Optical Reflective Encoders

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Seiko NPC SMD series encoder modules combined with VC America’s high precision scales and interpolation circuits achieve word 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

  • High Precision Glass Scales from VC America

    • VC America soda lime scales complement SMD series encoders

    • Multiple reflective coating options to further increase performance and lower encoder power consumption

    • Up to 150mm diameter or 160mm length

    • Custom sizing and coating options to meet any special requirements

  • 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


  • "SMD



    Block Diagram
    "SMD
    A-B Analog low distortion output (Lissajous curve)
    "SMD












    SMD-01A (pdf)SMD04 (pdf)
    Track Period20µm20µm
    Resolution<5 nanometer to 350 picometer using 10-14 bit A/D interpolation
    OutputAnalog A and B✅ Analog A and B and Digital Z (index)
    A B Output Gain1, 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)0.300.50
    Operating Temperature range-20°C to 60°C✅-30°C to 85°C
    SeriesDescriptionVC America
    Recommendations
    StatusDatasheets
    SMD-01Optical reflective encoder 20 µ period Analog AB outputsActivePDFSMD-01.pdf
    SMD-04Optical reflective encoder 20µ period Analog AB plus Z (index) digital output✅ Best of Class ❗Active
    SMD-01AOptical reflective encoder 20µ period Analog AB outputsActivePDFSMD-01A.pdf
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