Abstract:
A wiring substrate includes an insulating layer including a first layer and a second layer, and a conductor layer including a metal film formed on a surface of the second layer of the insulating layer such that the conductor layer includes a conductor pattern. The first layer includes resin and first inorganic particles, the second layer includes resin and second inorganic particles at the content rate that is lower than the content rate of the first inorganic particles in the first layer, and the thickness of the first layer is 90% or more of the thickness of the insulating layer. The second layer of the insulating layer includes a composite layer having the thickness in the range of 0.1 to 0.3 μm, and the composite layer includes part of the metal film in the conductor layer formed in gaps between the second inorganic particles and resin in the second layer.
Abstract:
A component-embedded substrate includes a substrate portion, an embedded electronic component, and a resin portion. The substrate portion has inner electrodes on an inner principal surface. The embedded electronic component has terminal electrodes and is mounted to the substrate portion via solder fillets adhering to the respective terminal electrodes and the respective inner electrodes. The resin portion is stacked on the substrate portion, with the embedded electronic component embedded therein. The resin portion includes a no-filler-added layer and a filler-added layer. The no-filler-added layer extends from the inner principal surface to a height which allows at least the solder fillets to be covered. The filler-added layer contains an inorganic filler and extends from an interface with the no-filler-added layer to a height which allows at least the embedded electronic component to be covered.
Abstract:
A substrate for a printed circuit board according to an embodiment of the present invention includes a base film having an insulating property, and a metal layer formed on at least one surface side of the base film. In the substrate for a printed circuit board, a plurality of fine particles are disposed between the base film and the metal layer, and the fine particles are formed of a metal the same as a main metal of the metal layer or formed of a metal compound of the main metal. The fine particles preferably have an average particle size of 0.1 nm or more and 20 nm or less. The fine particles are preferably formed of a metal oxide or a metal hydroxide. The fine particles are preferably present between the base film and the metal layer so as to form a layer. The metal layer preferably includes a metal grain layer formed by firing metal nanoparticles.
Abstract:
In a layered structure having at least a substrate and a photosensitive resin layer or cured film layer formed on the substrate and containing an inorganic filler, the content of the inorganic filler in the photosensitive resin layer or cured film layer is low on the side contacting the substrate and high on the surface side away from the substrate, so that a linear thermal expansion coefficient of the photosensitive resin layer or cured film layer as a whole is maintained as low as possible. Preferably, the inorganic filler content in the layer gradually increases continuously obliquely or stepwise from the side contacting the substrate to the surface side away from the substrate. A photosensitive dry film containing the above-mentioned photosensitive resin layer is suitable for use as a solder resist or an interlayer resin insulation layer of a printed wiring board.
Abstract:
A method of operating an imprinted electronic sensor to sense an environmental factor includes providing spatially separated micro-channels in a cured layer on a substrate. A multi-layer micro-wire is formed in each micro-channel. Each multi-layer micro-wire includes at least a conductive layer and a reactive layer exposed to the environmental factor. The conductive layer is a cured electrical conductor located only within the micro-channel and at least a portion of the reactive layer responds to the environmental factor. A controller is provided for electrically controlling first and second groups of multi-layer micro-wires, each first and second group including one or more multi-layer micro-wires. The reactive layer is exposed to the environment. The controller measures the electrical response of the first and second groups of multi-layer micro-wires. The electrical response includes at least one of the amperometric response, the resistance, the capacitance, the impedance, the complex impedance, or the inductance.
Abstract:
A circuit board is provided with a metal wiring layer 12 on at least one principal surface of a ceramic sintered body 11, wherein the above-described metal wiring layer includes a first region 12a which is in contact with the principal surface and which contains a glass component and a second region 12b which is located on the first region 12a and which does not contain a glass component, the thickness of the first region 12a is 35% or more and 70% or less of the thickness of the metal wiring layer 12, and the average grain size in the first region 12a is smaller than the average grain size in the second region 12b.
Abstract:
A base substrate includes a ceramic sintered substrate having through holes, first and second metal wirings which are integrally disposed so as to be connected to the surface of the ceramic sintered substrate and the inside of the through holes, and first and second active metal layers which are disposed between the ceramic sintered substrate and the first and second metal wirings.
Abstract:
A multi-layer micro-wire structure includes a substrate having a surface. A plurality of micro-channels is formed in the substrate. A first material composition is located in a first layer only in each micro-channel and not on the substrate surface. A second material composition different from the first material composition is located in a second layer different from the first layer only in each micro-channel and not on the substrate surface. The first material composition in the first layer and the second material composition in the second layer form an electrically conductive multi-layer micro-wire in each micro-channel.
Abstract:
A solder layer and an electronic device bonding substrate having high bonding strength of a device and low bonding failure even by a simplified bonding method of a device to a substrate and a method for manufacturing the same are provided.A device bonding substrate 1 including a substrate 2 and a lead free solder layer 5 formed on said substrate has a solder layer 5 consisting of a plurality of layers having mutually different phases, and oxygen concentration on the upper surface of the solder layer is lower than 30 atomic % of the concentration of the metal component which is the most oxidizable among the metal components making up the upper layer of the solder layer 5. Carbon concentration on the upper surface of the solder layer 5 may be lower than 10 atomic % of the concentration of the metal component which is the most oxidizable among the metal components making up the upper layer of the solder layer.
Abstract:
In a layered structure having at least a substrate and a photosensitive resin layer or cured film layer formed on the substrate and containing an inorganic filler, the content of the inorganic filler in the photosensitive resin layer or cured film layer is low on the side contacting the substrate and high on the surface side away from the substrate, so that a linear thermal expansion coefficient of the photosensitive resin layer or cured film layer as a whole is maintained as low as possible. Preferably, the inorganic filler content in the layer gradually increases continuously obliquely or stepwise from the side contacting the substrate to the surface side away from the substrate. A photosensitive dry film containing the above-mentioned photosensitive resin layer is suitable for use as a solder resist or an interlayer resin insulation layer of a printed wiring board.