Automatic focusing device

Details Automatic focusing device Automatic focusing device

1978-07-07

1979-09-25

Griffin, Donald A.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, 353101, G03B 708, G03B 302

Patent

active

041688902

ABSTRACT:
This invention discloses an automatic focusing device for cameras and other optical apparatus which comprises scanning means for at least a portion of the focused image, and the scanning current varies the focusing means automatically until the scanning current shows a maximum of high-frequency component to low-frequency component power.

REFERENCES:
patent: 3211831 (1965-10-01), Steiner
patent: 3560647 (1971-02-01), Harmon
patent: 3610934 (1971-10-01), Turner
patent: 3708619 (1973-01-01), Martin
patent: 3713371 (1973-01-01), Kurihara et al.
patent: 3896304 (1975-07-01), Aoki et al.
patent: 3918071 (1975-11-01), Albrecht

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