JP7126762B2 - Vibrating device for sound and sound generator using said vibrating device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound generator having an acoustic vibrating device that vibrates a mass section having a magnet, and a main vibrating body that is vibrated by the vibration reaction force of the mass section.

Patent Literature 1 describes an invention relating to an acoustic vibrator that vibrates an automobile interior material or the like to function as a speaker.

This acoustic vibrator is provided with a magnetic circuit (1) in which a magnet (3) and a plate (4) are adhered to a yoke (2), and a frame (9) having openings at both ends. One end of (9) and the magnetic circuit (1) are connected by a suspension (5) of elastic sheet metal. The vibrating section (6) is provided with a vibrator (7) supported by a frame (9) via an elastic body (10), and a coil section (8a) supported by the vibrator (7). , is arranged in the gap formed between the yoke (2) and the plate (4) of the magnetic circuit (1).

When the acoustic vibrator is mounted on a vehicle, the vibrator (7) is fixed to a vibrating member (12) such as an interior material by means of adhesion or the like. When a current is applied to the coil part (8a) of the acoustic vibrator, the vibrating part (6) vibrates, the vibration is transmitted from the vibrator (7) to the vibrating member (12), and the vibrating member (12) It vibrates and produces sound pressure.

JP 2007-318623 A

The acoustic vibrator described in Patent Document 1 has a structure in which sound pressure is generated by vibration of a vibrating member (12) excited by a vibrator (7). Therefore, the sounding frequency band depends on the vibration characteristics of the vibrating member (12). When the vibrating member (12) is an automobile interior material or the like, the frequency band in which a predetermined sound volume can be obtained is narrowed, and the low and high frequency outputs tend to decrease.

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-described problems of the prior art, and is an acoustic vibrating device capable of widening the frequency band of sound generation even when an interior material or the like is used as a vibrating member, and a sound generating device using the vibrating device. is intended to provide

The present invention comprises a magnetic circuit section including a magnet, a mass section including the magnetic circuit section, a coil on which a magnetic field generated by the magnetic circuit section acts, a vibration transmission section supporting the coil, and the mass section. A damper provided between the vibration transmitting section and an acoustic vibrating device comprising:
A vibrating sheet is provided between the mass section and the vibration transmitting section, the vibrating sheet being located forward of the damper in the direction of sound generation.

In the acoustic vibrating device of the present invention, the vibration transmitting section is provided with a bobbin that supports the coil,

The vibrating seat may be configured as a ring-shaped one positioned around the bobbin.

In the acoustic vibrating device of the present invention, it is preferable that the vibration sheet is made of a material whose flexural rigidity is lower than that of the damper. Moreover, it is preferable that the vibration sheet is made of a material having a smaller mass per unit area than the damper.

Further, according to the present invention, there is provided a sound generator provided with the vibrating device for sound and a main vibrating body on which the vibrating device is installed,
The vibration transmitting portion is provided with a transmission support fixed to the main vibrating body,
A plurality of holes are formed in the main vibrating body so as to surround a fixed area to which the transmission support is fixed.

Further, according to the present invention, there is provided a sound generator provided with the vibrating device for sound and a main vibrating body on which the vibrating device is installed,
The vibration transmitting section is provided with a bobbin that supports the coil and a transmission support that fixes the bobbin to the main vibrator,
A hole facing the vibration sheet is formed in the main vibration body.

In the present invention, vibration generated between the mass portion and the vibration transmission portion is applied from the vibration transmission portion to the main vibrator. A vibration sheet is provided between the mass section and the vibration transmission section, or a vibration sheet facing the internal space of the bobbin of the vibration transmission section is provided. A relatively large sound pressure can be generated, and the output of pronunciation can be improved in a wide frequency band.

In addition, the vibration transmitting portion is provided with a transmission support for fixing the vibration transmission portion to the main vibrating body, and the main vibrating body is formed with a plurality of holes arranged so as to surround a fixing region to which the transmission support is fixed. With this structure, the vibration mode depends on the vibration characteristics of the main vibration body in a wide range, the vibration mode depends on the vibration characteristics of the area surrounded by the multiple holes of the main vibration body, and the vibration characteristics of the vibration sheet It is possible to realize sound generation with good sound quality in a wide frequency band.

