Appendix B: Lighting Guide
17
Appendix B: Lighting Guide
Table B-1: Lighting Guide
Application
Lighting Method
Light Type*
Cognex Part
Number
Notes
Good quality
code on a label
Front Lighting
Ring Light
CLM-4326
Almost any light will be
sufficient for this application.
Ink-jet code on
a reflective
metal surface
On-axis Diffuse
On-axis
Light
CLM-2449
The on-axis illumination
prevents bright spots in the
image.
Code on a
curved metal
surface
Even Illumination
Dome Light
CLM-7248
Provides very even diffused
illumination, preventing light
stripes in the image.
Laser-etched
codes
Low-angle
Illumination
Dark Field Light
Spot Light
CLM-1660
CLM-2420
The spotlight can be used
where there is limited space
for lighting.
Dot-peen code
(holes punched
into metal
surface).
Low-angle
Illumination
Dark Field Light
CLM-1660
Low angle lighting ensures
the holes are very dark
compared to the surface.
*See
Cognex Light Modules
datasheet (P/N 7513-00) for more information.
