|
Process Date: June 2002 Created using a Synrad 10 W laser, FH Series marking head, and a 125 mm lens, the remarkably small 0.7 mm high text on the 4 mm x 5 mm electronic chip shown on the left can be read with the naked eye! The contrasting marks were created using 2 W of power at a mark velocity of 21 inches per second in a cycle time of 0.1 seconds.
Typically the smallest text character that can be marked by a given lens is three times the spot size. For a 125 mm FH focusing lens with a spot size of 0.18 mm (0.007”), the smallest possible text object would be approximately 0.54 mm or 0.021”. Especially at small character sizes, readable text is also a product of choosing the correct mark velocity, object delays, fonts, and extra character spacing. The readability of this particular application is enhanced by a process called “tip writing” where the material’s marking threshold, laser power, and mark velocity combine to produce a mark using the very tip of the Gaussian beam. Tip writing allows very small, readable text to be formed with enough detail so that each letterform shape is correctly marked. Notice the detail in the “1” characters and how the center areas of “A” and “B” characters are open and not filled as would occur if the entire laser spot was used.
Incredibly small readable text created with Synrad 10W laser!
|
