Share Email Print
cover

Proceedings Paper

Design of an ultra-short throw catadioptric projection lens with a freeform mirror
Author(s): Yang Gao; Dewen Cheng; Chen Xu; Yongtian Wang
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

To meet the requirements of the current projection display system. This paper present an ultra-short throw catadioptric projection lens with a freeform mirror. This catadioptric structure consists of two parts. The first part is a set of rotationally symmetrical refractive lenses and the second part is a freeform mirror. In our design, Texas Instruments's Digital Light Processing (DLP) is chosen as the image source. A 0.65inch DMD is employed as the spatial light modulator. The two parts of system are firstly designed respectively, and then they are combined for final design. And a three-dimensional direct design method is firstly employed to design the freeform mirror. The final designed projection lens composes of nine lenses and a XY polynomial mirror, of which the F number is 3.5, the focal length is 6.05mm, and the screen size is 60inch. The designed system achieves projected the display screen with a projection distance of 440mm, which the throw ratio is 0.29. Results show that the MTF of all the FOVs are over 30% at 66lp/mm. The maximum distortion is less than 4%. Due to the high optical performance and compact structure, this designed projection lens is suitable for household and educational applications.

Paper Details

Date Published: 19 October 2016
PDF: 8 pages
Proc. SPIE 10154, Advanced Optical Design and Manufacturing Technology and Astronomical Telescopes and Instrumentation, 101540S (19 October 2016); doi: 10.1117/12.2246499
Show Author Affiliations
Yang Gao, Beijing Institute of Technology (China)
Dewen Cheng, Beijing Institute of Technology (China)
Chen Xu, Beijing Institute of Technology (China)
Yongtian Wang, Beijing Institute of Technology (China)


Published in SPIE Proceedings Vol. 10154:
Advanced Optical Design and Manufacturing Technology and Astronomical Telescopes and Instrumentation
Min Xu; Ji Yang, Editor(s)

© SPIE. Terms of Use
Back to Top