| 摘要 |
<p>The arrangement is for a signalling unit used to give an alert sign by a combination of coloured lights. It comprises a light box (3) containing a number of partitioned (11) chambers (10,16) whose illumination (e.g. light bulbs 5) is visible through an opening (1) in a front cover (2). At least part of the box facing the cover has the partitions (11) formed as a thin-walled metal structure and covered by a thermoplastic material containing 20-40 vol.% TiO2. This structure may be formed by a pressure decasting in zinc. It may be integral with a base plate (4) acting as heat sink.</p> |
