Patent ID: 6256273
Filing Date: 2001-07-03
Classification: G11B

Abstract:
A focusing control apparatus comprising:reading means for irradiating read light to a recording medium having information recording surfaces formed on at least two layers, respectively, receiving return light of the read light from said recording medium, and generating a read signal; andcontrol means for executing a focus jumping process to generate a drive signal of a focusing actuator to more an optimum light converging position of said read light from one of said recording surfaces to the other on the basis of a detection signal which is generated on the basis of detecting zero crossing points of a focus error signal of said return light,wherein said apparatus further comprises drop-out detecting means for detecting a drop-out of said read signal, andsaid control means executes the focus jumping process only when said drop-out is not detected, said control means including an inhibiting means for inhibiting the focus jumping process.