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    • 92. 发明授权
    • Magneto-optical disc memory apparatus including a header signal and
magneto-optical signal level adjusting circuit
    • 磁光盘存储装置,包括标题信号和磁光信号电平调整电路
    • US5161135A
    • 1992-11-03
    • US617006
    • 1990-11-21
    • Atsushi SaitoMasahiro OjimaMasaru Ito
    • Atsushi SaitoMasahiro OjimaMasaru Ito
    • G11B7/004G11B7/007G11B7/013G11B7/09G11B7/26G11B11/105G11B13/04
    • G11B7/261G11B11/10565G11B11/10578G11B13/04G11B13/045G11B7/00745G11B7/0938G11B7/24076G11B7/24079G11B7/24085
    • A record carrier for recording, reproducing and erasing information. A circular disc-like substrate has a recording layer thereon such that information is written onto the recording layer by changing the direction of magnetization. A guide groove of a plurality of tracks is formed in advance and extends in the radial direction with intervals therebetween. Each track of the guide groove is divided into a plurality of sectors, each of which includes a header portion in which a header signal containing an address for distinguishing at least said sector is formed in advance with pits of a phase structure and a data portion adjacent to said header portion. The guide groove serves as an optical guide for a light beam which records, reproduces and erases information onto the data portion. A first detection system for detecting the light intensity of the reflected light from the record carrier and a second detection system for detecting the direction of polarization of the reflected light from the record carrier, and a level adjustment circuit for adjusting the levels of the header signal detected by the first detection system and the data signal detected by the second detection system are incorporated in this apparatus, whereby recording, reproducing and erasing information of any number of sectors are enabled.
    • 用于记录,再现和擦除信息的记录载体。 圆盘状基板上具有记录层,通过改变磁化方向将信息写入记录层。 预先形成多个轨道的引导槽,并且在径向方向上间隔地延伸。 引导槽的每个轨道被分成多个扇区,每个扇区包括一个报头部分,其中包含用于区分至少所述扇区的地址的报头信号预先由相位结构的凹点和相邻的数据部分形成 到所述头部。 引导槽用作光束的光导,其将信息记录,再现和擦除到数据部分上。 用于检测来自记录载体的反射光的光强度的第一检测系统和用于检测来自记录载体的反射光的偏振方向的第二检测系统,以及用于调整标题信号的电平的电平调节电路 由第一检测系统检测到的和由第二检测系统检测的数据信号被并入该装置中,由此启用任何数量的扇区的记录,再现和擦除信息。