发明授权
- 专利标题： Optical information recording medium reproducing apparatus, method for reproducing optical information recording medium, program for reproducing optical information recording medium, and computer readable recording medium
- 专利标题（中）： 光信息记录介质再现装置，光信息记录介质的再现方法，再现光信息记录介质的程序和计算机可读记录介质
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申请号： US12588181申请日： 2009-10-07
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公开(公告)号： US08514674B2公开(公告)日： 2013-08-20
- 发明人: Masaki Yamamoto , Hirohisa Yamada , Yasuhiro Harada , Hideharu Tajima , Jun Akiyama
- 申请人： Masaki Yamamoto , Hirohisa Yamada , Yasuhiro Harada , Hideharu Tajima , Jun Akiyama
- 申请人地址： JP Osaka
- 专利权人： Sharp Kabushiki Kaisha
- 当前专利权人： Sharp Kabushiki Kaisha
- 当前专利权人地址： JP Osaka
- 代理机构： Edwards Wildman Palmer LLP
- 代理商 George W. Neuner
- 优先权： JP2008-262745 20081009
- 主分类号： G11B11/00
- IPC分类号： G11B11/00 ; G11B7/00
摘要：
An optical information recording medium reproducing apparatus 1 includes: a signal detecting/extracting section 15 extracting, from reproduction signal data, extracted reproduction signal data corresponding to a predetermined data pattern; a calculating circuit 10 calculating, from the extracted reproduction signal data, a reproducing power control value for controlling laser light reproducing power; and a reproducing power control section 16 controlling the reproducing power based on the reproducing power control value. The predetermined data pattern is obtained from a space which is sandwiched between marks of λ/2NA or longer and is shorter than λ/4NA and/or a mark which is sandwiched between spaces of λ/2NA or longer and is shorter than λ/4NA. Therefore, even when environmental temperature changes in reproduction, the optical information recording medium reproducing apparatus capable of reproducing a super resolution medium including marks each shorter than λ/4NA optimally controls laser light reproducing power and prevents degradation of reproduction signal quality.
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