Patent US5214474A successfully refreshed from Google Patents.
US5214474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copying apparatus
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1992-03-26
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Granted: 1993-05-25
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Expires: 2012-03-26
Abstract
Abstract The intensity of a light emitted from a light source and reflected on a document is detected by an exposure sensor. A control section controls an exposure adjusting circuit to adjust an intensity of the light emitted from the light source based on a detection result of the exposure sensor, and simultaneously controls a potential adjusting circuit to adjust a potential of a surface of a photoconductive drum through a charging device.
Inventors
- 👤 Yoshiyuki Ishizuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:22
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/043; G03G15/02; G03G15/0266
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
233 words
A copying apparatus, comprising: a photoconductive drum; a charging device for charging the photoconductive drum; a light source for emitting a light to expose a document; a lens unit, through which light reflected on the document is transmitted to expose the photoconductive drum charged by the charging device to form an electrostatic latent image on the photoconductive drum; a developing device for developing the electrostatic latent image; exposure adjusting means for adjusting an exposure of the photoconductive drum to the light emitted from the light source and reflected on the document by changing an intensity of the light emitted from the light source; potential adjusting means for adjusting a potential of the photoconductive drum through the charging device; and control means for controlling the exposure adjusting means to adjust the exposure and simultaneously controlling the potential adjusting means to adjust the potential, based on the intensity of the light emitted from the light source and reflected on the document, wherein the exposure adjusting means is controlled to heighten the exposure and the potential adjusting means is controlled to lower the potential in the case that the intensity of the light is lower than a reference value, and the exposure adjusting means is controlled to lower the exposure and the potential adjusting means is controlled to heighten the potential in the case that the intensity of the light is higher than the reference value.
Claim 2
Dependent Claim
233 words
A copying apparatus, comprising: a photoconductive drum; a charging device for charging the photoconductive drum; a light source for emitting a light to expose a document; a lens unit, through which light reflected on the document is transmitted to expose the photoconductive drum charged by the charging device to form an electrostatic latent image on the photoconductive drum; a developing device for developing the electrostatic latent image; exposure adjusting means for adjusting an exposure of the photoconductive drum to the light emitted from the light source and reflected on the document by changing an intensity of the light emitted from the light source; potential adjusting means for adjusting a potential of the photoconductive drum through the charging device; and control means for controlling the exposure adjusting means to adjust the exposure and simultaneously controlling the potential adjusting means to adjust the potential, based on the intensity of the light emitted from the light source and reflected on the document, wherein the exposure adjusting means is controlled to heighten the exposure and the potential adjusting means is controlled to lower the potential in the case that the intensity of the light is lower than a reference value, and the exposure adjusting means is controlled to lower the exposure and the potential adjusting means is controlled to heighten the potential in the case that the intensity of the light is higher than the reference value.
Claim 3
Dependent Claim
26 words
A copying apparatus according to claim 1, wherein the lens unit has a red filter, through which the light for exposing the photoconductive drum is transmitted.
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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) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |