Zoom lens

Details Zoom lens Zoom lens

1996-04-29

1998-03-24

Nelms, David C.

Optical: systems and elements

Lens

With multipart element

359683, G02B 308

Patent

active

057319146

ABSTRACT:
A wide angle zoom lens suitable for use in cameras for providing sufficiently wide range of field angles to cover a frame of a film in the camera provides performance comparable to zoom lenses having more elements. The wide angle zoom lens has four elements in three groups which are moveable with respect to each other. The front group has a diffractive lens formed on a curved surface thereof. The second or intermediate group and the front group has surfaces are aspheres for aberration correction as does a surface of a single element third group. Chromatic aberration is corrected by the diffractive lens in combination with the lens of the other groups over the zoom range. The third group lens is formed with glass with lower dispersion (higher Abbe number) than the lenses of the other groups. The second group has two lenses one of which may be a low power, negative, meniscus lens which is made of plastic thereby further reducing the cost of the zoom lens.

REFERENCES:
patent: 4812023 (1989-03-01), Kikuchi
patent: 5013133 (1991-05-01), Buralli et al.
patent: 5078513 (1992-01-01), Spaulding et al.
patent: 5260833 (1993-11-01), Ito et al.
patent: 5268790 (1993-12-01), Chen
patent: 5353160 (1994-10-01), Ogata

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2293571