5 June 2018 Design for manufacture of a varifocal rotation optics
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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.
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Ingo Sieber, Ingo Sieber, Peter Stiller, Peter Stiller, Daniel Moser, Daniel Moser, Ulrich Gengenbach, Ulrich Gengenbach, } "Design for manufacture of a varifocal rotation optics", Proc. SPIE 10690, Optical Design and Engineering VII, 106901B (5 June 2018); doi: 10.1117/12.2311650; https://doi.org/10.1117/12.2311650
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