US3799666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming white frame in electrophotography
Assignee: Individual
•
Filing: 1973-02-28
•
Granted: 1974-03-26
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Expires: 1993-02-28
Abstract
Abstract Electrophotographic apparatus having an exposure device for producing a white frame border about an electrostatic latent image. The apparatus comprises a plurality of internal channel members surrounding the exposure light source which open downwardly onto the copy sheet. The channel members contain a plurality of light sources for projecting light onto the perimetric portions of the copy sheet in partially overlapping relation to the electrostatic latent image for completely dissipating the charge about the electrostatic latent image so that no black border appears about the electrostatic latent image after toner development.
Inventors
- 👤 S Matsumoto
- 👤 M Sato
- 👤 O Fukushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:51
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/045; G03G15/047; G03G2215/00; G03G2215/04; G03G2215/0429; G03G2215/0431; G03G2215/0448
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
166 words
An electrophotographic apparatus comprising: means for projecting a light image from an original sheet onto a copy sheet having an uniformly electrically charged photoconductive layer to form an electrostatic latent image thereon; means for fixedly supporting a copy sheet having an uniformly electrically charged photoconductive layer to form an electrostatic latent image thereon; means for fixedly supporting a copy sheet having an uniformly electrically charged photoconductive layer in a fixed position in alignment with said projection means during formation of the electrostatic latent image; and exposure means for forming a white frame border about the electrostatic latent image, said exposure means comprising frame forming means adjacent said projection means for projecting light onto a perimetric portion of the charged photoconductive layer in partially overlapping relation to the electrostatic latent image while the copy sheet remains at said fixed position for completely dissipating the charge abouT the electrostatic latent image so that no black border appears about the electrostatic latent image after the image is toner developed.
Claim 2
Dependent Claim
166 words
An electrophotographic apparatus comprising: means for projecting a light image from an original sheet onto a copy sheet having an uniformly electrically charged photoconductive layer to form an electrostatic latent image thereon; means for fixedly supporting a copy sheet having an uniformly electrically charged photoconductive layer to form an electrostatic latent image thereon; means for fixedly supporting a copy sheet having an uniformly electrically charged photoconductive layer in a fixed position in alignment with said projection means during formation of the electrostatic latent image; and exposure means for forming a white frame border about the electrostatic latent image, said exposure means comprising frame forming means adjacent said projection means for projecting light onto a perimetric portion of the charged photoconductive layer in partially overlapping relation to the electrostatic latent image while the copy sheet remains at said fixed position for completely dissipating the charge abouT the electrostatic latent image so that no black border appears about the electrostatic latent image after the image is toner developed.
Claim 3
Dependent Claim
55 words
Apparatus as in claim 1 where said frame forming means comprises a plurality of internal channel members opening downwardly onto the charged photoconductive layer, said channel members surrounding said projection means with the opening thereof disposed adjacent portions of the charged photoconductive layer and a plurality of light sources respectively disposed within said channel members.
Claim 4
Dependent Claim
26 words
Apparatus as in claim 2 where the distance between the openings in said channel members and the charged photoconductive layer is not more than 20 millimeters.
Claim 5
Dependent Claim
24 words
Apparatus as in claim 3 where each said channel member includes means for directing the light therefrom substantially perpendicularly onto the charged photoconductive layer.
Claim 6
Dependent Claim
30 words
Apparatus as in claim 1 wherein said projection means and said frame forming means simultaneously project the light image and the frame forming light on the uniformly charged photoconductive layer.
References Cited (Backward Citations)
US3556655A
Cited
US3671121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |