| 摘要 |
<p>A target (1) comprises an array of electro-optical devices (3) such as light-emitting diodes, disposed within light impervious tubes (4). When a ray of light impinges on one of the devices (3) it is detected. Control circuitry (6) then causes the device to emit visible light so as to indicate the point of impact. The target can be for use in optical shooting or can be used as an optical drawing board (8) in conjunction with a light pen (9).</p> |
