| 摘要 |
A zoom lens decode control includes a circuit board, the circuit board having a first annular contact circuit, a second annular contact circuit and an annular counting circuit concentrically arranged around an axle hole thereof, the annular counting circuit having radially extended protruding counting tips, and an electric brush adapted to be rotated with a gear and moved over the circuit board, the electric brush having three protruded contacts adapted to contact the first annular contact circuit, the second annular contact circuit and the counting tips of the counting circuit for causing a microprocessor to control the angle and direction of rotation of a zoom lens control motor subject to the amount and direction of the rotary motion of the gear.
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