Abstract: A support stand for a flat-panel display monitor includes a mounting base, a connecting base, and two link shafts. Each link shaft has a first end rotatably connected to the mounting base and a second end rotatably connected to the connecting base. The support stand further includes a restricting pole fixed to the mounting base and positioned between the two link shafts, the restricting pole abuts against the two link shafts, thus restricting a rotary range of the two link shafts.

Abstract: A hinge assembly includes a first connecting member, a second connecting member, and a pivot subassembly. The pivot subassembly connects the first connecting member to the second connecting member. The pivot subassembly includes a rotatable shaft, a sleeve, and a positioning ring. The rotatable shaft is non-rotatably connected to the first connecting member. The sleeve is sleeved on the rotatable shaft, and non-rotatably connected to the rotatable shaft. The positioning ring is non-rotatably connected to the second connecting member. The sleeve defines two positioning cutouts, and the positioning ring defines two positioning protrusions engaging with the positioning cutouts. When the rotatable shaft rotates, one of the sleeve and the positioning ring deforms, so that the at least one positioning protrusion disengages from the at least one positioning cutout.

Abstract: A hinge assembly includes a rotatable shaft, a fixed stand and a cam rotatably connected to the rotatable shaft, a rotatable stand and a cam follower non-rotatably connected to the rotatable shaft, and an elastic member to provide an elastic force to drive the cam follower to contact the cam. One of the cam and cam follower forms a positioning protrusion, the other of the cam and cam follower defines a positioning groove to engage with the positioning protrusion. The positioning groove has a side wall including a first slanted surface and a second slanted surface connected to each other, the second slanted surface is adjacent to a bottom surface of the positioning groove. A gradient of the first slanted surface relative to the bottom surface of the positioning groove is smaller than that of the second slanted surface relative to the bottom surface of the positioning groove.

Abstract: A support stand for a flat-panel display monitor includes a mounting base, a connecting base, and two link shafts. Each link shaft has a first end rotatably connected to the mounting base and a second end rotatably connected to the connecting base. The support stand further includes a restricting pole fixed to the mounting base and positioned between the two link shafts, the restricting pole abuts against the two link shafts, thus restricting a rotary range of the two link shafts.

Abstract: A support stand includes a base, a supporting bracket, a first hinge assembly positioned between the base and the bracket, a second hinge assembly, and a third hinge assembly. The second hinge assembly and the third hinge assembly are positioned between the supporting bracket and a display body of the electronic device. The second hinge assembly includes a connecting bracket. The third hinge assembly includes a pivot shaft and a sleeve member. The sleeve member includes a leaf and a sleeve extending from an end of the leaf. The pivot shaft is firmly engaged in the sleeve of the sleeve member.

Abstract: A hinge assembly includes a first connecting member, a second connecting member, a third connecting member, and a fourth connecting member. One end of the second connecting member is slidably connected to the first connecting member and the other end is rotatably connected to the fourth connecting member. The second connecting member is rotatably connected to the third connecting member. One end of the third connecting member is slidably connected to the fourth connecting member and the other end rotatably connected to the first connecting member.

Abstract: The present invention discloses the doping of rare earth elements into porous silicon, resulting in enhancement of luminescence. The doping is an electro-chemical process using constant voltage bias across the two electrodes in which the anode is porous silicon and the cathode is platinum. The doping process involves a well-defined solution of electrolytes that controls the conductivity of the solution, and set values of constant voltages that selectively allow the desired rare earth elements being doped into porous silicon.