Electronic flasher

Details Electronic flasher Electronic flasher

1979-07-16

1981-09-29

Gellner, Michael L.

354145, G03B 1505

Patent

active

042919630

ABSTRACT:
An improved electronic flasher for a camera having automatic power cut-off means for automatically cutting the power input to the charging circuit thereof when the device is ready to flash is provided with means for producing a flash sufficiently luminescent for picture taking for a finite period of time after power input thereto has been cut-off. The improved flasher includes a two-way switching means, an electromagnet and a charge indicating means, for instance, a glow lamp, which provides the operator with a positive indication when the device is suitably charged to provide a satisfactory flash. The switching means and electromagnet cooperate to form a relay for controlling current feed to a flasher circuit high-voltage capacitor as a function of the condition of charge thereof, the electromagnet being concomitantly controlled by the charge indicating means as a corresponding function of the voltage present thereon. The electromagnet is electrically connected downstream of the charge indicating means and energization thereof is controlled thereby. The charge indicating means is connected to a voltage divider having a first arm comprising a fixed resistor and second arm comprising a variable resistor, the variable resistor having different resistances during and after the charging of the device. The resistance of the second arm of the voltage divider may be varied, for instance, by providing switching means for bridging a portion of the resistor. Suitable switching means which may be employed to effect the bridging function include, for example, a transistor which may perform either a blocking or conductive function in relation to the position of the two-way switching means.

REFERENCES:
patent: 4016575 (1977-04-01), Uchiyama et al.
patent: 4084167 (1978-04-01), Iwata
patent: 4135797 (1979-01-01), Ohmura et al.

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