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A Foldable 3-DOF Parallel Mechanism With Application to a Flat-Panel TV Mounting Device
Jaeheon Chung,Byung-Ju Yi,Sung Oh IEEE 2009 IEEE transactions on robotics Vol.25 No.5
<P>This paper deals with a new 3-degree-of-freedom (DOF) parallel mechanism for a flat-panel TV mounting device with two rotations and one translation. The most important operational requirements of this device are that it should support the heavy weight of the flat-panel TV and should be foldable to save space between the flat panel and the wall. An asymmetric parallel structure that has three kinematic chains with internal four-bar linkage is proposed to meet such requirements. Kinematic modeling was performed along with actuator sizing. Finally, the mechanism was developed and tested to show its effectiveness as a flat-panel TV mounting device.</P>
Characteristics of Movable Diaphragm of Silicon Micromachined Fabry-Perot Cavity Interferometer
Jaeheon Han,Seungjin Yoo 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
Deflection behavior of silicon micromachined Fabry-Perot cavity interferometers have been studied and the fabricated devices are classified into three categories depending upon the shape and the location of the deflecting and sealed diaphragm. These are the planar bottom diaphragm, the planar top diaphragm, and the corrugated top diaphragm Fabry-Perot interferometers. The composite dielectric layers of the diaphragms have been optimized for proper mechanical stability and output optical response. Fabrication complexity and device characteristics have been compared to one another. Planar bottom diaphragm interferometers are the easiest to build, but their device characteristics are limited severely. On the other hand, corrugated top diaphragm interferometers are the most complicated to build, but performed best. This distinction can be explained by demonstrating two parasitic phenomena. These are the signal averaging effect and the zero pressure offset effect. Both phenomena are due to the non-planar bending behavior of a diaphragm. The existence and influence of these parasitic effects have been observed by real-time measurement of the diaphragm deflection.