Sonar controlled two focal position lens system

Details Sonar controlled two focal position lens system Sonar controlled two focal position lens system

1977-10-06

1979-04-10

Adams, Russell E.

354 25, G03B 300

Patent

active

041485742

ABSTRACT:
A photographic camera in which a two-position lens is focused automatically on subjects located within "near" and "far" distance ranges from the camera. The lens is normally positioned in one of the two positions and movable to the other of the two positions in response to a signal generated by an electronic ranging circuit upon the detection of subject location in the focus range to which the other position corresponds.

REFERENCES:
patent: RE27461 (1972-08-01), Harvey
patent: 3185059 (1965-05-01), Durst
patent: 3443502 (1969-05-01), Harvey
patent: 3479943 (1969-11-01), Goshima
patent: 3618499 (1971-11-01), Harvey
patent: 3736057 (1973-05-01), Harvey
patent: 4065778 (1977-12-01), Harvey

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