Abstract:
A printed circuit board defective area transplant repair method in which printed circuit boards that are determined to be defective undergo a series of reworking procedures comprised of plotting the printed circuit board area block plan, selecting the printed circuit boards, cutting out the area blocks, cutting the selected area blocks, applying the adhesive and fitting area blocks, adjusting the area block alignment, roller tamping the plastic band, curing the adhesive, and tearing off the plastic band. Following the reworking operations, defective printed circuit boards are restored into a good products capable of continuous use such that printed circuit board fabrication and production is even more economical and environmentally protective and, furthermore, printed circuit board manufacturing reaches maximum utilization rates, thereby effectively increasing practical production value.
Abstract:
A printed wiring board device includes circuit parts which are mounted on a wiring board and constitute parts of a circuit in the printed wiring board device. Pads are provided on the wiring board in the circumference of the circuit parts, and the pads being electrically isolated from the circuit. Heat-absorbing dummy parts are mounted on the pads, and the dummy parts absorb heat from the circuit parts through the pads during reflow soldering.
Abstract:
The invention relates to a module component having chip components buried in a circuit board, and a method of manufacturing the same, and more specifically it relates to a module component capable of obtaining desired circuit characteristics and functions stably if the size of the component is reduced, being produced very efficiently, and suited to machine mounting, and a method of manufacturing the same. According to the invention, since a desired circuit is composed by disposing a specific number of chip components according to a specified rule, it is not necessary to heat the buried chip components at high temperature when forming a module, chip components are obtained in specified values, and the circuit characteristics, functions, and dimensional precision are stably obtained exactly as designed, and moreover since the chip components are disposed according to a specified rule, it is easy to automate insertion of chip components and increase its operation speed, even if the size of the chip components is reduced, and the circuit composition may be flexibly and easily changed only by changing the inserting position and type of chip components.
Abstract:
Methods for improved electronic substrate via and thru-hole filling, particularly through the use of drilled stand-offs formed by control-depth drilling oversized non-thru-holes and the use of inserted support pillars to prevent sagging of the substrate during filling. In particular, through the use of: (1) a via fill stand off adapted for use with a substrate comprising at least two via holes to be filled, each of the via holes having a diameter of X mils, the standoff comprising at least one recess formed by control-depth drilling of holes having a diameter at least 12X mils; and (2) a via fill standoff adapted for use with a substrate comprising at least one via hole to be filled, the standoff comprising: at least one recess; and at least one support pillar positioned within the recess wherein the support pillar is not an integral part of the standoff.
Abstract:
An electrical circuit includes a substrate having at least two alignment pads on the substrate that are accurately aligned with a first set of electrical interconnect pads, and also includes a corresponding number of alignment posts that are cylindrical and have flat bases that are geometrically similar to and smaller than a corresponding shape of each of the at least two alignment pads by a predetermined solder fillet radius. Each of the at least two alignment posts is reflow soldered to one of the at least two alignment pads. An electrical part can be accurately aligned to the substrate using the alignment posts, during attachment of the electrical part.
Abstract:
In manufacturing multilayer printed wiring boards with a cavity for mounting an electronic device, a rubber or composite rubber sheet is mounted in the cavity to prevent a prepreg resin from flowing into the cavity. The rubber sheet or composite rubber sheet is removed after applying pressure and temperature to an assembly consisting of boards to be bonded and the prepreg between them. This eliminates poor bonding which can result when resin flows into the cavity.
Abstract:
A wiring board includes a first insulating layer, a pad formed on one surface of the first insulating layer, a second insulating layer, formed on the one surface of the first insulating layer, and including an opening exposing the pad, and a reinforcing metal layer formed in contact with the first insulating layer, and provided around the pad so as to be separated from the pad in a plan view. The pad is disposed inside the opening without making contact with the second insulating layer. An end, on a side of the first insulating layer, in a portion of an inner side surface of the opening of the second insulating layer makes contact with the reinforcing metal layer, and an end in another portion of the inner side surface of the opening of the second insulating layer makes contact with the one surface of the first insulating layer.
Abstract:
A support is provided for fabrication of an electronic device. The support includes at least one component to be protected and at least one three-dimensional element of a height at least equal to a height of the electronic component. The three-dimensional element is disposed laterally opposite the at least one component to be protected. The three-dimensional element is chiefly constituted of a permanent assembling material.
Abstract:
A semiconductor substrate includes: (1) a first dielectric structure having a first surface and a second surface opposite the first surface; (2) a second dielectric structure having a third surface and a fourth surface opposite the third surface, wherein the fourth surface faces the first surface, the second dielectric structure defining a through hole extending from the third surface to the fourth surface, wherein a cavity is defined by the through hole and the first dielectric structure; (3) a first patterned conductive layer, disposed on the first surface of the first dielectric structure; and (4) a second patterned conductive layer, disposed on and contacting the second surface of the first dielectric structure and including at least one conductive trace, wherein the first dielectric structure defines at least one opening, and a periphery of the opening corresponds to a periphery of the through hole of the second dielectric structure.