Process Date: February 2003

Data Matrix code marking is especially well suited for glass, and has potential uses in a wide range of industries, including the automotive, construction, medical, and electronics industries. Synrad's laser marking software, WinMark Pro, features a Spot Marking Style that is useful for marking 2D bar codes on various glass types. The photo on the left shows a close-up of CRT monitor glass, marked with a 25W CO2 and FH Marking Head. The code was read using Acuity CI Matrix DMx Verifier + software; the box below lists the code's readability, text information, and other attributes.. 
The photo on the lower left shows three ways that Data Matrix codes can be laser marked on glass - the codes can be comprised of filled circles, spots, or raster-filled. WinMark Pro settings for the middle, "spot"-marked Data Matrix code were: two Mark Passes, 65% Power (a 25W laser was used), and a marking Velocity of 45 inches per second (IPS). Resolution was set to 50 DPI. The Spot Marking Style was set to "Yes" and Spot Mark Duration was set to 0.6ms. The accompanying text was marked using two passes with 25W at 20 IPS with a Resolution of 750 DPI. Spot Marking Style was turned off ("No"). 


WinMark Pro's Spot Marking Style was used to create this 0.35"sq 2D code on CRT glass.  The mark had a cycle time of 2.6 seconds.

Three  methods of marking glass using
WinMark Pro software:
Top: Circle Filled 
Middle: Spot Marking Style
Bottom: Raster Fill