US4511240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic recording apparatus
Assignee: Canon Inc
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Filing: 1982-01-08
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Granted: 1985-04-16
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Expires: 2002-01-08
Abstract
Abstract An electrostatic recording apparatus has a sensor for detecting a surface potential of a photosensitive member on which an electrostatic latent image is formed and a controller for controlling a developing bias voltage in accordance with the detected surface potential. The developing bias voltage includes an A.C. component and a D.C. component which are selectively used in accordance with a latent image potential. The frequency of the A.C. developing bias and the magnitude of the D.C. developing bias are variable so that an optimum quality of image is reproduced.
Inventors
- 👤 Koji Suzuki
- 👤 Kouki Kuroda
- 👤 Jyoji Nagahira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:35
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5033; G03G15/5037; G03G15/06; G03G15/065
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
An image forming apparatus comprising: exposure means for exposing an image onto a recording medium; image forming means utilizing said exposed image for forming an image on said recording medium; and control means for detecting an image forming condition corresponsing to reflected light from a sample member and for controlling an operation condition of said exposure means based on the detected condition, wherein said control means further controls an operation condition of said image forming means in accordance with magnification of the image formation.
Claim 2
Dependent Claim
84 words
An image forming apparatus comprising: exposure means for exposing an image onto a recording medium; image forming means utilizing said exposed image for forming an image on said recording medium; and control means for detecting an image forming condition corresponsing to reflected light from a sample member and for controlling an operation condition of said exposure means based on the detected condition, wherein said control means further controls an operation condition of said image forming means in accordance with magnification of the image formation.
Claim 3
Dependent Claim
18 words
An image forming apparatus according to claim 1 wherein said sample member is illuminated by said exposure means.
Claim 4
Dependent Claim
42 words
An image forming apparatus according to claim 1 or 2 wherein said image forming means includes means for charging said recording medium, and wherein an operation condition of said charging means is controlled in accordance with said magnification of the image formation.
Claim 5
Dependent Claim
23 words
An image forming apparatus according to claim 1 or 2 wherein said image forming condition is a surface condition on said recording medium.
Claim 6
Dependent Claim
16 words
An image forming apparatus according to claim 4 wherein said surface condition is a surface potential.
Claim 7
Dependent Claim
22 words
An image forming apparatus according to claim 1 wherein said sample member has a predetermined density which is a standard white density.
Claim 8
Dependent Claim
88 words
An image forming apparatus comprising: image forming means for forming an image on a recording medium, said image forming means including exposure means for exposing said recording medium; and control means for detecting an image forming condition of said image forming means including an exposure condition and for controlling an operation condition of said exposure means based on the detected condition, wherein said control means corrects data corresponding to the control of the operation condition of said image forming means in accordance with magnification of the image formation.
Claim 9
Dependent Claim
88 words
An image forming apparatus comprising: image forming means for forming an image on a recording medium, said image forming means including exposure means for exposing said recording medium; and control means for detecting an image forming condition of said image forming means including an exposure condition and for controlling an operation condition of said exposure means based on the detected condition, wherein said control means corrects data corresponding to the control of the operation condition of said image forming means in accordance with magnification of the image formation.
Claim 10
Dependent Claim
48 words
An image forming apparatus according to claim 7 wherein said image forming means includes means for charging said recording medium, and said control means corrects the data involved in the control of the operation condition of said charging means in accordance with the magnification of the image formation.
Claim 11
Dependent Claim
34 words
An image forming apparatus according to claim 7 wherein said control means performs a regulating control of the operation condition of said image forming means in response to detection of the image forming condition.
Claim 12
Dependent Claim
45 words
An image forming apparatus according to claim 9 wherein said control means causes a light from said exposure means to be projected to a predetermined sample member, and detects the exposure condition in accordance with the quantity of the reflection light from said sample member.
Claim 13
Dependent Claim
38 words
An image forming apparatus according to claim 10 wherein said control means detects the exposure condition based on the surface condition produced on said recording in accordance with the quantity of the reflection light from said sample member.
References Cited (Backward Citations)
US4215930A
Cited
US4277162A
Cited
US4279498A
Cited
US4268165A
Cited
US4390266A
Cited
US4372676A
Cited
US4348099A
Cited
US4372672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-15 | 1988-10-15 | 1989-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-15 | 1992-10-15 | 1993-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-15 | 1996-10-15 | 1997-04-16 | $7700.00 | Window Closed / Lapsed |