US4837137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic photoreceptor
Assignee: Fuji Electric Co Ltd
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Filing: 1987-12-02
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Granted: 1989-06-06
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Expires: 2007-12-02
Abstract
Abstract In the photoreceptor described in the specification, an electroconductive base has an amorphous silicon type photoconductive layer coated over a blocking layer on the base and an amorphous carbon-containing surface layer, coated over a buffer layer on the photoconductive layer, has a hardness on the free surface side which is higher than the hardness on the buffer surface side. Apparatus for preparing the photoreceptor includes a CVD vacuum chamber and an arrangement for supplying selected layer-forming gases to the chamber in a controlled manner.
Inventors
- 👤 Koichi Aizawa
- 👤 Toyoki Kazama
- 👤 Yukio Takano
- 👤 Yukihisa Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:06
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/043; G03G5/0433; G03G5/08; G03G5/082; G03G5/08285; G03G5/14; G03G5/142; G03G5/144
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
55 words
An electrophotographic photoreceptor comprising an electroconductive base, a photoconductive layer comprising amorphous silicon over the base, a buffer layer over the photoconductive layer, and a surface layer comprising amorphous carbon over the buffer layer, the surface layer having a hardness on the free surface side which is higher than that on the buffer layer side.
Claim 2
Dependent Claim
55 words
An electrophotographic photoreceptor comprising an electroconductive base, a photoconductive layer comprising amorphous silicon over the base, a buffer layer over the photoconductive layer, and a surface layer comprising amorphous carbon over the buffer layer, the surface layer having a hardness on the free surface side which is higher than that on the buffer layer side.
Claim 3
Dependent Claim
28 words
An electrophotographic photoreceptor as claimed in claim 1 wherein the hardness of the surface layer on the free surface side is at least about 1500 kg/mm 2 .
Claim 4
Dependent Claim
15 words
An electrophotographic photoreceptor as claimed in claim 1 wherein the buffer transition layer comprises polysilane.
Claim 5
Dependent Claim
27 words
An electrophotographic photoreceptor according in claim 1, wherein the hardness of the surface layer on the free surface side is from 700 to 1500 Kg/mm 2 .
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) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |