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    • 10. 发明授权
    • Method for checking top and end of tape for data recording and
reproducing apparatus
    • 用于检查数据记录和再现装置的磁带的顶端和末端的方法
    • US5617336A
    • 1997-04-01
    • US330564
    • 1994-10-28
    • Sang Y. Lee
    • Sang Y. Lee
    • G11B15/08G11B15/093G11B27/17G11B27/34G11B15/00
    • G11B15/08G11B15/093G11B27/17G11B27/34G11B2220/90
    • A method for checking top and end of tape for data recording and reproducing apparatus is disclosed. The method includes a first step for sensing a transparent tape section of a start portion of a tape wound about a tape take-up reel so as to sense the tape top. At a second step, a tape supply reel rotation period is detected and the detected supply reel rotation period is compared to a preset value. When the detected supply reel rotation period is not longer than the preset value, the tape end is checked at a predetermined period. However, when the detected supply reel rotation period is longer than the preset value, no tape end is checked. The method makes top-end checking time become optimal and saves power of the recording and reproducing apparatus, and reduces pulse noise generated in turning on or turning off the top-end checking LED.
    • 公开了一种用于检查用于数据记录和再现装置的磁带的顶端和末端的方法。 该方法包括第一步骤,用于感测缠绕在卷取卷轴上的带的起始部分的透明带部分,以便感测带顶。 在第二步骤中,检测到磁带供应卷轴旋转周期,并将检测到的供应卷轴旋转周期与预设值进行比较。 当检测到的供带盘旋转周期不大于预设值时,在预定的周期检查带端。 然而,当检测到的供带盘旋转周期大于预设值时,不检查磁带端。 该方法使得顶端检查时间变得最佳,并且节省了记录和再现设备的功率,并且减少了打开或关闭顶端检查LED时产生的脉冲噪声。