Ko te kopare tarai, e mohiotia ana ko te kopare aukati peita, he mea angiangi te polymer e whakamahia ana Poari PCB ki te aukati i nga hononga totohu mai i te hanga Piriti. Ka aukati hoki te kopare aukati i te waikura me te pa ki nga tohu parahi i runga i te papa PCB.

What is PCB solder resistance type? The PCB welding mask acts as a protective coating on the copper trace line to prevent rust and prevent solder from forming Bridges that lead to short circuits. E 4 nga momo maaka o nga kopare kikii PCB – te wai epoxy, te whakaahua waipiro, te whakaahua maroke, me nga kopare o runga me raro.

E wha nga momo kanohi kanohi maitai

He rereke nga kopare paiherea i te hanga me nga rawa. Me pehea, ko tehea te kanohi maitai e whakamahia ana hei ki te tono.

Runga me te taupoki taha o raro

Runga me te Raro o te aukati kanohi e whakamahia ana e nga miihini hiko ki te tautuhi i nga tuwhera o te reanga paraka pounamu. Ko te paparanga kua taapirihia e te epoxy resin te hangarau kiriata ranei. Ka honoa nga titi waahanga ki te papa ma te whakamahi i te tuwhera kua rehitatia ki te kopare.

The conductive trace pattern on the top of the circuit board is called the top trace. He rite ki te maaka o runga, ko te maaka o raro e whakamahia ana i te taha whakamuri o te papa ara iahiko.

Epoxy kopare rewa wai

Epoxy resins are the cheapest alternative to welding masks. Epoxy is a polymer that is screen printed on a PCB. Ko te taarua mata tetahi mahi taarua e whakamahi ana i te kupenga papanga hei tautoko i te tauira aukati waituhi. The grid allows identification of open areas for ink transfer. In the final step of the process, heat curing is used.

He kopare whakairinga whakaahua whakaata whatu

Ko nga kopare whakaahuru-a-wai, e mohiotia ana ko LPI, he ranunga e rua nga wai rereke. Liquid components are mixed prior to application to ensure a longer shelf life. It is also one of the more economical of the four different PCB solder resistance types.

Ka taea te whakamahi i te LPI mo te taatai ​​mata, peita peita, peihana rehu ranei. The mask is a mixture of different solvents and polymers. I te mutunga, ka taea te tango i nga koti angiangi e piri ana ki te mata o te rohe whaainga. I hangaia tenei kopare hei hipoki kanohi, engari kaore e hiahiatia e te PCB tetahi o nga whakakikorua whakakikorua whakamutunga e waatea ana i tenei ra.

He rereke ki nga waituhi epoxy tawhito, he ngawari te LPI ki te rama ultraviolet. Me hipoki te röpaki ki te kanohi kanohi. I muri i te “huringa whakaora” poto, ka kitea te poari ki te rama ultraviolet ma te whakamahi i te whakaahua whakaahua, i te raima ultraviolet ranei.

Before applying the mask, the panel should be cleaned and free of oxidization. Ka mahia tenei ma te awhina o nga rongoā matū motuhake. Ka taea hoki tenei ma te whakamahi i te otinga alumina, ma te horoi ranei i nga panui ki te kohatu pumice poutoa.

One of the most common ways to expose panel surfaces to UV is by using contact printers and film tools. The top and bottom sheets of the film are printed with an emulsion to block the area to be welded. Use the tools on the printer to fix the production panel and film in place. The panels were then simultaneously exposed to an ULTRAVIOLET light source.

Ko tetahi atu tikanga whakamahi lasers hei hanga whakaahua tika. But in this technique, no film or tools are needed because the laser is controlled using a reference mark on the panel’s copper template.

Ka kitea nga kopare LPI i roto i nga momo tae, tae atu ki te karaariki (matte paku-kikotangi), ma, puru, whero, kowhai, pango, me te maha atu. Ko te umanga LED me nga whakamahinga laser i te umanga hiko e akiaki ana i nga kaihanga me nga kaihoahoa ki te whakawhanake kaha i nga taonga ma me nga pango.

He kanohi maramara whakaahua miihini kanohi kanohi

A dry film photoimagable welding mask is used, and vacuum lamination is used. Ko te kiriata maroke ka puta ka whanakehia. After the film is developed, openings are positioned to produce patterns. I muri i tenei, ka honoa te waahanga ki te papa paraihe. Ka pania te parahi ki runga i te papa hiko i te taha o te hiko.

Ko te parahi he mea papa ki te kohao me te waahi tohu. I te mutunga ka whakamahia te tiini hei tiaki i nga huringa parahi. In the final step, the membrane is removed and the etching mark is exposed. Ka whakamahia hoki e te tikanga te whakaora wera.

Dry film welding masks are commonly used for high-density patch boards. I te mutunga, kaore e ringihia ki roto i te poka-puta. These are some of the positives of using a dry film welding mask.

Ko te whakatau ko te peera tarai hei whakamahi ma runga i nga momo ahuatanga – tae atu ki te rahi o te tinana o te PCB, te tono whakamutunga hei whakamahi, nga kohao, nga waahanga hei whakamahi, nga kaiarahi, te whakatakotoranga mata, etc.

Ko te nuinga o nga hoahoa PCB hou ka taea te tango whakaahua reima hei whakaea i nga kiriata. Therefore, it is either LPI or dry film resistance film. The surface layout of the board will help you determine your final choice. If the surface topography is not uniform, the LPI mask is preferred. If a dry film is used on uneven terrain, gas may be trapped in the space formed between the film and the surface. Therefore, LPI is more suitable here.

Heoi, he raru ke ki te whakamahi i te LPI. Its comprehensiveness is not uniform. You can also get different finishes on the mask layer, each with its own application. For example, in cases where solder reflow is used, the matte finish will reduce solder balls.

Build solder masks into your design

Building a solder resist film into your design is indispensable to ensure the mask application is at the optimal level. When designing a circuit board, the welding mask should have its own layer in the Gerber file. In general, it is recommended to use a 2mm border around the function in case the mask is not fully centered. Me waiho e koe te iti rawa o te 8mm i waenga o nga papa kia kore ai e hanga nga Piriti.

Thickness of welding mask

Thickness Welding mask will depend on the thickness of the copper trace on the board. I te nuinga o te waa, ko te miihini miihini 0.5mm he pai ake ki te kati i nga raina tohu. If you are using liquid masks, you must have different thicknesses for different features. Ko nga waahi laminate kaore he matotoru o te 0.8-1.2mm, i nga waahanga me nga ahuatanga uaua penei i nga turi ka iti ake nga waahanga (mo te 0.3mm).

mutunga

Hei whakarāpopototanga, ko te hoahoa kanohi kanohi taera he raru nui ki te mahinga tono. He mea nui ki te aukati i te waikura me te hono i nga Piriti, ka arahi pea i nga ara poto. No reira, me whai whakaaro to whakatau ki nga ahuatanga rereke i whakahuahia i tenei tuhinga. Ko te tumanako ka taea e tenei tuhinga te awhina i a koe kia maarama ki te TYPE o te kiriata whakahee PCB. Mena he paatai ​​taau, me whakapiri mai ranei ki a maatau, ka koa matou ki te awhina i a koe.