Patent ID: 9625689
Date: 2017-04-18
CPC Classifications: G02B,G03B,Y10T

Claim:
1. An image-forming lens comprising, in order from an object side: a first lens group; a second lens group having negative refractive power; and a third lens group having positive refractive power, the second lens group being disposed movably in a direction including a component perpendicular to an optical axis, a most object side lens in the first lens group being a negative meniscus lens having a convex surface facing the object side, and the following conditional expressions being satisfied: where f denotes a focal length of the image-forming lens upon focusing on an infinitely distant object, f 1 denotes a focal length of the first lens group, and f 23 denotes a combined focal length of the second lens group and the third lens group upon focusing on an infinitely distant object.