Automatic focusing device

Details Automatic focusing device Automatic focusing device

1989-06-09

1990-08-28

Adams, Russell E.

354402, 354286, G03

Patent

active

049529625

ABSTRACT:
Disclosed herein is an automatic focusing device high in focusing accuracy, in which an amount of drive for driving a focusing lens to a position focused on an object can be renewed during the focusing lens moving to the focused position. Further, the automatic focusing device is provided with a speed changing means capable of changing the movement speed of the focusing lens according to an amount of drive to the focused position.

REFERENCES:
patent: 4303321 (1981-12-01), Enomoto et al.
patent: 4550994 (1985-11-01), Maruyama
patent: 4705380 (1987-11-01), Yamamoto et al.
patent: 4728980 (1988-03-01), Nakamura et al.
patent: 4743931 (1988-05-01), Matsuzaki et al.
patent: 4745425 (1988-05-01), Kusuka
patent: 4772909 (1988-09-01), Ogasawara
patent: 4837594 (1989-06-01), Nakamura et al.
Lens Driving by Micro-Processor-Controlled DC Motor by Hamada & Ishikawa Minolta Techno Report Special Issue 1986, pp. 53-58.

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