Laminated-structure-processing method - determining laser beam wavelength from coefft. of absorption of layers

摘要

Laminated structures are processed such as film strip, supporting cards etc, and having layers with different coefficients of absorption for a laser beam forming letters, numbers etc. The beam wavelength is determined by the coeffts. of absorption of the layers to be processed. Where the film strip comprises a blank translucent supporting layer for visible light and a supporting layer for a colour pigment, the wavelength can be between 250 and 400 nm.