Focus detecting device

Details Focus detecting device Focus detecting device

1979-07-23

1984-09-11

Perkey, William B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250204, 354409, G03B 300, G01J 136

Patent

active

044706766

ABSTRACT:
In the device disclosed, an image formed by an optical system is scanned by an image sensor composed of independently arranged photoelectric transducing elements to produce an image scanning signal. A detecting circuit detects the variation of the brightness between the adjacent image elements as a measure of the sharpness of the image and the focus of the optical system. The focus detection accuracy is improved by non-linear transformation of the brightness variation signal with a non-linear transformation circuit that weighs the brightness variation signal on the basis of the signal level.

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"Two Dimensional Charge Transfer Arrays", IEEE Journal of Solid-State Circuits, by Carlo H. Sequin, vol. SC9-9, No. 3, Jun. 1974, pp. 134-142.
Frosch, et al., "Optical Microtopography Measurement and/or Automatic Focussing", IBM Technical Disclosure Bulletin, vol. 15, No. 2, 7/72, pp. 504-505.

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