JPH04330900A - Vibration unit and manufacture thereof, and sensible acoustic device - Google Patents

Abstract

PURPOSE:To provide a thin and small sensible acoustic device with good excitation efficiency and vibration propagation efficiency and its vibration unit which can be fitted to the space, etc., formed in the crossing position of the sitting part and the back part of the seat of an automobile. CONSTITUTION:A cross section U-shaped vibration propagation frame 1 fitted with a voice coil 2, a plate damper 8 positioned so as to be horizontal to the voice coil 2 and constituted of a slender flat plate fitted separately from the both tip parts of the vibration propagation frame 1, and a yoke 7 fitted to the central part of the plate damper 8 are equipped, and the vibration is constituted to be obtained by the magnetic interference effect that occurs between the magnetic force to be generated from the voice coil 2 accompanying the audio signal of the bass area and the magnetic force of a magnetic pole 6.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] In order to make deep bass sounds more ideal, the present invention provides an audio reproduction effect by air propagation from a speaker, as well as an audio signal that drives the speaker. , for example 150Hz
A vibration unit that generates mechanical vibrations to enhance the sense of reality by converting the following low-frequency audio signals into mechanical vibrations and experiencing the vibrations in synchronization with speaker playback; The present invention relates to a method of manufacturing the vibration unit and a sensory acoustic device using the vibration unit. In particular, it is a compact vibration unit that can be installed in a limited space such as the space created at the intersection of the seat and backrest when a person sits on a car seat. A sound device is provided.

0002

[Prior Art] Conventionally, in this type of vibration unit,
A magnetic air gap is formed by a yoke with a magnetic pole, and the voice coil is placed within this air gap, and the magnetic force generated in the voice coil due to the low-frequency audio signal applied to the voice coil and the magnetic force of the magnetic pole are A structure has been proposed in which mechanical vibration is obtained by the magnetic interference effect generated between the two.

One way to propagate (output) the mechanical vibrations of this vibration unit to a diaphragm or the like is to provide a threaded rod at the center of the vibration member to which a bobbin around which a voice coil is wound is attached, and to transmit the mechanical vibration through this threaded rod. There is a structure that outputs physical vibration to a diaphragm or the like. (For example, Tokuko Sho 42-2
(Refer to Publication No. 2997)

[0004] As another vibration output means, the yoke is held in the case body of the vibration unit via a damper, and the yoke and the case body are configured to be relatively displaced, and the case body is used as a mounting member. There is a structure that outputs mechanical vibration by attaching it to a diaphragm etc. (
For example, see Japanese Patent Publication No. 58-9640)

0005
] In the latter type of vibration unit, which is structured to output mechanical vibration through the case body, it is necessary to hold the yoke so that it can move in the vibration direction within the case body. The holding means for this yoke is a damper placed horizontally to the voice coil within a plane including the gap where the voice coil is located (for example, see Japanese Patent Publication No. 58-9640). ),
Or one using two dampers (for example,
-33799)).

Furthermore, as other yoke holding means, there are those that hold the yoke using a spring member provided inside the case body (for example, see Japanese Patent Laid-Open No. 61-67400), and those that use this spring member. Those with a U-shaped bent structure (
For example, JP-A No. 63-197198, especially No. 3
(see figure and explanation).

There is also a structure in which the yoke held by the damper is further supported slidably in the vibration direction using a ball bearing or a guide member whose inside is coated with Teflon. (For example, see Japanese Patent Application Laid-open No. 58-215200)

It has been proposed to construct a sensory acoustic device using a vibration unit having the above-described structure. Among these sensory acoustic devices, there are devices that are attached to automobile seats, sofas, chairs, etc. at home. One way to attach a sensory acoustic device to a car seat, etc. is to
Some devices utilize the space created at the intersection of the seat and backrest when a person sits on the seat. (for example,
(Refer to Special Publication No. 57-9273)

