The working principle of optical disc.！

A four-phase sine wave signal is combined into A, B, C, D, and each sine wave is composed of a center-axis optical encoder disk, on which there are circular through and dark scribe lines, and photoelectric transmitting and receiving devices are read. A phase difference of 90 ° (360 ° with respect to a cycle), the C, D signal reverse, superimposed on the A, B two-phase, can enhance the stability of the signal.

As A, B two-phase difference of 90 °, can be compared by A phase in front or B phase in order to determine the encoder forward and reverse. Encoder 360 degrees per rotation to provide the number of dark lines called resolution, also known as analytical indexing, or directly call the number of lines, that is, a turn of the number of pulses issued.

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