JPH0145198Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is designed to synchronize with sound using a low-frequency audio signal in order to make deep bass sounds felt through the vibration of the eardrum and bodily sensation. , relates to an electro-mechanical vibration converter used in a device that generates mechanical vibrations without sound.

(Prior art) When listening to music, etc., if the frequency of the sound emitted from a live musical instrument or the sound reproduced from an audio device is low, around 150 Hz or less, the sound vibrates the eardrum. Rather than being confirmed by the viewer, the air vibrations become more and more felt in the body as sound pressure. The extremely low part of the audible frequency, that is, deep bass, is a sound pressure that is felt as air vibrations in parts other than the eardrum, that is, on the skin and body, and when the vibrations felt by the body and the hearing overlap, People will experience true deep bass.

Therefore, in order to make it possible to ideally experience heavy bass in sound reproduction devices, we have attempted to generate bodily-sensible vibrations that can be felt by the body, based on electrical signals that drive speakers, etc. is being done. In this case, the electro-mechanical vibration generator that generates bodily vibrations forms a magnetic space using a yoke and a pole piece with magnetic poles, and a coil wound around a coil frame is placed within this magnetic space. , the vibration is obtained by the magnetic interference effect that occurs between the magnetic force generated in the coil due to the electric signal from the sound source and the magnetic force of the magnetic pole, and the yoke and pole piece equipped with the magnetic pole and the coil are The yoke and the pole piece are supported via a damper so as to be relatively displaced.

Here, a conventionally used electro-mechanical vibration converter will be explained using FIGS. 9 and 10. 20 is a permanent magnet with an annular shape (for example, the outer diameter is 60 mm and the inner diameter is
32 mm, thickness 6 mm), and the yoke is 21 mm.
Together with this, a magnetic circuit structure 23 having a magnetic air 22 is formed. The inner circumference of a damper 24 is integrated with the outer circumference of the magnetic circuit component 23 by adhesive, and is housed in a case 25 having an opening on one side. In this way, the damper 24 is provided inside the case 25 and supports the magnetic circuit component 23 with respect to the case 25 so as to be able to freely vibrate.

As will be described later, the case 25 transmits the vibration directly to the outside, causing the back rest of a human body support such as a chair containing this electro-mechanical vibration converter to vibrate. The opening of the case 25 is covered with a cover (not shown), and a coil to which an audio current is applied is attached to this cover, and this coil is positioned within the magnetic space 3.

The damper 24 has a circular shape as shown in FIG. 9, and is made of an elastic metal plate. This damper 24 is provided with two slits 24d and 24e at different positions, thereby defining three parts 24a, 24b and 24c. 24a and 2 of these three parts
4b is a glue portion, and 24c is a spring portion.
Adhesive is applied to the adhesive portions 24a and 24b,
The adhesive margin 24a on the inner circumferential side is joined to the permanent magnet 20, and the adhesive margin 24b on the outer circumferential side is joined to the stepped portion 27 formed on the case 25, respectively. Due to this structure, although the damper 24 has a large external dimension, only the spring portion 24c sandwiched between the slits 24d and 24e performs the spring action inherent to the damper.

(Problems to be Solved by the Invention) Due to the above-described structure, conventional electro-mechanical vibration transducers have limitations in reducing their external dimensions, especially their diameter dimensions. As described above, this type of electro-mechanical vibration converter is used by being stored inside an object placed on a human body such as a chair, so it is preferable that the external dimensions be as small as possible. If the external dimensions are large, the cushion material will come into contact with the body of the viewer seated on a chair or the like, giving a sense of discomfort and even discomfort. In order to reduce the external dimensions, the permanent magnet inside the electro-mechanical vibration converter can be made smaller, but this naturally reduces the output and the conversion efficiency. Therefore, it can be said that the ideal solution is to keep the external dimensions of the permanent magnet as small as possible while maintaining a constant value.

The present invention was developed with the aim of meeting such demands.

