JPH0716277B2 - Vibration generator structure and acoustic device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration generator used as a vibration source of a sensation-based acoustic device, and an acoustic device capable of more ideally listening and experiencing deep bass using the vibration generator. It is about.

[0002]

2. Description of the Related Art In order to make it possible to sense a deep bass more ideally, in addition to an audio reproduction effect by air propagation from a speaker, an audio signal for driving the speaker, for example, 150 Hz or less Various types of sensible audio devices have been proposed which convert a low-pitched range audio signal into mechanical vibrations and allow the user to experience the vibrations in synchronization with speaker reproduction, thereby further enhancing the sense of presence.

Conventionally, as a vibration generator used in this type of acoustic device, a magnetic gap is formed by a yoke having magnetic poles, and a voice coil is arranged in this gap.
Various types have been proposed in which mechanical vibration is obtained by a magnetic interference action generated between a magnetic force generated in a voice coil and a magnetic force of a magnetic pole accompanying a bass audio signal applied to the voice coil. (For example, Japanese Patent Publication Sho 5
(See Japanese Patent Publication No. 8-9640)

It has also been proposed to attach a vibration generator to a wall or ceiling in a room by screwing or the like and directly vibrate the wall or ceiling to radiate sound waves into the air for audio reproduction. (For example, Jitsuko Sho 45-2346
(See Publication No. 6)

Further, a vibration floor is also proposed in which a vibration generator is attached to the floor by screwing or the like.
(See, for example, JP-A-56-122097)

Further, the vibration generator is provided with leg portions made of elastic material so that it can be placed on the floor, and the vibration generated by the vibration generator is transmitted to the floor through the leg portions so that the user can feel it. Things are also proposed. (For example, the actual exploitation 63
(See Japanese Patent Publication No. 138795)

[0007]

When transmitting the vibration generated by the vibration generator to the floor, for example, when the vibration generator is simply placed on the floor, when the vibration level is large, the vibration is generated by the reaction with the floor. Incomplete contact between the body and the floor. Therefore, in the above-mentioned conventional example, the vibration generator is screwed and fixed to the floor, or the leg portion made of the elastic body is provided and placed on the floor to absorb the reaction. .

However, the method using screws is inconvenient because the vibration generator is fixed and the installation location cannot be freely changed. In addition, in a general household,
There was a drawback that it was difficult to implement because there was resistance to the screw holes on the floor plate.

Further, in the vibration generator constructed by providing the leg portion made of an elastic body and placing it on the floor, when the vibration level is increased, the reaction between the leg portion and the floor causes incomplete contact between the leg portion and the floor. Become. Therefore, this method has a drawback in that the level of vibration propagated from the vibration generator to the floor is limited and a large vibration cannot be applied to the floor.

As described above, in the conventional structure of the vibration generator configured to be placed on the floor, only the vibration within the range in which the contact with the floor is not incomplete can be applied to the floor.
It has been difficult to generate heavy bass due to the floorboard, which requires relatively large vibration energy.

The present invention provides a novel structure of a vibration generator and an acoustic device, in which the problems of the conventional structure of the vibration generator are improved, and even when the vibration level of the vibration generator is increased. An object of the present invention is to provide a structure of a vibration generator and an acoustic device capable of reliably maintaining contact with a placed floor, improving vibration propagation efficiency, and obtaining deep bass and sensation vibration.

[0012]

In order to achieve the above object, in the structure of the vibration generator of the present invention, a magnetic gap is formed by a yoke having magnetic poles, and a voice coil is placed in this gap. In a vibration generator arranged to generate mechanical vibration by a magnetic interference action generated between the magnetic force generated in the voice coil and the magnetic force of the magnetic pole accompanying the audio signal applied to the voice coil, A heavy object having a mass exceeding the suction and repulsive force generated by the voice coil is provided through an elastic member.

The heavy object is arranged so as to be loaded in the vibration output direction of the vibration generator.

Further, in order to achieve the above object, the acoustic device of the present invention forms a magnetic gap by a yoke having magnetic poles, arranges a voice coil in this space, and applies the voice coil to this voice coil. It is configured to generate mechanical vibration by the magnetic interference effect generated between the magnetic force generated in the voice coil and the magnetic force of the magnetic pole due to the low frequency range audio signal generated, and the mechanical vibration is propagated to the floorboard. A vibration generator configured as described above, a heavy object having a mass exceeding the suction and repulsive force generated by the voice coil of the vibration object, and an elastic member interposed between the heavy object and the vibration generator. , The low range audio reproduction sound is generated from the floor board.

Further, the vibration output portion of the vibration generator may be provided with a vibration transmission member made of an elastic material for absorbing irregularities on the floor plate surface. Further, the vibration output portion of the vibration generator may be provided with at least three legs having sharp tips and rigidity in order to increase the degree of close contact with the floor plate and improve the vibration propagation efficiency.

[0016]

When a bass audio signal is applied to the voice coil of the vibration generator, a magnetic force is generated in the voice coil along with the applied audio signal, and the magnetic interference between the magnetic force of the magnetic pole causes The yoke and the voice coil are displaced relative to each other to generate mechanical vibration.

This mechanical vibration is propagated to the floor plate through the main frame of the vibration generator. At this time, the vibration generator is constantly loaded in the vibration output direction, that is, the floor plate direction, through the elastic member by the heavy object having a mass exceeding the suction and repulsion generated by the voice coil. The vibration output part of the body is in a state of being strongly pressed against the floor plate, and most of the vibration energy generated by the vibration generator is propagated to the floor plate. Therefore, the floorboard generates a bass audio reproduction sound in response to the propagated mechanical vibration.

[0018]

EXAMPLES Examples will be described with reference to the drawings. FIG. 1 is a sectional front view showing an example of an acoustic device using the vibration generator of the present invention, and FIG. 2 is a sectional side view thereof. FIG. 3 is a perspective view showing the plate damper and the yoke, and FIG. 4 is a side view showing the damper receiving fitting.

In the figure, reference numeral 1 denotes a main frame, which is made of a metal material such as iron and aluminum and is formed to be long in the lateral direction. A voice coil 2 is arranged in the central portion of the main frame 1 as shown in FIGS.
The voice coil 2 has a bobbin-less structure to improve the efficiency and size of the magnetic circuit.

The insulating substrate 3 of the voice coil 2 is attached integrally by fitting a part thereof to the inner wall surface of one end of the voice coil 2. The insulating substrate 3 is attached to the coil base plate 4. At this time, the signal input terminal 5 provided on the insulating substrate 3 is inserted from the lower side of the hole (not shown) formed in the coil base plate 4, and
Project to the upper surface side. A lead wire for transmitting an audio signal in the low frequency range is soldered to the signal input terminal 5 and applied to the voice coil 2 through the signal input terminal 5.

The coil base plate 4 is provided with elongated holes (not shown) for adjusting mounting positions at its four corners, and screws 6 are passed through these elongated holes to attach the mounting pieces 7 provided on the main frame 1.
It is tightened and fixed to.

Next, the yoke 9 provided with the magnet 8 will be described. The yoke 9 is formed of a columnar member having a concave cross section, and the magnet 8 is fixed to the inner center of the yoke 9 in a loosely fitted state. Therefore, a magnetic annular gap is formed between the outer periphery of the magnet 8 and the inner wall surface of the columnar member having a concave cross section to form a magnetic circuit. The voice coil 2 is arranged in the gap. Then, the yoke 9 is fixed to the central portion of the plate damper 10 with a screw 11 so that the voice coil 2 can be always arranged in the correct position in the gap.

The plate damper 10 has a rectangular cross section in order to prevent twisting in the non-excited direction, and is a sufficiently thick plate-like elastic material made of metal such as iron, aluminum, brass and stainless steel. Is formed by. The plate damper 10 thus formed is positioned so as to be horizontal with respect to the voice coil 2, and is arranged apart from the inner wall surface of the main frame 1.

Next, an example of the support structure of the plate damper 10 described above will be described. First, the plate damper 10
Is swingably supported by a pair of damper receiving metal fittings 12 attached to the main frame 1 with both ends thereof being sandwiched. This pair of damper brackets 12
Is made of a strong elastic material such as stainless steel or phosphor bronze so as to absorb the expansion and contraction of the plate damper 10 by following the expansion and contraction caused by the swinging of the plate damper 10 in the vibration direction.

The above support structure is composed of the following parts. That is, as shown in FIG. 3, protrusions 10A are formed on both ends of the supported plate damper 10. On the other hand, the damper receiving metal member 12 is formed by bending the support portion 12A into a dogleg shape as shown in FIG. 4, and a square hole 12B is formed in the bent portion of the support portion 12A.
Is provided. Further, a screw hole 12C for attaching to a metal fitting attaching portion 1A provided on the main frame 1 is provided at the lower end portion.
Is provided.

Therefore, the plate damper 10 is separated from the inner wall surface of the main frame 1 and the voice coil 2 is provided.
In the case where the plate damper 10 is mounted horizontally, the projections 10A formed at both ends of the plate damper 10 are respectively inserted into the holes 12B of the pair of damper receiving fittings 12, and the main frame 1 is sandwiched from both sides. It is attached and supported by screwing. Further, the damper receiving metal fitting 12 prevents the protrusion 10A from swinging in the non-exciting direction, that is, the plate damper 10 from swinging in the non-exciting direction, by the vertical inner wall surface portion of the hole 12B. ing.

In the vibration generator having the support structure configured as described above, when a low frequency range audio signal of 150 Hz or less is applied to the voice coil 2, a magnetic force is applied to the voice coil 2 based on the applied audio signal. Occur. Due to the magnetic interference between the magnetic force of the voice coil 2 and the magnetic force of the magnet 8, the yoke 9 supported by the plate damper 10 and the voice coil 2 attached to the main frame 1 are relatively displaced and mechanical Generate dynamic vibration. This mechanical vibration is propagated to the entire main frame 1, and the vibration can be output to both sides of the main frame 1 positioned in the vibration direction, that is, the vertical direction.

At this time, since the plate damper 10 is swingably supported by the pair of damper receiving metal fittings 12 with both ends thereof being sandwiched, the vibration direction of both ends of the plate damper 10 is considered. It is possible to absorb the expansion and contraction by following the expansion and contraction motion caused by the rocking to.

As shown in FIGS. 1 and 2, the floor plate 1 is attached to the main frame 1 of the vibration generator constructed as described above.
Vibration output unit 1 that contacts the surface of 3 and outputs mechanical vibration
4 are integrally formed.

A vibration transmitting member (not shown) made of rubber, foamed resin or the like is attached to the lower surface of the vibration output portion 14 so as to absorb the unevenness or the like on the surface of the floor plate 13, or the tip end thereof is By attaching three legs (not shown) having sharpness and rigidity to increase the degree of close contact with the floor plate 13, the vibration transmission efficiency from the vibration output unit 14 to the floor plate 13 can be improved.

Further, in the vibration generator constructed as described above, the heavy object 15 having a mass exceeding the suction and repulsive force generated by the voice coil 2 is passed through the elastic member 16 made of rubber, foamed resin or the like. It has been placed. This heavy object 15
Is formed of lead, iron, or the like, and is arranged so as to load toward the vibration output portion 14 of the vibration generator, that is, toward the floor plate 13.

Therefore, the vibration generator is shown in FIGS.
As shown in FIG. 4, when placed on the floor plate 13, the load of the heavy object 15 causes the vibration output portion 14 of the vibration generator to be in a pressure contact state in which it is strongly pressed against the surface of the floor plate 13, and the vibration generator and the floor plate 13 are in contact with each other. The bond of is made stronger.

Further, when the low frequency range audio signal is applied in the state where the vibration generator is placed on the floor plate 13 as described above, the vibration generator generates mechanical vibration, and the floor plate 13 is transmitted through the vibration output section 14 of the main frame 1. Propagate to. At this time, the heavy object 15 has a mass larger than the suction and repulsion force of the voice coil 2, and is placed on the vibration generator via the elastic member 16, and the elastic member 16 expands and contracts according to the vibration. Because of the operation, vibration is not transmitted to the heavy object 15, and the heavy object 15 becomes almost stationary due to the action of inertia.

