EP0240888A2
Expired / Lapsed
EP
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Color electrophotograhic method and apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1987-03-30
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Granted: —
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Expires: 2007-03-30
Abstract
Abstract Disclosed is a color electrophotographic method of forming a plurality of images of different colors on a photosensitive medium by repetitions of a series of operations including steps for charging, exposure and development. An exposure of photosensitive medium is conducted to form an electrostatic latent image adjacent to a first toner image which has been formed in the previous process with a non-image area provided at the boundary of the first toner image. The difference in potentials between the toner image and the adjacent image is thereby eliminated, thus preventing scattering of toner particles. This results in a clear color print the colors of which are not blurred and of high purity.
Inventors
- 👤 Yuji Takashima
- 👤 Hajime Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 13:27
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/01; G03G13/00; G03G13/01
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
A color electrophotographic method of forming a plurality of toner images of different colors on a photosensitive medium by repetitions of a series of operations including the steps for charging, exposure and development, comprising the step of conducting an exposure to form a second toner image adjacent to a first toner image which has been formed in the previous process with a non-image area provided at the boundary of said first toner image.
Claim 2
Dependent Claim
73 words
A color electrophotographic method of forming a plurality of toner images of different colors on a photosensitive medium by repetitions of a series of operations including the steps for charging, exposure and development, comprising the step of conducting an exposure to form a second toner image adjacent to a first toner image which has been formed in the previous process with a non-image area provided at the boundary of said first toner image.
Claim 3
Dependent Claim
20 words
A color electrophotographic method according to claim l, wherein the width of said non-image area is 0.2 mm or less.
Claim 4
Dependent Claim
20 words
A color electrophotographic method according to claim 2, wherein the width of said non-image area is 0.02 mm or above.
Claim 5
Dependent Claim
51 words
A color electrophotographic method according to claim l, wherein an electrostatic latent image on the photosensitive medium carrying the toner image which has been formed in the previous process is erased such that the difference in potential between said electrostatic latent image and said toner image is 500 V or less.
Claim 6
Dependent Claim
19 words
A color electrophotographic method according to claim 4, wherein said difference in potential is between l00 and 500 V.
Claim 7
Dependent Claim
20 words
A color electrophotographic method according to anyone of claims l to 5, wherein electric charge is erased by irradiating light.
Claim 8
Dependent Claim
23 words
A color electrophotographic method according to anyone of claims l to 6, wherein the development is of a negative to positive inversion development.
Claim 9
Dependent Claim
71 words
A color electrophotographic apparatus for forming a plurality of images of different colors on a photosensitive medium by repetitions of a series of operations including steps for charging, exposure and development, comprising means for exposing the photosensitive medium to form a second toner image adjacent to a first toner image which has been formed in the previous process with a non-image area provided at the boundary of said first toner image.
Claim 10
Dependent Claim
71 words
A color electrophotographic apparatus for forming a plurality of images of different colors on a photosensitive medium by repetitions of a series of operations including steps for charging, exposure and development, comprising means for exposing the photosensitive medium to form a second toner image adjacent to a first toner image which has been formed in the previous process with a non-image area provided at the boundary of said first toner image.
References Cited (Backward Citations)
No citation records indexed.
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