← Back to Patent Explorer
US3844783A Expired / Lapsed US ⏱️ 0.0 years remaining

Electrophotographic process including a color masking operation

Assignee: Fujifilm Holdings Corp
•
Filing: 1971-12-28
•
Granted: 1974-10-29
•
Expires: 1991-12-28
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract An electrophotographic process including a color masking operation comprising providing a photoconductive insulator as a main photosensitive element and a substantially transparent photoconductive insulator as a transparent photosensitive element, where the main photosensitive element is provided with a grounded conductive support and the transparent photosensitive element is provided with a transparent grounded conductive support and where the spectrum sensitivity region of the transparent photosensitive element is different from the spectrum sensitivity region of the main photosensitive element or the main photosensitive element combined with a colored filter, charging both photosensitive elements with the same polarity, facing the charged surfaces of both the photosensitive elements toward each other so that a slight gap exists therebetween (1) with the colored filter interposed and/or a substantially transparent insulator interposed, or (2) with nothing interposed, image exposing while both the photosensitive elements are held in registry from the side of the transparent photosensitive element to obtain the electrostatic latent images of reflected image relation on the main photosensitive element and the transparent photosensitive element, and developing the latent image on the main photosensitive element while maintaining the registry between both the photosensitive elements, the amount of toner deposited being influenced by the latent image on the transparent photosensitive element.

Inventors

  • 👤 S Matsumoto
  • 👤 I Takahashi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 00:25
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/01

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 204 words
AN ELECTROPHOTOGRAPHIC PROCESS INCLUDING A COLOR MASKING OPERATION COMPRISING PROVIDING A PHOTOCONDUCTIVE INSULATOR AS A MAIN PHOTOSENSITIVE ELEMENT AND A SUBSTANTIALLY TRANSPARENT PHOTOCONDUCTIVE INSULATOR AS A TRANSPARENT PHOTOSENSITIVE ELEMENT, WHERE SAID MAIN PHOTOSENSITIVE ELEMENT IS PROVIDED WITH A GROUNDED CONDUCTIVE SUPPORT AND SAID TRANSPARENT PHOTOSENSITIVE ELEMENT IS PROVIDED WITH A TRANSPARENT GROUNDED CONDUCTIVE SUPPORT AND WHERE THE SPECTRUM SENSITIVITY REGION OF SAID TRANSPARENT PHOTOSENSITIVE ELEMENT DIFFERENT FROM THE SPECTRUM SENSITIVITY REGION OF SAID MAIN PHOTOSENSITIVE ELEMENT OR SAID MAIN PHOTOSENSITIVE ELEMENT COMBINED WITH A COLORED FILTER, CHARGING BOTH PHOTOSENSITIVE ELEMENTS WITH THE SAME POLARITY, FACING THE CHARGED SURFACES OF BOTH SAID PHOTOSENSITIVE ELEMENTS TOWARD EACH OTHER SO THAT A SLIGHT GAP EXISTS THEREBETWEEN (1) WITH SAID COLORED FILTER INTERPOSED AND/OR A SUBSTANTIALLY TRANSPARENT INSULATOR INTERPOSED, OR (2) WITH NOTHING INTERPOSED, IMAGE EXPOSING WHILE BOTH SAID PHOTOSENSITIVE ELEMENTS ARE HELD IN REGISTRY FROM THE SIDE OF SAID TRANSPARENT PHOTOSENSITIVE ELEMENTS TO OBTAIN THE ELECTROSTATIC LATENT IMAGES OF REFLECTED IMAGE RELATION ON SAID MAIN PHOTOSENSITIVE ELEMENT AND SAID TRANSPARENT PHOTOSENSITIVE ELEMENT, AND DEVELOPING THE LATENT IMAGE ON SAID MAIN PHOTOSENSITIVE ELEMENT WHILE MAINTAINING SAID REGISTRY BEBTWEEN BOTH SAID PHOTOSENSITIVE ELEMENTS, THE AMOUNT OF TONER DEPOSITED BEING INFLUENCED BY THE LATENT IMAGE ON SAID TRANSPARENT PHOTOSENSITIVE ELEMENT.
Claim 2
Dependent Claim 204 words
AN ELECTROPHOTOGRAPHIC PROCESS INCLUDING A COLOR MASKING OPERATION COMPRISING PROVIDING A PHOTOCONDUCTIVE INSULATOR AS A MAIN PHOTOSENSITIVE ELEMENT AND A SUBSTANTIALLY TRANSPARENT PHOTOCONDUCTIVE INSULATOR AS A TRANSPARENT PHOTOSENSITIVE ELEMENT, WHERE SAID MAIN PHOTOSENSITIVE ELEMENT IS PROVIDED WITH A GROUNDED CONDUCTIVE SUPPORT AND SAID TRANSPARENT PHOTOSENSITIVE ELEMENT IS PROVIDED WITH A TRANSPARENT GROUNDED CONDUCTIVE SUPPORT AND WHERE THE SPECTRUM SENSITIVITY REGION OF SAID TRANSPARENT PHOTOSENSITIVE ELEMENT DIFFERENT FROM THE SPECTRUM SENSITIVITY REGION OF SAID MAIN PHOTOSENSITIVE ELEMENT OR SAID MAIN PHOTOSENSITIVE ELEMENT COMBINED WITH A COLORED FILTER, CHARGING BOTH PHOTOSENSITIVE ELEMENTS WITH THE SAME POLARITY, FACING THE CHARGED SURFACES OF BOTH SAID PHOTOSENSITIVE ELEMENTS TOWARD EACH OTHER SO THAT A SLIGHT GAP EXISTS THEREBETWEEN (1) WITH SAID COLORED FILTER INTERPOSED AND/OR A SUBSTANTIALLY TRANSPARENT INSULATOR INTERPOSED, OR (2) WITH NOTHING INTERPOSED, IMAGE EXPOSING WHILE BOTH SAID PHOTOSENSITIVE ELEMENTS ARE HELD IN REGISTRY FROM THE SIDE OF SAID TRANSPARENT PHOTOSENSITIVE ELEMENTS TO OBTAIN THE ELECTROSTATIC LATENT IMAGES OF REFLECTED IMAGE RELATION ON SAID MAIN PHOTOSENSITIVE ELEMENT AND SAID TRANSPARENT PHOTOSENSITIVE ELEMENT, AND DEVELOPING THE LATENT IMAGE ON SAID MAIN PHOTOSENSITIVE ELEMENT WHILE MAINTAINING SAID REGISTRY BEBTWEEN BOTH SAID PHOTOSENSITIVE ELEMENTS, THE AMOUNT OF TONER DEPOSITED BEING INFLUENCED BY THE LATENT IMAGE ON SAID TRANSPARENT PHOTOSENSITIVE ELEMENT.
Claim 3
Dependent Claim 29 words
An electrophotographic process as in claim 1 where said main photosensitive element is panchromatic and blue, green, and red filters are used respectively to effect a subtractive color process.
Claim 4
Dependent Claim 35 words
An electrophotographic process as in claim 1 where said main photoconductive material is panchromatic and a red filter is used, said transparent photoconductive material is green sensitive, and the color of the toner is cyan.
Claim 5
Dependent Claim 35 words
An electrophotographic process as in claim 1 where said main photoconductive material is panchromatic and a green filter is used, said transparent photoconductive material is red sensitive, and the color of the toner is magenta.
Claim 6
Dependent Claim 37 words
An electrophotographic process as in claim 1 where said main photoconductive material is panchromatic and a blue filter is used, said transparent photoconductive material is red and green sensitive, and the color of the toner is yellow.
Claim 7
Dependent Claim 26 words
An electrophotographic process as in claim 1 where said toner is of the same polarity as that of said latent images whereby reversal development is effected.
Claim 8
Dependent Claim 25 words
An electrophotographic process as in claim 1 where the polarity of said toner is opposite to that of said latent images to effect positive development.

References Cited (Backward Citations)

US2808328A Cited
US2986466A Cited
US2962374A Cited
US2962375A Cited
US3043686A Cited
US3057720A Cited
US3620798A Cited
NL6812120A Cited
US3615391A Cited
US3687661A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-10-28 1978-04-29 1978-10-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-10-28 1982-04-29 1982-10-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-10-28 1986-04-29 1986-10-29 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag