Patent ID: 6144499
Filing Date: 2000-11-07
Classification: G02B

Abstract:
A projection lens comprising: 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, whereinthe 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, andthe 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.