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Design for manufacture of a varifocal rotation optics
Author(s): Ingo Sieber; Peter Stiller; Daniel Moser; Ulrich Gengenbach
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Paper Abstract

This paper presents the design of a novel varifocal freeform optics consisting of two lens bodies each with a helical-type surface structure of azimuthally varying curvatures. This arrangement allows for tuning the optical refraction power by means of a mutual rotation of the lens bodies around the optical axis. Thus, the refraction power can be tuned continuously in a defined range. The shape of the helical-type surfaces is formed by a change in curvature subject to the azimuthal angle α. At the transition of the azimuthal angle from α = 2π to α = 0, a surface discontinuity appears. Since this discontinuity will seriously affect the imaging quality, it has to be obscured. In the initial state, i.e. zero-degree rotation, the curvatures of the opposing surfaces result in a specific refraction power, which is constant over the entire circular aperture. Rotating one of the lens bodies by an angle φ around the optical axis will change the opposing curvatures and result in a change of refraction power. Two circular sectors with different tunable optical refraction powers are formed, thus resulting in a tunable bifocal optics. Obscuring the minor sector will result in a tunable monofocal rotation optics. In contrast to conventional tunable lens systems, where additional space for axial or lateral lens movement has to be allocated in design, rotation optics allowing for a more compact design. A simulative performance analysis of the rotation optics in dependence of the maximum rotation angle will be presented as well as an approach to design-for-manufacture.

Paper Details

Date Published: 5 June 2018
PDF: 9 pages
Proc. SPIE 10690, Optical Design and Engineering VII, 106901B (5 June 2018); doi: 10.1117/12.2311650
Show Author Affiliations
Ingo Sieber, Karlsruher Institut für Technologie (Germany)
Peter Stiller, Karlsruher Institut für Technologie (Germany)
Daniel Moser, Karlsruher Institut für Technologie (Germany)
Ulrich Gengenbach, Karlsruher Institut für Technologie (Germany)

Published in SPIE Proceedings Vol. 10690:
Optical Design and Engineering VII
Laurent Mazuray; Rolf Wartmann; Andrew P. Wood, Editor(s)

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