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    • 3. 发明授权
    • Two-dimensional suspension
    • 二维悬挂
    • US4538882A
    • 1985-09-03
    • US418385
    • 1982-09-15
    • Shinichi TanakaNamio Hirose
    • Shinichi TanakaNamio Hirose
    • F16F15/06F16F1/18F16F1/26F16F15/073G11B7/09G11B21/20G11B21/21G12B3/04G11B7/08G11B17/32
    • G11B7/0932F16F1/26F16F15/073G12B3/04
    • A two-dimensional (2-D) suspension system consists of series of rhomboidal parallel leaf springs (RPLSs) each of which comprises plural leaf springs apart from one another and at least two rigid walls for fixing both ends of the leaf springs at the same fixing angle selected not to be a right angle and to be different from fixing angles of other rhomboidal parallel leaf springs. Plural rhomboidal parallel leaf springs are linked in series by connecting the rigid walls in such a way that faces of all the leaf springs are perpendicular to an imaginary plane. The 2-D suspension system suspends a movable body which is allowed translation in a plane only and which is restricted in other motions. The mass of the rigid body connecting two RPLSs is so small that the resonance of the rigid body hardly interferes with the motion of the movable body. The 2-D suspension system can hold the movable body at both sides thereof in symmetry. This symmetric 2-D suspension system is useful for a position control system, especially for an actuator of optical information read head which needs a tracking and focussing control of high precision without tilt of the optical axis.
    • 二维(2-D)悬挂系统由一系列菱形平行板弹簧(RPLS)组成,每个板簧包括彼此分开的多个板簧和至少两个刚性壁,用于固定板簧的两端 选定的固定角度不是直角,并且与其他菱形平行板簧的固定角度不同。 多个菱形平行板簧通过连接刚性壁以使得所有板簧的面垂直于假想平面的方式串联连接。 2-D悬挂系统悬挂可移动体,该移动体仅允许在平面中平移并且在其它运动中被限制。 连接两个RPLS的刚体的质量很小,使得刚体的共振几乎不干扰可移动体的运动。 2-D悬挂系统可以将移动体的两侧保持对称。 这种对称的2-D悬架系统对于位置控制系统是有用的,特别是对于光信息读取头的致动器,其需要高精度的跟踪和聚焦控制而没有光轴的倾斜。
    • 4. 发明授权
    • Optical signal reproducing apparatus
    • 光信号重放装置
    • US4504934A
    • 1985-03-12
    • US305346
    • 1981-09-24
    • Shinichi TanakaIkuo MatsudaNamio HiroseKazutsugu Kobayashi
    • Shinichi TanakaIkuo MatsudaNamio HiroseKazutsugu Kobayashi
    • G11B11/18
    • G11B11/18
    • In an optical signal reproducing apparatus for a conventional disc phonograph record, the groove of said record is irradiated with the light beam from a direction that varies cyclically at a constant frequency in a plane. Said plane includes both the tangential velocity vector of the groove and a normal line to the surface of the groove. At the moment that the light beam irradiates the surface of the groove from a perpendicular direction, the reflected light beam traces back the same path as that of the irradiating light beam. When a photo-detector is limited by a slit to detect only the reflected light beam tracing back the same path as the irradiating light beam, the photo-detector detects light pulses which are pulse-phase-modulated by the slope angle of the surface of the groove. The recorded signal can be reproduced by demodulating said pulse-phase-modulated pulses.
    • 在用于常规唱盘唱片记录的光信号再现装置中,所述记录的凹槽用平面中恒定频率周期性变化的方向用光束照射。 所述平面包括凹槽的切向速度矢量和与凹槽表面的法线。 在光束从垂直方向照射槽的表面的那一刻起,反射光束跟踪与照射光束相同的路径。 当光检测器被狭缝限制以仅检测跟照射光束跟踪相同路径的反射光束时,光检测器检测由脉冲相位调制的光脉冲, 凹槽 可以通过对所述脉冲相位调制脉冲进行解调来再现所记录的信号。
    • 6. 发明授权
    • Information read apparatus with tracking control system
    • 具有跟踪控制系统的信息读取装置
    • US4488276A
    • 1984-12-11
    • US339509
    • 1982-01-15
    • Shinichi TanakaNamio Hirose
    • Shinichi TanakaNamio Hirose
    • G02B7/28G11B7/09G11B21/10H04N5/76G11B7/00G11B21/00
    • G11B21/10G11B7/0904
    • An information read apparatus with tracking control system comprises a first closed loop and a second closed loop. The first closed loop performs high speed tracking control and feedback compensation for damping the tracking control system, with the aid of a means for detecting the tracking error without excess frequency dependency. The second closed loop performs precise tracking control with the aid of tracking error detection by wobbling the reading position on the information carrier in a direction traverse to the information track being read. The second closed loop is dominant only in the low frequency region. Since the second closed loop is negligible in comparison with the first closed loop near the cross-over frequency of the tracking control system, phase lag of the second closed loop is allowable about said cross-over frequency. Therefore, the wobbling frequency can be selected so low that the same actuator that controls the global reading position can be used for wobbling. In this way, the tracking control system performs both of high precision control and high speed control.
    • 具有跟踪控制系统的信息读取装置包括第一闭环和第二闭环。 第一个闭环执行高速跟踪控制和反馈补偿,用于阻尼跟踪控制系统,借助于一种用于检测跟踪误差的装置,而不会有过多的频率依赖性。 第二闭环借助于通过摆动在信息载体上的读取位置沿着所读取的信息轨道的方向进行跟踪误差检测来执行精确跟踪控制。 第二闭环仅在低频区域是主要的。 由于与跟踪控制系统的交叉频率附近的第一闭环相比,第二闭环可以忽略不计,因此关于所述交叉频率允许第二闭环的相位滞后。 因此,摆动频率可以选择得如此之低,使得控制全局读取位置的相同致动器可以用于摆动。 以这种方式,跟踪控制系统既执行高精度控制又实现高速控制。