Patent ID: 6023375
Filing Date: 2000-02-08
Classification: G02B,H04N

Abstract:
A projection lens for forming an image of an object, said lens consisting in order from its image end to its object end of:(A) a first lens unit having a positive power and comprising in order from the image side to the object side:(i) a positive lens element;(ii) a negative lens element;(iii) a lens element of weak optical power; and(iv) a positive lens element of strong optical power; and(B) a second lens unit having a negative power; wherein:(a) the first lens unit and the second lens unit have a combined optical power P.sub.0 ;(b) the positive lens element of strong optical power has a power P.sub.E4 ; and(C) P.sub.E4 >1.5.multidot.P.sub.0.