Image pick-up lens system

Details Image pick-up lens system Image pick-up lens system

2007-02-20

2007-02-20

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S739000, C359S793000, C359S794000, C359S795000

Reexamination Certificate

active

10977845

ABSTRACT:
An image pick-up lens system includes an aperture stop (10), a biconvex first lens (20), and a meniscus-shaped second lens (30) having a concave surface on a side of an object. The aperture stop, the first lens and the second lens are aligned in that order from the object side to an image side. Each of the lenses has at least one aspheric surface, and at least one of the lenses is made from an optical glass. The system satisfies the following condition: (1) 1<T/f<1.6, wherein f is a focal length of the system, and T is a length from the aperture stop to an image pick-up surface of the image side. The first condition (1) limits the total length of the system in order to provide compactness. The system also satisfies other conditions (2)–(6) as disclosed, in order to provide compactness, improved optical performance, and cost-effectiveness.

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