| 摘要 |
A double-grid mechanical encoder is provided which includes a wheel mounted around a shaft, a metal spring unit adapted to provide power supply to the wheel and to produce different voltages to an external circuit, enabling it to detect the revolving direction and amount of movement of the wheel. The wheel has two metal cores disposed on opposite sides and electrically connected together. Two annular grids are respectively disposed on opposite sides around the metal core and offset from each other by a predetermined angle. Each of the annular grids has a plurality of electrical conducting portions coupled to the metal core and a plurality of insulative portions radially and alternatively arranged around the corresponding metal core. The metal spring unit includes a first metal spring leaf and a second metal spring leaf of equal size respectively disposed in contact with the two annular grids of the wheel and caused to produce different voltage signals upon the rotary motion of the wheel. A third metal spring leaf is disposed in continuous contact with one metal core of the wheel to provide power thereto. |
