JPS5853825Y2 - Diaphragm for speaker - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a diaphragm for a speaker using a woven or nonwoven fabric such as silk or cotton as a diaphragm base material.

Conventionally, a dome-shaped diaphragm using a flexible woven fabric (silk, cotton, etc.) as the diaphragm base material has been known. agent (phenolic resin)
It has a structure in which the base fabric 1 is impregnated with the material, heated and pressurized to form a dome shape, and then a sealing agent (silicone resin, acrylic resin, etc.) 2 is applied to the surface of the base fabric 1 to perform sealing treatment.

Such a structure consists of three steps: a forming process of the base fabric 1, a sealing treatment process, and a drying process after applying the sealant 2,
Further, since the sealing process is a manual process in which the sealant 2 is applied several times with a brush or the like, workability is extremely poor and mass productivity is poor.

Furthermore, since the coating work is done manually, it is extremely difficult to apply the coating uniformly, resulting in uneven quality of the diaphragm.

Furthermore, since the filler 2 such as silicone resin has a high specific gravity, it increases the mass of the diaphragm and reduces efficiency, and also has drawbacks such as low vibration loss and abnormal vibrations especially in the high frequency range, which increases distortion. Ta.

In view of these points, the present invention aims to simplify the manufacturing process and obtain a diaphragm with penetrating properties, and its features include a fibrous layer with a nonwoven fabric structure and a continuous microporous structure. A non-directional mesh adhesive is interposed between the diaphragm base fabric and the sheet, which has a base layer made of three-dimensionally entangled polymer nidistomer, and has almost the same structure as natural leather. At least it has a structure that is integrally molded under heat and pressure.

Hereinafter, one embodiment of the present invention will be described along with its manufacturing process with reference to FIGS. 2 to 4.

(I) Silk cloth 3 with a thickness of 0.1 mm as the diaphragm base cloth
The silk cloth 3 is immersed in a 5 to 10 part (weight concentration) phenolic resin solution, and then air-dried.

After 0-1, a sheet having as a base a base layer having a random three-dimensional structure in which this silk cloth 3, a fiber layer having a non-woven structure, and a polymer elastomer having a continuous microporous structure are three-dimensionally intertwined. An adhesive 7 having a non-woven fabric structure in which long fibers of the adhesive are intertwined in a network is interposed between the sheet 4 and the silk cloth 3, and the adhesive 7 is melted by heating and pressurizing, thereby bonding the sheet 4 and the silk cloth 3. At the same time, it is formed into a predetermined dome shape.

In this example, synthetic leather Clarino (registered trademark) USF-BL-04 (black) manufactured by Kuraray Co., Ltd. was used as the sheet 4.

As shown in Figure 2, the synthetic leather CLARINO is made by infiltrating a polyurethane resin solution between the polyurethane fiber layers of a non-woven fabric structure, and three-dimensionally intertwining this fiber layer with a polyurethane nystomer having a continuous microporous structure. In addition, on the surface of the base layer (non-woven fabric layer) 5 having a random three-dimensional structure, a surface layer (grain layer) made of a polyurethane elastomer having a continuous porous structure even finer than the polyurethane elastomer is continuously connected to the base layer 5. ) It has almost the same structure as that of natural leather.

Specifically, as sheet 4, the thickness is 0.35cm and the weight is 105S'/rr? Using a material having a basic physical property of specific gravity (apparent density) of 0.3, the above-mentioned silk cloth 3 is overlaid on the back side of this sheet 4, that is, on the back side of the coarse base layer 5 via a mesh adhesive 7. Then, heat and press them together to form a dome shape.

The thickness of sheet 4 after molding was 0.15 WrrIL.

As the mesh adhesive T, a product of Toyobo Co., Ltd. under the trade name Dynatuku Tape (registered trademark) was used.

As shown in Figure 3, this mesh adhesive T has a nonwoven structure in which long fibers of adhesive such as vinylidene chloride resin are intertwined in a mesh pattern, and unlike conventional film adhesives, it has an adhesive layer. Since it does not have a support material such as paper or non-woven fabric to support the adhesive, it has no directionality and stretches uniformly in all directions during heat-pressure molding, melts under heat and spreads uniformly over the entire adhesive surface. This feature allows for uniform adhesion over the entire adhesive surface.

