Offline automatic aoi optical inspection equipment is the general name of AOI after reflow and AOI after wave soldering. It is the electrolytic capacitor polarity test function that automatically detects the placement of parts after the SMD parts are mounted on the surface mount PCBA production line or after soldering. The assembly state and soldering state detect PCBA soldering defects. In addition, various statistical data on production engineering are provided to correctly understand the cause and content of the defects, thereby improving production efficiency. aoi automatic optical detector _ a good helper to improve yield.
Automatic aoi optical testing equipment, also known as AOI optical tester, AOI automatic optical tester, aoi optical tester, is after the SMD parts are mounted on the surface mount PCBA production line, or after soldering, the electrolytic capacitor polarity test function automatically Detect the placement status and soldering status of parts, detect PCBA soldering defects, and provide a variety of statistical data on the production process, you can correctly understand the cause and content of defects, thereby improving production efficiency. aoi automatic optical detector _ a good helper to improve yield
With the reduction of the device package size and the increase of the chip density of the circuit board, the SMD inspection becomes more and more difficult, and manual visual inspection becomes inadequate. Its stability and reliability are difficult to meet the needs of production and quality control. It is more and more important for AOI inspectors to realize automatic detection. The first instrument used for production is an optical system. These instruments have a common feature in that the SMA reflected light is collected by a light source and processed by a computer image processing system to determine the position and welding of components on the SMA. For automatic optical inspection (AutomatedOpticalInspection, AOI for short) AOI optical inspection equipment is divided into two categories: online AOI automatic optical detector, offline aoi automatic optical detector.
AOI equipment is generally divided into three types according to the position on the assembly line: the first is AOI placed on the screen to detect solder paste failure, which is called AOI after screen printing; the second is to detect devices after placement AOI after placement failure is called AOI after placement; the third type is AOI after AOI after reflow and AOI after wave soldering are used to detect device placement and soldering failure at the same time. Testing Equipment.
The fault detection capability and principle of the above-mentioned offline automatic aoi optical detection equipment will be introduced below.
Offline automatic aoi optical inspection equipment is the general name of AOI after reflow and AOI after wave soldering
The AOI at this station can be used to detect various welding defects (including patch defects) after component welding. The test principle is that there is a relationship of WA = бlg (1 + cosθ) between the welding strength WA and the wetting angle θ between the solder / component pins, that is, the welding strength of the solder can be inferred from the state of solder wetting. The image captured by the camera is composed of many pixels, and each pixel has a certain gray value (0 to 255). Therefore, the image information processing through a certain mathematical model can accurately determine the welding quality. Can detect missing parts, offsets, skews, tombstones, side uprights, flipped parts, wrong parts, OCV, damage, reversed capacitor polarity, more tin, less tin, false soldering, continuous tin, copper foil pollution, etc.