How to distinguish "through hole oil cover" and "through hole window opening" in PCB design?
Author:Sun Ying Time:2021-06-11 14:37 Browse(878)
How to distinguish "through hole oil cover" and "through hole window opening" in PCB design, Touch screen and OLED Forum
On the point of "opening windows through holes" and "covering oil through holes" (the usage difference between pad and via), many customers and design engineers often ask what this means when placing orders on the system, and which option should I choose for my file? This problem is explained as follows: 8 ~ (I (h0m2a4b: P + s) b0v7 I9 p; V1 Q5 H' qSometimes conductive holes are treated with pad attributes, and sometimes keyholes are treated with via attributes. The design of via attributes and pad attributes is confused, which leads to wrong processing. This is also one of the common complaints.

How to distinguish

for circuit board manufacturers,
when processing CAM data, Some film engineers make mistakes because of the nonstandard design documents of customers; Occasionally, some engineers help customers to modify the documents, correct the non-standard design, and process the engineering data based on their own experience, which leads to and encourages the non-standard design of customers.
in this way, the design of customers is not standardized# |! U    T2 '# l0 T2' * X & ^: all engineers must pay attention to the design standards and specifications.
please all processing engineers.
keep the status quo of customer documents as far as possible, and handle them according to the design specifications and standards instead of experience.
reflect the problems.
this can be a reference for all design engineers, Improve design quality and reduce problems!! W( K1 I! A+ w$ q5 b/ N/ l) J1 _ 7 a1 e/ d, z9 iThis article mainly explains the connection between conductive hole, keyhole, PROTEL / pads / and Geber file.
the paper introduces the connection between conductive hole, keyhole, PROTEL / pads / and Geber fileConductive hole.
via keyhole, pad is particularly prone to several problems: 4 K8 R:} # z7 [8][& S: b) S" x. m( K1 z/ z8 B5 i-Q. D + \ # V3 B1, via in the conversion process, because the design is not standard or the design engineer is not clear about the conversion Gerber setting rules, which leads to problems.
in the process of conversion, Q. D + \ # V3 B1, via have some problems) ^7 M- s* E! Q- b! V5 Y* t5 c( [3 U1 U( O) s/ N4 B( c9 aWhen you send a Gerber file,
the manufacturer can't tell which is a via and which is a keyhole, then the only thing that can be recognized is to process according to the file, where there is a welding layer, there will be a window.
point of dispute: I want to cover the oil on the via.
now that the window is opened, it may cause a short circuit.
when this kind of problem occurs.
you need to check the file, because the Gerber is a film file, The factory has no way to check whether it is conductive hole or keyhole, check whether there is welding aid layer in Gerber file, if there is, open the window, if not, cover the oil.
the factory has no way to check whether it is conductive hole or keyhole3 c" d    L: H- e' i9 r3 @4 `% a    J8 X$ c   [& H2. The mixed use of pad and via causes problems.
(I - | "R0 e # B (M & Q1 E)' _" Y9 t * f $g'k when the file is pads or Protel, it will be sent to the factory.
it is required that the through hole cover oil should be paid attention to. You should carefully check whether the plug-in hole (PAD) also uses via,Otherwise, the plug-in hole will also be covered with green oil, which will lead to the failure of welding.
point of dispute: the plug-in hole must be sprayed with tin.
how to cover the oil? In the same case, check the file first, whether it is designed by pad or via.
7 m + G & D. m! G/ L. F9 Z2 k- d7 h! U& S: V3 `& O" [When the file is pads or Protel, it will be sent to the factory.
the order requirement is through hole cover oil, but many customers use pad (plug-in hole) to represent conductive hole, which leads to the opening of conductive hole window.
maybe what you want is through hole cover oil.
at that time, the point of dispute may be: what I want is through hole cover oil, why do I open the window, At this time, check whether the file design is standard.
4 F / f $m * O7 n. I / D "d&K9 K '@: Q0 a) X-B: X:' jiepei PCB proofing factory aims at this point.
it is hereby explained that if it is via, it will be treated as via, if it is pad, it will be treated as pad.
because no one will know which is conductive hole.
which is plug-in hole, and via and pad are the only identification, please know.
this is the case.
K: k2 f2 X8 N' t8 ~    q6 _ 1 P0 F) v, l3. How to design through hole cover oil in Protel or pads( o   ^   W% c    t2 |2 D0 C1 b! j# B+ |. I! u   [ 1 ~ in Protel, there is a tent option in the via attribute. If it is checked,It must be covered with oil, then all the gbrber files transferred out are covered with oil; In pads, the purpose of transferring pads file is to cover via. When outputting soldermask, that is, solder mask layer, just check the "soldermask top" - via below, which means all the via windows are opened. If not, the via is covered.
in this paper, the method of transferring pads file to via is introduced/ B; x5 P* T2 `) [( K9 I9 M' F* ^! C# V+ [2 M* vTo sum up: pad is done by pad.
its attribute is plug-in hole; Via has two options. If the original file is provided, you can choose when placing an order. If the Gerber file is provided, please check whether the Gerber file meets your requirements! ) C4 N6 e: ]0 h+ _% T& d& N5 P$ v# S/ N* R: P( d6 G1 y.
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