| 摘要 |
PROBLEM TO BE SOLVED: To provide a keyboard device which can prevent a password from being known by a 3rd person even if input operation for the password is viewed. SOLUTION: By this output signal cutting-off method of the keyboard device, a switch 13 does not operate unless any force is applied to a pressure sensor 12 and input signals from respective keys of a keyboard circuit 11 are outputted to the main body device through a connector 2. When a force is applied to the pressure sensor 12, the switch 3 operates and the input signals from the respective keys of the keyboard circuit 11 are stopped from being outputted to the main body device.
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