US5068762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic charging device
Assignee: Canon Inc
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Filing: 1989-11-20
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Granted: 1991-11-26
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Expires: 2009-11-20
Abstract
Abstract An electrophotographic device has an electrophotographic photosensitive member and a blade for charging arranged in contact with the photosensitive member, the photosensitive member being charged by application of a voltage on the blade for charging, wherein the ten point surface average roughness Rz of the photosensitive member is 0.3 mu m to 5.0 mu m.
Inventors
- 👤 Toshiyuki Yoshihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:17
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/75; G03G15/02; G03G15/0208; G03G15/0216; G03G5/00; G03G5/005; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
53 words
An electrophotographic device having an electrophotographic photosensitive member and a blade for charging arranged in contact with said photosensitive member, said photosensitive member being charged by application of a voltage on the blade for charging, wherein the ten point surface average roughness Rz of said photosensitive member is 0.3 μm to 5.0 μm.
Claim 2
Dependent Claim
53 words
An electrophotographic device having an electrophotographic photosensitive member and a blade for charging arranged in contact with said photosensitive member, said photosensitive member being charged by application of a voltage on the blade for charging, wherein the ten point surface average roughness Rz of said photosensitive member is 0.3 μm to 5.0 μm.
Claim 3
Dependent Claim
21 words
An electrophotographic device according to claim 1, wherein the ten point surface average roughness Rz is 0.5 μm to 2.0 μm.
Claim 4
Dependent Claim
23 words
An electrophotographic device according to claim 1, wherein said photosensitive member comprises a photosensitive layer, the photosensitive layer consisting of a single layer.
Claim 5
Dependent Claim
16 words
An electrophotographic device according to claim 3, wherein the photosensitive layer contains an organic photoconductive substance.
Claim 6
Dependent Claim
48 words
An electrophotographic device according to claim 3, wherein the photosensitive layer comprises (i) a charge generation substance selected from the group consisting of azo pigments, phthalocyanine pigments, anthanthrone pigments and thiopyrilium dyes and (ii) a charge transport substance selected from the group consisting of hydrazone, stilbene and pyrazoline.
Claim 7
Dependent Claim
24 words
An electrophotographic device according to claim 1, wherein the photosensitive layer is a laminate of a charge generation layer and a charge transport layer.
Claim 8
Dependent Claim
50 words
An electrophotographic device according to claim 6 wherein the charge generation layer contains a charge generation substance selected from the group consisting of azo pigments, phthalocyanine pigments and thiopyrilium dyes and the charge transport layer contains a charge transport substance selected from the group consisting of hydrazone, stilbene and pyrazoline.
Claim 9
Dependent Claim
17 words
An electrophotographic device according to claim 1, wherein the photosensitive layer has a protective layer provided thereon.
Claim 10
Dependent Claim
30 words
An electrophotographic device according to claim 1, wherein the electroconductive substrate is a metal or a metal alloy selected from the group consisting of aluminum, aluminum alloy and stainless steel.
Claim 11
Dependent Claim
21 words
An electrophotographic device according to claim 1, wherein a subbing layer is provided between the electroconductive substrate and the photosensitive layer.
Claim 12
Dependent Claim
33 words
An electrophotographic device according to claim 1, wherein the blade for charging is a rubber selected from the group consisting of silicone rubber, urethane rubber, chloroprene rubber, butyl rubber, fluorine rubber and EPDM.
Claim 13
Dependent Claim
31 words
An electrophotographic device according to claim 11, wherein the blade for charging contains at least one selected from the group consisting of carbon, acetylene black, metal, metal oxide and electroconductive polymer.
Claim 14
Dependent Claim
21 words
An electrophotographic device according to claim 1, wherein the blade for charging has a resistance of 1 to 10 12 ohm.cm.
Claim 15
Dependent Claim
22 words
An electrophotographic device according to claim 1, wherein the blade for charging has a resistance of 10 2 to 10 10 ohm.cm.
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) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |