Patent ID: 9377918
Filing Date: 2016-06-28
CPC Classification: B23K,B41M,G06F,H05K

Claim Text:
1. A method of forming patterns in coatings on opposite sides of a transparent substrate, the substrate having first and second faces on opposite sides thereof, by direct write laser patterning comprising the steps: a) providing a first transparent coating on the first side of the substrate, the first coating being formed of a material having a relatively high laser ablation threshold energy density; b) mounting the substrate on a stage or locating the substrate on a chuck, c) using a first laser beam to form a first pattern in the first transparent coating by laser ablation; d) providing a second transparent coating on the second side of the substrate after formation of said first pattern, the second coating being formed of a material having a relatively low laser ablation or modification threshold energy density; e) using a second laser beam to form a second pattern in the second transparent coating by laser ablation or modification, the energy density of the second laser beam being lower than that of the first laser beam such that ablation of the second transparent coating is carried out without causing appreciable damage to the first transparent coating.