US3914049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical scanning system
Assignee: Xerox Corp
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Filing: 1974-05-20
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Granted: 1975-10-21
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Expires: 1994-05-20
Abstract
Abstract A photocopying optical system in which an object is scanned and imaged through an aperture on a photoreceptor surface. A photodetector is disposed adjacent to the aperture to receive light propagating from the object and from adjacent platen area exposed by the object. The photodetector senses the level of irradiance of the object and this signal is fed back to control the intensity of the light source. A platen cover is configured to reflect light at an angle from the normal to the platen so as to avoid reflecting directly at the photodetector.
Inventors
- 👤 Samir K Basu
- 👤 Roger D Masham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:00
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/043; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/525; G03B27/526
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
An optical system for projecting an image of an object to be copied including: object illuminating means to illuminate said object at an object surface, means to project an image of said object along an optical path to an image surface, a light intensity detector disposed adjacent to said optical path and in optical communication with said object, a cover disposable over said object, on the side thereof opposite said illuminating means and said light intensity detector, and configured to reflect light from said illuminating means in direction other than toward said light intensity detector.
Claim 2
Dependent Claim
95 words
An optical system for projecting an image of an object to be copied including: object illuminating means to illuminate said object at an object surface, means to project an image of said object along an optical path to an image surface, a light intensity detector disposed adjacent to said optical path and in optical communication with said object, a cover disposable over said object, on the side thereof opposite said illuminating means and said light intensity detector, and configured to reflect light from said illuminating means in direction other than toward said light intensity detector.
Claim 3
Dependent Claim
125 words
An optical system for projecting an image of an object to be copied including: object illuminating means to illuminate said object at an object surface, means to project an image of said object along an optical path to an image surface, a light intensity detector disposed adjacent to said optical path and in optical communication with said object, a reflective cover disposable over said object, on the side thereof opposite said illuminating means and said light intensity detector, and having a reflective surface disposed te reflect light from said illuminating means at an angle to the normal to said object surface so that light from said illuminating means reflected by said reflective cover propagates in direction different from that of light reflected by said object.
Claim 4
Dependent Claim
125 words
An optical system for projecting an image of an object to be copied including: object illuminating means to illuminate said object at an object surface, means to project an image of said object along an optical path to an image surface, a light intensity detector disposed adjacent to said optical path and in optical communication with said object, a reflective cover disposable over said object, on the side thereof opposite said illuminating means and said light intensity detector, and having a reflective surface disposed te reflect light from said illuminating means at an angle to the normal to said object surface so that light from said illuminating means reflected by said reflective cover propagates in direction different from that of light reflected by said object.
Claim 5
Dependent Claim
23 words
An optical system as claimed in claim 2 in which said reflective cover includes a plurality of juxtaposed parallel and offset reflective surfaces.
Claim 6
Dependent Claim
25 words
An optical system as claimed in claim 2 in which said reflective cover includes a reflective surface which is curved relative to said object surface.
References Cited (Backward Citations)
US3020801A
Cited
US2853921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |