Projection lens

Details Projection lens Projection lens

1998-05-21

2000-06-27

Epps, Georgia

Optical: systems and elements

Lens

With field curvature shaping

359714, G02B 300, G02B 302

Patent

active

060813873

ABSTRACT:
A projection lens comprises 5 lenses in 5 groups including: a first-group lens that is a positive lens; a second-group lens that is a positive lens having the largest positive power (the inverse number of focal length) in the whole lens system; a third-group lens that is a positive lens; a fourth-group lens that is a positive lens; and a fifth-group lens that is a negative lens with its concave surface facing a screen side, in order from the screen side, wherein each lens of the first, third, fourth and fifth groups has at least one aspheric surface. The distance between the first-group lens and the second-group lens is relatively short, and the positive power in the fourth-group lens is relatively high. In the projection lens, an optical focal shift due to the temperature change in the fifth-group lens is hardly caused, and therefore a projection lens with minimal distortion aberration can be provided at a low cost.

REFERENCES:
patent: 5329363 (1994-07-01), Moskovich
patent: 5357373 (1994-10-01), Yoshioka et al.
patent: 5440429 (1995-08-01), Kim
patent: 5572364 (1996-11-01), Toide et al.
patent: 5808804 (1998-09-01), Moskovich

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