Automatic focus control system for video camera

Details Automatic focus control system for video camera Automatic focus control system for video camera

1984-05-24

1986-09-02

Rubinson, Gene Z.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358227, 354402, 354406, H04N 5238, H04N 5232

Patent

active

046099441

ABSTRACT:
An automatic focus control system for a video camera comprises a main optical system for conducting light from an object and including an adjustable diaphragm for adjusting the amount of light conducted therethrough, a beam splitter disposed in the main optical system for diverting a portion of the light from the main optical system into an optical subsystem which has a second adjustable diaphragm for adjusting the amount of light conducted through the optical subsystem, a converter for converting the portion of the light diverted through the optical subsystem into focusing signals, and an automatic focus control circuit including a contrast detecting circuit for detecting a focused state of the light from the object in response to the focusing signals.

REFERENCES:
patent: 4240726 (1980-12-01), Wick
patent: 4414575 (1983-11-01), Yamamoto et al.
patent: 4420773 (1983-12-01), Toyoda et al.

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