| 摘要 |
The case of a track ball structure has X-axis and Y-axis encoder shafts provided therein and X-axis and Y-axis driven rollers rotatably coupled with said shafts and provided closer to the top panel of the case than said shafts. A ball makes rotary contact with the X-axis and Y-axis driven rollers and is held to partly protrude from an opening made in the top panel of the case.
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