US4618246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming device
Assignee: Canon Inc
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Filing: 1985-11-06
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Granted: 1986-10-21
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Expires: 2005-11-06
Abstract
Abstract An image forming device constracted with an image forming device, a memory device to store therein a plurality of programs for stable control of an image quality, and a device for selecting and executing one of the programs stored in the memory device. The image forming device is further provided with a humidity detection device, a temperature control device, and a control device to effect potential control.
Inventors
- 👤 Nao Nagashima
- 👤 Koji Suzuki
- 👤 Jyoji Nagahira
- 👤 Kouki Kuroda
- 👤 Yoshiaki Takayanagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:21
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0266; G03G15/04; G03G15/045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
152 words
An image forming apparatus comprising: (a) image forming means for forming an image on a recording member, said image forming means including means for forming the image with different magnifications, (b) a first control means for detecting an image formation condition and for controlling said image forming means based on the detected condition to form an adequate image, said first control means having a digital memory storing a plurality of control parameters for use in control of said image forming means, and (c) a second control means for controlling said first control means to provide a different control condition for said image forming means in accordance with the magnification, wherein said second control means selects a desired one among said plurality of control parameters in accordance with the magnification, and said first control means controls said image forming means in accordance with the detected image formation condition and the selected control parameter.
Claim 2
Dependent Claim
152 words
An image forming apparatus comprising: (a) image forming means for forming an image on a recording member, said image forming means including means for forming the image with different magnifications, (b) a first control means for detecting an image formation condition and for controlling said image forming means based on the detected condition to form an adequate image, said first control means having a digital memory storing a plurality of control parameters for use in control of said image forming means, and (c) a second control means for controlling said first control means to provide a different control condition for said image forming means in accordance with the magnification, wherein said second control means selects a desired one among said plurality of control parameters in accordance with the magnification, and said first control means controls said image forming means in accordance with the detected image formation condition and the selected control parameter.
Claim 3
Dependent Claim
62 words
An image forming apparatus according to claim 1, wherein said first control means includes detecting means for detecting a surface condition of said recording member, said control parameters each being a target value of said surface condition, and said first control means controls the surface condition to converge on a predetermined target value in accordance with the output of said detecting means.
Claim 4
Dependent Claim
26 words
An image forming apparatus according to claim 2, wherein in accordance with the magnification, the target value for the surface condition to be converged is varied.
Claim 5
Dependent Claim
16 words
An image forming apparatus according to claim 2, wherein said surface condition is a surface potential.
Claim 6
Dependent Claim
24 words
An image forming apparatus according to claim 4, wherein said surface potential is a potential associated with a dark portion and a light portion.
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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) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |