Micro needle arrays have been widely used within medical contexts, such as for drug delivery and nervous electrodes, and its fabrication methods have attracted attention recently. This paper describes a novel fabrication method for micro needle arrays on a tungsten metal plate using only laser beam machining. Tungsten material was ablated as combining laser beam scanning path to control needle structure. Overlapping laser beams from the combined scanning path causes thermal accumulation phenomena which removes the material. In this paper, controlling laser scanning path (Line Interval, Line Space, Number of Lines) and machining conditions (Power, Number of Scan), and the changing length and pitch of the micro needles were measured through SEM. Moreover, the piercing force for application in drug delivery and nervous electrodes was measured with a load cell system.

In laser polishing, a laser beam is used to melt the surface of a work piece to improve surface quality. An optimum combination of process controlling parameters and state of laser beam output is the key strength of laser polishing. Laser beam output power, feed rate, path interval, and spot size are critical parameters in the laser polishing process effect on the thermal state of surface quality. In this study, experimental tests demonstrate that it is an optimum value of the proper processes condition in the pulse laser and CW laser system. The proposed dominant controlling parameters, method for examining morphology; several experimental conditions; and details from performance improvement of surface roughness are presented.