| 摘要 |
PURPOSE:To prevent deterioration in the reliability of a key board even in the state of adverse environment, and in addition, to improve an operability by providing a simple key board with a key switch part and a changeover switch, and using a full key board alternatively. CONSTITUTION:The simple key board 1 consists of a key switch part 4, a CPU interface 5 and a changeover switch 6, and the switch part 4 is constituted of a numeral key and a function key. A signal pushed by the switch part 4, is inputted to the interface 5, and after being decoded, is inputted to a CPU 3 through the switch 6. Besides, by changing over the switch 6, key information outputted from the full key board 2 is inputted to the CPU 3 through a terminal 7, the switch 6 and a connection cable 8 to the CPU. In such constitution, a dust-proof and drip-proof seat key whose use frequency is a little can be used, and it does not harm the reliability even at the place of the adverse environment. Besides, at the time of the changing a program or generating a trouble, the operationability can be improved because the key board 2 is available by changing over the switch.
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