Four zoom lens design for 3D laparoscope by using liquid lens

Seungwan Lee; Minseog Choi; Eunsung Lee; Kyu-Dong Jung; Jong-Hyeon Chang; Woonbae Kim

doi:10.1117/12.929515

19 October 2012 Four zoom lens design for 3D laparoscope by using liquid lens

Seungwan Lee, Minseog Choi, Eunsung Lee, Kyu-Dong Jung, Jong-Hyeon Chang, Woonbae Kim

Proceedings Volume 8488, Zoom Lenses IV; 848809 (2012) https://doi.org/10.1117/12.929515
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

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

Citation Download Citation

Seungwan Lee, Minseog Choi, Eunsung Lee, Kyu-Dong Jung, Jong-Hyeon Chang, and Woonbae Kim "Four zoom lens design for 3D laparoscope by using liquid lens", Proc. SPIE 8488, Zoom Lenses IV, 848809 (19 October 2012); https://doi.org/10.1117/12.929515

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