Automatic focusing system for use in cameras having zooming func

Details Automatic focusing system for use in cameras having zooming func Automatic focusing system for use in cameras having zooming func

1989-05-19

1990-11-06

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Recording apparatus

358210, H04N 5232

Patent

active

049690442

ABSTRACT:
There is disclosed herein an automatic focusing system including an optical system having a focus lens, a zoom lens and an image pickup device for converting a light beam from an object into a corresponding electrical signal. The automatic focusing system comprising a filter for deriving a predetermined component of the electrical signal, a detector for detecting a focus voltage of the predetermined component and a drive circuit for moving the focus lens and zoom lens in the directions of the optical axis of the optical system. Also included in the focusing system is a control unit which moves the focus lens through the drive circuit to bring the focus lens into the fous positon and, when the focus position is not taken in a predetermiend movable range, moves the zoom lens toward the wide-angle side before again moving the focus lens so as to take the focus position.

REFERENCES:
patent: 4609944 (1986-09-01), Nakada et al.
patent: 4621292 (1986-11-01), Hirao et al.
patent: 4631590 (1986-12-01), Yamada et al.
patent: 4706124 (1987-11-01), Baba et al.
patent: 4717959 (1988-01-01), Isago
patent: 4735494 (1988-04-01), Makino et al.
patent: 4740820 (1988-04-01), Kinoshita
patent: 4762986 (1988-08-01), Suda et al.

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