Electrophotography – Diagnostics – Image forming component
Patent
1997-01-30
1998-06-23
Pendegrass, Joan R.
Electrophotography
Diagnostics
Image forming component
399314, G03G 1516
Patent
active
057714304
ABSTRACT:
An image forming apparatus includes a photoreceptor drum having a toner image formed on its surface, a transfer drum having a dielectric layer, a semiconductive layer and a conductive layer arranged orderly, a power source section applying a predetermined voltage to the conductive layer, and a ground roller which is grounded and comes in contact with the surface of the dielectric layer through a transfer paper. In addition, in the image forming apparatus, a foaming body having elastic property is used for the semiconductive layer, and a diameter of foams in the semiconductive layer is controlled within the range of between 200 .mu.m and 400 .mu.m. Alternatively, the average micro-gap (which is obtained by equalization of a micro-gap formed between the semiconductive layer and the dielectric layer) may be controlled within the range of between 20 .mu.m and 50 .mu.m. Consequently, a stable electrostatic attraction of the transfer paper to the transfer drum is achieved, and unsatisfactory transfer of the toner image onto the transfer paper is prevented. The image forming apparatus realizes an excellent image formation onto the transfer paper, and the arrangement capable of reduction of the manufacturing cost.
REFERENCES:
patent: 5390012 (1995-02-01), Miyashiro et al.
patent: 5623329 (1997-04-01), Yamauchi et al.
Pendegrass Joan R.
Sharp Kabushiki Kaisha
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