Image forming apparatus having means for measuring the amount of

Details Image forming apparatus having means for measuring the amount of Image forming apparatus having means for measuring the amount of

1992-08-29

1993-12-14

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118691, 355215, G03G 2100

Patent

active

052707849

ABSTRACT:
An image forming apparatus includes a measuring for measuring an amount of a toner agent deposited on the image carrier. The measuring device has measuring section facing the image carrier, and a conductive cover plate arranged between the measuring section and the image carrier. The cover plate is applied with a voltage whose polarity is equal to the polarity of the toner so that an electric field is generated between the image carrier and the cover plate. The electric field prevents the toner, dispersed from the image carrier, from reaching the measuring section. The toner may also be kept from adhering to the elements of the measuring section by placing a transparent plate between the image carrier and the measuring device.

REFERENCES:
patent: 3936176 (1976-02-01), Whited
patent: 4279498 (1981-07-01), Eda et al.
patent: 4451135 (1984-05-01), Okumura
patent: 4550998 (1985-11-01), Nishikawa
patent: 4723150 (1988-02-01), Lutus et al.
patent: 4796065 (1989-01-01), Kanbayashi
patent: 5059991 (1991-10-01), Morisawa
patent: 5067435 (1991-11-01), Hosaka

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