Optical Lens Assembly for Line Scan Cameras

Product Specifications

Technical details and manufacturing context for Optical Lens Assembly

Definition

The optical lens assembly in a line scan camera is a critical component responsible for collecting and focusing incoming light onto the linear sensor array. It ensures high-resolution image capture by precisely controlling the optical path, minimizing aberrations, and maintaining consistent focus across the entire scan line. Its performance directly impacts the camera's resolution, contrast, and overall image quality in industrial inspection and measurement applications.

This assembly typically comprises multiple lens elements arranged to correct optical aberrations such as chromatic and spherical aberration. Light from the target passes through these elements, which refract the light rays to converge them precisely onto the linear sensor's photodiodes, forming a sharp, focused image of a single line of the object being scanned. The assembly is designed for use in line scan cameras, which are commonly employed in industrial inspection, web inspection, and measurement systems where continuous, high-speed imaging of moving objects is required.

Key specifications include a focal length range of 16–100 mm, which determines the field of view and magnification. The aperture range of F1.4–F16 controls light throughput and depth of field. The image circle of φ43.3 mm covers 35mm full frame sensors. The modulation transfer function (MTF) is specified as ≥0.3 at 200 lp/mm, indicating minimum contrast at the center. Distortion is limited to ≤0.5% maximum radial distortion across the field. Back focal length is adjustable from 17.5 to 20.0 mm for sensor alignment. Operating temperature ranges from -20 to 70 °C, and storage temperature from -40 to 85 °C, with relative humidity up to 85% non-condensing. Ingress protection is rated IP54–IP65 per IEC 60529. The lens material is CDGM H-K9L optical glass with low bubble inclusion, conforming to GB/T 7665. A single layer anti-reflective coating of MgF2 provides 99.5% transmission. Weight varies from 120 to 180 g depending on focal length and barrel design. The mount type is C-Mount with a standard 1"-32 UN thread.

When selecting or verifying this assembly, confirm model-specific values and standards with the legal manufacturer or supplier, as the listed ranges are reference values for the product family.

Working Principle

The assembly consists of multiple lens elements arranged to correct optical aberrations (like chromatic and spherical aberration). Light from the target passes through these elements, which bend (refract) the light rays to converge them precisely onto the linear sensor's photodiodes, forming a sharp, focused image of a single line of the object being scanned.

Common Materials

Optical Glass (e.g., BK7, Fused Silica), Aluminum (for housing/mount)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Focal Length	16–100 mm	Determines field of view and magnification
Aperture Range	F1.4–F16	Controls light throughput and depth of field
Image Circle	φ43.3 mm	Covers 35mm full frame sensors
Modulation Transfer Function	≥0.3@200lp/mm	Minimum contrast at center for 200 lp/mm
Distortion	≤0.5 %	Max radial distortion across field
Back Focal Length	17.5–20.0 mm	Adjustable for sensor alignment
Operating Temperature	-20–70 °C	Beyond range may cause focus shift
Storage Temperature	-40–85 °C	Non-condensing environment
Relative Humidity	≤85 %RH	Non-condensing
Ingress Protection	IP54–IP65	Protection against dust and water jetsIEC 60529
Lens Material	CDGM H-K9L	Optical glass with low bubble inclusionGB/T 7665
Coating	MgF2, 99.5%	Single layer anti-reflective coating
Weight	120–180 g	Depends on focal length and barrel design
Mount Type	C-Mount	Standard 1"-32 UN thread

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 it onto the sensor. Multiple elements correct for optical aberrations.

Material: Optical Glass (e.g., BK7, SF11)
Lens Barrel/Housing
Holds all lens elements in precise alignment and provides mounting interface to the camera.

Material: Aluminum (often black anodized)
Aperture Stop/Iris Part
Controls the amount of light entering the lens and affects depth of field (may be fixed in many line scan lenses).

Material: Stainless Steel or Aluminum
Mounting Flange Part
Standardized interface (e.g., C-mount, F-mount) for attaching the lens assembly to the line scan camera body.

Material: Stainless Steel

Applied To / Applications

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

Line Scan Camera

View system integration details

Transmitter Unit

View system integration details

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Frequently Asked Questions

What is the typical focal length range for this lens assembly?

The focal length range is 16–100 mm, which determines the field of view and magnification. The exact value depends on the specific model and application requirements.

What is the maximum distortion specified?

The maximum radial distortion across the field is ≤0.5%. This helps ensure accurate image geometry for measurement applications.

What is the operating temperature range?

The operating temperature range is -20 to 70 °C. Beyond this range, focus shift may occur. Storage temperature is -40 to 85 °C, non-condensing.

What mount type does this lens use?

It uses a C-Mount with a standard 1"-32 UN thread. This is a common interface for industrial cameras, but verify compatibility with your camera.

Data Basis

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Preliminary Technical Classification

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pressure:	Atmospheric to 1.5 bar
other spec:	Humidity: 0-85% RH non-condensing, Vibration: <5g RMS
temperature:	-20°C to +70°C (operating), -40°C to +85°C (storage)

Optical Lens Assembly

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards