| 摘要 |
The invention is to provide a rotary-type encoder structure utilized by a device to control movement and scrolling on the screen of a display, which has a resilient projecting member unitarily formed on a footing such that the resilient projecting member is postured against and between arcuate sections contiguously disposed along the inner wall of a recess in one side of a roller wheel; such that, when the user rotates the roller wheel, the coordinative relationship between the said arcuate sections and the said projecting member enables all intervals of engagement are identical during each revolution of the roller wheel to achieve the objective of page turning or movement on the screen.
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