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公开(公告)号:US4937436A
公开(公告)日:1990-06-26
申请号:US309003
申请日:1989-02-07
申请人: David Eglise , Douglas A. Jenkins
发明人: David Eglise , Douglas A. Jenkins
摘要: A magnetically encoded card (2) has a recording track (6, 8) containing data (10, 14, 16, 18) which can be read and re-written by a card reader (30), and a further recording (12) at a much higher spatial bit denisty than the data (10, 14, 16, 18). The high denisty recording (12) is formed using a special write head capable of operating at greater bit densities than the head of the card reader used to write information to the card. The card (2) is deemed valid only if the presence of the high density recording (12) is detected by a read head (34) of the card reader.
摘要翻译: 磁编码卡(2)具有包含数据(10,14,16,18)的记录轨道(6,8),可由读卡器(30)读取和重新写入数据,以及另外的记录(12) 在比数据(10,14,16,18)高得多的空间位。 高拒绝记录(12)使用能够以比用于向卡写入信息的读卡器的头部更大的位密度进行操作的特殊写头形成。 只有当读卡器的读头(34)检测到高密度记录(12)的存在时,卡(2)被认为是有效的。