| 摘要 |
<p>This steering wheel switching circuit comprises… (a) a switching part (1), in which three circuits are connected in parallel across two terminals, one circuit being a switch contact circuit (SW1), another circuit being a series circuit including a diode (D2) and another switch contact circuit (SW2), and other circuit being another series circuit including a diode (D3) connected in a reverse direction as compared with said diode (D2) and other switch contact circuit (SW3), and… (b) a controlling part (2), in which two sets of series circuit including switching elements, having control terminals, and load resistances, connected to each earthing side of power supplies, are connected in parallel with said power supplies (E); two control output terminals (A, B) are connected across two sets of connecting point, each of which connect one of said switching elements and one of said load resistances: control signals are applied as they are to the control terminal of switching element of one of said two sets of series circuit; and said control signals are applied by inverting them to the control terminal of switching element of the other of said two sets of series circuit; whereby the said switching part (1) is fixed on a suitable position of a steering wheel, and two terminals (1a, 1b) of said switching part are connected through coupling parts to the control output terminals (A, B) of said controlling part (2) which are fixed on a car body side, so that a plurality of component parts to be controlled which are installed on a car body side can be controlled by outputs of said control output terminals with the combination of switching-on-and-off of switches in each switch contact circuit of said switching circuit with variations of high and low levels of said control signals.</p> |
