OPtical encoder disk！

The rotary encoder disk contains the lines which interrupt the beam.  Again, ideally, the encoder manufacturer wants the lines to be as sharp as possible, to produce clear transitions from dark-to-light and light-to-dark on the encoder sensor.  Encoder manufacturers have used glass encoder disks for years in machine tool encoders.  The lines can be placed with great accuracy on the glass disk.  However, glass encoder disks have serious durability issues in rugged applications like oil drilling.  So manufacturers of optical rotary encoders for industrial applications have switched to metal disks with holes etched through, or plastic disks, or super-reinforced glass.

 Each of these rotary encoder disk types have limitations.  The super-reinforced glass encoder disk still is glass, and can fail under the heavy shock and vibration of drilling or other tough applications.  Plastic encoder disks flex under vibration, causing potential errors in velocity or position measurement.  The metal encoder disks can also flex, and the tiny encoder disk holes can become clogged with dust or debris.

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