US3884686A
Expired / Lapsed
US
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Color correction method
Assignee: Xerox Corp
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Filing: 1973-10-26
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Granted: 1975-05-20
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Expires: 1993-10-26
Abstract
Abstract This invention relates to a color correction method in a xerographic process in which the free surface of a xerographic plate having an insulating overlayer is charged a first time and exposed imagewise through a first primary color filter, then charged a second time and exposed imagewise through a second primary color filter. After the second exposure, the plate is recharged and subject to a flood light to form a latent electrostatic color image. The latent image is developed by depositing on the plate an electrostatically attractable toner having a color which complements the color of the second primary color filter. The foregoing steps are repeated for all of the primary color toners to produce high fidelity facsimile color copies. The present method may be used for color copies or color separations of color originals.
Inventors
- 👤 Lloyd F Bean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:44
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/01
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
153 words
A METHOD FOR OBTAINING A COLOR CORRECTED ELECROSTATIC LATENT IMAGE COMPRISING THE STEPS OF: A. PROVIDING A XEROGRAPHIC MEMBER COMPRISING AN ELECTRICALLY INSULATING LAYER OVERLYING A PHOTOCONDUCTIVE INSULATING LAYER WHICH OVERLIES A CONDUCTIVE SUBSTRATE, B. APPLYING A FIRST ELECTROSTATIC CHARGE TO SAID MEMBER, C. IMAGEWISE EXPOSING SAID MEMBER TO AN ORIGINAL COLOR IMAGE THROUGH A FILTER OF A FIRST PRIMARY COLOR, D. APPLYING A SECOND ELECTROSTATIC CHARGE TO SAID MEMBER, SAID SECOND CHARGE HAVING A POLARITY OPPOSITE TO THAT OF SAID FIRST CHARGE, E. IMAGEWISE EXPOSING SAID MEMBER TO SAID ORIGINAL COLOR IMAGE THROUGH A FILTER OF A SECOND PRIMARY COLOR, SAID SECOND PRIMARY COLOR BEING COMPLEMENTARY TO THE COLOR INFORMATION OF SAID ORIGINAL IMAGE WHICH IS REPRESENTED BY THE ELECTROSTATIC LATENT IMAGE BEING FORMED, F. APPLYING A THIRD ELECTROSATIC CHARGE TO SAID MEMBER, AND G. FLOOD EXPOSING SAID MEMBER WHEREBY THERE IS FORMED A COLOR CORRECTED ELECTROSATIC LATENT IMAGE ON SAID MEMBER.
Claim 2
Independent Claim
153 words
A METHOD FOR OBTAINING A COLOR CORRECTED ELECROSTATIC LATENT IMAGE COMPRISING THE STEPS OF: A. PROVIDING A XEROGRAPHIC MEMBER COMPRISING AN ELECTRICALLY INSULATING LAYER OVERLYING A PHOTOCONDUCTIVE INSULATING LAYER WHICH OVERLIES A CONDUCTIVE SUBSTRATE, B. APPLYING A FIRST ELECTROSTATIC CHARGE TO SAID MEMBER, C. IMAGEWISE EXPOSING SAID MEMBER TO AN ORIGINAL COLOR IMAGE THROUGH A FILTER OF A FIRST PRIMARY COLOR, D. APPLYING A SECOND ELECTROSTATIC CHARGE TO SAID MEMBER, SAID SECOND CHARGE HAVING A POLARITY OPPOSITE TO THAT OF SAID FIRST CHARGE, E. IMAGEWISE EXPOSING SAID MEMBER TO SAID ORIGINAL COLOR IMAGE THROUGH A FILTER OF A SECOND PRIMARY COLOR, SAID SECOND PRIMARY COLOR BEING COMPLEMENTARY TO THE COLOR INFORMATION OF SAID ORIGINAL IMAGE WHICH IS REPRESENTED BY THE ELECTROSTATIC LATENT IMAGE BEING FORMED, F. APPLYING A THIRD ELECTROSATIC CHARGE TO SAID MEMBER, AND G. FLOOD EXPOSING SAID MEMBER WHEREBY THERE IS FORMED A COLOR CORRECTED ELECTROSATIC LATENT IMAGE ON SAID MEMBER.
Claim 3
Dependent Claim
15 words
The method as defined in claim 1 wherein steps (b) and (c) are performed simultaneously.
Claim 4
Dependent Claim
15 words
The method as defined in claim 2 wherein steps (d) and (e) are performed simultaneously.
Claim 5
Dependent Claim
38 words
The method as defined in claim 1 and further including the step of: h. developing said electrostatic latent image on said member with a toner having a color which is complementary to that of said second primary color.
Claim 6
Dependent Claim
22 words
The method as defined in claim 4 and further including the step of: i. transferring said developed image to a receiver member.
Claim 7
Dependent Claim
40 words
The method as defined in claim 4 and further including performing steps (b)-(h) at least one additional time to form in register on said member at least one additional visible image of another primary color present in said original image.
Claim 8
Dependent Claim
22 words
The method as defined in claim 6 and further including the step of: i. transferring said developed images to a receiver member.
Claim 9
Dependent Claim
22 words
The method as defined in claim 7 and further including the step of: j. fixing said developed image to said receiver member.
Claim 10
Dependent Claim
36 words
The method as defined in claim 8 wherein there are formed in register on said member and transferred to said receiver member visible images of the yellow, magenta, and cyan areas, respectively of said original image.
Claim 11
Dependent Claim
31 words
The method as defined in claim 1 wherein said imagewise exposures are to a color negative of an original image through primary color lenses in place of said primary color filters.
Claim 12
Dependent Claim
56 words
The method as defined in claim 1 and further including the steps of: h. developing said electrostatic latent image with an oleophilic toner having a color which is complementary to that of said second primary color; i. transferring said developed image to a hydrophilic receiver member; and j. fixing said developed image to said receiver member.
Claim 13
Independent Claim
198 words
A method for obtaining a color corrected electrostatic latent image comprising the steps of: a. providing a xerographic member comprising an electrically insulating layer overlying a photoconductive insulating layer which overlies a conductive substrate; b. applying a first electrostatic charge to said member; c. imagewise exposing said member to an original color image throuGh a filter of a first primary color; d. applying a second electrostatic charge to said member, said second charge having a polarity the same at that of said first charge; e. imagewise exposing said member to said original color image through a filter of a second primary color; f. applying a third electrostatic charge to said member, said third charge having a polarity which is opposite to that of said first and second charges; g. imagewise exposing said member to said original color image through a filter of a third prmary color, said third primary color being complementary to the color information of said original image which is represented by the electrostatic latent image being formed; h. applying a fourth electrostatic charge to said member, and i. flood exposing said member whereby there is formed a color corrected electrostatic latent image on said member.
Claim 14
Independent Claim
198 words
A method for obtaining a color corrected electrostatic latent image comprising the steps of: a. providing a xerographic member comprising an electrically insulating layer overlying a photoconductive insulating layer which overlies a conductive substrate; b. applying a first electrostatic charge to said member; c. imagewise exposing said member to an original color image throuGh a filter of a first primary color; d. applying a second electrostatic charge to said member, said second charge having a polarity the same at that of said first charge; e. imagewise exposing said member to said original color image through a filter of a second primary color; f. applying a third electrostatic charge to said member, said third charge having a polarity which is opposite to that of said first and second charges; g. imagewise exposing said member to said original color image through a filter of a third prmary color, said third primary color being complementary to the color information of said original image which is represented by the electrostatic latent image being formed; h. applying a fourth electrostatic charge to said member, and i. flood exposing said member whereby there is formed a color corrected electrostatic latent image on said member.
Claim 15
Dependent Claim
15 words
The method as defined in claim 12 wherein steps (b) and (c) are performed simultaneously.
Claim 16
Dependent Claim
15 words
The method as defined in claim 13 wherein steps (d) and (e) are performed simultaneously.
Claim 17
Dependent Claim
15 words
The method as defined in claim 14 wherein steps (f) and (g) are performed simultaneously.
Claim 18
Dependent Claim
38 words
The method as defined in claim 12 and further including the step of: j. developing said electrostatic latent image on said member with a toner having a color which is complementary to that of said third primary color.
Claim 19
Dependent Claim
22 words
The method as defined in claim 16 and further including the step of: k. transferring said developed image to a receiver member.
Claim 20
Dependent Claim
34 words
The method as defined in claim 16 wherein said first primary color filter is green, said second primary color filter is red, said third primary color filter is blue and said toner is yellow.
Claim 21
Dependent Claim
149 words
The method as defined in claim 18 and further including forming in register on said member a visible image of the magenta areas of said original image by the steps of: applying a first electrostatic charge to said member; imagewise exposing said member to said original image through a red filter; applying a second electrostatic charge to said member, said second charge having the same polarity as that of said first charge; imagewise exposing said member to said original image through a blue filter; applying a third electrostatic charge to said member, said third charge having a polarity opposite to that of said first and second charges; imagewise exposing said member to said original image through a green filter; applying a fourth electrostatic charge to said member; flood exposing said member whereby an electrostatic latent image is formed; and developing said electrostatic latent image with a magenta colored toner.
Claim 22
Dependent Claim
150 words
The method as defined in claim 19 and further including forming in register on said member a visible image corresponding to the cyan areas of said original image by the steps of: applying a first electrostatic charge to said member; imagewise exposing said member to said original image through a blue filter; applying a second electrostatic charge to said member, said second charge having the same polarity as that of said first charge; imagewise exposing said member to said original image through a green filter; applying a third electrostatic charge to said member, said third charge having a polarity opposite to that of said first and second charges; imagewise exposing said member to said original image through a red filter; applying a fourth electrostatic charge to said member; flood exposing said member whereby an electrostatic latent image is formed; and developing said electrostatic latent image with a cyan colored toner.
Claim 23
Dependent Claim
30 words
The method as defined in claim 20 and further including the steps of: transferring said developed images to a receiver member and fixing said developed image to said receiver member.
Claim 24
Dependent Claim
34 words
The method as defined in claim 16 wherein said first primary color filter is red, said second primary cOlor filter is blue, said third primary color filter is green and said toner is magenta.
Claim 25
Dependent Claim
34 words
The method as defined in claim 16 wherein said first primary color filter is blue, said second primary color filter is green, said third primary color filter is red and said toner is cyan.
References Cited (Backward Citations)
US2986466A
Cited
US3043686A
Cited
US3057720A
Cited
US3420662A
Cited
US3615391A
Cited
US3692519A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |