Encoder Discs


Substrate material

selected float glass, BK7 optical glass, ceramics, aluminium oxide and others.
Low CTE: quartz glass, borosilicate, Robax, Zerodur.

Thickness of substrate 0,5 - 8 mm


 - optical density

 - reflection

 - layer thickness

vacuum deposited chrome

1.5 - 3 (±5%) at 400-900 nm

< 60% at 400-900 nm

200÷4000 Å

Disc processing

Laser cutting, grinding

Outbreaks on edges < 0.1 mm
Grinded, polished glass edges linearity 0.015 mm/m





Coating Aluminum, silica, chrome, anti-reflective chrome and others on request
Mark period ratio deviation ±2.5%
Max. graduation accuracy 2 arc. sec
Graduation coaxiality to outside diameter < 0.1 mm
Grating pitch from 8 μm





Glass plates are available in a variety of pattern configurations for variety of applications

Overall dimensions up to 8" (203,2 mm)
Minimum size of element 5 μm
Pattern size up to 180x180 mm

Variations to suit customer requirements

Other glass types, glass thicknesses and shapes of graduations lines can be provided.</


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Download Glass Discs Specifications Datasheet