| 摘要 |
PROBLEM TO BE SOLVED: To provide a speed sensor for detecting the speed of a baseball or the like by connecting a sensor main body to a game machine. SOLUTION: An amplifier 10 is connected to a reference oscillator 9 and a first ultrasonic vibrator 11 is connected. A second ultrasonic vibrator 12 is connected to a band-pass filter 13 and output is amplified in the amplifier 14 and inputted to one of the terminals of a mixer 15. The reference oscillator 9 is connected to the other terminal and the output of the mixer 15 is connected to a low-pass filter 16 and connected to the amplifier 17. The output terminal of the amplifier 17 is connected to the input terminal of a frequency counter 18, the frequency counter 18 is connected to an output buffer 19, a memory 20 with built-in software signals for operating the game machine 22 is provided and the sensor main body 21 is constituted. By inserting an insole terminal provided on the lower part of the sensor main body 21 to the insertion part of the game machine 22 and pressing a button 25 toward a moving object, the game machine is utilized as this speed sensor. |
