Afar nooc oo maaskaro alxanka PCB ah

Maaskaro alxanka, oo sidoo kale loo yaqaan maaskaro xannibaya alxanka, waa lakab khafiif ah oo polymer loo isticmaalo Guddiga PCB si looga hortago kala -goysyada alxanka inay samaystaan ​​Buundooyin. Maaskarada alxanka ayaa sidoo kale ka hortagaysa oksaydhka waxayna quseysaa raadadka naxaas ee ku jira guddiga 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. Waxaa jira 4 nooc oo ugu waaweyn maaskaro alxanka PCB – dareeraha epoxy, sawir -qaadista dareeraha, sawir -qallajinta filimka qalalan, iyo maaskaro sare iyo hoose.

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Afar nooc oo maaskaro alxanka ah

Maaskaro alxanka way ku kala duwan yihiin waxsoosaarka iyo maaddada. Sida iyo maaskarada alxanka in la isticmaalo waxay kuxirantahay arjiga.

Daboolka dhinaca sare iyo kan hoose

Maaskaro alxanka sare iyo kan hoose Injineerada elektaroonigga ah ayaa inta badan u adeegsada inay ku gartaan furitaanka lakabka xayndaabka cagaaran. Lakabka waxaa horay loogu daray epoxy resin ama technology film. Musmaarradii qaybtii ayaa markaa lagu xardhay looxdii iyadoo la isticmaalayo furitaan ka diiwaangashan maaskarada.

The conductive trace pattern on the top of the circuit board is called the top trace. Si la mid ah maaskarada dhinaca sare, maaskarada dhinaca hoose waxaa loo isticmaalaa dhinaca dambe ee guddiga wareegga.

Maaskarada dareeraha Epoxy

Epoxy resins are the cheapest alternative to welding masks. Epoxy is a polymer that is screen printed on a PCB. Daabacaadda shaashadu waa hab daabacaad oo adeegsata shabag maro si ay u taageerto qaabka xannibaadda khad. The grid allows identification of open areas for ink transfer. In the final step of the process, heat curing is used.

Maaskaro alxanka sawir -qaadista oo dareere ah

Maaskaro sawir qaade oo dareere ah, oo sidoo kale loo yaqaan LPI, dhab ahaantii waa isku dar laba dareere oo kala duwan. 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.

LPI waxaa loo isticmaali karaa daabacaadda shaashadda, rinjiyeynta shaashadda ama codsiyada buufinta. The mask is a mixture of different solvents and polymers. Sidaas darteed, waxaa la soo saari karaa dahaadho khafiif ah oo ku dhegan dusha gobolka bartilmaameedka ah. Maaskaradaan waxaa loogu talagalay in lagu xiro maaskaro, laakiin PCB -ga uma baahna mid ka mid ah dahaarka ugu dambeeya ee caadiyan maanta la heli karo.

Marka la barbardhigo khariidadihii hore ee epoxy, LPI waxay u nugul tahay iftiinka ultraviolet. Guddigu wuxuu u baahan yahay in lagu daboolo maaskaro. Kadib “wareegga daaweynta” oo gaaban, guddigu wuxuu ku dhacaa iftiinka ultraviolet iyadoo la adeegsanayo fotolithography ama laser ultraviolet.

Before applying the mask, the panel should be cleaned and free of oxidization. Tan waxaa lagu sameeyaa caawinta xalalka kiimikada ee gaarka ah. Tan waxaa kale oo lagu samayn karaa iyadoo la adeegsanayo xal alumina ah ama lagu xoqdo darbiyada dhagaxa laalaaday.

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.

Farsamo kale ayaa adeegsata leysarka si loo abuuro sawirro toos ah. 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.

Maaskarada LPI waxaa laga heli karaa midabyo kala duwan, oo ay ku jiraan cagaar (matte ama semi-gloss), caddaan, buluug, cas, jaalle, madow, iyo in ka badan. Warshadaha LED -ka iyo codsiyada laser -ka ee warshadaha elektiroonigga ayaa ku dhiirrigelinaya soo -saarayaasha iyo naqshadeeyayaasha inay horumariyaan agab cad iyo madow oo xoog leh.

Filim qallalan oo sawir -qaade maaskaro

A dry film photoimagable welding mask is used, and vacuum lamination is used. Filimka qallalan ayaa markaa la soo bandhigaa oo la horumariyaa. After the film is developed, openings are positioned to produce patterns. Intaas ka dib, curiyaha waxaa lagu dhejiyaa suufka brazing. Naxaasta ayaa markaa lagu dhejiyaa guddiga wareegga iyadoo la adeegsanayo hab elektaroonik ah.

Naxaasta waxaa lagu dahaadhaa daloolka iyo aagga raadraaca. Tin ayaa ugu dambayntii loo isticmaalay in lagu caawiyo ilaalinta wareegyada naxaasta. In the final step, the membrane is removed and the etching mark is exposed. Habku wuxuu kaloo adeegsadaa kulaylka daaweynta.

Dry film welding masks are commonly used for high-density patch boards. Natiijo ahaan, kuma shubto daloolka. These are some of the positives of using a dry film welding mask.

Go’aaminta maaskaro alxanka in la isticmaalo waxay ku xiran tahay arrimo kala duwan – oo ay ku jiraan cabbirka jirka ee PCB, codsiga kama dambaysta ah ee la adeegsanayo, daloolada, qaybaha la adeegsanayo, kaariyeyaasha, qaabka dusha, iwm.

Inta badan naqshadaha PCB -ga casriga ah waxay heli karaan filimada iska -caabbinta alxanka sawir leh. 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.

Si kastaba ha noqotee, waxaa jira hoos u dhac ku saabsan adeegsiga 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

Dhisidda filim iska caabin ah oo lagu geliyo naqshaddaada waa lama huraan si loo hubiyo in codsiga maaskaro uu yahay heerkii ugu fiicnaa. 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. Waa inaad sidoo kale ka tagtaa ugu yaraan 8mm inta u dhexeysa suufka si aad u hubiso in Buundooyinka aysan sameysan.

Thickness of welding mask

Thickness Welding mask will depend on the thickness of the copper trace on the board. Guud ahaan, maaskaro alxanka 0.5mm ayaa la doorbidayaa in la daboolo khadadka raadraaca. If you are using liquid masks, you must have different thicknesses for different features. Meelaha laminate-ka madhan waxay lahaan karaan dhumuc ahaan 0.8-1.2mm, halka aagagga leh astaamaha qalafsan sida jilbaha ay yeelan doonaan fidinno dhuuban (qiyaastii 0.3mm).

gabagabeyn

Marka la soo koobo, naqshadeynta maaskaro alxanka ayaa saameyn weyn ku leh shaqeynta dalabka. Waxay kaalin muhiim ah ka qaadataa ka hortagga miridhka iyo alxanka Buundooyinka, taas oo horseedi karta wareegyo gaagaaban. Sidaa darteed, go’aankaagu wuxuu u baahan yahay inuu tixgeliyo qodobbada kala duwan ee lagu xusay maqaalkan. Waxaan rajeyneynaa in maqaalkani kaa caawin doono inaad si fiican u fahanto NOOCA filimka iska caabbinta PCB. Haddii aad qabtid wax su’aalo ah, ama aad u baahan tahay inaad nala soo xiriirto, mar walba waan ku faraxsanahay inaan ku caawino.