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    • 93. 发明授权
    • Dispersive delay lines operating in the shear mode
    • 在剪切模式下操作的分散延迟线
    • US3719906A
    • 1973-03-06
    • US3719906D
    • 1970-11-12
    • THOMSON CSF
    • TOURNOIS P
    • G02B27/44H03H9/145H03H9/17H04R17/08H03H7/30
    • H03H9/17G02B27/4233H04R17/08
    • A wave transmission medium has a pair of wave coupling arrays (41, 42) coupled thereto, each including a plurality of rectilinear, co-planar parallel excitation elements, spaced from each other by a predetermined distance a; the wave reception array being located on the transmission medium with respect to the wave transmission array to receive waves at an angle Alpha transmitted into said medium, when a transversely polarized wave is applied to the transmission array, with a direction of oscillations parallel to the co-planar excitation elements; the angle Alpha having a predetermined relation to the wavelength and propagation velocity of waves within the medium.
    • 波传播介质具有耦合到其上的一对波耦合阵列(41,42),每一个耦合阵列(41,42)均包括彼此间隔开预定距离a的多个直线,共平面的平行激励元件; 所述波接收阵列相对于所述波发射阵列位于所述传输介质上,以便当传输到所述介质上的角度α接收波时,当将横向极化波施加到所述传输阵列时,所述波形的平行于所述传播阵列的振荡方向 平面激发元件; 角度α与介质内的波的波长和传播速度具有预定的关系。
    • 94. 发明授权
    • Dual-stylus phonograph cartridge
    • 双立体摄影机
    • US3582087A
    • 1971-06-01
    • US3582087D
    • 1969-04-22
    • ZENITH RADIO CORP
    • BELLA DAVIDKESSLER SEYMOUR
    • H04R17/08G11B3/02
    • H04R17/08
    • A phonograph cartridge having a dual-stylus assembly of the turret type wherein one stylus is designed to track stereo record grooves and the other stylus is designed to track monaural record grooves. The cartridge housing has a vertical opening therein and a recessed portion at the base of the opening which forms a seat. A turret shaft is supported in the opening and is axially and rotatably movable therein. The shaft has a pair of cantilever stylus support arms attached to its free end. The turret assembly is adapted for rotation to a predetermined orientation in order to selectively place one of the styli in a record tracking position. A spring is provided for biasing the turret shaft axially and upwardly into the seat to releasably maintain this orientation. Two cam surfaces are provided at the base of the turret shaft to operatively engage the sidewalls of the seat such that, upon mere rotation of the turret shaft, the spring bias is overcome to release the turret assembly from its orientation and permit rotation thereof to place the other stylus in a recordtracking position.