| 摘要 |
A housing 1 made of a synthetic resin is placed on a printed circuit board 8 on which a control circuit, a static electricity releasing pattern 10 and so on are formed, and a retainer 7 is mounted on the upper end of the housing 1 to prevent detachment of a ball 3. A conductive ring 15 is fixed to the rear surface of the retainer 7, and a conductive connection pin 16 is fixed to the housing 1 to connect the conductive ring 15 to the static electricity releasing pattern 10. When the static electricity charged on the operator is discharged to the ball 3, it enters the coordinate input device from a gap between the ball 3 and an open portion of the retainer 7, and then is grounded through the conductive ring 15 provided on the rear surface of the retainer 7, the connection pin 16 connected to the conductive ring 15 and then the static electricity releasing pattern 10 on the printed circuit board.
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