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Optical head apparatus including a waveguide layer with concentric or spiral periodic structure

  • US 5,200,939 A
  • Filed: 04/04/1991
  • Issued: 04/06/1993
  • Est. Priority Date: 08/05/1988
  • Status: Expired due to Fees
First Claim
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1. An optical head apparatus including a converging means, said converging means comprising:

  • a first waveguide layer having a central region;

    a first concentric or spiral periodical structure formed on said first waveguide layer around said central region;

    a laser beam source for generating a laser beam;

    coupling means, having a center axis, for guiding said laser beam emitted from said laser beam source to a cross point between said center axis and said first wave-guide layer within said central region of said first waveguide layer,said first waveguide layer converting said laser beam into waveguide light and leading said waveguide light from said central region to said periodical structure which causes said waveguide light to be radiated outside of said first waveguide layer so as to be converged to at least one converging point outside of said first waveguide layer.

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