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    • 12. 发明授权
    • Signal pickup device in a rotary recording medium reproducing apparatus
    • 旋转记录介质再现装置中的信号拾取装置
    • US4410976A
    • 1983-10-18
    • US291047
    • 1981-08-07
    • Masayoshi UchidaOsamu Tajima
    • Masayoshi UchidaOsamu Tajima
    • G11B3/46G11B9/06
    • G11B3/46
    • A signal pickup device in a rotary recording medium reproducing apparatus, comprises a cantilever provided with a reproducing element for picking up and reproducing a signal from a rotary recording medium at the tip end thereof, a support member having a support part for supporting the rear end part of the cantilever, and arms which unitarily extend on both sides from the support part, and a frame having engaging parts engaged with and mounted with the arms of the support member, for holding the arms. The arms of the support member respectively are provided with mounting parts having non-circular cross-section in the vicinity of the end part thereof, for engaging with the engaging parts of the frame. Moreover, the mounting parts and the engaging parts are shaped so that the support member is at an angular position together with the cantilever where the reproducing element is at a raised position, when the mounting parts are mounted onto the engaging parts.
    • 一种旋转记录介质再现装置中的信号拾取装置,包括悬臂,其具有用于拾取和再现来自其顶端的旋转记录介质的信号的再现元件;支撑构件,具有用于支撑后端 悬臂的一部分和从支撑部分两侧一体地延伸的臂,以及具有与支撑构件的臂接合并与其一起安装的用于保持臂的框架。 支撑构件的臂分别在其端部附近设置有具有非圆形横截面的安装部分,用于与框架的接合部分接合。 此外,当将安装部件安装到接合部件上时,安装部件和接合部件被成形为使得支撑部件与再现元件处于升高位置的悬臂一起处于角位置。
    • 18. 发明授权
    • Device for feedback controlling focus of an optical system in an
information recording/reproducing apparatus
    • 用于在信息记录/再现装置中控制光学系统的焦点的反馈控制装置
    • US4504938A
    • 1985-03-12
    • US367035
    • 1982-04-07
    • Osamu Tajima
    • Osamu Tajima
    • G11B7/08G11B7/09G11B7/12G11B7/00
    • G11B7/12G11B7/08G11B7/0908G11B7/0917
    • In a feedback focus control system of an information recording/reproducing apparatus, an interference filter is disposed in the path of the light reflected at an optical disk so that the reflected light is transmitted through or reflected at the interference filter before it is received by a composite optical detector having a plurality of photosensitive elements. In one embodiment, the interference filter is inclined with respect to the optical axis so that the intensity of the transmitted or reflected light is positioned at a steep slope portion of an intensity vs phase difference characteristic curve. Two photosensitive elements are provided to detect the difference in intensity of the transmitted or reflected light at two portions on both sides of the optical axis. In another embodiment, an interference filter having two portions which are respectively inclined in opposite direction is used, while the optical detector comprises four photosensitive elements arranged in the form of four-quadrant. In another embodiment the light transmitted through the interference filter and light reflected at the same are respectively detected by two optical detectors each having two photosensitive elements.
    • 在信息记录/再现装置的反馈焦点控制系统中,干涉滤光器设置在光盘反射的光的路径中,使得反射光在被干涉滤光片接收之前被透射通过或反射 复合光学检测器具有多个感光元件。 在一个实施例中,干涉滤光器相对于光轴倾斜,使得透射或反射光的强度位于强度对相位差特性曲线的陡峭部分。 提供两个感光元件以检测在光轴两侧的两个部分处的透射或反射光的强度差异。 在另一个实施例中,使用具有分别相反方向倾斜的两个部分的干涉滤光器,而光学检测器包括以四象限形式布置的四个感光元件。 在另一个实施例中,透过干涉滤光器的光和在其上反射的光分别由具有两个感光元件的两个光学检测器检测。