JPS6015199B2 - Vibrating body for acoustic transducer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibrating body for an acoustic transducer such as a diaphragm for a speaker or microphone or a cantilever for a record player cartridge. The Young's modulus E of the vibrator material, or the Young's modulus E and the density p
It relates to a high-performance vibrating body for acoustic transducers that has a high ratio of

The materials used for the above-mentioned vibrating bodies are often aluminum, titanium, etc., which are lightweight and easy to roll. A specific vibration mode occurs in the entire board, causing a large peak in the frequency characteristics of the Takagi, which significantly impairs sound quality.In the case of cantilevers for record player cartridges, the cantilever occupies most of the effective mass of the vibration system. However, it was extremely difficult to reduce the effective mass of the vibration system needed to improve the performance of the cartridge.In other words, as the thickness and diameter of the pipe were reduced in an attempt to reduce the weight of the cantilever, the rigidity decreased. This had the disadvantage that the characteristics deteriorated due to

To improve the above characteristics, the ratio of Young's modulus E to density p is E/
This can be achieved by using a material with a large p (hereinafter referred to as specific elastic modulus). Materials with a large specific elastic modulus E/p include shelf elements, beryllium, etc., but shelf elements are difficult to obtain (especially high quality ones), and beryllium requires a large amount of money for pollution prevention equipment in the manufacturing process. I need. In addition, materials with large E/p values such as shelf elements and beryllium are generally difficult to process by rolling or pressing, and it requires a large amount of money to form them into a predetermined shape. It is limited. Therefore, a material that is easy to mold, such as aluminum or titanium, is molded into a predetermined shape, and using the molded material as a base, materials with high E/p, such as shelf elements and beryllium, can be attached physically or chemically. It is conceivable to obtain a coated diaphragm, cantilever, etc. by a vapor phase deposition method or the like. By the way, when forming a coating layer on a substrate by physical vapor deposition or chemical means, in order to improve the characteristics of the deposited film,
It is desirable to heat the product above qo, but in this case, the thermal expansion coefficients of the substrate and coating layer are significantly different, so mechanical distortion may occur after cooling, or cracks may occur in the coating layer, making it unusable. . It has also been proposed to provide a coating layer of beryllium or shelf grains on the substrate by vapor deposition, etc., and to peel only this coating layer from the substrate to form a vibrating body made of only beryllium or shelf minerals. The beryllium or shelf element coating layer formed by this method has the disadvantage of having low mechanical strength and being easily broken.

Furthermore, in order to form a coating layer on a substrate by means such as vapor deposition, an evaporation device such as electron beam heating is required, which requires a large amount of equipment and takes a long time to manufacture, resulting in a very high product cost. .

Therefore, a vibrating body for an acoustic transducer has been proposed in which a diffusion region made of a diffusion material having different properties from that of the base body is formed on a base body that is to be a vibrating body for an acoustic transducer. The present invention is directed to a vibrating body for an acoustic transducer in which a diffusion region made of a diffusion material is formed in a base, and its object is to use zirconium (Zr) and The object of the present invention is to provide a vibrating body for an acoustic transducer having a composition with the highest E/p in a vibrating body in which a diffusion region is formed by selecting each shelf element (B).

Hereinafter, the vibrating body for an acoustic transducer of the present invention will be explained with reference to the drawings. FIG. 1 shows an embodiment in which a vibrating body for an acoustic transducer in which a diffusion region is formed is applied to a dome-shaped diaphragm of a speaker, and shows a cross-sectional view of the dome-shaped diaphragm that is the vibrating body according to the present invention. , 1 is zirconium (Zr) with a thickness of 25 m
It is a base made of a thin plate of a single substance or a compound containing zirconium as the main component, and is formed by pressing or other means into a desired shape to become a dome-shaped diaphragm of a speaker. A diffusion region A of shelf elements (B) is formed over the entire surface.

