Optical magnifier

Details Optical magnifier Optical magnifier

1995-11-27

1997-12-30

Sugarman, Scott J.

Optical: systems and elements

Lens

Eyepiece

359558, 359717, G02B 2500, G02B 1318, G02B 2742

Patent

active

057037213

ABSTRACT:
An optical magnifier, preferably having only two elements and including a rear negative surface associated with an object to be viewed, which is aspheric. The aspheric surface follows a formula having a sag which is positive to help effect correction for field curvature, astigmatism and distortion. Preferably the lens has at least one other aspheric surface and a diffractive surface. The diffractive surface is preferably on a curved surface to assist in improving the quality of the magnifier with a limited number of elements.

REFERENCES:
patent: 3975095 (1976-08-01), Minoura et al.
patent: 4094585 (1978-06-01), Betensky
patent: 4171872 (1979-10-01), Baker
patent: 4322135 (1982-03-01), Freeman
patent: 4469413 (1984-09-01), Shirayanagi
patent: 5260828 (1993-11-01), Londono et al.
patent: 5504628 (1996-04-01), Borchard
"Diffractive Optics Applied to Eyepiece Design," Michael D. Missig and G. Michael Morris, Diffractive Optics: Design, Fabrication, and Applications, 1994 Technical Digest Series vol. II, Jun. 6-9, 1994, pp. JMC5-1 through JMC5-4.

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