| 摘要 |
PURPOSE: To provide a stamper of a groove system by providing a pit line or a hill line on either one side of a land or a groove and analytically deriving a cross talk free conditional relation. CONSTITUTION: The cross talk Th due to the hill 4 on the land 7 is defined as follows. CTh =CGh -CLh -6(dB). In such a case, a carrier level of a frequency 1.41MHz equivalent to a hill pitch 5μm is made the CLh (dB), and a signal strength leaking in from the hill line on the adjacent land while tracking the groove, that is, the carrier level of the frequency 1.41MHz is made CGh (dB). Then, when the carrier level of the frequency 1.18MHz equivalent to the pit pitch 6μm is made CGp (dBm), and the carrier level of the frequency 1. 18MHz is made CLp (dBm), the cross talk CT, due to the pit line on the groove is defined by CTp =CGp -6(dB). When they are measured, the CTh becomes -35.8dB, and the CTp becomes -40.0dB, and the excellent result is obtained.
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