March, 2024 Continued from previous page


component body, preventing it from reaching the camera.


More Cameras MIRTEC has enhanced the optical system


of 3D AOI by increasing the number of main cameras. These additional cameras are installed at different angles from the existing ones. Together with multiple high-resolution cameras and multiple multi-pattern projectors, they have created the ART optical system. Current 3D AOI systems, whether based on


laser or moiré methods, have a fixed angle between the sensor that reads pattern data and the projector (or emitter, in the case of lasers) that generates the patterns. In some optical sys- tems where the positions of the camera and projector are reversed, and multiple cameras are installed for 3D pattern recognition, it might be thought that such issues are avoided. However, there is still a lim-


itation in these types of optical systems. Since there is only one projector, the camera-projector angle for acquiring patterns ulti- mately remains fixed. We need another fixed sensor capable of acquiring 3D data from different angles than the sensors in the existing optical system.


The ART of Inspection MIRTEC’s ART optical sys-


tem comprises a total of 75 MP sensors, with five 15 MP CoaXpress color cameras, and four digital blue moiré projectors. Among the five cameras, one is installed in the top-down direc- tion, and the remaining four are positioned at an angle facing the center. All five cameras serve as main cameras. While the four cameras


installed at an angle are tilted uniformly from the center, it might appear at first glance that there are only two angles of top down and side cameras for opti- cal data acquisition, but that is not the actual case. The reason for this lies in the fact that the projector, responsible for examin- ing the 3D patterns, is also com- posed of four angles. In 3D AOI systems with


multiple projectors, they do not operate simultaneously (as simultaneous operation would result in overlapping patterns and erasure). Instead, they oper- ate sequentially. In the ART system, one pro-


jector projects the patterned light, and this is simultaneously read by all five cameras. Therefore, the angles formed by each individual projector and camera are different, meaning 3D patterns through five distinct paths (angles) are observed from one projector. With four projectors in the


ART optical system, there are a total of 20 optical paths through which pattern data is acquired. The advantages of having a diver- sified optical data acquisition


ART, a new 3D AOI system from MIRTEC. Its name stands for “Anti-Reflection Technology.”


www.us - tech.com


Page 61 New Technology to Enable Flawless Solder Inspection


structure are as follows. During 3D inspections, if one camera fails to recognize the 3D measure- ment pattern investigated by the projector in a specific area due to issues such as light reflection or vanishing point on solder joints, conventional 3D AOI systems would likely fail to acquire 3D data in that region. The conventional 3D AOI systems would compensate for it using software algorithms for inspection. However, in the ART optical system, the


other four cameras also recognize the same pat- terned light. Therefore, it can compensate for the lost data and thoroughly inspect the solder joint. Contact: MIRTEC Corp., 3 Morse Road,


Oxford, CT 06478 % 203-881-5559 fax: 203- 881-3322 E-mail: bdamico@mindspring.com Web: www.mirtec.com r


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