Method for manufacturing negative film circuit board with stepped circuit
A manufacturing method and a technology of circuit boards, which are applied in the manufacture of printed circuits, removal of conductive materials by chemical/electrolytic methods, printed circuits, etc., can solve the problems that circuit boards with stepped circuits cannot be produced, and negative film processes cannot produce stepped circuits. , to achieve the effects of ensuring the bonding force and exposure accuracy, optimizing the process parameters of the film, and optimizing the process parameters
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Example Embodiment
[0022] Example 1
[0023] This embodiment provides a method for manufacturing a negative circuit board with a stepped circuit. The outer circuit on the negative circuit board includes a thin copper circuit and a thick copper circuit. The copper thickness of the thick copper circuit is 2oz, and the copper of the thin copper circuit The thickness is 1oz, the line width and line gap are 4mil / 4mil, and the tolerance of the line width and line gap is ±3μm. Specific steps are as follows:
[0024] (1) Cutting: The core board is cut out according to the size of the panel 520mm×620mm, the thickness of the core board is 0.5mm, and the thickness of the copper layer on both surfaces of the core board is 0.50Z.
[0025] (2) Inner layer circuit production (negative film process): inner layer pattern transfer, use a vertical coating machine to coat the photosensitive film, the film thickness of the photosensitive film is controlled to 8μm, using a fully automatic exposure machine, with 6-8 grid ex...
Example Embodiment
[0043] Example 2
[0044] This embodiment provides a method for manufacturing a negative circuit board with a stepped circuit. The outer circuit on the negative circuit board includes a thin copper circuit and a thick copper circuit. The copper thickness of the thick copper circuit is 2oz, and the copper of the thin copper circuit The thickness is 1oz, the line width and line gap are 4mil / 4mil, and the tolerance of the line width and line gap is ±3μm. The specific steps are basically the same as those in Example 1, except that the pressing parameters used in step (9) of the outer layer pattern 2 are the pressing parameters for bonding the dry film to the production board by fast pressing: The temperature is 120℃, the pressure is 0.5MPa, and the speed is 1.0m / min.
[0045] In the same batch of circuit boards (50 sheets in total) prepared by the method of this embodiment, 5 circuit boards have problems such as open circuits and circuit gaps due to the penetration of the etching solu...
Example Embodiment
[0046] Example 3
[0047] This embodiment provides a method for manufacturing a negative circuit board with a stepped circuit. The outer circuit on the negative circuit board includes a thin copper circuit and a thick copper circuit. The copper thickness of the thick copper circuit is 2oz, and the copper of the thin copper circuit The thickness is 1oz, the line width and line gap are 4mil / 4mil, and the tolerance of the line width and line gap is ±3μm. The specific steps are basically the same as those of Example 1, except that the etching in step (10) is as follows: acid etching the production board to remove the copper layer on the exposed copper surface, and then stripping the film to obtain the outer layer circuit; acid etching The parameters used are: acidity 2.0-3.0N, Cu 2+ The concentration is 110-150g / L, NaClO 3 The CAP value is 20-60, the temperature is 50±2℃, the etching speed is 2.0-7.0m / min (the transmission speed of the production board in the etching cylinder, the l...
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