An ultrashort throw ratio projection lens design based on a catadioptric structure

Hsiu Cheng Wang, Jui-Wen Pan*


研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)


In this paper, we present a rotational symmetry for an ultrashort throw (UST) lens with offset field. The UST lens has a throw ratio of 0.23 and a total track of 195 mm. The optical elements of the UST lens are comprised of two parts. First, a catadioptric projection lens where the catadioptric function permits reaching an ultrashort throw ratio, short total track, while at the same time requiring fewer lens elements. The second part is a collimating lens which takes advantage of the telecentric condition to generate uniform total internal reflection (TIR) in the TIR prism. With this design, an effective focal length of -1.96 mm and a f-number of 2.4 can be obtained. The root mean square spot size and lateral colour of all fields are smaller than one pixel in size. The maximum optical distortion of −0.97% and TV distortion of 0.2% are acceptable. In terms of image quality, the modulation transfer function (MTF) values for all fields are above 0.65 at 0.245 line pairs/mm. Even when the tolerance error is considered, the MTF values for all fields are still above 0.3. The suitability of the novel UST lens design for projection applications is discussed.

頁(從 - 到)1393-1403
期刊Journal of Modern Optics
出版狀態Published - 12 7月 2018
事件25th International Display Workshops, IDW 2018 - Nagoya, Japan
持續時間: 12 12月 201814 12月 2018


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