{"id":4805,"date":"2026-03-12T09:17:05","date_gmt":"2026-03-12T09:17:05","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4805"},"modified":"2026-03-12T09:33:13","modified_gmt":"2026-03-12T09:33:13","slug":"pcb-blind-and-buried-via-manufacturing-process-guide","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/da\/pcb-blind-and-buried-via-manufacturing-process-guide\/","title":{"rendered":"PCB Blind and Buried Via Manufacturing Process Guide"},"content":{"rendered":"<h2 class=\"wp-block-heading\">1. Oversigt over<\/h2>\n\n\n\n<p>Blinde vias og nedgravede vias bruges hovedsageligt til print med h\u00f8j t\u00e6thed og til print med meget sm\u00e5 huller. M\u00e5let er at spare plads til routing og dermed g\u00f8re printet mindre. Et almindeligt eksempel er printkort til mobiltelefoner.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. Klassificering<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">A) Laserboring<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">1. \u00c5rsager til at bruge laserboring<\/h4>\n\n\n\n<p>a. Kunden beder om laserboring.<br>b. Blinde vias kan v\u00e6re meget sm\u00e5 (&lt;= 6 MIL), s\u00e5 kun en laser kan bore dem p\u00e5lideligt.<br>c. Ved s\u00e6rlige blinde og nedgravede via-stakke - f.eks. hvis der er en blind via fra L1 til L2 og en nedgravet via fra L2 til L3 - er laserboring p\u00e5kr\u00e6vet.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">2. Princippet i laserboring<\/h4>\n\n\n\n<p>Laserboring bruger varmen fra laseren til at fordampe eller smelte pladematerialet og lave et hul. For at det kan fungere, skal pladematerialet absorbere laserenergien. Af den grund bruges ofte materialer af RCC-typen, fordi de ikke indeholder glasfiberstof og derfor ikke reflekterer laseren.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">3. Kort introduktion til RCC-materiale<\/h4>\n\n\n\n<p>RCC betyder Resin Coated Copper (harpiksbelagt kobber). Det er kobberfolie, der har et lag af speciel harpiks p\u00e5 den ru side af den elektrolytiske kobberfolie.<br>I vores virksomhed har vi tre leverand\u00f8rer af RCC: Shengyi, Mitsui og LG.<br>Materialevalg: Harpikstykkelse 50, 65, 70, 75, 80 \u00b5m, kobberfolietykkelse 12, 18 \u00b5m osv.<br>RCC findes i kvaliteter med h\u00f8j og lav Tg. Dens dielektriske konstant er normalt lavere end standard FR-4. For eksempel har Shengyis S6018 en dielektrisk konstant p\u00e5 3,8, s\u00e5 v\u00e6r forsigtig, n\u00e5r du har brug for impedansstyring.<br>For detaljer om specifikke materialer, sp\u00f8rg venligst PE (product engineering) eller RD (research &amp; development) teamet.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">4. V\u00e6rkt\u00f8j og v\u00e6rkt\u00f8jskrav til laserboring<\/h4>\n\n\n\n<p>A) Det er sv\u00e6rt for laseren at br\u00e6nde gennem kobber. S\u00e5 f\u00f8r du laserborer, skal du \u00e6tse en kobberafstand ved blind-via-positionerne. Afstanden skal svare til den f\u00e6rdige hulst\u00f8rrelse.<br>B) Positioneringsm\u00e6rker til laserboring tilf\u00f8jes p\u00e5 L2\/L(N-1)-laget. Marker dette p\u00e5 siden for \u00e6ndring af MI-film.<br>C) Filmen til \u00e6tsning af blind-via spots skal produceres af LDI. Udsk\u00e5rne paneler og v\u00e6rkt\u00f8j skal bruge LDI's panelst\u00f8rrelse.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">5. Funktioner i produktionsflowet<\/h4>\n\n\n\n<p>A) N\u00e5r det samlede antal bordlag er N, skal du f\u00f8rst lave L2-L(N-1)-lagene efter den normale proces for indre lag.<br>B) Efter laminering og efter routing af kortets kontur skal du \u00e6ndre flowet som f\u00f8lger:<br>\u2192 bor LDI-registreringshuller \u2192 t\u00f8r film \u2192 \u00e6tsning af blind-via-pletter \u2192 laserbor \u2192 bor gennem huller \u2192 elektrol\u00f8s kobber \u2192 (normal proces).<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">6. Andre noter<\/h4>\n\n\n\n<p>A) RCC-materialer er i mange tilf\u00e6lde ikke UL-certificerede. S\u00e5 lad v\u00e6re med at tilf\u00f8je et UL-m\u00e6rke til disse plader indtil videre.<br>B) Om panellayout og MI: For at undg\u00e5 at behandle layouts, der inkluderer RCC, som paneler med falske lag (MI-filmv\u00e6rkstedet laver film med falske lag p\u00e5 en anden m\u00e5de end normale film), skal du adskille RCC fra L2 eller L(N-1), n\u00e5r du tegner panelstrukturen. Se for eksempel SR2711\/01 panellayout.