Thin autofocus camera module by a large-stroke micromachined deformable mirror
Optics Express, Vol. 18, Issue 11, pp. 11097-11104 (2010)
http://dx.doi.org/10.1364/OE.18.011097
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Abstract
The conventional auto-focus and zoom image systems were made by a set of motor-moved lenses. Because of mechanical moving parts, it is not easy to miniaturize their sizes. In this paper, we propose a thin autofocus system using a large stroke MEMS (micro-electro-mechanical systems) deformable mirror which has the potential to downscale the size and to minimize chromatic aberration. The large stroke MEMS deformable mirror is made by a polyimide membrane that has a maximum 12 μm displacement over a 3 mm aperture. The module size is 5.4 mm thick in optical design layout and 6.7 mm after packaging. This autofocus system is designed with the f-number = 4.13, on-axis MTF = 0.28 at full frequency of 230 cycles/mm, and incident light within ± 26 degree. The position of clear image can vary from 4 cm to 50 cm achieved by controlling the surface curvature of the MEMS deformable mirror.
© 2010 OSA
OCIS Codes
(220.0220) Optical design and fabrication : Optical design and fabrication
(220.4610) Optical design and fabrication : Optical fabrication
ToC Category:
Optical Design and Fabrication
History
Original Manuscript: April 5, 2010
Revised Manuscript: May 4, 2010
Manuscript Accepted: May 4, 2010
Published: May 11, 2010
Virtual Issues
Vol. 5, Iss. 10 Virtual Journal for Biomedical Optics
Citation
Hsin-Ta Hsieh, Hsiang-Chun Wei, Meng-Hsuan Lin, Wei-Yao Hsu, Yuan-Chieh Cheng, and Guo-Dung John Su, "Thin autofocus camera module by a large-stroke micromachined deformable mirror," Opt. Express 18, 11097-11104 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-11-11097
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References
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