Editorial Technical Reference

Light Source/Detector (for optical encoders)

This page explains how Light Source/Detector (for optical encoders) is classified within Computer, Electronic and Optical Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

Integrated optical component that generates and senses light signals for position detection in optical encoders.

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Product Specifications

Technical details and manufacturing context for Light Source/Detector (for optical encoders)

Definition
This product is a critical sub-assembly within optical encoders, combining both light emission and detection functions in a single integrated component. The light source, typically an infrared LED, illuminates the patterned encoder disc, while the detector, a photodiode array, captures the reflected or transmitted light to generate electrical signals representing position, speed, or direction information. The component is designed for use in computer, electronic, and optical product manufacturing, specifically as a part-level component for optical encoder systems. It operates by emitting light onto the encoder disc, where alternating transparent and opaque patterns modulate the light intensity as the disc rotates. The detector converts these optical variations into corresponding electrical signals, which are then processed to determine precise position data. Key parameters include a wavelength range of 850–940 nm, differential output type, supply voltage of 5 V DC ±10%, supply current of 10–30 mA, output frequency of 100–500 kHz, operating temperature range of -40 to 85 °C, storage temperature range of -40 to 100 °C, humidity range of 5–95% RH (non-condensing), ingress protection rating of IP40–IP67 per IEC 60529, package size of 5–15 mm, and weight of 1–5 g. The materials used include gallium arsenide (GaAs) for LEDs, silicon for photodiodes, epoxy resin encapsulation, and copper alloy leads. This component is available in a compact package for integration into encoder modules. It is important to verify model-specific values and standards with the legal manufacturer or supplier, as the listed parameters are typical reference ranges and may vary by application. The component's performance directly affects encoder resolution and reliability, making it essential to select the appropriate version for the intended operating environment.
Working Principle
The light source emits infrared light onto a patterned encoder disc. As the disc rotates, the alternating transparent and opaque pattern modulates the light intensity reaching the detector. The detector, a photodiode array, converts these optical variations into electrical signals. These signals are then processed to determine precise position, speed, or direction information. The differential output type enhances noise immunity, and the output frequency range supports various encoder resolutions.
Common Materials
Gallium Arsenide (GaAs) for LEDs, Silicon for photodiodes, Epoxy resin encapsulation, Copper alloy leads
Technical Parameters
ParameterTypical rangeNotes & selection driver
Wavelength850–940 nmDetermines compatibility with encoder scale and detector sensitivity.
Output TypeDifferentialDifferential output improves noise immunity.
Supply Voltage5 ±10% V DCTypical for encoder modules.
Supply Current10–30 mAIncludes LED drive and detector electronics.
Output Frequency100–500 kHzHigher frequency enables higher encoder resolution.
Operating Temperature-40–85 °CExtended range for industrial applications.
Storage Temperature-40–100 °CSurvival range without damage.
Humidity5–95 % RHNon-condensing.
Ingress ProtectionIP40–IP67Higher IP for harsh environments.IEC 60529
Light Source TypeLEDInfrared LED with high reliability.
Detector TypePhotodiode arrayArray provides quadrature signals.
Package Size5–15 mmLength or diameter; compact for integration.
Weight1–5 gLightweight for moving parts.

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

Components / BOM
  • LED Chip Part
    Generates infrared or visible light through electroluminescence
    Material: Gallium Arsenide (GaAs) semiconductor
  • Photodiode Array
    Converts modulated light patterns into electrical current signals
    Material: Silicon semiconductor
  • Optical Lens Part
    Focuses and collimates light beam for precise pattern illumination
    Material: Optical-grade acrylic or glass
  • Signal Conditioning Circuit
    Amplifies and processes raw detector signals
    Material: Printed circuit board with copper traces

Industry Taxonomies & Aliases

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

for optical encoders

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Encoder/Resolver
View system integration details
Position Feedback Encoder
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric (non-pressurized)
other spec: Wavelength: 850-950 nm, Response Time: <100 ns
temperature: -40°C to +85°C
Media Compatibility
✓ Clean air environments ✓ Sealed encoder housings ✓ Non-corrosive industrial atmospheres
Unsuitable: Direct exposure to abrasive particles or conductive dust
Sizing Data Required
  • Encoder resolution (lines per revolution)
  • Required signal-to-noise ratio
  • Mounting distance to code disk

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Optical Contamination
Cause: Accumulation of dust, oil, or debris on the light source or detector surfaces, causing signal attenuation or complete loss due to reduced light transmission or reflection.
LED/Laser Degradation
Cause: Gradual reduction in light output intensity over time due to thermal stress, current overload, or aging of semiconductor components, leading to unreliable signal detection.
Maintenance Indicators
  • Intermittent or erratic encoder readings during operation
  • Visible accumulation of contaminants on optical surfaces or audible grinding noises from mechanical components
Engineering Tips
  • Implement regular cleaning schedules using appropriate solvents and lint-free wipes to maintain optical clarity, and ensure proper sealing against environmental contaminants.
  • Monitor operating temperature and ensure adequate heat dissipation for the light source, and use current-limiting circuits to prevent overdriving LEDs or lasers.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 16063-1:1998 (Vibration and shock sensor calibration) ANSI/ASME B46.1-2019 (Surface texture)

Quoted from the published standard.

Manufacturing Precision
  • Bore concentricity: +/-0.01mm
  • LED/Laser alignment: +/-0.05° angular tolerance
Quality Inspection
  • Optical power output verification test
  • Environmental stress screening (temperature/humidity cycling)

Manufacturers of Light Source/Detector (for optical encoders)

Manufacturer profiles associated with Light Source/Detector (for optical encoders).

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Frequently Asked Questions

What is the typical wavelength range for this component?

The typical wavelength range is 850–940 nm, which determines compatibility with the encoder scale and detector sensitivity. Verify the exact wavelength for your specific model.

What is the supply voltage requirement?

The supply voltage is typically 5 V DC ±10%. Ensure your system provides this voltage to operate the component within its specified range.

What is the operating temperature range?

The operating temperature range is -40 to 85 °C, suitable for industrial applications. The storage temperature range is -40 to 100 °C, and humidity should be 5–95% RH non-condensing.

What ingress protection ratings are available?

The component is available with ingress protection ratings from IP40 to IP67 per IEC 60529. Higher ratings are suitable for harsh environments. Confirm the specific rating for your model.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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