Abstract:
A fabrication method and structure for a PCBA, and tool for assembly of the structure. The structure includes a circuit board, at least one first solder joint, a plurality of second solder joints, and an electronic device. The circuit board has a solder mask, having a plurality of openings exposing at least one first pad and a plurality of second pads arranged beyond the first pad, on a surface. The first solder joint has a maximum width J1 and electrically connects to the first pad. The second solder joints respectively have a maximum width J2 exceeding J1 and respectively electrically connect to the second pads. The electronic device has a plurality of third pads, arranged substantially corresponding to the openings, respectively electrically connecting to the first pad and second pads.
Abstract:
A method of fabricating an electrical connecting structure of a circuit board is disclosed. The method includes: providing a circuit board having a plurality of first and a plurality of second conductive pads; forming on the circuit board a solder mask having a plurality of openings to thereby expose the first and the second conductive pads; forming an metal adhesive layer on the first and the second conductive pads; forming a conductive layer on the circuit board and the metal adhesive layer; forming on the conductive layer a resistive layer, wherein a plurality of openings are formed in the resistive layer to expose the conductive layer on the second conductive pads; forming a metal post by electroplating through the conductive layer on the second conductive pads; removing the resistive layer and the conductive layer covered underneath; and forming a soldering layer on the metal post. This invention discloses a method of forming different connecting elements on a circuit board.
Abstract:
In a printed board having a wiring pattern and an NSMD type land, the present invention prevents disconnection between the land and the wiring pattern and separation of the land from the printed board. The printed circuit board has a main wiring pattern, a protective film covering the main wiring pattern and having an opening formed therein, and a land located inside of the opening of the protective film so that the land is spaced from a circumferential edge of the opening of the protective film. The printed circuit board also has an auxiliary wiring pattern including a first auxiliary wiring portion located under the protective film so as to surround the land and second auxiliary wiring portions radially extending from the land to the first auxiliary wiring portion.
Abstract:
A printed-wiring board having a multiplayer structure including a plurality of insulating layers and a plurality of conducting layers includes a signal pattern provided in at least one of outermost layers of the conducting layers which includes a plurality of pad portions which are provided in positions opposite to a plurality of signal terminals of a connector component arranged in a predetermined form and perform electrical connection, reinforcing portions which are provided to extend from the pad portions respectively in a lengthwise direction, and land portions to perform the electrical connection to another layer of the conducting layers, and a solder resist provided on the outermost layer of the conducting layers to cover the reinforcing portion and having an opening portion to expose the pad portion.
Abstract:
According to one embodiment, a printed circuit board includes an insulating substrate, a plurality of lands formed on the insulating substrate, a conductive wiring pattern coupled to the lands, a protective film covering the insulating substrate and having an opening larger than the outer profile of each of the lands, a plurality of bumps bonded to the lands and a circuit component electrically connected to the lands via the bumps. Each land has a land body having a gap along an opening rim of the opening, and an extension part extending from a part of the land body to the opening rim of the opening.
Abstract:
A wiring board used for mounting an LED bare chip capable of firmly bonding the LED bare chip and improving yield. In a printed wiring board 2, a distance D between wiring patterns 81 and 85 disposed so as to oppose each other is the smallest at a position nearest to a center point (G) of an LED chip 14 disposed at a designed location, and increases with an increasing distance from the point G. In addition, pattern edges 83 and 87 of the wiring patterns 81 and 85 recede in the direction of widening the distance D as a distance from the center point G increases with respect to electrode edges 148 and 149 of the LED chip 14.
Abstract:
In a circuit board including a pad for mounting a ball grid array and a wiring, a mounting structure of the ball grid array, an electro-optic device, and an electronic device, the circuit board includes a pad for mounting the ball grid array, a wiring for connecting the pad and an external terminal, and a soldering resist having an opening portion exposing the pad and the wiring.
Abstract:
A solder resist and a central pad to which a central Au bump provided on a semiconductor chip is flip-chip bonded are formed on a substrate main body. In a flip-chip mounting substrate where an underfill resin is provided after the semiconductor chip is mounted, a central opening portion for exposing the central pad is formed in the solder resist, and also, an edge portion forming the outer peripheral portion of the solder resist is partially overlapped with the outer peripheral portion of the central pad.
Abstract:
A flexible printed circuit board has an insulation layer, a first signal wiring layer including a microstrip line, a second signal wiring layer including a signal connection terminal for allowing the microstrip line to connect the exterior connector electrically, and a ground conductive section having a ground connection terminal for connecting the exterior connector. The microstrip line and the signal connection terminal are connected to each other by a wiring via hole. The wiring via hole passes through the insulation layer, the first signal wiring layer, and the second signal wiring layer. The microstrip line has a taper section which gradually enlarges a width of the microstrip line toward the wiring via hole in the vicinity of the wiring via hole. The ground conductive section that corresponds to the microstrip line has a taper section with a shape matching the taper section of the microstrip line.
Abstract:
A design rule for a printed wiring board is provided. A conductive layer and a pad are separate from each other in a distance defined by the design rule, which sufficiently prevents the capacitance coupling between the conductive layer and the pad.