| 摘要 |
PURPOSE:To efficiently perform key input, by changing the key input speed through the depressing force of a key switch. CONSTITUTION:A key 1 is provided with a pressure-electric force converting element. In increasing the depressing force of the key 1, a voltage at a point 2 is increased as shown in Figure, and when the voltage exceeds a reference voltage Ea of a comparator 4, a signal (b) is outputted from the comparator 4 and inputted to an AND gate 7. A signal which is outputted from a voltage controlled oscillator 3 changed with the oscillating frequency in response to the voltage rise at the point 2 and frequency-divided at a counter 5, is inputted to the gate 7. A strobe pulse C is outputted from the AND gate 7 in a slow period while the depressing force of the key 1 is weak and in a faster period while the force is stronger. This period can arbitarily be set through the selection of the output rate to the input voltage of the oscillator 3. |
