Photocopying – Contact printing – Light boxes
Patent
1989-04-13
1991-02-05
Braun, Fred L.
Photocopying
Contact printing
Light boxes
118645, 118657, 118661, 355246, 355326, 355327, G03G 1509
Patent
active
049909614
ABSTRACT:
An electrophotographic apparatus having: a developer unit that has a magnetic developing roller for applying toner to electrostatic latent image areas formed on the surface of a photoconductor and that has a shutter which is closed to regulate the distribution of the toner to the photoconductor, a developing bias voltage for controlling adherence of the toner to the photoconductor being applied to said developer unit; and a bias voltage source for applying, when the shutter of the developer unit is closed, a developing bias voltage of the level between 0V and the developing bias voltage applied when the shutter is opened, thereby preventing blank spots from appearing in transferred images without increasing image-overtoning and also preventing damages from being caused to the surface of the fuser rollers of a fuser unit.
REFERENCES:
patent: 4077358 (1978-03-01), Kito
patent: 4460267 (1984-07-01), Ogawa
patent: 4540272 (1985-09-01), Abe et al.
patent: 4600295 (1986-07-01), Suzuki
patent: 4754301 (1988-06-01), Kasamura et al.
patent: 4755850 (1988-07-01), Suzuki et al.
patent: 4f814834 (1989-03-01), Endo et al.
Maeda Yasutaka
Miyamoto Tsuyoshi
Nukushina Etsuzi
Takata Kyouichi
Ueno Yukihiko
Braun Fred L.
Dang Thu Anh
Sharp Kabushiki Kaisha
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