Zoom lens employing plastic lenses

Details Zoom lens employing plastic lenses Zoom lens employing plastic lenses

1994-12-30

1996-08-13

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

055462316

ABSTRACT:
A zoom lens includes, in the order named from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, which is movable along an optical axis of the zoom lens in accordance with a magnification change, a fixed third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, which is movable along the optical axis, to compensate for a positional change of an image plane according to the magnification change. The fourth lens group includes at least two positive lenses and at least one negative lens. At least two lenses constituting the fourth lens group are made from plastic lenses which are cemented together.

REFERENCES:
patent: 5100223 (1992-05-01), Ono
patent: 5134524 (1992-07-01), Hamano
patent: 5191476 (1993-03-01), Sato
patent: 5218476 (1993-06-01), Ito
patent: 5285316 (1994-02-01), Miyano
patent: 5396367 (1995-03-01), Ono
patent: 5424869 (1995-06-01), Nanjo

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1053231