Patent ID: 6385143
Filing Date: 2002-05-07
Classification: G11B

Abstract:
An optical disc read method of reading data recorded on tracks of an optical disc formed with a spiral track with n light beam systems for applying different light beams 1, . . . , i, . . . , n at the same time to n tracks at every (c+1)-th and independently detecting the light beams reflected from the optical disc, where c is an integer of 1 or larger and n is an integer of 2 or larger, characterized in that;if there is a light beam system or systems incapable of reading the record data of the optical disc, the record data of the optical disc is read by alternately performing a continuous reading operation for approximately (c+1) rotations and a track jump operation for approximately {(c+1)Â·Mâˆ’1)âˆ’1} tracks in a forward direction after said continuous reading operation, by only using detection outputs from a group of M (M