Focus apparatus for zoom lens system with distance detection

Details Focus apparatus for zoom lens system with distance detection Focus apparatus for zoom lens system with distance detection

1985-12-30

1986-12-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250201, G01J 120

Patent

active

046330720

ABSTRACT:
Focusing optics placed behind the zooms optics of a zoom arrangement are focused by computing the necessary focusing movement in response to the output of a focal length detector and an object distance detector. Comparison is made to the actual position of the focusing optics.

REFERENCES:
patent: 3972056 (1976-07-01), Tsujimoto et al.
patent: 4083057 (1978-04-01), Quinn
patent: 4183639 (1980-01-01), Suwa
patent: 4329578 (1982-05-01), Rosner
patent: 4482235 (1984-11-01), Yasukawa et al.
patent: 4509842 (1985-04-01), Taniguchi et al.

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