Lens driving controller

Details Lens driving controller Lens driving controller

1999-06-09

2000-08-15

Perkey, W. B.

Photography

With exposure objective focusing means, focusing aid, or...

Lens drive circuit or motor structure

G03B 1334

Patent

active

061048801

ABSTRACT:
A lens driving controller has a driving mechanism for driving a lens along an optical axis, a calculator for obtaining a lens driving amount to an in-focus position, and a detector for detecting a position of the lens. The controller drives the lens in an in-focus direction in accordance with a lens driving amount obtained by the calculator, drives the lens in an opposite direction when the lens reaches a first lens position where a remaining driving amount to the in-focus position is a predetermined value, obtains information on a second lens position when the lens actually starts to move in the opposite direction, obtains a lens movement amount from the first lens position and the second lens position and performs remaining driving to the in-focus position and stop control based on an obtained lens movement amount.

REFERENCES:
patent: 4509842 (1985-04-01), Taniguchi et al.
patent: 4894676 (1990-01-01), Ohnuki et al.
patent: 5057859 (1991-10-01), Ishimaru
patent: 5239331 (1993-08-01), Kobe et al.
patent: 5887201 (1999-03-01), Maeno

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