| 摘要 |
A hand-hold rotation gravity driving optical encoder includes an optical encoder disk rotatably mounted in an encoder support rack which is fixed on a handle. The optical encoder disk has a non-symmetric gravity, and has an outer periphery provided with a counterweight that is not symmetric relative to a rotation center thereof. A fixing shaft is extended through the optical encoder disk and the encoder support rack, thereby mounting the optical encoder disk on the encoder support rack. The encoder support rack is provided with at least one infrared emitting and receiving photoelectric unit. The handle has a central line that may be in parallel with, vertical to or inclined with a normal line of the optical encoder disk.
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