Doublet lens, variable apex angle prism and deviation correction

Optical: systems and elements – Lens – Multiple component lenses

Patent

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Details

359554, 359837, G02B 904, G02B 2764, G02B 504

Patent

active

059093218

ABSTRACT:
A doublet lens which, on being inserted between the light rays, can perform deviation correction in an afocal state without its focal length being changed. The doublet lens is arranged so that, if the radius of curvature of the concave surface of a plano-concave lens 10X is r1, the refractive index of the plano-concave lens 10X is n1, the magnitude of a gap between the plano-concave lens and the plano-convex lens is .DELTA., the refractive index of the gap is n2, the radius of curvature of the convex surface of a plano-convex lens 10Y is r2 and the refractive index of the plano-convex lens 10Y is n3, the following relation: ##EQU1## is met. The angle between opposite planar surfaces is changed by rotating the plano-convex mirror, for example, of the doublet lens about its center of curvature as the center of rotation.

REFERENCES:
patent: 3884548 (1975-05-01), Linder
patent: 5140462 (1992-08-01), Kitagishi
patent: 5387999 (1995-02-01), Hayashi
patent: 5519538 (1996-05-01), Maruyama

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