Automatic focusing system

Details Automatic focusing system Automatic focusing system

1985-11-19

1987-10-06

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250351, G03B 300

Patent

active

046979042

ABSTRACT:
A metering light is projected onto an object to be photographed, and the reflection from the object with illumination of the metering light is analyzed to derive an electrical signal in accordance with which the focusing position of a photographic lens is adjusted. When the reflection is found to include a radiation resulting from foreign illumination which is harmonic with the pulsating frequency rate of the metering light, the output of the metering light source is modulated to a random pulsating form.

REFERENCES:
patent: 4065778 (1977-12-01), Harvey
patent: 4533227 (1985-08-01), Takahashi
patent: 4561746 (1985-12-01), Matsuda et al.
patent: 4584477 (1986-04-01), Yoshino et al.

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