Rigid-flex combined circuit board and manufacturing method therefore

Abstract

The invention discloses a rigid-flex combined circuit board and a manufacturing method of the rigid-flex combined circuit board. The rigid-flex combined circuit board is made of flexible copper clad laminates, rigid substrates, covering film, prepregs and rigid filling boards. One part of the flexible copper clad laminates are used as flexible boards, and the other part of the flexible copper clad laminates are combined with the rigid substrates through the prepregs to be used as outer-layer rigid boards; the inner-layer flexible copper clad laminates and the prepregs of the rigid substrates are bonded, the prepregs of an inner-layer flexible circuit board are bonded, holes are drilled on the rigid substrates, and flexible areas are punched and cut; boards with the same sizes of the flexible areas are milled out of the filling boards; the inner-layer flexible circuit boards are combined to from a whole through the prepregs bonding the inner-layer flexible circuit boards and are laminated and solidified, each prepreg combines the inner-layer flexible circuit boards, the rigid substrates, the filling boards and the outer-layer flexible copper clad laminates to form a whole to be laminated and solidified, follow-up processing is conducted, laser cutting is conducted on the flexible areas of the outer-layer flexible copper clad laminates, appearance processing, filling board removing and other conventional process production are conducted, and therefore manufacture of the rigid-flex combined circuit board is finished.

Description

technical field [0001] The invention relates to a rigid-flex combined circuit board and a manufacturing method thereof, in particular to a rigid-flex combined circuit board with a rigid outer layer. Background technique [0002] With the development of electronic science and technology, more and more electronic products are becoming "light, thin, and portable". A certain mechanical strength must also have a certain softness requirement. Rigid-flex circuit boards, also known as rigid-flex circuit boards, refer to printed circuit boards containing one or more rigid regions and one or more flexible regions, which have the flatness, mechanical strength and The flexibility and flexibility of flexible circuit boards. Rigid-flex circuit boards can connect circuits located on different planes, which is very conducive to the utilization of space, and is especially suitable for applications in precision electronics such as portable electronic products. [0003] At present, the comm...

AI Technical Summary

Problems solved by technology

[0032] 1. Rigid copper clad laminates 8 and 9 are both double-sided copper foils. To make the outer hard board of this soft-rigid circuit board, only one side of copper is needed, and one side of the copper needs to be etched away, which wastes one side of copper and increases the process. high cost

[0033] 2. The flexible area 15 of the soft-rigid board is protected by rigid filler boards 10 and 11, and there will be gaps between it and the rigid copper-clad laminate. Inaccurate, during the production process, especially when going through the DES line, copper plating and other wet processes, the liquid medicine will penetrate into the flexible circuit board in the flexible area 15, causing abnormalities in the inner layer, especially the flexible circuit board in the flexible area 15. There are pads on the circuit board, and the pads may be etched when passing the DES line. The traditional method of making rigid-flex circuit boards is not suitable for rigid-flex circuit boards with pads on the flexible area.

[0034] 3. In the copper plating process, there is a hidden danger of Tibetan medicine water and excess copper skin polluting the medicine tank in the gap between the rigid filler boards 10, 11 and the rigid copper clad boards 8, 9;

[0035] 4. When the rigid filler boards 10 and 11 in the flexible area 15 are taken out after the shape processing, because the prepregs 1, 6, and 7 are bonded to the flexible circuit board in the flexible area 15 on the edge, it needs to be picked up with a sharpener. Time-consuming, if the force is excessive, it is easy to tear the flexible circuit board

[0036] 5. There are semi-cured traces on the edge of the flexible circuit board in the flexible area 15, which is not beautiful in appearance

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