1988-05-09
1990-08-07
Henry, Jon W.
350447, 350573, G02B 960, G02B 2324
Patent
active
049462679
ABSTRACT:
An endoscope relay optics design that reduces the number of air surfaces while maintaining high levels of correction. A lens assembly for incorporation into an optical transfer system (where two such assemblies define an optical transfer module for transferring an image between successive image planes) is of unitary construction. The assembly comprises five elements including a central rod-like element of high index material, a pair of negative elements of relatively low index, high dispersion material cemented to opposite ends of the central element, and a pair of positive end elements of high index, low dispersion material cemented to the negative elements. The powers of the elements are determined by requiring the Petzval sum to assume a desired low value, with index difference being the primary contributor to the correction. The two exposed surfaces are flat or mildly concave and include an aspheric component to correct spherical aberration.
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Proceedings of the OSA; (Hoogland) International Lens Design Conference; SPIE vol. 237; Systematics of Photographic Lens Types; 1980.
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