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    • 72. 发明授权
    • Semiconductor optical waveguide type switch including light control means
    • 包括光控制装置的半导体光波导型开关
    • US5329601A
    • 1994-07-12
    • US993698
    • 1992-12-21
    • Shigeru Nakamura
    • Shigeru Nakamura
    • G02F1/025G02B6/12G02B6/122G02B6/34G02F1/01G02F1/225G02F1/313G02F1/35G02B6/26
    • G02F1/3133G02B6/122G02F1/2257G02B2006/12078G02B2006/12159G02F1/0126
    • A semiconductor waveguide type all-optical switch of a simple structure which can switch at high speed with low switching energy. A waveguide is formed within a core layer made of a semiconductor for absorbing controlling light when an electric field is applied, and a pair of electrodes are formed for applying a voltage to a waveguide part where a refractive index change is to be caused. The controlling light together with controlled light is entered in the waveguide. When a voltage is applied, Franz-Keldysh effect causes the wavelength at the optical absorption spectrum edge in the refractive index change part to shift to the long wavelength side. If light of a wavelength satisfying a predetermined condition is used as the controlling light, the controlling light is absorbed only in the refractive index change part for changing the refractive index in the part, thus the controlled light is switched. Preferably, a p-i-n structure is adopted.
    • 一种结构简单的半导体波导型全光开关,可以高速切换低开关能量。 在由用于在施加电场时吸收控制光的由半导体制成的芯层内形成波导,并且形成一对电极以向要引起折射率变化的波导部分施加电压。 控制光与可控光一起进入波导管。 当施加电压时,Franz-Keldysh效应使折射率变化部分中的光吸收光谱边缘处的波长移向长波长侧。 如果使用满足预定条件的波长的光作为控制光,则控制光仅在折射率变化部分被吸收,以改变该部分中的折射率,从而切换受控光。 优选地,采用p-i-n结构。
    • 77. 发明授权
    • Optical tape apparatus with a tracking control mechanism and/or a
focusing control mechanism
    • 具有跟踪控制机构和/或聚焦控制机构的光带装置
    • US4970707A
    • 1990-11-13
    • US239389
    • 1988-09-01
    • Fumio HaraYoshito TsunodaShigeru NakamuraYoshizumi EtoSeiichi MitaMorishi IzumitaHiroyuki TsuchinagaMasuo Kasai
    • Fumio HaraYoshito TsunodaShigeru NakamuraYoshizumi EtoSeiichi MitaMorishi IzumitaHiroyuki TsuchinagaMasuo Kasai
    • G11B7/003G11B7/09
    • G11B7/09G11B7/0031G11B7/0925
    • An optical tape apparatus having improved focus and tracking control. An optical head records, reproduces, or rewrites data on an optical tape by helically scanning the tape with a laser beam. A guide plate is disposed between the optical head and the tape to prevent the beam from becoming unfocused due to fluctuation of the tape cuased by an air film between the optical head and the tape. The optical head contains a semiconductor laser and an optical system exhibiting chromatic aberration for directing the laser beam onto the tape. The optical system includes a condenser lens for focusing the beam onto the tape. Fine focus control is achieved by changing the wavelength of the laser beam by directing part of the beam reflected from the tape back to the laser, thereby changing the focal point of the beam by virtue of the chromatic aberration of the optical system. Coarse focus control is achieved by mounting the condenser lens on a piezoelectric actuator which moves the consenser lens to focus the beam onto the tape. A recording head for recording timing marks and tracking signals on the tape is disposed in advance of the optical head. A reading head reads the timing marks and the optical head reads the tracking signals. The timing marks and tracking signals are used to control the operation of the apparatus such that the tape is transported with a constant speed and data on diagonal signal tracks on the tape is accurately recorded, reproduced, or rewritten.
    • 具有改进的聚焦和跟踪控制的光带装置。 光学头通过用激光束螺旋扫描磁带来记录,再现或重写光学带上的数据。 引导板设置在光头和带之间,以防止由于光头和带之间的空气膜带来的带的波动而导致光束不聚焦。 光头包含半导体激光器和具有用于将激光束引导到带上的色差的光学系统。 光学系统包括用于将光束聚焦到胶带上的聚光透镜。 通过将从带反射的光束的一部分引回到激光器来改变激光束的波长,从而通过光学系统的色差来改变光束的焦点来实现精细对焦控制。 通过将聚光透镜安装在压电致动器上来实现粗调焦控制,该压电致动器移动辅助透镜以将光束聚焦到带上。 在光学头之前设置用于在带上记录定时标记和跟踪信号的记录头。 读头读取定时标记,光头读取跟踪信号。 定时标记和跟踪信号用于控制装置的操作,使得磁带以恒定速度传送,并且磁带上对角线信号轨道上的数据被精确地记录,再现或重写。
    • 78. 发明授权
    • Optical head and optical information processor using the same
    • 光头和光信息处理器使用相同
    • US4873678A
    • 1989-10-10
    • US130637
    • 1987-12-09
    • Shigeru NakamuraSadatsugi MachidaTsuyoshi Toda
    • Shigeru NakamuraSadatsugi MachidaTsuyoshi Toda
    • G11B7/09G11B7/12G11B7/135G11B11/105
    • G11B7/1381G11B11/10541G11B7/0908G11B7/0916G11B7/12G11B7/1356
    • An optical head and an optical information processor using the optical head include a light source, focusing device for focusing a light beam which is emitted from the light source, on an information medium, beam separator for isolating at least part of a light beam which is reflected from the information medium, from the light beam emitted from the light source, a beam splitter including a first polarized-light separating film which is illuminated with about a half of a light beam isolated by the beam separator, and a light detecting device having a first photodetector which receives a first light beam reflected from the first polarized-light separating film, and a second photodetector which receives a second light beam passing through the first polarized-light separating film, in a state that at least one of the first and second photodetectors is separated into a pair of light detecting elements, to make it possible to detect a magneto-optical signal and a focal error signal by the same optical system.
    • 使用光头的光头和光信息处理器包括:光源,用于将从光源发射的光束聚焦在信息介质上的聚焦装置;用于隔离至少部分光束的光束分离器; 从信息介质反射的从光源发射的光束,分束器包括用由分束器隔离的光束的大约一半被照射的第一偏振光分离膜;以及光检测装置,具有 接收从第一偏振光分离膜反射的第一光束的第一光电检测器和接收通过第一偏振光分离膜的第二光束的第二光电检测器,处于第一和第二偏振光分离膜中的至少一个 第二光电检测器被分离成一对光检测元件,以便可以通过s检测磁光信号和焦点误差信号 ame光学系统。