Flexible circuit board

Abstract

The invention provides a flexible circuit board. A part of the flexible circuit board adopts a hard base material, and includes a hard substrate, a first heat dissipating insulating adhesive layer is arranged on the hard substrate, a first circuit layer is arranged on the first heat dissipating insulating adhesive layer, a first insulating solder mask is arranged on the first circuit layer, the other part of the flexible circuit board adopts a flexible base material, and includes a first flexible base material layer, the first circuit layer extends from the first heat dissipating insulating adhesive layer of the hard substrate to an upper surface of the fixable base material layer, and a lower surface of a part of the flexible base material layer is connected with an upper surface of the hard substrate through the first heat dissipating insulating adhesive layer. In the flexible circuit board provided by the invention, the flexible base material and the hard base material are combined together, can be bent, and can be also applied to a circuit board that requires good heat dissipation, in mounting, welding can be performed directly on the hard substrate, which is simple and convenient, and an existing heat dissipation device of an automobile tail light can be improved.

Description

Technical field: [0001] The invention relates to the technical field of circuit board manufacturing, in particular to a flexible circuit board. Background technique: [0002] There are two types of circuit boards in the prior art. One is a hard circuit board, which generally uses an aluminum substrate, and then makes a circuit layer with copper foil on the aluminum substrate, and then makes an insulating solder resist layer on the circuit layer. This kind of circuit board can be fixedly installed on the product by welding, but this kind of circuit board cannot be bent, and once bent, it will be basically damaged, so it cannot be installed against non-flat mounting surfaces, such as curved surfaces, stepped surfaces and other irregularities. Regular mounting surface. There is also a flexible circuit board, which generally uses a PI soft base material layer as the base material layer, and then sets copper foil on the soft base material layer as the circuit layer, and then mak...

AI Technical Summary

Problems solved by technology

This kind of circuit board can be fixedly installed on the product by welding, but this kind of circuit board cannot be bent, and once bent, it will be basically damaged, so it cannot be installed against non-flat mounting surfaces, such as curved surfaces, stepped surfaces and other irregularities. regular mounting surface

There is also a flexible circuit board, which generally uses a PI soft base material layer as the base material layer, and then sets copper foil on the soft base material layer as the circuit layer, and then makes an insulating solder resist layer on the circuit layer. The circuit board can be bent to be attached to the surface of the product to be installed, but because it is a flexible material, it is troublesome to fix it on the surface of the product, and it is difficult to fix it by welding, and the substrate of this flexible circuit board The material is generally non-metallic, and the heat dissipation effect is relatively poor, especially for the flexible circuit board applied on the luminous lamp, the heat dissipation problem will be more prominent

Especially for the heat dissipation device of the car taillight, if the flexible circuit board is used, the heat dissipation is not good, and if the hard circuit board is used, it is not easy to install due to the curve of the car taillight

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