Optical System Design

Design of wide-angle lenses for wireless capsule endoscopes

[+] Author Affiliations
Ou-Yang Mang

National Central University,Institute of Optical Sciences, No. 300, Jhongda Road, Jhongli City, Taoyuan County, Taiwan

Shih-Wei Huang

National Central University,Institute of Optical Sciences, No. 300, Jhongda Road, Jhongli City, Taoyuan County, Taiwan

Yung-Lin Chen

National Central University,Institute of Optical Sciences, No. 300, Jhongda Road, Jhongli City, Taoyuan County, Taiwan

Hsin-Hung Lee

National Central University,Institute of Optical Sciences, No. 300, Jhongda Road, Jhongli City, Taoyuan County, Taiwan

Ping-Kuo Weng

Chung-Shan Institute of Science & Technology,Lung-Tan Post Box 90008-8, Taiwan

Opt. Eng. 46(10), 103002 (October 15, 2007). doi:10.1117/1.2795627
History: Received September 10, 2006; Revised April 27, 2007; Accepted April 27, 2007; Published October 15, 2007
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Use of the capsule endoscope to inspect the digestive system, and in particular the intestine, for pathological change has recently been a great breakthrough in medical engineering. Some problems, however, need to be overcome. The field of view is not wide enough, and the image quality is not good enough. These drawbacks cause unclear and ambiguous digestive disease examinations by medical professionals. In order to solve these problems, the paper proposes a novel design for miniature lenses with a wide-angle field of view and good imaging quality. The lenses employed in the capsule endoscope would consist of a plastic aspheric lens and a glass lens, in a capsule 9.8mm(W)×9.8mm(L)×10.7mm(H), associated with white LED light sources and a 256×256 CMOS array sensor of 10-μm pixel size. Experimental results prove that the lens field of view can be made as large as 86deg, and the modulation transfer function for field of view 0deg can be made 78.2% at 50-lpmm spatial frequency and 53.3% at 100lpmm. Tolerance analysis shows that our design is feasible for manufacture, and consistent with the finished prototype.

Figures in this Article
© 2007 Society of Photo-Optical Instrumentation Engineers

Topics

Lenses ; Endoscopes

Citation

Ou-Yang Mang ; Shih-Wei Huang ; Yung-Lin Chen ; Hsin-Hung Lee and Ping-Kuo Weng
"Design of wide-angle lenses for wireless capsule endoscopes", Opt. Eng. 46(10), 103002 (October 15, 2007). ; http://dx.doi.org/10.1117/1.2795627


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