Patent ID: 8854701
Filing Date: 2014-10-07
Classification: G02B,H04N

Abstract:
1. An image-forming lens, comprising: in order from an object side to an image side a first group having a negative power as a whole, the first group consisting of a positive meniscus lens having a convex surface on the object side and a negative meniscus lens having a convex surface on the object side, the positive meniscus lens and the negative meniscus lens being cemented; an aperture stop; a second group consisting of a positive meniscus lens having a convex surface on the image side; a third group consisting of a positive meniscus lens having a convex surface on the image side; a fourth group consisting of a lens having a negative power; and a fifth group consisting of a biconcave lens, wherein a backfocus BF, an entire length of the image-forming lens L, a focal length of e-line of the first group f