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Related Concept Videos

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Related Experiment Video

Updated: Jun 11, 2026

Bringing the Visible Universe into Focus with Robo-AO
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Published on: February 12, 2013

Thin autofocus camera module by a large-stroke micromachined deformable mirror.

Hsin-Ta Hsieh1, Hsiang-Chun Wei, Meng-Hsuan Lin

  • 1Graduate Institute of Photonics and Optoelectronics, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617 Taiwan.

Optics Express
|July 1, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a thin autofocus system utilizing a micro-electro-mechanical system (MEMS) deformable mirror. This innovation enables miniaturization and improved optical performance for imaging systems.

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Area of Science:

  • Optics and Photonics
  • Micro-electro-mechanical Systems (MEMS)

Background:

  • Conventional autofocus and zoom systems rely on motor-driven lenses, limiting miniaturization due to mechanical components.
  • Mechanical complexity in traditional systems hinders size reduction and can introduce optical aberrations.

Purpose of the Study:

  • To propose a novel, thin autofocus system leveraging a large stroke MEMS deformable mirror.
  • To demonstrate the potential for miniaturization and chromatic aberration reduction in imaging systems.

Main Methods:

  • Fabrication of a large stroke MEMS deformable mirror using a polyimide membrane with a 12 micrometer displacement over a 3 mm aperture.
  • Integration of the MEMS mirror into an optical system with an f-number of 4.13 and a field of view of +/-26 degrees.
  • Control of the MEMS mirror's surface curvature to adjust focus from 4 cm to 50 cm.

Main Results:

  • Achieved a compact module size of 5.4 mm (optical layout) and 6.7 mm (packaged).
  • Demonstrated an on-axis Modulation Transfer Function (MTF) of 0.28 at 230 cycles/mm.
  • Successfully varied the clear image position from 4 cm to 50 cm by controlling mirror curvature.

Conclusions:

  • The proposed MEMS deformable mirror autofocus system offers a viable path towards miniaturized, high-performance imaging solutions.
  • This technology minimizes chromatic aberration and provides a wide focusing range in a compact form factor.