US4699494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process unit and image forming apparatus using such unit
Assignee: Canon Inc
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Filing: 1986-02-06
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Granted: 1987-10-13
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Expires: 2006-02-06
Abstract
Abstract The present invention solves the problem arising when a photosensitive medium and some or all of means for forming a latent image on the photosensitive medium are made into a unit which is removably mountable with respect to the body of an apparatus. This problem is attributable to the fact that the characteristic of the photosensitive medium is not constant, and lies in that the completed electrostatic latent image differs from one photosensitive medium to another. The present invention solves this problem by providing an adjusting function to the means of such unit itself used to form a latent image.
Inventors
- 👤 Haruhisa Honda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:54
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/16; G03G21/18; G03G21/1839; G03G21/1842; G03G21/185; G03G15/00; G03G15/02; G03G15/0266; G03G15/04; G03G15/043; G03G15/0435; G03G2215/00; G03G2215/00987; G03G2221/00; G03G2221/16; G03G2221/18; G03G2221/183; G03G2221/1838; G03G2221/1853; G03G2221/1876
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
An interchangeable process unit removably mountable with respect to the body of an image forming apparatus having lamp means, said process unit comprising: an endlessly movable photosensitive medium; process means for acting on said photosensitive medium; a housing for integrally supporting said photosensitive medium and said process means, and including two optical openings, one of which is for information light and the other of which is for introduction of light from the lamp means disposed outside of the process unit in order to eliminate a memory on said photosensitive medium.
Claim 2
Dependent Claim
90 words
An interchangeable process unit removably mountable with respect to the body of an image forming apparatus having lamp means, said process unit comprising: an endlessly movable photosensitive medium; process means for acting on said photosensitive medium; a housing for integrally supporting said photosensitive medium and said process means, and including two optical openings, one of which is for information light and the other of which is for introduction of light from the lamp means disposed outside of the process unit in order to eliminate a memory on said photosensitive medium.
Claim 3
Dependent Claim
18 words
A process unit according to claim 1, wherein said housing covers an upper portion of said photosensitive medium.
Claim 4
Dependent Claim
24 words
A process unit according to claim 1, wherein said housing also serves as a guide for mounting the process unit onto the apparatus body.
Claim 5
Dependent Claim
12 words
A process unit according to claim 1, further including a corona discharger.
Claim 6
Dependent Claim
28 words
A process unit according to claim 4, wherein said other opening is located upstream of said corona discharger with respect to the movement direction of said photosensitive medium.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |