INDUSTRY COMPONENT

Light Source/LED (for optical encoders)

High-precision LED light source for optical encoder position sensing systems

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Component Specifications

Definition
A specialized LED component engineered to emit consistent, collimated infrared or visible light for optical encoder systems. It provides the illumination source that interacts with encoder discs or scales to generate position feedback signals through photodetectors. These LEDs are optimized for minimal thermal drift, long-term intensity stability, and precise wavelength characteristics required for accurate displacement measurement.
Working Principle
Operates by converting electrical current into photons through semiconductor electroluminescence. When forward-biased, electrons recombine with holes in the active region, emitting light at specific wavelengths (typically 850-950nm infrared or 650-670nm red). This light passes through or reflects off encoder patterns, creating modulated signals detected by photodiodes or phototransistors to determine position, speed, or direction.
Materials
AlGaAs/GaAs semiconductor chips for infrared (850-950nm), InGaAlP for red (650-670nm), ceramic or metal-ceramic substrates, gold wire bonding, silicone or epoxy encapsulation with precise optical windows, Kovar or copper alloy leads
Technical Parameters
  • Package 3mm/5mm radial, surface mount (SMD)
  • Lifetime >50,000 hours
  • Wavelength 850nm ±10nm (typical)
  • Optical Power 1-5mW
  • Viewing Angle 15-30° (collimated)
  • Rise/Fall Time <100ns
  • Forward Voltage 1.8-2.2V @ 20mA
  • Operating Temperature -40°C to +85°C
Standards
ISO 16063-21, IEC 60747-5-5, JEDEC JESD22

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Light Source/LED (for optical encoders).

optical encoder LED encoder light source position sensor LED infrared LED encoder motion control lighting industrial photoelectric component Light Source/LED (for optical encoders) Light Source/LED (for optical encoders) in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Encoder/Feedback Device

A device that converts mechanical motion into electrical signals to provide position, speed, or direction feedback in motion control systems.

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Engineering Analysis

Risks & Mitigation
  • Thermal drift affecting accuracy
  • Intensity degradation over time
  • Wavelength shift with temperature
  • Contamination of optical surfaces
  • ESD damage during handling
FMEA Triads
Trigger: Thermal expansion mismatches in packaging
Failure: Wavelength drift and intensity variation
Mitigation: Use matched CTE materials, thermal management design, temperature compensation circuits
Trigger: Semiconductor aging and defect migration
Failure: Gradual light output degradation
Mitigation: Burn-in testing, derated operation, quality semiconductor processes
Trigger: Moisture ingress or chemical contamination
Failure: Optical surface fogging or corrosion
Mitigation: Hermetic sealing, conformal coatings, clean manufacturing environments

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Wavelength tolerance ±5nm, intensity variation <10% over temperature range, angular alignment ±2°
Test Method
Spectroradiometry for wavelength/spectral distribution, integrating sphere for total flux, L-I-V characterization, accelerated life testing per IESNA LM-80

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

Why are infrared LEDs commonly used in optical encoders?

Infrared LEDs (850-950nm) minimize interference from ambient visible light, provide better signal-to-noise ratios, and have superior aging characteristics compared to visible LEDs, ensuring long-term measurement stability.

How does LED quality affect encoder accuracy?

LED intensity stability, wavelength consistency, thermal characteristics, and beam collimation directly impact encoder resolution, repeatability, and temperature performance. High-quality LEDs maintain consistent output over temperature variations and operational life.

Can visible red LEDs be used instead of infrared?

Yes, red LEDs (650-670nm) are used in some applications where visual alignment is helpful or specific material responses are required, but they generally have shorter lifetimes and greater sensitivity to ambient light interference than infrared options.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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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