(Means for Solving the Problems) In the present invention, as a means for solving the above problems, an annular damper 4 is installed on the inner periphery of the case 1, which is formed into a circular dish shape by attaching the lower lid 13. The permanent magnet 9 and the yoke 8 support the outer periphery of a magnetic circuit structure forming a magnetic air 11, and a coil 15 is provided in the magnetic air 11 to vibrate the magnetic circuit structure when energized. , in the electro-mechanical vibration converter attached to the top cover 12 covering the upper part of the case 1, the outer dimensions of the damper 4 are set smaller than the inner diameter of the case 1, and the inner circumference of the case 1 is A plurality of protrusions 3 are provided radially at a portion toward the outer periphery of the damper 4, and a plurality of mounting members are provided at positions shifted on the circumference from the protrusions 3 on the inner periphery of the case 1. 6 are provided radially, and the outer periphery of the damper 4 is connected to the projection 3.
In addition, the inner periphery is supported by the mounting member 6, and an annular ring 5 is attached to the inner end of the mounting member 6,
The inner circumference of the ring 5 supports the outer circumference of the magnetic circuit structure.

(Function) With this configuration, the damper 4
Since the radial width of the magnet can be narrowed, the size can be reduced by that much, and even when using the permanent magnet 9 of exactly the same size as that used in the prior art described above, the electric-mechanical The overall diameter of the vibration transducer can be significantly reduced.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. In FIGS. 1 to 3, 1 is a case of an electro-mechanical vibration converter. This case 1 is
It is shaped like a circular dish with an opening on one side (the upper part in FIGS. 2 and 3). An annular flange 2 is integrally provided on the outer periphery of the opening of the case 1. Three protrusions 3 are radially provided at equal intervals on the inner circumference of the case 1 at a portion located on the outer circumference of a damper 4, which will be described later. This protrusion 3 is provided with a damper 4 having an annular shape and having an outer diameter smaller than the inner diameter of the case 1.
are attached at several locations on the circumference in the portion corresponding to the projection 3. By being attached to the protrusions 3 in this manner, the damper 4 is not attached to the case 1 and therefore maintains a free state with respect to the case 1, so that it does not bend between the protrusions 3. It will be possible.

A plurality of mounting members 6 are provided on the inner circumference of the case 1 at a position shifted from the protrusion 3 on the circumference.
are arranged radially. The damper 4 has its outer circumference supported by the protrusion 3 and its inner circumference supported by the mounting member 6. Further, an annular ring 5 is attached to the inner end of the mounting member 6, and the outer circumference of a magnetic circuit structure, which will be described later, is formed by a yoke 8, a permanent magnet 9, and a pole piece 10. is supported. Figures 2 and 3
As shown in the figure, a shoulder portion 7 is formed on the inside of the ring 5, so that the ring 5 can be sat comfortably on the yoke 8.

In this way, the damper 4 has its outer and inner circumferences supported by the protrusions 3 and the mounting member 6 which are shifted in position on the circumference, and the inner circumference is held down by the ring 5, so that the part between them is It functions as a damper, and does not require increasing the outer diameter and providing a slit in between, as in the conventional ones shown in Figures 9 and 10. This means that a sufficient damper effect can be obtained.

In the above configuration, the protrusion 3 may be molded integrally with the case 1, or may be molded separately and then attached integrally. Also, the mounting member 6 is also attached to the ring 5.
It may be molded integrally with it, or it may be molded separately and then attached integrally. In addition, case body 1, protrusion 3, damper 4, ring 5, mounting member 6
may be integrally molded from synthetic resin. Further, in this embodiment, the damper 4 and the ring 5 are each supported at three points, but the present invention is not limited to this.

