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    • 5. 发明授权
    • Write current setting method, and recording and reproducing device
    • 写当前设置方法,以及记录和再现设备
    • US6075664A
    • 2000-06-13
    • US18198
    • 1998-02-03
    • Shoichi Shimizu
    • Shoichi Shimizu
    • G11B5/09G11B5/00G11B5/012G11B20/10G11B27/36
    • G11B27/36G11B20/10009G11B5/012G11B2005/001
    • A write current is set to be an optimum write current. The write current is supplied to a recording head when information is recorded on a recording medium. First margin characteristics are measured which are used for obtaining a lower limit value of the write current to be supplied to the recording head. Second margin characteristics are measured which are used for obtaining an upper limit value of the write current to be supplied to the recording head. As the lower limit value of the write current, a write current value is set for which a margin has a predetermined value in the first margin characteristics. As the upper limit value of the write current, a write current value is set for which a margin has a predetermined value in the second margin characteristics. As the optimum write current, a write current is set which has a middle value between the lower limit value of the write current and the upper limit value of the write current.
    • 写入电流被设置为最佳写入电流。 当信息被记录在记录介质上时,写入电流被提供给记录头。 测量用于获得要提供给记录头的写入电流的下限值的第一余量特性。 测量用于获得要提供给记录头的写入电流的上限值的第二余量特性。 作为写入电流的下限值,设定在第一余量特性中余量具有预定值的写入电流值。 作为写入电流的上限值,设定在第二余量特性中余量具有预定值的写入电流值。 作为最佳写入电流,写入电流被设定为写入电流的下限值和写入电流的上限值之间的中间值。
    • 8. 发明授权
    • Cascade-comparator A/D converter
    • 级联比较器A / D转换器
    • US4542370A
    • 1985-09-17
    • US419475
    • 1982-09-17
    • Hisashi YamadaShoichi Shimizu
    • Hisashi YamadaShoichi Shimizu
    • H03M1/00H03K13/175
    • H03M1/16H03M1/361
    • In an A/D converter in which a first comparator A/D converter for providing the most significant bits of a digital output and a second comparator A/D converter for providing the least significant bits of the digital output are cascaded, a switching circuit is provided between the first A/D converter and the second A/D converter. This switching circuit is responsive to the comparison between an analog input voltage and first comparison reference voltages in the first A/D converter to apply two adjacent first reference voltages between which the analog input voltages lies to both ends of a voltage dividing circuit network of the second A/D converter to thereby provide second comparison reference voltages. In the second A/D converter, the second comparison reference voltages are compared with the analog input voltage by comparators, to provide the least significant bits of a digital output.
    • 在A / D转换器中,级联用于提供数字输出的最高有效位的第一比较器A / D转换器和用于提供数字输出的最低有效位的第二比较器A / D转换器, 设置在第一A / D转换器和第二A / D转换器之间。 该开关电路响应于第一A / D转换器中的模拟输入电压和第一比较参考电压之间的比较,以施加两个相邻的第一参考电压,模拟输入电压之间位于模拟输入电压的分压电路网络的两端 第二A / D转换器,从而提供第二比较参考电压。 在第二A / D转换器中,通过比较器将第二比较参考电压与模拟输入电压进行比较,以提供数字输出的最低有效位。
    • 10. 发明申请
    • Method of protection of information of depopulated magnetic disk apparatus
    • 放电磁盘装置信息的保护方法
    • US20070025005A1
    • 2007-02-01
    • US11284992
    • 2005-11-22
    • Shoichi Shimizu
    • Shoichi Shimizu
    • G11B27/36
    • G11B27/36G11B2220/2516
    • A method of protection of information of a depopulated magnetic disk apparatus having at least one pair of a magnetic head and a magnetic disk including a pair of a magnetic head and a magnetic disk found by tests of the magnetic disk apparatus before shipment to have characteristics of predetermined threshold values or less set to be skipped in reading and writing operations and sold as a magnetic disk apparatus with a one model smaller capacity, comprising detecting a state of deterioration of magnetic heads and magnetic disk surfaces being used, rewriting information recorded at magnetic disk surfaces of pairs judged to have deteriorated on surfaces of skipped magnetic disks corresponding to usable magnetic heads, and prohibiting use of magnetic heads in use, thereby inexpensively and reliably preventing loss of information in the magnetic disk apparatus.
    • 一种用于保护具有至少一对磁头和包括一对磁头和磁盘的放电磁盘装置的信息的方法,所述磁头和磁盘通过在装运前的磁盘装置的测试而发现,具有 设定为在读写操作中被跳过的规定阈值以下,作为具有较小容量的一个型号的磁盘装置出售,包括检测使用的磁头和磁盘表面的劣化状态,重写磁盘上记录的信息 在对应于可使用的磁头的跳过的磁盘的表面上被判断为劣化的表面,并且禁止在使用中使用磁头,从而廉价且可靠地防止磁盘装置中的信息丢失。