Control apparatus for controlling focusing, accessing and spindle rotating circuits to operate simultaneously

A focus control apparatus comprising:

• rotation means for rotating a recording medium;
• converging means for converging and radiating a light beam on the recording medium which is rotated by the rotation means;
• first moving means for moving a converged point of the light beam which is converged by the converging means in a direction substantially perpendicular to a face of the recording medium;
• second moving means for moving the converged point of the light beam which is converged by the converging means in a direction across tracks on the face of the recording medium between an innermost track and an outermost track;
• converged state detection means for generating a signal depending on a converged state of the light beam on the recording medium;
• and
• focus control means for driving the first moving means An accordance with the signal output from the converged state detection means and for controlling the converged state so that a converged position of the light beam on the recording medium is substantially fixed,
• wherein the focus control means includes:
• amplitude detection means for detecting an amplitude of the signal output from the converged state detection means;
• and
• timing control means for generating timings and for controlling the rotation means, the first moving means, and the second moving means to start to operate substantially simultaneously based on the timings.