JPH0134465Y2 - - Google Patents

Description

[Detailed description of the invention] This invention generates bodily sensation vibrations using electric signals in the low frequency range, and unlike speakers that emit sound waves into the space at a considerable volume, this invention is mainly used in chair backrests and buttocks. It is a type of speaker that directly affects the human body by vibrating a highly rigid member (this is called a board). Specifically, it is a type of speaker that is connected integrally from one of a pair of plates located on the opposite pole sides of a ring-shaped magnet. A magnetic gap is formed between the outer circumferential surface of the cylindrical center pole and the other plate, and a vibration member equipped with a voice coil bobbin located within the gap is inserted through a damper on the opposite side of each of the plates from the magnet. The present invention relates to a board driving unit supported by a fixed member.

The board driving unit with the above configuration uses a double damper to compensate for the unbalance of force when the vibrating member and voice coil bobbin move forward and backward at large amplitudes, suppress their fluctuation, and improve vibration characteristics. The conventional driving unit of this type has a magnet 01 and a pair of plates 02 and 03 located on both pole sides thereof, as shown in FIG.
The plates 02 and 03 of this assembly and the vibration member 07 equipped with the voice coil bobbin 06 are brought into surface contact in the same plane with the fixed members 010 and 011 that support the double dampers 08 and 09. However, in such conventional driving units, the overall assembly method is as follows: ○B. The above-mentioned assemblies 01, 02, 03 and the above-mentioned fixing members 010, 011 are attached to the plate 0.
After performing so-called centering, in which the voice coil 06 is positioned concentrically within the magnetic gap 05 by relatively moving within the abutment surface using the outer diameters of the plates 02 and 03 as a reference, it is fixed to the plates 02 and 03. As shown in FIG. A voice coil holder having a stepped portion 012A formed on its inner circumferential surface to tightly fit inside the voice coil bobbin 06 to hold the bobbin 06, and to fit externally to the cylindrical center pole 04 of one plate 02 by a specified depth. 012 for centering and adhesive fixation, and the other fixing member 011 is also attached to the assembly 01, 0.
2 and 03, and after each adhesive surface has dried, the voice coil holder 012 is removed and the vibration member 07 is attached to the voice coil bobbin 0.
I had no choice but to adopt one of the following methods: 6.

Therefore, in the case of the former assembly method (○A), if the diameter of the center hole of plate 03 (reamer diameter) and its outer diameter are not formed completely concentrically, the prescribed centering cannot be performed. Problems tend to occur in assembly accuracy, and in order to improve assembly accuracy, extremely high precision is required in the manufacture of the plate, which poses a problem that causes a rise in product costs. In addition, if the latter assembly method is used, it not only requires specialized assembly jigs such as the voice coil holder mentioned above, but also requires many assembly steps, which increases the cost of assembly and increases the product cost. There's a problem.
All of these assembly problems are due to the conventional structure in which the plate and fixing member are bonded and fixed in surface contact, and because they are bonded on a flat surface, they are susceptible to strong vibrations and changes in environmental conditions such as temperature. If the unit is used in a place where there is a lot of heat, the adhesive force will decrease and deteriorate quickly, and there is a strong possibility that this will cause relative displacement between the plate and the fixing member, which will significantly impede the intended performance of the unit. It was hot.

In view of these circumstances, the purpose of the present invention is to provide a high-precision, low-cost board driving unit by solving the assembly problems of the conventional structure described above through extremely simple structural improvements. have

In order to achieve the above object, the board driving unit according to the present invention is provided with an annular protrusion toward the fixing member side, which is concentric with the center hole of each plate, at a position near the outer periphery of each of the plates. At the same time, the fixing member has a structure in which a folded peripheral wall part that fits into the annular protrusion is integrally formed on the outer periphery of the fixing member. It is as follows.

In other words, the present invention does not involve adhesively fixing the plate and the fixing member by bringing them into surface contact in one plane, but by forming an annular protrusion on the plate side concentrically with the center hole of the plate and fixing the fixing member. Since both the plate and the fixing member are centered and fixed by the fitting action with the folded peripheral wall integrally formed on the member side, the annular protrusion is punched out at the same time as the center hole of the plate is machined. In light of the fact that it is very easy to form both reliably and accurately concentrically using current machining technology, the plate and fixing member can be easily formed without using a dedicated jig such as the voice coil holder mentioned above. can be centered in a predetermined manner with an extremely simple operation such as simple fitting and a minimum number of assembly steps, and assembly accuracy can be significantly improved. Therefore, the manufacturing accuracy of the plate can be relatively low, and together with the reduction in assembly time and cost, the product cost can also be reduced. In addition, as mentioned above, since they are fixed in the fitted state, there is no need to use a particularly strong adhesive, and in some cases, it can be used as a means of fixing the plate and the fixing member instead of adhesion, which requires a drying process. It is also possible to employ screw fastening means, which has the advantage of making assembly easier and more efficient.

