| 摘要 |
PROBLEM TO BE SOLVED: To prevent an error of a counting value from increasing even when electric power supply to a pulse counter is interrupted by power interruption or the like, in a pulse counter for counting pulse signals of a reed switch. SOLUTION: This counter is provided with the first transistor 21 of which a base current is controlled by switching of a reed switch 7 to conduct ON-OFF operation, a holding capacitor 29 for carrying out charge and discharge by the ON-OFF operation of the first transistor 21, the second transistor 22 for interlocking with the ON-operation of the transistor 21 to be ON-operated and to be brought into an OFF-condition, after a temporal ON-condition, by a discharge current of the capacitor 29, and the third transistor 23 for conducting inverting operation with respect to the first transistor 21. When the ON-operation of the second transistor 22 by the discharge current of the capacitor 29 is overlapped with the ON-operation of the third transistor 23, a counter 8 is operated to conduct counting. |
