| 摘要 |
PURPOSE:To reduce not only the heat generating quantity but the supply electric power, by dividing a number of key switches into several blocks and supplying the electric power only to the switch group whose key is pressed. CONSTITUTION:A number of key switches are divided into several blocks. The position of the pressed key switch is detected by a BCD counter 17 and a decoder 18. Control is given so that the electric power is supplied only to the switch group whose key is pressed. |
