| 摘要 |
PURPOSE:To constitute a turn-off delay circuit which makes light-touch switching on/off possible with simple and inexpensive construction by employing a soft-touch switch, a specified digital IC, and a specified CR time constant circuit. CONSTITUTION:A digital IC 4 turns the levels of an output voltage to high or low level by turns at every operation of a soft-touch switch 3. The digital IC is turned to the high level with a load drive switch 5 to light a lighting device 2. A CR time constant circuit 6 comprising a resistance R and a condenser C is connected, together with the load drive switch 5 and via a normal direction diode D, to the digital IC 4. By turning the soft-touch switch off 3 during the lighting of the lamp, the lamp is turned off after a time specified with the CR time constant circuit 6. The turn-off delay function is reset by turning on a changeover switch 7 connected in parallel to the diode D. |
