Automatic focus adjusting device

Details Automatic focus adjusting device Automatic focus adjusting device

1979-07-12

1981-12-01

Hix, L. T.

Optics: motion pictures

Removable film strip magazine type

352140, 250201, G03B 1318, G03B 310, G01J 144

Patent

active

043033202

ABSTRACT:
An improved automatic focusing system for an optical instrument includes a scanner driven oscillatably across an angle to detect a subject positioned between infinity and the minimum focus condition of the objective lens of the optical instrument. The scanner is adjusted in response to the focus condition of the lens to align the bisector of the angle scanned with the subject when the lens is in perfect focus by electronic and mechanical interconnecting feedback means between the objective lens focusing ring and the scanning system.

REFERENCES:
patent: 4021821 (1977-05-01), Peterson
patent: 4059756 (1977-11-01), Wilwerding
patent: 4059757 (1977-11-01), Wilwerding
patent: 4085320 (1978-04-01), Wilwerding
patent: 4091275 (1978-05-01), Wilwerding
patent: 4093365 (1978-06-01), Isono
patent: 4123765 (1978-10-01), Isono

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