Automatic focus adjusting device

Details Automatic focus adjusting device Automatic focus adjusting device

1984-12-10

1987-06-16

Wan, Gene

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, G01J 120

Patent

active

046738061

ABSTRACT:
In the disclosed automatic focus adjusting device of the active type having a light emitting element for projecting light for focus detection onto an object to be photographed, light emitting operation and non-light emitting operations of the light emitting element are periodically effected, and the duty ratio or frequency of the light emitting period is variable.

REFERENCES:
patent: 4383168 (1983-05-01), Luck

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