US4522904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic process
Assignee: FUJU ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT Ltd
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Filing: 1982-09-23
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Granted: 1985-06-11
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Expires: 2002-09-23
Abstract
Abstract In the specific embodiments described herein, the charge drop resulting from fatigue in an electrophotographic process using an a-Se:H photosensitive member is reduced by a stabilization exposure carried out for one to three cycles prior to use of the member for image formation. Longer wavelength light may be used for the stabilization exposure and shorter wavelength light may be used for the imaging and discharge steps.
Inventors
- 👤 Hideki Kina
- 👤 Toshiyuji Iijima
- 👤 Eizo Tanabe
- 👤 Toyoki Kazama
- 👤 Masaharu Namba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:11
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/0094
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
61 words
An electrophotographic process employing a photosensitive member having a layer of hydrogen-containing amorphous silicon comprising the steps of: exposing the surface of the photosensitive member to a substantially uniform charge stabilization light composed primarily of light having a wavelength above 600 nm at least once for charge stabilization treatment; and thereafter effecting a series of image-producing operations without charge stabilization treatment.
Claim 2
Dependent Claim
61 words
An electrophotographic process employing a photosensitive member having a layer of hydrogen-containing amorphous silicon comprising the steps of: exposing the surface of the photosensitive member to a substantially uniform charge stabilization light composed primarily of light having a wavelength above 600 nm at least once for charge stabilization treatment; and thereafter effecting a series of image-producing operations without charge stabilization treatment.
Claim 3
Dependent Claim
32 words
An electrophotographic process according to claim 1 wherein the charge stabilization light exposure is applied from a discharge light source for discharging the photosensitive member or from an image exposure light source.
Claim 4
Dependent Claim
34 words
An electrophotographic process according to claim 1 wherein the charge stabilization light exposure is applied from a charge stabilization light source which is not used for image exposure or for discharging the photosensitive member.
Claim 5
Dependent Claim
35 words
An electrophotographic process according to claim 1 wherein the image producing operations include an image exposure step employing light composed primarily of light having a short wavelength below 600 nm as the image exposure light.
Claim 6
Dependent Claim
24 words
An electrophotographic process according to claim 4, wherein the light employed for image exposure consists of light having a short wavelength below 600 nm.
Claim 7
Dependent Claim
32 words
An electrophotographic process according to claim 4 wherein the exposure light contains light of a long wavelength above 600 nm having an energy which is less than 30% of the total energy.
Claim 8
Dependent Claim
37 words
An electrophotographic process according to claim 1 wherein the image producing operations include the step of exposing the photosensitive member to a discharge light which is composed primarily of light having a short wavelength below 600 nm.
Claim 9
Dependent Claim
21 words
An electrophotographic process according to claim 7 wherein the discharge light consists of light having a short wavelength below 600 nm.
Claim 10
Dependent Claim
32 words
An electrophotographic process according to claim 7 wherein the discharge light contains light of a long wavelength above 600 nm having an energy which is less than 30% of the total energy.
Claim 11
Dependent Claim
29 words
An electrophotographic process according to any one of claims 1-9, wherein the charge stabilization treatment comprises one to three exposures of the photosensitive member to the charge stabilization light.
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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |