G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/095 (2006.01) G11B 7/085 (2006.01) G11B 7/09 (2006.01)
Patent
CA 1294042
25307-182 ABSTRACT Push-pull type tracking error signal produced by the reflected light from pits in ID area of an optical disc is aver- aged and sampled over a period while the spot scans the ID pits, and is held for each sector, thus named as a first sampled track- ing error signal. The tracking error signal is also sampled while the light is scanning over a vacant zone having no pit in a data area, thus named as a second sampled tracking error signal. This vacant zone to be sampled is located either before or after a sequence of data bits in each sector. The first sampled tracking error signal is smaller than the second sampled tracking error signal, because of the AC component therein produced by the pits. Thus, when an offset of the tracking exists, though the tracking error signal is almost zero by the servo control the first sampled tracking error signal is not zero. Therefore, difference of two tracking error signals indicates amount of the offset. This offset signal may be visually monitored for adjusting the offset of the apparatus, or may be fed back for the tracking servo. The invention can be applied to a disc format having no mirror mark. The circuit of the invention can be simple and inexpensive, because no high frequency need be output therefrom.
553320
Fetherstonhaugh & Co.
Fujitsu Limited
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