• US 20080212452A1
  • Filed: 02/29/2008
  • Published: 09/04/2008
  • Est. Priority Date: 03/02/2007
  • Status: Active Grant
First Claim
Patent Images

1. An optical pickup apparatus comprising:

  • an objective lens configured to focus laser light having the Gaussian distribution properties emitted from a laser diode to a signal recording layer of an optical disc; and

    an adjustment coating formed on a surface of an incident face of the objective lens on which the laser light is to be made incident, the adjustment coating being configured to adjust transmittance of the laser light passing through the objective lens,the adjustment coating being formed on the surface of the incident face such that the transmittance is lowered as a numerical aperture of the objective lens is reduced.

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