JP2023146289A - Vehicle electroacoustic transducer - Google Patents

Abstract

To inhibit entry of water.SOLUTION: A vehicle electroacoustic transducer 10 includes a main baffle 12 which is formed in a box shape and formed with a first through hole 12C. Further, the vehicle electroacoustic transducer 10 includes a vibration part 32 which is disposed within the main baffle 12 and provided so as to close the first through hole 12C and vibrates to generate sound. The vibration part 32 includes: an outer periphery part 60 forming an outer periphery portion thereof and formed in an annular shape; and an inner periphery part 62 which closes a center portion of the outer periphery part 60 and is integrally formed with the outer periphery part 60.SELECTED DRAWING: Figure 2

Description

The present invention relates to an 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

By the way, water may adhere to a vehicle electroacoustic transducer mounted on a vehicle, such as the acoustic device described in Patent Document 1, due to the environment around the vehicle. Therefore, it is desirable to be able to suppress the infiltration of this water into the interior of the vehicle electroacoustic transducer.

The present invention has been made in consideration of the above-mentioned facts, and an object of the present invention is to obtain an electroacoustic transducer for a vehicle that can suppress water intrusion.

A first aspect of the electroacoustic transducer for a vehicle includes a baffle formed in a box shape and having an opening formed therein; and an outer circumferential portion of the baffle, which is disposed within the baffle and is provided so as to close the opening. an annular outer circumferential portion forming a concave outer side of the baffle; and an inner circumferential portion closing a central portion of the outer circumferential portion, integrally formed with the outer circumferential portion, and having a concave outer side of the baffle. and a vibrating part that generates sound by vibrating, and is provided outside the vehicle interior.

According to the first aspect of the electroacoustic transducer for a vehicle, the vibrating section vibrates to generate sound. Here, the vibrating section is disposed within the baffle and is provided so as to close the opening. This configuration suppresses water from entering the baffle through the openings formed in the baffle. Further, the vibrating portion has an annular and concave outer circumferential portion and a concave inner circumferential portion that closes the center portion of the outer circumferential portion. Here, the outer peripheral part and the inner peripheral part that constitute the vibrating part are integrally formed. This configuration suppresses water from entering the baffle from the boundary between the outer circumference and the inner circumference.

The electroacoustic transducer for a vehicle according to a second aspect is the electroacoustic transducer for a vehicle according to the first aspect, including a bobbin formed in a cylindrical shape and a coil formed along the bobbin, The coil body includes a coil body that vibrates the vibrating portion when the coil is energized, a bent portion is formed at a boundary between the outer peripheral portion and the inner peripheral portion, and an end of the bobbin is arranged in the bent portion. The vibrating section is fixed to the bobbin in a state where the vibrating section is locked to the bobbin.

According to the electroacoustic transducer for a vehicle according to the second aspect, when the coil of the coil body is energized, the vibrating section vibrates to generate sound. Here, a bent part is formed at the boundary between the outer circumferential part and the inner circumferential part of the vibrating part, and the vibrating part is fixed to the bobbin with the end of the bobbin locked in the bent part. There is. With this configuration, the bobbin and the vibrating section can be easily positioned.

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 inner circumferential portion is disposed inside the bobbin in the radial direction, so that the bobbin of the vibrating portion The bobbin is positioned in the radial direction relative to the bobbin.

According to the electroacoustic transducer for a vehicle according to the third aspect, the inner peripheral part of the vibrating part is arranged radially inside the bobbin, so that the bobbin is positioned in the radial direction of the vibrating part with respect to the bobbin. . With this configuration, it is possible to further facilitate positioning of the bobbin and the vibrating section.

The electroacoustic transducer for a vehicle according to a fourth aspect is the electroacoustic transducer for a vehicle according to the third aspect, in which a surface facing the inner circumferential surface of the bobbin in the radial direction in the inner circumferential portion is It is an inclined surface that is inclined with respect to the vibration direction of the vibrating part.

