US4017170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic device
Assignee: Canon Inc
•
Filing: 1975-07-31
•
Granted: 1977-04-12
•
Expires: 1995-07-31
Abstract
Abstract This invention provides an electrophotographic device by which the surface potential of the photosensitive member is made substantially uniform at the time of termination of the photocopying process by rotating the photosensitive member through one revolution after the completion of the copying process while subjecting the photosensitive member to A.C. corona discharge or light exposure. Further, the reflecting mirror and the in-mirror lens are integrally rotated so as to adjust the light path length to obtain the most effective exposure. Moreover, the ratio of width of the central portion and both end portions of the slit for exposure can be varied to obtain the uniform and effective exposure.
Inventors
- 👤 Shigehiro Komori
- 👤 Hisashi Sakamaki
- 👤 Hiroyuki Hattori
- 👤 Toshihide Iida
- 👤 Koichi Miyamoto
- 👤 Kazumi Umezawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:26
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/28; G03G15/30; G03G21/00; G03G21/0005; G03G21/0011
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
An electrophotographic copying device comprising a photosensitive member, charging means and exposing means for forming an electrostatic latent image on said photosensitive member, developing means for visualizing said electrostatic latent image, means for fixing said visible image, means for transporting copying paper, means for transferring said visible image onto said copying paper, and means for making the surface potential of the photosensitive member substantially uniform after the termination of a copying cycle and before the complete cessation of operation of the device.
Claim 2
Dependent Claim
82 words
An electrophotographic copying device comprising a photosensitive member, charging means and exposing means for forming an electrostatic latent image on said photosensitive member, developing means for visualizing said electrostatic latent image, means for fixing said visible image, means for transporting copying paper, means for transferring said visible image onto said copying paper, and means for making the surface potential of the photosensitive member substantially uniform after the termination of a copying cycle and before the complete cessation of operation of the device.
Claim 3
Dependent Claim
71 words
An electrophotographic device as defined in claim 1 characterized in that said means for providing a uniform surface potential includes AC corona discharge means and means for providing relative movement between said discharge means and said photosensitive member to provide an AC corona discharge over the entire image receiving surface of said photosenstive member after the termination of a copying cycle and before said complete cessation of operation of the device.
Claim 4
Dependent Claim
69 words
An electrophotographic device as defined in claim 1 characterized in that said means for providing a uniform surface potential includes light exposure means and means for providing relative movement between said light exposure means and said photosensitive member to provide light exposure over the entire image receiving surface of said photosensitive member after the termination of a copying cycle and before said complete cessation of operation of the device.
Claim 5
Dependent Claim
55 words
An electrophotographic device as defined in claim 1 characterized in that said paper receiving tray means comprises a main tray having an upwardly inclined plane with respect to the discharging direction of said copying paper and an auxiliary tray connected at the extreme end of said main tray and disposed in a downwardly inclined plane.
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) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |