Photocopying – Contact printing – Light boxes
Patent
1990-06-29
1995-07-04
Picard, Leo P.
Photocopying
Contact printing
Light boxes
118658, G03G 1509
Patent
active
054305284
ABSTRACT:
In a developing apparatus in which a developer containing magnetic particles is carried on a developer carrier to form a magnetic brush and a latent image on a latent image carrier opposing the developer carrier is developed by the magnetic brush, the magnetic brush bristle height and the developing gap are controlled to keep density of a first color image and density of a second and the ensuing color images in color development at predetermined values or more, thereby maintaining quality of printed images stably. There are also provided method and apparatus of measuring the bristle height of the magnetic brush of the developing apparatus, which bristle height is a parameter indispensable for control of the above developing condition, under the dynamic condition that the developing roller rotates.
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Fujiwara Shigetaka
Hirose Youji
Komatsu Isamu
Kumasaka Takao
Simazaki Yuzuru
Hitachi , Ltd.
Hitachi Koki Co,. Ltd.
Horgan Christopher
Picard Leo P.
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