US3871878A
Expired / Lapsed
US
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Electrophotographic or xerographic method for treating a picture image
Assignee: Minolta Co Ltd
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Filing: 1973-05-02
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Granted: 1975-03-18
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Expires: 1993-05-02
Abstract
Abstract An electrophotographic method for treating a picture includes the steps of charging a substrate at a first polarity, projecting an image of an original on the charged substrate to produce an electrostatic latent image, imparting a uniform charge of opposite polarity to the image bearing substrate to reverse the polarity of the electrostatic latent primary image and projecting a secondary image of an original on the reversed polarity image bearing substrate to produce a resultant image which is then developed. The primary and secondary images may be of different originals to produce resultant images of additive or reductive portions permitting the simple examination of the differences between the originals, the images may be offset images of the same original to provide relief pictures, or they may be focussed and defocussed images of the same original to emphasize fine details. The charge reversal is obtained by exposing the primary image bearing substrate to a constant current corona or to a uniformly charged superimposed dielectric member.
Inventors
- 👤 Masayuki Mino
- 👤 Kuniki Seino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:33
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/22
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
77 words
THE METHOD OF PRODUCING A COMPOSITE PICTURE COMPRISING THE STEPS OF PRODUCING A REVERSED ELECTROSTATIC LATENT PRIMARY IMAGE ON A SUBSTRATE BY FORMING SAID PRIMARY IMAGE AT A PREDETERMINED POLARITY ON SAID SUBSTRATE AND THEREAFTER REVERSING THE POLARITY OF SAID FIRST LATENT IMAGE, DIRECTING ON SAID LATENT IMAGE CARRYING SUBSTRATE A SECONDARY IMAGE TO PRODUCE A RESULTANT LATENT ELECTROSTATIC IMAGE WHICH IS A FUNCTION OF SAID PRIMARY AND SECONDARY IMAGES AND DEVELOPING SAID RESULTANT LATENT ELECTROSTATIC IMAGE.
Claim 2
Independent Claim
77 words
THE METHOD OF PRODUCING A COMPOSITE PICTURE COMPRISING THE STEPS OF PRODUCING A REVERSED ELECTROSTATIC LATENT PRIMARY IMAGE ON A SUBSTRATE BY FORMING SAID PRIMARY IMAGE AT A PREDETERMINED POLARITY ON SAID SUBSTRATE AND THEREAFTER REVERSING THE POLARITY OF SAID FIRST LATENT IMAGE, DIRECTING ON SAID LATENT IMAGE CARRYING SUBSTRATE A SECONDARY IMAGE TO PRODUCE A RESULTANT LATENT ELECTROSTATIC IMAGE WHICH IS A FUNCTION OF SAID PRIMARY AND SECONDARY IMAGES AND DEVELOPING SAID RESULTANT LATENT ELECTROSTATIC IMAGE.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein the polarity of said first latent image is reversed by imparting a uniformly distributed charge of opposite polarity to said image carrying substrate.
Claim 4
Dependent Claim
16 words
The method of claim 2 wherein primary and secondary images are different and in overlapping condition.
Claim 5
Dependent Claim
20 words
The method of claim 2 wherein said primary and secondary images are similar and are offset relative to each other.
Claim 6
Dependent Claim
33 words
The method of claim 2 wherein one of said primary and secondary images comprises the defocussed image of an original and the other of said images comprises the focussed image of said original.
Claim 7
Dependent Claim
40 words
The method of claim 1 wherein said primary image polarity is reversed by exposing said primary image carrying substrate to a constant current corona discharge uniformly over the area of said substrate at a polarity opposite to said predetermined polariTy.
Claim 8
Dependent Claim
36 words
The method of claim 1 wherein said primary image polarity is reversed by superimposing on said primary image carrying substrate a dielectric member carrying a uniformly distributed charge of a polarity opposite to said predetermined polarity.
Claim 9
Independent Claim
98 words
A method for treating a picture image by electrophotography comprising the steps of; forming an electrostatic latent image of a specific polarity corresponding to a given image on an electrophotographic sensitive member chargeable to a positive or negative polarity; reversing said electrostatic latent image by imparting thereto a uniform charging at an opposite polarity to said latent image; irradiating an image variant or displaced from the given image with respect to the reversed electrostatic latent image, for reducing the initial picture image therefrom; and, subjecting said electrostatic latent image to development, thereby producing a modified electrostatic latent image.
