JPH06133395A - Support structure for magnetic circuit member for vibration generator - Google Patents

Abstract

PURPOSE:To provide the new support structure for the magnetic circuit member for the vibration generator in which no friction sound noise is generated at a contact part between a damper and a support metallic fixture. CONSTITUTION:In the vibration generator provided with a couple of support metallic fixtures 9 to which both ends 8A, 8B of a damper 8 to which a voice coil 2 or a yoke 5 is fitted are inserted to support the ends 8A, 8B in a rocking available way, a film 11 is inserted to a contact between the damper 8 and the support metallic fixture 9 and supported.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention converts an audio signal for driving a speaker, for example, a low-pitched audio signal of 150 Hz or less into a mechanical vibration and makes it felt in synchronization with reproduction of the speaker. A vibration generator that generates mechanical vibration of a wall, window glass,
The present invention relates to a vibration generator for propagating mechanical vibration to a vibration member such as a floor to reproduce an audio signal, and more particularly to a support structure for a magnetic circuit member in the vibration generator.

[0002]

2. Description of the Related Art Conventionally, in a vibration generator of this type, a yoke having a magnetic pole is used to form a magnetic gap, and a voice coil is arranged in this gap so that the low-frequency range applied to the voice coil is reduced. It has been proposed to obtain mechanical vibration by a magnetic interference action generated between a magnetic force generated in a voice coil and a magnetic force of a magnetic pole due to an audio signal.

As one means for propagating (outputting) the mechanical vibration of this vibration generator to a diaphragm or the like, a yoke is supported in a case body through a damper so that the yoke and the case body are displaced relative to each other. In addition to the above structure, the case body is attached to a diaphragm or the like as a mounting member to output mechanical vibration. (For example, Japanese Patent Publication Sho 58-
(See Japanese Patent No. 9640)

In such a vibration generator, which has a structure for outputting mechanical vibration through the case body, it is necessary to support the yoke in the case body so that the yoke can be swung in the vibration direction. As a supporting means for this yoke, for example, there is a structure in which it is supported by a ring-shaped damper that is positioned horizontally with respect to the voice coil within a plane including a void where the voice coil is located. (For example,
(See Japanese Patent Publication No. 58-9640)

However, in the vibration generator having the support structure as described above, when the vibration is generated, the voice coil and the magnetic circuit member, which are constantly displaced in the exciting direction, are displaced relative to the non-exciting direction. That is, kinking occurs,
There is a drawback that the voice coil and the yoke of the magnetic circuit member come into contact with each other to generate abnormal noise. In particular, unlike a general speaker that vibrates a lightweight voice coil, a structure in which a heavy yoke vibrates causes a serious problem.

In order to solve such inconvenience, the applicant of the present invention has previously filed Japanese Patent Application Nos. 3-128296, 3-216507, and 4-72224.
We have proposed a new vibration generator. This vibration generator is configured as follows.

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 accompanying an audio signal applied to the voice coil and the magnetic pole In a vibration generator configured to obtain a mechanical vibration by a magnetic interference action generated with a magnetic force, both ends of an elastic damper having an elongated flat plate shape having a yoke attached to a central part are provided with spring-like support metal fittings. It is configured so as to be slidably supported so as to be swingable, and to follow the expansion and contraction operation caused by the swinging of both ends of the damper in the vibration direction and absorb the expansion and contraction.

[0008]

SUMMARY OF THE INVENTION Like the above-mentioned vibration generator previously proposed by the applicant of the present invention, a structure in which both ends of a damper are supported by being sandwiched by supporting metal fittings having a spring property is as follows. The structure is extremely simple and the exercise efficiency is remarkably good. However, there is a possibility that rubbing noise may be generated at the contact portion between the damper and the support fitting, and it is necessary to improve the noise.

The present invention provides a novel magnetic circuit member support structure by solving the problems of the above vibration generator, and is constructed so that no frictional noise is produced at the contact portion between the damper and the support fitting. An object of the present invention is to provide a magnetic circuit member support structure for a vibration generator.

[0010]

In order to achieve the above object, a magnetic circuit member supporting structure of a vibration generator according to the present invention comprises a voice coil and a suction associated with an audio signal applied to the voice coil. It consists of a repulsive magnet, a damper to which either this magnet or voice coil is attached, and a spring-like support metal fitting that supports both ends of this damper so that it can oscillate. The film is sandwiched and supported by the contact portion.

Further, at the contact portion between the damper and the support fitting, a curved portion is provided on one of the contact portions so that the contact portions are gradually separated from each other.

[0012]

When a low-pitched 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 a magnetic interference action is generated between the voice coil and the magnetic force of the magnetic pole. The yoke attached to the elastic damper having a long and narrow flat shape and the frame to which the voice coil is attached are relatively displaced to generate mechanical vibration. At this time, the damper slightly bends in the vibration direction from the horizontal state due to the vibrational movement of the yoke, then returns to the horizontal state again, and subsequently performs a series of vibrational movements that slightly bends to the opposite side. Along with this vibration operation of the damper, both end portions of the damper, that is, the portions acting as fulcrums, perform an expanding / contracting operation in which a small amount of horizontal movement is repeated while swinging. At this time, since both ends of the damper are supported by spring-supporting metal fittings so that they are sandwiched from both sides, the supporting metal fittings can be expanded and contracted due to the swinging of the both ends in the vibration direction. Follow up and absorb the expansion and contraction.

Further, the film sandwiched in the contact portion between the damper and the support fitting fills the gaps in the contact portion and makes it difficult to produce a rubbing sound at the contact portion. This film breaks and penetrates with the passage of time, but at the contact portion between the damper and the support fitting, a curved portion is provided on one of them, and the contact portion is configured to be gradually separated. The breakage and penetration of the film occur only at the tip of the curved portion and do not proceed any further. Therefore, the film intervenes in the portion other than the leading edge, and almost no rubbing noise is generated.

[0014]

EXAMPLES Examples will be described with reference to the drawings. FIG. 1 is a partially cutaway perspective view of a vibration generating device implementing a magnetic circuit member supporting structure according to the present invention, and FIG. 2 is a sectional view of FIG. 3 is an enlarged cross-sectional view of an essential part of the left side portion of FIG. 2, and FIG. 4 is a cross-sectional plan view of the essential part showing the relationship between the damper, the support fitting, and the film in the left side portion of FIG. 5 is a front view of the film, and FIG. 6 is a sectional view of the film.

In the figure, reference numeral 1 is a frame having a U-shaped cross section, which is made of metal such as aluminum and is elongated in the lateral direction. A voice coil 2 is arranged inward at the center of the frame 1, and the voice coil 2 is fixed to an insulating substrate 3. The insulating substrate 3 is attached to the fixed plate 4. By adjusting the mounting position of the fixing plate 4 with respect to the frame 1, the voice coil 2 can be correctly arranged in the magnetic gap of the yoke 5. Reference numeral 6 is a terminal to which the voice coil 2 is connected, and an audio signal in a low range is applied to the terminal 6 and supplied to the voice coil 2.

Next, the yoke 5 provided with the magnet 7 will be described. As shown in FIG. 2, the yoke 5 is formed of a columnar member having a concave cross section, and the magnet 7 is fixed in a loosely fitted state at the center position of the inside thereof. Therefore, this magnet 7
A magnetic annular gap is formed between the inner wall surface of the cylindrical member having a concave cross section and a magnetic circuit. Then, the voice coil 2 is arranged in the void.
Further, the yoke 5 is fixed to the central portion of the damper 8 so that the voice coil 2 can be always arranged in the correct position in the gap.

The damper 8 has a rectangular cross-section to prevent twisting in the non-excited direction, and is a plate-like elastic material made of metal such as elongated flat plate aluminum, brass or stainless steel having a sufficient thickness. Has been formed. The damper 8 is positioned so as to be horizontal with respect to the voice coil 2, and both end portions 8A and 8B thereof are arranged and supported apart from the inner wall surface of the frame 1.

Next, the support structure of the damper 8 described above will be described. First, the damper 8 is swingably supported in a state where both ends 8A and 8B thereof are clamped by a pair of support fittings 9 attached to the frame 1. The pair of support fittings 9 are made of a spring material such as stainless steel or bronze so as to absorb the expansion and contraction by following the expansion and contraction operation caused by the swinging of both ends 8A and 8B of the damper 8 in the vibration direction. It is composed of a strong elastic material.

The above support structure is composed of the following parts. That is, the protrusions 10 are formed on both ends 8A and 8B of the damper 8, respectively. On the other hand, the support fitting 9 is formed by bending the support portion 9A into a dogleg shape, and a square hole 9 is formed in the bent portion of the support portion 9A.
B is provided. Furthermore, the lower end 9C of the support fitting 9
Is formed so that it can be screwed and fixed to a mounting portion 1A provided on the frame 1.

Both ends 8A and 8B of the damper 8 which come into contact with the support portion 9A of the support fitting 9 are curved as shown in FIG. 4, and the contact portions with the support portion 9A gradually go outward. It is configured to go away.

Reference numeral 11 is a film made of polyethylene or the like, and as shown in FIGS. 5 and 6, a hole 11A through which the projection 10 is inserted is formed at a substantially central portion thereof. An adhesive 12 is applied to the back surface of the film 11. Therefore, the film 11 can be attached to both ends 8A and 8B of the damper 8 in advance.

When the damper 8 constructed in this manner is attached to the frame 1 by using the support fitting 9, first, the projection 10 of the damper 8 is inserted into the support portion 9A, and then the lower end of the support fitting 9 is inserted. The portion 9C is fixed to the frame 1 with screws. At this time, the film 11 has the end portion 8A of the damper 8
(And 8B) and the support portion 9A, that is, the contact portion. Therefore, the damper 8 has two end portions 8A, 8
The support fitting 9 arranged at B separates from the inner wall surface of the frame 1 while being strongly held from both sides, and is supported horizontally with respect to the voice coil 2. On the other hand, the support fitting 9
Is fixed to the frame 1 so that both end portions 8A and 8B of the damper 8 are strongly clamped, so that the support member 9 itself has a spring property, so that the damper 8 bends slightly outward and retains its force. .

In the vibration generator having the support structure configured as described above, when an audio signal in the low frequency range of 150 Hz or less is applied to the voice coil 2, the voice coil 2 is applied to the voice coil 2 based on the applied audio signal. 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 yoke 5, the yoke 5 attached to the damper 8 and the frame 1 attached to the voice coil 2 are relatively displaced to generate mechanical vibration. Occur. This mechanical vibration is propagated to the entire frame 1 and
Can be taken out (outputted) from the side surface located in the vibration direction.

At this time, the damper 8 slightly bends in the vibration direction from the horizontal state due to the vibrating operation of the yoke 5, then returns to the horizontal state again, and then a series of vibrations that slightly bend to the opposite side. exercise. Such a damper 8
Along with the oscillating movement, the both end portions 8A, 8B of the damper 8, that is, the portion acting as the fulcrum, expands and contracts by repeating a slight horizontal movement while swinging. However, since the both end portions 8A and 8B are supported by the supporting metal fittings 9 having a spring property so as to be sandwiched from both sides, the supporting metal fittings 9 extend and contract due to the swinging of the both end portions 8A and 8B. It is possible to support by performing a follow-up operation so as to absorb.

Further, by sandwiching the film 11 into the contact portion between the damper 8 and the support fitting 9, the gap between the contact portions is filled, and the rubbing noise at the contact portions is less likely to be produced. Further, this film 11 breaks and penetrates with the passage of time, but at the contact portion between the damper 8 and the support fitting 9, both ends 8A (and 8B) of the damper 8 have a structure shown in FIG.
Since the curved portion a as shown by is provided and the contact portions are formed so as to be gradually separated from each other in the outward direction, breakage and penetration of the film 11 occur only at the tip b of the curved portion a. No further outward travel. Therefore, the film 11 intervenes in a portion other than the leading edge b, and almost no rubbing noise is generated.

[0026]

As described above, in the magnetic circuit member support structure of the vibration generator according to the present invention, the gap between the contact portion is filled by inserting the film into the contact portion between the damper and the support fitting. Since it is possible to prevent the rubbing sound from being generated at the contact portion, it is possible to prevent an unnecessary sound from being generated from the vibration generating device itself and to provide a quiet structure.

Further, at the contact portion between the damper and the support fitting, a curved portion is provided on either one of the contact portions and the contact portions are gradually separated from each other. The breakage and penetration of the sandwiched film can be prevented only at the tip of the curved portion and cannot proceed any further. Therefore, it is possible to prevent the rubbing noise from being generated by interposing the film in the portion other than the leading edge.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an overall configuration of a magnetic circuit member supporting structure of a vibration generator according to the present invention.

2 is a cross-sectional view of the magnetic circuit member support structure shown in FIG.

FIG. 3 is an enlarged cross-sectional view of a main part of the left side portion of FIG.

4 is a cross-sectional plan view of relevant parts showing the positional relationship between the damper, the support fitting, and the film on the left side of FIG.

FIG. 5 is a front view of a film.

6 is a cross-sectional view of the film of FIG.

[Explanation of symbols]

1 is a frame. 2 is a voice coil. 3 is an insulating substrate. 4 is a fixed plate. 5 is a yoke.
6 is a terminal. 7 is a magnet. 8 is a damper.
8A and 8B are both ends. Reference numeral 9 is a support fitting. 10
Is a protrusion. 11 is a film. 12 is an adhesive. a is a curved part. b is the most advanced part.

Claims (2)

[Claims] 1. A voice coil, a magnet that attracts and repels with an audio signal applied to the voice coil, a damper to which one of the magnet and the voice coil is attached, and both ends of the damper. In a vibration generator equipped with a spring-like support metal fitting for sandwiching and swinging, a magnetic circuit member support of the vibration generator characterized in that a film is sandwiched in a contact portion between the damper and the support metal fitting. Construction. 2. The contact portion between the damper and the support fitting,
The magnetic circuit member support structure for the vibration generator according to claim 1, wherein a curved portion is provided on either one of the curved portions, and the contact portions are gradually separated from each other.