US4395814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic vibrating element of graphite and method of manufacturing same
Assignee: Pioneer Corp
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Filing: 1981-10-27
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Granted: 1983-08-02
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Expires: 2001-10-27
Abstract
Abstract An acoustic vibrating element, such a domed speaker diaphragm A or a phonographic pickup cantilever B, is formed by vapor deposition on an easily separable mold member 5 of tantalum or tantalum alloy when a mixture of a hydrocarbon gas and an inert gas is passed through a furnace heated to a temperature of 1150° C.-1250° C. at a flow rate in excess of 200 cm/min. The c-axis crystalline orientation of the resulting graphite element is substantially perpendicular to its surface, which provides a Young's modulus above 16,000 Kg/cm 2 .
Inventors
- 👤 Tsunehiro Tsukagoshi
- 👤 Teruo Tohma
- 👤 Shinichi Yokozeki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:43
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/16; H04R1/18; H04R7/00; H04R7/02; H04R7/12; H04R7/127; H04R2307/00; H04R2307/023; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
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.
Claim 2
Dependent Claim
128 words
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.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein said carbon layer has a Young's Modulus above 16,000 kg/cm 2 .
Claim 4
Dependent Claim
29 words
The method of claim 1 wherein, in said step of subjecting said mixture to thermal decomposition, a temperature in a range of 1,150° C. to 1,250° C. is utilized.
Claim 5
Dependent Claim
26 words
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.
Claim 6
Dependent Claim
55 words
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° C. to 2700° C. for a time in a range of 3 to 60 minutes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |