Patent ID: 6246647
Filing Date: 2001-06-12
Classification: G11B

Abstract:
An optical disc apparatus for recording and/or reproducing information signals using an optical disc, said apparatus comprising:an optical pickup including an objective lens, which is arranged facing an optical disc, for converging and illuminating laser light on a signal recording surface of said optical disc, said optical pickup further including an objective lens driver for driving said objective lens at least in a direction perpendicular to said signal recording surface;a focusing circuit for generating a focusing error signal using laser light reflected by said optical disc, said focusing error signal corresponding to displacement of a converging point of said laser light from the signal recording surface of said optical disc in said perpendicular direction;a servo control circuit for controlling said objective lens driver based on said focusing error signal so that said converging point is relocated so as to be on said signal recording surface of the optical disc;a position detector for detecting a distance between said objective lens and said optical disc wherein a position signal output by said position detector is provided to said servo control circuit to prevent a collision of said objective lens with said optical disc; andan impact detector for electronically detecting an impact to said optical disc apparatus from outside.