The PROTEL99 electrical layer is divided into two types, the positive layer and the negative layer. These two layers have completely different properties and usage methods.
The high precision of printed circuits refers to the use of fine line width/pitch, micro holes, narrow ring width (or no ring width), and buried, blind holes and other technologies to achieve high density. The high precision means that the result of "fine, small, narrow, thin" will inevitably bring high precision. Take the line width as an example: O.20mm line width, and O.16-0.24mm is qualified according to the regulations. The error is (O.20 soil 0.04) mm; and the line width of O.10mm, the same error is (0.10±O.02) mm, obviously the accuracy of the latter is doubled, and so on is not difficult to understand. Therefore, the high precision requirements are not discussed separately. But it is a prominent problem in production technology.
7. Solder mask 8. BGA plug hole 9. Network comparison 10. Character layer
4. Drilling Editing 5. Drilling Outline Drawing 6. Circuit Layer
1. Shape 2. Orig 3. Matrix