Claim 10
Independent Claim
98 words
A method for treating a picture image by electrophotography comprising the steps of; forming an electrostatic latent image of a specific polarity corresponding to a given image on an electrophotographic sensitive member chargeable to a positive or negative polarity; reversing said electrostatic latent image by imparting thereto a uniform charging at an opposite polarity to said latent image; irradiating an image variant or displaced from the given image with respect to the reversed electrostatic latent image, for reducing the initial picture image therefrom; and, subjecting said electrostatic latent image to development, thereby producing a modified electrostatic latent image.
Claim 11
Independent Claim
130 words
A method for treating a picture image by electrophotography comprising the steps of; forming an electrostatic latent primary image of a specific polarity corresponding to a picture image of one original image on an electrophotographic sensitive member chargeable to a positive or negative polarity, using two originals each bearing a picture image and having a variant portion between the two images thereon; reversing the electrostatic latent image by imparting thereto a uniform charging of an opposite polarity to said latent image; and, irradiating the reversed primary image with a common portion between two picture images overlapping each other to thereby reduce the primary picture image, whereby an electrostatic latent image corresponding to an additive portion of the other original picture image in relation to original picture primary image is formed.
Claim 12
Independent Claim
130 words
A method for treating a picture image by electrophotography comprising the steps of; forming an electrostatic latent primary image of a specific polarity corresponding to a picture image of one original image on an electrophotographic sensitive member chargeable to a positive or negative polarity, using two originals each bearing a picture image and having a variant portion between the two images thereon; reversing the electrostatic latent image by imparting thereto a uniform charging of an opposite polarity to said latent image; and, irradiating the reversed primary image with a common portion between two picture images overlapping each other to thereby reduce the primary picture image, whereby an electrostatic latent image corresponding to an additive portion of the other original picture image in relation to original picture primary image is formed.
Claim 13
Independent Claim
99 words
A method for treating a picture image by electrophotography comprising the steps of; forming an electrostatic latent primary image of a specific polarity corresponding to an original picture image on an electrophotographic sensitive member chargeable to a positive or negative polarity, using a single original; reversing said electrostatic latent image by imparting thereto a uniform charging of an opposite polarity; and, subjecting the original picture image to irradiation as said image is in the shifted position, whereby reducing said initial picture image, whereby an electrostatic latent image corresponding to a relief image of the original picture image is formed.
Claim 14
Independent Claim
99 words
A method for treating a picture image by electrophotography comprising the steps of; forming an electrostatic latent primary image of a specific polarity corresponding to an original picture image on an electrophotographic sensitive member chargeable to a positive or negative polarity, using a single original; reversing said electrostatic latent image by imparting thereto a uniform charging of an opposite polarity; and, subjecting the original picture image to irradiation as said image is in the shifted position, whereby reducing said initial picture image, whereby an electrostatic latent image corresponding to a relief image of the original picture image is formed.
Claim 15
Independent Claim
113 words
A method for treating a picture image by an electrophotography comprising the steps of; forming an electrostatic latent image of a specific polarity corresponding to a slightly unfocussed original picture image on an electrophotographic sensitive member chargeable to a positive or negative polarity, using a single original; reversing said electrostatic latent image by subjecting it to a uniform charging of an opposite polarity; and, irradiating the original picture image at an identical position and in focussed relation, thereby reducing the initial unfocussed image of the original picture image, thereby there is formed an electrostatic latent image having a portion specially accentuated, corresponding to a detailed or delicate portion of the original picture image.
Claim 16
Independent Claim
113 words
A method for treating a picture image by an electrophotography comprising the steps of; forming an electrostatic latent image of a specific polarity corresponding to a slightly unfocussed original picture image on an electrophotographic sensitive member chargeable to a positive or negative polarity, using a single original; reversing said electrostatic latent image by subjecting it to a uniform charging of an opposite polarity; and, irradiating the original picture image at an identical position and in focussed relation, thereby reducing the initial unfocussed image of the original picture image, thereby there is formed an electrostatic latent image having a portion specially accentuated, corresponding to a detailed or delicate portion of the original picture image.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |