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    • 8. 发明授权
    • Method and apparatus for recording optically an information signal on a
record medium along tracks
    • 在记录介质上光学地记录信息信号的方法和装置
    • US4423495A
    • 1983-12-27
    • US301098
    • 1981-09-10
    • Tohru MushaKiichi KatoKenichi Ito
    • Tohru MushaKiichi KatoKenichi Ito
    • G02B7/28G11B7/09G11B7/12G11B7/125G11B7/135G11B7/1359G11B11/105G11B7/00
    • G11B7/0917G11B11/10506G11B11/10536G11B11/10576G11B7/0941G11B7/12G11B7/1359G11B2007/0919G11B7/0903
    • In a method and apparatus of recording optically an information signal on a disc along tracks by projecting a main beam modulated with the information signal onto the rotating disc by means of an objective lens, in order to obtain focussing and tracking error signals, a sub beam inclined with respect to the main beam is also projected onto the disc by means of the objective lens. The main and sub beams reflected by the video disc are made incident as parallel light fluxes upon a detection prism surface which is set substantially at a critical angle with respect to the main beam, but at an angle smaller or larger than the critical angle with respect to the sub beam, and two light fluxes of the reflected main beam which situate on respective sides of a boundary plane including the central light ray and perpendicular to a plane of incidence, and are reflected by the reflection surface are separately received by two light receiving regions which are divided along a boundary plane including the main beam reflected by the reflection surface and perpendicular to the plane of incidence. The focussing error signal is derived as a difference between output signals from the two light receiving regions. The sub beam transmitted through and refracted by the reflection surface is received by a light detector and the tracking error signal is derived by detecting a variation in a light amount of the sub beam impinging upon the light detector.
    • 在利用物镜将通过信息信号调制的主波束投射到旋转盘上的光盘上将信息信号光学记录在光盘上的方法和装置中,为了获得聚焦和跟踪误差信号, 相对于主光束倾斜也通过物镜投影到光盘上。 由视频盘反射的主光束和副光束作为平行光束入射到检测棱镜表面上,该检测棱镜表面基本上被设置为相对于主光束的临界角,但是以相对于主光束的临界角小于或大于 并且反射主光束的两个光束位于包括中心光线并且垂直于入射平面的边界平面的相应侧上并被反射表面反射的两个光束分别被两个光接收 沿着包括由反射面反射并垂直于入射平面的主光束的边界平面分割的区域。 聚焦误差信号被导出为来自两个光接收区域的输出信号之间的差。 由光检测器接收透射并被反射面折射的子光束,并且通过检测入射到光检测器上的子光束的光量的变化导出跟踪误差信号。
    • 10. 发明授权
    • Optical system for synthesizing plural light beams
    • 用于合成多个光束的光学系统
    • US4545651A
    • 1985-10-08
    • US454869
    • 1982-12-30
    • Kiichi KatoMasaharu Sakamoto
    • Kiichi KatoMasaharu Sakamoto
    • G02B27/10G02B27/28G11B7/08G11B7/12G11B7/135G11B7/1359G11B7/1392G11B7/1398G02B5/30
    • G11B7/1398G02B27/1006G02B27/14G02B27/144G02B27/28G11B7/08G11B7/1359G11B7/13922
    • In an optical system for synthesizing a plurality of light beams, a first light beam of parallel light rays emitted from a laser beam source is incident on an inclined face of a right angle prism through the prism. A second light beam of parallel light rays emitted from a laser beam source is incident to the inclined face at a predetermined angle of incidence. The first light beam is emitted to the inclined face at an angle of incidence equal to a critical angle so that the first light beam is totally inflected by the inclined face and transmitted in a predetermined direction. The second light beam is refracted at an angle of refraction substantially equal to the Brewster's angle, and then transmitted in a direction which defines a predetermined angular difference with the predetermined direction of the first light beam. A multi-layered film is formed on the inclined face. The film makes the angle of refraction of the second light beam approach the critical angle, so as to reduce the angular difference from that which would exist in the absence of the film.
    • 在用于合成多个光束的光学系统中,从激光束源发射的平行光线的第一光束通过棱镜入射到直角棱镜的倾斜面上。 从激光束发射的平行光线的第二光束以预定的入射角入射到倾斜面。 第一光束以等于临界角的入射角发射到倾斜面,使得第一光束被倾斜面完全折射并沿预定方向透射。 第二光束以基本上等于布鲁斯特角的折射角折射,然后沿与第一光束的预定方向限定预定角度差的方向透射。 在倾斜面上形成多层膜。 该胶片使第二光束的折射角接近临界角,从而减小与不存在胶片时所存在的角度差。