Abstract:
A circuit pattern forming method is provided which can reduce a possibility of undesired short-circuits being produced in the circuit by satellites formed when fabricating a conductive pattern and thereby can form a highly reliable printed circuit board. To that end, this invention overlappingly draws a conductive pattern (11) and an insulating pattern (13) of a predetermined thickness by scanning a liquid ejection head and a substrate (10) relative to each other a plurality of times while ejecting droplets of a conductive pattern forming solution (11) and an insulating pattern forming solution (13). When forming the conductive pattern and the insulating pattern that adjoin each other on the substrate, the step of forming the insulating pattern of at least one scan is executed between the conductive pattern forming steps that are executed the plurality of times until the conductive pattern has a predetermined thickness.
Abstract:
A system and method is disclosed for providing mechanical planarization of a sequential build up substrate for an integrated circuit package. A planarization plate is placed in contact with an uneven external surface of a dielectric layer that covers underlying functional circuit elements and filler circuit elements. A heating element in the planarization plate flattens protruding portions of the external surface of the dielectric layer to create a flat external surface on the dielectric layer. After the flat external surface of the dielectric layer has cooled, it is then covered with a metal conductor layer. The method of the present invention increases the number of sequential buildup layers that may be placed on a sequential buildup substrate.
Abstract:
A printed wiring board in which an opening existing around a pad which is a photovia land is arranged so that it is not overlapped with the pad, the area of an opening existing around a pad and that of another opening are equalized, the quantity of resin which is filled in each opening or is equalized throughout a printed wiring board and the quantity of resin overflowing from each opening or when resin is filled in each opening or is uniformed is provided. According to such a printed wiring board, a reliable printed wiring board wherein secure connection is enabled without causing disconnection can be realized when a circuit pattern provided on an interlayer insulating board formed on the printed wiring board and a conductor pad are connected by arranging an opening existing around a conductor pad so that it is not overlapped with the conductor pad and substantially equalizing the quantity of resin which is filled in an opening around a conductor pad and that of resin which is filled in another opening.
Abstract:
The object is to provide a printed circuit board which is also suitable for relatively high currents and is more resistant to environmental influences such as moisture and mechanical loads. The thickness of the conductor tracks (2) is made appreciably greater than 100 µm, and the intermediate spaces between the conductor tracks (2) are filled with a filling material (3) which has greatest possible adhesion to the conductor tracks (2), to the base plate (1) and to the solder resist mask (4) applied to the arrangement, being filled in such a way that the printed circuit board has a substantially planar surface without interruptions or depressions.
Abstract:
A multilayer circuit board comprises a conductor wiring layer (5,6), and an insulation layer (7), wherein the conductor wiring layer (5,6) and the insulation layer (7) are laminated alternately, wherein the conductor wiring layer (5,6) is electrically connected by a via (4) through the insulation layer (7), wherein the via (4) is filled with a conductor material (3), and wherein the conductor material (3) is junctured to the conductor wiring layer (5,6) with an alloy (1,2).
Title translation:VERFAHREN ZUR HERSTELLUNG EINES MASSEREICHEN OHMSCHEN WIDERSTANDZ ZUM SURGESCHUTZ VON ELEKTRONISCHEN BAUEINHEITEN UND ELEKTRONISCHE BAUEINHEIT
Abstract:
The invention relates to an electronic assembly, in particular, for low power consumption electric switching devices such as low power contactors, time relays or the like. In order to provide protection against input current pulses, an ohmic resistor (6) is provided in the form of a resistive layer that is applied by pressing.
Abstract:
Disclosed is a three dimensional structure comprising a porous body (1) and a plurality of regions (2) having a substance loaded in the porous body. In one embodiment the average period of a part of the plural regions loaded with the substance is 0.1 to 2µm to form a structure having a photonic band gap. In another embodiment the substance loaded in the porous body is a conductive material, thus forming a three dimensional wiring pattern.
Abstract:
A method for manufacturing a microelectronic assembly to have a resistor (12) on a circuit board (10). The method entails applying a photosensitive dielectric to a substrate (18) to form a dielectric layer. The dielectric layer is photoimaged to polymerize a first portion (22). An electrically resistive film (14) is then applied to the dielectric layer and the dielectric layer is developed so that a portion of the resistive film remains over the second portion to form the resistor. A second dielectric layer (32) is then applied, photoimaged and developed to form openings (34). Terminations (16) can then be formed in the openings by known plating techniques. The resistive film is preferably a multilayer film that includes an electrically resistive layer, such as NiP, NiCr or other nickel alloy and a sacrificial backing such as a layer of copper.
Abstract:
Mehrlagen-Leiterplatten-Verbundkörper (5) mit mindestens zwei flächig übereinander angeordneten Leiterplatten (9), welche jeweils aufweisen eine elektrisch isolierende Trägerplatte (10), elektrisch leitende Leiterbahnen (11), die auf mindestens einer Seite der Trägerplatte (10) vorgesehen sind und Ausnehmungen (12), die seitlich von den Leiterbahnen (11) und zur Trägerplatte (10) hin durch die Trägerplatte (10) begrenzt werden, und mit mindestens einer zwischen den Leiterplatten (9) angeordneten Verbundfolie (14) zum Verbinden der Leiterplatten (9), wobei die zwischen den Trägerplatten (10) der jeweiligen Leiterplatten (9) angeordneten Ausnehmungen (12) im wesentlichen vollständig mit einer Kunstharz-Masse (13) ausgefüllt sind und wobei die mindestens zwei Leiterplatten (9) und die mindestens eine Verbundfolie (14) miteinander verpreßt sind.
Abstract:
A method for forming low-impedance high density deposited-on-laminate (D/L) structures (10) having reduced stress features reducing metallization present on the laminate printed circuit board (12). In this manner, reduced is the force per unit area exerted on the dielectric material (30) disposed adjacent to the laminate material (16) which is typically present during thermal cycling of the structure.