G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.21
G11B 7/09 (2006.01)
Patent
CA 1328134
METHOD FOR DETECTING TRACKING ERROR IN OPTICAL DISK SYSTEM AND ITS OPTICAL SYSTEM DEVICES THEREFOR ABSTRACT OF THE DISCLOSURE A method for detecting a tracking error in a process of tracking a groove track on a recording medium includes the/steps of: irradiating a first light spot onto a groove track on a recording medium as a focused light beam for carrying out recording, reproducing, or erasing of information on the groove track of the recording medium, and irradiating a second and a third light spots onto an area around the groove track on the recording medium as focused light beams simultaneously with the irradiation of the first light spot, the second and third light spots are irradiated onto an area around the groove track on one side of the first light spot in a manner such that each of the second and third light spots covers both an inside and outside of the groove track.
592376
Ikeda Hiroyuki
Kato Masayuki
Kurokawa Kaneyuki
Maeda Satoshi
Yamagishi Fumio
Fujitsu Limited
Mcfadden Fincham
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