Design of an 8x Four-group Inner-focus Zoom System Using a Focus Tunable Lens

다국어 초록 (Multilingual Abstract)

This study presents an 8x four-group inner-focus zoom lens with one-moving group for a compactcamera by use of a focus tunable lens (FTL). In the initial design stage, we obtained the powers of lensgroups by paraxial design based on thin lens theory, and then set up the zoom system composed of fourlens modules. Instead of numerically analytic analysis for the zoom locus, we suggest simple analysis forthat using lens modules optimized. After replacing four groups with equivalent thick lens modules, thepower of the fourth group, which includes a focus tunable lens, is designed to be changed to fix the imageplane at all positions. From this design process, we can realize an 8x four-group zoom system havingone moving group by employing a focus tunable lens. The final designed zoom lens has focal lengthsof 4 mm to 32 mm and apertures of F/3.5 to F/4.5 at wide and tele positions, respectively.

참고문헌 (Reference)

1 S. Lee, "Zoom lens design using liquid lens for laparoscope" 21 : 1751-1761, 2013

2 S. C. Park, "Zoom lens design using lens modules" 35 : 1668-1676, 1996

3 Sung-Chan Park, "Zoom Lens Design for a Slim Mobile Camera Using Liquid Lens" 한국물리학회 54 (54): 2274-2281, 2009

4 박성찬, "Zoom Lens Design for a 10x Slim Camera using Successive Procedures" 한국광학회 17 (17): 518-524, 2013

5 H. M. Son, "Tunable-focus liquid lens system controlled by antagonistic winding-type SMA actuator" 17 : 14339-14350, 2009

6 H. Ren, "Tunable-focus liquid lens controlled using a servo motor" 14 : 8031-8036, 2006

7 S. H. Lee, "The design and analysis of slim zoom lenssystem with high zoom ratio using lens modules" Dankook University 2008

8 K. Tanaka, "Paraxial analysis of mechanically compensated zoom lenses. 1 : Four-component type" 21 : 2174-2183, 1982

9 박성찬, "Paraxial Design Method Based on an Analytic Calculation and Its Application to a Three-group Inner-focus Zoom System" 한국물리학회 64 (64): 1671-1676, 2014

10 E. Simon, "Optical design rules of a camera module with a liquid lens and principle of command for AF and OIS functions" 7849 : 784903-, 2010

11 박성찬, "Design and Analysis of a One-moving-group Zoom System Using a Liquid Lens" 한국물리학회 62 (62): 435-442, 2013

12 M. Blum, "Compact optical design solutions using focus tunable lenses" 8167 : 81670W1-81670W9, 2011

13 R. C. Gutierrez, "Auto-focus technology" 20-25, 2007

14 P. Zhao, "An endscopic microscope with liquid-tunable aspheric lenses for continuous zoom capability" 9130 : 913004-913011, 2014