrating;
A coil body including a bobbin to which the diaphragm is fixed and a coil formed along the bobbin, the coil vibrating the diaphragm when current is applied to the coil;
a terminal that forms a part of a current path between the coil body and the terminal and has a locking recess that is open on one side;
a wiring member that forms another part of a current path between the coil body and the wiring member, the wiring member having a locked portion that is locked in the locking recess and a bent portion that is bent with respect to the locked portion;
a soldering portion having a main joint portion that joins the locked portion and an inner circumferential 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 a vehicle compartment ,
The bent portion is formed by having a bent portion in the wiring member,
the at least one part of the bent portion and the part of the locking piece portion on one side in the thickness direction where the locking recess is formed and adjacent to the locking recess are joined by the secondary joint portion;
Electro-acoustic transducer for vehicles . The vehicle electroacoustic transducer according to claim 1, wherein the secondary joint 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 in a direction opposite to the opening direction of the locking recess. The inner circumferential surface of the locking recess is
A stationary surface;
A locking surface which is a bottom surface of the locking recess;
Including,
The locking surface is curved in a U-shape when viewed in a thickness direction of the locking piece portion,
the engaged portion of the wiring member is disposed close to the engaging surface such that an outer circumferential surface of the engaged portion is aligned along a U-shaped curved surface of the engaging surface,
The main joint portion joins the engaged portion to the engaging surface and the stationary surface of the engaging recess.
4. The electroacoustic transducer for a vehicle according to claim 3. The method for manufacturing a vehicle electro-acoustic transducer according to any one of claims 1 to 4 ,
a wiring member locking step of locking the locked portion into the locking recess;
a wiring member bending step of bending a part of the wiring member using the locking recess as a fulcrum to form the bent portion;
a soldering process for forming the main joint and the sub-joint by applying molten solder to the inside and the periphery of the locking recess of the terminal;
A method for manufacturing an electro-acoustic transducer for a vehicle having the above structure.