| 摘要 |
PURPOSE:To permit certain and automatic return of a turn signal flasher by counting the traveling distance of a car after the trun signal flasher is opereated. CONSTITUTION:The right and left turning switches 1 and 2 for turn signal flasher close contacts only during the time when the switches are pressed, and said contacts are opened when the switches are released. When the switch 1 is pressed, the transformation to the signal which is kept at high level only during one cycle of an oscillator 9 from the moment when the contact in a one-shot circuit 3 is closed is performd, and a lamp 16 is turned ON by a latch circuit 5 set by the high level output of the one-shot circuit 3 and the output of an AND gate 14 into which the output of a frequency divider 10 is supplied. When a counter 8 which counts the signals which are formed by detecting the revolution of a wheel by a photointerrupter counts a certain velue, the output of the counter 8 is set to a high level, and the latch circuit 5 is reset through an OR gate 11, and the lamp 16 is turned OFF. |
