Zoom lens system

Details Zoom lens system Zoom lens system

2006-11-28

2006-11-28

Ben, Loha (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000, C359S676000

Reexamination Certificate

active

07142370

ABSTRACT:
The object is to provide an afocal zoom lens system with the f-number of about 4 or less capable of performing vibration reduction correction. The system includes, in order from an object, a first group G1being positive, a second group G2being negative, a third group G3being positive, and a fourth group G4being positive. Zooming is performed by moving the second and third groups along the optical axis. The fourth group G4is composed of a front group G4F being positive, a middle group G4M being negative, and a rear group G4R being positive. Vibration reduction is performed by shifting the middle group G4M perpendicular to the optical axis. The first group G1consists of a first front group G1f being fixed, a first middle group G1m being movable, and a first rear group G1r being fixed. Focusing is performed by moving G1m along the optical axis.

REFERENCES:
patent: 4398807 (1983-08-01), Iizuka
patent: 4687303 (1987-08-01), Takahashi et al.
patent: 5134524 (1992-07-01), Hamano et al.
patent: 5223979 (1993-06-01), Yoneyama
patent: 5233471 (1993-08-01), Nakamura et al.
patent: 5430576 (1995-07-01), Hamano
patent: 5638216 (1997-06-01), Horiuchi et al.
patent: 5721641 (1998-02-01), Aoki
patent: 5754346 (1998-05-01), Nakayama et al.
patent: 5963378 (1999-10-01), Tochigi et al.
patent: 6058269 (2000-05-01), Tsutsumi
patent: 6324018 (2001-11-01), Kawamura
patent: 6433938 (2002-08-01), Kawamura
patent: 6462885 (2002-10-01), Nishio
patent: 6560016 (2003-05-01), Usui et al.
patent: 6646803 (2003-11-01), Hayakawa et al.
patent: 6646804 (2003-11-01), Harada
patent: 6693750 (2004-02-01), Sato
patent: 6891680 (2005-05-01), Sato
patent: 2002/0101661 (2002-08-01), Harada
patent: 2003/0133200 (2003-07-01), Sato
patent: 10-90599 (1998-04-01), None
patent: 2002-162564 (2002-06-01), None

Affiliated with

Also associated with

Rating

Zoom lens system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Zoom lens system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3638342