<br>C) IPC-6016 er standarden for HDI-kort:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Laser blind-via v\u00e6g kobber tykkelse: 0,4 mil (min).<\/li>\n\n\n\n<li>Krav til loddefillet: tangentialitet er tilladt.<\/li>\n\n\n\n<li>Hvis pudens st\u00f8rrelse ikke er mere end 5 mil st\u00f8rre end hullets diameter, kan du overveje at tilf\u00f8je en dr\u00e5be.<br>D) Hold pladekanten \u2265 0,8\u201d.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"548\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/SR2711-01-panel-layout.webp\" alt=\"SR2711-01 panel layout\" class=\"wp-image-4806\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/SR2711-01-panel-layout.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/SR2711-01-panel-layout-300x206.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/SR2711-01-panel-layout-768x526.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/SR2711-01-panel-layout-18x12.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">B) Mekanisk boring til blinde\/nedgravede vias<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">1. Anvendelsesomr\u00e5de<\/h4>\n\n\n\n<p>N\u00e5r borest\u00f8rrelsen er \u2265 0,20 mm, b\u00f8r man overveje mekanisk boring.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">2. Pletteringsmetode til blinde\/nedgravede vias (se RD-meddelelse TSFMRD-113)<\/h4>\n\n\n\n<p>A) Normalt kan ethvert lags kobberoverflade kun have \u00e9t panelpletteringstrin plus \u00e9t m\u00f8nsterpletteringstrin.<br>B) N\u00e5r den fulde lamineringsproces er f\u00e6rdig, og pladetykkelsen er \u2265 80 MIL, kr\u00e6ver gennemg\u00e5ende huller normalt panelplettering + m\u00f8nsterplettering. N\u00e5r man pletterer blinde vias, m\u00e5 den ydre lagoverflade derfor ikke v\u00e6re panelpletteret.<br>C) Hvis de to ovenst\u00e5ende punkter er opfyldt, udf\u00f8res blind-via-bel\u00e6gning p\u00e5 f\u00f8lgende m\u00e5de:<br>I) Hvis det ydre lags sporbredde &gt; 6 MIL og den gennemg\u00e5ende pladetykkelse &lt; 80 MIL, kan det ydre lags paneloverflade panelpletteres under blind-via-plettering.<br>II) Hvis det ydre lags sporbredde er &gt; 6 MIL, men tykkelsen p\u00e5 gennemg\u00e5ende huller er &gt; 80 MIL, skal det ydre lags overflade beskyttes med film under blind-via-plettering.<br>III) Hvis det ydre lags sporbredde er &lt; 6 MIL og tykkelsen p\u00e5 gennemg\u00e5ende huller \u2265 80 MIL, skal det ydre lags overflade beskyttes med en film under blind-via-plettering.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">3. Metoder til film (loddemaske\/t\u00f8rfilm)<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>N\u00e5r blind-via-aspektforholdet L\/D \u2264 0,8, p\u00e5f\u00f8res t\u00f8r film p\u00e5 yderlagets overflade, og hele panelet eksponeres. Derefter bliver de indre lags blind-via-overflader str\u00f8ml\u00f8st belagt som et helt panel.<\/li>\n\n\n\n<li>N\u00e5r blind-via-aspektforholdet L\/D &gt; 0,8, skal du p\u00e5f\u00f8re t\u00f8r film p\u00e5 yderlagets overflade og kun eksponere blind-via-pletterne. Til dette skal du lave en pletteringseksponeringsfilm eller bruge LDI-eksponering. Derefter bliver de indre lags blind-via-overflader elektrolytisk belagt som et helt panel.<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">4. Metoder til eksponering af blind-via-pletter<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>For blinde vias \u2264 0,4 mm (16 MIL) skal du bruge LDI til at eksponere de blinde viapunkter.<\/li>\n\n\n\n<li>For blinde vias &gt; 0,4 mm (16 MIL) skal du bruge film til at eksponere de blinde viapunkter.<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">5. Filmmetoder til nedgravede vias<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>N\u00e5r sporbredden p\u00e5 den nedgravede viaside er \u2264 4 MIL, har den nedgravede via-overflade brug for film for at eksponere pletterne.<\/li>\n\n\n\n<li>N\u00e5r sporbredden p\u00e5 den nedgravede via-side er &gt; 4 MIL, kan den nedgravede via-overflade panelbel\u00e6gges direkte.