| 摘要 |
The present invention relates to a touch pad and, more specifically, to a touch pad, based on piezoelectric effect, that employs a piezo film, is fabricated thin on, but not limited to, metal, exactly and stably recognizes various touch patterns a user executes such as long key, multi key, slide key, etc. and significantly improves the level of security. To achieve the objectives, the present invention provides a touch pad using the piezo effect comprising: a touch pad equipped with touch keys; a piezo film that attaches to the bottom surface of the touch pad and radiates ultrasonic waves; and a control section that recognizes touches a user executes by analyzing the electric displacement of the piezo film and ultrasonic impedance reflected by the touch pad surface and a touch object that contacts to the surface. |