[0009] In this way, in order to be able to mount the sensory acoustic device in the small, limited space created at the intersection of the seat and the backrest of the seat without causing discomfort, a vibration unit is installed. Some devices are built into the thick part of a flat or triangular diaphragm to reduce its thickness. (For example, see Japanese Patent Publication No. 57-9273)

Furthermore, as a means for efficiently improving the realistic sensation reproduction effect without using a plurality of vibration units in a sensory acoustic device, a belt-shaped vibration transmission plate made of pressboard or the like, urethane chips, foamed polyurethane, etc. are used. and a vibrating member made of
Some devices have a structure in which a vibration unit is buried in this insertion hole. (For example, see Utility Model Publication No. 61-34795)

[
0011

[Problems to be Solved by the Invention] Among conventional vibration units, those having a structure in which a yoke is held within a case body via a single ring-shaped damper have a magnetic circuit consisting of a magnet, a yoke, etc. The positional relationship with the bobbin is 1
Because the voice coil bobbin is held only by two ring-shaped dampers, the magnetic circuit and the voice coil bobbin, which are always relatively displaced in the excitation direction when vibration occurs, are misaligned with respect to the non-excitation direction, that is, twisted. The voice coil bobbin and the yoke of the magnetic circuit come into contact with each other, causing problems such as abnormal noise. This is particularly a serious problem for speakers that have a structure that vibrates a heavy magnetic circuit, unlike general speakers that vibrate a lightweight voice coil bobbin. One way to solve this problem is to set a wide gap between the voice coil bobbin, yoke, and pole piece in advance to absorb the above-mentioned positional deviation. If the gap is widened, the mutual magnetic influence will be reduced, which will affect the electromagnetic performance and have the disadvantage of significantly lowering the excitation efficiency.

[0012] As another means for solving such inconveniences, a structure has been proposed in which two dampers are used to support the magnetic circuit such as the yoke. Then, due to the resonance between the dampers,
Abnormal vibration may occur.

Furthermore, in order to solve the above-mentioned problems, there is a structure in which one side of the magnetic circuit such as a yoke is supported via a damper, and the other side is supported using a guide member. Since the magnetic circuit is held using two members, there is a drawback that the structure of the vibration unit itself becomes large. In addition, as a damper that holds the magnetic circuit of a large-amplitude vibration unit that allows you to experience deep bass below 150 Hz, it is necessary to use a thick ring-shaped damper with a relatively large area, which complicates the damper holding structure. At the same time, it is difficult to downsize the vibration unit.

Further, as a yoke holding structure using other means, there is a structure in which a ring-shaped spring member is attached to the outer periphery of the yoke, and the yoke is supported by the case body by this ring-shaped spring member. Similar to the structure using one damper described above, this also has the disadvantage that the voice coil bobbin and the magnetic circuit are misaligned with respect to the non-excitation direction. If the ring-shaped spring material is made thicker in order to eliminate this inconvenience, the vibration operation of the magnetic circuit will be suppressed, which will not only impair the excitation efficiency but also increase the resonant frequency f0.

There is also a structure in which the yoke is suspended from a spring member bent into a U-shape, but in this structure, one end of the U-shaped spring member is attached to a cantilever inside the case body. Due to this structure, when the suspended yoke vibrates, the spring member may shift toward the mounting direction, and the yoke may come into contact with the voice coil, causing abnormal noise. In addition, since the yoke is suspended by a spring member, it is very difficult to align it with the voice coil, and it is easily affected by external shocks, and the case itself is large. It is unsuitable for use as a vibration unit.

[0016] Furthermore, among conventional vibration units, for those with a structure in which the case body is configured as an attachment member to the diaphragm and mechanical vibration is output to the diaphragm through the case body, one vibration unit is sufficient. In order to obtain enough vibration output to experience deep, deep bass, it is necessary to use large components for each component that makes up the magnetic circuit, and as a result, the case that encases it must also be large, making it extremely difficult to miniaturize the structure. Met. Furthermore, since the structure is such that vibrations are transmitted through the case body to the diaphragm, and from the diaphragm to the human body, the vibration propagation efficiency is poor.

