Optical: systems and elements – Lens – Multiple component lenses
Patent
1997-11-05
1999-06-01
Epps, Georgia
Optical: systems and elements
Lens
Multiple component lenses
359646, 359717, 359741, G02B 904
Patent
active
059093226
ABSTRACT:
According to the present invention the magnifier lens comprises two lens elements. More specifically, from a front, eye side to a rear, object side there is a front, positive lens element, and a rear, meniscus lens element. The front, positive power lens element has at least one aspheric surface and an Abbe V-number V.sub.1. The rear, meniscus lens element has an Abbe V-number V.sub.2. The front and the rear lens elements, in combination, contain at least one diffractive surface. The rear, meniscus lens element has front and rear refractive surfaces, both of which are concave toward the object side. The rear refractive surface is positionable within 5 mm of an associated object to be viewed from the eye side. This rear surface is an aspheric surface of negative refractive power. The Abbe V-numbers satisfy the following inequalities 50.4<V.sub.1 <65, 25.4<V.sub.2 <40, and V.sub.1 -V.sub.2 >25.
REFERENCES:
patent: 4094585 (1978-06-01), Betensky
patent: 5216545 (1993-06-01), Saito
patent: 5440197 (1995-08-01), Gleckman
Cyberdisplay.TM. 320 Monochrome Display Specifications, Kopin Corp., pp. 3-19 through 3-20.
Military Standardization Handbook, Optical Design, Handbook No. 141, Oct. 5, 1962, pp. 14-4 through 14-19.
Eastman Kodak Company
Epps Georgia
Schwartz Jordan M.
Short Svetlana Z.
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