| 摘要 |
PURPOSE:To prevent chattering and delay by allowing a transistor (TR) supplying a power to a TR turned on by an input to turn on after a prescribed time elapsed after application of power. CONSTITUTION:The 2nd TR3 is turned off until a prescribed time elapses after application of power by a timer circuit 9 in which the 3rd TR5 is operated by application of power and malfunction is prevented by avoiding the supply of power to the 1st TR1. After a prescribed time, the 2nd TR3 is turned on so as to supply power to the 1st TR1. Thus, the presence of approaching object is detected, a comparator 3 gives an output and when the 1st TR1 is turned on, the 2nd TR3 is turned on already, no delay in response and chattering occurs so as to turn on the 1st TR1. |
