Automatic focusing device for a video camera

Details Automatic focusing device for a video camera Automatic focusing device for a video camera

1984-10-16

1986-11-04

Rubinson, Gene Z.

Facsimile and static presentation processing

Facsimile

Recording apparatus

354401, G01J 120

Patent

active

046212922

ABSTRACT:
An automatic focusing device for a video camera includes a projector for projecting an infrared ray used for measuring distances and a converging lens for focusing reflected infrared ray light from an object whose distance is to be measured. A light spot detector and a computer are provided for determining whether the video camera is in focus. A lens encoder is utilized to determine the position of a focusing lens and a lens driving unit moves the position of a photographic lens used for photographing the object forwardly or backwardly in dependence upon outputs from the lens encoder and computer so as to automatically focus the video camera in response to the infrared rays reflected from the object to be photographed.

REFERENCES:
patent: 2999436 (1961-09-01), Faulhaber
patent: 3652784 (1972-03-01), Wupper
patent: 4304487 (1981-12-01), Odone et al.
patent: 4441810 (1984-04-01), Momose
patent: 4445029 (1984-04-01), Nagaoka et al.
patent: 4494848 (1985-01-01), Ogawa
patent: 4522492 (1985-06-01), Masunaga

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