Patent ID: 6101035
Filing Date: 2000-08-08
Classification: G02B

Abstract:
A triplet lens system, comprising:a first, positive lens element;a second, negative lens element; anda third, positive lens element,wherein at least one surface from among said first lens element, said second lens element or said third lens element is provided with a blazed zonal structure having a function of a positive diffractive lens, said zonal structure being formed on a surface of said second lens element which faces said third lens element, and wherein said second lens element is made of a resin, andthe triplet lens system satisfying the following condition:.nu.2.ltoreq..nu.1.ltoreq..nu.3,wherein .nu.1 represents an Abbe's number of said first lens element, .nu.2 represents an Abbe's number of said second lens element, and .nu.3 represents an Abbe's number of said third lens element.