Lens having a diffractive surface

Details Lens having a diffractive surface Lens having a diffractive surface

2005-11-23

2008-05-20

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S716000, C359S738000

Reexamination Certificate

active

07375907

ABSTRACT:
A lens system (46) that can be used in a digital camera includes, in sequence, a first lens element (20), a second lens element (30) and a third lens element (40). The first lens element is biconvex and includes a first spherical surface (22) and a second spherical surface (24). The second lens is concavo-convex and includes a first aspheric surface (32) and a second aspheric surface (34). The first aspheric surface is a diffractive surface. The third lens includes a wave-shaped third aspheric surface (42) and a wave-shaped fourth aspheric surface (44). The lens has a compact volume and provides stable imaging performance and good image quality.

REFERENCES:
patent: 7167323 (2007-01-01), Isono
patent: 7239458 (2007-07-01), Zeng et al.
patent: 2004/0179275 (2004-09-01), Takeuchi et al.
patent: 2005/0237633 (2005-10-01), Nagai et al.
patent: 02258384.X (2003-10-01), None

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