Optical: systems and elements – Lens – Multiple component lenses
Patent
1995-06-29
1997-01-21
Porta, David P.
Optical: systems and elements
Lens
Multiple component lenses
359785, G02B 914
Patent
active
055964559
ABSTRACT:
A Cooke triplet projection lens for use in overhead projectors comprises two outer positive elements of an ophthalmic crown glass and one inner negative element of a light flint glass. The crown glass has a refractive index of roughly 1.523 and an Abbe value of 58.5. The flint has an index of less than 1.573 and an Abbe value of between 43 and 53. One of the positive elements is biconvex; the other is meniscus.
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"Modern Optical Engineering: The Design of Optical Systems" by Warren J. Smith Copyright 1990 by McGraw-Hill, Inc., pp. 384-391 no month.
"Lens Design Fundamentals" by Rudolf Kingslake, Copyright 1978 by Academic Press, Inc., 111 Fifth Avenue, New York, New York 10003, pp. 286-295 no month.
Chernivec G. F.
Griswold Gary L.
Hanig Richard
Kirn Walter N.
Minnesota Mining and Manufacturing Company
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