Patent US5268247A successfully refreshed from Google Patents.
US5268247A
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Electrophotographic copying machine and electrophotographic member therefor and method of forming an electrophotographic member
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 1991-09-24
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Granted: 1993-12-07
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Expires: 2011-09-24
Abstract
Abstract A printing drum (An electrophotographic member) for electrophotographic copying machines comprises a substrate, a photosensitive film formed on the substrate and a protective film formed on the photosensitive film and mainly comprising carbon at no lower than 50 atom % and including hydrogen at 10 to 40 atom % and nitrogen at 1 to 10 atom %. The protective film may further include fluorine at 0 to 1 atom %. The transparency of the protective film is controlled by adjusting the concentration of hydrogen. The resistivity of the protective film is controlled by adjusting the concentration of nitrogen. By this configuration, requirements for the protective film on the hardness, the transparency and the resistivity of the protective film are satisfied at the same time.
Inventors
- 👤 Shigenori Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:26
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/147; G03G5/14704; G03G5/02; G03G5/04; G03G5/08; G03G5/082; G03G5/08285
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
149 words
An electrophotographic machine comprising: means for charging an electrophotographic member; means for applying a light image to the charged electrophotographic member to form a latent charge image on the electrophotographic member; means for applying toner to the latent charge image to form a toner image; and means for transferring the toner image to a medium, wherein said electrophotographic member comprises: a substrate; a photosensitive film formed on said substrate; and a protective film formed on said photosensitive film where said protective film comprises a buffer layer of 100 to 400 kg/mm 2 Vickers hardness above said photosensitive film and an abrasion-proof layer of 1200 kg/mm 2 or higher Vickers hardness above said buffer layer and where each of said buffer layer and said abrasion-proof layer comprises carbon at no lower than 50 atom %, hydrogen at 10 to 40 atom %, and nitrogen at 1 to 10 atom %.
Claim 2
Dependent Claim
149 words
An electrophotographic machine comprising: means for charging an electrophotographic member; means for applying a light image to the charged electrophotographic member to form a latent charge image on the electrophotographic member; means for applying toner to the latent charge image to form a toner image; and means for transferring the toner image to a medium, wherein said electrophotographic member comprises: a substrate; a photosensitive film formed on said substrate; and a protective film formed on said photosensitive film where said protective film comprises a buffer layer of 100 to 400 kg/mm 2 Vickers hardness above said photosensitive film and an abrasion-proof layer of 1200 kg/mm 2 or higher Vickers hardness above said buffer layer and where each of said buffer layer and said abrasion-proof layer comprises carbon at no lower than 50 atom %, hydrogen at 10 to 40 atom %, and nitrogen at 1 to 10 atom %.
Claim 3
Dependent Claim
19 words
The electrophotographic machine as claimed in claim 1 wherein said photosensitive film is made of an organic photoconductive material.
Claim 4
Dependent Claim
25 words
The electrophotographic machine as claimed in claim 1 wherein said photosensitive film comprises an intermediate layer, a charge generating layer and a charge transporting layer.
Claim 5
Dependent Claim
20 words
The electrophotographic machine as claimed in claim 1 wherein the thickness of said buffer layer is 0.3 to 0.8 μm.
Claim 6
Dependent Claim
15 words
The electrophotographic machine as claimed in claim 1 wherein said substrate is made of aluminum.
Claim 7
Dependent Claim
22 words
The electrophotographic machine as claimed in claim 1 wherein said protective film further comprises fluorine at no higher than 1 atom %.
Claim 8
Dependent Claim
96 words
An electrophotographic member for electrophotographic machines comprising: a substrate; a photosensitive film formed on said substrate; and a protective film formed on said photosensitive film wherein said protective film comprises a buffer layer of 100 to 400 kg/mm 2 Vickers hardness above said photosensitive film and an abrasion-proof layer of 1200 kg/mm 2 or higher Vickers hardness above said buffer layer and where each of said buffer layer and said abrasion-proof layer comprises carbon at no lower than 50 atom %, hydrogen at 10 to 40 atom %, and nitrogen at 1 to 10 atom %.
