| 摘要 |
PROBLEM TO BE SOLVED: To provide an impact detecting device acquiring the degree of an impact while saving on power by keeping down the amount of data and the frequency of data processing, the device having a simple circuit configuration dispensing with any A/D converter. SOLUTION: This impact detecting device 1 is equipped with: an acceleration sensor element 11, a capacitor 20 for step integration, an operational amplifier 18, a recording circuit 6, and an FET 22 for electric charge resetting. The sensor element 11 outputs an impact detection value that changes depending on the degree of impact. Electric charge corresponding to the detection value is stored in the capacitor 20. The quantity of electric charge stored in the capacitor 20 having reached a stipulated value cause an output of the operational amplifier 18 to change. A real time clock is recorded in the recording circuit 6 when the output of the operational amplifier 18 is changed. The quantity of electric charge stored in the capacitor 20 is reset by the FET 22 when the output of the operational amplifier 18 is changed. COPYRIGHT: (C)2011,JPO&INPIT |
