摘要:
A method for assembling an electronic component on a printed circuit board includes following steps. Firstly, a printed circuit board substrate including a central main portion and a peripheral unwanted portion is provided. Secondly, electrically conductive patterns and reinforcing patterns are formed on the main portion and the unwanted portion respectively. Thirdly, an electronic component is mounted on the main portion and electrically connected with the electrically conductive patterns. Fifthly, the unwanted portion is removed.
摘要:
A printed circuit board includes an insulating layer, a copper layer formed on the insulating layer and a reinforcing layer formed on the copper layer at opposite sides of the given portion. The copper layer includes a plurality of electrical traces at a given portion thereof. A thickness of the reinforcing layer increases in a direction away from the given portion. A method for manufacturing the printed circuit board is also provided in this disclosure.
摘要:
A circuit substrate includes an electrically conductive layer having electrically conductive patterns formed therein, an insulating layer having a through hole, and a composite layer positioned between the electrically conductive layer and the insulating layer. The through hole is configured for having an electronic component mounted thereon. The composite layer includes a polymer matrix and at least one carbon nanotube bundle embedded in the polymer matrix. One end of the at least one carbon nanotube bundle contacts the electrically conductive patterns, and the other is exposed in the through hole of the insulation layer.
摘要:
An exemplary method for manufacturing flexible printed circuit board is provided. A metal foil is supplied from a first feeding roller. The metal foil has a first surface and a second surface on two opposite sides of the metal foil. A first coverlay having a number of first openings defined therein is supplied from a second feeding roller and laminated on the first surface of the metal foil. Electrical traces are formed with the metal foil. A second coverlay having a number of second openings defined therein is supplied from a third feeding roller and laminated on the second surface of the metal foil. Each of the second openings registers with the respective first opening so that the electrical traces are exposed from the corresponding first and second openings. The method can improve quality and efficiency of manufacturing flexible printed circuit boards in a hollowed out form.
摘要:
An exemplary method for manufacturing printed circuit boards is provided. In the method, a copper clad substrate having a copper layer thereon is provided. A surface of the copper layer is roughened by applying an atmospheric pressure plasma thereto. A photoresist layer is formed on the roughened surface of the copper layer. The photoresist layer is exposed. The photoresist layer is developed to form a patterned photoresist layer, thereby exposing portions of the copper layer. The exposed portions of the copper layer exposed are removed so that the remaining portions of the copper layer form electrical traces. The patterned photoresist layer is removed.
摘要:
A semiconductor package includes a substrate unit, a die electrically connected to first contact pads, and a package body covering a first patterned conductive layer and the die. The substrate unit includes: (1) the first patterned conductive layer; (2) a first dielectric layer exposing a part of the first patterned conductive layer to form the first contact pads; (3) a second patterned conductive layer; (4) a second dielectric layer defining openings extending from the first patterned conductive layer to the second patterned conductive layer, where the second patterned conductive layer includes second contact pads exposed by the second dielectric layer; and (5) conductive posts extending from the first patterned conductive layer to the second contact pads through the openings, each of the conductive posts filling a corresponding one of the openings. At least one of the conductive posts defines a cavity.
摘要:
A Random Access Memory (RAM) with a plurality of cells is provided. In an embodiment, the cells of a same column are coupled to a same pair of bit-lines and are associated to a same power controller. Each cell has two inverters; the power controller has two power-switches. For the cells of the same column, the two power-switches respectively perform independent supply voltage controls for the two inverters in each cell according to data-in voltages of the bit-lines during Write operation.
摘要:
A substrate having single patterned metal layer applied in a package is provided. The substrate includes a first patterned dielectric layer, a patterned metal layer and a second patterned dielectric layer, wherein the patterned metal layer is embedded in the first patterned dielectric layer. Also, the top surfaces of the patterned metal layer and the first patterned dielectric layer lie in the same plane. At least part of the patterned metal layer are exposed from the holes formed on the lower surface of the first patterned dielectric layer, so as to form plural first contact pads for electrical connection downwardly. The second patterned dielectric layer, formed above the patterned metal layer and the first patterned dielectric layer, at least exposes part of the patterned metal layer to form plural second contact pads at the top surface of the patterned metal layer for electrical connection upwardly.
摘要:
A substrate having single patterned metal layer includes a patterned base having at least a plurality of apertures, the patterned metal layer disposed on the patterned base, and a first surface finish layer. Parts of the lower surface of the patterned metal layer are exposed by the apertures of the patterned base to form a plurality of first contact pads for downward electrical connection externally, and parts of the upper surface of the patterned metal layer function as a plurality of second contact pads for upward electrical connection externally. The first surface finish layer is disposed at least on one or more surfaces of the second contact pads, and the first surface finish layer is wider than the second contact pad beneath. A package applied with the substrate disclosed herein further comprises at least a die conductively connected to the second contact pads of the substrate.