Abstract: An embodiment of the present invention relates to a flexible printed circuit board (FPCB), which is applied to various electronic display devices, and may provide the FPCB, including a base, a first metal layer and a second metal layer on both surfaces of the base, a first plating layer on the first metal layer, a second plating layer on the second metal layer, and a first insulating pattern and a second insulating pattern respectively disposed on some region of the first plating layer and the second plating layer, wherein the first plating layer and the second plating layer may have different thicknesses.

Abstract: A flexible circuit board and an electronic device including a flexible circuit board are provided. The flexible circuit board may include a substrate having a bending area and a non-bending area, a wiring pattern layer provided on the bending area and the non-bending area, a plating layer provided on the wiring pattern layer and including an open area in an area corresponding to the bending area, and a protective layer that directly contacts one surface of the wiring pattern layer exposed at the open area and a side surface of the plating layer. The protective layer may have a larger thickness than a thickness of the plating layer.

Abstract: Disclosed is a sliding mechanism for opening and closing a cellular phone. The mechanism includes a main plate, a slider plate slidably connected to the main plate, a first block shaft-rotatably fixed to the main plate, one or more first rod member fixed to the first block, a first resilient member connected to the first block and generating expansion force, a second block shaft-rotatably fixed to the slider plate, one or more second rod member fixed to the second block, a second resilient member connected to the second rod member and generating expansion force, and a connection block placed in the central area of the first and second blocks and supporting the end portions of the first and second resilient members. The connection block slidably connects the first and second rod members with the first and second blocks in such a way that the end portion of the first rod member is directed towards the second block and the end portion of the second rod member is directed towards the first block.

Abstract: A method of forming an oxide layer on a powder metal part includes subjecting the powder metal part to a steam oxidation process. An oxide layer is formed on the powder metal part. The oxide layer has a thickness greater than 7 microns.