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PCB photolithography steps

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kender

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Folks,

I'm making a write-up for a workshop. The class is on PCB layout, but I want to give students an idea about PCB fabrication too. Is this a the correct step for fabrication with photolithography?

1. Copper clad FR4 substrate – starting point
2. Drill
3. Plate
4. Apply photoresist
5. Expose photoresist
6. Wash off unexposed photoresist
7. Etch
8. Wash off exposed photoresist
9. Soldermask applied
10. Soldermask exposed
11. Unexposed soldermask washed off (leaving exposed pads)

Any references and insight are appreciated!

- Nick
 

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