IMAGE PICKUP LENS

摘要

An image pickup lens includes a first lens with positive refractive power having a convex object side surface, an aperture stop, a second lens with negative refractive power having a convex image side surface, a third lens with positive refractive power having a concave image side surface, a fourth lens with positive refractive power having a convex image side surface, and a fifth lens with negative refractive power as a double-sided aspheric lens having a concave image side surface near the optical axis;
wherein the first lens and the second lens satisfy following conditional expressions (1) and (2);;50<ν1<85  (1);20<ν2<35  (2);where ν1 represents an Abbe number of the first lens, and ν2 represents an Abbe number of the second lens, and where the second lens satisfies a following conditional expression (3);;1.55

主权项

1. An image pickup lens composed of five lenses for a solid imaging element, comprising, in order from an object side to an image side,
a first lens having a positive refractive power and a convex surface facing the object side, a second lens as a meniscus lens having a negative refractive power, a third lens having a positive refractive power and a concave surface facing the image side, a fourth lens having a concave surface facing the object side, and a fifth lens having both sides formed as aspherical surfaces and having a negative refractive power and having concave surfaces facing the object side and the image side near an optical axis; wherein a conditional expression (12) below is satisfied:
−0.986≦f2/f<−0.7  (12) Where f represents a focal length of the overall optical system of the image pickup lens, and f2 represents a focal length of the second lens.