| 摘要 |
<p>The present invention provides an input apparatus capable of being reduced in thickness and in which the occurrence of contact failure is prevented. A coplanar line 5 is formed on the surface of a substrate 6 so as to pass through the vicinity of a position at which a user performs an operation. A terminating resistor 4 is placed at one end of the coplanar line 5 and a microcomputer module 3 at the other end. The microcomputer module 3 has a signal transmitter 16 for outputting a signal to the coplanar line 5. When the user operates a key, the impedance of the coplanar line 5 changes and a reflected wave is produced. A signal detector 18 detects the reflected wave and outputs received-signal strength information, which indicates the strength of the signal included in the reflected wave, to a computing unit 19. Based upon the received-signal strength information and strength of the signal that has been output by the signal transmitter 16, the computing unit 19 discriminates the key that has been operated and specifies the entered instruction.</p> |
