Editorial Technical Reference

Projection Lens Assembly

This page explains how Projection Lens Assembly 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

Optical assembly that focuses and projects structured light patterns from a projector source onto a target surface.

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Projection Lens Assembly in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Projection Lens Assembly

Definition
The Projection Lens Assembly is a critical optical component within a Structured Light Projector. It receives the structured light pattern generated by the light source and modulator (e.g., DLP, LCoS) and precisely focuses it onto the target object or surface. This assembly determines the projection's field of view, resolution, distortion characteristics, and working distance, directly impacting the accuracy of the 3D scanning or measurement system. The assembly consists of multiple lens elements arranged to correct optical aberrations such as spherical, chromatic, and distortion. It collects the diverging structured light beam from the projector's image source, collimates or converges it, and forms a sharp, defined image of the pattern at the intended projection plane or volume. Its design ensures minimal pattern distortion for accurate spatial encoding. Typical specifications include focal length ranging from 8 to 50 mm, aperture (F-number) from 1.8 to 2.8, diagonal field of view from 60 to 120 degrees, MTF at 30 lp/mm of at least 0.5 (per ISO 12233), distortion of 1.0% or less, back focal length from 10 to 30 mm, operating temperature from -10 to 50 °C, storage temperature from -20 to 70 °C, relative humidity (operating) from 20% to 80% RH, ingress protection from IP40 to IP54, lens material glass, and weight from 50 to 200 g. Materials commonly used include optical glass (e.g., BK7, fused silica), aluminum for housing or barrel, and plastic for specific lens elements or mounts. These values are directory reference ranges and must be confirmed for the actual model and application with the legal manufacturer or supplier.
Working Principle
The assembly consists of multiple lens elements arranged to correct optical aberrations like spherical, chromatic, and distortion. It collects the diverging structured light beam from the projector's image source, collimates or converges it, and forms a sharp, defined image of the pattern at the intended projection plane or volume. Its design ensures minimal pattern distortion for accurate spatial encoding.
Common Materials
Optical Glass (e.g., BK7, Fused Silica), Aluminum (for housing/barrel), Plastic (for specific lens elements or mounts)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Focal Length8–50 mmDetermines projection distance and image size.
Aperture (F-number)1.8–2.8Affects light throughput and depth of field.
Field of View (Diagonal)60–120 °Defines coverage area at a given distance.
MTF at 30 lp/mm≥0.5Ensures resolution for structured light patterns.ISO 12233
Distortion≤1.0 %Low distortion critical for pattern accuracy.
Back Focal Length10–30 mmSpace for optical components and sensor.
Operating Temperature-10–50 °CThermal drift affects focus and alignment.IEC 60068-2-1/2
Storage Temperature-20–70 °CSurvival range for shipping and storage.IEC 60068-2-1/2
Relative Humidity (Operating)20–80 % RHCondensation can cause lens fogging.IEC 60068-2-78
Ingress ProtectionIP40–IP54Dust and splash resistance for industrial use.IEC 60529
Lens MaterialGlassGlass for thermal stability and scratch resistance.
Weight50–200 gAffects mounting and mechanical design.

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
  • Lens Elements Part
    Refract light to focus the image and correct optical aberrations (spherical, chromatic, distortion).
    Material: Optical Glass/Plastic
  • Lens Barrel/Housing
    Precisely holds and aligns all lens elements along the optical axis; provides mechanical stability and mounting interface.
    Material: Aluminum/Engineering Plastic
  • Aperture Stop Part
    Controls the amount of light passing through the lens and influences depth of field.
    Material: Steel/Aluminum
  • Mounting Flange Part
    Provides the standardized mechanical interface (e.g., C-mount, F-mount) to attach the assembly to the projector body.
    Material: Stainless Steel/Aluminum

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1.5 bar
other spec: Max humidity: 85% RH non-condensing
temperature: -10°C to +50°C (operating), -20°C to +70°C (storage)
Media Compatibility
✓ Clean air environments ✓ Controlled laboratory atmospheres ✓ Dry industrial enclosures
Unsuitable: High particulate/dust environments
Sizing Data Required
  • Projector source wavelength (nm)
  • Required projection distance (mm)
  • Desired pattern size/field of view (mm)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Optical surface contamination/degradation
Cause: Accumulation of dust, oil mist, or chemical residues from the environment or adjacent components, leading to reduced light transmission, scattering, or focal point distortion.
Mechanical misalignment or loosening
Cause: Vibration from motors or conveyors, thermal cycling causing differential expansion, or improper handling during maintenance, resulting in loss of precise optical alignment and degraded image quality or focus.
Maintenance Indicators
  • Visible haze, streaks, or particulate deposits on lens surfaces when inspected with a bright light at an angle.
  • Audible rattling or clicking from the assembly during machine operation, indicating loose mounting hardware or internal components.
Engineering Tips
  • Implement a controlled, clean environment (e.g., positive pressure, HEPA filtration) around the assembly and use only approved, lint-free wipes and optical-grade cleaners for any manual cleaning.
  • Establish a vibration monitoring program on supporting structures and schedule periodic optical alignment checks using laser or autocollimator tools, following a torque procedure for all fasteners.

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 10110-7:2017 - Optical components and systems - Surface imperfection tolerances ANSI/OPEI B175.1-2017 - Safety requirements for optical instruments DIN 3140-7:2018 - Optical components - Tolerances for lens assemblies

Quoted from the published standard.

Manufacturing Precision
  • Centering tolerance: +/-0.01mm
  • Surface roughness: Ra ≤ 0.05μm
Quality Inspection
  • Interferometric surface flatness test
  • MTF (Modulation Transfer Function) performance verification
Technical documentation
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Manufacturing capability
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Inspection readiness
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Supplier transparency
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Manufacturers of Projection Lens Assembly

Manufacturer profiles associated with Projection Lens Assembly.

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Frequently Asked Questions

What is the primary function of a Projection Lens Assembly?

It focuses and projects structured light patterns from a projector source onto a target surface, determining the projection's field of view, resolution, distortion, and working distance, which are critical for accurate 3D scanning or measurement.

What are typical specifications for this assembly?

Typical ranges include focal length 8–50 mm, aperture F/1.8–2.8, diagonal field of view 60–120°, MTF ≥0.5 at 30 lp/mm (ISO 12233), distortion ≤1.0%, back focal length 10–30 mm, operating temperature -10 to 50 °C, storage -20 to 70 °C, humidity 20–80% RH, IP40–IP54, glass lens material, and weight 50–200 g. Confirm with the manufacturer.

How does the assembly affect 3D scanning accuracy?

The lens assembly's optical quality directly influences pattern sharpness and distortion. Low distortion and high MTF ensure that the projected pattern is accurately encoded, which is essential for precise spatial mapping in 3D scanning systems.

What materials are commonly used in its construction?

Optical glass (e.g., BK7, fused silica) for lens elements, aluminum for housing or barrel, and plastic for certain lens elements or mounts. These materials provide thermal stability, scratch resistance, and lightweight construction.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Related equipment

Applied To / Applications

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

Structured Light Projector
View system integration details
3D Optical Sensor Head
View system integration details

Industrial Ecosystem & Supply Chain Structure

Data Basis

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

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.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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