Abstract: The flexible printed circuit board includes a base layer, a first circuit layer and a second circuit layer, the first circuit and the second circuit layer formed on both sides of the base layer; conducting holes extending through the base layer and the first copper layer, the conducting holes include annular copper ring embedded in the first circuit layer. A height difference between a surface of the annular copper ring and a surface of the first circuit layer is in a range from 0 to 3 micrometers. A method for manufacturing the flexible printed circuit board is also provided.

Abstract: A cooling plate of a first embodiment of the present disclosure is configured with a electronic device for heat dissipation. The cooling plate of the first embodiment disclosure includes a first plate, a second plate opposite to the first plate, a bonding line connected with the first plate and the second plate, a plurality of supporting columns, and a cooling liquid received between the first plate and the second plate. The first plate, the second plate, and the bonding line together define a cavity, the plurality of supporting columns and the cooling liquid are received in the cavity. The plurality of supporting columns connects perpendicularly with the first plate and the second plate. The cooling liquid communicates between the plurality of the supporting columns.

Abstract: A flexible printed circuit board with reduced ion migration from signal-carrying elements which are coated against corrosion includes an insulating layer, a wiring area, a copper electroplating layer, a nickel electroplating layer, a cover film, and a gold chemical-plating layer. The wiring area is formed on the insulating layer. The copper electroplating layer formed on the wiring area has a first portion and a second portion. The nickel electroplating layer is formed on at least the first portion and exposes sidewalls of the first portion. The cover film is formed on the second portion and fills in gaps of the copper electroplating layer. The gold chemical-plating layer is formed on top surface of the nickel electroplating layer and the sidewalls of the first portion.

Abstract: The present disclosure relates to a flexible circuit board. The flexible circuit board includes a first conductive trace substrate and a third conductive layer, a second conductive post and a third conductive post. The first conductive trace substrate includes a first insulating layer, a first conductive layer and a second conductive layer formed two opposite surfaces of the first insulating layer. The first conductive layer includes a first signal line, the second conductive layer includes a second signal line, and the first signal line is parallel connected with the second signal line.

Abstract: A printed circuit board includes a first printed circuit substrate and a second printed circuit substrate. The first printed circuit substrate includes a substrate layer and a first conductive circuit layer. The first conductive circuit layer is formed on the substrate layer. The substrate layer includes at least two first grooves. The first conductive circuit layer includes at least one signal wire. The first grooves are defined in both sides of the signal wire. The second printed circuit substrate is formed on the first printed circuit substrate. The second circuit substrate includes a third copper layer. A second groove is defined in the third copper layer. The first grooves are opposite to the second groove. The first grooves and the second groove form a space.

Abstract: A printed circuit board with high-capacity copper circuit includes a conductive trace, a first protecting layer, and a second protecting layer formed on opposite sides of the conductive trace. The conductive trace includes a base conductive trace pattern, a first conductive trace pattern, and a second conductive trace pattern. The first and second conductive trace patterns are directly formed on opposite surfaces of the base copper conductive trace pattern. A trace width of the first conductive trace pattern is the same as a line width of the second conductive trace pattern.

Abstract: A circuit board includes a core layer, at least one passive component, a first and a second conductive wire layers, at least one contact pad, and a resin packing layer. The core layer defines at least one through hole to receive the passive component. The first and the second conductive wire layers are connected to two opposite surfaces of the core layer. Each contact pad is positioned between and connected to one passive component and the first conductive wire layer. The resin packing layer is filled among the core layer, each passive component, each contact pad, the first and the second conductive wire layers. The resin packing layer can connect the first and the second conductive wire layers to the core layer, and connect the core layer, each passive component, and each contact pads to each other.

Abstract: A transparent flexible printed circuit board (FPCB) of reduced thickness but good conductivity and transparency includes an insulating resin layer. The insulating resin layer has a first surface and a second surface. At least one through hole is defined in the insulating resin layer through the first surface and the second surface. A conductive wiring layer is formed on the first surface and a wiring layer is formed on the second surface. The conductive wiring layers are made of electrically conductive resin, and have wiring openings. A cover film covers each of the conductive wiring layers, and further infills the wiring openings.

Abstract: A method of manufacture of a circuit board without annular through-hole rings and thus allowing a higher component density includes a base layer, a first wire pattern layer, and a second wire pattern layer on both sides of the base layer. A portion of the base layer not covered by the first wire pattern layer defines at least one first hole. The circuit board further includes a wire layer. The wire layer includes at least a first portion and a second portion connecting to the first portion. The first portion is filled in the first hole. The second portion is formed on the first portion extending away from the base layer. A diameter of the second portion is less than an aperture diameter of the first hole. The wire layer is electrically conductive between the first wire pattern layer and the second wire pattern layer through the first portion.

Abstract: A flexible printed circuit board with multiple layers includes an inner wiring substrate and at least one outer wiring plate. Each outer wiring plate is connected to one surface of the inner wiring substrate, and defines at least one through hole which passes through the outer wiring plate to expose the inner wiring substrate. Each outer wiring plate further includes an adhesive plate connected to the inner wiring substrate. The adhesive plate includes a stepped portion extending towards a center of the through hole.

