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Optical disc apparatus

  • US 20040136280A1
  • Filed: 10/20/2003
  • Published: 07/15/2004
  • Est. Priority Date: 04/20/2001
  • Status: Active Grant
First Claim
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1. An optical disk apparatus, comprising:

  • a converging means for converging and irradiating a light beam from a light source toward a rotating information carrier;

    a focus displacement signal detection means for generating a signal in accordance with a positional displacement of a focus of the light beam with respect to an information surface of the information carrier;

    a focus shifting means for shifting the converging means in a direction normal to the information surface of the information carrier;

    a focus control means for driving the focus shifting means in accordance with the signal from the focus displacement signal detection means, and performing a control such that the focus of the light beam follows the information surface of the information carrier;

    an information surface detection means for detecting whether the focus of the light beam is near the information surface of the information carrier, if the focus control means is in an inoperative state; and

    a collision evasion means for generating a driving signal for the focus shifting means such that the converging means is displaced in a direction away from the information carrier if a signal is generated by the information surface detection means.

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