JPH0241996Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The invention is designed to be placed in a human body object such as a chair, and to give a bodily sensation of vibration to the listener who is seated on the chair or the like while listening to music. The present invention relates to an electro-mechanical vibration transducer, and in particular, by improving the damper and its mounting portion, it is possible to reduce the external dimensions while maintaining performance.

(Prior art) Conventionally, among the acoustic signals output by a stereo device, a sound signal with a reduction appropriate for emitting a bodily sensation is generated to generate a bodily sensation, and this vibration is transmitted to an object placed on the human body such as a chair. An electro-mechanical vibration transducer is known that provides a sense of realism to the body of a listener while listening to music. A conventional electro-mechanical vibration converter called an external magnetic type will be explained with reference to FIGS. 1 and 2. FIG. 1 is a magnet with an annular shape (for example, the outer diameter is 60 mm and the inner diameter is 32 mm)
It has a thickness of 6 mm), and together with the yoke 2 forms a magnetic circuit structure 4 having a magnetic air space 3. The inner circumference of a damper 5 is integrated with the outer circumference of the magnetic circuit structure 4 by adhesive, and is housed in a case 6 having an opening on one side. In this way, the damper 5 is provided inside the case 6 and supports the magnetic circuit component 4 with respect to the case 6 so as to be able to vibrate freely.

As will be described later, the case 6 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 6 is covered with a lid (not shown), and a coil to which an audio current is applied is attached to this lid, and this coil is connected to the magnetic air 3.
It is located inside.

The damper 5 has a circular shape as shown in FIG. 1, and is made of an elastic metal plate. This damper 5 is provided with two slits 5d and 5e at different positions, thereby defining three parts 5a, 5b and 5c. Of these three parts, 5a and 5b are glue allowance parts, and 5c is a spring part. Glue allowance parts 5a and 5
Adhesive is applied to c, and the adhesive allowance 5a on the inner circumferential side
is joined to the magnet 1, and the glue allowance 5b on the outer circumferential side is joined to the stepped part 6 formed on the case 6. Due to this structure, although the damper 5 has a large external dimension, only the spring portion 5c sandwiched between the slits 5d and 5e 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 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 maintain the external dimensions of the magnet as small as possible while maintaining a constant value.

The present invention was developed to meet such demands.

(Means for Solving the Problems) As a means for solving the above problems, the present invention provides a damper inside a case having an opening, and uses a magnet and a yoke to generate magnetic air through the damper. In an electro-mechanical vibration converter in which the formed magnetic circuit structure is housed, and a coil is disposed in the magnetic space to vibrate the magnetic circuit structure when energized, A plurality of support members are provided at intervals, a step is formed in the opening of the case, and a positioning frame for positioning the support member is engaged with the step, whereby the effective portion of the damper is The case is located above the stepped portion, and the opening of the case is covered with a lid.

(Function) With such a configuration, even when using exactly the same magnet as that used in the prior art described above, its diameter can be significantly reduced.

(Example) An example of the present invention will be described below with reference to FIGS. 3 and 4. Reference numeral 17 denotes an electro-mechanical vibration converter, and this electro-mechanical vibration converter 17 is roughly composed of a lid 18, a case 19, a magnetic circuit component 20, and a damper 21. The lid body 18 has a dish-shaped cross section and is composed of a frame body 22 and a coil body 23. The frame 22 has an opening 24 formed in its center, and its outer circumferential portion is bent at a substantially right angle, and this bent portion serves as an insertion portion 25 into the case 19.

The coil body 25 is formed by integrally molding a disc-shaped blade 26 and a cylindrical coil frame 27. The coil frame 27 is located at the center of the plate 26, and the coil 27 is wound around the outer periphery of the coil frame 27. This is what has been done. In this coil body 23, the coil frame 27 is located within the opening 24 of the frame body 22, and the plate 2
6 is attached to the frame 22 by being fixed to the frame 22 with an adhesive. Case 19
has a dish-like cross section in the height direction that is deeper than the lid body 18, and has four flange-like edges 28 formed at the peripheral edge on the opening side. Edge 28
has a screw hole and forms a mounting part for mounting on a diaphragm or the like.

A step 30 is formed inside the edge 28 on the opening side of the case 19, and a fifth step is formed in this step.
As shown in the figure and FIG. 6, four positioning frames 31 are provided at equal intervals in the circumferential direction.
The positioning frame 31 is approximately rectangular, and the damper 2
1 mounting part is formed. An annular groove 32 for attaching the lid 18 is formed between the edge 28 on the opening side of the case 19 and the stepped portion 30, and the insertion portion 25 of the lid 18 is fitted into this annular groove 32. The lid body 18 is attached to the case 19 by being fixed with an adhesive.

