Zoom lens and electronic still camera using it

Details Zoom lens and electronic still camera using it Zoom lens and electronic still camera using it

2005-08-02

2005-08-02

Perkey, W. B. (Department: 2851)

Photography

Having variable focal length of camera objective

Having focus operation

C348S240300, C359S684000, C359S689000

Reexamination Certificate

active

06925253

ABSTRACT:
A zoom lens comprising, disposed in order from an object side to an image surface side, a negative-power first lens group, a diaphragm, a positive-power second lens group, and a positive power third lens group, characterized in that, when zooming from a wide-angle end to a telelscope end, an air gap between the first lens group and the second lens group shrinks and an air gap between the second lens group and the third lens group expands, the third lens group is movable in an optical axis direction for focusing, and a zoom ratio at a shooting distance of ∞ is 2.5- to 3.2-magnification.

REFERENCES:
patent: 5666232 (1997-09-01), Toyama
patent: 5715097 (1998-02-01), Shibayama et al.
patent: 5872660 (1999-02-01), Kohno et al.
patent: 5991091 (1999-11-01), Hayakawa
patent: 6124984 (2000-09-01), Shibayama et al.
patent: 6169635 (2001-01-01), Ozaki et al.
patent: 6308011 (2001-10-01), Wachi et al.
patent: 6614599 (2003-09-01), Watanabe
patent: 6654180 (2003-11-01), Ori
patent: 6671103 (2003-12-01), Itoh
patent: 1 096 287 (2001-05-01), None
patent: 1 103 834 (2001-05-01), None
patent: 2-118509 (1990-05-01), None
patent: 6-94996 (1994-04-01), None
patent: 7-63992 (1995-03-01), None
patent: 8-111804 (1996-04-01), None
patent: 8-327907 (1996-12-01), None
patent: 9-21950 (1997-01-01), None
patent: 9-258103 (1997-10-01), None
patent: 10-39214 (1998-02-01), None
patent: 10-170826 (1998-06-01), None
patent: 11-52245 (1999-02-01), None
patent: 11-52246 (1999-02-01), None
patent: 11-223768 (1999-08-01), None
patent: 11-287953 (1999-10-01), None
patent: 2000-89110 (2000-03-01), None
patent: 2000-231149 (2000-08-01), None
patent: 2000-298235 (2000-10-01), None
patent: 2001-033702 (2001-02-01), None
patent: 2001-66503 (2001-03-01), None
patent: 2001-100098 (2001-04-01), None
Kimura K. et al., “Application of aberration theory to image stabilizing systems”,19th Optics Symposium Proceedings, 1994, pp 47-50, with English Translation.
Matsui Y., “Theory of Decentred Optical System and Its Application”,Kogaku, Dec. 1995, vol. 24(12), pp 708-712, with English Translation.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3462883