| 摘要 |
PROBLEM TO BE SOLVED: To provide a focal control adjusting method in which a disturbance component can be suppressed. SOLUTION: The method comprises a first step for detecting a focal error signal obtained by condensing and projecting a light beam on a rotating recording medium 1, and a second step for setting focal control gain for controlling position shift between a recording surface of the recording medium 1 and the light beam based on the focal error signal detected in the first step. In the first step, a result obtained by multiplying the position detection signal (sub light beams) by a preset coefficient is added to the position detection signal (main light beam), and a result of the addition is detected as the focal error signal. The coefficient is set in accordance with the focal error signal in the first step. COPYRIGHT: (C)2007,JPO&INPIT
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