Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
May 20, 2008
Patent Application Number
11287126
Date Filed
November 23, 2005
Patent Primary Examiner
Patent 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.
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