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Proceedings Paper

Four zoom lens design for 3D laparoscope by using liquid lens
Author(s): Seungwan Lee; Minseog Choi; Eunsung Lee; Kyu-Dong Jung; Jong-Hyeon Chang; Woonbae Kim
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Paper Abstract

Laparoscopic lens module that is capable of zooming is presented. The lens module has a high magnification and a high resolution such as four zoom and 2M pixels full HD image. The lens module consists of two lens sets to get 3-D images. Each lens module has several lenses less than conventional laparoscope but has 8 lenses and two liquid lenses. The total length of module is 19 mm long and the diameter is less than 5 mm. The separated distance of two lens center is 5 mm and two lens modules are inserted into the 11mm diameter laparoscope. The lens module is designed by Code V™ by using the 2M pixels CMOS sensor that the pixel size is 1.75 μm. The merit of this fluidic lens design is being convertible between a convex and concave shape. The effective focal length of zoom-out and zoom-in modes is 3.24 mm and 12.94 mm respectively. The modulation transfer function of zoom-out and zoom-in modes is 40% and 30% at 140 lp/mm frequency. We have a diffraction of element at near stop to improve image resolution. Also the resolution of zoom-in mode is improved by using liquid iris. The F-number of a two modes is 4.4 and 5.8 and the optical distortion is 10% and 0.5%. It is expected that the z-direction resolution by this laparoscope is less than 2 mm

Paper Details

Date Published: 19 October 2012
PDF: 9 pages
Proc. SPIE 8488, Zoom Lenses IV, 848809 (19 October 2012); doi: 10.1117/12.929515
Show Author Affiliations
Seungwan Lee, Samsung Advanced Institute of Technology (Korea, Republic of)
Minseog Choi, Samsung Advanced Institute of Technology (Korea, Republic of)
Eunsung Lee, Samsung Advanced Institute of Technology (Korea, Republic of)
Kyu-Dong Jung, Samsung Advanced Institute of Technology (Korea, Republic of)
Jong-Hyeon Chang, Samsung Advanced Institute of Technology (Korea, Republic of)
Woonbae Kim, Samsung Advanced Institute of Technology (Korea, Republic of)


Published in SPIE Proceedings Vol. 8488:
Zoom Lenses IV
Ellis I. Betensky; Takanori Yamanashi, Editor(s)

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