| 摘要 |
A light-detector assembly is provided for use with light-actuated, selectively operable, electronic triggering equipment for triggering a wide variety of different kinds of events, particularly performance, entertainment, advertising or information events. Said assembly comprises light-detecting means (19; 53; 80); means for locating said light-detecting means off-axis in relation to a collimated source of visible light (L; 40), light deflecting means (18; 52; 78); and positioning means (14: 46; 74) for positioning said light-detecting means on the optical axis of said collimated source; wherein said deflecting means are adapted to deflect towards said light detecting means, light, such as retro-reflected light, that is directed towards the source. Said deflecting means may comprise a mirror (19, 53, 76) adapted to reflect said light to the light detector, and in some embodiments the deflecting means (78) may comprise a plurality of mirrors (76) and a corresponding plurality of light-detectors (80) may be provided that are spaced around the beam, wherein each of the light-detectors is collimated with a respective one of the mirrors.
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