Zoom lens system

Details Zoom lens system Zoom lens system

2006-01-03

2006-01-03

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000, C359S684000, C359S685000, C359S715000, C359S740000, C359S774000

Reexamination Certificate

active

06982836

ABSTRACT:
A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group. Upon zooming, the second lens group moves from the object side to the image side, and the fourth lens group moves in order to compensate the move of the image plane. The fourth lens group includes sub-lens groups, wherein a first sub-lens group satisfies specific conditions. The first sub-lens group has an aspherical surface on at least the object-side surface thereof. The aspherical surface is formed so that the higher a height from the optical axis in a radial direction becomes the weaker the refractive power is, compared with a paraxial spherical surface.

REFERENCES:
patent: 4776680 (1988-10-01), Tanaka
patent: 5134524 (1992-07-01), Hamano et al.
patent: 5530592 (1996-06-01), Tochigi
patent: 5568321 (1996-10-01), Ogawa et al.
patent: 5583699 (1996-12-01), Nakayama
patent: 5748383 (1998-05-01), Ohtake
patent: 5754346 (1998-05-01), Nakayama et al.
patent: 5784205 (1998-07-01), Nakayama et al.
patent: 6084722 (2000-07-01), Horiuchi
patent: 6124983 (2000-09-01), Yahagi et al.
patent: 6128140 (2000-10-01), Yoneyama
patent: 6229962 (2001-05-01), Imamura
patent: 6449433 (2002-09-01), Hagimori et al.
patent: 6473231 (2002-10-01), Hamano et al.
patent: 6606194 (2003-08-01), Hamano et al.
patent: 6674580 (2004-01-01), Horiuchi
patent: 6754009 (2004-06-01), Horiuchi
patent: 6788464 (2004-09-01), Misaka
patent: 2003/0197950 (2003-10-01), Eguchi
patent: 2004/0056969 (2004-03-01), Hamano et al.
patent: 2901144 (1999-03-01), None
patent: 2000-075204 (2000-03-01), None
patent: 2000-171712 (2000-06-01), None
patent: 3097395 (2000-08-01), None
English language Abstract of JP 2000-075204.

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-3546838