Microscope News

PCB Inspection: Microscope vs. Telecentric Lens

 

Automated optical inspection (AOI) is a key element in the inspection of PCB boards. Each year the measured parameters on the boards get smaller.The most popular optical inspection tools in the production line are the Telecentric Lens known mainly for their large working distance and the long depth of field. However, these two main features pose a limit to the higher resolutions required.

Omek Optics has introduced the PCB Inspection Microscope (Mic401E.80) to bridge the gap between conventional digital microscopy and the current widely used telecentric lenses equipped with digital sensors. The Mic401E.80 tube is mated to long working distance (WD) telecentric objectives to reach overall magnifications between x8 and x0.8. Figure 1 demonstrates how the Mic401E.80 provides better resolutions at magnifications overlapping those provided by standard telecentric lens. The graph also illustrates how the Mic401E.80 can reach higher magnifications at superior resolutions.

 

Figure 1: Extending resolutions in PCB inspection using Omek Mic401E.80 tube.

PCB Inspection Microscope

 

Additional advantages of the PCB Inspection Microscope:

  • The Mic401E.80 is equipped with Bright Field Kohler Illumination. This Telecentric Illumination is mandatory for Metrology applications of the PCB Boards.
  • A revolver (Turret) options allows automatic swap between various magnifications.
  • Two forms of Bright Field Illuminations are available. The Mic401ET.80 is equipped with Upright illumination supporting CCD and CMOS sensors with up to 1.0 Inch Formats.

 

 

 

Mic401ET.80 

PCB Inspection Microscope