[0017]Also, in order to reduce the size of the sensory acoustic device, there has been a proposal for a structure in which the vibration unit is buried within the thick wall of the diaphragm. In order to bury the vibration unit, it is necessary to make the vibration unit itself thin and compact. Even if it were possible to manufacture a thin and small vibration unit, a vibration unit that is large enough to be buried inside the thick part of the diaphragm would not be able to obtain enough vibration output to experience a satisfying deep bass sound. This method is difficult and requires the use of a plurality of vibrating units, resulting in high costs.

The present invention provides a new vibration unit that improves the various problems of the conventional vibration unit described above, in which the yoke and the voice, which constantly fluctuate relative to each other in the excitation direction during excitation operation, are provided. In addition to preventing the displacement of the positional relationship with the coil bobbin in the non-excitation direction, that is, the twisting phenomenon, the excitation efficiency and vibration propagation efficiency are improved, and it is possible to obtain sufficient deep bass vibration, while being thin and compact. The purpose is to provide a vibrating unit that is possible. Furthermore, the vibration unit of the present invention is thin and compact, and can be configured to have a horizontally long shape, so that when a person sits on a car seat or a chair, the seat and back The object of the present invention is to provide a small-sized sensory acoustic device with a large vibration output, which can be installed in a space formed at an intersecting position with a corresponding part and easily sense deep bass vibrations synchronized with the sound reproduced by a speaker.

[0019]

[Means for Solving the Problems] In order to achieve the above object, in the structure of the vibration unit of the present invention, a vibration propagation frame to which a voice coil is attached, a vibration propagation frame positioned horizontally to the voice coil, The damper is composed of an elongated flat plate damper whose both ends are supported by a vibration propagation frame at a distance, and a yoke attached to the center of the plate damper. The vibration propagation frame has a voice coil and a space having a U-shaped cross section.
It has a built-in yoke and a plate damper that horizontally supports the yoke. Further, the plate damper is made of an elongated flat metal material with a rectangular cross section. Further, the plate damper has both ends supported so as to swing in the excitation direction, and a buffer portion is formed by bending symmetrical positions on both sides of the yoke attachment position in the excitation direction. In addition, when this vibration unit is used in a sensory acoustic device, it is more effective to curve the vibration output side of the vibration propagation frame to improve contact with a person's lower back.

[0020] In the method of manufacturing the vibrating unit constructed as described above, first, a yoke having a magnetic pole is attached to the center of an elongated flat plate damper. Next, the plate damper is inserted into the vibration propagation frame, which has a U-shaped cross section, with the gap in the yoke facing upward, and the plate damper is positioned horizontally to the voice coil. Install both ends away from the vibration propagation frame. Furthermore, there is a manufacturing method in which the voice coil is placed in the magnetic gap of the yoke and its position is adjusted, and then the voice coil is attached to the vibration propagation frame.

[0021] Furthermore, in the sensory acoustic device of the present invention,
This objective was achieved by covering the periphery of the vibration unit of the present invention with a cushioning material that prevents vibrations from being suppressed. This covered cushioning material is provided with a ventilation hole in a portion that corresponds to at least one side edge of the vibration propagation frame, so that the heat stored in the space of the vibration propagation frame, which has a U-shaped cross section, is removed. The structure allows heat to be radiated from the sides through the space and ventilation holes.

[0022]

[Operation] When a low frequency audio signal is applied to the voice coil of the vibration unit configured as above, a magnetic force is generated in the voice coil due to the applied audio signal, and a magnetic force is generated between the voice coil and the magnetic force of the magnetic pole. Due to the magnetic interference, the yoke supported by the elongated flat plate damper and the vibration propagation frame are displaced relative to each other, and mechanical vibration is generated. This mechanical vibration is propagated throughout the laterally long vibration propagation frame. The vibrations generated in this way are generated based on the audio signals played from the speakers, so they are synchronized with the sound played by the speakers, and they are also caused by the audio signals in the bass range, so they can produce deep bass sounds. It is an effective vibration when felt by the body.

