Photocopying – Contact printing – Light boxes
Patent
1991-12-02
1993-01-19
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355200, 355208, 355211, G03G 2100
Patent
active
051810719
ABSTRACT:
An apparatus for evaluating the characteristics of a photosensitive drum for use in electrophotography including a rotatable photosensitive drum having characteristics to be measured, a charging portion and an exposure light source portion and the like respectively secured to portions adjacent to the photosensitive drum. The surface potential of the photosensitive drum, which is generated due to operation of the charging portion and the exposure light source portion or the like, is measured by a potential measuring probe which is, together with the charged portion and the exposure light source portion and the like, secured adjacent to a position of the photosensitive drum, at which light is applied at the shortest distance from the exposure light source portion. The photosensitive drum is moved along its lengthwise direction so that the surface potential of the photosensitive drum is measured by the potential measuring probe.
REFERENCES:
patent: 3578862 (1971-05-01), Hudock
patent: 4176943 (1979-12-01), Hasebe
patent: 4348099 (1982-09-01), Fantozzi
patent: 4771339 (1988-09-01), Clinton
patent: 4988188 (1991-01-01), Ohta
Kobayashi Hiroki
Kohno Yuji
Mochizuki Kouichi
Nakajima Satoshi
Grimley A. T.
Shindengen Electric Manufacturing Co. Ltd.
Smith Matthew S.
Yamanashi Electronics Co. Ltd.
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