Zoom lens and camera having the same

Details Zoom lens and camera having the same Zoom lens and camera having the same

2005-03-08

2005-03-08

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S687000, C359S684000

Reexamination Certificate

active

06865027

ABSTRACT:
This specification discloses a zoom lens having good optical performance over the whole of an object distance from an infinity object to a super-close range object. This zoom lens system comprises, in order from the front to the rear, a first lens unit of positive optical power, a second lens unit of negative optical power, and a following lens component of positive optical power as a whole. During zooming, the first lens unit moves so that the interval between the first lens unit and the second lens unit may become great at the telephoto end relative to the wide angle end. At least one lens unit moves for focusing resulting from a change in an object distance, and the lens unit moving for the focusing is provided with a diffractive optical surface.

REFERENCES:
patent: 5044706 (1991-09-01), Chen
patent: 5268790 (1993-12-01), Chen
patent: 5299064 (1994-03-01), Hamano et al.
patent: 5790321 (1998-08-01), Goto
patent: 5978153 (1999-11-01), Nishio
patent: 6577450 (2003-06-01), Hamano et al.
patent: 6606200 (2003-08-01), Nakayama et al.
patent: 4-301811 (1992-10-01), None

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3400689