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Proceedings Paper

Folded zoom lenses: a review of patent literature
Author(s): Daniel J. Reiley
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Paper Abstract

Folded zoom lenses offer an interesting opportunity for a review of patent literature: they are of a reasonable complexity that the designs are likely to be instructive, they offer a small range of design constraints because of the standardization of CMOS imager sizes and the mechanical constraints imposed on DSC cameras, and there is enough recent activity in awarded patents that a representative sample of contemporary designs can be collected. This paper presents a review of recent patent literature for folded zoom lenses. Zemax models were built for the designs disclosed in 67 patents. For this large set of models, the distribution of paraxial properties and lens materials is presented. For the most-common design constraints, two particularly-similar disclosed designs are compared in detail. Engineering differences between the two disclosed designs are compared to differences in patent claims directed to the disclosed designs; the patents’ claims are shown to omit, at least for these two patents, some design differences that seem important from an engineering point of view.

Paper Details

Date Published: 17 December 2014
PDF: 7 pages
Proc. SPIE 9293, International Optical Design Conference 2014, 92931O (17 December 2014); doi: 10.1117/12.2071277
Show Author Affiliations
Daniel J. Reiley, California Institute of Technology (United States)


Published in SPIE Proceedings Vol. 9293:
International Optical Design Conference 2014
Mariana Figueiro; Scott Lerner; Julius Muschaweck; John Rogers, Editor(s)

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