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第二槽串
Instead of the second pit string portion, it may be possible to arrange grooves.
也可设置凹槽,代替第二槽串部分。
For example, the second pit string portion is configured so that a high RF signal level of, e.g., about 0.7, can be obtained, with the settings of the spatial frequency, the pit string depth, the duty, and the like.
It is to be understood that, in the case of manufacture of the optical disk according to the third embodiment of Fig. 12, the laser is also emitted even in the portion corresponding to the high reflection rate region HA, and the second pit string portion is formed.
As shown in Fig. 12(b), a sufficient difference in the RF signal level is ensured between the first pit string portion and the second pit string portion.
如图12(b)所示,确保第一槽串部分与第二槽串部分之间的RF信号电平存在充分差别。
In the low reflection rate region LA, the same pit strings as those of the first embodiment are formed (first pit string portion). In the high reflection rate region HA, pit strings different from the first pit string portion are formed (second pit string portion).
This gives an advantage in that it is possible to avoid a situation where the focal servo of the reproduction device becomes unstable because the RF signal level is too high. More specifically, when the RF signal level is high, a focus error signal may not be obtained appropriately depending on the reproduction device. When such situation is to be avoided, it is effective to somewhat reduce the RF signal level with the high reflection rate region HA being the second pit string portion like the present example.
Manufacturing steps of the optical disk according to the embodiment will be explained. More specifically, it is the manufacturing steps when, in the BCA, the low reflection rate region LA is formed with the pit strings, or the high reflection rate region HA is formed as the mirror portion (or second pit string portion).
As described above, even when both of the low reflection rate region LA and the high reflection rate region HA are formed with the pit strings, the appropriate BCA can be achieved if the sufficient difference in the RF signal level is ensured between the first pit string portion and the second pit string portion.
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