Telecentric ZOOM LENSes are professional industrial lenses that combine telecentric optical principles with continuous zoom functionality. They allow for free adjustment of magnification whilst eliminating parallax distortion, maintaining precise imaging performance throughout the entire zoom range; they are the mainstream optical equipment used in modern precision dimensional inspection and visual defect screening.

In the field of machine vision for industrial inspection, standard lenses are highly susceptible to factors such as shooting distance and the angle at which objects are positioned, leading to issues such as variations in image size, blurred edges and inaccurate measurement data. As such, they are unable to meet the demands of high-precision production quality control; the advent of telecentric ZOOM LENSes has perfectly resolved this industry pain point.

In terms of its optical structure, this lens employs a proprietary telecentric optical design, ensuring that incident light remains parallel to the principal optical axis at all times. Consequently, regardless of the position of the workpiece within the field of view, there is no perspective distortion causing objects to appear larger when closer and smaller when further away. It also features a built-in zoom adjustment mechanism, allowing users to switch between different magnification levels with ease—without the need to change lenses or make significant adjustments to the equipment’s position. This enables both wide-area panoramic inspection and close-up inspection of small details, making it suitable for a wide range of inspection scenarios.

Compared with standard fixed-magnification telecentric lenses and ordinary ZOOM LENSes, its practical advantages are particularly striking.

1. Stable measurement accuracy effectively mitigates perspective distortion; slight workpiece displacement or height differences do not affect the imaging scale, ensuring consistent inspection data;

2. High flexibility of use: a single lens can cover the inspection of products of multiple specifications, significantly streamlining the configuration of vision equipment;

3. High imaging clarity with uniform focus across the entire field of view, clearly revealing minute defects such as fine scratches, dimensional deviations and assembly gaps on workpieces.

Its applications span numerous precision manufacturing sectors, including dimensional measurement of electronic components, tolerance inspection of precision metalwork,外观 screening of semiconductor components, contour inspection of small plastic parts, and quality inspection for defects in glass products. Whether for in-line automated inspection on production lines or offline precision sampling in laboratories, it performs reliably, meeting the efficient quality inspection requirements of industrial automation production.

On the left are the inspection results from a telecentric ZOOM LENS; on the right are the inspection results from a standard vision lens.

According to actual measurement data from industrial applications, under standard operating conditions, image distortion in telecentric ZOOM LENSES can be kept within 0.1 per cent. The magnification adjustment range covers the typical range used in mainstream industrial inspection applications, with a magnification error of less than 0.05 per cent within the working distance range. Image quality shows no significant deterioration during continuous, long-term operation, and nor do minor environmental vibrations or slight fluctuations in lighting interfere with imaging accuracy, fully meeting the stringent quality inspection standards of industrial production.

Thanks to their three core characteristics—precise imaging, flexible magnification adjustment and high stability—telecentric ZOOM LENSes have become an indispensable core component in high-end machine vision systems, continuously helping the manufacturing sector to improve product inspection accuracy and driving the steady advancement of industrial quality inspection towards automation, high precision and high efficiency.