Rotary

Maximize performance of any optical encoder with precision glass scales by VC America. Rotary and Linear scales 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.

Scale Series	Type	Pitch/Period Accuracy		Maximum Dimension(mm)		Description	Mounting
Scale Series	Type	Local	Total	Maximum Dimension(mm)		Description	Mounting
Precision Rotary Scales	G	±1µm	±2µm	150	Diameter	Reflective chrome on clear glass	Epoxy and UV adhesive
	A					Reflective chrome with bottom side absorptive layer	Epoxy
	E					Enhanced Reflective chrome with bottom side absorptive layer	Epoxy
	C					Reflective chrome with bottom side absorptive layer and clear center zone	Epoxy and UV adhesive

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

Material characteristics (Linear and Rotary)
Material	Soda-lime glass
Temperature Coefficient (TCE)	8.5x10^-6
Chrome Layers	Min	Max	Units
Reflective	50	60	%
Enhanced Reflective	88		%
Absorptive (anti-reflective)		5	%

Rotary Scale Dimensional Tolerances
Symbol	Specification	Tolerance	Units
OD	Core Outside Diameter	±0.1	mm
ID	Core Inside Diameter	±0.1	mm
T	Thickness	±0.05	mm
TTV	Total Thickness Variation	10	µm
LTV	Local Thickness Variation	5	µm
Metal Pattern alignment to axis		±20	µm

Datasheets

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