Optical Reflective Encoders

Seiko NPC SMD series encoder modules combined with VC America’s high precision scales and interpolation circuits achieve world class performance in a miniature footprint.

Exceptional Encoder Performance with Seiko NPC SMD series Resolution to <1 nanometer (with interpolation) Accuracy to ±1 arc-second Low noise, Low distortion, high resolution output 20µm native track period Unique receptor increases tolerance to scale misalignment and contamination Reduce manufacturing time and labor costs Increased yields, long term reliability, and life time performance Lower service and maintenance cost Proven reliability and long lifetime with built-in LED Miniature Footprint for total solution 5.3 x 4.3 mm encoder footprint and package height to 1.5mm Total solution package heights less than 3.8mm

Block Diagram

A-B Analog low distortion output (Lissajous curve)

	SMD-01A SMD-01A.pdf	SMD04 SMD-04.pdf
Track Period	20µm	20µm
Resolution	<5 nanometer to 350 picometer using 10-14 bit A/D interpolation
Output	Analog A and B	✅ Analog A and B and Digital Z (index)
A B Output Gain	1, 1.8, 2.6 X setting (LED Brightness)	1, 1.8X, AGC (LED Brightness) Index use AGC (Automatic Gain control)
Dimensions L W H (mm)	5.3 x 4.3 x 1.68	✅5.3 x 4.3 x 1.50
Gap (mm)	0.30	0.50
Operating Temperature range	-20°C to 60°C	✅-30°C to 85°C

Series	Description	VC America Recommendations	Status	Datasheets
SMD-01	Optical reflective encoder 20 µ period Analog AB outputs		Limited Suply to Inventory	SMD-01.pdf
SMD-04	Optical reflective encoder 20µ period Analog AB plus Z (index) digital output	✅ Best of Class ❗	Active	SMD-04.pdf
SMD-01A	Optical reflective encoder 20µ period Analog AB outputs	✅	Active	SMD-01A.pdf