| 摘要 |
A trackerball arrangement consists of a solid rotatable ball mounted within a housing and supported by a pair of orthogonal rollers 4, 5, which run in bearings. Rotation of the ball causes corresponding rotation of optical encoders attached to the rollers so that electrical signals are generated representative of the x and y rotation of the ball. The supports and bearings are prone to damage from vertical shocks received via the ball. To limit shock damage an additional resilient support allows the ball to move away from the bearings and absorb the shock. This resilient support consists of a rotatable wheel 10 on a pin 11 supported on a pair of guide rails 12. A pair of leaf springs 13 urges the wheel 10 against the trackerball. <IMAGE>
|
