Application Background

In the modern manufacturing industry, the detection of characters and logos on precision parts such as cell phones, cell phone cases, TP (Touch Panel), LCD (Liquid Crystal Display), and lenses (lenses) is crucial. The characters and LOGO on these parts not only represent the brand and model of the product, but also an important identification of product quality and identity. Therefore, how to realize high-speed, stable and accurate character and LOGO detection has become a major challenge in the manufacturing industry.

Detection Requirements

1, high-speed and stable monitoring: due to the large number of products on the conveyor belt, and the production rhythm is compact, so the detection system must be able to high-speed and stable monitoring of each product on the characters and LOGO.

2, on-line alarm and rejection: when the characters or LOGO detected the existence of dirty spots, oil accumulation, hairline, less oil, scratches and other undesirable conditions, the system should be able to immediately trigger an alarm, and reject the defective products from the production line.

3、Appearance Quality Inspection: The inspection system should be able to comprehensively and meticulously inspect the appearance quality of characters and logos to ensure that each product meets the quality standards.

Detection Effect

As a high-precision, high-performance optical component, telecentric lenses show unique advantages in character and logo inspection.

1. Ultra-low distortion: Telecentric lenses can ensure that the image does not deform during transmission, thus ensuring the accuracy of the inspection results.
2. High Telecentricity: High telecentricity means that the lens is able to maintain a high degree of vertical magnification consistency during the imaging process, which is critical for accurate measurement and positioning.
3. High Depth of Field: The magnification of the telecentric lens and the size of the target image remain constant over the depth of field range, which allows the system to achieve consistent inspection results at different distances.
4. Optional Coaxial Light Illumination: Coaxial light illumination provides uniform lighting conditions, which further improves detection accuracy and stability.

Based on the above characteristics of the telecentric lens, it has been widely used in character and LOGO detection. By using telecentric lenses, the inspection system can realize real-time, high-precision monitoring of products running on the conveyor belt. When the characters or logos on the product appear dirty spots, oil accumulation, hairline, less oil, scratches and other undesirable conditions, the system can quickly identify and trigger the alarm mechanism, and at the same time linkage rejection device to reject the defective products from the production line. This not only improves production efficiency, but also ensures the stability and consistency of product quality.