Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Load device irradiating the radiant energy responsive device
Patent
1977-02-17
1978-04-04
Smith, Alfred E.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Load device irradiating the radiant energy responsive device
315241P, H05B 4130, H05B 4136
Patent
active
040829820
ABSTRACT:
An automatic electronic flash device including: a flash discharge tube, a first switching element connected in series with the flash discharge tube, a main discharge capacitor adapted to supply its charged energy to the flash discharge tube for firing thereof so that an object to be photographed is illuminated, a light receiving circuit which receives light reflected from the object for turning on a second switching element when the amount of the received light reaches a predetermined value, a commutation capacitor which is made to discharge in response to the second switching element being turned on and supplies a reverse current through the first switching element whereby the first switching element is turned off so as automatically to stop illuminating, a trigger circuit for supplying a high voltage pulse to the trigger electrode of the flash discharge tube, and a high voltage supply circuit which generates a high voltage in synchronism with the operation of the trigger circuit so that the generated voltage is superposed on the charging voltage of the main discharge capacitor for being applied across the main electrodes of the flash discharge tube.
REFERENCES:
patent: RE28025 (1974-05-01), Murata et al.
patent: 3626246 (1971-12-01), Higuchi
patent: 3809951 (1974-05-01), Vital et al.
Roberts Charles F.
Smith Alfred E.
West Electric Company Ltd.
LandOfFree
Automatic electronic flash device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automatic electronic flash device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic electronic flash device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-725457