The principle and physical models of novel jetting dispenser with giant magnetostrictive and a magnifier

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.

Design and Experiment of a Moving Magnet Actuator Based Jetting Dispenser

“…To reduce the design time, main geometric dimensions of the dispensing cluster including the ball-needle, chamber, and seat-nozzle follow previous studies and existing dispensers [11,20,25,26]. Figure 4a shows the dimension symbols for the dispensing cluster.…”

“…There are two main approaches in dispensing technology: Contact and non-contact dispensing. Non-contact/jetting dispensing has several advantages and has been used for investigations and applications [10][11][12][13][14][15][16].…”

“…Similar to the PSA, the elongation of the MSA is also limited by the small travel range. Thus, mechanical amplification is also used to amplify the needle displacement, as indicated in Figure 2c [11,19]. The size and cost of the PSA and MSA types also increase significantly when utilizing mechanical amplification, so they are more suitable for high-frequency applications.…”

Design and Simulation of Electromagnetic Linear Actuators for Jet Dispensers

“…For actuators with a long stroke length, the actuator drives the connecting mechanism directly, as shown in Figure 1a. However, if the shaft stroke of the actuator is less than the minimum stroke of the needle, a magnification mechanism consisting of a fulcrum and a lever arm is required to amplify the actuator stroke, as shown Current PSA, MSA, and EPA-based jet dispensers can typically reach operating frequencies of 1000, 250, and 280 Hz, respectively [29][30][31]. Moreover, EMA-based jet dispensers can also achieve driving frequencies greater than 200 Hz provided that they have a stroke length of less than 0.5 mm [32,33].…”

“…Current PSA, MSA, and EPA-based jet dispensers can typically reach operating frequencies of 1000, 250, and 280 Hz, respectively [29][30][31]. Moreover, EMA-based jet dispensers can also achieve driving frequencies greater than 200 Hz provided that they have a stroke length of less than 0.5 mm [32,33].…”