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PI protective film uncovering method of rigid-flex printed circuit board

The invention relates to a PI protective film uncovering method of a rigid-flex printed circuit board, which is suitable for uncovering more than 6 layers of rigid-flex printed circuit boards, and comprises the following steps of manufacturing PP by using a high-gummosis prepreg, burning out a slot with a certain slot width by using a UV laser machine to perform PP windowing, enabling the PP windowing to be located at two sides of the rigid-flex boundary and dividing the rigid-flex boundary into two parts, when the copper layer corresponding to the PP is used for manufacturing a circuit, completely etching off the copper sheet corresponding to the area 0.4 mm away from the inner edge of the PP, attaching a PI protective film to the bottom of the PP on the bottommost layer, enabling the PIprotective film to be located in the flexible board area and be 0.25 mm away from the rigid-flex boundary, sequentially stacking and pressing the PI protective film, at least one layer of PP and a layer of copper foil on the flexible board to which a covering film is attached, conducting outer layer manufacturing, and in the outer layer manufacturing process, conducting depth-controlled uncoveringthrough a CO2 laser procedure after character printing. The PI protective film uncovering method of the rigid-flex printed circuit board has the advantages of being high in efficiency, good in quality and the like.
Owner:GUANGDONG KINGSHINE ELECTRONICS TECH CO LTD

Optical Fiber Access Network and Commuication Protection Method Thereof

The present invention relates to an optical fiber access network and a communication protection method thereof. The optical fiber access network comprises an optical fiber communication system, a wireless communication system, a communication service switch device (8), a second optical network unit (6) and protection optical fiber (91, 92). The protection optical fiber (91, 92) is used to protect the optical fiber line between the optical line terminal (1) and the optical branching divider (2) in the optical fiber communication system. At the same time, the wireless communication system is introduced to protect the optical fiber between the optical branching divider (2) and the optical network unit (3) in the optical fiber communication system. The protection optical fiber or the wireless communication system is used to protect the communication service respectively when there is a broken failure between the optical line terminal (1) and the optical network unit (3) in the optical fiber communication system. This invention overcomes the limit of the resource, such as pipe, cable, and so on. It can protect communication service of the optical fiber communication system efficiently, and improve the bandwidth utility of the communication system.
Owner:CHINA MOBILE COMM GRP CO LTD
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