Method of manufacting an SMD resistor
    123.
    发明授权
    Method of manufacting an SMD resistor 失效
    制造SMD电阻的方法

    公开(公告)号:US5683566A

    公开(公告)日:1997-11-04

    申请号:US649133

    申请日:1996-05-14

    Inventor: Ullrich Hetzler

    Abstract: A resistor of SMD (Surface Mounted Device) construction includes a film of a resistive alloy as a resistive track on two electrically separated carrier plate elements of copper, which are constructed as contact elements solderable to the terminals of a printed circuit board to thereby ensure good heat dissipation into a printed circuit board. In order to manufacture such resistors, a resistive film sufficient for a plurality of individual resistors is adhered to but electrically isolated from a large copper plate and the laminate formed thereby is split into the individual resistors after producing the individual resistive tracks and their electrical connections to the copper plate and after producing gaps between the plate elements for each track.

    Abstract translation: SMD(表面安装器件)结构的电阻器包括作为电阻轨道的两个电隔离的铜载体元件的电阻合金膜,其被构造为可焊接到印刷电路板的端子的接触元件,从而确保良好 散热成印刷电路板。 为了制造这种电阻器,可以将足够多个单独电阻器的电阻膜粘附到大铜板上而与之电隔离,并且由此形成的层叠体在产生各个电阻轨道及其与 并且在每个轨道的板元件之间产生间隙之后。

    Circuit for regulating current in a PBX loop
    125.
    发明授权
    Circuit for regulating current in a PBX loop 失效
    用于调节PBX回路中的电流的电路

    公开(公告)号:US5054060A

    公开(公告)日:1991-10-01

    申请号:US463792

    申请日:1990-01-16

    Abstract: A fiber optic to electrical conversion unit includes front and rear modular design with rear card modules conditioning signals to be passed to front modules. A frame synchronization method transmits a stream of multiplexing frames and periodically inserts a synchronization word in the stream. Prediction of the next synchronizing word in the receiving unit reduces the need to search for a synchronization word in the stream. Loop current regulation in a two-wire loop between a central office and a PBX uses a transformer serially connected in the two-wire circuit with a regulation circuit which holds the current in the loop within a predetermined range to permit the transformer to be held to a relatively small size. High frequency noise bypassing is accomplished by forming capacitor loops from the power connection to the ground connection of the component near to the component.

    Abstract translation: 光纤到电气转换单元包括前后模块化设计,后置卡模块调理要传递到前模块的信号。 帧同步方法发送多路复用帧流,并在流中周期性地插入一个同步字。 接收单元中下一个同步字的预测减少了在流中搜索同步字的需要。 在中心局和集团电话之间的双线回路中的回路电流调节使用在双线电路中串联连接的变压器与调节电路,该调节电路将回路中的电流保持在预定范围内,以允许变压器保持 相对较小的尺寸。 通过从电源连接到组件附近的组件的接地连接形成电容器回路来实现高频噪声旁路。

    High frequency noise bypassing
    126.
    发明授权
    High frequency noise bypassing 失效
    高频噪音旁路

    公开(公告)号:US5027089A

    公开(公告)日:1991-06-25

    申请号:US247350

    申请日:1988-09-21

    Applicant: Reinhold Henke

    Inventor: Reinhold Henke

    Abstract: Apparatus and method for bypassing high frequency noise from a component mounted to a circuit board provides that the component be connected to the power and signal ground planes of the PC board with respective signal traces and that bypass capacitors be connected between these signal traces between the component and the signal and ground planes.

    Abstract translation: 用于从安装到电路板的部件旁路高频噪声的装置和方法提供了组件通过相应的信号迹线连接到PC板的功率和信号接地层,并且旁路电容器连接在组件 和信号和地面。

    Board wiring pattern for a high density memory module
    127.
    发明授权
    Board wiring pattern for a high density memory module 失效
    高密度存储器模块的板接线图案

    公开(公告)号:US5012389A

    公开(公告)日:1991-04-30

    申请号:US284238

    申请日:1988-12-14

    Inventor: Richard A. Perry

    Abstract: A high density memory module in which memory chips are mounted in an array of rows and columns on a printed circuit board. The circuit board includes groups of serpentine parallel conductors which extend along adjacent columns for connecting corresponding power, ground, control, address and data pins between the adjacent columns to one another. Adjacent groups of serpentine parallel conductors are nested within one another. According to the invention, high density packaging is provided for large chip arrays, using a minimum number to vias to interior board layers, and minimum interchip spacing.

    Abstract translation: 一种高密度存储器模块,其中存储器芯片以印刷电路板上的行和列阵列的形式安装。 电路板包括一组蛇形平行导体,它们沿相邻的列延伸,用于将相邻列之间的相应电源,接地,控制,地址和数据引脚相互连接。 相邻的蛇形平行导体组彼此嵌套。 根据本发明,对于大型芯片阵列,使用最小数量的通向内部板层的通孔和最小的芯片间距来提供高密度封装。

Patent Agency Ranking