Electrophotographic copying machine
AssigneeCanon Kabushiki Kaisha
InventorsKeiji Tanaka, Yujiro Ando, Katsunobu Ohara
Life of this patent
Estimating the term…
Abstract
In an electrophotographic copying machine of the type which transfer an electrostatic latent image formed on a photosensitive element, usually comprising a conductive base and a photoconductive layer thereon, onto a recording member, an electric dust collector is provided to clean the air flowing in the vicinity of a corona discharger and the photosensitive member. In order to direct the dust-free air, there is provided an air flow passage and a blower such as a fan. The corona discharger and the electric dust collector may be constructed integrally or separately. All of the air in the copying machine may be made dust-free.
Claims10
An electrophotographic apparatus wherein an electrostatic latent image is formed with the utilization of at least means for applying voltage by corona discharge and illuminating means, comprising:
- a photosensitive member;
- means for charging said photosensitive member;
- wall means for supplying a gas adjacent and between said charging means and said photosensitive member, said wall means being disposed along and adjacent said charging means;
- and
- dust removing means connected to said wall means.
An electrophotographic apparatus wherein an electrostatic latent image is formed with the utilization of means for applying voltage by corona discharge and illuminating means, comprising:
- a photosensitive member;
- means for charging said photosensitive member;
- first wall means for supplying a gas between said charging means and said photosensitive member;
- second wall means for sucking the gas supplied by said first wall means;
- and
- dust removing means provided with blower means which is provided continuously to said first wall means.
An electrophotographic apparatus wherein an electrostatic latent image is formed with the utilization of means for applying voltage by corona discharge and illuminating means, comprising:
- a photosensitive member;
- a dust collector provided with blower means for filling the area adjacent said photosensitive member with gas which has passed through said dust collector;
- and
- wall means for segregating said photosensitive member from ambient air.
An electrophotographic apparatus wherein an electrostatic latent image is formed with the utilization of means for applying voltage by corona discharge and illuminating means, comprising:
- a photosensitive member;
- dust removing means;
- and
- blower means;
- said dust removing means and blower means being disposed in a casing for said means for forming an electrostatic latent image, and gas which has passed through said dust removing means being present adjacent said photosensitive member.
An electrophotographic machine wherein an electrostatic latent image is formed with the utilization of means for applying voltage by corona discharge and illuminating means, comprising:
- a photosensitive screen having numerous small openings, said photosensitive screen modifying ion flow to the pattern of an electrostatic latent image;
- means for charging said photosensitive screen;
- wall means for supplying a gas adjacent and between said charging means and said photosensitive material;
- and
- a dust collector connected to said wall means.
An electrophotographic machine wherein an electrostatic latent image is formed with the utilization of means for applying voltage by corona discharge and illuminating means, comprising:
- a photosensitive screen having numerous small openings, said photosensitive screen modifying ion flow to the pattern of an electrostatic latent image;
- a dust collector provided with blower means for filling the area adjacent said photosensitive screen with a dust free gas;
- and
- wall means for segregating said photosensitive screen from the ambient air.
Dependencies are inferred from the claim text.