US4697916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming apparatus
Assignee: Canon Inc
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Filing: 1986-06-05
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Granted: 1987-10-06
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Expires: 2006-06-05
Abstract
Abstract An image forming apparatus comprises latent image forming means for forming a latent image on a photosensitive medium, reference latent image forming means for forming a reference latent image adjacent to the latent image, a plurality of light-emitting means disposed at intervals of a pitch D equal to or smaller than the width l of the reference latent image, and means for drivingly controlling the plurality of light-emitting means in accordance with the size of the latent image.
Inventors
- 👤 Yutaka Komiya
- 👤 Masahiro Tomosada
- 👤 Shinichi Nakamura
- 👤 Masanori Miyata
- 👤 Masayuki Hirose
- 👤 Hideki Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:43
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/04018; G03G15/045; G03G15/047; G03G2215/00; G03G2215/04; G03G2215/0429; G03G2215/0431; G03G2215/0434; G03G2215/0436; G03G2215/0439; G03G2215/0446; G03G2215/0448; G03G2215/0451; G03G2215/0463
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
125 words
An image forming apparatus comprising: latent image forming means for forming a latent image corresponding to an original on a photosensitive medium, wherein the size of said latent image is varied continuously in accordance with selected magnification; reference latent image forming means for forming a reference latent image which is not to be developed, adjacent to said latent image, said reference latent image having a width dimension formed in accordance with the selected magnification; a plurality of light-emitting means disposed at intervals of a pitch equal to or smaller than the width dimension of said reference latent image as determined by a selected minimum magnification; means for controlling said plurality of light-emitting means in accordance with the size of said latent image of the original.
Claim 2
Dependent Claim
125 words
An image forming apparatus comprising: latent image forming means for forming a latent image corresponding to an original on a photosensitive medium, wherein the size of said latent image is varied continuously in accordance with selected magnification; reference latent image forming means for forming a reference latent image which is not to be developed, adjacent to said latent image, said reference latent image having a width dimension formed in accordance with the selected magnification; a plurality of light-emitting means disposed at intervals of a pitch equal to or smaller than the width dimension of said reference latent image as determined by a selected minimum magnification; means for controlling said plurality of light-emitting means in accordance with the size of said latent image of the original.
Claim 3
Dependent Claim
18 words
An image forming apparatus according to claim 1, wherein said plurality of light-emitting means are an LED array.
Claim 4
Dependent Claim
37 words
An image forming apparatus according to claim 1, wherein said reference latent image forming means forms a white latent image adjacent to the latent image of an original whose size is variable in accordance with magnification factor.
Claim 5
Dependent Claim
25 words
An image forming apparatus according to claim 1, wherein said reference latent image forming means includes an original pressure plate having a white back surface.
Claim 6
Dependent Claim
127 words
An image forming apparatus comprising: latent image forming means for forming a latent image corresponding to an original on a photosensitive medium, wherein the size of said latent image is varied continuously in accordance with a selected magnification; reference latent image forming means for forming a reference latent image which is not to be developed, adjacent to said latent image, said reference latent image having a width dimension formed in accordance with the selected magnification; a plurality of light-emitting means each having a width which is in a predetermined relation with the width dimension of said reference latent image as determined by a selected minimum magnification; and means for controlling said plurality of light-emitting means in accordance with the size of said latent image of the original.
Claim 7
Dependent Claim
127 words
An image forming apparatus comprising: latent image forming means for forming a latent image corresponding to an original on a photosensitive medium, wherein the size of said latent image is varied continuously in accordance with a selected magnification; reference latent image forming means for forming a reference latent image which is not to be developed, adjacent to said latent image, said reference latent image having a width dimension formed in accordance with the selected magnification; a plurality of light-emitting means each having a width which is in a predetermined relation with the width dimension of said reference latent image as determined by a selected minimum magnification; and means for controlling said plurality of light-emitting means in accordance with the size of said latent image of the original.
Claim 8
Dependent Claim
39 words
An image forming apparatus according to claim 5, wherein each of said plurality of light-emitting means is of a width equal to or smaller than the width dimension of said reference latent image determined by said selected minimum magnification.
Claim 9
Dependent Claim
18 words
An image forming apparatus according to claim 6, wherein said plurality of light-emitting means are an LED array.
Claim 10
Dependent Claim
25 words
An image forming apparatus according to claim 5, wherein said reference latent image forming means includes an original pressure plate having a white back surface.
Claim 11
Dependent Claim
38 words
An image forming apparatus according to claim 5, wherein said reference latent image forming means forms a white latent image adjacent to the latent image of an original whose size is variable in accordance with a magnification factor.
References Cited (Backward Citations)
US3685894A
Cited
DE2361670A1
Cited
US3834807A
Cited
US4046467A
Cited
US4291643A
Cited
GB2011647A
Cited
DE2900366A1
Cited
JPS54136333A
Cited
US4255042A
Cited
US4334763A
Cited
US4344691A
Cited
US4435064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |