Scale/Disk: Diameter 10-300 mm, Thickness 0.5-5 mm

Q: What is the difference between incremental and absolute encoder disks?

Incremental disks have uniform periodic patterns that generate pulses for relative position measurement. Absolute disks have unique coded patterns (Gray code, binary) that provide unique position values for each angular position without requiring a reference point.

Q: How does disk material affect encoder performance?

Glass disks offer superior thermal stability and precision for high-accuracy applications. Polymer disks provide better shock resistance and cost-effectiveness. Material choice affects thermal expansion, durability, and optical/magnetic properties.

Component Specifications

Definition

A precision-engineered rotating disk component within encoder systems that contains precisely patterned markings (optical lines, magnetic poles, or capacitive patterns) which interact with sensors to generate electrical signals corresponding to angular position, rotational speed, or linear displacement. The disk's pattern resolution directly determines the encoder's measurement accuracy and resolution.

Working Principle

The disk rotates with the measured shaft, and its patterned surface interacts with stationary sensors (optical, magnetic, or capacitive). As patterns pass the sensor, they create periodic signal variations that are converted to digital pulses. The pulse count determines position, while pulse frequency determines speed. Optical disks use light transmission/reflection through precise gratings; magnetic disks use alternating pole patterns; capacitive disks use varying dielectric patterns.

Materials

Optical disks: glass (borosilicate) or polymer (polycarbonate, acrylic) with chromium or photoresist patterning. Magnetic disks: ferromagnetic alloys (nickel-iron) with magnetized patterns. High-end: ceramic composites for thermal stability. Coatings: anti-reflective (optical), protective (parylene).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Accuracy	±1 arc-second to ±5 arc-minutes
Diameter	10-300 mm
Thickness	0.5-5 mm
Line Count	100-50,000 lines/revolution
Maximum RPM	5000-20000 RPM
Pattern Type	Incremental/Absolute (Gray code, binary)
Operating Temperature	-40°C to +120°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, DIN 43855, IEC 60068

Parent Products

This component is used in the following industrial products

Encoder System

A precision measurement device that converts angular or linear position into digital signals for position feedback in CMM arms.

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Engineering Analysis

Risks & Mitigation

Pattern contamination/damage
Thermal expansion mismatch
Mounting misalignment
Material degradation under UV/chemical exposure
Electrostatic discharge damage (optical disks)

FMEA Triads

Trigger: Contamination on optical patterns
Failure: Signal dropout or erroneous readings
Mitigation: Sealed encoder housings, regular cleaning protocols, contamination-resistant coatings

Trigger: Thermal expansion mismatch between disk and shaft
Failure: Pattern distortion and accuracy loss
Mitigation: Material matching, temperature compensation algorithms, low-CTE materials

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Pattern position tolerance: ±0.5 μm to ±5 μm, Flatness: <5 μm, Runout: <10 μm

Test Method

Laser interferometry for pattern accuracy, coordinate measuring machines (CMM) for dimensional verification, optical inspection for pattern defects, thermal cycling tests

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

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Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Scale/Disk

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Frequently Asked Questions

What is the difference between incremental and absolute encoder disks?