INDUSTRY COMPONENT

Light source/LED

LED light source for optical encoders providing illumination for position sensing.

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Component Specifications

Definition
A solid-state light-emitting diode (LED) component specifically designed as the illumination source in optical encoders. It emits coherent or semi-coherent light that interacts with encoder discs or scales to create optical patterns detected by photodetectors, enabling precise measurement of rotational or linear position, speed, and direction in industrial machinery.
Working Principle
Operates on electroluminescence principle where electrical current passes through semiconductor material, causing electron-hole recombination that releases energy as photons (light). In encoder applications, this light is directed through or reflected off patterned encoder elements, creating modulated optical signals proportional to displacement.
Materials
Semiconductor: Gallium Arsenide (GaAs) or Gallium Phosphide (GaP) for infrared/visible spectrum; Aluminum Gallium Indium Phosphide (AlGaInP) for red; Indium Gallium Nitride (InGaN) for blue/green. Package: Epoxy resin or silicone encapsulation with ceramic substrate. Electrodes: Gold-plated copper alloy.
Technical Parameters
  • Lifetime >50,000 hours
  • Wavelength 630-950 nm
  • Viewing Angle 15-30 degrees
  • Rise/Fall Time <100 ns
  • Forward Current 20-50 mA
  • Forward Voltage 1.8-3.6 V
  • Optical Power Output 1-10 mW
  • Operating Temperature -40°C to +85°C
Standards
ISO 16063, IEC 60747-5, DIN 5032

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Light source/LED.

encoder LED optical encoder light source industrial LED component position sensing illumination machine vision lighting motion control LED Light source/LED Light source/LED in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Encoder

A device that converts mechanical motion into electrical signals to measure position, speed, or direction in servo/stepper motor systems.

View Product Details

Read Head

The sensor component in linear encoders that detects position by reading scale markings.

View Product Details

High-Resolution Encoder

A precision measurement device that converts angular position or motion of a rotary table into digital signals with high accuracy.

View Product Details

Engineering Analysis

Risks & Mitigation
  • Thermal degradation from inadequate heat sinking
  • Wavelength drift with temperature changes
  • Output power decay over time
  • Contamination of optical surfaces
  • Electrostatic discharge damage during handling
FMEA Triads
Trigger: Excessive forward current
Failure: Catastrophic LED burnout
Mitigation: Implement constant current drivers with overcurrent protection; derate operating current to 70% of maximum rating
Trigger: High ambient temperature
Failure: Accelerated lumen depreciation and wavelength shift
Mitigation: Design proper thermal management with heatsinks; monitor junction temperature; use high-temperature grade LEDs
Trigger: Optical surface contamination
Failure: Reduced light output and inconsistent encoder signals
Mitigation: Apply protective conformal coatings; implement cleanroom assembly procedures; design sealed encoder housings

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Wavelength tolerance ±5 nm, optical power tolerance ±15%, angular alignment tolerance ±2 degrees
Test Method
Spectroradiometric measurement per IEC 60747-5, photometric testing with integrating sphere, accelerated life testing at elevated temperatures

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 LEDs preferred over incandescent bulbs in modern encoders?

LEDs offer superior reliability with 50,000+ hour lifespan, faster response times (<100 ns vs milliseconds), lower power consumption, better temperature stability, and resistance to vibration/shock in industrial environments.

What wavelength is optimal for encoder applications?

Infrared (850-950 nm) provides best signal-to-noise ratio and immunity to ambient light interference, while visible red (630-660 nm) allows visual alignment during installation and maintenance.

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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