公开(公告)号：US5309415A

公开(公告)日：1994-05-03

申请号：US734963

申请日：1991-07-24

申请人： Koichi Takeuchi ,  Osamu Ito ,  Kyosuke Yoshimoto ,  Kunimaro Tanaka ,  Isao Watanabe ,  Kazuhiko Tsutsumi ,  Ryuichirou Arai ,  Yoshihiro Kiyose ,  Kazuhiko Nakane ,  Teruo Furukawa ,  Masayoshi Shimamoto ,  Yoshiyuki Nakai

发明人： Koichi Takeuchi ,  Osamu Ito ,  Kyosuke Yoshimoto ,  Kunimaro Tanaka ,  Isao Watanabe ,  Kazuhiko Tsutsumi ,  Ryuichirou Arai ,  Yoshihiro Kiyose ,  Kazuhiko Nakane ,  Teruo Furukawa ,  Masayoshi Shimamoto ,  Yoshiyuki Nakai

IPC分类号： G11B7/09 ,  G11B11/105 ,  G11B13/04 ,  G11B11/10 ,  G11B11/12

CPC分类号： G11B11/10517 ,  G11B11/10586 ,  G11B7/0901

摘要： Methods and apparatuses are disclosed for improving accuracy of recording and reproducing information onto and from a magneto-optic recording information medium. In the first method, a width of a mark formed by a relatively low intensity light beam between two kinds of light beam intensities used for recording information is made larger than a sum of a track land width and the maximum track offset of the light beam, thereby the mark formed by the relatively low intensity light beam covers the track land portion in its full width. In the first apparatus, a reflected light beam from the magneto-optic recording information medium is split into a reflected beam for information reproducing and a reflected beam for tracking and focusing servos at the reproducing, thereby the apparatus can remove part being affected by the track groove portion from the reflected light beam for information reproducing. In the second method and apparatus, an intensity ratio of the two kinds of intensities of light beams used for information recording is controlled in such a manner that a mark width formed by the relative low intensity light beam is wider than a mark width formed by the relative high intensity light beam.

摘要翻译： 公开了用于提高在磁光记录信息介质上记录和再现信息的精度的方法和装置。 在第一种方法中，使用用于记录信息的两种光束强度之间由相对低强度的光束形成的标记的宽度大于光束的轨迹平面宽度和最大光轨偏移之和， 由此由相对低强度的光束形成的标记以其宽度覆盖轨迹陆部。 在第一装置中，来自磁光记录信息介质的反射光束被分成用于信息再现的反射光束和用于在再现时跟踪和聚焦伺服的反射光束，从而该装置可以去除受轨迹影响的部分 沟槽部分，用于信息再现。 在第二方法和装置中，用于信息记录的光束的两种强度的强度比被控制为使得由相对低强度光束形成的标记宽度比由 相对高强度光束。