摘要:
The method includes positioning an electronic component using main marks formed on a metal layer and mounting the electronic component on a second surface of the metal layer with an adhesive layer interposed between the metal layer and both of the electronic component and terminals; then burying the electronic component and the main marks in an insulating substrate; then removing part of the metal layer and forming a first window for exposing the main marks therefrom and a second window for exposing the adhesive layer including a position corresponding to the terminal therefrom; then using the exposed main marks as references and forming a laser via hole LVH reaching the terminal in the adhesive layer exposed from the second window; and thereby forming a wiring pattern from the metal layer electrically connected to the terminal through a first conductive via formed by plating the LVH with copper.
摘要:
The method includes positioning an electronic component using main marks formed on a metal layer and mounting the electronic component on a second surface of the metal layer with an adhesive layer interposed between the metal layer and both of the electronic component and terminals; then burying the electronic component and the main marks in an insulating substrate; then removing part of the metal layer and forming a first window for exposing the main marks therefrom and a second window for exposing the adhesive layer including a position corresponding to the terminal therefrom; then using the exposed main marks as references and forming a laser via hole LVH reaching the terminal in the adhesive layer exposed from the second window; and thereby forming a wiring pattern from the metal layer electrically connected to the terminal through a first conductive via formed by plating the LVH with copper.
摘要:
A thin conductive layer which is to form a conductor pattern (18) is prepared, a mask layer (3) is formed on the conductive layer except a plurality of actual connection spots and at least one dummy connection spot on the conductive layer, actual solder pads (6) and a dummy solder pad (7) are formed, with use of solder, on the actual connection spots and the dummy connection spot, respectively, where the conductive layer is exposed, connection terminals (9) of an electric or electronic component (8) are connected to the actual solder pads (6), an insulating base (16) of resin is formed which is laminated directly on or indirectly via the mask layer (3) on the conductive layer and in which the component (8) is embedded, and part of the conductive layer is removed by using the dummy solder pad (7) as a reference, to form the conductor pattern (18).
摘要:
A method of manufacturing a component-embedded substrate comprises forming an adhesive layer on a metal layer formed on a supporting plate, and mounting an electric or electronic component on the adhesive layer, wherein the component includes a component main body and a protrusion that protrudes beyond the component main body toward the adhesive layer, the adhesive layer includes a first adhesive body and a second adhesive body, the first adhesive body is formed only at a position corresponding to the protrusion, the second adhesive body is formed in an area corresponding to the whole of the surface of the component facing the adhesive layer after the first adhesive body is cured, and the component is mounted with the protrusion aligned with the first adhesive body in the component mounting step.
摘要:
An internal combustion engine having first valve means disposed in the exhaust system and adapted to impart a resistance to the flow of exhaust gas to control the flow rate of the latter, and second valve means provided in the intake passage of said engine and adapted to introduce fresh air to the intake passage when r.p.m. of the engine has reached a predetermined value. During operation of the engine, a part of the exhaust gas is made to return into the combustion chamber due to the resistance imparted by the first valve means, and the unburned hydrocarbons in the exhaust gas returned to the combustion chamber are efficiently burned by the presence of fresh air which is introduced through the second valve means. Thus an improved internal combustion engine which can operate at a much improved fuel economy and which can minimize the emission of unburned hydrocarbons to the atmosphere is obtained.
摘要:
An ignition plug for an internal combustion engine which comprises a hollow cylindrical main body having one externally threaded end portion and the other end portion in the form of a nut, said threaded end portion being provided with jet orifices, air guide grooves and a communication groove; a tubular anode member having an insulation body and extending through said main body; a center electrode extending through said insulation body; and a check valve assembly mounted about the intermediate portion between the two end portions of the main body, said valve assembly comprising a ring-shaped valve housing having a tapered seat face and air intake bores and a ring-shaped valve body reciprocally received in said valve housing and having a matingly tapered outer surface for opening and closing said air intake bores in the valve housing.
摘要:
An electronic chime wherein at least two different audible frequency signals forming chime sound are generated by a frequency divider oscillated by an oscillating circuit capable of adjusting its output standard frequency clock pulse. These audible frequency signals are respectively amplitude modulated so as to be attenuated stepwise, and the chime sound is generated by such modulated signals and caused to disappear at attenuated state.
摘要:
A component-embedded substrate includes an electrically insulating base (11) of resin, an electric or electronic embedded component (8) and a dummy embedded component (7) both embedded in the insulating base (11), a conductor pattern (18) formed on at least one side of the insulating base (11) and connected directly to or indirectly via a connection layer (6) to the embedded component (8) and the dummy embedded component (7), and a mark (10) formed on a surface of the dummy embedded component (7) and used as a reference when the conductor pattern (18) is formed, whereby positional accuracy of the conductor pattern (18) relative to the embedded component (8) can be improved.
摘要:
The method includes forming an annular seat and main marks on a metal layer simultaneously so that the annular seat opposes with a terminal of an electronic component when the component is placed above the annular seat at a subsequent step; then positioning the electronic component in a mounting expected region using the main marks and mounting the electronic component with an adhesive layer therebetween; then burying the electronic component and the main marks in an insulating substrate; then removing part of the metal layer and thereby forming first and second windows; then irradiating the adhesive layer with laser using the exposed main marks thereby forming a laser via hole; and then filling the laser via hole with copper and forming a wiring pattern from the metal layer electrically connected to the terminal through a conductive via.
摘要:
A component-embedded substrate includes an electrically insulating base (11) of resin, an electric or electronic embedded component (8) and a dummy embedded component (7) both embedded in the insulating base (11), a conductor pattern (18) formed on at least one side of the insulating base (11) and connected directly to or indirectly via a connection layer (6) to the embedded component (8) and the dummy embedded component (7), and a mark (10) formed on a surface of the dummy embedded component (7) and used as a reference when the conductor pattern (18) is formed, whereby positional accuracy of the conductor pattern (18) relative to the embedded component (8) can be improved.