Examination for automatic optics

With an examination for automatic optics (Automated Optical Inspection, AOI), it is an examination for automatic appearance in the production of a printed circuit board (PCB) and the liquid crystal display. Autonomy scans a device with a camera and inspects a serious defect (e.g., parts lack) and quality defect (e.g., the skewness of size, a shape and the parts of the fillet). Because it is a test method of the non-contact / nondestructiveness, I am generally used in much PCB process of manufacture and I reflow base-up board (nude board) inspection, solder paste inspection (Solder Paste Inspection, SPI) and am mixed up (pre-reflow and post-reflow AOI) and am introduced.

Table of contents

I surface mount it (SMT) and inspect it and it

In AOI of the surface mounted printed circuit board, I can inspect the following defects:

• Aspect defect (Area defects)
• Billboarding
• Component offset
• Component polarity
• Component presence or absence
• Torsion / skewness (Component Skew) of parts
• Excessive Solder Joints
• Flipped component
• Height Defects
• Insufficient Paste around Leads
• Lack of solder thin / solder (Insufficient Solder Joints)
• Lifted Leads
• No Population tests
• Paste Registration
• Severely Damaged Components
• Solder bridge / shortstop (Solder Bridges)
• Tombstone / chip stands; (Tombstoning)
• Volume defect (Volume Defects)
• Wrong Part

Base-up board (Bare PCB) inspection

• Circuit width (Line width violation)
• A circuit interval (Spacing violation)
• Excess copper
• There is no missing pad / pad (Missing pad)
• Circuit shortstop (Shorts circuits)
• Cuts
• Running out of seat sharpness / hole gap / land (Hole breakage/Land breakout) – The state that a drill hole (beer) protruded from a land (pad).
• Parts mistake

The trigger of the defect report is available for setting on the basis of inspection algorithm (model checking) or CAD.

It is said that this inspection method is much superior to an examination for hand-operated appearance in reliability, plasticity. ^{[The source required]}

In many cases, I push up demand for AOI and ICT for the design of a more minute (narrow pace) circuit board. ^{[The source required]}

Allied technical

In an inspection technology in conjunction with AOI, it is commonly used technique for the inspection of the electronic circuit board in the electronics production industry as follows. : ^[1]

• AXI (Automated x-ray inspection/ automatic X-ray check)
• A boundary scan test and popular name of standard IEEE 1149.1 of the test access port which are usable for inspection, the debugging of JTAG (Joint Test Action Group) ... integrated circuit and the board
• ICT (In-circuit test (インサーキットテスタ))
• Function test (Functional testing)

Reference

1. ^ Zentroid - PCB/CAD/AOI Basics, Component and Package names

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