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    • 7. 发明申请
    • INFORMATION RECORDING AND REPRODUCING DEVICE
    • 信息记录和复制设备
    • US20100118684A1
    • 2010-05-13
    • US12593439
    • 2008-03-13
    • Kunihiko HorikawaEiji MuramatsuKazutoshi KitanoAtsushi YamaguchiMasahiro MiuraKazuo Kuroda
    • Kunihiko HorikawaEiji MuramatsuKazutoshi KitanoAtsushi YamaguchiMasahiro MiuraKazuo Kuroda
    • G11B7/135
    • G11B7/0908G11B7/1353G11B7/1374G11B7/1387G11B2007/13727
    • An information recording and reproducing device diffracts by a diffracting means (14) to make laser light separated into a main beam and a sub-beam, irradiates evanescent light in relation to the main beam, by an evanescent light generating means (21), to a track where a recording pit provided on a recording surface of a recording medium is formed and also irradiates evanescent light in relation to the sub-beam to be separated to a track where no recording pit provided on the recording surface of the recording medium is formed. A moving means (210) moves the evanescent light generating means to a direction to change a gap with the recording surface. Further, a judging means (40) judges an uneven state of the recording pit formed on the recording medium, a signal generating means (3161) generates a gap error signal from a signal indicative of a return light amount in relation to the sub-beam or the main beam in accordance with the result, a control means (315) controls the moving means in accordance with a gap error signal so as to make the gap become a target value in response to the uneven state to be judged.
    • 信息记录和再现装置通过衍射装置(14)衍射,以使分离成主光束和子光束的激光相对于主光束相对于主光束照射消逝光,由ev逝光发生装置(21),以 形成记录介质的记录表面上的记录凹坑的轨道,并且还将相对于要分离的子光束的ev逝光照射到不形成记录介质的记录表面上的记录凹坑的轨道 。 移动装置(210)将瞬逝光发生装置移动到与记录表面改变间隙的方向。 此外,判断装置(40)判断在记录介质上形成的记录凹坑的不均匀状态,信号产生装置(3161)从表示相对于子光束的返回光量的信号产生间隙误差信号 或主光束,根据结果,控制装置(315)根据间隙误差信号控制移动装置,以使得间隙响应于待判断的不均匀状态而变为目标值。