FLUID COOLED CONTACT MASK

摘要

A mask (17) for use in forming features in a surface (12) by high energy pulses of laser radiation is disclosed which comprises a base plate (19) which is located adjacent said surface and has apertures (20) in it through which locations of said surface are exposed to the laser radiation. Channel means (21) formed in a cover (23) of the mask lie in adjoining regions of the mask exposed to the radiation and during ablation of said surface having cooling fluid circulated through there. The mask is described in use for making nozzles (25) in the nozzle plate (13) of an ink jet printhead.