发明授权
US08050158B2 Power adjustment method, information write method and information write medium
有权
功率调整方法,信息写入方式和信息写入介质
- 专利标题: Power adjustment method, information write method and information write medium
- 专利标题(中): 功率调整方法,信息写入方式和信息写入介质
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申请号: US12569059申请日: 2009-09-29
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公开(公告)号: US08050158B2公开(公告)日: 2011-11-01
- 发明人: Soichiro Eto , Koichi Watanabe , Harukazu Miyamoto
- 申请人: Soichiro Eto , Koichi Watanabe , Harukazu Miyamoto
- 申请人地址: JP Tokyo
- 专利权人: Hitachi Consumer Electronics Co., Ltd.
- 当前专利权人: Hitachi Consumer Electronics Co., Ltd.
- 当前专利权人地址: JP Tokyo
- 代理机构: Antonelli, Terry, Stout & Kraus, LLP.
- 优先权: JP2009-158686 20090703
- 主分类号: G11B7/00
- IPC分类号: G11B7/00
摘要:
A write power adjustment method makes it possible to set optimum write power with high precision. Trial writing is conducted by using write power Pw,m (where m is an integer) of a plurality of kinds, and a modulation M,m associated with each write power is calculated. Optimum asymptotic power Pasy-opt is calculated by performing predetermined computation by using reference asymptotic power Pasy-ref and reference write start power Pws-ref which are previously determined for each medium. An evaluated value S,m=M,m×(Pw,m−Pasy-opt) is calculated by using the optimum asymptotic power Pasy-opt. Write power Pw that makes the evaluated value S equal to zero when applying straight line approximation to a relation between the write power Pw,m and the evaluated value S,m is calculated as optimum write start power Pws-opt. And optimum write power Pw-opt is found by performing predetermined computation on the optimum write start power Pws-opt.
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