[0023]

[Example] An example will be described with reference to the drawings. FIG. 1 is a sectional view showing the basic configuration of the vibration unit of the present invention.
FIG. 2 is a plan view. Reference numeral 1 denotes a vibration propagation frame, which is made of a metal material such as aluminum. A voice coil 2 is arranged in the center of this vibration propagation frame 1. The voice coil 2 is wound around the bobbin 3.
The insulating substrate 4 fitted and attached to the vibration propagation frame 1 is firmly fixed to the vibration propagation frame 1. 5 is a terminal connected to the voice coil 2, and a low frequency audio signal applied to this terminal 5 is supplied to the voice coil 2.

Next, the yoke 7 provided with the magnetic pole 6 will be explained. The yoke 7 is formed of a cylindrical member having a concave cross section, and the magnetic pole 6 is fixed in a loosely fitted state at the center of the yoke. Therefore, a magnetic annular gap is formed between the outer periphery of the magnetic pole 6 and the inner wall surface of the cylindrical member having a concave cross section, thereby forming a magnetic circuit. The voice coil 2 is placed within this gap. The yoke 7 is fixed to the center of the plate damper 8 so that the voice coil 2 can always be placed in the correct position within the air gap.

The plate damper 8 has a rectangular cross-sectional shape to prevent twisting in the non-excitation direction, and is made of a sufficiently thick and elongated plate-shaped elastic plate made of metal such as aluminum, brass, or stainless steel. Both ends 8A and 8B are attached to the vibration propagation frame 1 at a distance. The plate damper 8 is mounted so that the plate damper 8 itself is positioned horizontally with respect to the voice coil 2. Further, both ends 8A and 8B of this plate damper 8 have an attachment structure that swings in the excitation direction.

[0026] In the vibration unit configured as described above, when a low-frequency audio signal is applied to the voice coil 2, the voice coil 2 vibrates based on the applied audio signal.
A magnetic force is generated. Due to the magnetic interference generated between the magnetic force of the voice coil 2 and the magnetic force of the magnetic pole 6, the yoke 7 supported by the plate damper 8 and the vibration propagation frame 1 to which the voice coil 2 is attached are displaced relative to each other. mechanical vibrations occur. This mechanical vibration is propagated throughout the vibration propagation frame 1. Therefore, this vibration can be output from the surface of the vibration propagation frame 1 located in the excitation direction. The vibrations generated in this way are generated based on the audio signals played from the speakers, so they are synchronized with the sound played by the speakers, and the vibrations are caused by audio signals in the low frequency range.
It is effective as a vibration when you feel deep bass sounds with your body.

Next, a method of manufacturing a vibration unit according to the present invention will be explained based on an embodiment shown in a partially cutaway perspective view of FIG. 3 and a sectional view of FIG. 4. First, the yoke 7 provided with the magnetic pole 6 is attached to the center of the plate damper 8, which is a sufficiently thick and elongated flat plate. Next, the plate damper 8 is inserted into the vibration propagation frame 1 having a U-shaped cross section with the gap of the yoke facing upward. The plate damper 8 inserted into the space of the vibration propagation frame 1 is positioned horizontally with respect to the voice coil 2, and both ends 8A and 8B of the plate damper 8 are separated from the inner wall surface of the vibration propagation frame 1. Install it in the same position. moreover,
The voice coil 2 is placed within the magnetic gap of the yoke 7 and the mounting position is adjusted. This position adjustment is performed by moving the fixed plate 9 to which the insulating substrate 4 of the voice coil 2 is attached. After the position adjustment is completed, the fixed plate 9 is attached to the vibration propagation frame 1, and the assembly work is completed.

