PCB inner Layer Process The PCB layout is designed using a CAD system and exported in the industry-standard Gerber format (RS-274X). These files define the copper layers, soldermasks, and component notations. The PCB manufacturer first verifies that the data meets manufacturing requirements, checking parameters like track widths and hole sizes. Once validated, films for each PCB layer are generated using laser photoplotters. These films are aligned precisely using registration holes to ensure layer alignment. The PCB panel undergoes etching to remove unwanted copper, leaving the desired copper pattern. Finally, the protective photoresist is stripped away to reveal the finished PCB design, with multiple designs often grouped on one panel for cost efficiency.
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