| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a track ball system without wiring to an external power supply and the central part of a computer or the like. SOLUTION: The track ball system has a track ball 1, a power supply for powering the electronic circuit in the system, and a communication means for sending signals depending on the rotation of the track ball to the central part of a computer or the like. The track ball 1 is optically transparent, the power supply is a solar battery 2 and the communication means is a radio communication means 8.</p> |
