Optical: systems and elements – Lens – Eyepiece
Patent
1997-11-05
1999-03-23
Epps, Georgia
Optical: systems and elements
Lens
Eyepiece
359643, 359716, 359784, 359574, G02B 2500, G02B 302, G02B 912, G02B 518
Patent
active
058868259
ABSTRACT:
A magnifier lens comprises three lens elements. More specifically, from a front, eye side to a rear, object side there are a front positive lens element, a middle, negative power lens element and a rear, meniscus lens element. The front, positive power lens element has at least one aspheric surface. The front and the middle 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 surface is positioned within 5 mm of an object to be viewed from the eye side. This rear surface is an aspheric surface of negative power that corrects field curvature.
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Cyberdisplay .TM., 320 Monochrome Display Specifications, Kopin Corp. pp. 3-19 through 3-20. .COPYRGT.1997.
Military Standardization Handbook, Optical Design, Handbook number 141, Oct. 5, 1962 pp. 14-4 through 14-19.
Eastman Kodak Company
Epps Georgia
Lester Evelyn A.
Short Svetlana Z.
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