Next, we will discuss the mounting structure of the plate damper 8, which is a sufficiently thick and elongated flat plate used in the vibration unit of the present invention. An embodiment of a structure in which the parts 8A and 8B are attached so as to swing in the vibration direction will be described based on FIGS. 5 to 8. First, a first embodiment shown in a plan view of the main part in FIG. 5 and a sectional view of the main part in FIG. 6 will be described. In the mounting structure of the first embodiment, a shaft mounting portion 10 is provided at an end 8A of the plate damper 8 (the other end 8B side is configured in the same manner, so a description thereof will be omitted). At the same time, the shaft rod 11 is attached to the shaft mounting portion 10.
Insert and secure. Both ends of the fixed shaft rod 11 can swing in the vibration direction and cannot move in the non-vibration direction by bearings 12 provided on the upright side walls 1A and 1B of the vibration propagation frame 1. It is pivoted so that there is no damage. Therefore, the plate damper 8 is displaced in the excitation direction based on the vibration motion of the yoke 7, and the end portion 8 is displaced in accordance with this displacement.
A and 8B can be swung. Also, this bearing 1
2 has a ball bearing structure, both ends 8A and 8B of the plate damper 8 can be made to swing more smoothly, and when the plate damper 8 is vibrating, the vibrations can cause damage to the bearing part. This makes it possible to reliably prevent abnormal noises that may occur.

Next, a second embodiment shown in a plan view of the main part of FIG. 7 will be described. The mounting structure of this second embodiment is as follows:
Pivot bearing 1 to both sides of end 8A of plate damper 8
3 are respectively provided, and the tips of both adjusting screws 14, which are screwed into the pivot bearings 13 and passed through the upright side walls 1A and 1B of the vibration propagation frame 1, are pivotally supported. Therefore, the plate damper 8 is displaced in the excitation direction based on the vibration motion of the yoke 7, and in accordance with this displacement, the end portion 8A
, 8B can be swung.

Further, a third embodiment shown in the block diagram of FIG. 8 will be explained. This mounting structure uses a spring 15 to tilt both ends 8A, 8B of the plate damper 8 and apply an upward pulling force, and a wedge-shaped support block 16 in contact with the upper surface of both ends 8A, 8B to tilt the plate damper 8. 8 is pushed down to position the plate damper 8. Therefore, the plate damper 8 is displaced in the excitation direction based on the vibration motion of the yoke 7,
The ends 8A, 8B can be swung according to this transition.

FIG. 9 is a configuration diagram showing one embodiment of a plate damper used in the vibration unit of the present invention. The structure of the plate damper shown in FIG. 9 has buffer portions 8C formed by bending in the excitation direction at symmetrical positions on both sides of the yoke 7 attached to the center. The plate damper 8 is
As the yoke 7 vibrates, it moves like a piston in the vibration direction as shown by the dotted line. As a result of this movement, a pulling force is repeatedly applied to the plate damper 8 toward the center, which may adversely affect, for example, the pivot bearing 13 described in FIG. 7. Therefore, as in this embodiment, the plate damper 8 is provided with a buffer section 8C.
By forming the plate damper 8, when the plate damper 8 is pulled toward the center due to the vibration operation, the pulling force causes the buffer portion 8C to expand slightly toward both ends 8A and 8B, thereby reducing the effective effectiveness of the plate damper 8. It acts to increase the length and absorbs the pulling force applied to the plate damper 8 toward the center. As a result, the pivot bearings 13 and the like provided at both ends 8A and 8B of the plate damper 8 can be prevented from being affected. In order to prevent the vibration waveform propagated through the plate damper 8 from being disturbed at the bent portions, the buffer portion 8C is bent into an arc shape so that no corners are formed at each bent portion. It is desirable that

FIG. 10 is a plan view showing another embodiment of the vibration unit of the present invention, and shows an embodiment constructed by partially modifying the vibration unit shown in FIG. 3. The vibration unit shown in FIG. 10 has a structure particularly suitable for use in an automobile sensory acoustic device. The feature of this vibration unit is that both ends 1 of the vibration propagation frame 8
7 and 18 are further extended and the side that outputs vibration in the excitation direction is curved inward. In this way, by curving both ends 17 and 18 of the vibration propagation frame 8 inward, it is possible to improve the fit to the waist of the person experiencing the vibration, and the vibration output can be transmitted more reliably.

