Absolute encoder disc！

An absolute rotary encoder features a code disc attached to the shaft and a fixed mask that allows the tached to the shaft and a fixed mask that allows the fier for each point of travel (linear versions operate analogously, but for the sake of simplicity, we’ll focus on rotary versions here). As the code disc rotates atop the fixed mask, the system periodically reads out the 
identifier, outputting it as a multi-bit digital word. 
The associated controller or drive polls the encoder to 
capture position data that it can use directly or process 
into velocity information.

In the case of an optical encoder, the fixed mask 
features alternating transparent and opaque regions. 
Similarly, the code disc is patterned with transparent 
and opaque regions to define a set of rings (tracks) and 
periodic radial zones on those tracks (see figure 3); 
each track is read out by a different LED/photosen

sor pair. The code disc sits atop the fixed mask, which 
typically sits atop a sensing ASIC that contains the 
detector array and associated electronics. As the code 
disc turns, its transparent regions periodically overlay 
the transparent regions on the fixed mask, allowing the

optical signal to pass through to the detector to 

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