Patent ID: 6298024
Filing Date: 2001-10-02
Classification: G11B

Abstract:
An optical disc device for reproducing information recorded on an information track of an optical disc, comprising:a pickup for applying a light beam to an information-recorded side of the optical disc, receiving light reflected from the information-recorded side, and outputting a readout signal based on a quantity of the light received;amplitude indicating signal generating means for generating an amplitude indicating signal varying according to a change in an amplitude of the readout signal which occurs when the light beam is displaced relative to the information track in a radial direction of the optical disc, based on the readout signal representing the quantity of one light beam reflected from the information tracks; andidentifying means for identifing a type of the optical disc based on a density of the information tracks in a radial direction of the optical disc by comparing a difference between a maximum value and a minimum value of the amplitude indicating signal with a predetermined value.