1 is an exploded perspective view showing an acoustic vibrating device and a main vibrating body separated from each other in the sound generating device according to the first embodiment of the present invention; 1 is a cross-sectional view showing a state in which an acoustic vibrating device is installed on a main vibrating body in the sound generating device according to the first embodiment of the present invention; A plan view showing the main vibration body of the first embodiment of the present invention, FIG. 11 is an exploded perspective view showing a vibration excitation device for sound and a main vibrator separated from each other in a sound generating device according to a second embodiment of the present invention; A cross-sectional view showing a state in which an acoustic vibrating device is installed on a main vibrator in a sound generating device according to a second embodiment of the present invention;

A first embodiment of the invention is shown in FIGS. In the first embodiment, a sound generator (speaker) 1 is composed of a vibrating device 2 for sound and a main vibrator 3 to which the vibrating device 2 is attached.

As shown in the cross-sectional view of FIG. 2 , the vibrating device 2 has a mass section 10 having a magnetic circuit section 11 and a vibration transmitting section 20 supporting a coil 23 .

The mass portion 10 has a magnetic circuit portion 11 and a holding member 15 that holds the magnetic circuit portion 11 . The magnetic circuit unit 11 has a disc-shaped magnet 12, a first yoke 13 to which the upper surface of the magnet 12 is fixed in FIG. 2, and a second yoke 14 to which the lower surface of the magnet 12 is fixed. The first yoke 13 and the second yoke 14 are made of a ferrite-based or iron-based magnetic material. The first yoke 13 has a ring-shaped side wall portion 13a bent downward in FIG. 2, and a magnetic gap G is formed between the side surface of the disk-shaped second yoke 14 and the side wall portion 13a.

The holding member 15 has a first holding member 15a and a second holding member 15b. The first holding member 15a and the second holding member 15b are preferably made of a non-magnetic material such as a synthetic resin material or a non-magnetic alloy. The first yoke 13 of the magnetic circuit section 11 is held by a first holding member 15a. The second holding member 15b is fixed to the lower side of the first holding member 15a in the drawing, and the side wall portion 15c of the second holding member 15b has an opening width (inner diameter dimension) gradually increasing toward the main vibration body 3. It has a widening tapered shape.

The vibration transmitting portion 20 has a bobbin 21 and a transmission support 22 for fixing the bobbin 21 to the main vibrating body 3 . The transmission support 22 is preferably made of non-magnetic material. A coil 23 is wound around one end of the bobbin 21 , which is the upper end in the figure, and the transmission support 22 supports the other end of the bobbin 21 , the lower end in the figure. The coil 23 is inserted in the magnetic gap G of the magnetic circuit section 11 .

A damper (suspension) 31 is provided between the outer peripheral surface of the bobbin 21 forming the vibration transmitting portion 20 and the holding member 15 forming the mass portion 10 . The damper 31 is made of, for example, a composite of woven or non-woven fabric of chemical fibers and phenolic resin. The damper 31 has a ring shape as a whole, and has a corrugated shape in which a ring-shaped protrusion and a ring-shaped recess are repeated in the radial direction. The inner peripheral end 31a of the damper 31 is adhered and fixed to the outer peripheral surface of the bobbin 21, and the outer peripheral end 31b of the damper 31 is adhered and fixed to the lower surface of the first holding member 15a constituting the holding member 15. there is

The direction of sound generation of the sound generator 1 is the downward direction in FIG. The vibration sheet 32 has a ring shape as a whole, and the inner peripheral end 32a of the vibration sheet 32 is adhered and fixed to the outer peripheral surface of the bobbin 21, and the outer peripheral end 32b is attached to the inner surface of the second holding member 15b constituting the holding member 15. glued and fixed. The cross-sectional shape of the vibrating sheet 32 is curved forward (downward in the drawing) in the direction of sound generation.

The vibration sheet 32 is preferably made of a material having a lower degree of flexibility than the damper 31, that is, a material having a lower bending rigidity. Further, it is preferable that the vibration sheet 32 is made of a material whose mass per unit area in a flat state is smaller than the mass per unit area of the damper 31 in a flat state. The vibrating sheet 32 is made of, for example, a woven fabric or non-woven fabric made of silk or polyester fiber, or a polyethylene sheet.

The acoustic vibrating device 2 and the sound generating device 1 of the embodiment are for vehicle use, and the main vibrator 3 on which the vibrating device 2 is installed is an interior material of an automobile, for example, a roof interior material. A sound generating device 1 composed of a vibrating device 2 and a main vibrator 3 is a vehicle-mounted speaker. However, the main vibrator 3 may be an interior material other than the roof interior material, such as the interior material of the door of an automobile, or may be an interior material constituting an acoustic chamber other than the automobile. The bending rigidity of the vibrating sheet 32 provided in the vibrating device 2 is sufficiently lower than that of the main vibrating body 3, and the mass per unit area of the vibrating sheet 32 in a flat state is equal to that of the main vibrating body 3. is much smaller than the mass per unit area in the flat state of

As shown in FIGS. 1 and 3, a plurality of holes 5 are formed through the main vibrator 3 . A circular area surrounded by a plurality of holes 5 is a fixing area S, and the transmission support 22 of the vibrating device 2 shown in FIG. The plurality of holes 5 are long holes that are arranged at a constant angle so as to surround the fixing region S and extend radially from the center of the fixing region S. As shown in FIG. However, the hole 5 may be a round hole or the like.