By integrally attaching the diaphragm 19 shown in FIGS. 11 and 12 to the curved surface formed on the vibration propagation frame 8, in addition to the vibration propagation effect of the vibration propagation frame 8 itself, it is possible to spread the vibration over a wider range. It is possible to propagate vibrations to. Although the vibration unit of the present invention described above is thin and small, it has extremely high vibration efficiency and vibration propagation efficiency, and can output powerful vibrations. Small diaphragm 19
By simply adding , a greater vibration propagation effect can be obtained.

FIG. 13 is a sectional plan view showing a first embodiment of the sensory acoustic device of the present invention. This sensory acoustic device is
The periphery of the vibration unit shown in FIG. 3 is covered with a cushioning material 20 to prevent the vibration of the vibration unit from being suppressed. Therefore, the vibration of the vibration unit is
Vibrations are output in the direction of arrow a and transmitted to the human body. This vibration output is synchronized with the sound reproduced by the speaker and is based on the audio signal in the bass range, so it is effective as a vibration when feeling deep bass sounds with the body.

The cushioning material 20 has ventilation holes 22 for heat radiation.
is provided. A plurality of these ventilation holes 22 are provided in portions corresponding to both end edges of the vibration propagation frame 8. Therefore, the heat generated in the voice coil 2 and stored in the space of the U-shaped cross section of the vibration propagation frame 8 is transferred to the direction indicated by the arrow b.
As shown in , heat can be radiated through the ventilation holes 22 provided on both sides through a space having a U-shaped cross section. Therefore, even when the sensory acoustic device configured as shown in FIG. 13 is installed in the space at the intersection of the seat portion 23A and the backrest portion 23B of a car seat as shown in FIG. Since they are formed on both sides of the sensory acoustic device, they do not interfere with heat dissipation. Note that 21 is a cover that covers the surroundings of the cushioning material 20 in order to enhance the design effect.

FIG. 15 is a sectional plan view showing a second embodiment of the sensory acoustic device of the present invention. This sensory acoustic device is
Figures 11 and 12 to the vibration output side of the vibration unit in Figure 10.
In the structure in which a diaphragm 19 is attached, the periphery thereof is covered with a cushioning material 20, and the periphery thereof is further covered with a cover 21. In addition to providing both ends 17 and 18 of the vibration propagation frame, this sensory acoustic device can increase the effective vibration area by attaching a diaphragm 19, and can spread vibrations with the same phase over a wide range. Obtainable. In addition, even when attached to a car seat as shown in Figure 16, the vibration unit main body is thin and small,
Furthermore, since the diaphragm 19 can also be thin and small, the entire device can be made thin and small, and the person sitting on the device will not feel any discomfort at all.

[0037]

Effects of the Invention As described above, the vibration unit of the present invention can fix the yoke in advance to the center of the elongated flat plate damper, so that the plate damper can be moved horizontally to the voice coil. By simply attaching both ends of the yoke to the vibration propagation frame, the mounting position of the yoke can be determined, and the positional relationship can be determined accurately and quickly. In addition, a long and thin plate damper with a yoke attached to the center is positioned horizontally to the voice coil, and both ends of the plate damper can be swung in the excitation direction. Because it is attached, there is no need to install two dampers or a guide to support the lower end of the yoke as with conventional vibration units.
The voice coil can be prevented from coming into contact with the yoke, and the yoke can be stably vibrated relative to the voice coil. Furthermore, since we used an elongated flat plate damper, by selecting and calculating the material, thickness, and dimensions of the beam part of the plate damper in advance,
It becomes possible to move the lowest resonant frequency to a lower frequency side, and it is possible to obtain an appropriate vibration output in the bass range. In addition, since the plate damper is made of a sufficiently thick and elongated flat plate and a metal member with a rectangular cross section, displacement of the yoke in the non-excitation direction can be suppressed, and the installation position of the magnetic circuit can be controlled. Not only can it prevent misalignment, but it can also be easily attached to the vibration propagation frame.
In addition, since the vibration propagation frame and the plate damper can be constructed as strongly as if they were integrally formed, it is possible to obtain a vibration unit with a structure that is strong against external shocks. Furthermore, by forming a buffer part in the plate damper, the tension of the plate damper toward the center due to the vibration operation can be absorbed by increasing the effective length of the plate damper. Therefore, it is possible to prevent an adverse effect on the support structure at both ends of the plate damper.

Furthermore, by using a horizontally long vibration propagation frame having a U-shaped cross section, the yoke, magnetic pole, voice coil, and plate damper can be built into the space having a U-shaped cross section. Therefore, the shape of the entire vibration unit can be made laterally long, and the thickness in the vibration direction can be made thin. In addition, since the vibration propagation frame can be directly covered with a cushioning material, the structure is not only extremely simple, but the overall thickness of the sensory acoustic device can be reduced, making it possible to Even if it is installed in a limited space such as the space created at the intersection of the seat and backrest, it will not affect the comfort of sitting. In addition, the surface shape of the backrest, of course,
It can be reliably fitted to the shape of the space in which it is mounted, and it can be easily integrated with the seat. Even when the above-mentioned sensory acoustic device is installed in the space of a car, the heat accumulated inside can be radiated through the ventilation holes from both sides. Unlike the vibration unit described above, which has a structure in which a ventilation hole is provided in the vibration direction, there is no possibility that the ventilation hole will be closed even if there is a body or a seat in the vibration direction.

Furthermore, by employing the above-described manufacturing method as a method for manufacturing the vibration unit of the present invention,
It is structurally possible to attach the yoke to the center of the plate damper and to attach the voice coil to the fixed plate in advance during the preparatory process. Simply insert a plate damper with a yoke, install it with both ends of the plate damper separated from the inner wall of the vibration propagation frame, adjust the mounting position of the fixed plate with voice coil, and attach it to the vibration propagation frame. It is extremely easy to assemble and has a structure suitable for mass production.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view showing the basic configuration of a vibration unit of the present invention.

FIG. 2 is a plan view showing the basic configuration of the vibration unit of the present invention.

FIG. 3 is a partially cutaway perspective view showing one embodiment of the vibration unit of the present invention.

FIG. 4 is a cross-sectional side view of the embodiment shown in FIG. 3;

FIG. 5 is a plan view of essential parts showing a first embodiment of a mounting structure for a plate damper used in the vibration unit of the present invention.

FIG. 6 is a sectional side view of a main part of the embodiment shown in FIG. 5;

FIG. 7 is a plan view of main parts showing a second embodiment of a mounting structure for a plate damper used in the vibration unit of the present invention.

FIG. 8 is a configuration diagram showing a third embodiment of a plate damper mounting structure used in the vibration unit of the present invention.

FIG. 9 is a configuration diagram showing an example of the structure of a plate damper used in the vibration unit of the present invention.

FIG. 10 is a plan view showing a second embodiment of the vibration unit of the present invention.

FIG. 11 is a front view showing one embodiment of a diaphragm used in the vibration unit of the present invention.

FIG. 12 is a plan view of the embodiment shown in FIG. 11;

FIG. 13 is a cross-sectional plan view showing a first embodiment of the sensory acoustic device using the vibration unit of the present invention.

FIG. 14 is a perspective view showing an example of a state in which the sensory acoustic device of FIG. 13 is attached to a seat of an automobile.

