发明名称 |
OPTICAL DISK AND METHOD FOR REPRODUCING REFERENCE SIGNAL THEREFROM |
摘要 |
In an optical disk having grooves, pits representing reference signals in header regions of the grooves are disposed to be spaced apart from each other in a longitudinal direction of the groove to suppress undesirable interference or crosstalk of the reference signals in adjacent V-grooves. In the reproduction of such reference signals, two laser beam spots are respectively irradiated on the first and second oblique surface tracks in the V-groove. Two electric signals made by detecting the light reflected from the spots are examined to determine whether they are in coincidence. When coincidence is confirmed, the signals are used as valid reference signals. |
申请公布号 |
EP0176755(A3) |
申请公布日期 |
1987.03.25 |
申请号 |
EP19850110716 |
申请日期 |
1985.08.26 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
TAKEMURA, YOSHINARI;OBARA, KAZUAKI;NAGASHIMA, MICHIYOSHI |
分类号 |
G11B7/005;G11B7/007;G11B7/013;G11B7/24;G11B19/24;G11B27/19;G11B27/24;G11B27/30;(IPC1-7):G11B7/007 |
主分类号 |
G11B7/005 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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