| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cable connection detecting device capable of detecting and informing wrong insertion of flexible flat cables. <P>SOLUTION: A flat cable (FFC) 203a is connected to connectors 205 and 206 of a printed-circuit board 201 and a printed-circuit board 202, respectively. Connection detecting output signal of an output port 307 is transmitted to a terminal B1 of the connector 206 via FFC 203a from a terminal A15 of the connector 205. As a terminal B1 and a terminal B12 of the connector 206 are connected through a signal line in the printed-circuit board 202, after the connection detecting output signal is transmitted to a terminal A4 of the connector 205 via a terminal B12 of the connector 206 and FFC 203a to input into an input port 308, a control circuit 204 compares the output level of an output port 307 with the input level of the input port 307 to judge whether it connects by the right FFC. Signal for connection detecting is arranged in asymmetrical locations of the cable to detect matching between the input and output levels. <P>COPYRIGHT: (C)2009,JPO&INPIT |
