Abstract An electrophotographic material consisting of a high-insulating base and a photoconductive insulating layer coated directly thereon, is exposed uniformly on the side of the surface of the photoconductive insulating layer, to lights which are absorbable by the photoconductive insulating layer. Then, corona ions with a desired polarity produced by a corona discharge unit are sprayed onto the surface of the photoconductive insulating layer while the surface of the photoconductive insulating layer is simultaneously exposed to corona ions with the opposite polarity produced by another corona discharge unit. Thus, a conductive layer is temporarily produced on the surface of the photoconductive insulating layer so that the photoconductive insulating layer is charged or sensitized.
Inventors
👤 M Sato
👤 M Takimoto
👤 T Komaki
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-29 04:54
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
136 words
A METHOD FOR CHARGING TO A FIRST POLARITY ELECTROPHOTOGRAPHIC MATERIAL CONSISTING OF AN INSULATING BASE AND A PHOTOCONDUCTIVE INSULATING LAYER DIRECTLY COATED THEREON AND INCLUDING A SEMICONDUCTOR HAVING MAJORITY CARRIERS OF SAID FIRST POLARITY, SAID METHOD COMPRISING: A. UNIFORMLY EXPOSING THE SURFACE OF SAID PHOTOCONDUCTIVE LAYER TO LIGHT OF A WAVELENGTH ABSORBABLE BY SAID PHOTOCONDUCTIVE INSULATING LAYER SUCH THAT SAID SURFACE BECOMES CONDUCTIVE; AND SIMULTANEOUSLY WHILE SAID SURFACE IS STILL CONDUCTIVE: B. EXPOSING A FIRST AREA OF SAID SURFACE OF SAID PHOTOCONDUCTIVE INSULATING LAYER TO FIRST CORONA DISCHARGE IONS OF A FIRST POLARITY; AND C. EXPOSING A SECOND AREA OF SAID SURFACE OF SAID PHOTOCONDUCTIVE INSULATING LLAYER TO SECOND CORONA DISCHARGE IONS OF THE OPPOSITE POLARITY TO SAID FIRST CORONA DISCHARGE IONS, WHEREBY SAID SURFACE OF SAID PHOTOCONDUCTIVE INSULATING LAYER BECOMES CHARGED TO SAID FIRST POLARITY.
Claim 2
Independent Claim
136 words
A METHOD FOR CHARGING TO A FIRST POLARITY ELECTROPHOTOGRAPHIC MATERIAL CONSISTING OF AN INSULATING BASE AND A PHOTOCONDUCTIVE INSULATING LAYER DIRECTLY COATED THEREON AND INCLUDING A SEMICONDUCTOR HAVING MAJORITY CARRIERS OF SAID FIRST POLARITY, SAID METHOD COMPRISING: A. UNIFORMLY EXPOSING THE SURFACE OF SAID PHOTOCONDUCTIVE LAYER TO LIGHT OF A WAVELENGTH ABSORBABLE BY SAID PHOTOCONDUCTIVE INSULATING LAYER SUCH THAT SAID SURFACE BECOMES CONDUCTIVE; AND SIMULTANEOUSLY WHILE SAID SURFACE IS STILL CONDUCTIVE: B. EXPOSING A FIRST AREA OF SAID SURFACE OF SAID PHOTOCONDUCTIVE INSULATING LAYER TO FIRST CORONA DISCHARGE IONS OF A FIRST POLARITY; AND C. EXPOSING A SECOND AREA OF SAID SURFACE OF SAID PHOTOCONDUCTIVE INSULATING LLAYER TO SECOND CORONA DISCHARGE IONS OF THE OPPOSITE POLARITY TO SAID FIRST CORONA DISCHARGE IONS, WHEREBY SAID SURFACE OF SAID PHOTOCONDUCTIVE INSULATING LAYER BECOMES CHARGED TO SAID FIRST POLARITY.
Claim 3
Dependent Claim
23 words
The method as defined in claim 1 wherein said photoconductive layer is made of N-type semiconductor material, and said first polarity is negative.