Automatic Visual Inspection Machine

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Automatic Visual Inspection Machine
Automatic Visual Inspection Machine
  • Title: Automatic Visual Inspection Machine
  • Category: Manufacturing
  • Description: Due to the increasing complexity of assembled printed circuit boards (PCB) and the demand by end users for fully inspected boards there is now an increasing requirement...

Automatic Visual Inspection Machine

Due to the increasing complexity of assembled printed circuit boards (PCB) and the demand by end users for fully inspected boards there is now an increasing requirement for automatic optical inspection on assembled boards. Visual inspection of PCB production lines consists of two parts:

  1. Solder Paste Inspection (SPI), which is a key inspection equipment to control the solder paste printing quality in SMT. SPI can inspect the solder paste, such as volume, area, height, XY offset, shape, bridge, etc. on PCB.
  2. Post-production automated optical inspection (AOI), which is an automated visual inspection of printed circuit board (PCB), LCD, or transistor manufacturing, where a camera autonomously scans the device under test for both catastrophic failure (e.g. missing component) and quality defects (e.g. fillet size or shape or component skew) comparing to an original previously scanned board.

Key Features 1

SPI detects these defects:

  • Spacing violation
  • Line width violations
  • Excess copper
  • Missing pad
  • Short circuits
  • Gold finger damage
  • Cuts
  • Hole breakage
  • Incorrect mounting components identified

Key Features 2

AOI detects these defects:

  • Area defects
  • Component offset, polarity, presence or absence and Skew
  • Excessive solder joints
  • Height defects
  • Insufficient paste around leads
  • Insufficient solder joints
  • Lifted leads
  • No population tests
  • Paste registration
  • Severely damaged components
  • Tombstoning
  • Volume defects
  • Incorrect part
  • Solder bridging
  • Presence of foreign material on the board

Technology: Scanning module

  • High resolution camera
  • Scattered illumination
  • 2 DOF Cartesian scanning mechanism

Technology: Software module

  • State-of-the-art defect detection algorithms
  • User control on size and number of defects
  • Excel, Text and HTML reporting