Non-contact development method and apparatus under tangential ma

Details Non-contact development method and apparatus under tangential ma Non-contact development method and apparatus under tangential ma

1985-05-06

1987-03-31

Goodrow, John L.

Coating apparatus

With means to apply electrical and/or radiant energy to work...

With electromagnetic and/or electrostatic removal of...

430122, G03G 1509

Patent

active

046534270

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 developed image is provided.

REFERENCES:
patent: 4511239 (1985-04-01), Kanbe et al.
patent: 4525056 (1985-06-01), Itaya et al.
patent: 4540645 (1985-09-01), Honda et al.

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