Embodiments of the present invention will be described in detail below based on the drawings.

In FIGS. 1 and 2, 1 is a ring-shaped magnet, and a pair of plates 2 and 3 are provided on both S and N pole sides of the magnet, extending from the center of one plate 2 to the center hole of the other plate 3. A magnetic gap 5 is formed between the outer circumferential surface of the cylindrical center pole 4 which is integrally connected to the 3A side and the inner circumferential surface of the center hole 3A of the other plate 3. An external magnetic circuit is formed with the direction of the lines of magnetic force shown. Reference numeral 6 denotes a voice coil bobbin having a voice coil 6A wound around its outer circumferential surface, and this bobbin 6 is a damper supporting fixing member fixed to the surface of each of the plates 2 and 3 on the side opposite to the magnet 1. 10 and 11 via dampers 8 and 9, and is fixed to a vibrating member 7 which is supported and connected so as to vibrate, and is held concentrically within the gap 5 when the whole is assembled in the state shown in FIG. 2. It is. The vibrating member 7 is a board B
The voice coil bobbin 6 is composed of a perforated disk-shaped member 7B having a flat surface for attachment and a flanged cylindrical member 7A coaxially inserted into the center hole 2A of the center pole 4. is fixed to.

In the board driving unit having the basic configuration as described above, the fixing is performed at positions near the outer periphery of both plates 2 and 3 by press punching and simultaneous machining of the center holes 2A and 3A of each of the plates 2 and 3, respectively. Annular protrusions 2B and 3B are formed on the members 10 and 11 side by concentric stamping, and a folded peripheral wall part 10B that fits into the annular protrusions 2B and 3B on the outer periphery of the fixing members 10 and 11,
11B is integrally formed by press working.

Next, to briefly explain the assembly procedure, as shown in FIG. 1, two damper side members 7 are assembled separately from the magnetic circuit side components 1, 2, and 3.
A, 8, 10 and 7B, 9, 11 are fitted with folded peripheral wall portions 10B, 11B formed on the fixing members 10, 11 using annular protrusions 2B, 3B formed on the plates 2, 3 as guides. By moving the voice coil bobbin 6 relative to the gap 5 of the magnetic circuit, the voice coil bobbin 6 is centered with respect to the gap 5 of the magnetic circuit.
They are then glued and fixed to form a product as shown in Figure 2.

In addition, FIG. 3 shows another embodiment, in which a screw 1 such as a screw is used to screw the plates 2, 3 and the fixing members 10, 11 into the annular protrusions 2B, 3B.
3 and 13, which are fixed and integrated,
Compared to the above-mentioned embodiments, this embodiment has the advantage that an adhesion drying process is unnecessary and assembly efficiency can be improved.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view before assembly, Fig. 2 is a longitudinal sectional view of the assembled finished product, Fig. 3 is an enlarged longitudinal sectional view of the main part showing another embodiment, and Fig. 4 is a longitudinal sectional view of the conventional product. Figure, 5th
The figure is an enlarged vertical sectional view of the main parts showing one method of assembling a conventional product. 1... Magnet, 2, 3... Plate, 4...
...Center pole, 5...Magnetic gap, 6...
Voice coil bobbin, 7... Vibration member, 8, 9...
...Damper, 10, 11...Fixing member, 2B, 3
B...Annular protrusion, 2A, 3A...Plate center hole, 10B, 11B...Folded peripheral wall part.

Claims (1)

[Claims for Utility Model Registration] Among a pair of plates 2 and 3 located on both pole sides of the ring-shaped magnet 1, the outer peripheral surface of a cylindrical center pole 4 integrally connected to one plate 2 and the other plate 3. A magnetic gap 5 is formed between the two plates, and a vibration member 7 fitted with a voice coil bobbin 6 located within the gap 5 is inserted through dampers 8 and 9 on the opposite side of the plates 2 and 3 from the magnet 1. In the board driving unit supported by fixing members 10, 11, both the plates 2,
3, annular protrusions 2B, 3B toward the fixing members 10, 11 in a concentric state with the center holes 2A, 3A of each of the plates 2, 3.
At the same time, the fixing member 1 is stamped and formed.
1. A board driving unit characterized in that folded peripheral wall portions 10B and 11B are integrally formed on the outer peripheries of 0 and 11 to fit into the annular protrusions 2B and 3B. The board driving unit according to claim 1, wherein the annular protrusions 2B and 3B are formed by stamping at the same time as the center holes 2A and 3A of each plate 2 and 3 are formed. Both plates 2, 3 and both fixing members 10, 1
1. The board driving unit according to claim 1, wherein the means for fixing the board to the board driving unit 1 is an adhesive means. Both plates 2, 3 and both fixing members 10, 1
1. The board driving unit according to claim 1, wherein the means for fixing the unit to the board driving unit 1 is a screwing means.