To provide a movement support keyboard sheet which, while promoting a user's finger movements through an input operation on a keyboard, does not hinder the user's input operation if a load applied to fingers is not necessary, as when the input operation is required at high speed.
When a pressure frequency calculation means 63a determines according to a signal output from a pressure detection unit 54 that the frequency of pressure on a key switch 72 is not more than a certain level, a hardness control means 63b outputs an instruction to a voltage control unit 65 to apply a voltage to an electrode 55 for voltage application. When the voltage is applied to the electrode 55 for voltage application, the hardness of an electrorheological fluid sealed inside the keyboard sheet 50 increases, promoting the user's finger movements. If the pressure frequency calculation means 63a determines that the frequency of pressure is more than the certain level, the hardness control means 63b outputs an instruction to the voltage control unit 65 to cancel the voltage applied to the electrode 55 for voltage application.
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Fumio Yamamoto
Yukine Sekine