Patent ID: 9256057
Filing Date: 2016-02-09
CPC Classification: G02B

Claim Text:
1. A projection lens comprising a first lens group, a second lens group and a third lens group, all of which are arranged in sequence from a projection side to an image source side along an optical axis, wherein: the first lens group is with negative refractive power and comprises a first lens, a second lens, a third lens and a fourth lens, all of which are arranged in sequence from the projection side to the image source side along the optical axis; the second lens group is with positive refractive power and comprises a fifth lens and a sixth lens, both of which are arranged in sequence from the projection side to the image source side along the optical axis; and the third lens group is with positive refractive power and comprises a stop, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens and a twelfth lens, all of which are arranged in sequence from the projection side to the image source side along the optical axis.