US5111235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operating electrophotographic printing apparatus
Assignee: Ricoh Printing Systems Ltd
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Filing: 1991-02-26
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Granted: 1992-05-05
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Expires: 2011-02-26
Abstract
Abstract A method of operating an electrographic printing apparatus which employs a reversal development system with a two components developer wherein the bias voltage and the surface voltage are varied in synchronism with each other.
Inventors
- 👤 Hiroshi Ueno
- 👤 Yasuo Kikuchi
- 👤 Kunitomo Takahashi
- 👤 Koji Doi
- 👤 Tsukasa Onose
- 👤 Toshitaka Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:29
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/065
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
114 words
A method of operating an electrophotographic printing apparatus, comprising the steps of: charging a photosensitive body by using a charging unit; exposing a charged surface of said photosensitive body by using an exposing unit so as to form an electrostatic latent image on said surface of said photosensitive body; and developing said electrostatic latent image on said photosensitive body through a bias development system by using a developing unit, in which the relationship of a bias voltage V B applied to a developing roll of said developing unit and a surface potential V O of said photosensitive body satisfies the following conditions: V O =a.V B +b; 0<a; and 0 <b <V O .
Claim 2
Independent Claim
114 words
A method of operating an electrophotographic printing apparatus, comprising the steps of: charging a photosensitive body by using a charging unit; exposing a charged surface of said photosensitive body by using an exposing unit so as to form an electrostatic latent image on said surface of said photosensitive body; and developing said electrostatic latent image on said photosensitive body through a bias development system by using a developing unit, in which the relationship of a bias voltage V B applied to a developing roll of said developing unit and a surface potential V O of said photosensitive body satisfies the following conditions: V O =a.V B +b; 0<a; and 0 <b <V O .
Claim 3
Dependent Claim
51 words
A method of operating an electrophotographic printing apparatus according to claim 1, in which a circuit for changing said bias voltage V B applied to said developing roll in synchronism with said surface potential V O of said photosensitive body is operated by bias-voltage-surface-potential synchronization adjusting means of said developing unit.
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) | 1995-05-05 | 1995-11-04 | 1996-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-05 | 1999-11-04 | 2000-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-05 | 2003-11-04 | 2004-05-05 | $7700.00 | Window Closed / Lapsed |