Device for indicating light and photoflash circuit conditions in

Details Device for indicating light and photoflash circuit conditions in Device for indicating light and photoflash circuit conditions in

1977-05-19

1979-05-01

Gellner, Michael

354 60L, G03B 708, G03B 1505

Patent

active

041520556

ABSTRACT:
A device for visually indicating the camera incident light conditions and the readiness of an associated photoflash network on a single element includes an incandescent indicating lamp connected through parallel transistors to a current source. One transistor is controlled in response to the light incident on a photoconductor to apply a steady current to the lamp when the photoconductor incident light is below a predetermined level. The other transistor is controlled by a relax action oscillator including the photoflash triggering capacitor to apply an intermittent current at a visually perceptable frequency to the lamp when the charge on the photoflash main capacitor is at least at a predetermined value. The lamp is advantageously located as to be visible through the camera view finder.

REFERENCES:
patent: 3688664 (1972-09-01), Mashimo

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