Rigid-flexible printed circuit board capable of improving discoloration of brownification layer of multilayer flexible core board and manufacturing method of rigid-flexible printed circuit board

Abstract

The invention relates to the technical field of PCB manufacturing, and discloses a rigid-flexible combined board capable of improving discoloration of a brownification layer of a multilayer flexible core board and a manufacturing method of the rigid-flexible combined board. The rigid-flexible board comprises at least one inner-layer core board and a single-side copper-clad plate arranged on one side or two sides of the inner-layer core board. A layer of covering film attached to the copper surfaces is arranged between the copper surfaces of every two adjacent inner-layer core plates, and a cavity area is arranged between the covering films. A covering film is also arranged on the copper surface of one side, close to the single-side copper-clad plate, of the inner-layer core plate, a cavity area is also arranged on one side, far away from the inner-layer core plate, of the covering film, and a heat insulation material layer is arranged on the outer side of the cavity area of the covering film on the copper surface of one side, close to the single-side copper-clad plate, of the inner-layer core plate. According to the invention, heat insulation is carried out on the cavity area through the heat insulation material layer, close to the copper surface cavity area of the single-side copper-clad plate, of the inner core plate, so that the corresponding copper surface keeps a relatively balanced temperature difference, uneven heating is avoided, and poor color difference caused by the fact that brownification characteristics are influenced by temperature difference is improved.

Description

technical field [0001] The invention relates to the technical field of PCB manufacturing, in particular to a rigid-flexible board for improving the discoloration of the browning layer of a multilayer flexible core board and a manufacturing method thereof. Background technique [0002] Usually, under the cover film of multiple flexible core boards in the inner layer of the rigid-flex board is a large copper surface circuit. The surface treatment before pressing the cover film is browning treatment, which will go through many times in the subsequent processing process. High temperature treatment, due to the characteristics of the browning potion, the copper surface under the covering film will have color differences due to uneven heating, resulting in defective products, such as figure 1 shown. Contents of the invention [0003] The technical problem to be solved by the present invention is to solve the problem of color difference of the large copper surface circuit under t...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problem of color difference of the large copper surface circuit under the inner cover film of the existing rigid-flex plate due to uneven heating

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