According to the electroacoustic transducer for a vehicle according to the fourth aspect, in the inner circumferential portion of the vibrating portion, the inner circumferential surface of the bobbin and the surface facing the bobbin in the radial direction are inclined with respect to the vibration direction of the vibrating portion. It is a face. With this configuration, the center of the vibrating portion and the center of the bobbin can be brought closer to each other when inserting the inner circumferential portion of the vibrating portion inside the bobbin in the radial direction. Thereby, it is possible to suppress a decrease in concentricity between the vibrating part and the bobbin.

The electroacoustic transducer for a vehicle according to the present invention has an excellent effect of suppressing water intrusion.

FIG. 1 is an exploded perspective view showing the electroacoustic transducer for a vehicle according to the present embodiment. FIG. 1 is a cross-sectional view showing a cross section of the vehicle electroacoustic transducer of the present embodiment taken along the front-rear direction. FIG. 3 is an enlarged cross-sectional view showing an enlarged portion surrounded by a dashed line in FIG. 2. FIG.

An electroacoustic transducer 10 for a vehicle according to an embodiment of the present invention will be described using FIGS. 1 to 3. 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 as a box-shaped baffle, and a front cover 14 and a rear cover 16 attached to the front and rear parts of the main baffle 12, respectively. , is equipped with. 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 serving as an opening is formed in the center of the partition wall 12B. This first through hole 12C is closed by a vibrating section 32, which will be described later. Here, the vibrating section 32 can be formed using a material called PEI (polyetherimide), PI (polyimide), PET (polyethylene terephthalate), or PEN (polyethylene naphthalate), for example. 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 vibrating section 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 joint between the rear cover 16 and the main baffle 12 is sealed with a sealant (eg, adhesive) to ensure watertightness.

As shown in FIGS. 1 and 2, the sound generator main 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 coil body 28 and a frame 24. 24, and a vibrating section 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 vibrating section 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 vibrating section 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 terminals (not shown).

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.

Next, the configuration of the vibrating section 32, which is the main part of this embodiment, will be explained.

As shown in FIG. 2, the vibrating section 32 is formed in a circular shape when viewed from the front and back direction, and is also formed in a shape with a concave opening at the front side. This vibrating section 32 includes an annularly formed outer circumferential section 60 that constitutes a radially outer portion of the vibrating section 32, and an annularly formed outer circumferential section 60 that constitutes a radially central section of the vibrating section 32 and is integrally formed with the outer circumferential section 60. An inner circumferential portion 62 is provided. In the vibrating section 32 of this embodiment, both the outer peripheral part 60 and the inner peripheral part 62 are formed in a shape in which the front side, which is the outside of the main baffle 12, is open in a concave shape. Note that the arrow R in FIG. 2 indicates the radially outer side of the vibrating section 32. Further, the radial direction (the direction of arrow R and the direction opposite to arrow R) of the vibrating portion 32 is a direction perpendicular to the front-rear direction. Hereinafter, when simply indicating the radially outer and inner directions, unless otherwise specified, the radially outer and inner directions of the vibrating section 32 are indicated.

The outer peripheral portion 60 is formed in a funnel shape that narrows from the front side toward the rear side. The outer circumferential portion 60 includes an inclined wall portion 60A that is inclined rearward as it goes radially inward, and an inner side that is bent radially inward from the radially inner end of the inclined wall portion 60A and extends in the radial direction. An end portion 60B.

As shown in FIGS. 2 and 3, the inner peripheral portion 62 is formed to have a convex shape toward the rear side and a concave shape at the front side. The inner peripheral portion 62 includes a curved wall portion 62A having a concavely curved front surface and a convexly curved rear surface. Moreover, the inner circumferential portion 62 includes an annular annular wall portion 62B that is bent and extends from the radially outer end of the curved wall portion 62A toward the front side. The front end of this annular wall portion 62B is connected to the radially inner end of the inner end portion 60B of the outer peripheral portion 60. Here, the portion formed by the annular wall portion 62B and the inner end portion 60B will be referred to as a bent portion 64. A cross section of this bent portion 64 taken along the front-rear direction has an L-shaped bent shape. Note that the bent portion 64 is not limited to the L-shaped bent shape, but may be bent in other shapes. Further, the radially outer surface of the annular wall portion 62B is an inclined surface 62C that gently slopes radially inward toward the rear side. That is, the radially outer surface of the annular wall portion 62B is an inclined surface 62C that is gently inclined with respect to the front-rear direction, which is the vibration direction of the vibrating portion 32.

