A method and system for constructing a printed circuit board with multifunctional holes. The upgradeable patch panel assembly including a panel base having an aperture sized to receive a scanner interface cable. Which permitting the transmission of light through the curtain wall sections to the room, and when the curtain is closed the louvers which are made of opaque fabric overlap each other and substantially block the transmission of light through to the room, or when the louvers are made of semi opaque fabric it will decrease the transmission of light through the room. Each movement limiting wall 11 has a wall length equal to or greater than the diameter of the collimator lens 5 to serve as a dust prevention wall, whereby dust can hardly come in and be deposited to result in contaminating the collimator lens 5 and thereby degrading the performance for recording andor reproduction. The base body, which, together with its components is made in one piece from plastic, is elastically pliable in the radial direction. The lubricant of the lubricant layer includes a perfluoropolyether liquid lubricant having an alcohol end group and a perfluoropolyether liquid lubricant having an amine end group of tertiary amine structure.