US4772513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming a hard carbon thin film on article and applications thereof
Assignee: Trio KK
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Filing: 1987-11-04
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Granted: 1988-09-20
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Expires: 2007-11-04
Abstract
Abstract A method of forming diamond-like carbon layer which is advantageously adaptable as a coating layer on acoustic diaphragms. In the method, carbon vaporized out of solid carbon source is deposited onto the surface of the diaphragm as the coating layer in the atomosphere of catalystic gas, for instance, H 2 +Ar or H 2 of about 10 -4 Torr. The deposited carbon layer on the surface of the diaphragm is an amorphous carbon of inclusion of hybridized orbital SP 2 bond and hybridized orbital SP 3 bond and crystalline carbon particles of hybridized orbital SP 3 bond dispersed in the amorphous carbon, or an amorphous carbon of inclusion of hybridized orbital SP 2 bond and hybridized orbital SP 3 bond.
Inventors
- 👤 Masakatsu Sakamoto
- 👤 Shuhei Ohta
- 👤 Shiro Iwakura
- 👤 Kaoru Yamazaki
- 👤 Yoichi Yaguchi
- 👤 Hiroaki Toshima
- 👤 Tsugio Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:57
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/32; C23C14/06; C23C14/0605; H; H04; H04R; H04R31/00; H04R31/003; Y; Y10; Y10T; Y10T428/00; Y10T428/30; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
70 words
An acoustic diaphragm comprising: a diaphragm body; and a carbon layer coated on the surface of said diaphragm, the carbon layer being amorphous carbon of inclusion of hybridized orbital SP 2 bond and hybridized orbital SP 3 bond and crystalline carbon particles of hybridized orbital SP 3 bond dispersed in said amorphous carbon or amorphous carbon of inclusion of hybridized orbital SP 2 bond and hybridized orbital SP 3 bond.
Claim 2
Dependent Claim
70 words
An acoustic diaphragm comprising: a diaphragm body; and a carbon layer coated on the surface of said diaphragm, the carbon layer being amorphous carbon of inclusion of hybridized orbital SP 2 bond and hybridized orbital SP 3 bond and crystalline carbon particles of hybridized orbital SP 3 bond dispersed in said amorphous carbon or amorphous carbon of inclusion of hybridized orbital SP 2 bond and hybridized orbital SP 3 bond.
Claim 3
Dependent Claim
15 words
An acoustic diaphragm according to claim 1, wherein said diaphragm body is made of metal.
Claim 4
Dependent Claim
12 words
An acoustic diaphragm according to claim 2, wherein said metal is titanium.
Claim 5
Dependent Claim
15 words
An acoustic diaphragm according to claim 1, wherein said diaphragm body is made of ceramic.
Claim 6
Dependent Claim
14 words
An acoustic diaphragm according to claim 2, wherein said ceramic is β type SiC.
Claim 7
Dependent Claim
21 words
An acoustic diaphragm according to claim 1, wherein said diaphragm is made of composite material including matrix member and fiber member.
Claim 8
Dependent Claim
19 words
An acoustic diaphragm according to claim 1, further comprising an intermediate layer between the diaphragm and the carbon layer.
Claim 9
Dependent Claim
21 words
An acoustic diaphragm according to claim 1, wherein said carbon layer is coated on the opposite surfaces of said diaphragm body.
Claim 10
Dependent Claim
10 words
A speaker including the acoustic diaphragm according to claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |