Automatic measurement method for linearity of focus error signal of optical head

Automatic measurement method for linearity of focus error signal of optical head

  • CN 101,393,752 B
  • Filed: 11/10/2008
  • Issued: 05/30/2012
  • Est. Priority Date: 11/10/2008
  • Status: Active Grant
First Claim
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1. the method for automatic measurement of a linearity of focus error signal of optical head is characterized in that it being to carry out following steps successively with computing machine:

  • A. make optical head be in focus state;

    B. adjust focus error signal and generate parameter;

    Confirm the focus point of 2n+1 equidistance at least at focus error signal S word linear zone, n is not equal to zero positive integer, and the focus point of 2n+1 equidistance evenly distributes up and down;

    When n=1, the focus point at two ends is not the highest or minimum point;

    C. on each focus point, carry out focusing gain respectively and adjust automatically,, calculate the slope value of each focus point according to the corresponding relation of the automatic adjusted value of focusing gain and gain adjustment value and focus error signal S word linear zone slope;

    D. calculate the maximal value of focus point slope and the ratio between the minimum value, promptly obtain linearity index.

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