| 摘要 |
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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