Abstract
In order to develop jetting technologies of glue in LED and microelectronics packaging, giant-magnetostrictive-material (GMM) is firstly applied to increase jetting response, and a new magnifying device including a lever and a flexible hinge is designed to improve jetting characteristics. Physical models of the jetting system are derived from the magnifying structure and working principle, which involves circuit model, electro-magneto-displacement model, dynamic model and fluid-solid coupling model. The system model is established by combining mathematical models with Matlab-Simulink. The effectiveness of the GMM-based dispenser is confirmed by simulation and experiments. The jetting frequency significantly increases to 250 Hz, and dynamic behaviors jetting needle are evaluated that the velocity and displacement of the jetting needle reaches to 320 mm•s-1 and 0.11 mm respectively. With the increasing of the filling pressure or the amplitude of the current, the dot size will become larger. The dot size and working frequency can be easily adjusted.
Highlights
In order to develop jetting technologies of glue in LED and microelectronics packaging, giantmagnetostrictive-material (GMM) is firstly applied to increase jetting response, and a new magnifying device including a lever and a flexible hinge is designed to improve jetting characteristics
Contact-based dispensing technique can be classified into three types: time-pressure, rotary-screw and positive displacement[6]
Pneumatic jetting dispensers depend on electromagnetic valves of high frequency
Summary
In order to develop jetting technologies of glue in LED and microelectronics packaging, giantmagnetostrictive-material (GMM) is firstly applied to increase jetting response, and a new magnifying device including a lever and a flexible hinge is designed to improve jetting characteristics. Contact-based dispensing technique can be classified into three types: time-pressure, rotary-screw and positive displacement[6]. In contact-based dispensing method, repeatability requires the same dispensing gap (the gap between the needle and the substrate or PCB) of each dot Maintaining such a constant dispensing gap needs a positioning system that can move the nozzle up and down accurately during the dispensing process. The electromagnetic valves have only a lifespan of few months and the price is high For these reasons, some experts engaged in PZT (Pb(ZrxTi1-x)O3—a kind of piezoelectric ceramic) driving dispenser research, and made great achievements[12,13]. This work was undertaken to examine a new type of dispenser based on GMM drive, and design the magnifying device to improve the dynamic behaviors. Complex models and superior performance of the new system are discussed
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