INDUSTRY COMPONENT

Code Disc

A precision optical disc with encoded patterns used in high-resolution encoders to convert angular position into digital signals.

Component Specifications

Definition
A code disc is a critical optical component in rotary encoders, featuring precisely etched or printed patterns (such as incremental lines or absolute codes) on a transparent or reflective substrate. It works in conjunction with a light source and photodetector array to generate electrical pulses corresponding to rotational displacement, enabling accurate position, speed, and direction measurement in industrial automation systems.
Working Principle
The code disc rotates with a shaft, interrupting or modulating light from an LED or laser source. Photodetectors read the pattern transitions, converting them into quadrature signals (A, B, and sometimes Z for index/reference). Incremental discs produce periodic pulses per revolution, while absolute discs have unique codes for each angular position, providing immediate position data without homing.
Materials
Typically made from glass (e.g., borosilicate) for high precision and thermal stability, or polymers (e.g., polycarbonate) for cost-effective applications. Coatings may include chromium for opaque patterns or anti-reflective layers. Alternative materials: quartz for extreme environments, metal for rugged applications.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Max RPM10,000 RPM
Accuracy±5 arcseconds to ±30 arcminutes
Diameter10mm to 100mm
ResolutionUp to 65,536 counts per revolution (16-bit)
Pattern TypeIncremental, absolute (Gray code, binary)
Operating Temperature-40°C to +85°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 16063-1, DIN 32712

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Pattern degradation due to wear or contamination
  • Misalignment causing signal errors
  • Thermal expansion affecting accuracy
  • Mechanical damage from shock/vibration
FMEA Triads
Trigger: Contamination (dust, oil) on disc surface
Failure: Signal dropout or erroneous readings
Mitigation: Use sealed encoder housings, regular cleaning protocols, and contamination-resistant coatings.
Trigger: Bearing wear or shaft misalignment
Failure: Eccentric rotation causing inconsistent pulse generation
Mitigation: Implement precision bearings, alignment checks during installation, and runout tolerance monitoring.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Pattern placement accuracy within ±1 micron, radial runout < 10 microns
Test Method
Optical comparator inspection, laser interferometry for angular accuracy, environmental cycling tests per IEC 60068-2

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Code Disc

Manufacturer profiles associated with Code Disc.

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Frequently Asked Questions

What is the difference between incremental and absolute code discs?

Incremental discs have evenly spaced lines generating pulses for relative position tracking, requiring a reference point. Absolute discs have unique patterns for each position, providing immediate absolute angle data without homing.

How do environmental factors affect code disc performance?

Temperature changes cause thermal expansion/contraction, potentially altering pattern accuracy. Contamination (dust, oil) can obscure optical readings. Vibration may induce signal noise. Proper sealing, material selection (e.g., low-CTE glass), and mounting mitigate these issues.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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