| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a housing opening/closing detection circuit whose manufacturing cost is low and whose possibility of being a failure is small and which has high reliability and to provide a detecting method using it. SOLUTION: A contact 6 is jointed to a roof cover 1 by a screw 7 and connected to the ground, a signal from a pull-up resistance 2 is led to the ground through a 2nd signal line 4 and the contact 6, and it is detected that the cover 1 is closed when no signal is inputted to an IC 5. Meanwhile, it is detected that the cover 1 is open by such a manner that the connection of the contact 6 and the cover 1 is released and that the signal from the resistance 2 is inputted to the IC 5 through a 1st signal line 3.</p> |
