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Proceedings Paper

Temperature-compensated plastic lens for visible light
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Paper Abstract

In many consumer and professional plastic lenses have potential applications because of cost, weight and aspherical shape. However they suffer from a big disadvantage: large amount of focal shift as function of temperature. In particular for bar code scanners, focal shifts due to temperature changes have huge impacts on the function of the scanner. One possibility to improve the temperature behavior of such lenses is to turn them into so- called hybrids: a combination of a refractive and a diffractive surface. This way a temperature compensation can be achieved that reaches the level of glass lenses. In this paper design and manufacturing considerations for such a lens will be given. This includes proper material choice and mechanical design. The lens is temperature compensated over a range from -230 degrees-+60 degrees C. Operating at 650 nm and having a focal length of 4 mm, makes it extra difficult to produce such a lens with sufficient image quality and diffraction efficiency. Results from the design will be compared with measured values from an injection molded sample of the designed lens. Quality parameter such as wavefront quality, focal shift with temperature and diffraction efficiency will be given.

Paper Details

Date Published: 27 August 1999
PDF: 9 pages
Proc. SPIE 3737, Design and Engineering of Optical Systems II, (27 August 1999); doi: 10.1117/12.360028
Show Author Affiliations
Stefan M. B. Baumer, Philips Ctr. for Manufacturing Technology (Netherlands)
Wim A. G. Timmers, Philips Plastic and Metalware Factories (Netherlands)
Mark Krichever, Symbol Technologies, Inc. (United States)
Vladimir Gurevich, Symbol Technologies, Inc. (United States)

Published in SPIE Proceedings Vol. 3737:
Design and Engineering of Optical Systems II
Fritz Merkle, Editor(s)

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