In the field of industrial vision inspection, lens selection directly determines imaging quality and detection accuracy. Telecentric lenses, with their unique optical design, offer irreplaceable advantages in specific scenarios. In the following five situations, confidently choose telecentric lenses to effortlessly resolve selection dilemmas!

1. Need to measure the thickness or depth of an object

① Scenario Pain Point: Conventional lenses suffer from perspective distortion (near objects appearing larger than distant ones), leading to significant measurement errors when assessing object thickness. For instance, when measuring a metal plate's thickness, the displayed values at the edge and center may differ by over 10%.

② Telecentric Advantages: Telecentric lenses employ a parallel optical path design where the object-side principal rays are strictly parallel to the optical axis. This eliminates perspective distortion, ensuring thickness measurement errors below 0.5%. They are particularly suitable for precision machining, semiconductor packaging, and similar applications.

2. The placement position of objects exhibits significant fluctuations.

① Scenario Pain Point: When an object shifts position within the field of view, conventional lenses produce varying image sizes (e.g., a 1mm front-to-back movement may cause up to a 5% change in image dimensions), rendering detection algorithms ineffective.

② Telecentric Advantage: Telecentric lenses feature “object-side telecentricity.” When objects move within the working distance range, the image size remains constant, allowing for object position fluctuations up to ±10% of the working distance. This makes them suitable for scenarios like part positioning and assembly inspection in automated production lines.

3. Measure the true diameter of the cylinder.

① Scenario Pain Point: When capturing cylindrical objects with standard lenses, perspective distortion causes circular cross-sections to appear elliptical, resulting in diameter measurement errors exceeding 5%. For example, measuring a 10mm diameter cylinder may yield a displayed diameter of 9.5–10.5mm.

② Telecentric Advantage: Telecentric lenses eliminate perspective distortion in cylindrical objects, ensuring circular cross-sections are imaged as perfect circles. This achieves diameter measurement accuracy within 0.1%, making them ideal for dimensional inspection of cylindrical parts like bearings and bolts.

4. Extremely high precision is required for edge positioning (e.g., PCB alignment).

① Scenario Pain Points: Conventional lenses suffer from distortion (e.g., barrel distortion, pincushion distortion), causing edge positioning errors of up to 3-5 pixels. This results in PCB alignment deviations exceeding 0.1mm.

② Telecentric Advantages: Telecentric lenses feature distortion rates below 0.05%, achieving edge positioning accuracy of ±1 pixel. This ensures PCB alignment errors remain under 0.01mm, making them ideal for high-precision applications like SMT placement and semiconductor packaging.

5. Distortion-free images are required for comparison.

① Scenario Pain Points: Distorted images from standard lenses can lead to misjudgments during direct comparisons. For instance, in pharmaceutical packaging inspection, label distortion under standard lenses may be mistaken for printing defects.

② Telecentric Advantages: Telecentric lenses deliver distortion-free images, ensuring comparison algorithms accurately identify genuine defects (such as blurred text or misaligned patterns). This makes them ideal for quality inspection scenarios like pharmaceutical packaging and food labeling.

Selection Guide：Precision in thickness and depth is key, Don't panic over positional variations; Measure diameters for true cylindrical roundness, High standards for edge positioning; Choose telecentric lenses for distortion-free comparison, Keep the golden rule in mind!