Abstract: A method for fabricating a blind via structure of a substrate is provided. First, a substrate is provided, which includes a conductive layer, a metal layer, and a dielectric layer disposed between the conductive layer and the metal layer. Next, a cover layer is formed on the conductive layer. Finally, the substrate formed with the cover layer is irradiated by a laser beam to form at least one blind via structure extending from the cover layer to the metal layer. The blind via structure includes a first opening, a second opening, and a third opening linking to one another. The first opening passes through the cover layer. The second opening passes through the conductive layer. The third opening passes through the dielectric layer. For example, a size of the first opening is greater than a size of the second opening and a size of the third opening.

Abstract: A method for fabricating a blind via structure of a substrate is provided. First, a substrate is provided, which includes a conductive layer, a metal layer, and a dielectric layer disposed between the conductive layer and the metal layer. Next, a cover layer is formed on the conductive layer. Finally, the substrate formed with the cover layer is irradiated by a laser beam to form at least one blind via structure extending from the cover layer to the metal layer. The blind via structure includes a first opening, a second opening, and a third opening linking to one another. The first opening passes through the cover layer. The second opening passes through the conductive layer. The third opening passes through the dielectric layer. For example, a size of the first opening is greater than a size of the second opening and a size of the third opening.

Abstract: A computer keyboard key switch including a bottom support board, a key base having a rubber cone, a membrane circuit retained between the bottom support board and the key base, a bridging device supporting plate supported on the key base around the rubber cone, and a key cap coupled to the bridging device supporting plate by a bridging device, wherein the bottom support board has two upright lugs inserted through parallel slots on the membrane circuit and the key base and defining a respective retaining hole; the bridging device supporting plate has two coupling tongues respectively forced into engagement with the retaining holes of the upright lugs of the bottom support board.

Abstract: A computer keyboard key switch which includes a bottom support board, a membrane circuit supported on the support board, a key base having a rubber cone and supported on the membrane circuit, a bridging device supporting board supported on the key base, a key cap, and a bridging device connected between the key cap and the bridge device supporting board and consisting of two rectangular open frames pivotally connected into a crossed form for permitting the key cap to be depressed to compress the rubber cone causing it to trigger the membrane circuit.

Abstract: A computer chip mounting hardware includes a mother board having two electrical connectors at the top; a sub PC board having two electrical connectors at the bottom respectively connected to the electrical connectors on the mother board and a center opening for heat dissipation; a computer chip electrically connected to the sub PC board at the bottom and suspended above the mother board for letting heat be dissipated through the center opening on the sub PC board and the space between the computer chip and the mother board; and a heat conductive clamp bridged over two opposite sides of the sub PC board and clamped on two opposite sides of the computer chip for dissipating heat from the computer chip.

Abstract: A computer key switch consisting of a key cap, a locating plate, a key body, a rubber cone, and a printed circuit board, wherein the key cap has two bottom rods movably inserted into two pin holes on the key body and two corresponding pin holes in the circuit board, two bottom hooks movably hooked in two retaining holes on the key cap and passable through two corresponding through holes in the circuit board, and a bottom plunger disposed in line with the center through hole on the key body and forced to squeeze the rubber cone; the key body protrudes over a hole on the locating plate, having an outward bottom flange retained between the locating plate and the printed circuit board and two opposite stop rods stopped against the locating plate at the top; the rubber cone is received within the key body and driven by the plunger of the key cap to electrically connect a circuit on the printed circuit board.

Abstract: A computer key switch consisting of a key cap, a key body, a rubber cone, and a printed circuit board, wherein the key cap has two bottom rods movably inserted into two pin holes on the key body and two corresponding pin holes in the circuit board, two bottom hooks movably hooked in two retaining holes on the key cap and passable through two corresponding through holes in the circuit board, and a bottom plunger disposed in line with the center through hole on the key body and forced to squeeze the rubber cone; the key body has two downward hooks on two opposite sides thereof respectively hooked in two retaining holes on the printed circuit board; the rubber cone is received within the key body, having an annular top flange extended out of the center through hole on the key body and stopped against the bottom plunger of the key cap, and a conductive rubber on the inside to electrically connect a circuit on the printed circuit board upon each down stroke of the bottom plunger.

Abstract: A computer a key switch device comprised of key cap, a key body plate and a rubber base plate, wherein the key body plate has a raised key body portion with a respective center hole and a pair of opposite pin holes and a pair of opposite retaining holes; the rubber base plate has a conical projection received within the raised key body portion, the conical projection having a horn-shaped bottom ring supported on a membrane, a top ring extended out of the center hole on the raised key body portion, a transverse division wall blocked between the top ring and the horn-shaped bottom ring, and a solid stub rod extended downwards from the transverse division wall at the center to trigger a circuit inside the membrane upon each down stroke of the key cap; the key cap has a plunger stopped against the top ring of the conical projection, two opposite bottom rods inserted into the pin holes on the raised key body portion, and two opposite hooks hooked in the retaining holes on the raised key body portion.

Abstract: A beeper holder includes a casing having two lugs and a hook on the back at different elevations; a back plate having two mounting flanges bilaterally and perpendicularly disposed near a top side thereof and turned about a pivot pin connected between the lugs on the casing, a projecting strip spaced between the mounting flanges, and a retaining hole near a bottom side thereof for receiving the hook on the casing; a clamping plate having two triangular mounting flanges bilaterally and perpendicularly disposed near a top side thereof and turned about the pivot pin between the mounting flanges of the back plate; and a substantially V-shaped spring plate having one end fastened to the projecting strip of the back plate and an opposite end stopped against the clamping plate causing the clamping plate clamped on the back plate.

Abstract: A hard disk drive case to be fastened in a disk drive slot in either a desk top computer or a vertical computer for holding a notebook hard disk drive and permitting it to be drawn in and out. The hard disk drive case includes a bottom case having a dust guard pivotably hooked by two extension hooks to block a front disk drive slot thereof, a top cover covering the bottom case, and a connector electrically controlled by a micro switch through one extension hook for connecting the connector of the hard disk drive to be inserted.

Abstract: A computer key switch comprised of a key cap, a key base and a rubber cone, wherein the key cap has two bottom walls movably inserted into two elongated chambers on the key base, two hooked strips movably inserted into two opposite openings on the key base for upstroke limit control, and a plunger inserted through a ring-shaped holder on the key base and forced to squeeze the rubber cone; the key base has a bottom flange and two opposite side blocks for positioning on a frame; the rubber cone has a horn-shaped bottom ring supported on a membrane, a top ring inserted into the ring-shaped holder, a transverse division wall blocked between the top ring and the horn-shaped bottom ring, and a solid stub rod extended downwards from the transverse division wall at the center to trigger a circuit inside the membrane upon each down stroke of the plunger.