| 摘要 |
Present invention provides an ultrasonic input device for information display. The ultrasonic input device includes a stylus 140, an ultrasonic receiving unit 130. The stylus further includes a piezoelectric disk element 210 that vibrates toward a circular opening 225 of a housing 220. A reflective structure 240 supported by a base 250 reflects the vertical plane wave 310 to become 360 degree horizontal plane wave 320. There are pillars 230 for interconnecting a supportive base 250 and the housing 220.
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