Device for detecting the focal value for the focusing of optical

Details Device for detecting the focal value for the focusing of optical Device for detecting the focal value for the focusing of optical

1988-07-14

1990-03-27

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250204, G03B 300, G01J 136

Patent

active

049124978

ABSTRACT:
A device for detecting the focal deviation value for focusing an optical apparatus includes a pair of optical lenses for receiving light from the focal object, which produces a pair of images that travel along two spatially isolated optical paths. These images are detected by a pair of photoelectric transducer arrays or photodiode arrays, which produce a pair of image signals that represents the distribution of light intensity in each image. Each image signal is composed of a plurality of image signal values. These signal values are used by a correlation evaluator, which extracts pairs of partial image signals corresponding to a predetermined number of consecutive image signal values, evaluates the correlation between any pair of extracted partial image signals, detects the position of the pair of extracted partial image signals and produces a corresponding focal deviation value for focusing the optical apparatus. The number of signal values in each image signal is not more than 1.5 times the predetermined number of consecutive image signal values of each extracted partial image signal. The device will produce a focal deviation value which shows the best correlation between extracted partial image signals.

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patent: 4640613 (1987-02-01), Yokoyama et al.
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patent: 4734571 (1988-03-01), Hamada et al.
patent: 4746790 (1988-05-01), Sorimachi
patent: 4766302 (1988-08-01), Ishida et al.

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