Photocopying – Contact printing – Light boxes
Patent
1992-05-13
1994-01-04
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
118691, 355246, G03G 1500
Patent
active
052764818
ABSTRACT:
An apparatus for optically measuring toner density, having a rotary member which rotates and retains a developer constituted by a toner and a carrier by magnetic force, a transparent detection window which is disposed at a position where the developer retained on the rotary member rubs said detection window through rotation of said rotary member, a detection device which illuminates the developer through the detection window and detects the amount of reflected light from the developer and the magnitude of variations of the amount in response to rotation of the rotary member, and a warning device which issues an abnormal warning when the magnitude is smaller than a predetermined reference value, and a method for optically measuring toner density by using the apparatus.
REFERENCES:
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patent: 4431300 (1984-02-01), Snelling
patent: 4536080 (1985-08-01), Hauser
patent: 4550998 (1985-11-01), Nishikawa
patent: 4551002 (1985-11-01), Aoki et al.
patent: 4648702 (1987-03-01), Goto
patent: 4801980 (1989-01-01), Arai et al.
patent: 5111247 (1992-05-01), Nichols
patent: 5117259 (1992-05-01), Etou et al.
patent: 5146274 (1992-09-01), Hattori et al.
Etou Kouichi
Kinoshita Naoyoshi
Beatty Robert
Minolta Camera Kabushiki Kaisha
Pendegrass Joan H.
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