Projection Lens Assembly for Structured Light Projectors

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

Parameter	Typical range	Notes & selection driver
Focal Length	8–50 mm	Determines projection distance and image size.
Aperture (F-number)	1.8–2.8	Affects light throughput and depth of field.
Field of View (Diagonal)	60–120 °	Defines coverage area at a given distance.
MTF at 30 lp/mm	≥0.5	Ensures resolution for structured light patterns.ISO 12233
Distortion	≤1.0 %	Low distortion critical for pattern accuracy.
Back Focal Length	10–30 mm	Space for optical components and sensor.
Operating Temperature	-10–50 °C	Thermal drift affects focus and alignment.IEC 60068-2-1/2
Storage Temperature	-20–70 °C	Survival range for shipping and storage.IEC 60068-2-1/2
Relative Humidity (Operating)	20–80 % RH	Condensation can cause lens fogging.IEC 60068-2-78
Ingress Protection	IP40–IP54	Dust and splash resistance for industrial use.IEC 60529
Lens Material	Glass	Glass for thermal stability and scratch resistance.
Weight	50–200 g	Affects 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

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

Manufacturers of 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.

Preliminary Technical Classification

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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)

Projection Lens Assembly

Product Specifications

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