Zoom lens system, interchangeable lens apparatus and camera...

Details Zoom lens system, interchangeable lens apparatus and camera... Zoom lens system, interchangeable lens apparatus and camera...

2010-01-29

2011-12-27

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S681000, C348S340000, C348S353000

Reexamination Certificate

active

08085475

ABSTRACT:
Provided is a zoom lens system including a compact focusing lens unit and having a suppressed change in image magnification at the time of movement of the focusing lens unit. A zoom lens system of the present invention, in order from an object side to an image side, includes, a first lens unit G1having negative optical power, a second lens unit G2having positive optical power, a third lens unit G3having positive optical power, and a fourth lens G4. Condition (10): 1.4<DL/YM<2.5 and condition (11): 1.2<BFW/YM<1.6 are satisfied (where, 100<2ωW<140, DL is an effective diameter of the lens surface closest to the image side, BFWis the back focus at a wide-angle limit, YM is the maximum image height at a wide-angle limit, and ωWis a half view angle (°) at a wide-angle limit).

REFERENCES:
patent: 6882369 (2005-04-01), Ito
patent: 2004/0125462 (2004-07-01), Misaka
patent: 2005/0013015 (2005-01-01), Sensui
patent: 2005/0162541 (2005-07-01), Ito
patent: 2005/0219708 (2005-10-01), Shibayama et al.
patent: 2005/0275949 (2005-12-01), Fujimoto et al.
patent: 2006/0050406 (2006-03-01), Ishii
patent: 2006/0203356 (2006-09-01), Fujimoto et al.
patent: 2006/0215279 (2006-09-01), Shibayama
patent: 2006/0221464 (2006-10-01), Shibayama et al.
patent: 2007/0024985 (2007-02-01), Misaka
patent: 2007/0229974 (2007-10-01), Shibayama et al.
patent: 2007/0297067 (2007-12-01), Muramatsu et al.
patent: 2008/0055461 (2008-03-01), Ito
patent: 2008/0056699 (2008-03-01), Ito
patent: 2008/0144189 (2008-06-01), Iwasawa et al.
patent: 2008/0285146 (2008-11-01), Shirasuna
patent: 2010/0194930 (2010-08-01), Miyazaki et al.
patent: 2000-111789 (2000-04-01), None
patent: 2000-333064 (2000-11-01), None
patent: 2001-004920 (2001-01-01), None
patent: 2001-188171 (2001-07-01), None
patent: 2004-198529 (2004-07-01), None
patent: 2005-049843 (2005-02-01), None
patent: 2005-284097 (2005-10-01), None
patent: 2005-316396 (2005-11-01), None
patent: 2005-352057 (2005-12-01), None
patent: 2006-78535 (2006-03-01), None
patent: 2006-221092 (2006-08-01), None
patent: 2006-267425 (2006-10-01), None
patent: 2007-219315 (2007-08-01), None
patent: 2008-003195 (2008-01-01), None
patent: 2008-015251 (2008-01-01), None
patent: 2008-046208 (2008-02-01), None
patent: 2008-145967 (2008-06-01), None
patent: 2008-233284 (2008-10-01), None
patent: 2008-281917 (2008-11-01), None

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4295055