Claims
- 1. In a method for producing an electro-acoustic transducer comprising a vibrating member and means for vibrating the vibrating member, the improvement comprising the step of: introducing a mixture of a gaseous carbon compound and an inert gas and/or hydrogen into a furnace; subjecting said mixture to thermal decomposition to thereby deposit a layer of carbon on a surface of a mold former having a desired configuration, wherein the flow rate of said gaseous carbon compound is sufficiently high that the crystallographic c-axis of said layer of carbon is substantially perpendicular to the surface of said layer of carbon; separating said layer of carbon from said mold former to thus obtain said vibrating member; and mounting said vibrating member in a position to be vibrated by said vibrating means.
- 2. The method of claim 1 wherein said carbon layer has a Young's Modulus above 16,000 kg/cm.sup.2.
- 3. The method of claim 1 wherein, in said step of subjecting said mixture to thermal decomposition, a temperature in a range of 1,150.degree. C. to 1,250.degree. C. is utilized.
- 4. The method of claim 3 wherein, in said step of introducing said mixture into said furnace, said mixture has a continuous flow rate above 200 cc/min.
- 5. The method of claim 1 further comprising the step of, following said step of subjecting said mixture to thermal decomposition, subjecting said layer to a heat treatment in an inert gas atmosphere at a temperature in a range of 2400.degree. C. to 2700.degree. C. for a time in a range of 3 to 60 minutes.
Priority Claims (1)
Number |
Date |
Country |
Kind |
52/20192 |
Feb 1977 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 880,747, filed Feb. 24, 1978, now abandoned.
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3138435 |
Diefendorf |
Jun 1964 |
|
3297406 |
Diefendorf |
Jan 1967 |
|
3410746 |
Turkat et al. |
Nov 1968 |
|
3720499 |
Hirayama et al. |
Mar 1973 |
|
4254184 |
Tsukagoshi et al. |
Mar 1981 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
880747 |
Feb 1978 |
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