Optical: systems and elements – Lens – Including a nonspherical surface
Patent
1992-03-30
1994-07-05
Arnold, Bruce Y.
Optical: systems and elements
Lens
Including a nonspherical surface
359717, 359740, 359793, 359794, G02B 302, G02B 904
Patent
active
053272919
ABSTRACT:
A lens system for a folding reflex camera is provided. The system includes: (a) a first group on the object side of the system's stop which (i) has a positive dioptric power, (ii) includes an aspheric surface, and (iii) has a concave surface adjacent to the stop; and (b) a second group on the image side of the stop consisting of either a single positive component or the combination of a single positive component and one or more focusing elements. The system includes at least two elements made of materials differing in dispersive powers where at least one of the elements is of plastic. The system can comprise just two plastic elements and even with such a simple configuration achieves excellent optical performance including a relatively flat field, relatively low distortion, and at least partial correction for lateral chromatic aberration.
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"The Triplet Lens and Its Modifications", -R. Kingslake, A History of the Photographic Lens, Academic Press, Inc., Chapter 7, pp. 103-115, 1989.
Baker James G.
Plummer William T.
Tassell Jon Van
Arnold Bruce Y.
Caufield Francis J.
Phan James
Polaroid Corporation
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