US3936173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system
Assignee: Xerox Corp
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Filing: 1974-10-04
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Granted: 1976-02-03
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Expires: 1994-10-04
Abstract
Abstract An optical system in which a screened light pattern and a light image of an original document are projected onto a common region of a light receiving member forming a modulated light image thereon. Collimated light rays are employed in the formation of the screened light pattern.
Inventors
- 👤 Wayne L. Kidd
- 👤 George N. Tsilibes
- 👤 Stephen C. Urciuoli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:03
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/04027
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
An electrophotographic printing machine, including: a photoconductive member; means for charging said photoconductive member to a substantially uniform level; exposure means for forming and projecting a light image of an original document onto the charged portion of said photoconductive member recording thereon an electrostatic latent image; an electroluminescent panel extending substantially across the width of said photoconductive member; strip means having lens portions thereon transmitting substantially parallel light rays therethrough from said electroluminescent panel; and a screen member positioned closely adjacent to said photoconductive member in a light receiving relationship with the light rays transmitted through said strip means to illuminate said photoconductive member with a screened light image, the screened light image being superimposed over the electrostatic latent image recording a modulated electrostatic latent image of the original document on said photoconductive member.
Claim 2
Dependent Claim
134 words
An electrophotographic printing machine, including: a photoconductive member; means for charging said photoconductive member to a substantially uniform level; exposure means for forming and projecting a light image of an original document onto the charged portion of said photoconductive member recording thereon an electrostatic latent image; an electroluminescent panel extending substantially across the width of said photoconductive member; strip means having lens portions thereon transmitting substantially parallel light rays therethrough from said electroluminescent panel; and a screen member positioned closely adjacent to said photoconductive member in a light receiving relationship with the light rays transmitted through said strip means to illuminate said photoconductive member with a screened light image, the screened light image being superimposed over the electrostatic latent image recording a modulated electrostatic latent image of the original document on said photoconductive member.
Claim 3
Dependent Claim
29 words
A printing machine as recited in claim 1, further including means for switching said electroluminescent panel on and off at a preselected frequency to produce pulsed light rays therefrom.
Claim 4
Dependent Claim
54 words
A printing machine as recited in claim 2, wherein said exposure means includes: a light source arranged to illuminate the original document; and lens means, in a light receiving relationship with the light rays transmitted from the original document, for forming a light image thereof arranged to be projected onto said charged photoconductive surface.
Claim 5
Dependent Claim
31 words
A printing machine as recited in claim 3, wherein said exposure means includes means for filtering the light image transmitted from said lens means to form a single color light image.
Claim 6
Dependent Claim
20 words
A printing machine as recited in claim 4, wherein said screen member includes a plurality of substantially equally spaced lines.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |