| 摘要 |
<p>An optical distress signal transmitter has a number of light emitting diodes (14) on a dome-shaped diode socket (18) whose surface (19) is coated with a retroreflective material, the light emitting diodes (14) projecting from this surface and being so arranged that at least two of them are visible when the distress signal transmitter is viewed from the side or from a higher elevation with respect to the base plane of the socket holding the light emitting diodes.</p> |
