12 March 2003Manufacturing / Production Technology, Hardware & Services
Metcal's innovative VPI-1000 optical inspection system adds features and flexibility to traditional optical inspection while offering customers an economical inspection solution. According to the company, the VPI-1000 gets tighter, closer and lower than any other optical system, most of which require at least a 0,05 mm standoff height to view underneath the component.
Sleek and ergonomically designed, the VPI-1000 optical inspection system offers an on-screen magnification range of 5X to 245X and can easily inspect under components with a standoff as low as (0,05 mm). A specially designed optical tip requires just a 1,1 mm distance between components to achieve optimum inspection.
Unique to the VPI-1000 optical inspection system is the mirrored tip/lens interface. With this exclusive Metcal design, operators can look under BGA, CSP, LGA, etc, packages in spite of low standoff heights. Metcal says that this capability is ideal for mobile phone production and medical devices as both markets are focused on smaller and smaller tolerances, less available board real estate and lower profiles. The special tips are disposable and cost less to replace than other inspection systems, says the company. Moreover, they are more resilient and less brittle than traditional tips, and with proper use offer a longer lifespan, it adds.
Central to the system's capabilities is Metcal's articulating lens, which rotates 90° (left/right) for easier inspection of interior rows and features an angle swing of 5° (up/down) for closer inspection of top and bottom connections. With a slight turn of the lens adjustment ring, the operator can move through the underside of the component to check for bridging, cold solder joints, open circuits, excess flux, contamination and other process-related failures that X-ray inspection systems cannot easily detect without highly educated and technical interpretation.
The optical inspection system uses bright-white metal halide light that floods the underside of the component. This replicates natural daylight, enhancing colour rendering and produces clear, crisp images on the system's monitor. Completing the system is the CCD camera, which accounts for the system's compact size and a high-resolution flat LCD monitor that frees bench space. An optional software package includes measurement and process analysis, multi-focusing and image enhancement and a specially-designed visual defect diagnostic program.
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