US4821068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming apparatus
Assignee: Canon Inc
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Filing: 1988-06-28
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Granted: 1989-04-11
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Expires: 2008-06-28
Abstract
Abstract An image formation apparatus has an image forming section including an optical system for forming an image corresponding to an image of an original, a potential sensor for measuring a surface potential of a photosensitive drum for forming a latent image thereon, a potential measurement circuit for calculating an average value of the surface potential, and a controller for controlling an exposure of a halogen lamp according to an output for the potential measurement circuit. The apparatus can reproduce optimal images of different types of originals including newspaper articles or the like which generally cause background fogging.
Inventors
- 👤 Toshio Honma
- 👤 Hiroaki Takeda
- 👤 Tadashi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:23
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5025; G03G15/04; G03G15/043; G03G15/5016
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
153 words
An image formation apparatus comprising: image forming means for forming a copy image of an original image on a recording medium, said image forming means being capable of reproducing the original image with different selectable copy magnification; detecting means for detecting a density of the original image; and control means responsive to an output of said detecting means for controlling an operable condition of said image forming means so as to provide an adequate density of the copy image, said control means being operable to obtain control data in accordance with the output of said detecting means, wherein a predetermined relation exists between the control data and the density of the original image, and to control the operable condition of said image forming means based on the thus obtained control data, wherein a relation between the density of the original image and the control data is varied in accordance with the copy magnification.
Claim 2
Dependent Claim
153 words
An image formation apparatus comprising: image forming means for forming a copy image of an original image on a recording medium, said image forming means being capable of reproducing the original image with different selectable copy magnification; detecting means for detecting a density of the original image; and control means responsive to an output of said detecting means for controlling an operable condition of said image forming means so as to provide an adequate density of the copy image, said control means being operable to obtain control data in accordance with the output of said detecting means, wherein a predetermined relation exists between the control data and the density of the original image, and to control the operable condition of said image forming means based on the thus obtained control data, wherein a relation between the density of the original image and the control data is varied in accordance with the copy magnification.
Claim 3
Dependent Claim
158 words
An image formation apparatus comprising: image forming means for forming a copy image of an original image on a recording medium; detecting means for detecting a density of the original image; control means responsive to an output of said detecting means for controlling an operable condition of said image forming means so as to provide an adequate density of the copy image; display means for displaying a copy density set in accordance with the output of said detecting means; and selecting means for selecting either a first mode in which said control means controls the operable condition of said image forming means, and said display means displays a copy density set in accordance with the output of said detecting means, or a second mode in which said display means displays a copy density set in accordance with the output of said detecting means, but said control means does not control the operable condition of said image forming means.
Claim 4
Dependent Claim
158 words
An image formation apparatus comprising: image forming means for forming a copy image of an original image on a recording medium; detecting means for detecting a density of the original image; control means responsive to an output of said detecting means for controlling an operable condition of said image forming means so as to provide an adequate density of the copy image; display means for displaying a copy density set in accordance with the output of said detecting means; and selecting means for selecting either a first mode in which said control means controls the operable condition of said image forming means, and said display means displays a copy density set in accordance with the output of said detecting means, or a second mode in which said display means displays a copy density set in accordance with the output of said detecting means, but said control means does not control the operable condition of said image forming means.
Claim 5
Dependent Claim
26 words
An apparatus according to claim 2, wherein an image corresponding to the original image is formed after the operation condition is controlled in the first mode.
Claim 6
Dependent Claim
68 words
An apparatus according to claim 2, further comprising setting means for manually setting the density of the original image, and wherein said apparatus is operative in an automatic density control mode for controlling the operation condition in accordance with the detection value from said detecting means and in a manual density control mode for controlling the operation condition in accordance with the set value by said setting means.
Claim 7
Dependent Claim
36 words
An apparatus according to claim 4, wherein the density is displayed at said display means and the mode is shifted to the manual density control mode in accordance with the detection value in the second mode.
Claim 8
Dependent Claim
22 words
An apparatus according to claim 2, wherein said display means has a plurality of light-emitting elements which display the copy density stepwise.
Claim 9
Dependent Claim
66 words
An image forming apparatus comprising: image forming means for forming a copy image of an original image on a recording medium; detecting means for detecting an image forming condition; display means for displaying a set copy density; and control means for controlling said display means so as to display data according to an output of said detecting means, said data being different from said copy density.
Claim 10
Dependent Claim
66 words
An image forming apparatus comprising: image forming means for forming a copy image of an original image on a recording medium; detecting means for detecting an image forming condition; display means for displaying a set copy density; and control means for controlling said display means so as to display data according to an output of said detecting means, said data being different from said copy density.
Claim 11
Dependent Claim
19 words
An apparatus according to claim 7, wherein said data is data on a surface state of the recording medium.
Claim 12
Dependent Claim
14 words
An apparatus according to claim 8, wherein the surface state is a surface potential.
Claim 13
Dependent Claim
32 words
An apparatus according to claim 7, wherein said display means comprises a plurality of light-emitting elements, and the other data is digitally displayed by controlling flashing of said plurality of light-emitting elements.
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) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |