Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1986-11-17
1987-08-18
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Focus or magnification control
355 30, 355 43, 355 53, G03B 2752
Patent
active
046873228
ABSTRACT:
An apparatus for forming the optical image of a photo-pattern placed on a first plane on a second plane comprises projection means having a projection optical system disposed between the first plane and the second plane to form the optical image, focus detecting means including means for detecting the position of the second plane relative to the projection optical system, the in-focus position corresponding to the position of the second plane when the imaging plane of the projection optical system and the second plane are coincident with each other being preset, the focus detecting means putting out a detection signal when the in-focus position is detected by the detecting means, fluctuation detecting means for determining the amount of fluctuation of the imaging plane of the projection optical system caused correspondingly to a variation in the refractive index of the atmosphere, and means responsive to the fluctuation detecting means to control the focus detecting means so that the in-focus position is re-set correspondingly to the amount of fluctuation of the imaging plane determined by the fluctuation detecting means.
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Endo Yutaka
Ishizaka Shoji
Suzuki Hiroyuki
Tanimoto Akikazu
Yanagihara Masamitsu
Nippon Kogaku K. K.
Wintercorn Richard A.
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