| 摘要 |
A flash bulb unit comprising a plate-shaped support on which an electric circuit is provided. The circuit includes a plurality of combustion flash bulbs. On the side of the support remote from the bulbs the unit has an opaque plate. The plate and the support are each provided with holes aligned with at least one flash bulb. A foil is disposed intermediate the plate and support which substantially blocks light rays until the bulb is flashed whereupon the heat melts the foil. The hole in the support increases in diameter from the side on which the bulb is disposed to the opposite side and is narrower on the side of the bulb than the hole in the plate. The part of the support situated adjacent to the hole in the plate has a color contrasting with that of the foil.
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