Patent US4529292A successfully refreshed from Google Patents.
US4529292A
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Electrophotographic reproduction process
Assignee: Ricoh Co Ltd
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Filing: 1982-12-28
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Granted: 1985-07-16
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Expires: 2002-12-28
Abstract
Abstract An electrophotographic reproduction process for forming an reproduced image of an original image with the use of a photosensitive member including a Se-As material as a photoconductive material. The process includes the steps of uniform charging, image exposure, developing, transferring, and discharging by irradiation of light. When the photosensitive member is subjected to repeated cycles of reproduction operation, the time period between the completion of discharging of the last preceding reproduction process and the initation of uniform charging of the next following reproduction process is set at a predetermined value which is 0.2 seconds or more in order to avoid the light fatigue effect of the photoconductive material.
Inventors
- 👤 Seiichi Ohseto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:05
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/06; G03G21/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
182 words
A process for forming a reproduced image of an original image with the use of a photosensitive member, said process being repetitively applicable to said photosensitive member and comprising the steps of: uniformly charging said photosensitive member; exposing said thus uniformly charged photosensitive member to a light image of said original image to form an electrostatic latent image corresponding to said original image on said photosensitive member; developing said latent image with toner particles to convert said latent image into a visible toner image; transferring said toner image to a transfer medium; and irradiating light to said photosensitive member to have said photosensitive member discharged for removal of residual charge thereby preparing said photosensitive member ready to be used in the next following reproduction cycle, wherein the improvement resides in that the step of uniformly charging for the next following reproduction process is initiated after the elapse of a predetermined time period determined by the light fatigue characteristic of said photosensitive member subsequent to completion of the step of irradiating light for removal of residual charge of the last preceding reproduction process.
Claim 2
Dependent Claim
182 words
A process for forming a reproduced image of an original image with the use of a photosensitive member, said process being repetitively applicable to said photosensitive member and comprising the steps of: uniformly charging said photosensitive member; exposing said thus uniformly charged photosensitive member to a light image of said original image to form an electrostatic latent image corresponding to said original image on said photosensitive member; developing said latent image with toner particles to convert said latent image into a visible toner image; transferring said toner image to a transfer medium; and irradiating light to said photosensitive member to have said photosensitive member discharged for removal of residual charge thereby preparing said photosensitive member ready to be used in the next following reproduction cycle, wherein the improvement resides in that the step of uniformly charging for the next following reproduction process is initiated after the elapse of a predetermined time period determined by the light fatigue characteristic of said photosensitive member subsequent to completion of the step of irradiating light for removal of residual charge of the last preceding reproduction process.
Claim 3
Dependent Claim
29 words
A process of claim 1 further comprising the step of cleaning said photosensitive member for removing the toner particles remaining on said photosensitive member after the step of transferring.
Claim 4
Dependent Claim
20 words
A process of claim 1 wherein said photosensitive member includes a photoconductive material having a relatively strong light fatigue characteristic.
Claim 5
Dependent Claim
13 words
A process of claim 3 wherein said photoconductive material includes a Se-As material.
Claim 6
Dependent Claim
16 words
A process of claim 4 wherein said Se-As material includes amorphous As 2 Se 3 .
Claim 7
Dependent Claim
17 words
A process of claim 3 wherein said predetermined time period is set at 0.2 seconds or more.
Claim 8
Dependent Claim
23 words
A process of claim 6 wherein the amount of contents of As in said photosensitive member ranges from 35 to 40% by weight.
Claim 9
Dependent Claim
16 words
A process of claim 7 wherein the amount of contents of As is 35.5% by weight.
Claim 10
Dependent Claim
24 words
A process of claim 1 wherein said step of irradiating light for removal of residual charge includes irradiation of red light and green light.
Claim 11
Dependent Claim
27 words
A process of claim 9 wherein said green light has a peak wavelength of 530 nm and said red light has a peak wavelength of 630 nm.
Claim 12
Dependent Claim
24 words
A process of claim 9 wherein the amount of light irradiated for removal of residual charge is at least 6.0×10 -1 μJ/cm 2 .
Claim 13
Dependent Claim
30 words
A process of claim 11 wherein said photosensitive member is charged during said step of uniform charging such that the surface potential of said photosensitive member becomes approximately 900 V.
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) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |