Photocopying – Contact printing – Light boxes
Patent
1991-04-15
1993-01-05
Grimley, A. T.
Photocopying
Contact printing
Light boxes
3461531, 355203, 355246, G03G 200
Patent
active
051775310
ABSTRACT:
An electrostatic recorder including an electrostatic latent image measuring instrument for measuring a state of an electrostatic latent image formed on a photosensitive substance, and executed a printing process until an electrostatic latent image formed on a surface of a photosensitive substance based on measured data is transferred onto a blank form as a visual image by a transfer device by adjusting control factors such as exposure, exposure time, electrostatic charge voltage, development bias, temperature and humidity. The electrostatic latent image measuring instrument is provided with distance sensors which, when a measuring electrode is disposed near to the photosensitive substance, maintains a constant distance therebetween. It is thus possible to measure an electrostatic latent image even if the photosensitive substance is eccentric. Furthermore, an arc between the measuring electrode and the photosensitive substance is prevented by utilizing a gas having a high arc starting voltage between the measuring electrode and the photosensitive substance of the electrostatic latent image measuring instrument.
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patent: 4583839 (1986-04-01), Suzuki
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Patent Abstracts of Japan vol. 6, No. 255 (P-162 Dec. 14, 1982 & JP-1-57 151 957 (Canon K.K.) Sep. 20, 1982 Abstract.
Patent Abstracts of Japan, vol. 10, No. 132 (P-456) [2189], May 16, 1986; & JP-A-60 254 061 (Rixho K.K.) Dec. 14, 1985 Abstract Partial European Search Report EP 91 10 5810.
Igawa Tatsuo
Miyasaka Toru
Nagata Tetsuya
Umeda Takao
Grimley A. T.
Hitachi , Ltd.
Stanzione P. J.
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