| 摘要 |
A roller for an input device extends through a slot in a top housing and is supported by a cantilevered arm. The roller is attached at the end of the arm and rotates about a shaft mounted on the cantilevered arm. The cantilevered arm is attached proximate the rear of the top housing, and thus is free to flex when the roller is depressed. As a result, when pressure is applied to the roller, the roller depresses through the slot in the top housing independently from the buttons on the top housing. The cantilevered arm has a spring force to bias the roller upward, eliminating the need for a return spring (lift spring).
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