Rotary Scales

Rotary Scales
Precision Glass Rotary scales (Codewheels)

Maximize performance of any optical encoder with precision glass scales by VC America. Linear and Rotaryscales are manufactured using soda-lime glass with chrome reflective and absorptive layers optimized for 630-640nm (Red LED), with dimensional precision and low defect density.

Standard scales provide opportunity for fast evaluation and support production and we manufacture to customer specifications for unique patterns and dimensional requirements.

Track periods of 20µm, 40µm, 100µm are common. We'll manufacture scales to 2µm period (1µm reflective +1µm clear or anti-reflective) when needed.

CodePrecision RotaryMounting
CGReflective chrome on clear glassEpoxy, UV
ARReflective chrome topside with Anti-reflective layer bottom sideEpoxy
ACReflective chrome and Anti-reflective layer top side (in track area) and clear center zoneEpoxy, UV

Rotary scales OD and ID are sawed and edges may be straight cut or beveled with chamfer or rounded edges.

OD MaximumSoda-Lime GlassUp to 700±0.1mm
ODOutside Diameter±0.1mm
IDInside Diameter±0.1mm
TTVTotal Thickness Variation10µm
LTVLocal Thickness Variation5µm
CTETemperature coefficient of expansion8.510-6mm/mm°C
Pitch/Period AccuracyLocal±1µm
Metal pattern alignment to Axis±20µm
Chrome reflective layerStandard505460%
Chrome absorptive(anti-reflective)@ 630nmAR<25%
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