| 摘要 |
1,182,195. Flash-bulbs. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. Feb. 28, 1967 [March 2, 1966], No.9346/67. Heading G2L. A flash-bulb which may be arranged in a common unit with one or more other flash bulbs and comprising an envelope 13 containing actinically reacting material 14, e.g. zirconium wool, is fitted with two pole wires 16, 17 connected by a filament 15 coated with ignition paste, and an additional electrode 18, the arrangement being such that the pole wire 16 becomes connected to the electrode 18 as a result of the combustion reaction which occurs on ignition of the bulb. Thus when a plurality of bulbs is mounted in a suitable unit whereby they are connected together electrically as shown, ignition of one bulb places the next successive bulb in circuit for firing. The connection may be made in various ways. In bulb 9a, a drop 20 of low-melting-point metal, e.g. Wood's metal, carried by the wire 16a, is melted by the heat of the flash and bridges the wires 16a and 18a, in bulb 9b a non-conductive mass 22 connects the wires 16b, 18b and is rendered conducting by the heat or light of the flash; and in bulb 9c, a thin metal tube 24 connected to the wire 16c and surrounding but spaced from the wire 18c is compressed by the gas pressure occurring during the flash and makes contact with the electrode 18c. The power source 12 for igniting the bulbs may be a dry battery or a Piezo-electric crystal. Reference has been directed by the Comptroller to Specification 1,103,682. |
