| 摘要 |
Miniature electrical switching apparatus including a thin disk-shaped switching unit (10), positionable within a light bulb socket, and a thin film flexible electrical conductor (14) having one end attached to the switching unit (10), the conductor being extendable through the gap between the electrically conductive inner wall of the socket and the electrically conductive outer surface of the bulb base disposed in the socket, and terminating at its distal end in a detector (12) for sensing light or other properties and generating a small electrical current for controlling actuation of the switching unit. The switching unit has a first contact (18) on one side for engagement with the socket center terminal, and a second contact (32) on an opposing side for engagement with the center terminal of a light bulb or other electrical load. The unit includes a thin circuit board (15) having control circuitry (26) mounted thereon. The control circuitry (26) receives operating power from the electrical load through the first contact and is responsive to the current communicated through the flexible conductor (14) to turn the power to the second contact ON and OFF. The circuitry also has provision for gradually applying power to the bulb (slow start) to extend bulb life, and has a hysteresis response to the incoming sensor signal so as to eliminate turn-ON and turn-OFF cycling. |