The inner peripheral part 62 of the vibrating part 32 described above is inserted into the bobbin 40 of the coil body 28 from the front side. When the inner peripheral part 62 of the vibrating part 32 is inserted into the bobbin 40 of the coil body 28, the front end part 40A of the bobbin 40 is formed at the boundary between the outer peripheral part 60 and the inner peripheral part 62 of the vibrating part 32. It is locked to the bent portion 64. The front end portion 40A of the bobbin 40 and the bent portion 64 of the vibrating portion 32 are joined via an adhesive or the like.

As shown in FIGS. 1 and 2, an edge portion 32A made of an elastic material such as rubber is provided on the radially outer edge of the outer peripheral portion 60 of the vibrating portion 32 over the entire circumference. . The radially outer end of the edge portion 32A is joined to the frame 24 over its entire circumference. This ensures watertightness between the edge portion 32A and the frame 24.

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

As shown in FIGS. 1 to 3, in the vehicle electroacoustic transducer 10 of this embodiment, the coil 42 of the coil body 28 is energized via each wiring route (not shown), an external connector (not shown), etc. Ru. As a result, as the coil body 28 moves in the front-back direction, the vibrating section 32 vibrates and generates sound.

Here, in the electroacoustic transducer 10 for a vehicle according to the present embodiment, the vibrating section 32 is disposed within the main baffle 12 and is provided so as to close the first through hole 12C formed in the main baffle 12. . This configuration prevents water from entering the main baffle 12 through the first through hole 12C formed in the main baffle 12.

Further, the vibrating section 32 has an annular outer circumferential portion 60 and an inner circumferential portion 62 that closes the center portion of the outer circumferential portion 60 . Here, the outer peripheral part 60 and the inner peripheral part 62 that constitute the vibrating part 32 are integrally formed. With this configuration, water attached to the vibrating portion 32 is suppressed from entering the main baffle 12 from the boundary between the outer circumferential portion 60 and the inner circumferential portion 62. In this way, in this embodiment, water intrusion can be suppressed compared to a configuration in which the outer peripheral part 60 and the inner peripheral part 62 of the vibrating part 32 are formed separately. Further, in the vibrating section 32 of this embodiment, both the outer peripheral part 60 and the inner peripheral part 62 are formed in a shape in which the front side, which is the outside of the main baffle 12, is open in a concave shape. As a result, compared to a configuration in which both the outer circumferential part 60 and the inner circumferential part 62 are formed in a convex shape to the outside of the main baffle 12, the outer circumferential part 60 and the inner circumferential part 62 are crushed by pressure when washing the car or submerging in water. This can be suppressed.

Further, in the electroacoustic transducer 10 for a vehicle according to the present embodiment, a bent portion 64 is formed at the boundary between the outer peripheral portion 60 and the inner peripheral portion 62 of the vibrating portion 32, and the front end portion 40A of the bobbin 40 is The vibrating section 32 is fixed to the bobbin 40 while being engaged with the bending section 64 . With this configuration, the bobbin 40 and the vibrating section 32 can be easily positioned. As a result, vibrations from the bobbin 40 can be appropriately transmitted to the vibrating section 32.

Further, in the electroacoustic transducer 10 for a vehicle according to the present embodiment, the inner peripheral part 62 of the vibrating part 32 is formed in a convex shape toward the rear side, which is the bobbin 40 side, with respect to the outer peripheral part 60. By inserting the inner peripheral portion 62 of 32 into the radially inner side of the bobbin 40, the vibrating portion 32 is positioned with respect to the bobbin 40 in the radial direction. With this configuration, positioning of the bobbin 40 and the vibrating section 32 can be made even easier.

