Sequencing circuit for firing photoflash lamps in predetermined order专利检索-结漏电流电子零件及设备专利检索查询-专利查询网

Sequencing circuit for firing photoflash lamps in predetermined order

阅读：891发布：2023-10-19

专利汇可以提供Sequencing circuit for firing photoflash lamps in predetermined order专利检索，专利查询，专利分析的服务。并且A plurality of resistors are successively connected between the junctions of a plurality of series-connected photoflash lamps and semiconductor switch devices of a sequential flashing circuit. The resistors function to provide leakage current paths for the semiconductor switch devices to insure the flashing of the lamps in a desired predetermined order even though one or more of the lamp circuits may be open-circuited.，下面是Sequencing circuit for firing photoflash lamps in predetermined order专利的具体信息内容。

权利要求

1. A sequencing circuit for sequentially flashing a plurality of photoflash lamps which normally become open-circuited upon flashing, said circuit comprising a plurality of semiconductor switch devices respectively adapted to be connected in series with the lamp circuits of said plurality of flash lamps, and sequencing circuitry stages successively connected between said semiconductor switch devices, said switch devices having the characteristic of drawing leakage current when said circuit is sequencing, said leakage current for each said switch device being drawn through its series-connected lamp if the lamp is unflashed and has a relatively low resistance and being drawn through the succeeding sequencing stage if its series-connected lamp has a relatively high resistance, wherein the improvement comprises a plurality of resistors successively connected between said switch devices so as to be successively connected between the junctions of the series-connected circuits of the switch devices and lamp circuits when the lamp circuits are connected to said sequencing circuit, said resistors having resistance values to provide said leakage current to any of said switch devices having in series therewith a defectively high resistance lamp, thereby assuring that the lamps will flash in a predetermined order.

2. A circuit as claimed in claim 1, in which each of said resistors has a resistance value of approximately 300 ohms.

3. A circuit as claimed in claim 1, in which said semiconductor switch devices comprise SCR''s (silicon controlled rectifiers) having anode and cathode current electrodes respectively connected in said series-connected circuits.

4. A circuit as claimed in claim 3, in which each of said sequencing circuitry stages comprises a transistor, means connecting the base electrode of each transistor to the series-circuit junction of the preceding stage, and means connecting the collector and emitter electrodes of said transistors in current paths between a circuit point of voltage and the gate electrode of the next succeeding SCR.

5. A circuit as claimed in claim 4, in which each of said resistors has a resistance value of approximately 300 ohms.

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Sequencing circuit for firing photoflash lamps in predetermined order

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