Abstract:
A multilayer printed wiring board which is constructed such that a conductor circuit (29) is formed on a core substrate (21) via an interlayer resin insulation layer (32), a through hole (23) is provided in the core substrate and a filler (25) is filled in the through hole. The interlayer resin insulation layer on the core substrate is flat and a roughened layer (31) of the same kind is formed on the entire surface including side surfaces of the conductor circuit on the core substrate. A cover plated layer (30) is formed directly above the through hole, a roughened layer is formed on the entire surfaces including side surfaces of this conductor layer and the conductor circuit located in the same layer of the conductor layer, and a flat-surface interlayer resin insulation layer for filling a recess between conductors is formed on the surface of this roughened layer, thereby providing an excellent crack resistance under such conditions as a heat cycle and eliminating a possible damage to the cover plated layer.
Abstract:
A resin filler preferably packed in recesses occurring in the surface of a wiring board or in through holes provided therein, and a structure of a highly reliable built-up multilayer printed wiring board filled with the same resin filler are proposed. This resin filler is a solventless resin filler to be packed in the recesses occurring in the surface of a wiring board or in the through holes provided therein, the resin filler being characterized in that the filler contains resin components of bisphenol type epoxy resin and a curing agent of imidazole, and an additive component of inorganic particles as necessary. A built-up multilayer printed wiring board using this resin filler is also proposed.
Abstract:
A method of making an insulated patterned layer of an electrically conductive metal includes the steps of: (i) applying a layer of a radiation-curable material (2) to a substrate (1); (ii) imagewise exposing the layer of radiation-curable material to radiation to thereby cure portions (2a) of the layer exposed to such radiation; and (iii) removing the portions (2b) of the layer not exposed to radiation by means of a suitable solvent to thereby produce upon the substrate a patterned layer of cured radiation-curable material; and subsequently introducing electrically conductive metal (4) into the depressions (tracks) in the patterned relief layer.
Abstract:
A flexible multilayer construction is configured for mounting an electronic device. The flexible multilayer construction includes electrically conductive spaced apart first and second pads for electrically connecting to corresponding electrically conductive first and second terminals of the electronic device. The first and second pads define a capillary groove therebetween that is at least partially filled with an electrically insulative reflective material by a capillary action.
Abstract:
A mounting device (100) for mounting electronic components, wherein the mounting device (100) comprises a carrier structure, in particular an electrically conductive structure (102), and a sliding structure (104) being at least partially embedded within the carrier structure, in particular the electrically conductive structure (102), and being made of a material which has non-adhesive properties on material of the carrier structure, in particular the electrically conductive structure (102), so that portions of the carrier structure, in particular the electrically conductive structure (102), are capable of sliding on the sliding structure (104) to thereby at least partially equilibrate mechanical stress within the mounting device (100).
Abstract:
Disclosed is a printed circuit board. The printed circuit board includes an insulating layer, a copper foil formed on the insulating layer and formed therein with a groove to expose a portion of a top surface of the insulating layer, and a thermal conductive layer filled in the groove.