<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">6. Noter og punkter at huske p\u00e5<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>For L\/D-aspektforholdet: L = dielektrisk tykkelse + kobbertykkelse, D = blind\/nedgravet via-diameter.<\/li>\n\n\n\n<li>For blind\/nedgravet via plating-film: eksponeringsspotdiameter D_spot = D - 6 (MIL).\n<ul class=\"wp-block-list\">\n<li>Tilf\u00f8j justeringsm\u00e6rker til eksponeringsspotfilmen. Deres koordinater skal stemme overens med de ydre referencehuller.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Blinde vias, der har brug for filmbeskyttelse, bel\u00e6gges normalt med pulsstr\u00f8m (AC) under galvaniseringen.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. S\u00e6rlige krav og procesbem\u00e6rkninger til blind-via-plader<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Harpiksfyldte blinde vias<\/strong>:<br>N\u00e5r st\u00f8rrelsen p\u00e5 de nedgravede vias er stor, og der er mange huller, kan det kr\u00e6ve meget resin at fylde viasene ved presning af kortet. For at undg\u00e5, at dette p\u00e5virker den endelige pladetykkelse, kan R&amp;D anmode om at fylde de nedgravede vias med resin f\u00f8r laminering. P\u00e5fyldningsmetoden kan f\u00f8lge den gr\u00f8nne loddemaske via-fyldningsmetode.<\/li>\n\n\n\n<li><strong>N\u00e5r det ydre lag har blinde vias<\/strong>:<br>a. Under presning kan det ydre lag l\u00e6kke harpiks. S\u00e5 efter laminering tilf\u00f8jes et trin til fjernelse af harpiks (de-gumming).<br>b. F\u00f8r det yderste lag t\u00f8rfilm reng\u00f8res pladeoverfladen, og der foretages en pladepolering. Kemisk kobber (elektrol\u00f8st kobber) er meget tyndt (kun 0,05-0,1 mil), s\u00e5 det kan blive slidt v\u00e6k under poleringen. For at undg\u00e5 dette skal du tilf\u00f8je et panelpletteringstrin for at g\u00f8re kobberet tykkere. Typisk flow: laminering \u2192 fjernelse af harpiks \u2192 boring \u2192 kemisk kobber \u2192 panelplettering \u2192 t\u00f8rfilm \u2192 m\u00f8nsterplettering.<\/li>\n\n\n\n<li><strong>Blind-via-kort med h\u00f8jt antal lag og PIN-LAM<\/strong>:<br>N\u00e5r man laver print med mange lag og blinde vias, kan man bruge PIN-LAM-laminering. Bem\u00e6rk, at vores maskiner kun kan bore PIN-LAM-huller, n\u00e5r kernetykkelsen er mindre end 30 MIL. I mange tilf\u00e6lde bruger vi stadig normal laminering; for eksempel er PR4726010 lavet med normal laminering.<\/li>\n\n\n\n<li><strong>Bordkant<\/strong>:<br>Da der kan v\u00e6re flere lamineringer og mange proceshuller, skal du lade pladekanten v\u00e6re \u2265 0,8\u201d.<\/li>\n\n\n\n<li><strong>LOT-kort og panelnoter<\/strong>:<br>N\u00e5r du skriver LOT-kortet, skal du for delprocesser skrive panelstrukturen for den enkelte delproces og ogs\u00e5 skrive panelstrukturen for hovedprocessen i de s\u00e6rlige krav. Dette hj\u00e6lper senere operationer.<\/li>\n\n\n\n<li><strong>Hvor skal blind-via-t\u00f8rfilmen placeres (indre eller ydre lag)?<\/strong>:<br>Giv eksempler: Hvis kernens A-tykkelse er st\u00f8rre end 12 MIL (eksklusive kobbertykkelse), skal du placere den t\u00f8rre film p\u00e5 det ydre lag. Hvis kernens A-tykkelse er mindre end 12 MIL (ekskl. kobbertykkelse), skal du placere den t\u00f8rre film p\u00e5 det inderste lag.<\/li>\n<\/ol>\n\n\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. Hurtige p\u00e5mindelser og kontrollerede v\u00e6rdier<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hold pladekanten \u2265 0,8\u201d.<\/li>\n\n\n\n<li>Laser blind-via v\u00e6g kobber \u2265 0,4 mil.<\/li>\n\n\n\n<li>Ved forskel i st\u00f8rrelse p\u00e5 pude og hul p\u00e5 \u2264 5 mil foresl\u00e5s teardrops.<\/li>\n\n\n\n<li>Brug RCC til laserboring, fordi RCC absorberer laser.<\/li>\n\n\n\n<li>Ved blind\/nedgravet via-plating skal du kontrollere det yderste lags sporbredde og den samlede pladetykkelse for at afg\u00f8re, om du skal panel-plate eller beskytte med film.<\/li>\n\n\n\n<li>L\/D = (dielektrikum + kobber) \/ huldiameter. Brug dette til at v\u00e6lge eksponerings- og filmmetoder.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>1. Overview Blind vias and buried vias are mainly used for high-density boards and for boards with very small holes. 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