Abstract:
A substrate with hermetically sealed vias extending from one side of the substrate to another and a method for fabricating same. The vias may be filled with a conductive material such as, for example, a fritless ink. The conductive path formed by the conductive material aids in sealing one side of the substrate from another. One side of the substrate may include a sensing element and another side of the substrate may include sensing electronics.
Abstract:
A wiring board in which silver is deposited near a via-conductor includes a ceramic substrate having a via-hole, a via-conductor disposed in the via-hole, and a metal thin-film pattern which is disposed on the ceramic substrate such that the metal thin-film pattern is connected to the via-conductor. The via-conductor contains silver or a material principally containing silver. A silver deposit that is a piece of the via-conductor is disposed on a surface portion of the ceramic substrate that is located near the via-hole. A catalyst layer containing a metal material is disposed over an exposed face of the via-conductor and the surface portion of the ceramic substrate. A metal layer is disposed on the catalyst layer. The metal thin-film pattern is disposed over the metal layer and the ceramic substrate.
Abstract:
In order to provide a circuit substrate with a satisfactory step coverage by the protective layer and the anti-cavitation film in an edge portion of wirings and a liquid discharge head utilizing such circuit substrate, the invention provides a method for producing a circuit substrate provided, on an insulating surface of a substrate, with a plurality of elements each including a resistive layer and a pair of electrodes formed with a predetermined spacing on said resistive layer, including a step of forming an aluminum electrode wiring layer on the resistive layer, a step of isolating the electrode wiring layer by dry etching into each element, and a step of forming the electrode wiring into a tapered cross section with an etching solution containing phosphoric acid, nitric acid and a chelating agent capable of forming a complex with the wiring metal.
Abstract:
A method of reflowing a polymer to form a spring or coil structure is described. A polymer is deposited over stress engineered thin film with an internal stress gradient. The polymer serves as a loading prevent release of the internal stress until a solvent vapor softens and reflows the polymer. As the polymer softens, the internal stress within the thin film is gradually released allowing controlled curling of the thin film out of a substrate plane. In one embodiment, the thin film forms the windings of a coil structure.
Abstract:
A wired circuit board having a semi-conducting layer which has excellent chemical resistance, such as acid resistance and alkali resistance, provides no possibility of minute particles being mixed into parts mounted on the wired circuit board; and yet has excellent surface resistivity against electrostatic damage. In the wired circuit board having a conductive layer formed on one side of a base insulating layer in the form of a predetermined wired circuit pattern and a cover insulating layer formed on the conductive layer, a base-side semi-conducting layer and a cover-side semi-conducting layer, which include metal oxide, metal nitride or metal carbide, are formed on the other side of the base insulating layer and the cover insulating layer, respectively, by physical vapor deposition (PVD) or preferably by sputtering.
Abstract:
A wired circuit board that can remove static electricity not only from an insulating base layer and an insulating cover layer but also from a terminal portion, to effectively prevent an electronic component mounted from being damaged by static electricity and also prevent stripping of a semi-conductive layer. In a suspension board with circuit including an insulating base layer formed on a metal supporting board, a conductive pattern formed on the insulating base layer, and an insulating cover layer, formed on the insulating cover layer, to cover the conductive pattern and form an opening, semi-conductive layer is formed in succession on an upper surface of the insulating base layer covered with the insulating cover layer, on a lateral side surface and an upper surface of the conductive pattern, and on a lateral side surface of the insulating base layer adjacent to the metal supporting board.
Abstract:
A semiconductor package substrate with embedded resistors and a method for fabricating the same are proposed. Firstly, an inner circuit board having a first circuit layer thereon is provided, and a plurality of resistor electrodes are formed in the fist circuit layer. Then, a patterned resistive material is formed on the inner circuit board and electrically connected to the resistor electrodes to accurately define a resistance value of resistors. Subsequently, at least one insulating layer is coated on a surface of the circuit board having the patterned resistive material. At least one patterned second circuit layer is formed on the insulating layer and electrically connected to the resistor electrodes by a plurality of conductive vias formed in the insulating layer or plated through holes formed through the circuit board.
Abstract:
A method for fabricating a high-frequency and high-power semiconductor module uses two stages respectively adopting a thick-film process to form resistors or elements of high impedance, and a thin film process to form precise circuit wires or elements.
Abstract:
Ceramic substrates (1) for microelectronic modules are formed in multiple layers (7 & 9) fused into a unitary one-piece assembly. The layers contain the same ceramic material but in different purity so that one outer layer (9) is optimal in composition for bonding to a thick film conductor (11) and the other outer layer (7) is optimal in composition for bonding to a thin film conductor (13). In a dual composition substrate embodiment one layer is formed of a 96% alumina composition and the second layer is formed of a 99.6% alumina composition.
Abstract:
A method of formation of a capacitor forming part of an electric circuit when producing a circuit board, consisting of forming a valve metal bottom electrode layer and a valve metal oxide dielectric layer on the same, then integrally forming a solid electrolyte layer comprised of an organic semiconductor and a top electrode layer comprised of metal on the same, this integral formation step consisting of the step of holding one surface of metal foil for the top electrode at a bonding wedge and making the other surface of the metal foil carry a powder of the organic semiconductor by compression bonding and heating and the step of compression bonding the organic semiconductor powder carried by compression bonding at the dielectric layer by a bonding wedge through metal foil, whereby a solid electrolyte layer comprised of an organic semiconductor sandwiched between the metal foil and dielectric layer and closely bonded with the two is formed, a capacitor built into a circuit board, a circuit board including a capacitor, and a method of production of the circuit board.