Therefore, also with respect to the reaction with the floor plate 13, since the heavy object 15 has a mass larger than the attraction force and the repulsion force of the voice coil 2, the vibration generator is pressed and the contact with the floor plate 13 is maintained. It

As a method of arranging the heavy object 15, any arrangement may be adopted as long as a load exceeding the suction and repulsive force generated by the voice coil 2 of the vibration generator is applied to the vibration output portion. For example, as in the embodiment shown in FIG. 1, it is arranged so as to wrap around the periphery of the vibration generator except the vibration output portion, or placed on the upper surface of the vibration generator,
Even if the heavy object is divided into a plurality of parts and arranged, the same effect can be obtained. In addition, 17 is an exterior case.

[0036]

As described above, according to the vibration generator of the present invention, since the heavy object having the mass exceeding the suction and repulsive force generated by the voice coil is provided, the vibration generator and its mechanical vibration are prevented. It is possible to strengthen the propagation of chairs, floors and other objects that come into contact with the human body without screwing or the like, and it is possible to significantly improve the vibration propagation efficiency.

Further, according to the acoustic device using the vibration generator of the present invention described above, for example, an audio signal in a low region of 70 Hz or less is converted into mechanical vibration, and this mechanical vibration is propagated to the floorboard. , From the floorboard, generate a low tone,
It is possible to make up for the listener with a rich sense of realism by compensating for the low frequency range where the speaker playback sound is insufficient. Furthermore, when the bass is generated from the floorboard, the floorboard is vibrating, so in addition to the playback sound, vibration in a state synchronized with the playback can be felt, for example, through the soles of the feet, etc. Can be further increased.

Further, since this acoustic device can be manufactured in a remarkably small size, it only needs to be connected to the signal input cord and placed on the floor at the time of use, the installation is easy, and the installation place can be freely selected. Furthermore, it is easy to remove and move when not in use.

[Brief description of drawings]

FIG. 1 is a sectional front view showing an overall configuration of an acoustic device using a vibration generator of the present invention.

FIG. 2 is a cross-sectional side view showing the overall configuration of the audio device shown in FIG.

FIG. 3 is a perspective view showing a yoke and a plate damper used in the vibration generator of the present invention.

FIG. 4 is a side view of a damper receiving metal fitting used in the vibration generator of the present invention.

[Explanation of symbols]

1 is a mainframe. 2 is a voice coil.
3 is an insulating substrate. 4 is a coil base plate. Reference numeral 5 is a signal input terminal. 6 is a screw. 7 is a mounting piece. 8 is a magnet. 9 is a yoke. 10 is a plate damper. 11 is a screw. Reference numeral 12 is a damper bracket. 13 is a floor board. Reference numeral 14 is a vibration output unit. 15 is a heavy object. Reference numeral 16 is an elastic member. 17
Is an outer case.

Claims (4)

[Claims] 1. A magnetic gap is formed by a yoke having a magnetic pole, a voice coil is arranged in the gap, and a magnetic force and a magnetic pole generated in the voice coil in accordance with an audio signal applied to the voice coil. In the vibration generator configured to generate a mechanical vibration due to the magnetic interference effect generated between the vibration generator and the magnetic force of the A structure of a vibration generator, wherein the structure is provided via a member. 2. The structure of the vibration generator according to claim 1, wherein the heavy object is arranged so as to be loaded in the vibration output direction of the vibration generator. 3. A magnetic air gap is formed by a yoke having magnetic poles, a voice coil is arranged in the air gap, and a magnetic force generated in the voice coil with a bass audio signal applied to the voice coil. And a magnetic force of a magnetic pole, the mechanical vibration is generated by a magnetic interference action, and the mechanical vibration is propagated to the floor plate. Suction generated by the coil, a heavy object with a mass exceeding the repulsive force,
An acoustic device comprising: an elastic member interposed between the vibration generator and the heavy object, and configured to generate a low-pitched audio reproduction sound from a floorboard. 4. The acoustic device according to claim 3, wherein the vibration output portion of the vibration generator is provided with at least three legs having sharp edges and rigidity.