US 2007/0177278 A1 · Imaging lens

Abstract

The imaging lens is configured to include, in an order arranged from an object side: a first lens 101 having a substantially convex surface formed at the object side and having a positive refractive power; a second lens 102 constituted of a meniscus lens having a substantially concave surface formed at the object side and having a negative refractive power; a third lens 103 having substantially convex surfaces formed at both sides, respectively; and a fourth lens 104 constituted of a meniscus lens having a substantially convex surface at the object side and having a positive refractive power. Further, a space of at least 1.0 mm is ensured between the first lens 101 and the second lens 102. This allows a diaphragm mechanism 106 of a certain thickness having a diaphragm 105 to be arranged between the first lens 101 and the second lens 102.

Claims11

Dependent claims

An imaging lens comprising:

a first lens having a substantially convex surface, having a positive refractive power, and arrange so that the convex surface is on an object side;
a second lens composed of a meniscus lens having a substantially concave surface, having a negative refractive power, and arranged so that the concave surface is on the object side;
a third lens having substantially convex surfaces on both sides, and having a positive refractive power;
and
a fourth lens composed of a meniscus lens having a substantially convex surface, having a positive refractive power, and arranged so that the convex surface is on the object side, wherein
the first lens, the second lens, the third lens, and the fourth lens are arranged in order from the object side so that lens apertures are configured to be stepwise increased from the first lens toward the fourth lens, and
a space is provided between the first lens and the second lens.

4 more elements

Dependencies are inferred from the claim text.

Imaging lens

Life of this patent

Imaging lens

Life of this patent

Abstract

Claims11