Abstract:
Low dielectric absorption component connection points are created on a printed circuit board by cutting apertures in the board surrounding the points, leaving only narrow stems still connecting the resulting island to the board.
Abstract:
Electrical interconnection structures are described. The electrical interconnection structures are formed by electrically interconnecting in a stack a plurality of discrete substrates. By using a plurality of discrete substrates, a multilayer dielectric/electrical conductor structure can be fabricated from individual discrete substrates each of which can be tested prior to forming a composite stack so that defects in each discrete substrate can be eliminated before inclusion into the stack. Electrical interconnection between adjacent substrate is provided by an array of contact locations on each surface of the adjacent substrates. Corresponding contacts on adjacent substrates are adapted for mutual electrical engagement. Adjacent contact locations can be thermocompression bonded. To reduce the parasitic capacitance and coupled noise between the contact pads and the electrical conductors within the interior of each discrete substrate, the contact pads on each substrate have elongated shape. The elongated contact pads or lattice pads on adjacent substrates are nonparallel and preferably orthogonal so that the corresponding pads of adjacent substrates electrically interconnect an intersecting area which varies in location along the elongated contact pads as the placement of the adjacent substrates varies in the manufacture.
Abstract:
A surge protector or transient suppressors for AC power lines having its components mounted on a circuit board. The metalization of the board are configured to present as large a surface area as possible, given the topology of the board, to the flow of current. A return conductor is placed on the opposite side of the board with a large surface area corresponding to the first conductor. The magnetic field between the two conductors is substantially cancelled. This configuration reduces the magnetic field intensities associated with the flow of current, thereby reducing self-inductance.
Abstract:
An acoustic surface wave filter element provided with two input and two output pins connected with the input and the output interdigital electrodes, respectively and an earth pin connected with a filter element shield casing is disposed on one surface of a circuit board, with the five pins extending through corresponding through holes in the circuit board to the other surface of the circuit board on which the pins are connected with corresponding conductive circuit patterns of the circuit board. The circuit patterns include a first signal pattern to be connected with one of the input pins, a first earth pattern connected with the other of the input pins, a second and a third signal pattern connected with one and another of the output pins, and a second earth pattern connected with the earth pin of the filter element. The first and the second signal pattern have end portions opposedly positioned to each other, and an earth pattern portion is positioned between the opposed end portions of the first and the second signal pattern to connect the first and the second earth pattern with each other. Portions of the patterns positioned beneath the filter element are arrayed symmetrically about an axis lying on the center of the terminal of the end portion of the first signal pattern and external between the second and third signal patterns.
Abstract:
Provided is a power converter which is applied to a power converter equipped with a switching element provided on a line, and a radiator connected to a predetermined potential such as a ground potential. A noise eliminator in which a conductive member is covered with insulator is provided between the switching element (semiconductor switch) and the radiator (heatsink). A flexible connecting line connected to a conductive member of the noise eliminator is connected to an on-board line disposed on a circuit board.
Abstract:
An electronic-device having an intermediate connection layer interposed between a wiring substrate and an electronic component. The intermediate connection layer has a laminated structure including a rigid substrate and a flexible substrate. A first conductor part is formed on one principal surface of the flexible substrate, and second and third conductor parts are formed on both principal surfaces of the rigid substrate, respectively. The rigid substrate includes an opening, and the first conductor part of the flexible substrate includes a narrowed fuse part at a position opposite the opening. Windows are formed near the fuse part. The flexible substrate and the rigid substrate are electrically connected with each other via solder.
Abstract:
A multi-layer wiring board includes wiring layers stacked on a substrate with an insulating layer between each layer. A wire formed in the wiring layer consists of a first layer and a second layer to form a double layered structure. The first layer is made of a first conductive material and the second layer is made of a second conductive material having relative magnetic permeability of 10 or more and larger than that of the first conductive material. The characteristic impedance of the wire is adjusted to a value closer to 50 ohms than that of a wire which has the same thickness as of the wire with the double layered structure, and is made only of the first conductive material.
Abstract:
One object is to compensate the reduction of the Q value due to reduction of core sectional area of a coil of an inductor, and the reduction of positional accuracy and adhesive strength of components mounted on a printed circuit board due to reduction of area of external electrodes, both caused by downsizing of component sizes. An inductor is provided which includes: a coil formed in an insulator and having one end and the other end thereof formed in a direction away from a mounting surface; and lead-out portions connected to the coil at positions more distant from the mounting surface than a portion of the coil closest to the mounting surface.
Abstract:
A printed circuit board (e.g., 103) includes capacitor elements (e.g., 121 and 122). The capacitor element (e.g., 121) returns a common mode current included in a signal output from a signal output terminal (e.g., 111) of a semiconductor element (e.g., 102), to a ground terminal (e.g., 113) of the semiconductor element (e.g., 102). The capacitor element (e.g., 122) returns a common mode current included in a signal output from a signal output terminal (e.g., 112) of the semiconductor element (e.g., 102), to the ground terminal (e.g., 113) of the semiconductor element (e.g., 102). The capacitor elements (e.g., 121 and 122) are arranged such that the mutual inductance between a parasitic inductance of the capacitor element (e.g., 121) and a parasitic inductance of the capacitor element (e.g., 122) for the common mode currents is a negative value. Accordingly, the effective inductances of the first and second capacitor elements for the common mode currents are reduced, which suppresses radiation noise.
Abstract:
The present invention proposes substrate material favoring via hole electroplating to overcome the conventional problem that the polymer-based printed circuit board is hard to conduct electricity and likely to have poor electroplating quality. The present invention adds a conductive material to a polymeric material and controls the proportions and structure thereof to form a substrate material so as to improve the affinity of the substrate material to the metal electroplated inside the via hole with the resistance of the substrate material remaining in an allowable range. Thereby is increased yield and efficiency and saved time and cost in fabricating printed circuit boards. Further, the present invention reduces the proportion of the polymeric material with the mechanical strength remaining in an allowable range so as to decrease the overall expansion rate and obtain a fire-proof effect. Therefore, the substrate material can be used to fabricate precision products.