Automatic focus adjusting device

Details Automatic focus adjusting device Automatic focus adjusting device

1989-02-09

1991-10-22

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

354266, 2502012, G03B 1336, G03B 1738, G02B 728

Patent

active

050600028

ABSTRACT:
A focus adjusting device which finds the lens driving amount for the position of the image plane in the future based on focus adjustment data obtained in past focus adjustment cycles includes a calculation circuit for calculating the lens driving amount or the position of the image plane in accordance with predetermined functional equations which use the data obtained in the past. The functional equation or equations used may be changed depending upon the number of times in the past over which the focus adjusting cycle was executed, or the reliability, e.g., contrast, of the auto focus signal.

REFERENCES:
patent: 4783677 (1988-11-01), Hamada et al.
patent: 4908645 (1990-03-01), Higashihara et al.

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