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US4932859A
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Electrophotographic photoreceptor having doped and/or bilayer amorphous silicon photosensitive layer
Assignee: Fujifilm Business Innovation Corp
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Filing: 1988-07-05
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Granted: 1990-06-12
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Expires: 2008-07-05
Abstract
Abstract An electrophotographic photoreceptor having excellent dark resistance is disclosed, which comprises a photoconductive layer and a surface layer formed successively on a conductive substrate, wherein the photoconductive layer mainly comprises hydrogen-containing amorphous silicon, and the surface layer comprises amorphous carbon which contains not more than 50 atomic percent of hydrogen. The surface layer contains phosphorous or boron as a dopant and/or comprises two sublayers where the sublayer has a lower hydrogen content than the lower sublayer.
Inventors
- 👤 Shigeru Yagi
- 👤 Masayuki Nishikawa
- 👤 Te Nam Roh
- 👤 Ken-ichi Karakida
- 👤 Masahito Tokuhiro
- 👤 Noriyoshi Takahashi
- 👤 Yuzuru Fukuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:56
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/082; G03G5/08285
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
68 words
An electrophotographic photoreceptor having a photoconductive layer and a surface layer formed thereon successively on a conductive substrate, wherein said photoconductive layer mainly comprises hydrogen-containing amorphous silicon, and said surface layer consists essentially of amorphous carbon which contains from 5 to 50 atomic percent of hydrogen, and said surface layer is formed in contact with said photoconductive layer, said surface layer containing boron or phosphorus as a dopant.
Claim 2
Dependent Claim
68 words
An electrophotographic photoreceptor having a photoconductive layer and a surface layer formed thereon successively on a conductive substrate, wherein said photoconductive layer mainly comprises hydrogen-containing amorphous silicon, and said surface layer consists essentially of amorphous carbon which contains from 5 to 50 atomic percent of hydrogen, and said surface layer is formed in contact with said photoconductive layer, said surface layer containing boron or phosphorus as a dopant.
Claim 3
Dependent Claim
94 words
An electrophotographic photoreceptor having a photoconductive layer and a surface layer formed successively on a conductive substrate, wherein said photoconductive layer mainly comprises hydrogen-containing amorphous silicon and said surface layer consists essentially of amorphous carbon which contains not more than 50 atomic percent of hydrogen, and said surface layer is formed in contact with said photoconductive layer, wherein said surface layer is composed of two sublayers, the upper sublayer containing a lower hydrogen content than the hydrogen content in the lower sublayer, wherein both the upper sublayer and the lower sublayer contain some hydrogen.
Claim 4
Dependent Claim
94 words
An electrophotographic photoreceptor having a photoconductive layer and a surface layer formed successively on a conductive substrate, wherein said photoconductive layer mainly comprises hydrogen-containing amorphous silicon and said surface layer consists essentially of amorphous carbon which contains not more than 50 atomic percent of hydrogen, and said surface layer is formed in contact with said photoconductive layer, wherein said surface layer is composed of two sublayers, the upper sublayer containing a lower hydrogen content than the hydrogen content in the lower sublayer, wherein both the upper sublayer and the lower sublayer contain some hydrogen.
Claim 5
Dependent Claim
18 words
An electrophotographic photoreceptor according to claim 2 wherein said surface layer contains boron or phosphorus as a dopant.
Claim 6
Dependent Claim
22 words
An electrophotographic photoreceptor according to claim 1 wherein said dopant is present in an amount of 10 -4 to 1.0 atomic %.
Claim 7
Dependent Claim
22 words
An electrophotographic photoreceptor according to claim 3 wherein said dopant is present in an amount of 10 -4 to 1.0 atomic %.
Claim 8
Dependent Claim
72 words
An electrophotographic photoreceptor according to claim 1 wherein said surface layer is composed of two sublayers, the upper sublayer containing said dopant in an amount of from 10 -4 atomic percent to less than 1.0 atomic %, and the lower sublayer containing said dopant in an amount of 0.1 to 1.0 atomic %, provided that the content of said dopant in the upper sublayer is lower than that in the lower sublayer.
Claim 9
Dependent Claim
72 words
An electrophotographic photoreceptor according to claim 3 wherein said surface layer is composed of two sublayers, the upper sublayer containing said dopant in an amount of from 10 -4 atomic percent to less than 1.0 atomic %, and the lower sublayer containing said dopant in an amount of 0.1 to 1.0 atomic percent, provided that the content of said dopant in the upper layer is lower than that in the lower sublayer.
Claim 10
Dependent Claim
12 words
An electrophotographic photoreceptor according to claim 6 wherein said dopant is boron.
Claim 11
Dependent Claim
12 words
An electrophotographic photoreceptor according to claim 7 wherein said dopant is boron.
Claim 12
Dependent Claim
32 words
An electrophotographic photoreceptor according to claim 1 wherein said surface layer is composed of two sublayers, the upper sublayer containing a lower hydrogen content than the hydrogen content in the lower sublayer.
Claim 13
Dependent Claim
35 words
An electrophotographic photoreceptor according to claim 2 wherein the hydrogen content in said upper sublayer is 40 atomic % or less and the hydrogen content in said lower sublayer is 50 atomic % or less.
Claim 14
Dependent Claim
35 words
An electrophotographic photoreceptor according to claim 10 wherein the hydrogen content in said upper sublayer is 40 atomic % or less and the hydrogen content in said lower sublayer is 50 atomic % or less.
Claim 15
Dependent Claim
35 words
An electrophotographic photoreceptor according to claim 2 wherein the hydrogen content in said upper sublayer is 10 to 30 atomic % and the hydrogen content in said lower sublayer is 20 to 40 atomic %.
Claim 16
Dependent Claim
34 words
An electrophotographic photoreceptor according to claim 10 wherein the hydrogen content in said upper sublayer is 10 to 30 atomic % and the hydrogen content in said lower sublayer is 20 to 40 atomic%.
Claim 17
Dependent Claim
21 words
An electrophotographic photoreceptor according to claim 2, wherein the two sublayers as a whole contain 5 to 50 atomic percent hydrogen.
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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) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |