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    • 14. 发明专利
    • REVOLUTION NUMBER INDICATOR FOR MODEL
    • JPH0857163A
    • 1996-03-05
    • JP19675694
    • 1994-08-22
    • USHIO YASUO
    • USHIO YASUO
    • A63H27/00A63H27/24A63H27/30
    • PURPOSE: To realize an accurate digital indication, by providing a revolution speed sensor on the output shaft of a rotary driving machine mounted on a model plane or the like and counting the output signals of the revolutional speed sensor for a specified time interval from a specified high-frequency signal generated out of a crystal oscillator and displaying the digital indication. CONSTITUTION: A specified high-frequency signal outputted from a crystal oscillator 15 during the engine driving of a model plane or the like is divided by a frequency divider 16 to input them in a counter controller 10 which counters the number of wave-form with about 0.6 times of a specified frequency outputted from the frequency divider 16. During the counting, the number of the pulse signals generated from the revolution speed sensor 11 is measured by a counter 12. The output pulse number of the revolution speed sensor 11 is displayed in digital on a liquid crystal indicator 13. Accordingly, the revolution number per 0.6sec. is shown in digital in the liquid crystal indicator 13 and the revolution number per one min. is obtained by multiplying the above figure by too.