The shoulder 7 is formed on the inside of the ring 5 as described above, and when the ring 5 is fitted onto the outer circumference of the cup-shaped yoke 8, the shoulder 8a of the yoke 8 is properly aligned. It acts to sit on the seat. Inside the cup-shaped yoke 8 is a cylindrical permanent magnet 9 that serves as a magnetic pole.
is installed. A disc-shaped pole piece 10 is attached to the permanent magnet 9, and a magnetic space 11 is formed between the annular edge 8b of the yoke 8 and the pole piece 10. The yoke 8, the permanent magnet 9, and the pole piece 10 constitute a magnetic circuit structure as described above. The openings of the case body 1 are each closed by an upper lid 12 and a lower lid 13, and an annular coil frame 14 is attached to the upper lid 12, and the coil 1 wound around the coil frame 14 is attached to the upper lid 12.
5 is placed in the magnetic space 11.

This electro-mechanical vibration converter constructed in this manner is used by attaching the case 1 to a diaphragm built into a chair, cushion, or the like.
After the coil 15 is installed in this way, when an electric signal that drives the speaker of the sound source is passed through the low-pass filter and energized, the damper 4 is caused by the magnetic interference between the magnetic force generated in the coil 15 and the magnetic force of the permanent magnet 9. The magnetic circuit component supported through the case 1 and the case 1 are displaced relative to each other, generating vibrations that can be felt by the body and synchronized with the sound from the speaker.This vibration is transmitted to the diaphragm through the case 1. Reportedly.

In this case, the body-sensible vibrations that occur are generated based on electrical signals from the sound source, so they are synchronized with the sounds heard by the ears, and because they are based on electrical signals in the bass range, they do not produce deep bass sounds. It is effective as a vibration when feeling. The cutoff frequency of the low frequency filter varies depending on the sound source, but it is best to have a cutoff frequency of around 150Hz. In the present invention, the entire peripheral edge of the damper 4 is not directly attached to the case 1, but the edge 4a is free from the case 1 and is attached to the case 1 by several protrusions 3. , the damper 4 is bent at a portion between the protrusions 3 with the portion attached to the protrusion 3 as a fixed point, causing a relative displacement between the magnetic circuit component and the case 1.

(Effect of the invention) As explained above, in the present invention, when installing the damper to the case, the edges of the damper are installed in a free state from the case, so multiple dampers can be installed radially to the case. Therefore, unlike the conventional damper shown in FIGS. 9 and 10, there is no need to provide a circumferential slit in the damper itself, and the radial width of the damper is narrowed. be able to. Therefore, the conventional damper requires a large area, which is improved, and the entire electro-mechanical vibration converter can be downsized.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a case in an embodiment of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1,
Figure 3 is a sectional view taken along the - line in Figure 1, Figure 4 is a sectional view taken along the - line in Figure 1, and Figure 5 is a sectional view taken along the - line in Figure 1.
6 is a plan view of the electro-mechanical vibration converter according to the present invention, and FIG.
8 is a sectional view taken along the - line in FIG. 6, FIG. 9 is a plan view of a conventional electro-mechanical vibration converter, and FIG. FIG. 1...Case, 3...Protrusion, 4...Damper,
5...Ring, 8...Yoke, 9...Permanent magnet,
10...Pole piece, 11...Magnetic sky, 1
2...upper lid, 13...lower lid, 15...coil.

Claims (1)

[Scope of utility model registration request] The outer periphery of a magnetic circuit structure, which has a permanent magnet and a yoke forming a magnetic air space, is supported on the inner periphery of the case, which is formed into a circular dish shape with a lower lid attached, via an annular damper. In an electro-mechanical vibration converter, in which a coil that vibrates the magnetic circuit component when energized is attached to a top lid covering the top of the case, the outer dimensions of the damper are set to the inner diameter of the case. Set smaller than the dimensions,
A plurality of protrusions are provided radially in a portion of the inner circumference of the case toward the outer circumference of the damper, and
A plurality of mounting members are provided radially at positions circumferentially shifted from the projections on the inner peripheral portion of the case, and the outer periphery of the damper is supported by the projections and the inner periphery is supported by the mounting members. An electro-mechanical vibration converter, characterized in that an annular ring is attached to an inner end of the mounting member, and an outer circumference of the magnetic circuit structure is supported on an inner circumference of the ring.