发明名称 |
Optical disk unit, control method thereof, optical information recording medium and recording-regenerating method using this optical information recording medium |
摘要 |
In a control method of an optical disk unit, it is judged by performing a tentative tracking operation of an optical pickup in a constant region of an optical disk whether a tracking position of the optical pickup is located in a land or groove portion. After a correct tracking control condition is judged, an access operation according to command information is executed. The optical disk unit has a two-divisional light receiving element for receiving diffracted light caused by a pregroove and a prepit of the optical disk, and a differentiator for generating a difference signal between signals of this light receiving element. The optical disk unit further has an adder for generating a sum signal of the signals of the light receiving element, and a tracking signal selector for selecting the difference or sum signal when the tracking operation is performed in a pregroove or prepit region, respectively. An optical information recording medium and a method for recording and regenerating information by using this optical information recording medium are also shown.
|
申请公布号 |
US5822286(A) |
申请公布日期 |
1998.10.13 |
申请号 |
US19970940102 |
申请日期 |
1997.09.29 |
申请人 |
RICOH COMPANY, LTD. |
发明人 |
NAKAYAMA, MASAHIKO;KOIDE, HIROSHI;SHIMIZU, AKIHIKO |
分类号 |
G11B7/007;G11B7/013;G11B7/085;G11B7/09;G11B7/26;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/007 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|