Light measuring unit for an electronic flash device

Details Light measuring unit for an electronic flash device Light measuring unit for an electronic flash device

1978-08-16

1980-06-17

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

315159, 315241P, 354 33, H05B 4132

Patent

active

042086175

ABSTRACT:
A light detecting and measuring device for use with an electronic flash unit comprises a phototransistor, integrating capacitor and diodes connected in circuit to the flash unit. The diodes and capacitor are connected to the phototransistor and responsive to signals from the flash unit for enabling measurement of light by the phototransistor only while the flash unit is operating thus preventing measurement from external light sources.

REFERENCES:
patent: 3714443 (1973-01-01), Ogawa

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