| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain an input device which is inexpensive, excellent in durability and use convenience by suppressing oscillation of an oscillation means and judging input. SOLUTION: A ultrasonic wave sensor touch switch normally vibrates a sensor 1 of a ultrasonic wave oscillator, vibration of the sensor 1 is stopped by touching this switch and judgement of input is made. In this case, an output voltage of a circuit changes by a strength of touching the switch and it is possible to detect whether the switch is touched (i.e., the switch is pressed with a light pressure) or it is pressed separately. It is constituted so that input of three steps, a state in which the switch is not pressed (or touched), a state in which the switch is slightly touched and a state in which the switch is pressed, is enabled by using an output voltage which changes in accordance with a pressure in this way. Thus, since the sensitivity is excellent, it is possible to perform input with a light (weak) force.</p> |
