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3 条记录 (耗时 0.016 秒)

    Optical pickup apparatus having switch for allowing positional adjustment
    1.
    发明授权
    Optical pickup apparatus having switch for allowing positional adjustment 失效
    具有用于允许位置调整的开关的光学拾取装置

    公开(公告)号：US4972400A

    公开(公告)日：1990-11-20

    申请号：US173949

    申请日：1988-03-28

    申请人： Toru Kuwabara ,  Kazuo Hirasawa ,  Kiyomitsu Nishimura

    发明人： Toru Kuwabara ,  Kazuo Hirasawa ,  Kiyomitsu Nishimura

    IPC分类号： G11B7/12 ,  G11B7/13

    CPC分类号： G11B7/13 ,  G11B7/123

    摘要： The invention comprises an optical pickup apparatus including a photodetector which detects a laser beam reflected from information tracks of a disk and an amplifier circuit which amplifies the outputs of the photodetector. The photodetector and the amplifier circuit are integrally combined. A preamplifier circuit is also provided for positional adjustments. A switch is included within the amplifier for alternately inhibiting the path of the outputs of the photodetector to the amplifier circuit to allow for positional adjustment with the preamplifier and enabling the path of the outputs of the photodetector to the amplifier circuit for normal operation.

    摘要翻译： 本发明包括一种光拾取装置，它包括一个光电检测器，该光电检测器检测从盘的信息轨道反射的激光束以及放大电路，其放大光电检测器的输出。 光电检测器和放大器电路整体组合。 还提供用于位置调整的前置放大器电路。 放大器中包括开关，用于交替地禁止光电检测器到放大器电路的输出的路径，以允许用前置放大器进行位置调整，并使得光电检测器的输出路径能够被放大器电路正常工作。

    Method for manufacturing an optical fiber preform
    2.
    发明授权
    Method for manufacturing an optical fiber preform 失效
    光纤预制棒的制造方法

    公开(公告)号：US4224046A

    公开(公告)日：1980-09-23

    申请号：US932968

    申请日：1978-08-11

    申请人： Tatsuo Izawa ,  Toru Kuwabara ,  Yuichi Masuda ,  Yuji Kameo

    发明人： Tatsuo Izawa ,  Toru Kuwabara ,  Yuichi Masuda ,  Yuji Kameo

    IPC分类号： C03B37/018 ,  C03B37/014 ,  G02B6/00 ,  G02B6/028 ,  C03B19/06 ,  C03B37/075

    CPC分类号： G02B6/0281 ,  C03B37/01413 ,  C03B37/0142 ,  C03B2201/10 ,  C03B2201/28 ,  C03B2201/31 ,  C03B2203/26 ,  C03B2207/06 ,  C03B2207/20 ,  C03B2207/22 ,  C03B2207/28 ,  C03B2207/81 ,  C03B2207/86 ,  C03B2207/87 ,  Y10S65/16

    摘要： Two gaseous raw glass materials containing dopants to provide different refractive indices and borne by an argon carrier are jetted from the central or inner and first concentric nozzles 11, 12 of a five tip burner 1; an argon shield is supplied through the second concentric nozzle 13, and hydrogen and oxygen are supplied through the third and fourth concentric nozzles 14, 15, respectively. Soot-like glass particles 4 are formed by flame hydrolysis and deposited on the lower end of a start rod 3 which is gradually rotated and withdrawn to thus grow a cylindrical preform 2. The intermixing of the particles formed from the two glass materials produces a preform having a substantially parabolic radial index of refraction distribution, which characteristic is retained in an optical communication fiber formed by sintering and drawing the preform.

    摘要翻译： 包含掺杂剂以提供不同折射率并由氩载体承载的两种气态原料玻璃材料从五个尖端燃烧器1的中心或内部和第一同心喷嘴11,12喷射; 氩屏蔽通过第二同心喷嘴13供应，氢和氧分别通过第三和第四同心喷嘴14,15供应。 烟灰状玻璃颗粒4通过火焰水解形成，并沉积在起始杆3的下端，起始杆3逐渐旋转和抽出，从而生长圆柱形预制件2.由两个玻璃材料形成的颗粒的混合产生预制件 具有基本上抛物线的径向折射率分布，其特征保留在通过烧结和拉伸预成型体而形成的光通信纤维中。