Abstract:
In conducting wiring by masking the portion other than the portion to be wired of a metallic laminate with a photoresist for plating and subjecting only the portion to be wired to pattern plating, the provision of a noble metal layer made of gold, platinum or the like, or a metallic layer made of a metal having a larger ionization tendency than that of a metal used in the pattern plating on the metallic layer constituting the undercoat of the photoresist for plating enables the peeling of the resist for plating to be prevented and excellent fine wiring to be conducted.
Abstract:
PROBLEM TO BE SOLVED: To provide a semiconductor buffer structure which reduces a dislocation density in a nitride thin film when the nitride thin film grows on a silicon substrate.SOLUTION: A semiconductor buffer structure according to the present embodiment comprises: a plurality of nitride semiconductor layers in which average relative proportions of gallium increases with distance in one direction; and a dislocation control layer formed from AlInGaN (0≤a1≤1, 0≤b1≤1, a1+b1≠1) arranged between adjacent nitride semiconductor layers among the plurality of nitride semiconductor layers. Because of interposition of the dislocation control layer, a location density of the whole of the plurality of nitride semiconductor layers can be decreased.
Abstract:
A wiring board includes an electrode pad having a first surface and a second surface located on an opposite side from the first surface, a conductor pattern connected to the first surface of the electrode pad, and an insulator layer embedded with the electrode pad and the conductor pattern. The insulator layer covers an outer peripheral portion of the second surface of the electrode pad.
Abstract:
PROBLEM TO BE SOLVED: To provide a wiring board including a conductor post which deals with high density assembly, and to provide a manufacturing method of the wiring board.SOLUTION: A wiring board 10 includes a conductor layer 12, a solder resist layer 13 laminated on the conductor layer 12, and a conductor post 16 which establishes electrical continuity with the conductor layer 12a disposed on the lower side of a through hole 131 provided at the solder resist layer 13. The solder resist layer 13 includes a thermosetting resin. The conductor post 16 is composed mainly of stannum, copper, or solder and has a lower conductor post 161 positioned in the through hole 131 and an upper conductor post 162 positioned on the lower conductor post 161 and extends toward the outside of the solder resist layer 13. At least a part of a lower end surface 162b of the upper conductor post 162 is closely in contact with an exterior surface 132 of the solder resist layer 13.
Abstract:
This disclosure relates to a transmission line for high performance radio frequency (RF) applications. One such transmission line can include a bonding layer configured to receive an RF signal, a barrier layer, a diffusion barrier layer, and a conductive layer proximate to the diffusion barrier layer. The diffusion barrier layer can have a thickness that allows a received RF signal to penetrate the diffusion barrier layer to the conductive layer. In certain implementations, the diffusion barrier layer can be nickel. In some of these implementations, the transmission line can include a gold bonding layer, a palladium barrier layer, and a nickel diffusion barrier layer.
Abstract:
An electroconductive substrate, including: a base material; a foundation layer disposed on the base material; a trench formation layer disposed on the foundation layer, and an electroconductive pattern layer including metal plating. A trench including a bottom surface to which the foundation layer is exposed, is formed. The trench is filled with the electroconductive pattern layer. The foundation layer includes a mixed region which is formed from a surface of the foundation layer on the electroconductive pattern layer side towards the inside thereof, and contains metal particles which contain a metal configuring the electroconductive pattern layer, and enter the foundation layer.
Abstract:
A three-dimensional wiring board production method is provided that includes: a preparation step of preparing a resin film (1) having a breaking elongation of 50% or more; a first metal film formation step of forming a first metal film (3) on a surface of the resin film; a pattern formation step of performing patterning on the first metal film to form a desired pattern; a three-dimensional molding step of performing three-dimensional molding by heating and pressurizing the resin film; and a second metal film formation step of forming a second metal film (21) on the first metal film having a pattern formed thereon. In the first metal film formation step, metal is deposited in a particle state to form the first metal film in a porous state.
Abstract:
A manufacturing method of a composite substrate is provided. A first conductive layer is formed on a first liquid crystal polymer layer. The first conductive layer is patterned to form a patterned first conductive layer. A second liquid crystal polymer layer including a soluble liquid crystal polymer is formed to cover the patterned first conductive layer. The second liquid crystal polymer layer which is on the patterned first conductive layer is removed.