Design for manufacture of a varifocal rotation optics
| Autor: | Peter F. Stiller, Daniel Moser, Ingo Sieber, Ulrich Gengenbach |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
business.industry Physics::Optics 02 engineering and technology Optical refraction Curvature 01 natural sciences Design for manufacturability 010309 optics Azimuth Optical axis 020210 optoelectronics & photonics Optics Discontinuity (geotechnical engineering) Imaging quality 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Surface structure business |
| Zdroj: | Optical Design and Engineering VII. |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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