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Ultra-Low Power Rotary Encoder

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The incremental rotary encoder used in the CV-5/8 enables operations at power levels considerably lower than those of ordinary optical-type encoders. A pulse pattern is created with the conductive plastics resistive element, and the brush is swept over this pattern to obtain a rotational pulse. This thus enables operations at low currents of 10 uA or less.

Principle

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As shown in the above diagram, a brush connected with the rotation axis sweeps over the conductive plastic resistive element, and a pulse is thereby emitted. Both the A and B phase patterns are pulled up by the resistance, and the common pattern and the output only when contact is made with the brush becomes L. The pattern phase lags by 90��, thereby enabling detection also of the rotational direction.

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