FIG. 15 is a cross-sectional plan view showing a second embodiment of the sensory acoustic device using the vibration unit of the present invention.

16 is a perspective view showing an example of the sensory acoustic device of FIG. 15 attached to a seat of an automobile.

[Explanation of symbols]

1 is a vibration propagation frame. 2 is a voice coil. 3 is a bobbin. 4 is an insulating substrate. 5 is a terminal. 6 is a magnetic pole. 7 is a yoke. 8 is a plate damper. 8A and 8B are the ends. 8C is the buffer part 9 is a fixed plate.

Claims (9)

[Claims] Claim 1: A magnetic air gap is formed by a yoke equipped with magnetic poles, a voice coil is disposed within this air gap, and the magnetic force generated in the voice coil due to a low-frequency audio signal applied to the voice coil and , in a vibration unit configured to obtain mechanical vibration by magnetic interference generated between the magnetic force of a magnetic pole, a vibration propagation frame to which a voice coil is attached, and a vibration propagation frame positioned horizontally with respect to the voice coil, and A vibration unit comprising: an elongated flat plate damper whose ends are supported by a vibration propagation frame at a distance; and a yoke attached to the center of the plate damper. 2. The vibration unit according to claim 1, wherein the plate damper is made of an elongated flat metal material having a rectangular cross-section. 3. Both ends of the plate damper are positioned apart from the inner wall surface of the vibration propagation frame, and
The vibration unit according to claim 1, wherein at least one end of the plate damper is attached to swing in the vibration direction. 4. A buffer section is formed by bending symmetrical positions on both sides of the yoke attachment position of the plate damper in the excitation direction, and the effective length of the plate damper is reduced so that the plate damper is pulled toward the center due to the excitation operation. 2. The vibration unit according to claim 1, wherein the vibration unit is configured to absorb the vibration by increasing the vibration. [Claim 5] A voice coil, a magnetic circuit including a yoke, and a plate damper that horizontally supports the yoke are built into the space of the vibration propagation frame having a U-shaped cross section. The vibration unit according to claim 1. 6. The vibration unit according to claim 1, wherein the vibration output side of the vibration propagation frame is formed by being curved. 7. A first process of attaching a yoke with a magnetic pole to the center of a long and thin plate-shaped plate damper, and a step of attaching the plate with the gap of the yoke facing upward into a vibration propagation frame having a U-shaped cross section. a second step of inserting the damper, positioning the plate damper horizontally with respect to the voice coil, and attaching the plate damper with both ends separated from the vibration propagation frame;
A method for manufacturing a vibration unit comprising the steps of arranging a voice coil in the magnetic gap of a yoke and adjusting its position, and then attaching the voice coil to a vibration propagation frame. 8. A magnetic air gap is formed by a yoke equipped with magnetic poles, a voice coil is placed in this air gap, and the magnetic force generated in the voice coil due to a low-frequency audio signal applied to the voice coil and , a vibration unit configured to obtain mechanical vibration through magnetic interference generated between the magnetic force of a magnetic pole, and a vibration propagation frame with a U-shaped cross section to which a voice coil is attached, and a vibration propagation frame with a U-shaped cross section attached to the voice coil. The periphery of a vibration unit consisting of an elongated flat plate damper, which is positioned horizontally and supported by a vibration propagation frame with both ends spaced apart from each other, and a yoke attached to the center of the plate damper. A sensory acoustic device characterized by being coated with a cushioning material that prevents vibrations from being suppressed. 9. A ventilation hole is provided in a portion of the cushioning material that corresponds to at least one edge of the vibration propagation frame having a U-shaped cross section, so that the heat stored in the space having a U-shaped cross section of the vibration propagation frame is dissipated. 9. The sensory acoustic device according to claim 8, characterized in that it is configured to radiate heat from the sides through a space having a U-shaped cross section and a ventilation hole.