Claim 9
Dependent Claim
96 words
An electrophotographic member for electrophotographic machines comprising: a substrate; a photosensitive film formed on said substrate; and a protective film formed on said photosensitive film wherein said protective film comprises a buffer layer of 100 to 400 kg/mm 2 Vickers hardness above said photosensitive film and an abrasion-proof layer of 1200 kg/mm 2 or higher Vickers hardness above said buffer layer and where each of said buffer layer and said abrasion-proof layer comprises carbon at no lower than 50 atom %, hydrogen at 10 to 40 atom %, and nitrogen at 1 to 10 atom %.
Claim 10
Dependent Claim
24 words
The member for electrophotographic machines as claimed in claim 7 wherein said protective film further comprises fluorine at no higher than 1 atom %.
Claim 11
Dependent Claim
21 words
The member for electrophotographic machines as claimed in claim 7 wherein said photosensitive film is made of an organic photoconductive material.
Claim 12
Dependent Claim
27 words
The member of electrophotographic machines as claimed in claim 7 wherein said photosensitive film comprises an intermediate layer, a charge generating layer and a charge transporting layer.
Claim 13
Dependent Claim
22 words
The member for electrophotographic machines as claimed in claim 7 wherein the thickness of said buffer layer is 0.3 to 0.8 μm.
Claim 14
Dependent Claim
48 words
The member for electrophotographic machines as claimed in claim 7 wherein said abrasion-proof layer has an absorption coefficient of no higher than 0.2 μm -1 at 780 nm wavelength, a vickers hardness of 800 to 2000 kg/mm 2 and a resistivity of 1×10 8 to 1×10 12 Ωcm.
Claim 15
Dependent Claim
17 words
The member for electrophotographic machines as claimed in claim 7 wherein said substrate is made of aluminum.
Claim 16
Independent Claim
89 words
A method of forming an electrophotographic member for electrophotographic machines comprising: forming a buffer layer of 100 to 400 kg/mm 2 Vickers hardness comprising carbon, hydrogen, and nitrogen on a photoconductor film provided on a substrate in a chamber with first gases introduced into said chamber, forming an abrasion-proof layer of 1200 kg/mm 2 or higher Vickers hardness comprising carbon, hydrogen, and nitrogen on said buffer layer in said chamber with second gases introduced into said chamber, wherein said first and second gases each comprises carbon, hydrogen, and nitrogen.
Claim 17
Independent Claim
89 words
A method of forming an electrophotographic member for electrophotographic machines comprising: forming a buffer layer of 100 to 400 kg/mm 2 Vickers hardness comprising carbon, hydrogen, and nitrogen on a photoconductor film provided on a substrate in a chamber with first gases introduced into said chamber, forming an abrasion-proof layer of 1200 kg/mm 2 or higher Vickers hardness comprising carbon, hydrogen, and nitrogen on said buffer layer in said chamber with second gases introduced into said chamber, wherein said first and second gases each comprises carbon, hydrogen, and nitrogen.
Claim 18
Dependent Claim
26 words
The method of claim 14 wherein said first and second gases each comprise a carbon containing gas, a hydrogen containing gas, and a nitrogen containing gas.
Claim 19
Dependent Claim
47 words
The method of claim 15 wherein said carbon containing gas comprises a gas selected from the group consisting of CH 4 , C 2 H 5 , C 3 H 8 , C 2 H 4 , C 2 H 2 , and C 6 H 6
Claim 20
Dependent Claim
14 words
The method of claim 15 wherein said nitrogen containing gas comprises NF 3 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-12-06 | 1997-06-07 | 1997-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-06 | 2001-06-07 | 2001-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-06 | 2005-06-07 | 2005-12-07 | $7700.00 | Window Closed / Lapsed |