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Optimal elements (such as vari focal lens component, vari-focal diffractive optical element and variable declination prism) and electronic image pickup unit using optical elements

  • US 7,009,757 B2
  • Filed: 06/27/2003
  • Issued: 03/07/2006
  • Est. Priority Date: 06/10/1997
  • Status: Expired due to Fees
First Claim
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1. An optical element having a variable optical characteristic comprising:

  • an optical element using a substance which has a variable refractive index and is dispersed in polymers; and

    a driving device which varies the refractive index of said substance and further comprising in order from a side of light incidence;

    a first optical member which has a first surfaces and a second surface;

    a second optical member which has a third surface and a fourth surface;

    a pair of transparent electrodes;

    a polymer dispersive liquid crystal layer interposed between said transparent electrodes; and

    means for applying an electric field to said polymer dispersive liquid crystal layer by way of said transparent electrodes,wherein an optical characteristic is varied by changing a refractive index of said liquid crystal layer by applying an electric field to said polymer dispersive liquid crystal layer by said means.

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