As shown in FIG. 2, in the sound generating device 1 of the embodiment, an elastic force is provided between the front end (lower end in the figure) of the side wall portion 15c of the second holding member 15b constituting the mass portion 10 and the surface of the main vibration body 3. Body 6 intervenes. The elastic body 6 is adhered and fixed to both the tip portion of the side wall portion 15 c and the surface of the main vibration body 3 . The elastic body 6 is made of a soft elastic material such as foamed resin, and the elastic modulus of the elastic body 6 with respect to deformation in the illustrated vertical direction is lower than the elastic modulus of the damper 31 with respect to deformation in the illustrated vertical direction. preferable. Note that the elastic body 6 may not necessarily be provided.

Next, the sounding operation of the sounding device (speaker) 1 using the vibrating device 2 of the first embodiment of the present invention will be described.

When a voice current is applied to the coil 23, the mass section 10 and the vibration transmitting section 20 are moved by the electromagnetic force excited by the voice current and the magnetic field that crosses the coil 23 and acts on the coil 23 in the magnetic circuit section 11. , try to vibrate in mutually repulsive directions in the vertical direction shown in FIG. The energy due to the reaction force of the vibration of the mass part 10 at this time is given to the main vibrating body 3 from the transmission supporting body 22 of the vibration transmitting part 20, and the main vibrating body 3 is vibrated to generate sound pressure, and the vehicle interior is given a sound.

Further, when a high-frequency voice current is applied to the coil 23, the amplitude of the soft and lightweight vibrating sheet 32 increases, and the sound pressure generated by the vibration of the vibrating sheet 32 increases. Passing through the formed hole 5, a relatively high-pitched sound is imparted to the interior of the vehicle.

This sound generator 1 is capable of generating clear sound with high output in a wide frequency band. When the frequency of the vibration generated by the vibrating device 2 is relatively low, the vibration characteristics of a wide area including the fixed area S surrounded by the plurality of holes 5 of the main vibrator 3 and the area outside the plurality of holes 5 are obtained. Sound pressure is generated in the dependent vibration modes, producing high-powered sound in the relatively mid-range. When the vibration frequency is higher than that, sound pressure is generated in a vibration mode that depends on the vibration characteristics of the area surrounded by the plurality of holes 5 of the main vibrating body 3, and the sound pressure is in a slightly higher band in the middle sound range. can increase Furthermore, when the frequency of vibration increases, sound pressure is generated in a vibration mode that depends on the vibration characteristics of the vibration sheet 32, making it possible to increase the sound pressure in a relatively high-pitched range. Due to this three-way vibration characteristic, high output sound can be generated in a wide frequency band.

In the sound generating device 1 shown in FIG. 2, the elastic body 6 closes the space between the front end (lower end) of the side wall portion 15c of the second holding member 15b and the surface of the main vibrating body 3 constituting the mass portion 10 . Since the elastic body 6 is made of a material whose elastic modulus is sufficiently lower than that of the damper 31, the damping effect of the elastic body 6 is negligible. However, since the gap between the tip of the side wall portion 15c of the second holding member 15b and the main vibrating body 3 is covered with the elastic body 6, there is a positive/negative relationship between the internal space and the external space of the vibrating device 2. Prevents pressures from interfering with each other. Further, sound pressure in a high sound range due to the vibration of the vibration sheet 32 can be effectively sent out from the hole 5 into the passenger compartment.

A second embodiment of the invention is shown in FIGS. In the second embodiment, a sound generator (speaker) 101 is composed of an acoustic vibrating device 102 and a main vibrator 3 .

As shown in FIG. 5 , also in this vibrating device 102 , the mass section 10 is composed of the magnetic circuit section 11 and the holding member 15 . The magnetic circuit section 11 is composed of a magnet 12 , a first yoke 13 and a second yoke 14 . The vibration transmitting section 20 is composed of a bobbin 21 and a transmission support 22. A coil 23 is wound around one end of the bobbin 21. is inserted inside the A damper 31 is provided between the holding member 15 of the mass portion 10 and the outer peripheral surface of the bobbin 21 . The structure and material of the damper 31 are the same as those of the first embodiment shown in FIG.

