Projection lens

Details Projection lens Projection lens

1999-06-25

2000-11-07

Sugarman, Scott J.

Optical: systems and elements

Lens

With field curvature shaping

359714, G02B 300

Patent

active

061444995

ABSTRACT:
The present invention relates to a projection lens including: a power lens unit; one or more image-side lens units, provided on the image side with respect to the power lens, for correcting an aberration; and one or more opposite-image-side lens units, provided on the side opposite to the image side with respect to the power lens, for correcting an aberration, which projection lens has the following features. That is, the power lens unit includes a lens element made of a glass material having an Abbe number falling within a range from 50 to 75; the one or more image-side lens units include a lens element made of a plastic material having an Abbe number falling within a range from 20 to 35, and a lens element made of a plastic material having an Abbe number falling within a range from 50 to 60; and the one or more opposite-image-side lens units include a lens element made of a plastic material having an Abbe number falling within a range from 20 to 35, and a lens element made of a plastic material having an Abbe number falling within a range from 50 to 60.

REFERENCES:
patent: 5329363 (1994-07-01), Moskovich
patent: 5659424 (1997-08-01), Osawa et al.

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