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    • 71. 发明授权
    • Optical disk apparatus having auto-focusing servo systems for multiple
light spots and method of starting the auto-focusing servo systems
    • 具有用于多个光点的自动聚焦伺服系统的光盘装置和启动自动聚焦伺服系统的方法
    • US5034941A
    • 1991-07-23
    • US316786
    • 1989-02-28
    • Masuo KasaiTakeshi MaedaKiyoshi Matsumoto
    • Masuo KasaiTakeshi MaedaKiyoshi Matsumoto
    • G11B7/085G11B7/09
    • G11B7/0945
    • A recording/reproduction head incorporates an optical system which produces two light spots on an optical disk at positions spaced out from each other by, for example, half the radial span of the effective area of the disk. In recording or reproducing information using the two light spots, the inner light spot is moved to an unused track area provided in the innermost section of the disk, an auto-focusing servo system for the inner light spot is started, a control track provided near the unused area is read to judge the compatibility of the disk, and, only when the disk compatibility is verified, the outer light spot is moved to an unused track area provided in the outermost section of the disk, and an auto-focusing servo system for the outer light spot is started by making reference to a signal to the already operating inner auto-focusing servo system. Although the outer auto-focusing servo system is started at the outermost section where the vertical swing of the disk is pronounced, the disk swing can be inferred from the signal of the already operating inner auto-focusing servo system, and therefore it can be started stably even over the outer section with a large vertical swing at a timing of minimal swing imparted by the signal of the inner auto-focusing servo system.
    • 记录/再现头包括光学系统,该光学系统通过例如盘的有效区域的半径跨度在彼此间隔开的位置处在光盘上产生两个光点。 在使用两个光点记录或再现信息时,将内部光点移动到设置在盘的最内部的未使用的轨道区域,开始用于内部光点的自动聚焦伺服系统,附近设置的控制轨道 读取未使用区域以判断盘的兼容性,并且仅当验证了盘兼容性时,外部光点移动到设置在盘的最外部的未使用的轨道区域,并且自动聚焦伺服系统 通过参考已经运行的内部自动聚焦伺服系统的信号来启动外部光点。 虽然外部自动对焦伺服系统在盘的垂直摆动的最外侧开始,但是可以从已经运行的内部自动聚焦伺服系统的信号推断出盘摆动,因此可以开始 在由内部自动聚焦伺服系统的信号施加的最小摆动的时刻,稳定地稳定地在外侧部分上具有大的垂直摆动。