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Optical head and information recording/reproducing apparatus

  • US 20060245317A1
  • Filed: 04/25/2006
  • Published: 11/02/2006
  • Est. Priority Date: 04/27/2005
  • Status: Abandoned Application
First Claim
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1. An optical head unit comprising:

  • an object lens which captures light reflected on the recording/reproducing surface of a recording medium;

    an optical diffraction element which includes a first diffraction grating to diffract the light captured by the object lens in a direction predetermined according to the wavelength of the light, and a second diffraction grating which has a diffraction pattern different from the first diffraction grating and diffracts the light in a direction predetermined according to the wavelength of the light; and

    a photodetector which detects the light diffracted by the optical diffraction element at a position predetermined according to the diffraction angle, and generates an output signal with a largeness corresponding to the intensity of the light.

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