INDUSTRY COMPONENT

Aperture Stop/Iris

Aperture stop/iris is an adjustable diaphragm in optical systems that controls light intensity and depth of field by varying the opening size.

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Component Specifications

Definition
An aperture stop, commonly called an iris, is a mechanical component in optical lens assemblies that functions as a variable diaphragm. It consists of overlapping blades arranged in a circular pattern that can be adjusted to change the diameter of the central opening. This controls the amount of light passing through the optical system, regulates the numerical aperture, and affects depth of field, resolution, and image quality. In industrial applications, it's critical for precision imaging, microscopy, photography, and optical measurement systems.
Working Principle
The aperture stop operates on the principle of adjustable obstruction. Multiple thin metal blades are arranged radially and connected to a control mechanism. When adjusted, the blades move simultaneously to create a circular opening of variable diameter. This opening acts as the limiting aperture that determines which light rays from the object pass through the optical system. Smaller openings increase depth of field but reduce light intensity, while larger openings allow more light but decrease depth of field.
Materials
Typically made from stainless steel (grades 304 or 316 for corrosion resistance), aluminum alloys (for lightweight applications), or specialized plastics (for cost-sensitive applications). Blades are precision-stamped or laser-cut with thickness ranging from 0.1mm to 0.5mm. Surface treatments include black anodizing (aluminum) or black oxide coating (steel) to minimize light reflection.
Technical Parameters
  • Control Type Manual, Electric, or Pneumatic
  • Mounting Type C-mount, CS-mount, or Custom
  • Repeatability ±0.01mm
  • Blade Material Stainless Steel 304/316
  • Diameter Range 1mm to 50mm
  • Number of Blades 5 to 15 blades
  • Operating Temperature -20°C to +80°C
Standards
ISO 10110, ISO 9022, DIN 3140, DIN 58185

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Aperture Stop/Iris.

aperture stop iris diaphragm optical diaphragm variable aperture light control mechanism optical component depth of field control lens assembly part Aperture Stop/Iris Aperture Stop/Iris in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Optical Lens Assembly

A precision optical component system that focuses light onto the sensor in a line scan camera.

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Engineering Analysis

Risks & Mitigation
  • Mechanical wear of blade pivots
  • Contamination accumulation on blades
  • Calibration drift over time
  • Inconsistent aperture shape at small openings
  • Light leakage through blade gaps
FMEA Triads
Trigger: Wear in blade pivot mechanisms
Failure: Irregular aperture shape, inconsistent light control
Mitigation: Use hardened steel bushings, regular lubrication, implement wear monitoring
Trigger: Contamination buildup on blade surfaces
Failure: Reduced light transmission, scattered light, image artifacts
Mitigation: Sealed housing design, regular cleaning protocols, cleanroom installation when possible
Trigger: Control mechanism backlash
Failure: Poor repeatability, inaccurate aperture settings
Mitigation: Anti-backlash gears, precision stepper motors, closed-loop feedback systems

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Aperture diameter tolerance: ±0.02mm or 2% of setting, whichever is greater. Circularity tolerance: 0.01mm maximum deviation from perfect circle.
Test Method
ISO 9039 for measurement of aperture diameter, ISO 15795 for optical distortion testing, visual inspection under 10x magnification for blade alignment and surface defects.

Buyer Feedback

★★★★☆ 4.8 / 5.0 (32 reviews)

"Standard OEM quality for Computer, Electronic and Optical Product Manufacturing applications. The Aperture Stop/Iris arrived with full certification."

"Great transparency on the Aperture Stop/Iris components. Essential for our Computer, Electronic and Optical Product Manufacturing supply chain."

"The Aperture Stop/Iris we sourced perfectly fits our Computer, Electronic and Optical Product Manufacturing production line requirements."

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Frequently Asked Questions

What is the difference between aperture stop and field stop?

The aperture stop controls the brightness and depth of field by limiting the cone of light entering the system, while the field stop controls the field of view by limiting the size of the image formed.

How does the number of blades affect optical performance?

More blades create a more circular aperture shape, resulting in smoother out-of-focus areas (bokeh) and more consistent light transmission. Fewer blades create polygonal aperture shapes that can affect diffraction patterns.

Can aperture stops be automated in industrial applications?

Yes, electric and pneumatic iris mechanisms allow for automated control, enabling dynamic adjustment during operation for applications like machine vision, automated microscopy, and adaptive optical systems.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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