Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1987-12-04
1988-12-20
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Focus or magnification control
355 77, 356444, G03B 2752, G03B 2732
Patent
active
047928301
ABSTRACT:
In printing photographic film, photographic images or defocused images due to improper adjustment of focus at the time of photography should be eliminated from printing. There have been proposed various methods for the purpose. The typical prior art system is defective in that as its aperture has two different photometric systems, the sampling positions at larger and smaller spots should be synchronized to make the system complicated and bulky. The prior art system is further detrimental in that it has only one function, and therefore sensors for image photometry and frame position detection should be provided separately. This invention uses an image sensor having smaller picture elements for detecting image information, and spots for detecting defocused image are formed by the image sensor. This invention system therefore can precisely detect defocused images without necessity of plural photometric systems, and therefore can control exposure amount as well as detection of frame images. This invention can simplify the system, lower the manufacture cost, and obtain better precision for detection/control.
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patent: 4653926 (1987-03-01), Fukui
Fuji Photo Film Co. , Ltd.
Wintercorn Richard A.
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