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US 4,380,384 AGranted
Charging device for electronic copier
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorsTsuyoshi Ueno, Hideo Mukai
Life of this patent
Estimating the term…
Abstract
A charging device for an electronic copier including a charging belt having a characteristic resistance ranging from 10.sup.4 to 10.sup.10 .OMEGA..cm. The copier's charging belt is in contact with the photosensitive drum, and as the photosensitive drum is rotated a voltage smoothly increasing over a predetermined period of time is applied to the charging belt for uniformly charging the photosensitive drum.
Claims9
An electronic copier comprising:
- (a) a photosensitive medium;
- (b) charging belt means, provided to be in contact with said photosensitive medium and having a characteristic resistance ranging from about 10.sup.4 to about 10.sup.10 .OMEGA..cm, for charging said photosensitive medium;
- (c) power supply means for applying a voltage smoothly increasing over a predetermined period of time to said charging belt means;
- (d) exposure device means for forming an electrostatic latent image on said photosensitive medium after it has been charged;
- (e) developing device means for developing the electrostatic latent image formed on said photosensitive medium to obtain a visible image;
- (f) transfer device means for transferring the visible image formed on said photosensitive medium onto a recording sheet;
- and
- (g) fixing device means for fixing the visible image transferred onto said recording sheet.
5 more elements
An electronic copier comprising:
- (a) a photosensitive medium;
- (b) endless charging belt means, provided in contact with said photosensitive medium and having a characteristic resistance ranging from about 10.sup.4 to about 10.sup.10 .OMEGA..cm, for charging said photosensitive medium;
- (c) drive mechanism means for driving said charging belt at a peripheral speed different from that of said photosensitive medium;
- (d) power supply means for applying a voltage to said charging belt means such as to produce a potential gradient therein;
- (e) exposure device means for forming an electrostatic latent image on said photosensitive medium;
- (f) developing device means for developing the electrostatic latent image formed on said photosensitive medium to obtain a visible image;
- (g) transfer device means for transferring the visible image formed on said photosensitive medium onto a recording sheet;
- and
- (h) fixing device means for fixing the visible image transferred onto said recording sheet.
6 more elements
An electronic copier comprising:
- (a) a photosensitive medium;
- (b) at least two support rollers rotatably supported parallel to the periphery of said photosensitive medium and spaced apart from one another;
- (c) drive mechanism means for rotating said support rollers;
- (d) endless charging belt means passed around said support rollers such that it is partly in contact with the periphery of said photosensitive medium, said charging belt being conductive and having a characteristic resistance ranging from about 10.sup.4 to about 10.sup.10 .OMEGA..cm;
- (e) power supply means for supplying a voltage smoothly increasing over a predetermined period of time to said charging belt;
- (f) exposure device means for forming an electrostatic latent image on said photosensitive medium;
- (g) developing device means for developing the electrostatic latent image formed on said photosensitive medium to obtain a visible image;
- (h) transfer device means for transferring the visible image formed on said photosensitive medium;
- and
- (i) fixing device means for fixing the visible image transferred onto said recording sheet.
7 more elements
Dependencies are inferred from the claim text.