Claims
- 1. In an electrographic apparatus comprising a photosensitive screen composed of an insulating layer, two electrically conductive layers coated on opposite sides of said insulating layer and a photosensitive layer coated on one of said electrically conductive layers, a corona discharge device arranged at one side of said photosensitive screen and emitting a flow of corona ions, and a dielectric coated record sheet arranged at the other side of said photosensitive screen, whereby an electrostatic latent image produced on said photosensitive layer of said photosensitive screen causes said flow of corona ions directed from said corona discharge device through said photosensitive screen toward said dielectric coated record sheet to modulate so as to produce, on said dielectric coated record sheet, an electrostatic charge image corresponding to said electrostatic latent image on said photosensitive layer of said photosensitive screen, the improvement comprising means for adjusting a bias voltage applied between said two electrically conductive layers of said photosensitive screen, said means for adjusting said bias voltage being automatically operable in response to an electric potential built up on said electrostatic latent image produced on said photosensitive layer.
- 2. In an electrographic apparatus comprising a photosensitive screen composed of an insulating layer, two electrically conductive layers coated on opposite sides of said insulating layer and a photosensitive layer coated on one of said electrically conductive layers, a corona discharge device arranged at one side of said photosensitive screen and emitting a flow of corona ions, a dielectric coated record sheet arranged at the other side of said photosensitive screen, whereby an electrostatic latent image produced on said photosensitive layer of said photosensitive screen causes said flow of corona ions directed from said corona discharge device through said photosensitive screen toward said dielectric coated record sheet to modulate so as to produce, on said dielectric coated record sheet, an electrostatic charge image corresponding to said electrostatic latent image on said photosensitive layer of said photosensitive screen, and means for selecting a number of copies to be obtained from the electrostatic latent image on said screen, the improvement comprising means for automatically changing said bias voltage applied between said two electrically conductive layers of said photosensitive screen in response to the number of copies selected, and means for manually adjusting said bias voltage mounted on the outside of said electrographic apparatus.
Priority Claims (1)
Number |
Date |
Country |
Kind |
51-104223 |
Sep 1976 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 826673 filed Aug. 22, 1977, now U.S. Pat. No. 4,148,577.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3942980 |
Holl |
Mar 1976 |
|
4006983 |
Pressman et al. |
Feb 1977 |
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Foreign Referenced Citations (1)
Number |
Date |
Country |
2653793 |
Jun 1977 |
DEX |
Continuations (1)
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Number |
Date |
Country |
Parent |
826673 |
Aug 1977 |
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