Developing apparatus for reverse-developing an electrostatic lat

Details Developing apparatus for reverse-developing an electrostatic lat Developing apparatus for reverse-developing an electrostatic lat

1990-06-01

1991-03-19

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355251, 118658, G03G 1509

Patent

active

050015176

ABSTRACT:
A method and apparatus for development. A layer of developer which is a mixture of insulative magnetic particles and toner particles is carried on a surface of a developing sleeve which accommodates therein a magnet roller. A latent image bearing member carrying a latent image to be developed is so opposed to the developing sleeve that the latent image bearing member to a portion of the magnet roller which is between the two adjacent magnetic poles. The surfaces of the latent image bearing member and the developer carrying member are maintained with a clearance which is larger than the thickness of the developer layer. An alternating electric field is formed in or across the clearance to alternatingly repeat two steps, i.e., a toner transferring step wherein the toner particles are transferred from the developer layer on the developer carrying sleeve to the latent image bearing member, irrespective of whether it is the image area or whether it is non-image area, and a back transfer step wherein excessive toner particles are transferred back to the developer carrying member, whereby a developer image is provided.

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patent: 4511239 (1985-04-01), Kanbe et al.
patent: 4525056 (1985-06-01), Masahiko et al.
patent: 4540645 (1985-09-01), Honda et al.
patent: 4557992 (1985-12-01), Haneda et al.
patent: 4579442 (1986-04-01), Minejima

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