Patent ID: 6239921
Filing Date: 2001-05-29
Classification: G02B

Abstract:
A taking lens system comprising, in order from an object side:a front lens unit composed of two lens elements, one of which is a positive glass lens element and the other of which is a negative plastic lens element;an aperture stop; anda rear lens unit having a positive plastic lens element disposed at an image-side end thereof,wherein the following condition is fulfilled:.vertline.f.times.fa/Ha.sup.2 +f.times.fb/Hb.sup.2.vertline..ltoreq.300wheref represents a focal length of the entire taking lens system;fa represents a focal length of the negative plastic lens element of the front lens unit;fb represents a focal length of the positive plastic lens element of the rear lens unit;Ha represents a height of incidence at which an axial F-number ray enters the negative plastic lens element of the front lens unit; andHb represents a height of incidence at which an axial F-number ray enters the positive plastic lens element of the rear lens unit.