Recognition mark, and circuit substrate manufacturing method
A technology of identification marks and manufacturing methods, applied in the field of identification marks
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[0122] first as Figure 1A As shown, the release films 2a, 2b are attached to the front and back surfaces of the prepreg 1 using a laminating device.
[0123] The prepreg 1 uses a base material formed of a composite material such as wholly aromatic polyamide fiber or glass fiber cloth of a nonwoven fabric impregnated with a thermosetting epoxy resin. A laminating device is used to bond a plastic film having a release layer portion formed on the front and back surfaces of the prepreg 1 , for example, release films 2 a , 2 b made of polyethylene terephthalate or the like.
[0124] Secondly, if Figure 1B As shown, via holes 3 serving as internal via holes are formed by laser processing or the like. At this time, while forming the via hole 3 for the product (that is, for interlayer connection), the via hole 7a, 7b for the lamination identification mark not filled with the conductive paste 4 described below is formed by laser processing, and the via hole 7b for the thermal press...
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