Abstract:
A PCB includes a base layer, a wiring pattern formed on a surface of the base layer, and a protecting layer formed on the wiring pattern. The protecting layer is formed by printing and solidifying an ink on the wiring pattern. The ink includes a cycloaliphatic epoxy resin, a phenoxyl resin solution, a solvent, a hardener, and an antifoaming agent.
Abstract:
An FPCB includes a flexible base, a wiring layer formed on a top surface of the base, a covering layer formed on the wiring layer, and a shielding layer formed on a portion of the covering layer. The wiring layer includes a grounding line. The covering layer defines an opening to expose the grounding line to the outside. A portion of the shielding layer fills into the opening. The shielding layer is electrically connected to the grounding line through the opening.
Abstract:
A polyimide is formed by dehydrating a polyamic acid. The polyamic acid is formed by polymerizing a diamine and a fluorine dianhydride. The diamine is 2,2′-bis[4-(4-aminophenoxy) phenyl] propane, and the fluorine dianhydride is 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride. When a color of the polyimide is defined by Lab color space, b component is set from about −10 to about +10. The disclosure further relates to a copper-clad laminate, a flexible printed circuit, and a method for manufacturing the flexible printed circuit.
Abstract:
This disclosure relates to a printed circuit board comprising a light-pervious insulation layer, a patterned electrically conductive layer and a light-pervious overlay. The patterned electrically conductive layer includes a first black oxide layer, a copper layer and a second black oxide layer. The copper layer includes two opposite surfaces and a plurality of inner surfaces interconnecting the two opposite surfaces of the copper layer. The first black oxide layer is formed on one of the surfaces, and the second black oxide layer is formed on the other surface and the inner surfaces. The patterned electrically conductive layer is arranged on the light-pervious insulation layer. The light-pervious overlay is arranged on the second black oxide layer. A method for manufacturing the printed circuit board is also provided in this disclosure.
Abstract:
A circuit board for radio transceiving includes a flexible base and an inductance unit. The flexible base has a first conductive hole. The inductance unit includes a first inductance coil located at a first side of the flexible base and a second inductance coil located at an opposite side of the flexible base from the first inductance coil. The first inductance coil surrounds the first conductive hole and extends in a spiral direction and turn-by-turn into the first conductive hole. The second inductance coil surrounds the first conductive hole and extends in a spiral direction and turn-by-turn out from the first conductive hole. The first inductance coil and the second inductance coil are electrically connected with each other via the first conductive hole through the flexible base.
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 heat dissipation device includes a first copper sheet and a second copper sheet. The first copper sheet includes a number of first recesses and the second copper sheet includes a number of corresponding second recesses. The second copper sheet is fixed on the first copper sheet and an airtight receiving cavity is formed by each first recess and each the second recess, a working fluid in the airtight receiving cavity carries unwanted heat away.
Abstract:
A flexible printed circuit board (PCB) used for near field communication and a method for manufacturing the flexible PCB are provided. The flexible PCB includes an insulating layer; a first conductive circuit layer adhered on a surface of the insulating layer, the first conductive circuit layer includes at least one first conductive circuit arranged as spiral-shaped and defines a plurality of first spaces; a first resin layer is adhered on a surface of the insulating layer and fills the first spaces; and a first cover layer adhered on a surface of the first resin layer and a surface of the first conductive circuit layer away from the insulating layer.
Abstract:
A flexible printed circuit board includes a flexible printed circuit unit and an electromagnetic shielding structure. The flexible printed circuit unit includes a base layer and a first circuit layer formed on a surface of the base layer. The electromagnetic shielding structure includes a first insulating layer and a copper layer. The first insulating layer is adhered on a surface of the first circuit layer away from the base layer. At least one blind hole is defined in the electromagnetic shielding structure. The copper layer is electrically connected to the first circuit layer by a plating structure filled in the blind hole.
Abstract:
A printed circuit board with circuit visible includes a wiring layer, a first adhesive layer, a first dielectric layer, and a cover film, which are stacked in described order, the wiring layer comprising at least one electrical contact pad. The cover film has at least one opening corresponding to the electrical contact pad. The cover film includes a second dielectric layer and a second adhesive layer. A flow initiation temperature of the first adhesive layer is in a range from 85 degrees centigrade to 90 degrees centigrade, and a hardening temperature of the first adhesive being lower than 150 degrees centigrade.