Saturday, August 08, 2015

SD Optics Offers Fast Focusing MEMS Lens

Korea-based SD Optics, a subsidiary of Stereo Display, Inc, unveils its Micro Mirror Array Lens System (MALS) presented in the company's Youtube video:

Update: Below are the two images showing MALS focusing on different parts of the subject, almost the same quality as received from Eekjoo Chung, just jpeg-compressed (click to enlarge):


  1. My initial association goes to adaptive optics in astronomy. Those systems are currently only for extremely expensive one-off professional telescopes. Can the MALS drive down costs so much that adaptive optics are finding its way to high end hobbyist telescopes?

  2. This is Eekjoo Chung from SD Optics.
    Currently developed MALS device can't be used for adaptive optics application field as I answered email before.
    BUT if the market volume of those application field you mentioned above is big enough to develop the NEW MALS device for it, we'd like to participate the project with you.
    Please give us more detailed information about it so that we can review it practically.

  3. How is the light reflected from the mirrors onto the sensor? Where is the sensor in the optical path of the animations and what is the resolution of the system?

    1. As you mentioned, MALS is reflective optical system. We use a beam splitter to change the direction of light ray.
      You do mean the 'sensor' as a vision camera, you can find the one near from MALS at the direction of right angle.
      The resolution of this optical system is depending on a camera resolution specification.

    2. Interesting. Are the 100um mirrors curved or are they flat? Wouldn't there be a lot of aberration if the mirrors are not curved? Also scattered light at the edge of the mirrors? Are there additional lens elements in the system for aberration correction, etc.? Do you have any images you can share?

  4. Those tiny mirrors in MALS system are flat. Our MALS system has 3-degree of freedom in motion, 2 axes rotation and 1 axis translation. As you can guess, rotation makes varying focus and translation corrects aberration in certain way. Scattered light can be occurred but it's ignorable in the imaging process point of view.
    I'm not sure but this comment window doesn't allow to attach a file.
    If you don't mind, please send an email to me so that I can reply with a file. (


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