Single lens having one aspherical surface

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

1984-03-14

1987-05-26

Corbin, John K.

350417, G02B 1318, G02B 2610

Patent

active

046680560

ABSTRACT:
A single lens is described for forming 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 selected to compensate for aberrations caused by the substrate.

REFERENCES:
patent: 3917766 (1975-11-01), Howden
patent: 4074314 (1978-02-01), Velzel et al.
patent: 4415238 (1983-11-01), Braat et al.

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