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    • 1. 发明授权
    • Temperature stable semiconductor bulk acoustic resonator
    • 温度稳定的半导体体声波谐振器
    • US5283458A
    • 1994-02-01
    • US859768
    • 1992-03-30
    • Robert B. StokesKei-fung LauJames Chung-Kei Lau
    • Robert B. StokesKei-fung LauJames Chung-Kei Lau
    • H03H9/17H01L29/66
    • H03H9/172
    • This invention discloses a semiconductor bulk acoustic resonator including at least one thin film piezoelectric layer positioned on a semiconductor substrate. The acoustic resonator includes a heating ring positioned around the outer perimeter of the piezoelectric layer in order to heat the piezoelectric layer to a desirable elevated temperature. A heat sensing film fabricated on the piezoelectric layer monitors the temperature of the piezoelectric layer such that the heating ring maintains the piezoelectric layer at a constant temperature. By this, an oscillator circuit using this semiconductor bulk acoustic resonator as the frequency controlling element can maintain a constant frequency over a wide range of temperatures which may affect frequency stability.
    • 本发明公开了一种半导体体声波谐振器,其包括位于半导体衬底上的至少一个薄膜压电层。 声谐振器包括围绕压电层的外周定位的加热环,以便将压电层加热到期望的高温。 制造在压电层上的感热膜监测压电层的温度,使得加热环将压电层保持在恒定温度。 由此,使用该半导体体声波谐振器作为频率控制元件的振荡电路能够在可能影响频率稳定性的宽温度范围内保持恒定的频率。
    • 5. 发明授权
    • Apparatus for bending a flexible conduit
    • 用于弯曲柔性导管的装置
    • US6133811A
    • 2000-10-17
    • US310362
    • 1999-05-12
    • James Chung-Kei Lau
    • James Chung-Kei Lau
    • H01P3/14H01P11/00
    • H01P3/14H01P11/002
    • A bending mechanism for flexible waveguide uses a combination of an elongate arm (1), two short bracket arms (3 & 7) and a gear train (5, 11, 13 & 9) linking the bracket arms to bend a flexible waveguide (24) over a range of positions. The bend is formed to the shape of a circular arc the radius of which varies with the position. Each short bracket arm is pivotally connected (15 & 17) to a respective end of the elongate arm and to a respective one of the waveguide's two end flanges (23 & 25). Each bracket arm contains a gear that rotates with the respective bracket arm about the bracket arm's pivot; and an even number of gears interlinks those gears whereby pivotal movement of one of the flanges in a clockwise direction produces an effective relative pivotal movement of the other flange. The bending mechanism allows for as much as 180 degrees of repetitive reciprocal rotation of one flange relative to the other without imposing significant stress on the flexible waveguide, providing an ideal long lasting interface between a mechanically scanning microwave antenna and a microwave transmitter/receiver.
    • 用于柔性波导的弯曲机构使用细长臂(1),两个短支架臂(3和7)和连接支架臂的齿轮系(5,11,13和9)的组合,以弯曲挠性波导(24 )在一系列的位置。 弯曲形成为其半径随位置变化的圆弧形状。 每个短支架臂被枢转地连接(15和17)到细长臂的相应端部和波导的两个端部凸缘(23和25)中的相应一个。 每个支架臂都包含一个齿轮,该齿轮与支架臂绕支架臂的枢轴转动; 并且偶数个齿轮将这些齿轮相互连接,从而沿着顺时针方向的一个凸缘的枢转运动产生另一个凸缘的有效的相对枢转运动。 弯曲机构允许一个凸缘相对于另一个凸缘的重复往复旋转多达180度,而不会在柔性波导上施加显着的应力,从而在机械扫描微波天线和微波发射器/接收器之间提供理想的持久接口。
    • 6. 发明授权
    • Apparatus for bending a flexible conduit
    • 用于弯曲柔性导管的装置
    • US5289710A
    • 1994-03-01
    • US929254
    • 1992-08-12
    • James Chung-Kei Lau
    • James Chung-Kei Lau
    • B21D11/10H01P11/00B21D7/00H01P1/02
    • H01P11/002B21D11/10Y10T29/49016
    • An apparatus for the bending of a flexible conduit having first and second ends includes first and second assemblies which are fixed for relative rotation with the first and second ends. An axis of rotation passes through the first and second assemblies. The apparatus further includes a driven gear fixed for rotation with the first assembly. The driven gear is adapted to cooperate with a drive gear to rotate the first assembly with respect to the second assembly. The first assembly includes a first extendable portion which attaches directly to the first end. Similarly, the second assembly includes a second extendable portion which attaches directly to the second end. The first and second assemblies function to vary the distance between the axis of rotation and the first and second ends as the first assembly is rotated with respect to the second assembly.
    • 用于弯曲具有第一和第二端部的柔性导管的装置包括第一和第二组件,其被固定成与第一和第二端部相对旋转。 旋转轴线穿过第一和第二组件。 该装置还包括固定成与第一组件一起旋转的从动齿轮。 从动齿轮适于与驱动齿轮协作以相对于第二组件旋转第一组件。 第一组件包括直接附接到第一端的第一可延伸部分。 类似地,第二组件包括直接附接到第二端的第二可延伸部分。 当第一组件相对于第二组件旋转时,第一和第二组件用于改变旋转轴线与第一和第二端部之间的距离。