发明名称 |
An external magnetic field device for a magnetooptical information recording and reproducing apparatus. |
摘要 |
<p>An external magnetic field device for a magnetooptical information recording and reproducing apparatus in which an external magnetic field to be applied to a magnetooptical information recording medium is modulated by supplying to a magnetic head (3) an alternate current the polarity of which is changed according to information to be recorded. The device comprises an offset circuit (2) for producing an offset in the alternate current. The direction of the offset is selected so as to increase the current level of the polarity by which the initial magnetization of the information recording medium (4) is reversed. The direction of the offset may be selected so as to cancel the leakage magnetic field.</p> |
申请公布号 |
EP0352099(A2) |
申请公布日期 |
1990.01.24 |
申请号 |
EP19890307336 |
申请日期 |
1989.07.19 |
申请人 |
SHARP KABUSHIKI KAISHA |
发明人 |
MIYAKE, TOMOYUKI;KATAYAMA, HIROYUKI;NAKAYAMA, JUNICHIRO;MIYAKE, TAKAHIRO;OHTA, KENJI;KOBAYASHI, SHOZO |
分类号 |
G11B11/10;G11B5/02;G11B11/105 |
主分类号 |
G11B11/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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