Zoom lens for projecting video image

Details Zoom lens for projecting video image Zoom lens for projecting video image

1994-10-04

1997-02-04

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359687, G02B 1514

Patent

active

056004907

ABSTRACT:
A zoom lens comprising, in order from the large conjugate side, a first lens unit of positive refractive power, a second lens unit of negative refractive power and a third lens unit of positive refractive power, wherein when zooming from the shortest focal length to the longest focal length end, the air separations between the first and second lens units and between the second and third lens units increases and decreases monotonously, respectively, the first to third lens units each has at least one aspheric surface, and the following condition is satisfied:

REFERENCES:
patent: 5257134 (1993-10-01), Sugawara
patent: 5268793 (1993-12-01), Saka et al.
patent: 5311361 (1994-05-01), Nozawa

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