Four-rotation detection platform for automatic optical detection system

Abstract

The invention relates to a four-rotation detection platform. The four-rotation detection platform comprises a detecting platform (1), a static platform (0), four UPS branches of identical structure and a middle branch, wherein the middle branch is located at the dead center of the detecting platform (1) and the static platform (0), one end of a link I (2) of the middle branch is fixedly connected with the static platform (0), the other end of the link I (2) is connected with a ball pair I (S5), and the ball pair I (S5) is connected with the detecting platform (1); the four UPS branches are all located at four top ends of the static platform (0), one end of each branch is connected with the static platform (0) through a Hooke hinge (U11), each Hooke hinge (U11) is connected with a moving pair I (P12) through a link II (3), each moving pair I (P12) is connected with a ball pair II (S13) through a link III (4), and each ball pair II (S13) is connected with the detecting platform (1); the moving pairs of the four UPS branches are driving pairs. According to the four-rotation detection platform, the rotational degree of freedom for the detecting platform (1) along two central axes of symmetry and two diagonal axes of the detecting platform (1) can be achieved separately, so that the four-rotation detection platform is adaptable to meeting the requirements of an automatic visual detection system on gesture adjustment.

Description

technical field [0001] The invention relates to a four-turn inspection platform for an automatic optical inspection system. Background technique [0002] The surface defect detection method based on automatic optical detection technology is an automatic and high-performance detection method because it does not require or requires less manual intervention. Apply gradually. The quality of the image collected by the image acquisition module in the automatic optical inspection system will not only affect the difficulty of subsequent image processing and analysis, but even determine the success or failure of the entire machine recognition task. [0003] Most of the existing automatic visual inspection systems use unidirectional static imaging, which cannot effectively detect defects under low-resolution conditions due to poor angle projection of the light source or poor placement of the display panel. With the research and development of surface defect detection technology, it ...

AI Technical Summary

Problems solved by technology

In 2015, Shi Yanqiong selected 3 sets of high-resolution cameras arranged at 3 different angles in the design of the optical detection system for surface defects of LCD backlight modules, and the imaging angle was limited and the cost was high; patent 201310071403.0 proposed the use of 3 cameras Arranged at 90°, 60°, and 30° respectively, and two design schemes using one camera and a rotary stage, but no specific structural design scheme for the rotary stage is proposed; patent 201420103362.9 proposes a The single-degree-of-freedom angle-adjustable support plate allows inspectors to observe the backlight module from different angles, and its single-axis adjustment characteristics do not conform to the motion characteristics of visual inspection; patent 201220570304.8 proposes a 4-degree-of-freedom adjustment platform, which can realize The movement of the detected part in two directions and the rotation around two fixed axes are manually controlled; in 2015, Zhang Yudong et al. designed a 5-DOF serial robot to adjust the position and attitude of the camera to obtain a clear image , complex structure and high cost

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