working principle of Roundss rotary encoder！

In principle, such as the encoder signal points, incremental encoders, absolute encoders. Incremental encoder (rotary)
working principle:
It consists of a center axis of the optical encoder, which has a ring through the dark of the engraved lines, optoelectronic transmitting and receiving device to read, get a sine wave signals into four groups A, B, C, D, each sine wave phase difference of 90 degrees (with respect to a cycle of 360 degrees), the C, D inverse signal
Superimposed on the A, B two-phase, can enhance signal stability; the other output per revolution Z-phase pulse to represent a zero reference position.
Since the A, B two-phase difference of 90 degrees, the first phase A or B by comparing the first phase, in order to determine the encoder forward and reverse, the zero pulse can be obtained encoder zero reference position.
Encoder code disc material glass, metal, plastic, glass code discs are deposited thin engraved lines on the glass, good thermal stability, high accuracy, metal code disc directly through the barrier and engraved lines, non-friable, However, since the metal has a certain thickness, there are restrictions precision, thermal stability is necessary an order of magnitude worse than glass, plastic code disc is a economical, low cost, but the accuracy, thermal stability and life are to be worse .
Resolution - 360 degrees per encoder rotation through or how much dark groove called the resolution, also known as analytic indexing, or direct say how much wire, usually 5 degrees per rpm to 10,000 lines.

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