JPS5853824Y2 - Diaphragm for speakers - 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 process, and a drying process after applying the sealant 2. Also, in the sealing process, the sealant 2 is applied several times with a brush, etc. Since the coating was done manually, the workability was extremely poor and mass productivity was poor.

Furthermore, since the coating work is done manually, uniform coating is extremely difficult, resulting in uneven quality of the diaphragm.

Furthermore, since the filler 2 such as silicone resin has a high specific gravity, the mass of the diaphragm increases and efficiency decreases, and vibration loss is small, causing abnormal vibrations especially in the high frequency range, resulting in increased distortion. There were drawbacks.

In view of these points, the present invention aims to simplify the manufacturing process and obtain a diaphragm with preferential characteristics.The present invention is characterized by a fiber layer with a non-woven fabric structure and a polymer with a continuous microporous structure. An adhesive in the form of a non-supporting film with no directionality between the diaphragm substrate and a sheet with a base layer that is three-dimensionally intertwined with an elastomer, and which has almost the same structure as natural leather. It has a structure in which it is integrally heated and press-molded with the

Hereinafter, one embodiment of the present invention will be described along with its manufacturing process with reference to FIGS. 2 to 5.

(I) A silk cloth 3 with a thickness of 0.5 mm is prepared as a diaphragm substrate, and this silk cloth 3 is immersed in a phenol resin solution of 5 to 10% (weight concentration), and then air-dried.

(2) After that, the adhesive is supported on a sheet 4 whose base is a base layer having a random three-dimensional structure, which is a three-dimensional entanglement of a fiber layer with a non-woven fabric structure and a polymer nidistomer having a continuous microporous structure. Base material (support) for
The film adhesive T in the form of a non-support material is laminated, and the silk cloth 3 is further overlaid and heated and pressurized to form the silk cloth 3.
and sheet 4 are bonded together and simultaneously formed into a predetermined dome shape.

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

As shown in Figure 2, Clarino synthetic leather is a random synthetic leather made by infiltrating polyurethane resin solution between polyimide fiber layers of a non-woven fabric structure, and three-dimensionally intertwining this fiber layer with a polyurethane elastomer having a continuous microporous structure. On the surface of the base layer (non-woven fabric layer) 50 having a three-dimensional three-dimensional structure, a surface layer (silver layer) 6 which is also a polyurethane elastomer having a continuous porous structure which is finer than the polyurethane nidistomer is continuously connected to the base layer 5. It has a structure that is almost the same as that of natural leather.

Specifically, sheet 4 has a thickness of 0.35mm and a weight of 105r/rr? Using a material having a physical property of a specific gravity (apparently density) of 0.3, the silk cloth 3 is laminated on the back side of this sheet 4, that is, on the back side of the coarse base layer 5 via a film adhesive 7. Then, heat and press them together to form a dome shape.

The thickness of the sheet 4 after molding was 0.15a.

As the film adhesive 7, a non-support dry film adhesive (trade name: Sony Bond Film NP-101) manufactured by Sony Chemical Co., Ltd. was used.

This non-support dry film adhesive 7 differs from conventional film adhesives in that it does not contain a base material (support) for supporting the adhesive in the adhesive layer. have

That is, as shown in FIG. 3, conventional film adhesives
It has a supported form with an adhesive layer 9 formed on both sides of a base material (support) 80 such as paper or nonwoven fabric, and has a directionality determined by the material, structure, etc. of the support 8. The non-support dry film adhesive γ is, as shown in FIG. It has a non-supported form with an adhesive layer 9 of approximately 50 microns in thickness, has no directionality, and is characterized by being able to uniformly stretch in all directions during molding, allowing for uniform adhesion throughout the entire adhesive box.

Here, the silk cloth 3 is superimposed on the back side of the sheet 4.
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 itself has an appropriate shape-retaining power through molding, and the shaping power of the phenol resin (filling agent) impregnated into the silk cloth 3 only assists in the shape-retaining power. Impregnation of the silk cloth 3 with phenolic 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 using a non-supporting, non-directional film adhesive 7, the film adhesive 7 stretches uniformly in all directions during molding, which causes wrinkles on the surface of the sheet 4. Moreover, the adhesive strength becomes uniform in all directions, and there is no adhesive unevenness.

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).
It is lightweight compared to the diaphragm, and the mass of the diaphragm can be reduced by about 30%, improving efficiency and raising the sound pressure by 1 to 1.5 dB.In addition, the playback bandwidth in the high frequency range is widened, and the high frequency range is expanded. You can get good quality playback sound.

Furthermore, in the molding process, the continuous microporous structure sheet 4 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 moderate vibration. Since the loss is maintained, abnormal vibrations and distortion in the high frequency range are also reduced, and together 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 has excellent durability such as surface strength, abrasion resistance, bending resistance and fatigue resistance, and is also excellent in the surrounding environment, especially in terms of cold and heat resistance (-20°C to 700°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-mentioned embodiment (not limited to the dome-shaped vibrating chest), but it is possible to select various materials for the base fabric of the diaphragm, or to adjust the amount of excipients impregnated into the base fabric appropriately. It can also be applied to cone-shaped, flat-plate, etc. diaphragms by taking measures such as those specified in .

As described above, the present invention is a sheet having as a base a diaphragm base cloth such as silk cloth 3, a base layer 5 in which a fiber layer having a non-woven structure and a polymer elastomer having a continuous microporous structure are three-dimensionally intertwined. 4, a non-supporting film adhesive 7 is interposed between the diaphragm and the diaphragm, and the base fabric and the sheet can be bonded together at the same time as the diaphragm is formed. As a result, the manufacturing process is not only significantly simplified, but also the quality is uniform, which facilitates mass production, and has the advantage that a diaphragm with excellent characteristics can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the structure of a conventional speaker diaphragm, and FIGS. 2 to 5 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 a film 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 nystomer having a continuous microporous structure, a continuous porous structure that is even finer than the polymer elastomer is continuous to the base layer 5. A non-supporting film adhesive I is interposed between the sheet 4 on which the surface layer 6 of a polymer nidistomer having a surface layer 6 is formed and the diaphragm base fabric 3, and heated and pressurized to bond the sheet 4 and the diaphragm. A speaker diaphragm formed by bonding and molding a base fabric 3.