Improving inspection accuracy

Paul Boughton

JUKI's RV-1 PWB inspection machine, which improves inspection accuracy and speed with both automatic optical inspection (AOI) and solder paste inspection (SPI) functions.

RV-1 inspects component mounting failures and solder printing failures to prevent defective printed wiring boards (PWBs) from going on the market. This machine is equipped with Clear Vision Capturing System to correctly detect a failure at high speeds even for high-density PWB, used in devices such as mobile terminal.

To inspect a PWB, the machine will compare the actual PWB image data with the data programmed in advance to determine whether the PWB is correctly produced or not.  It uses Clear Vision Capturing System as an illumination device for shooting a PWB, and is equipped with 270 mm large-diameter high-brightness white LED 3-ring light and coaxial light. These lights allow the machine to capture extremely clear images for any kind of items, so that the machine can drastically reduce false calls (erroneous decision of a good PWB as a defective) and time loss required for recheck. Additionally, a twin linear motor, high-speed data transmission of CMOS camera and image processing library enables high-speed image shooting at 0.14 sec/frame to increase the speed of inspection significantly.

3D images synthesised from images shot with the 'angle camera' can be displayed for a final visual check so that the operator can determine whether the PWB is correctly produced or not. Central Operation Control allows one operator to check inspection images from two or more production lines, in order to streamline the inspection process and prevent variability of judgments among each operator. As for programming, all you have to do is to paste a template created in advance, then the inspection data will be generated automatically; the operation will be easy even for beginners.

RV-1 is equipped not only with the AOI function, for inspecting the placement condition before and after the reflow, but also the SPI function for inspecting the PWB after solder printing. These functions are applicable to a variety of applications, and can flexibly correspond to changes of production line. Same operation method can be adopted for both functions, so that the programming and operators’ education can be performed effectively.

Due to recent trends in high and multi-functionality of smart devices such as smartphones, automotive Engine Control Units (ECU), medical devices and digital consumer electronics devices, the size of components have been reduced further, and density increased further.  In addition to the newly released RV-1 as well as JUKI’s also recently debuted RP-1, JUKI has recently released the RX-series high-speed compact modular mounter. These systems expand JUKI’s lineup of mounting devices, making it possible to meet our customers’ demands for high productivity, flexibility and high quality throughout the entire production line.
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