Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Load device irradiating the radiant energy responsive device
Patent
1976-03-15
1977-10-04
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Load device irradiating the radiant energy responsive device
315134, 315136, 315159, 315241P, H05B 4132, G01J 116
Patent
active
040526445
ABSTRACT:
An electronic flash unit having the conventional flash tube, storage capacitor dischargeable through the flash tube, measuring device for recording the quantity of light emitted by the flash tube and reflected back from the subject being photographed, a pulse generator responsive to the measured reflected light, and means for quenching the flash in response to a pulse produced when the measured reflected light reaches a threshold value. The present flash unit, in addition to the conventional features just mentioned, includes the novel feature of a light-emitting diode which becomes illuminated when the light measuring means and the pulse generator circuit become operative, thus signalling to the user of the device that the so-called "computer" mechanism has actually operated. Circuit means is provided for extinguishing the light-emitting diode at the proper time. By incorporating such a light-emitting diode in the flash unit, the operator is informed of the operativeness of the computer in a more satisfactory way than is possible with prior art devices which notify the operator, the present invention being particularly useful in informing the operator of the functioning of the computer mechanism during each flash in a rapid succession of flashes, not possible in the customary prior art constructions.
REFERENCES:
patent: 3706911 (1972-12-01), Wilwerding
patent: 3979639 (1976-09-01), Adams, Jr.
patent: 3983448 (1976-09-01), Nakanishi
LaRoche Eugene R.
Rollei-Werke Franke & Heidecke
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