US4027962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color transparency reproducing machine
Assignee: Xerox Corp
•
Filing: 1975-01-13
•
Granted: 1977-06-07
•
Expires: 1995-01-13
Abstract
Abstract An electrophotographic printing machine in which color transparencies are reproduced. A projected image of the color transparency is scanned forming a light image thereof. The light image is modulated and filtered creating a single color half-tone light image. A charged photoconductive member is irradiated by the single color half-tone light image recording a single color electrostatic latent image thereon.
Inventors
- 👤 Louis D. Mailloux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:53
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/01; G03G15/0105; G03G15/011; G03G15/0115
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
128 words
An electrophotographic printing machine for reproducing a transparency, including: a photoconductive member; means for charging at least a portion of said photoconductive member; a composition frame; a platen having said composition frame disposed thereon; means for projecting a light image of the transparency onto said platen; a screen member disposed on said platen for modulating the light image of the transparency projected onto said platen to form a half-tone light image thereof; and means for exposing the charged portion of said photoconductive member to a light image of said composition frame and the half-tone light image of the transparency to record on said photoconductive member a combined electrostatic latent image comprising the electrostatic latent half-tone image of the transparency and the electrostatic latent image of said composition frame.
Claim 2
Dependent Claim
128 words
An electrophotographic printing machine for reproducing a transparency, including: a photoconductive member; means for charging at least a portion of said photoconductive member; a composition frame; a platen having said composition frame disposed thereon; means for projecting a light image of the transparency onto said platen; a screen member disposed on said platen for modulating the light image of the transparency projected onto said platen to form a half-tone light image thereof; and means for exposing the charged portion of said photoconductive member to a light image of said composition frame and the half-tone light image of the transparency to record on said photoconductive member a combined electrostatic latent image comprising the electrostatic latent half-tone image of the transparency and the electrostatic latent image of said composition frame.
Claim 3
Dependent Claim
45 words
A printing machine as recited in claim 1, further including means for filtering the half-tone light image of the transparency to form a single color light image which irradiates the charged portion of said photoconductive member to record thereon a single color electrostatic latent image.
Claim 4
Dependent Claim
74 words
A printing machine as recited in claim 2, further including: means for developing the single color electrostatic latent image recorded on said photoconductive member with toner powder complementary in color to the single color light image; means for transferring the toner powder image adhering to the electrostatic latent image recorded on said photoconductive member to a sheet of support material; and means for fusing the toner powder image to the sheet of support material.
Claim 5
Dependent Claim
32 words
A printing machine as recited in claim 3, wherein said projecting means includes a slide projector positioned on the printing machine and adapted to project an image of the transparency disposed therein.
Claim 6
Dependent Claim
18 words
A printing machine as recited in claim 4, further including a Fresnel lens mounted on said composition frame.
Claim 7
Dependent Claim
25 words
A printing machine as recited in claim 5, wherein said screen member includes a dot screen interposed between said Fresnel lens and said composition frame.
Claim 8
Dependent Claim
17 words
A printing machine as recited in claim 6, wherein said dot screen includes soft gray square dots.
Claim 9
Dependent Claim
18 words
A printing machine as recited in claim 7, wherein said dot screen preferably includes 85 dots per inch.
Claim 10
Dependent Claim
18 words
A printing machine as recited in claim 8, wherein said Fresnel lens preferably includes 200 gratings per inch.
Claim 11
Dependent Claim
43 words
A printing machine as recited in claim 3, wherein said exposing means includes: a light source arranged to illuminate said composition frame on said platen; and lens means for receiving the light rays from said composition frame to form a light image thereof.
Claim 12
Dependent Claim
71 words
A printing machine as recited in claim 10, wherein said filtering means includes: a red filter adapted to be interposed into the light image path to transmit a red light image therethrough; a blue filter adapted to be interposed into the light image path to transmit a blue light image therethrough; and a green filter adapted to be interposed into the light image path to transmit a green light image therethrough.
References Cited (Backward Citations)
US3357830A
Cited
US3292486A
Cited
US3152528A
Cited
US3439983A
Cited
US3542468A
Cited
US3547533A
Cited
US3517596A
Cited
US3833293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |