Automatic controller of electrification of magnetic toner

Details Automatic controller of electrification of magnetic toner Automatic controller of electrification of magnetic toner

1981-07-08

1983-02-01

Moses, R. L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

118657, 355 3DD, G03G 1500

Patent

active

043712576

ABSTRACT:
In an electrophotographic developing unit including a magnet roll to apply developer consisting of electrically-insulated magnetic toner particles to a latent image to be developed and an electrifying device to electrify the magnetic toner particles in one polarity, the disclosed automatic controller has a detecting electrode disposed where the magnet roll forms ear-ups of the developer, the detecting electrode receiving a bias voltage of the opposite polarity to that of the electric charge on the magnetic toner particles, a photocell cooperating with a light source in detecting the amount of toner particles attracted by the detecting electrode so as to produce a signal representing the thus detected amount, and a control circuit to control the electrifying device in response to the signal from the photocell.

REFERENCES:
patent: 3879737 (1975-04-01), Lunde
patent: 3909258 (1975-09-01), Kotz
patent: 4194830 (1980-03-01), Ohnuma et al.
patent: 4286543 (1981-09-01), Ohnuma et al.

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