Further, in the electroacoustic transducer 10 for a vehicle according to the present embodiment, the radially outer surface of the annular wall portion 62B that constitutes a part of the inner peripheral portion 62 of the vibrating portion 32 moves radially inwardly toward the rear side. The slope surface 62C is gently sloped. As a result, when inserting the inner circumferential portion 62 of the vibrating portion 32 inside the bobbin 40 in the radial direction and aligning the inclined surface 62C of the annular wall portion 62B with the inner circumferential surface of the bobbin 40, the center of the vibrating portion 32 and The center of the bobbin 40 can be brought closer to the center. Thereby, it is possible to suppress the concentricity between the vibrating part 32 and the bobbin 40 from decreasing. Moreover, by having the above-mentioned inclined surface 62C, ease of assembly when assembling the inner peripheral part 62 of the vibrating part 32 to the bobbin 40 can be improved. Furthermore, by having the above-described inclined surface 62C, the vibrating portion 32 and the bobbin 40 can be firmly adhesively fixed by interposing the adhesive G between the inclined surface 62 and the inner peripheral surface of the bobbin 40.

In addition, in the present embodiment described above, an example was described in which the radially outer surface of the annular wall portion 62B is an inclined surface 62C, but the present invention is not limited to this. Whether or not the radially outer surface of the annular wall portion 62B should be the inclined surface 62C may be determined as appropriate, taking into consideration the required concentricity between the vibrating portion 32 and the bobbin 40, and the like.

Further, in the present embodiment described above, an example has been described in which the inner peripheral part 62 of the vibrating part 32 is formed in a convex shape toward the rear side, which is the bobbin 40 side, with respect to the outer peripheral part 60. is not limited to this. For example, the inner peripheral part 62 of the vibrating part 32 may be formed in a convex shape with respect to the outer peripheral part 60 toward the front side, which is the side opposite to the bobbin 40.

Further, in the present embodiment described above, a bent portion 64 is formed at the boundary between the outer peripheral portion 60 and the inner peripheral portion 62 of the vibrating portion 32, and the front end portion 40A of the bobbin 40 is engaged with the bent portion 64. Although an example has been described in which the vibrating section 32 is fixed to the bobbin 40 in a stopped state, the present invention is not limited to this. For example, in a case where another configuration for positioning the vibrating part 32 and the bobbin 40 is applied, a configuration in which the bending part 64 is not formed may be used.

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 12 Main baffle (baffle)
12C First through hole (opening)
32 Vibrating part 40 Bobbin 42 Coil 60 Outer peripheral part 62 Inner peripheral part 62C Inclined surface 64 Bent part

Claims (4)

a baffle formed in a box shape and having an opening formed therein;
an annular outer circumferential portion that is disposed within the baffle and is provided so as to close the opening; an annular outer circumferential portion forming the outer circumferential portion thereof and a concave outer side of the baffle; a vibrating part that generates sound by vibrating; an inner peripheral part that is integrally formed with the outer peripheral part and in which the outside of the baffle is formed in a concave shape;
An electro-acoustic transducer for vehicles installed outside the vehicle cabin. A coil body comprising a cylindrical bobbin and a coil formed along the bobbin, and vibrates the vibrating part when the coil is energized,
A bent part is formed at the boundary between the outer peripheral part and the inner peripheral part,
The electroacoustic transducer for a vehicle according to claim 1, wherein the vibrating section is fixed to the bobbin with an end of the bobbin being locked to the bending section. The electroacoustic transducer for a vehicle according to claim 2, wherein the inner circumferential portion is arranged radially inside the bobbin, thereby positioning the vibrating portion with respect to the bobbin in the radial direction of the bobbin. 4. The electroacoustic device for a vehicle according to claim 3, wherein in the inner circumferential portion, an inner circumferential surface of the bobbin and a surface facing the bobbin in the radial direction are inclined surfaces inclined with respect to the vibration direction of the vibrating section. converter.