发明申请
- 专利标题: Information recording medium, reproduction method, reproduction apparatus and manufacturing apparatus thereof
- 专利标题(中): 信息记录介质,再现方法,再现装置及其制造装置
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申请号: US11150341申请日: 2005-06-13
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公开(公告)号: US20050276213A1公开(公告)日: 2005-12-15
- 发明人: Akihito Ogawa , Chosaku Noda , Yutaka Kashihara , Yuji Nagai
- 申请人: Akihito Ogawa , Chosaku Noda , Yutaka Kashihara , Yuji Nagai
- 优先权: JP2004-175684 20040614; JP2004-361819 20041214
- 主分类号: G11B7/005
- IPC分类号: G11B7/005 ; G11B7/007 ; G11B7/26 ; G11B27/19 ; G11B27/24 ; G11B7/24
摘要:
The numbers of times by which plural types of segments are consecutively arranged are limited, an address reading performance is enhanced and address information is correctly read out based on determination of the number of consecutive segments. A track is divided into physical segments, N (=17) wobble data units of constant length are formed in each physical segment, the wobble data unit (WDU) is defined to include a first unit (P) having a wobble modulation portion in a first half portion, a second unit (S) having a wobble modulation portion in a latter half portion and a third unit (U) having no wobble modulation portion, and the physical segment is defined to have segment types (TYPE 1, 2, 3) which each include the third unit (U) in a certain area thereof without fail and respectively include the first, second and a combination of the first and second units in the remaining areas. In the arrangement on the track, a lower-limit number of times M1 by which the first and second types (TYPE1, TYPE2) are consecutively arranged and an upper-limit number of times M2 by which the second types (TYPE2) are consecutively arranged are limited and the first type (TYPE1) and the second type (TYPE2) are respectively arranged immediately before and after the third type (TYPE3).