The magnetic circuit component 20 is displaceable relative to the case 19 to generate bodily vibrations, and the yoke 33
and an annular magnet 34. The yoke 33 consists of a bottom plate 36 having a columnar part 35 in the center and an annular top plate 37.
A magnet 34 is mounted and fixed in a state in which a columnar portion 35 is loosely fitted, and a top plate 37 is attached to the magnet 34. A magnetic annular space is formed between the inner edge 37a of the top plate 37 and the outer edge 35a of the columnar portion 35 of the bottom plate 36.
38 is formed, and the magnet 34, the bottom plate 36, and the top plate 37 constitute a magnetic circuit having an air hole 3.

A stepped portion 39 is formed by the outer edge of the top plate 11 and the outer surface of the magnet 34, and this stepped portion 39 forms a mounting portion for the damper 21. damper 21
has an inner peripheral part 21a and an outer peripheral part 21b in the circumferential direction.
An annular holding frame 40 is attached to the inner peripheral part 21a, and the inner peripheral part 21a is located at the center of the holding frame 40 in the thickness direction. Holding frame 40
The inner peripheral portion 21a to which the yoke 33 is attached is placed on the stepped portion 39 of the yoke 33 via a holding frame 40, and is fixed with an adhesive.

The outer circumferential portion 21b of the damper 21 has four grooves spaced at equal intervals in the circumferential direction, as shown in FIGS. 7 and 8.
Support members 41 are provided. This support member 41 has the same size in the radial direction and circumferential direction as the inside of the positioning frame 31 provided on the step portion 30 of the case 19 . As shown in FIG. 7, the portion of the outer peripheral portion 21b of the damper 21 where the support member 41 is provided is provided with anti-slip means to prevent the support member 41 from moving in the circumferential direction along the damper 21. The deformed portion 42 has a shape similar to that shown in FIG.

By fitting the support member 41 into the positioning frame 31 of the case 19 and fixing it with adhesive, the magnetic circuit structure 20 is attached to the case 19 so as to be relatively displaceable by the damper 21, and the support member 41
The space between the support member 41 and the other support member 41 functions as a spring portion. The axial space between the damper 21 and the stepped portion 30 and the lid body 19 and the damper 21
The axial space and the axial space form a vibration space of the magnetic circuit structure 20.

The electro-mechanical vibration converter 17 having the above configuration has a support member 41 provided on the outer circumferential portion 21b of the damper 21 provided in the magnetic circuit component 20, and this support member 41 is attached to the case 19 with adhesive. The supporting member 41 and the adjacent supporting member 41
The space between the two will function as a spring section. As a result, the effective part of the damper 21 is located above the stepped portion 30, so there is no need to provide the damper 21 with an additional radial allowance on the outside of the outer peripheral portion 21b, and as shown in FIGS. Compared to the conventional one shown, the outer diameter dimension is reduced by that amount. That is, by providing a positioning frame 31 on the stepped portion 30 of the case 19 and positioning and fixing the indicating member 41 of the damper 21 on the positioning frame 31, the inner wall in the circumferential direction of the case 19 and the outer peripheral portion 21b of the damper 21 are fixed. This eliminates the extra space between them, resulting in a corresponding reduction in size.

(Effects of the invention) As explained above, according to the invention, support members are provided at equal intervals in the circumferential direction of the damper, a support frame is provided on the stepped portion formed on the opening side of the case, and the support member is provided at equal intervals in the circumferential direction of the damper. By holding the supporting member of the damper, it is possible to miniaturize the electro-mechanical vibration converter by using magnets of exactly the same size as conventional ones, that is, without degrading the performance in the slightest compared to conventional ones. can be achieved. As an example, we will use a magnet with exactly the same dimensions as the conventional one (the one listed above), but with an outer diameter of 30 mm.
I was able to make it a little smaller. By being able to downsize, it is possible to eliminate the sense of discomfort and discomfort that the conventional ones caused to the viewer sitting on a chair or the like due to their large external dimensions.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventional example of an electro-mechanical vibration converter, Fig. 2 is a vertical sectional view of the one shown in Fig. 5 is a plan view of the case in FIG. 4, FIG. 6 is a longitudinal sectional view of the case in FIG. 5, FIG. 7 is a plan view of the magnetic circuit part in FIG. 4, Figure 8 is the 4th
It is a top view of the damper in a figure. 17...Electro-mechanical vibration converter, 19... Case,
20... Magnetic circuit structure, 21... Damper, 30...
Stepped portion, 31... Positioning frame, 40... Holding frame, 41...
Support member.

Claims (1)

[Scope of utility model registration request] A damper is provided inside a case having an opening, and a magnetic circuit structure in which a magnetic air is formed by a magnet and a yoke is installed through the damper, and the magnetic air is applied to the magnetic air by energization. In an electro-mechanical vibration transducer provided with a coil for vibrating a circuit component, a plurality of support members are provided at equal intervals in the circumferential direction of the damper, and a stepped portion is formed in the opening of the case, A positioning frame for positioning the support member is engaged with the stepped portion so that an effective portion of the damper is positioned above the stepped portion, and the opening of the case is covered with a lid. An electro-mechanical vibration transducer characterized by: