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1. 发明专利

JP2008310932A Demagnetizing device and demagnetizing method of magnetic recording medium 有权
标题翻译：磁记录介质的去磁装置和去磁方法
公开(公告)号：JP2008310932A
公开(公告)日：2008-12-25
申请号：JP2007160669
申请日：2007-06-18
申请人： Hitachi Maxell Ltd , 日立マクセル株式会社
发明人： SAIKAI JUNICHIRO , MASUTOMI KAZUHIKO , UENISHI TAKESHI , KUZE SADAMU
IPC分类号： G11B5/845
摘要： PROBLEM TO BE SOLVED: To provide a demagnetizing device and a demagnetizing method of a magnetic recording medium which are satisfactory in demagnetization efficiency and simple in configuration.
SOLUTION: In the demagnetizing device provided with a pair of permanent magnet rows 3a and 3b each formed by arranging a plurality of permanent magnets in a row and a guide 2 on which the magnetic recording medium 1 abuts and runs, the pair of permanent magnet rows 3a and 3b are disposed opposite to each other; magnetic poles of the permanent magnets forming the pair of permanent magnet rows 3a and 3b are disposed so that alternate magnetic fields where the directions of the magnetic fields are repetitively reversed in the row directions of the permanent magnet rows 3a and 3b are formed, and the pair of permanent magnet rows 3a and 3b are disposed so that the interval between the pair of permanent magnet rows 3a and 3b are made wider as the permanent magnet rows advances from an upstream side to a downstream side of a conveyance direction of the magnetic recording medium 1.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供一种解除磁化效率和结构简单的磁记录介质的去磁装置和去磁方法。解决方案：在具有一对永磁体列3a和3b的去磁装置中，每一个永久磁铁排3a和3b分别通过排列多个永磁体和磁记录介质1邻接并运行的引导件2而形成，永磁体列3a和3b彼此相对布置; 形成一对永磁体列3a和3b的永磁体的磁极被设置成使得在永磁体列3a和3b的行方向上磁场方向反复反复的交替磁场，并且一对永磁体列3a和3b被设置成使得当永磁体列从磁记录介质的输送方向的上游侧向下游侧延伸时，一对永磁体列3a和3b之间的间隔变宽 1.版权所有（C）2009，JPO＆INPIT

2. 发明专利

JP2012079389A Demagnetizing device 审中-公开
标题翻译： DEMAGNEZZING DEVICE
公开(公告)号：JP2012079389A
公开(公告)日：2012-04-19
申请号：JP2010226520
申请日：2010-10-06
申请人： Hitachi Maxell Ltd , 日立マクセル株式会社
发明人： SAIKAI JUNICHIRO , KUZE SADAMU , MASUTOMI KAZUHIKO , SASAKI TETSUO
IPC分类号： G11B5/024
摘要： PROBLEM TO BE SOLVED: To provide a demagnetizing device capable of well demagnetizing even a magnetic recording medium having a high coercive force.SOLUTION: In a demagnetizing device, multiple permanent magnets are disposed in a circumferential direction on each of rotary plates which face each other and rotate in synchronization with each other, and the rotary plates are made to rotate to generate alternate magnetic fields and, thus, a magnetic recording medium is demagnetized. Also, the permanent magnets disposed on each of the rotary plates with facing each other are disposed in a manner of alternate same poles and different poles facing each other, and the direction of magnetic lines of force in each portion of same pole facing parts and different pole facing parts is alternately in reverse.
摘要翻译：要解决的问题：提供即使是具有高矫顽力的磁记录介质也能够良好地退磁的退磁装置。解决方案：在退磁装置中，多个永久磁铁沿圆周方向设置在彼此面对的每个旋转板上并且彼此同步地旋转，并使旋转板旋转以产生交替的磁场，并且因此，磁记录介质被消磁。此外，设置在彼此面对的每个旋转板上的永磁体以彼此相对的交替相同的极和不同极的方式设置，并且在同一极对面部分的每个部分中的磁力线的方向极面对的部件交替反向。版权所有（C）2012，JPO＆INPIT

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