Non-spherical single lens

Details Non-spherical single lens Non-spherical single lens

1986-02-18

1988-03-08

Corbin, John K.

G02B 1318

Patent

active

047296453

ABSTRACT:
A non-spherical single lens comprises a first surface which is a non-spherical surface, the first surface being substantially zero in the curvature thereof near the optic axis and being of a non-spherical shape gradually displaced outwardly away from the optic axis, and a second surface which is a convex spherical surface of a radius of curvature r, .vertline.r.vertline. being a value equal or approximate to d which is the thickness of the lens.

REFERENCES:
patent: 2730925 (1956-01-01), Kavanagh
patent: 4657352 (1987-04-01), Suda et al.

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