Circuit board structure and its manufacture method

Abstract

The invention relates to a circuit board structure and a manufacturing method thereof, which comprises the following steps: a bearing device is provided as an insulation plate which has a metal layer on a surface; an insulation protection layer is formed on the bearing device and a plurality of openings are formed in the insulation protection layer for discovering the metal layer; a circuit structure is formed in the surface of the insulation protection layer and in the openings to electrical connect the circuit structure with the metal layer; a dielectric layer is formed on the insulation protection layer and on the circuit structure and a plurality of openings are formed on the dielectric layer, thus exposing part of the circuit structure. The bearing device can be removed then for forming a circuit plate without a chip layer, thus reducing the circuit plate thickness and being conducive to decreasing the size of the sealed products and enhancing the performance so as to go in line with the development trend of miniaturization of electrical products.

Description

technical field [0001] The invention relates to a circuit board structure and a manufacturing method thereof, in particular to a circuit board structure without a core layer (core) and a manufacturing method thereof. Background technique [0002] With the development of semiconductor packaging technology, different packaging forms have been developed for semiconductor devices. Traditional semiconductor devices mainly install a semiconductor component such as an integrated circuit on a package substrate or a lead frame, and then The semiconductor component is electrically connected to the packaging substrate or the lead frame, and then packaged with glue. Among them, Ball grid array (BGA), such as PBGA, EBGA, FCBGA, etc., is an advanced semiconductor packaging technology, which is characterized in that a packaging substrate is used to place semiconductor components, and automatic alignment (Self- Alignment) technology to implant a plurality of solder balls arranged in a grid...

AI Technical Summary

Problems solved by technology

[0007] However, in the above-mentioned method for manufacturing a multi-layer circuit board, the insulating layer structure with a thin metal layer on the surface is used as the core layer (core), and the circuit is manufactured on the core layer to form a core circuit board, and then Layer-up manufacturing can also be performed on the core circuit board to form a multilayer circuit board with the required electrical design, thus making it difficult to effectively reduce the thickness of the final multilayer circuit board, which is not conducive to the development of miniaturized semiconductor packaging structures trend

If the thickness of the core layer is reduced to ultra-thin, for example, below 60 μm, the productivity of multilayer circuit boards will face severe challenges, and the manufacturing yield of circuit boards will be greatly reduced

[0008] In addition, the core circuit board has more plug holes and brushing manufacturing processes in the manufacturing method, which will increase the manufacturing cost of the circuit board

It is especially important that many plated through holes (PTH) are formed in the core circuit board, and the diameter of the general plated through hole (PTH) is about 100 μm or more, and it is formed by etching the metal layer. The diameter of the blind hole is about 50 μm, and it can be formed by electroplating circuit. Therefore, comparatively speaking, the production of the electroplating via hole is not conducive to the formation of thin circuit structure.

[0009] Furthermore, in the above-mentioned multilayer circuit board manufacturing method, a core circuit board needs to be prepared first, and then a dielectric layer and a circuit layer are formed on the core circuit board to complete, thus making the manufacturing steps complicated and increasing the manufacturing time , and the manufacturing cost will increase accordingly

[0010] Therefore, how to provide a circuit board structure and a manufacturing method thereof to avoid defects in the prior art such as increased circuit board thickness, low wiring density, low manufacturing yield, complicated manufacturing methods, increased manufacturing time and manufacturing costs, etc. Become a technical problem to be overcome urgently in this technical field

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