Focus detecting system

Details Focus detecting system Focus detecting system

1990-03-30

1990-11-27

Adams, Russell E.

G03B 1336

Patent

active

049740083

ABSTRACT:
A focus detecting system is provided with a non-destructive type photoelectric conversion element array, an A/D converter for converting the analog output of the photoelectric conversion element array into a corresponding digital value, and a focus-detecting arithmetic circuit for performing arithmetic operations upon the distance to an object on the basis of the digital value output from the A/D converter. In the focus detecting system, when a predetermined initial integration period elapses after the storage of the electric charge has been started, a sequence of in-focus-state detecting operations comprising the steps of effecting non-destructive readout of the output of the photoelectric conversion element array, performing A/D conversion of the readout output and performing arithmetic operations for focus detection is repeatedly executed so that focus detection is effected. With this arrangement, the integration period required for a focus detecting operation can be rationally made as short as possible in accordance with the states of an object, such as brightness and contrast.

REFERENCES:
patent: 4752831 (1988-06-01), Biber et al.

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