Developing device using developing roller having specific struct

Details Developing device using developing roller having specific struct Developing device using developing roller having specific struct

1991-05-31

1993-12-14

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118651, 492 53, G03G 1506

Patent

active

052707865

ABSTRACT:
A device for developing a latent image on an image carrier is used in an image forming apparatus. The developing device includes a developing roller, located to contact with the image carrier, for supplying a developing agent to the image carrier, and a blade, located to face the developing roller, for forming a developing agent layer of the developing agent supplied to the image carrier on the developing roller. The developing roller comprises an urethane rubber layer and a conductive urethane resin layer located around the rubber layer, in which the thickness T [.mu.m] of the conductive resin layer satisfies the formula, 3.times.Rz=T=1OO when the maximum surface roughness of the rubber layer is taken in Rz [.mu.m]. in addition, the respective elongations (%) of the rubber and resin layers L.sub.e and L.sub.1, satisfy the formula L.sub.e -L.sub.1 .ltoreq.200.

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Hosoya et al., "Contact-Type Development System Using Monocomponent nonmagnetic Toner," Toshiba R&D Center, pp. 25-28.

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