摘要:
A method for forming bumps including the steps of forming bumps on a dummy wafer. The dummy wafer is diced into dummy chips and the bumps formed on the dummy chips are inspected. Thus only good bumps are transferred to a real chip on which circuit patterns are formed.
摘要:
A multi-chip module (MCM) having semiconductor chips on a top surface of multi-layered interconnection circuits formed on a planar surface of a substrate including: (a) multi-layered interconnection circuits comprising alternatively laminated interconnection layers with insulating layers, and thermal contacts, each of the thermal contacts comprising successively laminated interconnection layers on a bottom and on side-walls of a vertical hole penetrating a plurality of the insulating layers, and a thermal conductor filling the vertical hole on the successively laminated interconnection layers, and (b) a plurality of the semiconductor chips attached to the thermal conductor. In a preferred embodiment, a V-shaped vertical hole is formed in the insulating layers of polyimide for a thermal contact, copper films are successively laminated thereon, unpatterned copper and gold films are deposited thereon, and the entire surface of the metal film including the hole is coated by a silver-powder containing epoxy film, to which semiconductor chips are adhered.
摘要:
To operate faster, a memory system includes a central processing unit (CPU) for executing a first instruction, and for outputting first, second and third signals, a memory device for storing first data and the first instruction, a first buffer for storing second data, a controller for writing the second data into the memory device when the controller receives the first signal, for reading the first data from the memory device after writing the second data into the memory device when the controller receives the second signal, and for reading the first instruction from the memory device and sending the first instruction to the CPU before writing the second data into the memory device when the controller receives the third signal.
摘要:
The method of manufacturing a vertical magnetic head comprises the steps of: forming a resist pattern including a concave section on a wafer substrate; laminating a plurality of films in the concave section until forming a prescribed multilayer structure of the main magnetic pole; and removing the resist pattern. Inner faces of the concave section are perpendicular to a surface of the wafer substrate. The laminating step includes the sub-steps of: (a) performing a sputtering process, in which particles are perpendicularly sputtered with respect to the surface of the wafer substrate, a plurality of times so as to laminate a plurality of sputtered films in the concave section; and (b) removing the sputtered films, which have been stuck on the resist pattern in the sub-step (a), from the resist pattern. The sub-steps (a) and (b) are repeated until the prescribed multilayer structure is formed.
摘要:
The method comprises forming a plurality of wiring pattern layers on the front surface of a substrate. In the process of forming the wiring pattern layers, an insulator protection film keeps covering over the wiring pattern on the back surface of the substrate. When the formation of the wiring pattern layers has been completed on the front surface of the substrate, a penetrating hole is bored in the cured or hardened insulator protection film. The penetrating hole may be utilized as a conductive via or a conductive through hole. A wiring pattern layer is then formed over the hardened insulator protection film on the back surface of the substrate. It is possible to omit an additional process for removing the insulator protection film. The method contributes to further facilitation of production process and further reduction in production cost.
摘要:
A conductive pattern layer structure includes an insulating member containing polyimide, a patterned thin film formed on the insulating member, and a patterned conductive layer formed on the thin film. The patterned conductive layer contains copper. Further, the layer structure includes a patterned barrier layer covering an upper surface and side surfaces of the patterned conductive layer to prevent copper from being diffused into another insulating layer formed around the patterned barrier layer.
摘要:
A multi-layer wiring substrate includes a main substrate and a plurality of insulating films stacked on the main substrate. The plurality of insulating films have wiring patterns formed on wiring regions thereof and dummy wiring patterns formed on peripheral regions of the wiring regions. The wiring patterns include signal wiring patterns, power supply wiring patterns, and vias. The dummy wiring patterns correspond to the wiring patterns, respectively.
摘要:
A multi-layer film substrate comprising at least two laminated insulating layers composed of a polyimide having a low thermal expansion, wherein an adhesion layer composed of an Si-containing or SiO.sub.2 -dispersed polyimide is interposed between the low thermal expansion polyimide layers. The substrate is produced by laminating at least two insulating layers composed of a polyimide having a low thermal expansion, wherein the low thermal expansion polyimide layers are laminated through an adhesion layer composed of an Si-containing or SiO.sub.2 -dispersed polyimide.
摘要:
A method of producing a thin film multi-layered substrate involving the steps of subjecting a copper wiring formed on a substrate to chromate treatment with an aqueous solution containing potassium bichromate or sodium bichromate as a principal component and containing chromic anhydride blended therewith, forming an interlevel insulating film consisting of photosensitive polyimide on the copper wiring, and exposing and developing the photosensitive polyimide film to form a pattern. A miniature pattern can be formed at a high speed and with high production yield.
摘要:
A fuel injector inhibiting adhesion of deposits and simultaneously improving durability by a simple configuration is provided.A fuel injector having a valve body provided with a main space receiving fuel and an injection hole and a needle movably supported at the valve body and having a seal part at its front end, in which needle the movement causes the seal part to separate from or contact an inner surface of the valve body and thereby open or close a fuel passage communicating the main space and the injection hole of the valve body, the fuel injector characterized in that the injection hole of the valve body is covered by an injection hole coating comprised of a material with a lower adsorption and reactivity with oxygen compared with the material of the valve body itself, and the seal part of the needle is covered by a seal part coating comprised of a material higher in liquid-repellency compared with the material of the needle itself and not forming a metal surface. Preferably, the material of the injection hole coating is gold and the material of the seal part coating is a silica-based coating material.