Classification and Selection Methods for Industrial Lenses

Classification and Selection Methods for Industrial Lenses

Industrial lenses are crucial components in machine vision systems, impacting key aspects of imaging quality. Proper lens selection can determine the success of a machine vision system. Here's an overview of how to classify and select industrial lenses:

1. Classification of Industrial Lenses

• Based on Effective Image Circle Size:

  • Industrial lenses can be categorized into TV camera lenses, cinema camera lenses, and camera lenses. TV camera lenses are further divided into various sizes, including 1/4 inch, 1/3 inch, 1/2 inch, 2/3 inch, and 1 inch.

• Based on Focal Length:

  • Lenses are divided into fixed-focal lenses and zoom lenses. Fixed-focal lenses include fish-eye lenses, wide-angle lenses, standard lenses, and telephoto lenses. Zoom lenses can be either manually or electrically adjustable.

• Based on Lens Mount Type:

  • The most common types include C-mount, CS-mount, F-mount, V-mount, T2-mount, Leica-mount, M42-mount, and M50-mount. Each mount type has a unique design that determines compatibility with industrial cameras.

• Other Special Types:

  • Microscope Lenses are typically used for high magnifications, generally for imaging ratios greater than 10:1.
  • Macro Lenses are designed for imaging ratios between 2:1 and 1:4.
  • Telecentric Lenses correct traditional lens perspective issues, providing a consistent magnification across varying object distances.
  • Ultraviolet and Infrared Lenses are designed specifically for ultraviolet and infrared wavelengths, respectively.

2. Selection Methods for Industrial Lenses

• Based on Aperture Type:

  • Industrial lenses can have either manual or automatic apertures. Manual apertures are suitable for stable lighting conditions, while automatic apertures adapt to changing light. Automatic apertures can be DC-controlled or video-controlled.

• Based on Lens Specifications:

  • The lens specification generally depends on sensor size. The field of view decreases as focal length increases. In contrast, a larger sensor size results in a wider field of view but less detail.

• Fixed Focal Length Lenses:

  • These lenses have a fixed focal length and are generally used in stable conditions. They can have adjustable or fixed apertures. Adjustable apertures can be manually set, while fixed apertures maintain constant light transmission.

• Zoom Lenses:

  • These lenses offer variable focal lengths, allowing for flexible zoom adjustments. Zoom lenses can be manually adjusted or controlled electrically for auto-focus and other features.

• Lens Compatibility with Industrial Cameras:

  • Compatibility involves matching lens mounts, focal distances, and image sensor sizes. C-mount lenses require a different back focal distance compared to CS-mount lenses. Adapters may be needed to match incompatible mounts.

Overall, the selection of industrial lenses depends on the specific requirements of the machine vision system, such as precision, field of view, and environmental factors. Proper alignment of lens specifications with system needs ensures optimal performance and imaging quality.