Automatic focusing device wherein lens movement is controlled in

Details Automatic focusing device wherein lens movement is controlled in Automatic focusing device wherein lens movement is controlled in

1992-11-24

1995-03-28

Razavi, Michael T.

Television

Camera, system and detail

Optics

348356, 354402, H04N 5232

Patent

active

054021758

ABSTRACT:
An automatic focusing device including a focus detection circuit for detecting a focus state, and a motor for driving a focusing lens in accordance with an output from the focus detection circuit. The device controls the driving state of the motor in accordance with a result of comparing the amplitude of hunting of the focusing lens with a predetermined value when the direction of the drive of the focusing lens is reversed.

REFERENCES:
patent: 4473743 (1984-09-01), Ishikawa
patent: 4735494 (1988-04-01), Makino et al.
patent: 5005086 (1991-04-01), Iwamoto et al.
patent: 5212516 (1993-05-01), Yamada et al.
"Automatic focusing of a television camera by means of a montaineering servo method," NHK Giho (technical bulletin), vol. 17, No. 1 (serial No. 86), 1965, pp. 21-37.

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