Electric flash lamp unit with a light controlling circuit

Details Electric flash lamp unit with a light controlling circuit Electric flash lamp unit with a light controlling circuit

1981-02-18

1983-08-09

La Roche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

315241P, 354 23D, 354 33, 354127, 354145, H05B 4132

Patent

active

043981275

ABSTRACT:
An electric flash lamp unit is provided with an electric flash lamp and a storage capacitor for supplying energy to the flash lamp unit. An optimum exposure value of a film is previously determined. Therefore, a flash time of the flash lamp for providing the optimum exposure is determined by providing a distance from a flash lamp to an object to be photographed, a film sensitivity, an F number, and a charge voltage of the storage capacitor. A number of flash time data with the associated addresses are stored in a ROM. The distance information modified by the film sensitivity and the F number and the charge voltage information of the storage capacitor are used as address data for the ROM. The flash time data is read out from the ROM by the address data and is used to deenergize the electric flash lamp.

REFERENCES:
patent: 4258991 (1981-03-01), Kuraishi
patent: 4262997 (1981-04-01), Yuasa

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