| 摘要 |
1,170,664. Flash-bulbs. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. March 30, 1967 [April 2, 1966], No.14493/67. Heading G2L. A flash-bulb comprises three current supply conductors, two of which form part of the ignition system of the bulb and the third of which is mechanically connected within the bulb to one of the first two by means of an electrically insulating paste containing a silver compound which decomposes when the bulb is fired to form an electrically conductive connection. A plurality of bulbs may be combined to form a photo-flash magazine, the firing of one bulb creating a current bridge through the third conductor to enable the next successive bulb to be fired. The paste contains a silver compound such as silver oxalate, lactate, citrate, nitrate, carbonate or chlorate, together with a binder, e.g. nitro-cellulose, a solvent, and a flux such as a metal fluoride, phosphate or borate. A coloured or black substance, e.g. silver powder or graphite powder, which is a good conductor of electricity may be added to indicate the presence of the paste. |