Specifically, as the mesh adhesive T, Fiber thickness: 7-16 denier Thickness: 0.15mm I used the one from

Here, the silk cloth 3 is superimposed on the back side of the sheet 4 because
This is to make the adhesion between the coarse base layer 5 and the silk cloth 3 stronger and more complete.

In addition, the sheet 4 has an appropriate shape retention force due to molding, and the sheet 4 has a phenolic resin (some additive) impregnated into the silk cloth 3.
Since the shape force merely assists the above-mentioned shape retention force, impregnation of the silk cloth 3 with the phenol resin may be omitted if necessary.

The dome diaphragm manufactured as described above has sheet 4
Since the sheet 4 and the silk cloth 3 are bonded together with the non-directional mesh adhesive I, the mesh adhesive 7 stretches uniformly in all directions during molding, melts with heat, and spreads over the entire bonded surface, thereby bonding the sheet 4 and the silk cloth 3 together. are adhered, no wrinkles are generated on the surface of the sheet 1-4, the adhesive strength is uniform in all directions, and there is no uneven adhesion.

In addition, although the sheet 4 has a continuous microporous structure (in terms of physical properties) and has air permeability, this air permeability is to the extent that it is considered non-permeable as a diaphragm. The open cells are slightly crushed to create a structure in which finer open cells and closed cells coexist, resulting in a structure that is essentially non-porous. Because of this, there is no need for conventional manual sealing and drying processes, the quality is uniform, workability is significantly improved, and it is suitable for mass production.

Furthermore, the sheet 4 is a conventional filler (e.g. silicone).
The diaphragm mass can be reduced by about 30%, which improves efficiency and increases sound pressure by 1 to 1.5 dB. Also, the playback bandwidth in the high frequency range is widened and the extension in the high frequency range is reduced. You can get good quality playback sound.

Furthermore, during the molding process, the sheet 4 with a continuous microporous structure is slightly molded to the extent that it retains its original physical properties, and has the flexibility and elasticity (shape retention power) required for this type of diaphragm, as well as a moderate amount of vibration loss. is maintained, abnormal vibrations and distortions in the high frequency range are also reduced, and in combination with the above-mentioned increase in the reproduction bandwidth, it is possible to obtain glossy, high quality reproduced sound with good extension especially in the high frequency range.

Furthermore, the sheet 4 is excellent in terms of durability such as surface strength, abrasion resistance, layer resistance, bending fatigue resistance, etc., and is also excellent in terms of surrounding environment, especially cold and heat resistance (-200C to 70'C). It also has the advantage of being able to maintain the desired vibration characteristics for a long time.

Note that the present invention is not limited to the above embodiment (dome-shaped diaphragm), and it is possible to select various materials for the diaphragm base fabric, or to change the amount of additives impregnated into the base fabric. By taking appropriate measures, it can also be applied to cone-shaped, flat-plate, etc. diaphragms.

As described above, the present invention uses a base layer 5 in which a diaphragm base fabric such as a copper surface 3, a fiber layer having a nonwoven fabric structure, and a polymer elastomer having a continuous microporous structure are three-dimensionally intertwined. Since it has a structure in which a non-directional mesh adhesive 7 is interposed between the sheet 4 and the sheet 4 is integrally formed under heat and pressure,
Since the base fabric and the sheet can be bonded together at the same time as the diaphragm is formed, and the sheet is made non-porous, the manufacturing process is not only significantly simplified, but the quality is also uniform, making it suitable for mass production and providing excellent This has the advantage that a diaphragm with specific characteristics can be obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the structure of a conventional speaker diaphragm, and FIGS. 2 to 4 are diagrams showing the structure of a speaker diaphragm according to the present invention. 5 is a base layer, 4 is a sheet, 3 is a diaphragm base fabric, and 7 is an adhesive.

Claims (1)

[Scope of utility model registration request] On the surface of the base layer 5, which is a three-dimensional intertwining of a synthetic fiber layer with a non-woven structure and a polymer elastomer having a continuous microporous structure, a continuous porous structure that is even finer than the polymer elastomer is continuous to the base layer 5. An adhesive 7 having a non-woven fabric structure in which long fibers of the adhesive are intertwined in a mesh is interposed between the sheet 4 on which the surface layer 6 made of a polymeric elastomer having the diaphragm is formed and the diaphragm base fabric 3, and the adhesive 7 is heated and pressurized. A diaphragm for a speaker is obtained by bonding and molding the sheet 4 and the diaphragm base fabric 3.