Focusing control device

Details Focusing control device Focusing control device

1981-07-10

1985-11-05

Perkey, William B.

Optics: motion pictures

Removable film strip magazine type

352140, G03B 310

Patent

active

045509948

ABSTRACT:
An automatic focusing device for a cine camera operates so that the speed at which the lens is moved to its optimum focusing position decreases as a perfect focus is reached. A comparator determines how far out of focus the system is, and a pulse width modulator provides a zero to 100% energization signal to the servo control circuit. The farther the system is out of focus, the larger percentage energization signal from the pulse width modulator and the faster the lens will be moved toward the optimum position.

REFERENCES:
patent: 4251145 (1981-02-01), Cocron et al.
patent: 4303321 (1981-12-01), Enomoto et al.
patent: 4314187 (1982-02-01), Cocron

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