Thin zoom camera module by a large-stroke micromachined Polydimethylsiloxane deformable mirror
Date Issued
2012
Date
2012
Author(s)
Huang, Yu-Hung
Abstract
Conventional zoom autofocus system effect is caused by changing position of lens via a motor, this method usually requires a larger space and causes greater power loss. In this thesis, we designed a reflective 2X zoom system. Reflective optics is a technology not only can make the space application become more efficient and flexible, but also has the advantage that it induces low chromatic aberrations. For nowadays, optical systems are asked to light weight and small size, it is an important topic to use reflective optics effective to achieve the goal.
We use organic Micro Electro Mechanical Systems (MEMS) deformable mirror (DM) as a reflective element of zoom system, we fabricated a highly flexible Polydimethylsiloxane (PDMS) membrane which has low Young’s modulus (<10 GPa) and low residual stress. The incident beam is reflected or focused by the aluminum coating layer on the membrane. The optical power (diopter,m^(-1)) of DM is controlled by the electrostatic force results from the applied voltage between membrane (Aluminum coating) and bottom electrode pad. We successfully made available deformable mirror used as a concave mirror and a convex mirror. Advantages of the polymer DM have large stroke and low applied voltage.
Finally we will build up a zoom optical system by three parts, lens is fabricated by Instrument Technology Research Center (ITRC), and package of module is designed by mechanical engineer, and the deformable mirror is produced by our lab. The zoom ratio is approximately 1.3 times.
Subjects
Reflective Optics
MEMS Deformable Mirror
Zoom System
Optical system design
camera lens
Type
thesis
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