| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily switch a lamp bulb for lighting a name strip, by providing a mechanism for automatically switching a blown-out bulb to a spare one when the blown-out bulb is detected in a main lamp SOLUTION: When the bulb of a main lamp LP1 is blown out, the nonelectrified condition of a main bulb path SC1 is detected by a detecting element Q1 to actuate a spare lamp balb control element Q2 . When the control element Q3 is controlled by the action of the control element Q2 , a spare lamp bulb electrification element Q4 electrifizes a spare lamp bulb LP2 via a spare lamp bulb path SC2 . This can automatically switch the main lamp bulb LP1 , lighting name strips NP1 -NP10 to the spare lamp bulb LP2 , by power source terminals CN1 and CN2 .</p> |
