Abstract:
The present disclosure relates to reducing unwanted RF noise in a printed circuit board (PCB) containing an RF device. An isolation filter is embedded in a PCB containing an RDF device. By placing the isolation filter as close as possible to the RF device in order to dramatically reduce unwanted RF noise due to unavoidable coupling between Vias and planes in the PCB structure.
Abstract:
The resistor device is provided with a resistive plate (11) of metal plate material, which is used as a resistance body; a radiative plate (15) of metal plate material, which is spaced from the resistive plate and intercrossed on the resistive plate; a molded resin body (19), which encloses an intercrossing portion of the resistive plate and the radiative plate; terminal portions of the resistive plate (11a), which comprises so that both ends of the resistive plate extending from the molded resin body are bent along an end face and a bottom face of the molded resin body; and terminal portions of the radiative plate (15a), which comprises so that both ends of the radiative plate extending from the molded resin body are bent along an end face and a bottom face of the molded resin body. Accordingly, the surface-mountable resin-sealed metal plate resistor device is enabled to increase the power capacity drastically and to improve the reliability without changing most of the size.
Abstract:
In a method for manufacturing a ceramic multilayer substrate, when a green ceramic stack prepared by stacking a plurality of ceramic green sheets is fired simultaneously with a ceramic chip electronic component disposed inside the green ceramic stack and including an external terminal electrode to produce a ceramic multilayer substrate having the ceramic chip electronic component inside, a paste layer is disposed in advance between the ceramic chip electronic component and the green ceramic stack, and these three are fired.
Abstract:
A packaging substrate includes: a core board with at least a cavity; a dielectric layer unit having upper and lower surfaces and encapsulating the core board and filling the cavity; a plurality of positioning pads embedded in the lower surface of the dielectric layer unit; at least a passive component having upper and lower surfaces with electrode pads disposed thereon and embedded in the dielectric layer unit so as to be received in the cavity of the core board at a position corresponding to the positioning pads; first and second wiring layers disposed on the upper and lower surfaces of the dielectric layer unit and electrically connected to the electrode pads of the upper and lower surfaces of the passive component through conductive vias, respectively. By embedding the passive component in the core board and the dielectric layer unit, the invention effectively reduces the height of the overall structure.
Abstract:
A circuit board includes a substrate, a conductive pattern arranged on the substrate that includes an interconnecting circuit. The circuit board also includes a plurality of land pads having a pair of first land pads on which no electronic components are mounted and electrically connected to each other through the interconnecting circuit. The circuit board further includes an insulating layer on the substrate. The insulating layer has first openings that allow the pair of the first land pads to be exposed through the insulating layer.
Abstract:
A printed circuit board includes a chip capacitor having electrodes and a metal film formed on one or more of the electrodes, an accommodating layer accommodating the chip capacitor inside the accommodating layer, a connection layer formed over the accommodating layer and having a via hole opening extending to the metal film, and a first via hole structure formed in the via hole opening of the connection layer and connected to the metal film on the one or more of the electrodes of the chip capacitor.
Abstract:
An electroconductive bonding material contains a thermosetting resin, a low-melting-point metal powder which is melted at a temperature equal to or lower than the thermosetting temperature of the thermosetting resin, a high-melting-point metal powder which is not melted at a temperature equal to or lower than the thermosetting temperature of the thermosetting resin and which reacts with the low-melting-point metal powder to form a reaction product having a high melting point of 300° C. or higher during heat-hardening of the thermosetting resin, and a reducing substance which removes an oxide formed on the surface of the high-melting-point metal powder. The total content of the low-melting-point metal powder and the high-melting-point metal powder is 75% to 88% by weight, and the particle size ratio D1/D2 of the average particle size D1 of the low-melting-point metal powder to the average particle size D2 of the high-melting-point metal powder is 0.5 to 6.0. Thereby, an electroconductive bonding material is provided which has good conduction properties and high connection strength even when reflow heat treatment is repeatedly carried out or thermal shock accompanied with a rapid temperature change is applied to the electroconductive bonding material, and an electronic apparatus using such an electroconductive bonding material.
Abstract:
Provided are a chip component mounting structure and a chip component mounting method, wherein when a plurality of chip components having different heights are mounted on a substrate via an anisotropic conductive film, position gaps which occur when the chip components are pressure-bonded to the substrate are prevented, and the chip components can be accurately mounted to the substrate at target positions; and a liquid crystal display device provided with the substrate. In the chip component mounting structure, a position fixing resin (4) for maintaining the orientation of chip components (2) which are pressure-bonded to a substrate (1) via an anisotropic conductive film (7) is provided. In the chip component mounting method, after the position fixing resin (4) for maintaining the orientation of the chip components (2) which are mounted to the substrate (1) via the anisotropic conductive film (7) is applied to the substrate (1) and cured, the chip components (2) are heated at a predetermined temperature and pressed at a predetermined pressure via an elastic sheet (5) provided on the chip components (2) and, then, pressure-bond to the substrate (1) together. The liquid crystal display is provided with such a substarate.
Abstract:
A bonding pad structure is disclosed, which is composed of two bonding pad units that are symmetrically disposed with respect to an axial line. Each bonding pad units is further composed of at least two bonding pads, i.e. each bonding pad unit is composed of at least one first bonding pad and at least one second bonding pad. In an embodiment, the first bonding pad is arranged next to the axial line and the second bonding pad is arranged at a side of the corresponding first bonding pad away from the axial line while enabling the first bonding pad and the corresponding second bonding pad to be interconnected to each other by a first neck portion. Thereby, a plurality of solder areas of different sizes can be formed by the interconnecting of the at least two bonding pad units that can be used for soldering electronic components of different sizes.
Abstract:
A printed board includes footprints which are electrically solder-bonded to a surface-mounting substrate, on which electronic components are mounted, and which assists the heat release from the surface-mounting substrate. The footprint comprises a fillet-forming division which is placed on an outer-edge side of the surface-mounting substrate and where solder is supplied independently when solder-bonding is performed. The fillet-forming division is solder-bonded to the same electrode as the electrode of the surface-mounting substrate to which the footprint is solder-bonded.