| 摘要 |
A hand-controlled mechanism is described for producing signals to move the position of a cursor in a computer display. The mechanism includes a shaft (12) on which a cylindrical member (10) is mounted, the member being both rotatable with the shaft and slidable along its axis. The cylindrical member is provided with at least two sets of encoding markings (16,18), such markings being orthogonally related to each other. The first set of reflective markings (16) reflect radiant energy of all but a first band of wavelengths while the second set of encoding markings (18) is reflective of radiant energy of all but a second band of wavelengths. Optical emitters/sensors (22,24,20,34) are provided which are responsive to the movement of the encoding markings (16,18) to sense both rotational and axial movement of the cylindrical member (10) and to provide outputs indicative thereof. The optical emitter/sensor (20,34) which sense rotational motion are responsive to reflected radiant energy of the first band of wavelengths and the optical emitter/sensor (22,24) which sense axial movement are responsive to reflected energy of the second band of wavelengths. |
