Electrophotography – Control of electrophotography process – Control of developing
Patent
1997-11-05
1999-01-12
Pendegrass, Joan
Electrophotography
Control of electrophotography process
Control of developing
118691, G03G 1508
Patent
active
058600418
ABSTRACT:
A device for measuring toner concentration of developer housed in a developing system, which developer comprising toner and carrier. The device has a transparent detection window facing the interior of the developing system, which transparent detection window comprising a first transparent plate member and a second transparent plate member being in contact with the first transparent plate member. The first transparent plate member is made of a material which becomes charged, through its contact with the second transparent plate member, with the opposite polarity from the charge polarity of the toner and the second transparent plate member is made of a material which becomes charged, through its contact with the carrier, with the same polarity from the charge polarity of the toner, so that the second transparent plate member strongly repels the toner having the same polarity charge and adherence of the toner to the second transparent plate member is reliably prevented.
REFERENCES:
patent: 5117259 (1992-05-01), Etou et al.
patent: 5383007 (1995-01-01), Kinoshita et al.
patent: 5398106 (1995-03-01), Eguchi
patent: 5530530 (1996-06-01), Tanaka et al.
Matsuura Kuniya
Tanaka Masaki
Watanabe Toshifumi
Minolta Co. , Ltd.
Pendegrass Joan
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