US4583839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image recording apparatus having automatic image density regulation function
Assignee: Canon Inc
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Filing: 1983-03-24
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Granted: 1986-04-22
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Expires: 2003-03-24
Abstract
Abstract An image recording apparatus such as a copying machine has a surface potentiometer for detecting the surface potential of the original image, a microcomputer for integrating the measured surface potential, AC and DC development bias control circuits for controlling the development bias, and a lamp regulator for controlling exposure. In accordance with the integrated value of the surface potential, the development bias or exposure is controlled so as to allow production of an image having excellent gradation even when the original is a halftone image such as a photograph. The apparatus allows selection between automatic or manual control of development bias and exposure.
Inventors
- 👤 Koji Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:23
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5033; G03G15/5037
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
121 words
An image apparatus comprising: image forming means for forming an image on a recording medium in accordance with an original image; detecting means for detecting a density of the original image; control means for integrating an output from said detecting means for a predetermined period of time and for controlling an image formation condition in accordance with the integrated output, said control means being operative in a first mode in which the image formation condition is controlled in accordance with the integrated output, and being operative in a second mode in which the image formation condition is controlled in a predetermined manner independently of the density of the original; and selecting means for selecting one of the first and second modes.
Claim 2
Dependent Claim
121 words
An image apparatus comprising: image forming means for forming an image on a recording medium in accordance with an original image; detecting means for detecting a density of the original image; control means for integrating an output from said detecting means for a predetermined period of time and for controlling an image formation condition in accordance with the integrated output, said control means being operative in a first mode in which the image formation condition is controlled in accordance with the integrated output, and being operative in a second mode in which the image formation condition is controlled in a predetermined manner independently of the density of the original; and selecting means for selecting one of the first and second modes.
Claim 3
Dependent Claim
52 words
An apparatus according to claim 1, wherein the predetermined period of time is a scanning period for detection of the density of the original image, and said control means integrates the output from said detecting means for the scanning period and controls the image formation condition in accordance with an integrated output.
Claim 4
Dependent Claim
38 words
An apparatus according to claim 1 or 2, wherein said image forming means includes exposure means for exposing an original and said control means controls the operating condition of said exposure means in accordance with the integrated output.
Claim 5
Dependent Claim
23 words
An apparatus according to claim 1 or 2, wherein said detecting means detects the density of the image formed on the recording medium.
Claim 6
Dependent Claim
42 words
An apparatus according to claim 4, wherein said image forming means includes means for forming an electrostatic latent image on the recording medium, and said detecting means includes means for detecting a potential of the electrostatic latent image on the recording medium.
Claim 7
Dependent Claim
22 words
An apparatus according to claim 2, wherein the scanning period varies in accordance with an original size or an image recording magnification.
Claim 8
Dependent Claim
20 words
An apparatus according to claim 1, wherein said detecting means detects the density of the original image before image recording.
Claim 9
Dependent Claim
23 words
An apparatus according to claim 7, wherein said detecting means standardizes the image formation condition before detecting the density of the original image.
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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) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |