Telecentric zoom lenses are designed to correct parallax issues found in traditional industrial lenses. These lenses ensure that the image magnification remains constant within a certain object distance range, which is critical when the objects being measured are not on the same plane. Telecentric lenses are valued in machine vision applications due to their unique parallel optical path design, providing low distortion and high precision.
Key Optical Characteristics of Telecentric Zoom Lenses
- High Resolution: Enables precise imaging with high detail.
- Ultra-Wide Depth of Field: Allows for sharp focus over a large depth range.
- Ultra-Low Distortion: Reduces image distortion significantly.
- Parallel Optical Design: Ensures consistent magnification across the field of view.
Main Categories of Telecentric Zoom Lenses
Telecentric zoom lenses are mainly categorized into object-side telecentric lenses, image-side telecentric lenses, and double-sided telecentric lenses.
1. Object-Side Telecentric Lenses
In object-side telecentric lenses, the aperture stop is placed at the image-side focal plane. With the aperture at this position, even when the object distance changes, the image size does not change, ensuring consistent measurements. These lenses are used for industrial precision measurement, offering very low distortion.
2. Image-Side Telecentric Lenses
In image-side telecentric lenses, the aperture stop is located at the object-side focal plane. This arrangement keeps the chief rays parallel to the optical axis. It ensures that even if the CCD sensor's position changes, the image size remains constant. These lenses are less commonly used in industrial applications but have unique applications in specific setups.
3. Double-Sided Telecentric Lenses
Double-sided telecentric lenses combine the benefits of object-side and image-side telecentric lenses. In industrial image processing, object-side telecentric lenses are generally preferred, while double-sided telecentric lenses are used for specific applications requiring both advantages. In industrial image processing and machine vision, image-side telecentric lenses are generally less common due to their limited applications.
Conclusion
Telecentric zoom lenses are a crucial component in various industrial applications, offering high precision and low distortion imaging. Understanding the main categories of telecentric lenses can help in choosing the right lens for specific applications. If you need more information about telecentric zoom lenses, please contact us for further assistance.
FALenses Technology specializes in providing machine vision core hardware. You can go to the official website of FALenses Technology at https://www.falenses.com/ for more information.