Photocopying – Contact printing – Light boxes
Patent
1991-05-14
1992-05-26
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
355246, 118691, G03G 1509
Patent
active
051172593
ABSTRACT:
Apparatus for measuring developer density comprising, a container containing a developer constituted by a toner and a carrier, a rotary member agitating the developer in the container with its rotation, a transparent detection window facing the container, and having an electrically conductive film on its surface facing the developer, a measuring section measuring developer density in container on the basis of reflected light from developer illuminated through the detection window, an electrode which is supported by the rotary member, and is rotated together with the rotary member such that a gap between the electrode and the detection window is maintained at a predetermined value, the electrode being made, at least at one portion facing the detection window, of electrically conductive material, at least one magnet which is supported by the electrode, retains the developer, so that the magnet makes the developer to be brought into contact with the detection window with rotation of the rotary member, and a bias application member for applying bias between the detection window and the electrode so as to make the detection window and the toner electrically repulsive to each other.
REFERENCES:
patent: 4266141 (1981-05-01), Hirakura et al.
Etou Kouichi
Kinoshita Naoyoshi
Kitakubo Hideo
Minolta Camera Kabushiki Kaisha
Pendegrass Joan H.
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