Encoder Discs
Material
Substrate material |
selected float glass, BK7 optical glass, ceramics, aluminium oxide and others. |
Thickness of substrate | 0,5 - 8 mm |
Coating - 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 |
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Pattern
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 |
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GLASS PLATES
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.</