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TUNABLE LIQUID LENS WITH REDUCED ABERRATION

  • US 20090213321A1
  • Filed: 02/25/2009
  • Published: 08/27/2009
  • Est. Priority Date: 02/25/2008
  • Status: Active Grant
First Claim
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1. An imaging device comprising:

  • an image sensor;

    a fixed lens assembly having a mounting for said image sensor at which a far field is in focus on said image sensor;

    a tunable liquid crystal lens mounted in an optical path of said image sensor and said fixed lens assembly, said tunable liquid crystal lens having an optical power that increases from zero field level to a maximum power at a second field level, and decreases from said second field level to a non-zero end optical power at a desired maximum field level; and

    an optical power adjustment element comprising at least one of a spacer and an additional lens, wherein said optical power adjustment element cancels said non-zero optical power so that said image sensor receives a far field image at said desired maximum field level.

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