Patent US4657374A successfully refreshed from Google Patents.
US4657374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Development system for photoreceptor having surface potential and a large amount of charge
Assignee: Panasonic Holdings Corp
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Filing: 1985-06-18
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Granted: 1987-04-14
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Expires: 2005-06-18
Abstract
Abstract An electrophotographic apparatus which includes a photoreceptor mainly composed of amorphous silicone and a developing device employing a developing material including electrically insulative composite components. The developing device has a developing sleeve impressed with developing bias voltage on which AC voltage is superposed, and a magnetic roller having magnetic poles and accommodated within the developing sleeve.
Inventors
- 👤 Yukimasa Kuramoto
- 👤 Eiichiro Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:35
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0907; G03G13/00; G03G13/06; G03G13/08; G03G13/09
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
77 words
An electrophotographic apparatus comprising: a photoreceptor mainly composed of amorphous silicon having a thickness in the range of 5 to 25 μm and low surface potential, and a developing device employing a developing material including electrically insulative composite components, said developing device having a developing sleeve and means for impressing on said sleeve a developing bias voltage on which an AC voltage is superposed, and a magnetic roller having magnetic poles and accommodated within said developing sleeve.
Claim 2
Dependent Claim
77 words
An electrophotographic apparatus comprising: a photoreceptor mainly composed of amorphous silicon having a thickness in the range of 5 to 25 μm and low surface potential, and a developing device employing a developing material including electrically insulative composite components, said developing device having a developing sleeve and means for impressing on said sleeve a developing bias voltage on which an AC voltage is superposed, and a magnetic roller having magnetic poles and accommodated within said developing sleeve.
Claim 3
Dependent Claim
56 words
An electrophotographic apparatus as claimed in claim 1, wherein the thickness of the developing material layer on the surface of the developing sleeve of said developing device is larger than the distance between the surface of said developing sleeve and the surface of the photoreceptor, said distance being in the range of 0.2 to 1 mm.
Claim 4
Dependent Claim
31 words
An electrophotographic apparatus as claimed in claim 2, wherein said distance between the surface of the developing sleeve and the photoreceptor surface is in the range of 0.2 to 0.4 mm.
Claim 5
Dependent Claim
113 words
An electrophotographic apparatus comprising: a photoreceptor mainly composed of amorphous silicon having a thickness in the range of 5 to 25 μm and low surface potential, and a developing device employing a developing material including electrically insulative composite components, said developing device having a developing sleeve and means for impressing on said sleeve a developing bias voltage on which an AC voltage is superposed, and a magnetic roller having magnetic poles and accommodated within said developing sleeve, the thickness of the developing material layer on the surface of the developing sleeve of said developing device being larger than the distance between the surface of said developing sleeve and the surface of the photoreceptor.
Claim 6
Dependent Claim
113 words
An electrophotographic apparatus comprising: a photoreceptor mainly composed of amorphous silicon having a thickness in the range of 5 to 25 μm and low surface potential, and a developing device employing a developing material including electrically insulative composite components, said developing device having a developing sleeve and means for impressing on said sleeve a developing bias voltage on which an AC voltage is superposed, and a magnetic roller having magnetic poles and accommodated within said developing sleeve, the thickness of the developing material layer on the surface of the developing sleeve of said developing device being larger than the distance between the surface of said developing sleeve and the surface of the photoreceptor.
Claim 7
Dependent Claim
20 words
An electrophotographic apparatus as claimed in claim 4, wherein said developing sleeve is rotated, with said magnetic roller being fixed.
Claim 8
Dependent Claim
23 words
An electrophotographic apparatus as claimed in claim 4, wherein both said developing sleeve and said magnetic roller of the developing device are rotated.
Claim 9
Dependent Claim
31 words
An electrophotographic apparatus as claimed in claim 4, wherein said distance between the surface of the developing sleeve and the photoreceptor surface is in the range of 0.2 to 1 mm.
Claim 10
Dependent Claim
31 words
An electrophotographic apparatus as claimed in claim 4, wherein said distance between the surface of the developing sleeve and the photoreceptor surface is in the range of 0.2 to 0.4 mm.
Claim 11
Dependent Claim
58 words
An electrophotographic apparatus as claimed in claim 1 in which said photoreceptor comprises an aluminum substrate, a p-type layer of amorphous silicon on said substrate, a layer of intrinsic amorphous silicon on said p-type layer, and a layer of a nitride taken from the group consisting of silicon nitride and silicon oxide on said intrinsic amorphous silicon layer.
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) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |