Optical Reflective Encoders

Achieve world class encoder performance with Seiko NPC SMD series combined with VC America's precision scales.

Encoder Performance
- 1270 LPI (Lines per Inch) / 50 Lines per mm and 20µm track period width
- Quadrature output is 5080LPI / 200 Lines per mm.
- Excellent Lissajous curve and low cyclical errors increase interpolation accuracy
- Proven reliability and long lifetime
- 1.0mm height and 0.5mm GAP fit within most encoder products
- Upgrade encoder accuracies with new PCB and scale
Precision Linear and Rotary Glass Scales
- Up to 700mm Linear, Up to 150mm Rotary diameter
- Soda lime glass standard, special glass available
- Multiple coating process options available

Key Features

High resolution 20 µm track period
Excellent Lissajous curve lower cyclical errors and improve interpolation accuracy
low distortion, low noise AB outputs
Small footprint and 1.0 package height fit within existing hardware

Typical Applications

20µm Resolution and Interpolation
Encoding	Imperial		Metric
Encoding	LPI (lines per inch)	Resolution	LPM (lines per mm)	Resolution
×1	1270 LPI	0.787 mils	50 LPM	20µm
Quadrature A-B ×4	5080 LPI	0.197 mils	200 LPM	5µm
With external ADC 12-bit Interpolation	20,807,680 LPI	0.0000481 mils	819,200 LPM	0.0012207µm

Series	Description	VC America Recommendations	Status	Datasheets
SMD-04B	20µ period 3-Channel Optical Reflective Incremental Encoder with two Analog A/B outputs and Z (index) digital output	✅ for incremental encoder index and non-index applications	New Product	SMD-04B.pdf
SMD-01B	20µ period 2-Channel Optical Reflective Incremental Encoder with A/B Analog outputs	✅ for incremental encoder non-index applications	Active	SMD-01B.pdf
SM3414B	100µ period Optical Reflective Absolute Encoder with up to 51.2mm track length (2⁹) plus analog output for high resolution using interpolation	✅ Linear absolute encoder up to 51.2mm in length	Active	SM3414B.pdf SM3414BL-G PCB land pattern.pdf SM3414BL-G Reliability Test.pdf SM3414BL-G tray.pdf
Linear Scales	Precision Linear scales	✅ Linear Scales up to 700mm in length	Active	Linear Glass Scales.pdf
Rotary Scales	Precision Glass Rotary scales (Codewheels)	✅ Rotary series up to 700mm in diameter	Active	Rotary Glass Scales.pdf