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How to create negative artwork or pdf?

Usane

 Hi!

 

First, sorry for my bad english.

I'm not an allegro expert, i use it rarely.

I'm using allegro PCB Editor 16.5. So far i used positive artwork files and pdf-s in my designs for positive pfotoresist technology.

Now i have to crate artworks or pdf files for negative photoresist etching.

Of course it is simple if i just convert from positive to negative, but thats a big black film if there is little net.How can i create a negative file if i want to print only the clearance on the copper pour? I don't know if i am understandable or not. 

I placed a dynamic shape on my old designs, and on the screen it looks good, but thats still positive. If i change the layer to negative then the clearance disappear between the lines and the shape and everything is merge into the plane.

Is there a solution?

 

  • Usane

     Noone has a solution?

    Well  then, at least can someone tell me how to set up the dynamic shape to be solid like the cline?Now if i zoom in it is dashed. If i could fill it solid, then i could inverse the black-white by photoshop.

  • chads108

    I will try to help, but I need to see if I understand what you are trying to do.  Do you want to print a PDF of a negative artwork layer, but have it look like a positive layer? 

    What is the reason for using negative artwork layers?  No much reason for that anymore simply because file size isn't really an issue anymore and it makes things more complicatedby having to have flash symbols for pins and vias, etc.

    Chad

  • Usane

     Somelike that.

    I try to describe the reason.  So far i desgned the circuits in positive way. I didn't care the etching process, because it was made by pcb making company. Now i making the test pcb myself, and i use dry-film. Printing a film for this is eating the ink, so i decedid to remake the old designs, and make the new ones from copper pour layers, and etch only the clearing between the lines and the shape. Its still waste of ink unless i can inverse the film. For example if you know the sprint layout, it can print in inverse. Is there a way in orcad pcb editor to make this?

    Id like to crate like this: http://cdn.instructables.com/FDN/SG9U/FRD86HXH/FDNSG9UFRD86HXH.LARGE.jpg

  • chads108

    Don't know if I can help now.  You said you were using AlLegro PCB Editor in your first post, but now are stating that you are using OrCAD PCB Editor.  I am not familiar with the OrCAD editor.  I know in Allegro you can create the gerber files and then import them back in to Allegro, at which time you should be able to print them out as what they would look like in the actual artwork films.  Don't know if that is the same for OrCAD.

    Chad

  • Usane

     Sorry if i was confusing. I use allegro. I sain orcad only because the allegro is in the orcad package and i get used to say its orcad, but i think almost the same.

    I will try your suggestion, i hope it help. I dont want to learn an other pcb designer software, especially my old designs created in allegro.

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