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    • 76. 发明授权
    • Optical disc reproducing apparatus which employs a binary detector for
the outer tracks and a ternary detector for the inner tracks
    • 使用外轨道的二进制检测器和内轨道的三元检测器的光盘再现装置
    • US5559774A
    • 1996-09-24
    • US795724
    • 1991-11-21
    • Tetsu WatanabeTamotsu YamagamiYoshiyuki Urakawa
    • Tetsu WatanabeTamotsu YamagamiYoshiyuki Urakawa
    • G11B7/005G11B20/10G11B5/09
    • G11B7/005G11B20/10009
    • An apparatus reproducing signals recorded on an optical disc rotated at a constant angular velocity. The apparatus employs a binary detector for forming digital data by comparing the reproduced signal with a predetermined threshold level, and a ternary detector for forming reproduced data from two series of digital data detected by comparing the reproduced signal with two different threshold levels of predetermined values. The reproduced data from an outer portion of the disc is detected by the binary detector, while the reproduced data from an inner portion of the disc is detected by the ternary detector. The playback output is selectively switched in response to an address signal of a specific track where the phase margin of the reproduced data detected by the binary detector and the phase margin of the reproduced data detected by the ternary detector becomes substantially equal to each other.
    • 记录在以恒定角速度旋转的光盘上的信号的装置。 该装置采用二进制检测器,用于通过将再现信号与预定阈值电平进行比较来形成数字数据;以及三进制检测器,用于通过将再现信号与预定值的两个不同阈值电平进行比较而检测的两个数字数据序列形成再现数据。 来自盘的外部的再现数据由二进制检测器检测,而来自盘的内部的再现数据由三元检测器检测。 响应于由二进制检测器检测到的再现数据的相位裕度和由三元检测器检测到的再现数据的相位裕度彼此基本相等的特定轨道的地址信号来选择性地切换回放输出。
    • 77. 发明授权
    • Brushless DC motor
    • 无刷直流电机
    • US4409526A
    • 1983-10-11
    • US209145
    • 1980-11-21
    • Hiroyuki YamauchiTamotsu Yamagami
    • Hiroyuki YamauchiTamotsu Yamagami
    • H02P6/08H02K29/00
    • H02P6/085
    • A brushless DC motor having a rotor magnet magnetized to provide a sinusoidal magnetic field and two-phase stator windings at positions which differ from each other by an electrical angle which is an odd multiple of 90.degree. is provided with a drive circuit comprising a signal generator with an output having a frequency determined by the rotational speed of the rotor, and a memory having stored therein digital information data converted from sampled values of a sinusoidal signal free of distortion. The digital information data stored in the memory is read out therefrom by the output of the signal generator in synchronism with the magnetic field from the rotor magnet, and such read-out information data is employed to determine currents flowing through the stator windings so that torque ripple is substantially eliminated.
    • 具有被磁化以在彼此不同的电角度为90度的奇数倍的位置处提供正弦磁场和两相定子绕组的转子磁体的无刷直流电动机设置有包括信号发生器的驱动电路 输出具有由转子的旋转速度确定的频率,以及存储器,其中存储有从没有失真的正弦信号的采样值转换的数字信息数据。 存储在存储器中的数字信息数据通过信号发生器的输出与来自转子磁体的磁场同步地读出,并且使用这种读出信息数据来确定流过定子绕组的电流,使得转矩 纹波基本消除。
    • 79. 发明授权
    • Method of, and apparatus for, recording address information to disc medium
    • 将地址信息记录到盘介质的方法和装置
    • US08270267B2
    • 2012-09-18
    • US13109466
    • 2011-05-17
    • Shoei KobayashiNobuyoshi KobayashiTamotsu YamagamiShinichiro Iimura
    • Shoei KobayashiNobuyoshi KobayashiTamotsu YamagamiShinichiro Iimura
    • G11B7/00
    • G11B27/24G11B7/0053G11B7/24082G11B20/1833G11B27/19
    • In step S1, the address generator generates address information composed of a sync signal which is recorded on an optical disc, address data and an error correction code for the address data, pre-encodes and supplies it to a modulator. At the same time, a carrier signal generator generates a carrier signal which is to carry the address information, and supplies it to the modulator. In step S2, the modulator makes MSK modulation of the carrier signal supplied from the carrier signal generator on the basis of the pre-encoded address information supplied from the address generator, and supplies a resultant MSK modulation signal to a wobbling unit. In step S3, the wobbling unit forms, on the optical disc, a spiral groove wobbled adaptively to the MSK modulation signal supplied from the modulator. In this optical disc, a given address can be accessed quickly and accurately.
    • 在步骤S1中,地址发生器产生由记录在光盘上的同步信号,地址数据和地址数据的纠错码组成的地址信息,并对其进行编码并将其提供给调制器。 同时,载波信号发生器产生携带地址信息的载波信号,并将其提供给调制器。 在步骤S2中,调制器根据从地址发生器提供的预先编码的地址信息,对从载波信号发生器提供的载波信号进行MSK调制,并将结果MSK调制信号提供给摆动单元。 在步骤S3中,摆动单元在光盘上形成自适应于从调制器提供的MSK调制信号摆动的螺旋槽。 在该光盘中,可以快速准确地访问给定的地址。