Abstract: A method for making a conductive polymer for electromagnetic shielding purposes includes steps of mixing liquid crystal monomers, a silver complex, an initiator, and a catalytic agent in certain proportions by weight to form a mixture. A solvent is added into the mixture, the mixture and the solvent being in a ratio from 3:17 to 1:3 by weight. The mixture is heated to undergo an atom transfer radical polymerization.

Abstract: The present disclosure relates to a method for manufacturing a printed circuit board. The method includes the steps as follows. First, a substrate including a base layer and a copper foil layer on a surface of the base layer is provided. Second, a conductive layer is formed on portions of the copper foil layer. Third, portions of the copper foil layer exposed from the conductive layer are removed by an etching process, and the conductive layer is thinner by the etching process. The reserved portions of the copper foil layer and the conductive layer form a conductive pattern to obtain a printed circuit board without plating wires. A printed circuit board without plating wires made by the above method is also provided.

Abstract: A printed circuit board includes a first printed circuit substrate and a second printed circuit substrate. The first printed circuit substrate includes a substrate layer and a first conductive circuit layer. The first conductive circuit layer is formed on the substrate layer. The substrate layer includes at least two first grooves. The first conductive circuit layer includes at least one signal wire. The first grooves are defined in both sides of the signal wire. The second printed circuit substrate is formed on the first printed circuit substrate. The second circuit substrate includes a third copper layer. A second groove is defined in the third copper layer. The first grooves are opposite to the second groove. The first grooves and the second groove form a space. The signal wire is surrounded by air in the space. A method for manufacturing the printed circuit board is also provided.

Abstract: A flexible circuit board includes a wiring layer, two photosensitive resin layers, and two electromagnetic interference shielding layers. The wiring layer includes at least one signal line, two ground lines and at least two gaps. Each gap includes two opening portions. The two photosensitive resin layers cover the signal line and the opening portions, and are connected to each end of each ground line. Each electromagnetic interference shielding layer covers one photosensitive resin layer away from the signal line, portions of the two ground lines not connected to the photosensitive resin layer, and portions of the gaps not covered by the two photosensitive resin layers, thereby causing the portions of each gap not covered by the two photosensitive resin layers to define a receiving chamber. Each end of each receiving chamber communicates with one opening portion of the corresponding gap to define a cavity.

Abstract: A flexible circuit board includes an insulating layer, a linear signal line, a plurality of grounding lines, a metal coating layer, a circuit layer and an electromagnetic shielding layer. The insulating layer includes a first face and a second face. The metal coating layer covers the linear signal line on the first face. The metal coating layer has a thickness less than that of the linear signal line, and an electrical conductivity larger than that of the linear signal line. The grounding lines are at two opposite sides of the linear signal line on the first face. The circuit layer is on the second face. The electromagnetic shielding layer covers the linear signal line and the grounding lines. The linear signal line and the grounding lines are between the electromagnetic shielding layer and the circuit layer. A method for manufacturing the flexible circuit board is also provided.

Abstract: A flexible circuit board includes two copper clad laminates, a circuit pattern and two bonding layers. Each copper clad laminate includes an insulating base and an outer circuit layer. The circuit pattern is located between the two copper clad laminates. The circuit pattern includes a linear signal line, two grounding lines located at two opposite sides of the linear signal line, and two hollow areas located between the linear signal line and the grounding lines. Each bonding layers is located between the circuit pattern and a corresponding copper clad laminate. Each boding layer defines a slot without adhesive therein. The bonding layers are spaced from the linear signal line by the slots. The slots and the hollow areas cooperatively define an air medium layer enclosing the linear signal line. A method for manufacturing the flexible circuit board is also provided.

Abstract: A flexible circuit board includes a first base layer, a circuit layer, a second base layer and a bonding layer. The circuit layer is coupled to a side of the first base layer and includes a linear signal line, two grounding lines located at two opposite sides of the linear signal line, and two hollow areas located between the linear signal line and the grounding lines. The bonding layer couples the second base layer to the circuit layer and defines a first opening corresponding to the linear signal line and communicating with the hollow areas of the circuit layer. The first opening of the bonding layer and the hollow areas of the circuit layer cooperatively define an air medium layer surrounding the linear signal line. A method for manufacturing the flexible circuit board is also provided.

Abstract: A package on package structure includes a connection substrate having a main body and electrically conductive posts, the main body includes a first surface and an opposite second surface, and each electrically conductive post passes through the first and second surfaces, and each end of the two ends of the electrically conductive post protrudes from the main body; a first package device arranged on a side of the first surface of the connection substrate; a package adhesive arranged on a side of the second surface of the connection substrate; and a second package device arranged on a side of the package adhesive furthest away from the first package device.

Abstract: A method for manufacturing a package on package structure includes the steps of: providing a connection substrate comprising a main body and electrically conductive posts, the main body comprising a first surface and an opposite second surface, each electrically conductive post passing through the first and second surfaces, and each end of the two ends of the electrically conductive post protruding from the main body; arranging a first package device on a side of the first surface of the connection substrate, arranging a package adhesive on a side of the second surface of the connection substrate, thereby obtaining a semi-finished package on package structure; and arranging a second package device on a side of the package adhesive furthest from the first package device, thereby obtaining a package on package structure.