A single mask is used to form a tapered nozzle in a polymer nozzle member using laser ablation. In one embodiment of the mask, clear portions of the mask, corresponding to the nozzle pattern to be formed, each incorporate a variable-density dot pattern, where the opaque dots act to partially shield the...http://www.google.se/patents/US5417897?utm_source=gb-gplus-sharePatent US5417897 - Method for forming tapered inkjet nozzles
