Abstract:
A method for vertical removal of excess solder from a circuit substrate includes the use of a sacrificial circuit substrate (60) with a plurality of pads and vias that are solder-wettable. The pads and vias of the sacrificial circuit substrate are placed (64) in vertical proximity to the excess solder of the circuit substrate. The excess solder is heated (66) until it is liquid, wherein the excess solder is wicked (68) vertically onto the pads and into the vias of the sacrificial circuit substrate. Thereafter, the sacrificial circuit substrate is lifted (70) from the proximity of the circuit substrate while the solder is in a liquid, taking the excess solder with it but leaving a predetermined amount on the circuit substrate.
Abstract:
A module component in which chip parts are embedded in a circuit board and a method of manufacturing of the same. The module component can have desired circuit characteristics and functions stably even if the size of a part is miniaturized, is produced with high efficiency, and suitable for mechanical mounting. Since a desired circuit is formed by arranging a prescribed number of parts according to a prescribed rule, no heat treatment of embedded parts is required when making a module. Since each chip part has values conforming to the specifications, the circuit characteristic, functions and dimensional accuracy or the like can be stably obtained as designed. Since the chip parts are arranged according to the prescribed rule, insertion of the chip parts can be easily automated and speeded up, and miniaturization of the chip parts is coped with sufficiently. Moreover, the circuit structure can be changed flexibly and easily only by changing the insertion positions and types of chip parts.
Abstract:
We disclose a technique to generate stretched solder columns (bumps) at the wafer level, suitable for wafer level packaging. This is accomplished through use of using two wafers-the standard (functional) wafer that contains the integrated circuits and a master (dummy) wafer on whose surface is provided an array of solder bumps that is the mirror image of that on the functional wafer. After suitable alignment, both sets of solder bumps are melted and then slowly brought together till they merge. Then, as they cool, they are slowly pulled apart thereby stretching the merged solder columns. Once the latter have fully solidified, they are separated from the master wafer only.
Abstract:
In accordance with the invention, a plurality of high thermal conductivity bodies are bonded to relatively hot spots of a component-populated substrate surface to provide thermal conduction from the surface to an overlying thermal plane. The high conductivity bodies can be configured for pick-and-place application and self-aligned in solder bonding. Receiving solder pads on the substrate facilitate low thermal resistance solder bonding and self-alignment. In a preferred embodiment the bodies are rectangular parallelpipeds with bifurcated bonding surfaces.
Abstract:
An assembly (5) and method for extending the durability and life span of flexible circuitry by limiting the bend radius of the flexible circuitry and distributing the flexure point about an extended portion of the circuitry. An assembly (5) comprises one or more flex limiting members (10, 20, 30, 40) associated with and integrated between the layers of flexible circuitry laminate. A fastener (60) is affixed to the flexible circuitry laminate, operatively coupling the one or more flex-limiting members (10, 20, 30, 40) in position adjacent the flexible circuitry laminate. The flex-limiting member (10, 20, 30, 40) limits flexure of the circuitry, during each individual bend, to or below a predetermined angle, thereby decreasing the rate of failure in the circuitry, for example via short circuit, as a result of repeated or excessive bending.
Abstract:
Printed circuit board electronic assemblies (76) having improved thermal dissipation capabilities are obtained by adding electrically insulating but thermally conductive heat shunt components (80-85,90) to the circuit board (56) along with the regular electronic components (14-23). The heat shunt components (80-85,90) have a shape so that they may be placed on the printed circuit boards by the same assembly equipment used for the other electronic components (14-23). A typical heat shunt (80,90) component is a small parallelepiped of a highly thermally conducting electrically insulating dielectric (92), such as for example, alumina, beryllia, sapphire or aluminum nitride. It desirably has spaced-apart metal attachment lands (94,96) on one face (95) and an optional continuous metal layer (98) on the opposite face (97). In a typical application, one end (94) is soldered to the contact pad (66,68) where a power dissipating component (12) is also attached, and the other end (96) is soldered to a nearby ground lead (26′).
Abstract:
Printed circuit board electronic assemblies (76) having improved thermal dissipation capabilities are obtained by adding electrically insulating but thermally conductive heat shunt components (80-85,90) to the circuit board (56) along with the regular electronic components (14-23). The heat shunt components (80-85,90) have a shape so that they may be placed on the printed circuit boards by the same assembly equipment used for the other electronic components (14-23). A typical heat shunt (80,90) component is a small parallelepiped of a highly thermally conducting electrically insulating dielectric (92), such as for example, alumina, beryllia, sapphire or aluminum nitride. It desirably has spaced-apart metal attachment lands (94,96) on one face (95) and an optional continuous metal layer (98) on the opposite face (97). In a typical application, one end (94) is soldered to the contact pad (66,68) where a power dissipating component (12) is also attached, and the other end (96) is soldered to a nearby ground lead (26′).
Abstract:
The invention relates to a method of cooling electronic circuit boards using surface mounted devices (SMD), the method comprising the steps of: after or during the board layout, filling empty spaces V1, V2, V3, V4, V5, V6, V7, V8, V9, V10 with at a number of heat sink devices 1, 2, 3, 4, 5 near a thermal hot spot and connecting the number of heat sink devices 1, 2, 3, 4, 5 to a thermally conducting path 25, 27, 29, 31, 33, 35 of the board N, respectively. Further, the invention relates to a heat sink device 1, 2, 3, 4, 5 adapted to implement the method according to the invention.
Abstract:
A test board (115;115') is proposed for testing electronic devices (105;105'), each one of them having a plurality of terminals (220;220') for electrically contacting the electronic device. The test board includes a support substrate (205;205'). A set of banks of electrically conductive receptacles (210;210') are arranged on the substrate each one for resting a corresponding electronic device; each receptacle (250,255;250',255') is adapted to receive a terminal of the corresponding electronic device. Locking means (225) are further arranged on the substrate for mechanically locking the electronic devices on the test board. The test board further includes assembly means (230-245) for mounting the locking means on the substrate independently of the receptacles.