Hybrid microassembly combining laser die transfer and capillary self-alignment

Analysis of Forces during UV Glue Curing for Micro-Assembly Applications

“…For behavioral analysis, it is interesting to address the performance with these four steps (as shown in TABLE I). First one, the passive beam is allowed to bend up to the extent where the stiffness of the glue becomes equal to the stiffness of the passive beam, as defined in equation (1). Once the glue stiffness becomes higher than beam stiffness but less than the condition mentioned in equation (2), calculated from static equilibrium case, then there should be movement of beam (point A) but in opposite direction which is originated from the motion of point B.…”

“…The limitation in glue stiffness measurement for defined Step: 3 and Step: 4 can be seen, with maximum calculated stiffness shown in Figure (11). For the Case: 2 with rigid beam, from equation (1) and (2), with lim k b →∞ k g (and accordingly taking care of sign convention), then it can be said that glue stiffness can be measured up to the value of k f . In the proposed configuration, with the known stiffness around the glue, the glue curing behavior can be monitored and verified in terms of glue stiffness variation and the possible limitation in the measurement (as can be seen from Step: 3 and Step: 4).…”

“…Even with the availability of several micro-fabrication technologies, the robotized approach for precise micro-assembly is still a big need. In the recent years, there were several development in micro-assembly works, in context of different approaches such as using Laser die transfer technique [1], with microfluidic interconnection [2], and with Laser scanning confocal image alignment [3], whereas different strategies to handle complex task [4] and highly accurate assembly tasks [5]- [7] have also been demonstrated. For micro-assembly applications including MEMS devices, use of the glue is one of the widely used techniques in industries.…”

Laser-Assisted Mist Capillary Self-Alignment

“…Microscopic droplets in the form of water mist were introduced as the media for mist capillary self-alignment. Initial results of this work have been reported in a conference (MARSS 2017) [ 23 ]. In addition to the concept and experimental study, this paper reports detailed fabrication methods for the substrate, methods for estimating effective laser burning areas, analysis of the mist-alignment process, related critical volume and forces, and in-depth analysis of the experimental results.…”