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Patent US4066351A successfully refreshed from Google Patents.
US4066351A
Expired / Lapsed
US
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Variable illumination optical system
Assignee: Xerox Corp
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Filing: 1976-02-20
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Granted: 1978-01-03
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Expires: 1996-02-20
Abstract
Abstract An optical system in which a screen modulates the light produced thereby. The intensity of the light image is varied as a function of screen position.
Inventors
- 👤 Wayne L. Kidd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:59
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/043; G03G15/0435; G03G15/04027
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
153 words
An electrophotographic printing machine for reproducing an original document, including: a photoconductive member; means for charging at least a portion of said photoconductive member to a substantially uniform level; a screen member; means for adjusting the spacing between said screen member and said photoconductive member; a light source for illuminating the original document; a power supply coupled to said light source and applying an excitation voltage thereto; means, responsive to the spacing between said scren member and said photoconductive member, for controlling said power supply to regulate the voltage applied to said light source by said power supply, thereby controlling the intensity of illuminating developed by said light source; a lens is a light receiving relationship with the light rays transmitted from the original document to form a light image thereof; and means for directing the light image onto the charged portion of said photoconductive member to record an electrostatic latent image thereon.
Claim 2
Dependent Claim
153 words
An electrophotographic printing machine for reproducing an original document, including: a photoconductive member; means for charging at least a portion of said photoconductive member to a substantially uniform level; a screen member; means for adjusting the spacing between said screen member and said photoconductive member; a light source for illuminating the original document; a power supply coupled to said light source and applying an excitation voltage thereto; means, responsive to the spacing between said scren member and said photoconductive member, for controlling said power supply to regulate the voltage applied to said light source by said power supply, thereby controlling the intensity of illuminating developed by said light source; a lens is a light receiving relationship with the light rays transmitted from the original document to form a light image thereof; and means for directing the light image onto the charged portion of said photoconductive member to record an electrostatic latent image thereon.
Claim 3
Dependent Claim
28 words
A printing machine as recited in claim 1, further including means for filtering the light image transmitted through said lens to form a single color light image thereof.
Claim 4
Dependent Claim
34 words
A printing machine as recited in claim 1, wherein said controlling means includes switching means operatively associated with said power supply to set said power supply at one of a plurality of pre-selected levels.
Claim 5
Dependent Claim
62 words
A printing machine as recited in claim 3, wherein said adjusting means includes means for moving said screen member relative to said photoconductive member, said moving means locating said screen member at one of a plurality of positions relative to said photoconductive member in response to said switching means setting said power supply at one of a plurality of said pre-selected levels.
References Cited (Backward Citations)
US3120790A
Cited
US3580671A
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US3815992A
Cited
US3672759A
Cited
US3936173A
Cited
US3961848A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |