Patent ID: 11937377
Assignee: SHENNAN CIRCUITS CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. The circuit board preparation method according to claim 1, before the obtaining the to-be-processed plate, further comprising:
obtaining a copper-clad plate; defining at least one hole at a set position of the copper-clad plate by drilling, wherein each of the at least one hole comprises a micro-blind hole and/or a through hole; and hole-treating the at least one hole to obtain a to-be-treated plate;
applying a first photosensitive film on a surface of a first copper layer and a surface of a second copper layer of the to-be-treated plate, respectively; leaving a first predetermined position on the first photosensitive film exposed; performing hole-filling plating for the first predetermined position of the to-be-treated plate to form the first tab at the first predetermined position; and removing the first photosensitive film from the to-be-treated plate; and
attaching a second photosensitive film to a second predetermined position of the to-be-treated plate, and etching the to-be-treated plate to form a conductive line on the to-be-treated plate; removing the second photosensitive film on the to-be-treated plate to obtain the to-be-processed plate.