发明名称 |
Method and apparatus for inspecting optical disc |
摘要 |
Reflected light caused by reflection of a laser beam at a first layer of an optical disc is converted into a main signal. Reflected light caused by reflection of the laser beam at a second layer of the optical disc is converted into a sub signal. An address of a currently-accessed position in the first layer is detected from the main signal. A reference address in the first layer corresponds to a boundary between a signal recorded area and a signal unrecorded area in the second layer. A specified address in the first layer corresponds to a position radially separated from the position at the reference address by an allowable range. A misalignment between tracks on the first and second layers is concluded to be within the allowable range in cases where the sub signal substantially takes a reference level when the detected address reaches the specified address.
|
申请公布号 |
US7636285(B2) |
申请公布日期 |
2009.12.22 |
申请号 |
US20060594183 |
申请日期 |
2006.11.08 |
申请人 |
VICTOR COMPANY OF JAPAN, LTD. |
发明人 |
TOKIWA KAZUNORI |
分类号 |
G11B7/00 |
主分类号 |
G11B7/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|