Focus detecting apparatus for selecting the operating process in

Details Focus detecting apparatus for selecting the operating process in Focus detecting apparatus for selecting the operating process in

1987-07-07

1989-01-24

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, 250204, G03B 300, G01J 120

Patent

active

048004103

ABSTRACT:
A focus detecting apparatus in which light distributions having their relative positional relation varying in conformity with the focus adjusted state of an objective optical system and based on an object are received by a light-receiving device having a plurality of picture elements and the output signal of the light-receiving device is operated in two different processes, and an evaluated values dependent on the contrast is operated in each of the processes and the evaluated values are compared with each other, and the result calculated in the process of better contrast is adopted as a value indicative of the focus adjusted state of the objective optical system.

REFERENCES:
patent: 4333007 (1982-06-01), Langlais et al.
patent: 4559446 (1985-12-01), Suzuki
patent: 4561749 (1985-12-01), Utagawa
patent: 4618236 (1986-10-01), Akashi et al.
patent: 4636624 (1987-01-01), Ishida et al.

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