| 摘要 |
PURPOSE: To improve safety in replacement of a lamp by arranging a switch interrupting voltage from a voltage supply circuit in a lamp replacing time. CONSTITUTION: When a lens 90 is removed from an ordinary position covering an opening of a reflector for replacing a lamp, a plate spring 320 responds so as to move a curved part 331 and a lower arm 326 to the position in which no stress is applied. In this way, disconnecting switches 304, 306 are opened, excitation circuits 300, 302 are cut off from contact structures 50, 52, and this condition is maintained until the lens 90 is set in the ordinary position covering the opening part of the reflector. In this way, even if a lamp is inserted into a circuit to which voltage is supplied, the lamp is not lighted, so that the lamp can be replaced safely. |
