INDUSTRY COMPONENT

Light source/LED

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

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
ParameterTypical rangeNotes & selection driver
Lifetime>50,000 hours
Wavelength630-950 nm
Viewing Angle15-30 degrees
Rise/Fall Time<100 ns
Forward Current20-50 mA
Forward Voltage1.8-3.6 V
Optical Power Output1-10 mW
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, IEC 60747-5, DIN 5032

Parent Products

This component is used in the following industrial products

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

Typical Suppliers & Equivalents

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

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 Light source/LED

Manufacturer profiles associated with Light source/LED.

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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.

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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