| 摘要 |
A lens 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 aspheric surface ( 22 ) and a second aspheric surface ( 24 ). The second lens is concavo-convex, and includes a third aspheric surface ( 32 ) and a fourth aspheric surface ( 34 ). The third lens includes a wavelike fifth aspheric surface ( 42 ) and a wavelike sixth aspheric surface ( 44 ). All of the lens elements are made of glass. The lens has a compact volume, and provides stable imaging performance and good image quality.
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