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... procedure. It soon became obvious that the solution to such a complex task required the inter- disciplinary linking of CNC technology skills provided by | PCB INDUSTRY | the Lenz Company, the Frauenhofer Institute’s optoelectronic know-how, as well as our production experience. The Revolution. To end the suspense, the core procedure is a | PCB INDUSTRY | fundamentally ingenious idea, whereby a 15 mm line is added to all four corners of the layoput of each individual Multilayer Panel. Should movements between | PCB INDUSTRY | the layers occur during the pressing process, the difference in alignment is so minimal that it is barely perceivable. If the ML-Panel are applied on | PCB INDUSTRY | a CAMELOT processing station, the corners are exposed by an oblique section and measured by means of a high resolution image analysis system. From this | PCB INDUSTRY | information, the computer creates a three-dimensional map of the circuit structure image concealed beneath the copper foil. This data enables either the best possible positioning | PCB INDUSTRY | of pinning holes for further ...
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... the way of capability checking within the tool. As a result, these are among the more troublesome layers for fabricators. The solution here is | PCB INDUSTRY | a fabrication analysis tool that can handle such issues as clearances, coverage, webbing, and so forth. For instance, most fab shops want the largest possible | PCB INDUSTRY | | CLEARANCES | in a solder layer so that mask doesn't end up on pads. On the flip side, copper is not supposed to be | PCB INDUSTRY | exposed. The two requirements - no mask on pads and unwanted exposed copper - must be balanced. It is not easy to do. How can | PCB INDUSTRY | the designer help? Devise a standardized clearance, or set the clearances at 1:1, and let the shop do the soldermask enhancement. Here's another issue: | | PCB INDUSTRY | THE SOLDERMASK | webbing between pads on fine-pitch surface mount devices. Most masks can go to 0.003" without the resist flaking off. However, if the | PCB INDUSTRY | pads are so tightly grouped that the dams between them are less than 0.003", it's better to construct a mask opening over the entire group. | PCB INDUSTRY | That ...
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... important criteria is the presence of orientation marks within the boundary of board. These marks could be the board reference so long as it | PCB INDUSTRY | cannot be read from the other side. (This is for your protection to prevent the boards made inside out). | IMAGES | should comply with | PCB INDUSTRY | design rules that will result in a board that will meet performance and cost requirements. - | SCALE MUST BE GIVEN, | tapes securely stuck | PCB INDUSTRY | to the backing sheet, track to pad & track to track joints complete and the backing sheet clean. - Scale must be given and be | PCB INDUSTRY | at least 2:1. Plots must also offer sharp edge definition and traces dense enough for blocking light when photographing. - Preferred on 7mil (178mm) thick | PCB INDUSTRY | base for stability. Films should be plotted on laser photoplotter or on vector photoplotter using a minimum resolution of ½mil (13mm). - Preferred in Gerber® | PCB INDUSTRY | format although accepted in other formats. (Refer to CID- 014 for information on Documentation in Digital Form). - files are the only ...
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