| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a switch state specification device having a structure in which a switch contact which is exclusively turned on among plural switch contacts forming a switch, is specified using a ladder resistance circuit, capable of burning off a contact coat generated on the switch contact with a simple structure.SOLUTION: A contact coat burning-off circuit 5 and respective switch contacts 2a-2f are connected in common via diodes 6a-6f, for supplying current which is larger than normal current capable of burning off a contact coat generated on the switch contacts 2a-2f from the contact coat burning-off circuit 5 in common. Therefore, the contact coat burning-off circuit 5 do not have to be installed on each of the switch contacts 2a-2f, requiring only a single contact coat burning-off circuit 5.</p> |
