Motor-driven auto-focusing system

Details Motor-driven auto-focusing system Motor-driven auto-focusing system

1998-02-11

2000-04-25

Perkey, W. B.

Photography

Having variable focal length of camera objective

Having focus operation

396133, G03B 1336

Patent

active

060553782

ABSTRACT:
An auto-focusing device of a camera includes a photographic lens having a focusing lens group guided along an optical axis, a stepping motor for moving the focusing lens group along the optical axis to bring an object into focus; and a controller for controlling the stepping motor to rotate stepwise when the depth of focus is smaller than a predetermined value and for controlling the stepping motor to rotate the rotor by even-numbered steps when the depth of focus of the photographic lens is greater than the predetermined value.

REFERENCES:
patent: 5117137 (1992-05-01), Kobayashi
patent: 5126896 (1992-06-01), Yamagata
patent: 5298933 (1994-03-01), Chigira
patent: 5594311 (1997-01-01), Yasuda et al.

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