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43 条记录 (耗时 0.014 秒)

    Electronic lighting control responsive to ambient light
    1.
    发明授权
    Electronic lighting control responsive to ambient light 失效
    电子照明控制响应环境光

    公开(公告)号：US3735141A

    公开(公告)日：1973-05-22

    申请号：US3735141D

    申请日：1971-09-01

    申请人： SIGMA INSTRUMENTS INC

    发明人： BELING T

    IPC分类号： H05B37/02 ,  H01J39/12

    CPC分类号： H05B37/0218 ,  Y02B20/46

    摘要： In the disclosed control, a light source is turned on and off bistably in response to ambient light. To do this, a photoresistor or photocell, whose resistance increases with decreasing light, is exposed to the ambient light. The photoresistor or cell forms part of a voltage-energized voltage divider, and is connected across a neon lamp from which the cell is shielded. When the ambient light is sufficiently dim the lamp is lit. The current through the neon lamp is intensified with a second photoresistor or photocell in series with the lamp and subject to decreasing resistance as the lamp brightens. This constitutes a positive feedback and holds the neon lamp on. A third photoresistor or photocell in series with a switch responds to the bright lamp to turn on the switch and hence the light source. When the ambient light reduces beyond a given threshold the first photocell turns off the lamp and the second photocell increases its resistance enough to hold off the lamp.

    摘要翻译： 在所公开的控制中，响应于环境光，光源被双向打开和关闭。 为了做到这一点，光敏电阻或光电池的电阻随着光线的减小而增加，暴露在环境光下。 光敏电阻或电池形成电压分压器的一部分，并连接在电池屏蔽的氖灯上。 当环境光线足够昏暗时，指示灯亮起。 通过氖灯的电流随着与灯串联的第二光敏电阻或光电池而增强，随着灯变亮，电流降低。 这是一个积极的反馈，并持有霓虹灯。 与开关串联的第三光敏电阻或光电管响应亮灯来打开开关，从而打开光源。 当环境光降低到给定阈值以上时，第一光电池关闭灯并且第二光电池增加其电阻足以阻挡灯。

    Indicating meter with visual alarm
    2.
    发明授权
    Indicating meter with visual alarm 失效
    用视觉报警表示

    公开(公告)号：US3715661A

    公开(公告)日：1973-02-06

    申请号：US3715661D

    申请日：1969-03-24

    申请人： SIGMA INSTRUMENTS INC

    发明人： POSEY A ,  QUICK H

    IPC分类号： G01R11/02 ,  G01R15/08 ,  G01R19/14

    CPC分类号： G01R11/02

    摘要： An indicating meter with an indicating member movable over a scale provides a visual alarm when the indicating member enters a selected range of the scale. One or more light sources are provided in the meter, and the indicating member member carries one or a pair of arcuate masks, symmetrically on either side of the indicating member, and spaced by a predetermined angular or arcuate distance. The single mask or each of the pair of masks blocks light from a respective source from illuminating the scale unless the indicating member is in a respective selected range of the scale. Mask means are mounted on the meter casing, and are adjustable as to length, and these mask means cooperate with the mask or masks carried by the indicating member. The scale is translucent or transparent, and the illumination of the selected range of the scale, when the indicating member moves into such range, provides a visual alarm. If desired the visual alarm may be a colored illumination. In a modification, a photocell arranged in a suitable electronic circuit with one or more transistors is arranged to effect the illumination of a lamp when the indicating mark enters a selected range or one of two or more selected ranges of the scale.

    Constant current power supply
    8.
    发明授权
    Constant current power supply 失效
    恒流电源

    公开(公告)号：US3767998A

    公开(公告)日：1973-10-23

    申请号：US3767998D

    申请日：1972-03-03

    申请人： SIGMA INSTRUMENTS INC

    发明人： BELING T

    IPC分类号： H02M7/162 ,  H02M7/20

    CPC分类号： H02M7/1623

    摘要： In the power supply disclosed, a bridge rectifier receives alternating current and forms a unidirectional voltage across a filter capacitor. A thyristor in each of two adjacent arms of the bridge controls the voltage produced. A suitable amplifier biases a control potential sensed by a current sensing resistor and applies it to one side of a comparator. A sweep circuit forms a periodic waveform that remains substantially zero for one half of each period and rises during the second half of the period in a path that corresponds to the last quarter of a sine wave cycle. The comparator triggers the thyristors each time the sweep waveform exceeds the biased control potential. Each sweep period is formed during a half cycle of the input voltage, so that two sweeps occur for each cycle of input voltage.

    摘要翻译： 在所公开的电源中，桥式整流器接收交流电并在滤波电容器两端形成单向电压。 桥的两个相邻臂中的每个中的晶闸管控制所产生的电压。 合适的放大器偏置由电流感测电阻器感测的控制电位并将其施加到比较器的一侧。 扫描电路形成周期性波形，其在每个周期的一半上保持基本为零，并且在对应于正弦波周期的最后四分之一的路径的周期的后半段期间上升。 每次扫描波形超过偏置控制电位时，比较器触发晶闸管。 每个扫描周期在输入电压的半周期内形成，从而在输入电压的每个周期发生两次扫描。

    Nonpolarized magnetic reed switch
    9.
    发明授权
    Nonpolarized magnetic reed switch 失效
    非绝缘磁开关

    公开(公告)号：US3559123A

    公开(公告)日：1971-01-26

    申请号：US3559123D

    申请日：1968-12-09

    申请人： SIGMA INSTRUMENTS INC

    发明人： SAKATOS MICHAEL J

    IPC分类号： H01H51/28 ,  H01H51/06

    CPC分类号： H01H51/287

    摘要： A NONPOLARIZED, SINGLE POLE, DOUBLE THROW DRY REED SWITCH CONSISTING OF AN ELONGATED ENVELOPE WHICH CARRIES THREE REED MEMBERS, TERMINATING, RESPECTIVELY, IN FIRST, SECOND AND THIRD CONTACT ELEMENTS THAT ARE POSITIONED WHOLLY WITHIN THE ENVELOPE. THE FIRST CONTACT ELEMENT IS RESILIENT AND FLEXIBLE AND PROJECTS INWARDLY FROM ONE END OF THE ENVELOPE. THE SECOND AND THIRD CONTACT ELEMENTS ARE ESSENTIALLY RIGID, PROJECT INWARDLY FROM THE OTHER END OF THE ENVELOPE AND ARE SPACED APART. THE FREE END PORTION OF THE FIRST CONTACT ELEMENT IS POSITIONED IN THE SPACE BETWEEN THE SECOND AND THIRD CONTACT ELEMENTS AND NORMALLY AND YIELDINGLY MAKES CONTACT WITH THE SECOND CONTACT ELEMENT. ALL REED MEMBERS, INCLUDING THEIR CONTACT ELEMENTS, ARE HOMOGENEOUSLY FERROMAGNETIC. BY PROPER SELECTION OF PARAMETERS OR COMBINATIONS OF PARAMETERS, SUCH AS THE COMPOSITION AND EXTENT OF ANNEALING OF THE REED MEMBERS AND THE CONFIGURATION AND ARRANGEMENT OF THE CONTACT ELEMENTS, THE PRESENT REED SWITCH EMBODIES IMPROVED OPERATING CHARACTERISTICS, SUCH AS EFFECTIVE SNAP ACTION, AS COMPARED TO CONVENTIONAL SWITCHES OF THE SAME GENERAL TYPE.