Image sharpness detecting system and apparatus utilizing the sam

Details Image sharpness detecting system and apparatus utilizing the sam Image sharpness detecting system and apparatus utilizing the sam

1974-10-18

1976-06-01

Stolwein, Walter

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250211R, 356123, 354 25, G01J 120, H01J 3912

Patent

active

039611787

ABSTRACT:
An image sharpness detecting system employing two photoconductive cells of different geometry which permits detection of an optimum degree of sharpness of an image formed thereon regardless of variation in the direction of light distribution of the image relative to the electrodes of the cells. Differences between light response characteristics of these two cells due to the different geometry thereof are compensated for by providing optical means such as filter arranged between the cells, whereby the system is made accurately and reliably responsive to variation of light distribution even at low total light levels.

REFERENCES:
patent: 2879405 (1959-03-01), Pankove
patent: 3193686 (1965-07-01), Heinz
patent: 3222531 (1965-12-01), Morrison
patent: 3649840 (1972-03-01), Thorn et al.
patent: 3830571 (1974-08-01), Imai et al.
patent: 3875401 (1975-04-01), Stauffer

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