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    • 5. 发明授权
    • Turntable for record disc
    • 唱盘转盘
    • US4065135A
    • 1977-12-27
    • US697197
    • 1976-06-17
    • Robert L. Doughty
    • Robert L. Doughty
    • G11B17/028G11B3/60
    • G11B17/0281
    • A grooved vinyl record disc is securely held in a turntable which includes an annular platen having a rigid, very flat upper surface. Air is evacuated from the underside of the disc, although the platen is impervious to air, by means of annular grooves adjacent the inner and outer edges of the platen and connected through passageways defined in the turntable structure, and through a rotary fluid coupling to communicate with a vacuum source. Resilient seals are provided for isolating the grooves on the underside of the record from ambient air, and these seals support the record disc so it can be flattened as it is drawn downwardly onto the platen by the application of vacuum.
    • 带槽的乙烯基记录盘牢固地保持在转台中,该转台包括具有刚性非常平坦的上表面的环形压板。 空气从盘的下侧排出,尽管台板通过邻近台板的内边缘和外边缘的环形凹槽不受空气影响,并通过限定在转盘结构中的通道连接,并通过旋转流体联接器进行通信 与真空源。 提供了弹性密封件,用于将记录下侧的凹槽与环境空气隔离开,并且这些密封件支撑记录盘,使其可以通过施加真空向下拉到压板上而变平。