公开(公告)号：WO1997039442A1

公开(公告)日：1997-10-23

申请号：PCT/JP1996002031

申请日：1996-07-19

Applicant: KABUSIKI KAISHA I.C.M ,  MURATA, Yoshitomi ,  ITO, Hisao

Inventor： KABUSIKI KAISHA I.C.M ,  MURATA, Yoshitomi

IPC: G11B05/80

CPC classification number: G11B23/282 ,  G11B5/7325 ,  G11B20/00608

Abstract: A magnetic recording medium provided with a destructible layer (2) between a substrate (1) and a magnetic recording layer (3). The destructible layer (2) is formed of a low-melting metal, such as tin, lead, or zinc, or its alloy, whose melting point is equal to or lower than that of the substrate (1). Alternatively, the destructible layer (2) can be made of a resin. The destructible layer (2) of the magnetic recording medium is destroyed by some means, including a thermal head, laser, polishing, etc. When the destructible layer (2) is destroyed, the magnetic recording layer (3) is also destroyed simultaneously. When the layer (3) is destroyed, recorded magnetic signals are not able to be rewritten and, therefore, unauthorized use of the magnetic recording medium can be prevented. Instead of the destructible layer (2), a fusing agent (5) may be mixed in the magnetic recording layer (3) to obtain the same effect.

Abstract translation: 一种在基板（1）和磁记录层（3）之间设有可破坏层（2）的磁记录介质。 可破坏层（2）由熔点等于或低于基板（1）的锡，铅或锌的低熔点金属或其合金形成。 或者，可破坏层（2）可以由树脂制成。 磁记录介质的可破坏层（2）通过某种方式被破坏，包括热敏头，激光，抛光等。当破坏层（2）被破坏时，磁记录层（3）也同时被破坏。 当层（3）被破坏时，记录的磁信号不能被重写，因此可以防止非法使用磁记录介质。 代替可破坏层（2），可以在磁记录层（3）中混合定影剂（5）以获得相同的效果。

公开(公告)号：WO1997048073A1

公开(公告)日：1997-12-18

申请号：PCT/JP1996002034

申请日：1996-07-19

Applicant: KABUSIKI KAISHA I.C.M. ,  MURATA, Yoshitomi ,  ITO, Hisao

Inventor： KABUSIKI KAISHA I.C.M. ,  MURATA, Yoshitomi

IPC: G06K19/00

CPC classification number: G11B5/00808 ,  G06K19/06187 ,  G11B19/04

Abstract: A technique for preventing alteration of a magnetic ROM card. Magnetic signals are recorded on the ROM card through a process in which a magnetic recording layer is formed by applying magnetic coating to the surface of a substrate, magnetic signals are written on the magnetic recording layer while the recording layer is undried, and the written magnetic signals are fixed by drying the recording layer immediately after the magnetic signals are written. The magnetic signals are the signals representing the number of uses. When the magnetic signals are written while the magnetic recording layer is undried, the magnetic signals cannot be erased nor rewritten. Since the magnetic signals are the signals representing the number of uses, this magnetic ROM card is especially suitable for a prepaid card. Therefore, the magnetic ROM card which cannot be altered and falsely used is especially suitable for prepaid cards. It is also possible to fix the magnetic signals recorded on both ends of the magnetic recording layer or to fix one or more intermediate magnetic signals in addition to the magnetic signals at both ends of the magnetic recording layer and not to fix the other magnetic signals.

Abstract translation: 一种用于防止更改磁性ROM卡的技术。 磁信号通过将磁性涂层施加到基板的表面上而形成磁记录层的过程被记录在ROM卡上，而在记录层未被干扰时将磁信号写入到磁记录层上，并且写磁 通过在写入磁信号之后立即干燥记录层来固定信号。 磁信号是表示使用次数的信号。 当磁记录层未被干扰时写入磁信号，磁信号不能被擦除或重写。 由于磁信号是表示使用次数的信号，所以该磁性ROM卡特别适用于预付卡。 因此，不能更改和错误使用的磁性ROM卡特别适用于预付卡。 除了磁记录层的两端的磁信号之外，还可以固定记录在磁记录层两端的磁信号或固定一个或多个中间磁信号，而不固定其它磁信号。

公开(公告)号：WO1997048096A1

公开(公告)日：1997-12-18

申请号：PCT/JP1996002859

申请日：1996-10-02

Applicant: KABUSIKI KAISHA I.C.M. ,  MURATA, Yoshitomi ,  ITO, Hisao ,  UEDA, Masanori

Inventor： KABUSIKI KAISHA I.C.M. ,  MURATA, Yoshitomi

IPC: G11B19/00

CPC classification number: G06K7/084 ,  G06K19/06187 ,  G11B19/02 ,  G11B20/00086

Abstract: A method of destroying a magnetic recording layer of a magnetic recording medium, and a magnetic reader/writer capable of destroying the magnetic recording layer. The magnetic reader/writer includes a destruct member for thermally, electrically or mechanically destroying the magnetic recording layer, and is preferably used in combination with a magnetic card having a resin-impregnated recording layer or a magnetic recording medium having a destructible layer between the base and the magnetic recording layer. When the thermal destruct member is applied to such a magnetic card, it is possible to selectively destroy only those portions of the magnetic recording layer which store unnecessary information. The reader/writer having electrical or mechanical destruct member can be used in combination with the special magnetic recording medium described above or the conventional magnetic recording medium. The magnetic recording medium destroyed by this magnetic reader/writer cannot be overwritten any longer, and unauthorized use of the magnetic card can be prevented.

Abstract translation: 一种破坏磁记录介质的磁记录层的方法，以及能够破坏磁记录层的磁读/写器。 磁读取器/写入器包括用于热，电或机械地破坏磁记录层的破坏构件，并且优选地与具有树脂浸渍记录层的磁卡或在基底之间具有可破坏层的磁记录介质组合使用 和磁记录层。 当热破坏构件被施加到这种磁卡时，可以选择性地仅破坏存储不必要的信息的磁记录层的那些部分。 具有电或机械破坏构件的读写器可以与上述专用磁记录介质或常规磁记录介质结合使用。 由该磁性读写器破坏的磁记录介质不能再被覆盖，并且可以防止非法使用磁卡。