Editorial Technical Reference

Light Source & Sensor (Optical Type)

This page explains how Light Source & Sensor (Optical Type) is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

An integrated optical component within an encoder that generates and detects light patterns to measure position or speed.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Light Source & Sensor (Optical Type)

Definition
This component is a critical sub-assembly within optical encoders used in servo systems. It combines a light-emitting element, typically a gallium arsenide (GaAs) LED, and a silicon photodiode array. The light source emits a beam that passes through or reflects off a coded disk with alternating transparent and opaque segments. The photodetector array detects the modulated light pattern and converts it into electrical signals. These signals are processed to determine angular or linear position, velocity, and direction, enabling closed-loop servo control. The component's performance is characterized by parameters such as wavelength (630–680 nm), output type (TTL/HTL), supply voltage (5–24 V DC), current consumption (20–60 mA), resolution (50–5000 PPR), accuracy (±0.05° to ±0.5°), operating temperature (-40 to 85 °C), storage temperature (-40 to 100 °C), humidity (0–95% RH), ingress protection (IP54–IP67 per IEC 60529), vibration resistance (10–2000 Hz per IEC 60068-2-6), shock resistance (50–100 g per IEC 60068-2-27), and weight (10–50 g). These values are reference ranges and must be verified for the specific model and application. The component is typically encapsulated in epoxy with copper alloy leads. Selection requires consideration of resolution, accuracy, environmental conditions, and electrical interface. Verification with the manufacturer is essential to confirm compliance with standards and suitability for the intended use. Maintenance signals include degraded signal quality or erratic output, which may indicate LED aging or contamination. Failure boundaries include exceeding temperature or humidity limits, which can cause permanent damage.
Working Principle
The light source emits a beam that passes through a rotating code disk with alternating transparent and opaque segments. The sensor detects the modulated light pattern, converting it into electrical signals. These signals are processed to determine position based on the pattern's phase and frequency.
Common Materials
Gallium Arsenide (GaAs) LED, Silicon Photodiode Array, Epoxy Encapsulant, Copper Alloy Leads
Technical Parameters
ParameterTypical rangeNotes & selection driver
Wavelength630–680 nmVisible red LED typical; affects resolution and contrast.
Output TypeTTL/HTLTTL for short distances, HTL for longer cable runs.
Supply Voltage5–24 V DC5 V typical for TTL, 10–30 V for HTL.
Current Consumption20–60 mADepends on LED power and output stage.
Resolution50–5000 PPRPulses per revolution; higher for precision applications.
Accuracy±0.05–±0.5 °Angular accuracy; tighter for high-end encoders.
Operating Temperature-40–85 °CExtended range for industrial environments.
Storage Temperature-40–100 °CNon-operating limit.
Humidity0–95 % RHNon-condensing.
Ingress ProtectionIP54–IP67Higher IP for dusty or wet environments.IEC 60529
Vibration Resistance10–2000 HzSinusoidal vibration; amplitude varies with frequency.IEC 60068-2-6
Shock Resistance50–100 gHalf-sine pulse, 11 ms duration.IEC 60068-2-27
Weight10–50 gDepends on housing material and size.

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 beam
    Material: Gallium Arsenide (GaAs)
  • Photodiode Array
    Detects light patterns and converts to electrical signals
    Material: Silicon
  • Lens Assembly
    Focuses and collimates the light beam
    Material: Optical-grade acrylic or glass
  • Signal Conditioning Circuit
    Amplifies and shapes the raw sensor signals
    Material: Silicon (integrated circuit)

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Light Source & Sensor (Optical Type).

Applied To / Applications

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

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 0 to 1 bar (non-pressurized applications)
other spec: Max vibration: 20g, Max shock: 100g, 11ms, IP rating: IP50 (dust-protected)
temperature: -20°C to +85°C
Media Compatibility
✓ Clean air environments ✓ Non-corrosive gases ✓ Dry, non-abrasive surfaces
Unsuitable: High-moisture, condensing, or liquid immersion environments
Sizing Data Required
  • Required resolution (pulses per revolution)
  • Maximum rotational speed (RPM)
  • Mounting configuration and shaft diameter

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Lens contamination
Cause: Accumulation of dust, oil, or debris on optical surfaces, leading to signal attenuation or complete blockage.
LED/photodiode degradation
Cause: Thermal stress, overcurrent, or aging causing reduced light output or sensitivity, resulting in unreliable detection.
Maintenance Indicators
  • Intermittent or unstable signal output despite clean environment
  • Visible discoloration, fogging, or deposits on the lens surface
Engineering Tips
  • Implement regular cleaning schedules with appropriate solvents and lint-free wipes, avoiding abrasive materials.
  • Ensure proper electrical protection (surge suppression, current limiting) and maintain stable operating temperatures within manufacturer specifications.

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 13694:2018 - Test methods for laser beam power (energy) density distribution ANSI/IESNA RP-16-17 - Nomenclature and Definitions for Illuminating Engineering DIN EN 62471:2008 - Photobiological safety of lamps and lamp systems

Quoted from the published standard.

Manufacturing Precision
  • Beam alignment: +/-0.5° angular deviation
  • Spectral output stability: +/-2% over operating temperature range
Quality Inspection
  • Radiometric/Photometric calibration verification
  • Environmental stress testing (thermal cycling, vibration)

Manufacturers of Light Source & Sensor (Optical Type)

Manufacturer profiles associated with Light Source & Sensor (Optical Type).

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Frequently Asked Questions

What is the typical wavelength range for the light source?

The typical wavelength range is 630–680 nm, which is visible red light. This affects resolution and contrast in the encoder system.

What output types are available?

Output types include TTL for short distances and HTL for longer cable runs. The choice depends on the application's cable length and noise immunity requirements.

What supply voltage is required?

The supply voltage range is 5–24 V DC. Typically, 5 V is used for TTL outputs, while 10–30 V is used for HTL outputs, but the exact requirement must be verified for the specific model.

What is the operating temperature range?

The operating temperature range is -40 to 85 °C, with a storage temperature range of -40 to 100 °C. These are reference values and should be confirmed with the manufacturer for the specific component.

Data Basis

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

Preliminary Technical Classification
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