US3779639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color electrophotographic apparatus
Assignee: Fujifilm Holdings Corp
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Filing: 1971-12-30
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Granted: 1973-12-18
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Expires: 1991-12-30
Abstract
Abstract Color electrophotographic apparatus comprises a plurality of operation stations each of which has a charging section, an optical image exposure section and a developing section. Two sets of endless belts travel between the plurality of operation stations and convey a flexible electrophotographic material. The endless belts contact only the end or edge portions of the electrophotographic material. An optical system is provided wherein the optical axis for exposing the electrophotographic material is maintained in the same position in all the optical image exposure sections, the surface of the photoconductive insulating layer is perpendicular to the optical axis, and the optical images formed on the insulating layer are equal to each other in size during all exposures.
Inventors
- 👤 Y Tamai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:28
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/01; G03G15/0142; G03G15/65; G03G15/6597; G03G2215/00; G03G2215/00362; G03G2215/00443; G03G2215/00518; G03G2215/00953; G03G2215/00962; G03G2215/00966
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
173 words
A color electrophotographic apparatus comprising conveying means for sequentially conveying a sheet of electrophotographic material to at least two exposure sections disposed a predetermined distance apart; means for charging said electrophotographic sheet prior to it being conveyed to each said exposure section; means for sequentially image exposing said electrophotographic material at each of said exposure sections, said image exposing means having an optical axis along which said two exposure sections are disposed and including means for making the optical images on the surface of the electrophotographic sheet equal to one another in size at each of the exposure sections to accommodate said predetermined distance therebetween; and means for developing the latent images on said electrophotographic sheet resulting from the image exposures at said exposure, said developing occuring after each said exposure section, said sheet being conveyed by said conveying means across said optical axis in a first direction at the first of said two exposure sections and in a second direction across said optical axis at the second of said two exposure sections.
Claim 2
Dependent Claim
173 words
A color electrophotographic apparatus comprising conveying means for sequentially conveying a sheet of electrophotographic material to at least two exposure sections disposed a predetermined distance apart; means for charging said electrophotographic sheet prior to it being conveyed to each said exposure section; means for sequentially image exposing said electrophotographic material at each of said exposure sections, said image exposing means having an optical axis along which said two exposure sections are disposed and including means for making the optical images on the surface of the electrophotographic sheet equal to one another in size at each of the exposure sections to accommodate said predetermined distance therebetween; and means for developing the latent images on said electrophotographic sheet resulting from the image exposures at said exposure, said developing occuring after each said exposure section, said sheet being conveyed by said conveying means across said optical axis in a first direction at the first of said two exposure sections and in a second direction across said optical axis at the second of said two exposure sections.
Claim 3
Dependent Claim
33 words
Apparatus as in claim 1 where said means for making the optical images equal to one another includes means for moving said exposure means said predetermined distance between each of said sequential exposures.
Claim 4
Dependent Claim
58 words
Apparatus as in claim 1 where said conveying means comprises two pairs of endless belts where one pair grips one side of said sheet and the other pair grips the other side, at least a portion of said endless belts traversing a path which respectively perpendicularly crosses the optical axis of said exposure means at said exposure sections.
Claim 5
Dependent Claim
19 words
Apparatus as in claim 3 including means for moving said two pairs of endless belts at the same speed.
Claim 6
Dependent Claim
33 words
Apparatus as in claim 3 where each said pair of endless belts are separated at a point subsequent to the last developing means to permit the removal of the developed electrophotographic sheet therefrom.
Claim 7
Dependent Claim
28 words
Apparatus as in claim 1 where said exposing means includes a plurality of filters of differing colors, a different filter being introduced for each exposure for color separation.
Claim 8
Dependent Claim
31 words
Apparatus as in claim 6 where said developing means includes means for developing said latent images with colored toners, the colors of which are respectively complementary to said color separation filters.
Claim 9
Dependent Claim
14 words
Apparatus as in claim 7 where said toners are magenta, cyan, and yellow respectively.
Claim 10
Dependent Claim
15 words
Apparatus as in claim 1 where said first direction is opposite to said second direction.
Claim 11
Dependent Claim
19 words
Apparatus as in claim 1 where said conveying means includes means for gripping said sheet at each side thereof.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |