Direct focus feedback autofocus system

Details Direct focus feedback autofocus system Direct focus feedback autofocus system

1994-07-19

1996-06-25

Gellner, Michael L.

G03B 310

Patent

active

055305148

ABSTRACT:
An improved auto focus system particularly adapted for use in a camera for automatic focus control of a camera taking lens having first and second linear arrays of photosensitive elements spaced apart laterally from one another and spaced apart in separate planes and first and second lenslets for imaging the scene to be photographed thereon. The system functions by autocorrelation of first and second signals output from the first and second linear arrays, employing parallax range derivation from the first and second signals to derive a motor drive signal, applying the motor drive signal to the taking lens focus adjustment mechanism to adjust the taking lens, employing contrast derivation from the first and second signals during adjustment of the taking lens, and halting adjustment of the taking lens when a position of best focus is indicated by the contrast derivation.

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P. Carellas, "Everyday Optics", Optics and Photonics News, Sep. 1993, pp. 6, 7, 28.

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