| 摘要 |
A device for controlling the position of a cursor on a computer screen comprises a case with a finger controllable element 3, at least one circular optic piece and a reading set for generating binary signals and for reading data concerning movement of the finger controllable element. At least one register is provided for recording the length values of the binary signals generated by the optic grid pieces. The device has a single operating mode for detecting movement of the finger controllable element using at least two sets of different ratio constants to multiply the distance moved by the finger controllable element according to a variation in speed of movement of said element thereby controlling the distance of movement of a cursor on a display screen to be positively proportional to the respective rotational distance of the finger controllable element.
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