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    • 46. 发明授权
    • Laser diode for producing an optical beam at a visible wavelength
    • 用于产生可见波长的光束的激光二极管
    • US5241553A
    • 1993-08-31
    • US817446
    • 1992-01-06
    • Hitoshi Tanaka
    • Hitoshi Tanaka
    • H01S5/00H01S5/223H01S5/323
    • H01S5/32325H01S5/2231
    • A laser diode comprises a substrate of gallium arsenide, doped to a first conductivity type and extending in a longitudinal direction, a first clad layer provided on the substrate and doped to the first conductivity type, an active layer of a mixed crystal having a second band gap that is smaller than a band gap of the first clad layer and containing elements of boron, gallium, indium and a group V element, the active layer being provided on the first clad layer and extending in the longitudinal direction for producing a coherent optical beam in the longitudinal direction as a result of the stimulated emission with a visible wavelength, a second clad layer having a band gap larger than the band gap of the active layer and provided on the active layer with a second conductivity type opposite to the first conductivity type, a first electrode provided on the second clad layer for injecting carriers of a first type therein, a second electrode provided on a lower major surface of the substrate for injecting carriers of a second, opposite type therein; and reflection structures provided for establishing an optical resonance in the active layer.
    • 激光二极管包括掺杂到第一导电类型并沿纵向延伸的砷化镓衬底,设置在衬底上并掺杂到第一导电类型的第一覆盖层,具有第二带的混合晶体的有源层 间隙小于第一包层的带隙并且包含硼,镓,铟和第V族元素的元素,活性层设置在第一包层上并沿纵向延伸以产生相干光束 作为受到可见波长的受激发射的纵向的第二覆盖层,具有比有源层的带隙大的带隙的第二覆盖层,并且在具有与第一导电类型相反的第二导电类型的有源层上提供 设置在第二覆层上的第一电极,用于在其中注入第一类型的载流子,设置在该基底的下主表面上的第二电极 用于在其中注入第二相对类型的载体; 以及用于在有源层中建立光学共振的反射结构。
    • 48. 发明授权
    • Zoom lens barrel
    • 变焦镜头镜筒
    • US4974949A
    • 1990-12-04
    • US285030
    • 1988-12-16
    • Hitoshi Tanaka
    • Hitoshi Tanaka
    • G02B7/10
    • G02B7/102
    • A zoom lens barrel wherein first and second lens groups are moved through different distances along an optical axis in interlocking relation to each other to effect zooming. A device for supporting the second lens group is supported by a device for supporting the first lens group in such a manner that the second lens group supporting device is movable along the optical axis relative to the first lens group supporting device. When a drive ring for driving the first lens group supporting device is activated, the first lens group supporting device is moved forward or rearward along the optical axis in response to the rotation of the drive ring and, at the same time, a drive cam device for driving the second lens group supporting device to move along the optical axis relative to the first lens group supporting device is caused to rotate around the optical axis by the drive ring.
    • 一种变焦镜头镜筒,其中第一透镜组和第二透镜组以彼此互锁的关系沿光轴移动不同的距离以实现变焦。 用于支撑第二透镜组的装置由用于支撑第一透镜组的装置支撑,使得第二透镜组支撑装置可相对于第一透镜组支撑装置沿光轴移动。 当用于驱动第一透镜组支撑装置的驱动环被激活时,响应于驱动环的旋转,第一透镜组支撑装置沿着光轴向前或向后移动,并且同时,驱动凸轮装置 用于驱动第二透镜组支撑装置沿相对于第一透镜组支撑装置的光轴移动的驱动环绕光轴旋转。
    • 50. 发明授权
    • Sintered ceramic dielectric body
    • 烧结陶瓷绝缘体
    • US4058404A
    • 1977-11-15
    • US613739
    • 1975-09-16
    • Shinobu FujiwaraHitoshi Tanaka
    • Shinobu FujiwaraHitoshi Tanaka
    • C04B35/465C04B35/475H05K1/03C04B35/00C04B35/46
    • C04B35/465C04B35/475H05K1/0306
    • A sintered ceramic dielectric body is provided which exhibits a high dielectric constant as well as a low dielectric loss and almost no variation in the dielectric constant and the dielectric loss with respect to a wide variation of an applied high AC or DC voltage, respectively. The ceramic dielectric composition consists essentially, by weight, of approximately 18 to 70% of strontium titanate (SrTiO.sub.3), approximately 4 to 75% of barium titanate (BaTiO.sub.3), 2.5 to 17.4% of bismuth oxide (Bi.sub.2 O.sub.3) and 1.7 to approximately 20% of titanium oxide (TiO.sub.2); the ratio by mole of the titanium oxide (TiO.sub.2) to the bismuth oxide (Bi.sub.2 O.sub.3) being within the range from approximately 1 to 18.
    • 提供一种烧结陶瓷电介质体,其分别具有高介电常数以及低的介电损耗,并且相对于所施加的高AC或DC电压的宽变化,介电常数和介电损耗几乎不变化。 陶瓷电介质组合物基本上由重量百分比组成的钛酸锶(SrTiO 3)的约18〜70%,钛酸钡(BaTiO 3)的4〜75%,氧化铋(Bi 2 O 3)的2.5〜17.4%,氧化铋(Bi 2 O 3)的1.7〜20 %的氧化钛(TiO2); 氧化钛(TiO 2)与氧化铋(Bi 2 O 3)的摩尔比在约1〜18的范围内。