| 摘要 |
<p>The switching system is used for a normal and auxiliary source of an operating threatre lighting fitting. The changeover from normal to auxiliary light is carried out automatically. No dark period occurs on changeover which can occur on manual changeover switching. An energisation relay (12) is connected in series with each normal light source (10). A relay has contactor (12r) for auxiliary light source (10a) connected in series with normal light source. Both series circuits are connected parallel to each other to the electric power supply (1, 2). A current or voltage operated semiconductor element is used as relay. A signal lamp (16) is connected in parallel to the auxiliary light source.</p> |
