Electrophotographic apparatus of retentive type

Details Electrophotographic apparatus of retentive type Electrophotographic apparatus of retentive type

1980-01-30

1982-06-15

Braun, Fred L.

Photocopying

Including fiber optics

118657, 118658, 355 3R, G03G 1500, G03G 1509

Patent

active

043347720

ABSTRACT:
An electrophotographic apparatus of the retention type for forming a number of copies from the same and single electrostatic charge image once formed on a photosensitive drum by repeating successively developing and transferring operations. The electrophotographic apparatus includes a magnetic brush developing device having a fixed magnet, an aluminum sleeve arranged rotatably around the magnet, and an electrically insulating surface layer applied on the sleeve, on which sleeve surface a two component developing agent consisting of magnetic carriers and insulating toners is adhered as furs of a magnetic brush, whereby a magnetic flux density measured at the sleeve surface in a developing area is set to 600 to 800 Gauss, preferably 650 to 750 Gauss and a distance between the drum and the sleeve is selected to 2 to 5 mm, preferably 3 to 4 mm.

REFERENCES:
patent: 3736055 (1973-05-01), Davidge et al.
patent: 3923391 (1975-12-01), Washio et al.
patent: 4081571 (1978-03-01), Nishihama et al.

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