As shown in FIG. 5, the transmission support 22 constituting the vibration transmitting portion 20 has a cylindrical portion 22a extending upward in the drawing, and a hole 22b is formed at the top of the cylindrical portion 22a. A lower end portion, which is the other end portion of the bobbin 21, is adhered and fixed to the outer peripheral surface of the cylindrical portion 22a.

A vibration sheet 132 is provided inside the cylindrical portion 22a. The vibrating sheet 132 is made of the same material as the vibrating sheet 32 of the first embodiment shown in FIG. The vibrating sheet 132 has a dome shape with a projecting direction downward in the drawing, and a skirt portion 132a is fixed by bonding to the inner surface of the cylindrical portion 22a of the transmission support 22 around the hole 22b. The vibration sheet 132 is provided at a position facing the internal space of the bobbin 21 or blocking the internal space. The vibrating sheet 132 may have a skirt portion 132a adhered to the inner peripheral surface of the midsection of the bobbin 21, or the skirt portion 132a may be adhered to the opening at the lower end of the bobbin 21, and the dome-shaped vibrating sheet 132 may It may protrude downward in the drawing from the opening at the lower end of the bobbin 21 .

The main vibrator 3 used in the sound generating device 101 of the second embodiment is the roof interior material of the passenger compartment or the like, as in the first embodiment. As shown in FIG. 5, a circular hole 105 is formed through the main vibrator 3 . In the sound generating device 101 , the transmission support 22 of the vibrating device 102 is adhered and fixed to the surface of the main vibration body 3 around the hole 105 , and the hole 105 faces the vibration sheet 132 .

Next, the sounding operation of the sounding device (speaker) 101 using the vibrating device 102 of the second embodiment will be described.

Due to the electromagnetic force generated by the voice current flowing through the coil 23 and the magnetic field acting on the coil 23 across the coil 23 in the magnetic gap G, the mass section 10 and the vibration transmitting section 20 are excited to vibrate in opposite directions. be. The reaction force of the vibration of the mass part 10 acts on the main vibrating body 3 such as the interior material via the vibration transmitting part 20, vibrating the main vibrating body 3, and applying sound pressure to the interior of the vehicle. The main vibrator 3 normally generates sound pressure in the midrange due to its unique vibration mode.

When high-frequency vibration is excited, the vibration acts on the vibration sheet 132 via the bobbin 21, or the change in the internal pressure of the bobbin 21 due to the vibration acts on the vibration sheet 132, causing the vibration sheet 132 to A high frequency sound pressure is generated and emitted into the passenger compartment through the hole 105 . The vibration of the vibrating sheet 132 makes it possible to widen the sounding frequency band of the sound generating device 101 to the high frequency side.

1 sound generator 2 vibrator 3 main vibration body 5 hole 10 mass section 11 magnetic circuit section 12 magnet 15 holding member 20 vibration transmission section 21 bobbin 22 transmission support body 23 coil 31 damper 32 vibration sheet 101 sound generator 102 vibration same ground 132 vibration seat

Claims (6)

A magnetic circuit section including a magnet, a mass section including the magnetic circuit section, a coil on which a magnetic field generated by the magnetic circuit section acts, a vibration transmission section supporting the coil, the mass section and the vibration transmission section. In an acoustic vibrating device comprising a damper provided between
A vibrating device for sound, wherein a vibrating sheet is provided between the mass portion and the vibration transmitting portion, the vibrating sheet being located in front of the damper in a direction of sound generation. A bobbin that supports the coil is provided in the vibration transmission unit,
2. An acoustic vibrating device according to claim 1, wherein said vibrating sheet has a ring shape positioned around said bobbin. 3. The acoustic vibrating device according to claim 1 , wherein the vibration sheet is made of a material having bending rigidity lower than that of the damper. 4. The acoustic vibrating device according to any one of claims 1 to 3 , wherein the vibration sheet is made of a material having a smaller mass per unit area than the damper. A sound generator provided with an acoustic vibrating device according to any one of claims 1 to 4 and a main vibrating body on which the vibrating device is installed,
The vibration transmitting portion is provided with a transmission support fixed to the main vibrating body,
A sound generating device, wherein the main vibrator is formed with a plurality of holes arranged so as to surround a fixing area to which the transmission support is fixed. A sound generator provided with an acoustic vibrating device according to any one of claims 1 to 4 and a main vibrating body on which the vibrating device is installed,
The vibration transmitting section is provided with a bobbin that supports the coil and a transmission support that fixes the bobbin to the main vibrator,
A sound generating device, wherein the main vibrating body is formed with a hole facing the vibrating sheet.

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