Single lens having one aspherical surface

Details Single lens having one aspherical surface Single lens having one aspherical surface

G - Physics

02

B

88/99

G02B 3/04 (2006.01) G11B 7/135 (2006.01)

Patent

CA 1255527

22 ABSTRACT: "Single lens having one aspherical surface." A single lens is described for the formation of a scanning spot on an information surface of a transparent record-carrier substrate. The lens has one aspherical surface and one spherical or plane surface. The curvatures of the lens surfaces and the thickness of the lens are such that a compensation is obtained for aberrations caused by the substrate.

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