The features of optical rotary encoder！

This type of encoder outputs a pulse string in response to the amount of rotational displacement of the shaft. A separate counter counts the number of output pulses to determine the amount of rotation based on the count.
To detect the amount of rotation from a certain input shaft position, the count in the counter is reset at the reference position and the number of pulses from that position is added cumulatively by the counter. For this reason, the reference position can be selected as desired, and the count for the amount of rotation can be unlimited.
Another important feature is that a circuit can be added to generate twice or four times the number of pulses for one signal period, for heightened electrical resolution.
Also, the phase-Z signal, which is generated once a revolution, can be used as the origin within a revolution.

 When high resolution is necessary, a 4-multiplier circuit is generally used.
(4x output is obtained by differentiating the rise and fall waveforms of phase A and phase B, resulting in four times the resolution.)

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