Patent ID: 7738190

Claim:
A wide-angle projection lens module comprising the following components in sequential order from an output side: (a) a first lens group with a convex aspheric reflective surface; (b) a second lens group of negative refractive power having at least one aspheric surface; (c) a third lens group of substantially zero refractive power, wherein an aperture stop of the wide-angle projection lens module lies within or near the third lens group; and (d) a fourth lens group of positive refractive power, wherein the following Conditions (1) to (4) are satisfied: 10<|F 1 /F|<30 Condition (1); 4.0<|F 2 /F|<8.0 Condition (2); 25<|F 3 /F|<50 Condition (3); and 3.5<|F 4 /F|<6 Condition (4), where: F is the focal length of the wide-angle projection lens module; F 1 is the focal length of the first lens group; F 2 is the focal length of the second lens group; F 3 is the focal length of the third lens group; and F 4 is the focal length of the fourth lens group.