| 摘要 |
<p>A compact computer pointing device without moving parts which detects the movement of objects including operator's hand by means of various waves. In an ultrasound embodiment it consists of two ultrasound transmitter-receivers mounted at an appropriate position on the computer housing or keyboard which can sense the direction and velocity of moving objects in front of them using the Doppler effect. In an optical embodiment it consists of two optical transmitter-receivers (11/21; 14/27) mounted at an appropriate position on the computer housing or keyboard which can sense the direction and velocity of moving objects in front of them using light waves and the cross correlation calculations. The movement can be exerted by the operator moving the palm of his hand in front of these transceivers in the desired direction and at the desired speed. The thus detected movement is measured and utilized as velocity vectors for generation of the signals for the screen cursor movement. The system is particularly suited for compact computers where space sparing is important.</p> |