This diffusion region A exists as a compound of zirconium (Zr) and shelf element (B), and its constituent component is zirconium bishelf (Zr&). In this way, while forming a diffusion region of shelf elements (B) in the zirconium substrate 1,
By forming the main component into two-shelf zirconium (Zr&), compounds of other shelf elements (B) and zirconium (Zr), such as shelved zirconium (ZrB), dodecyl-shelf zirconium (ZrB2), etc. Compared to the case of 5.
A vibrating body for a high-performance acoustic transducer with an extremely high Young's modulus E of 6×1 [k9′ pig 3] can be provided.

Next, an embodiment of the method for manufacturing a vibrating body for an acoustic transducer according to the present invention will be described.

FIG. 2 is a cross-sectional view of a dome-shaped diaphragm showing the process of manufacturing a dome-shaped diaphragm for a speaker as a vibrating body according to the present invention, and 1 is a zirconium (Z) with a thickness of 25 mm.
r) A base made of a thin plate, formed by means such as a press into the desired shape to become a dome-shaped diaphragm of a speaker, and both sides of which are coated with shelf elements (B), which is a diffusion material, by an application means. Layers 2A and 2B are formed.

In forming the coping layers 2A and 28 of shelving elements (B) on the substrate 1 by coating means, the shelving elements (B) are ground into powder, and the powdered shelving elements (B) are electrostatically coated. This can be done based on the principles of the law, or by preparing a suspension of this powdered shelf element (B) in an organic solvent such as trichloride or thinner, and applying it with a brush or spray. In this case, no matter which method is used, the coating layers 2A and 2B formed on the substrate 1 are a laminate of powdery shelving elements (B) having a desired thickness. Here, the powdery diffusion material has a diameter of 4 mm or less, the smaller the diameter of the particles, the larger the contact area with the substrate 1, the easier it is to diffuse, and the diameter of 50 m or less, preferably 10 m or less. One with particles is desirable. In addition, as a highly volatile organic solution for suspension, the solution is water (day 2
Compared to materials with relatively low volatility such as No. 0), even if the substrate 1 is dirty to some extent, it has the effect of cleaning it and quickly vaporizing it. The substrate 1 on which the coating layers 2A and 28 of shelf elements (B) as a diffusion material are formed has a temperature of 15
Shelf element (
B) is quickly diffused and introduced under the above-mentioned temperature conditions to form a diffusion region A of shelf elements (B) mainly composed of bishelf zirconium in the substrate 1.

After the desired heat treatment has been performed, the substrate 1 is lowered to room temperature, and after this, a dome-shaped diaphragm for a speaker having a diffusion region of shelf elements (B) within the substrate 1 is obtained. In the above-described embodiments of the present invention, the diaphragm for a dome-shaped speaker was explained as this type of oscillating body, but the diaphragm for a cone-shaped speaker, the diaphragm for a microphone, and the cantilever of a pickup cartridge may also be used. The present invention can also be applied to vibrating bodies for acoustic transducers such as the following.

Further, the diffusion region A is formed in the entire thickness direction of the substrate 1 or up to a certain depth, and in the case where it is formed in the entire surface direction of the substrate 1. However, these may be selected depending on the desired purpose of the provided acoustic transducer vibrating body.

[Brief Description of the Drawings] Fig. 1 is a sectional view of a dome-shaped diaphragm of a speaker, which is a vibrating body for an acoustic transducer according to the present invention, and Fig. 2 is a sectional view of a dome-shaped diaphragm of a speaker according to the present invention. FIG. 3 is a cross-sectional view of a dome-shaped diaphragm showing the process of manufacturing the plate. 1... Zirconium substrate, A... Shelf element diffusion region. Figure 1 Figure 2

Claims (1)

[Claims] 1. A vibrating body for an acoustic transducer, in which a coating layer of a boron compound is formed on a substrate formed into a desired shape, and a boron diffusion region is formed in the substrate by heat treatment.
A coating layer is formed on the substrate by applying boron particles with a diameter of 0 μm or less to the substrate using an electrostatic coating method, or by applying a suspension of boron particles with a diameter of 0 μm or less in a highly volatile organic solvent. A vibrating body for an acoustic transducer, characterized in that the boron diffusion region formed by diffusion is formed mainly of zirconium diboride (ZrB_2) by heating at a high temperature of about 1500°C.