Patent ID: 9261678
Filing Date: 2016-02-16
CPC Classification: G02B

Claim Text:
1. A wide angle lens consisting of: a first lens group having negative refractive power as a whole; a second lens group having positive refractive power as a whole; and a third lens group having positive refractive power as a whole in this order from an object side, wherein a stop is included between the second lens group and the third lens group, and wherein the first lens group consists of a positive meniscus lens with its convex surface facing the object side and three negative meniscus lenses, each with its convex surface facing the object side, in this order from the object side, and wherein the second lens group includes at least two cemented lenses of a 21st cemented lens and a 22nd cemented lens, and wherein the third lens group consists of a 3a-th lens group consisting of a positive meniscus lens with its convex surface facing the object side and a 3b-th lens group that includes at least two cemented lenses of a 31st cemented lens and a 32nd cemented lens and has positive refractive power as a whole, in this order from the object side.