Title:
DRIVING METHOD FOR ZOOM LENS DEVICE, IMAGE PICKUP DEVICE USING THE METHOD, AND MOBILE INFORMATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2008/056512
Kind Code:
A1
Abstract:
When focal lengths are discretely set, with respect to a focal length (fr) at the position
where the moving direction of a second lens group (G2) or a correction group is
inverted, the individual zoom positions are so set that the value of the difference
between a focal length (f4) the closest to the focal length (fr) and a next focal
length (f5) on the wide end between a focal length (fw) of the second lens group
(G2) and the focal length (fr) may be larger than the differences between the remaining
adjoining focal. By thus moving directly from the zoom position of the focal
length (f4) to the zoom position of the focal length (f5), the moving range (Lm)
of the second lens group (G2) can be made smaller than the moving range (Lr) of the
case, in which the lens position at the focal length (fr) is set as the zoom position.
As a result, the stroke of the lens driving device can be shortened, and a first
lens group (G1) can be brought closer to the second lens group (G2), so that the
whole length of the zoom lens can be designed to be short.
Inventors:
UEDA MINORU
Application Number:
PCT/JP2007/070125
Publication Date:
May 15, 2008
Filing Date:
October 16, 2007
Export Citation:
Assignee:
SHARP KK (JP)
UEDA MINORU
UEDA MINORU
International Classes:
G02B7/08; G02B15/16
Foreign References:
| JP2000081571A | 2000-03-21 | |||
| JPH06230281A | 1994-08-19 | |||
| JP2004012504A | 2004-01-15 | |||
| JPH03158817A | 1991-07-08 |
Attorney, Agent or Firm:
TANAKA, Mitsuo et al. (IMP Building3-7, Shiromi 1-chome,Chuo-ku, Osaka-sh, Osaka 01, JP)
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