Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1982-11-29
1984-10-16
Hix, L. T.
Photocopying
Projection printing and copying cameras
Focus or magnification control
355 53, 355 54, 355 56, G03B 2752
Patent
active
044771835
ABSTRACT:
An automatic focusing apparatus according to the present invention is constructed of a base on which a substrate is placed, detection means for detecting a pressure of air which is caused to flow out of an interspace between the substrate and an orifice by spurting the air from the orifice toward the substrate, reference pressure generation means for generating a reference pressure which is necessary for setting a standard distance between the substrate and the orifice, a pressure transducer which receives pressure signals from said detection means and said reference pressure generation means and which converts a pressure difference between these pressure signals into an electric signal, base drive means for moving the substrate in parallel with the orifice on the basis of the output signal from said pressure transducer, and offset signal generation means for generating a signal which, when superposed on the output signal from said pressure transducer, serves to shift the substrate from the standard distance.
REFERENCES:
patent: 3917930 (1975-11-01), Davey et al.
patent: 3984678 (1976-10-01), Uchiyama et al.
patent: 4032856 (1977-06-01), Goldner
patent: 4298273 (1981-11-01), Nishizuka et al.
Hosaka Sumio
Kawamura Yoshio
Kuniyoshi Shinji
Kurosaki Toshiei
Takanashi Akihiro
Hitachi , Ltd.
Hix L. T,.
Rutledge Della J.
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