Abstract:
A ball grid array device includes a substrate, further including a first major surface and a second major surface. An array of pads is positioned on one of the first major surface or the second major surface. At least some of the pads include a raised ring. The raised ring circumscribes the pad or surrounds an interior pad or land on the substrate.
Abstract:
A light-emitting diode light source unit has a printed circuit board mounting a light-emitting diode (LED) element on its surface. Between the LED element surface-mounted on the printed circuit board and a wiring land formed on the printed circuit board, there is surface-mounted a reflector for directing a beam emitted from the LED element toward an object to be illuminated, and the LED element and the wiring land are connected via a bonding wire.
Abstract:
A light source unit includes a substrate mounting a plurality of light emitting diodes (LED's) for irradiating beam to an object. The substrate is formed of a material having high heat conductivity and the unit includes a chip resistor mounted on the substrate and heat generation controller for heating the substrate with heat generated in the chip resistor upon supply of power to the chip resistor. The plural LED's are arranged in the form of an array on the substrate and a plurality of the chip resistors are arranged linearly along the array of LED's.
Abstract:
A rigid-flex circuit board system that can be manufactured using less expensive and more reliable rigid circuit board methods and equipment, and can maintain rigidity and dimensional stability until the time when it is first desired to flex.
Abstract:
A center bond flip chip device carrier and a method for making and using it are described. The method includes forming a seat with a cut out portion in at least one trace on a substrate and providing an elastomeric material over the substrate. The seat is sized and configured to receive a conductive connecting structure. The elastomeric material has a gap at the seat to allow electrical connection of the conductive connecting structure with a semiconductor die.
Abstract:
A printed circuit board unit comprising a printed circuit board and a correction member. The correction member contacts the printed circuit board at a pair of contact points and support points arranged between the contact points. The support points are defined at a position withdrawing from a plane including the contact points. Screws serve to urge the printed circuit board against the correction member. The correction member is adapted to generate an intentional warp or bend. Such warp serves to correct or modify the curvature of the front surface of the printed circuit board. The front surface of the printed circuit board can be maintained flat.
Abstract:
A semiconductor integrated circuit device and a printed wired board which self-align to each other in an exact and precise manner. The semiconductor integrated circuit device has conductive bumps. The printed wired board has conductive recessed members at positions corresponding to the conductive bumps. Each of the conductive bumps is fitted into the corresponding conductive recessed member so that the printed wired board is aligned with the semiconductor integrated circuit device.
Abstract:
A land grid array semiconductor device provides greater positioning accuracy for an external electrode with respect to a mounting substrate. External electrodes are arranged on one surface of a substrate in area array. The external electrode includes an external electrode pad and an external electrode interconnection. Each external electrode pad includes a first pad layer having a cylindrical shape and a second pad layer covering the surface of the first pad layer and having a conical shape.
Abstract:
A multi-layer electronic circuit board design 10 having selectively formed apertures or cavities 26 which have improved solder-wetting characteristics by causing a first insulating layer to separate from a portion of a first conductive layer of the multi-layer electronic circuit board 10 which allows for communication by and between some or all of the various component containing surfaces, and portions of the formed multi-layer electrical circuit board 10, which selectively allows components contained within and/or upon these portions and surfaces to be interconnected.
Abstract:
A method and structure to electrically and mechanically join a first a first electrically conductive pad on a first substrate to a second electrically conductive pad on a second substrate using a solder joint that includes a low-melt solder alloy composition. The second electrically conductive pad has a geometry that compels a gap size of a gap between the first substrate and the second substrate to exceed a distance between the first substrate and a surface of the second pad.