Punaisia, vihreit\u00e4 ja sinisi\u00e4 (RGB) LED-valoja voidaan sekoittaa kesken\u00e4\u00e4n, jolloin saadaan aikaan valkoista valoa, jolla on hyvin laaja v\u00e4riskaala. T\u00e4m\u00e4n ominaisuuden vuoksi RGB-LEDit ovat eritt\u00e4in houkuttelevia nestekiden\u00e4yt\u00f6n (LCD) taustavaloj\u00e4rjestelmiss\u00e4. T\u00e4m\u00e4ntyyppisten taustavalojen ansiosta n\u00e4yt\u00f6ist\u00e4 saadaan ohuempia, niiden k\u00e4ytt\u00f6ik\u00e4 pitenee, niiden himmennyssuhde on suurempi ja niiden v\u00e4rit ovat kirkkaampia ja el\u00e4v\u00e4mpi\u00e4. Samalla n\u00e4m\u00e4 n\u00e4yt\u00f6t ovat ymp\u00e4rist\u00f6yst\u00e4v\u00e4llisempi\u00e4.<\/p>\n\n\n\n
N\u00e4iden etujen vuoksi on julkaistu monia tutkimuksia suoraan valaistuista LED-taustavalolevyist\u00e4 ja reunavalaistuista LED-taustavalolevyist\u00e4. Sony julkaisi maailman ensimm\u00e4isen LCD-television, jossa k\u00e4ytettiin RGB-LED-taustavalaistusta. T\u00e4ll\u00e4 tuotteella saavutettiin eritt\u00e4in laaja v\u00e4rintoistoalue, joka oli 105% NTSC-standardin (National Television System Committee) mukaisesta v\u00e4riskaalasta.<\/p>\n\n\n\n
N\u00e4iden tutkimustulosten takana on kuitenkin edelleen l\u00e4mp\u00f6kysymyksi\u00e4. Toiminnan aikana LEDit tuottavat l\u00e4mp\u00f6\u00e4. T\u00e4m\u00e4 l\u00e4mp\u00f6 v\u00e4hent\u00e4\u00e4 valon tehoa ja johtaa my\u00f6s hallitsevan aallonpituuden siirtymiseen. N\u00e4m\u00e4 kaksi vaikutusta muuttavat n\u00e4yt\u00f6n v\u00e4ril\u00e4mp\u00f6tilaa ja aiheuttavat vaihtelua NTSC-suorituskyvyss\u00e4. Lis\u00e4ksi liiallinen l\u00e4mp\u00f6 lyhent\u00e4\u00e4 n\u00e4yt\u00f6n k\u00e4ytt\u00f6ik\u00e4\u00e4. Siksi taustavaloj\u00e4rjestelm\u00e4n l\u00e4mm\u00f6nhallinta on eritt\u00e4in t\u00e4rke\u00e4\u00e4 kuvanlaadun ja pitk\u00e4aikaisen luotettavuuden varmistamiseksi.<\/p>\n\n\n\n
RGB-LED-taustavaloj\u00e4rjestelm\u00e4n l\u00e4mp\u00f6tehokkuuden parantamiseksi voidaan harkita kahta p\u00e4\u00e4asiallista l\u00e4hestymistapaa. Ensimm\u00e4inen l\u00e4hestymistapa on parantaa yksitt\u00e4isen LEDin l\u00e4mm\u00f6nhaihdutuskyky\u00e4. Toinen l\u00e4hestymistapa on parantaa LED-joukon l\u00e4mm\u00f6nhaihdutuskyky\u00e4. RGB-LED-taustavaloj\u00e4rjestelm\u00e4n suunnittelijoina valitsimme toisen l\u00e4hestymistavan l\u00e4mp\u00f6ongelman ratkaisemiseksi.<\/p>\n\n\n\n
LED-joukkoj\u00e4rjestelm\u00e4n l\u00e4mp\u00f6suorituskyvyn parantamiseksi on my\u00f6s kaksi yleist\u00e4 menetelm\u00e4\u00e4. Yksi menetelm\u00e4 on k\u00e4ytt\u00e4\u00e4 tuulettimia, joilla lis\u00e4t\u00e4\u00e4n ilmavirran nopeutta taustavaloj\u00e4rjestelm\u00e4n ymp\u00e4rill\u00e4. Toinen menetelm\u00e4 on v\u00e4hent\u00e4\u00e4 l\u00e4mp\u00f6vastusta LED-risteyksest\u00e4 ymp\u00e4rist\u00f6\u00f6n. Taustavalomoduulin suunnittelu taloudelliselle ja hyvin l\u00e4mp\u00f6\u00e4 johtavalle piirilevylle on parempi ratkaisu.<\/p>\n\n\n\n
T\u00e4ll\u00e4 hetkell\u00e4 laajalti k\u00e4ytetyss\u00e4 perinteisess\u00e4 eristetyss\u00e4 metallialustatekniikassa (IMS) k\u00e4ytet\u00e4\u00e4n eristekerroksena polymeeri- tai epoksihartsimateriaaleja. T\u00e4m\u00e4 tekniikka edellytt\u00e4\u00e4 metallipohjan erityist\u00e4 pintak\u00e4sittely\u00e4. Lis\u00e4ksi erist\u00e4v\u00e4n kerroksen v\u00e4himm\u00e4ispaksuus on yleens\u00e4 noin 75 mikrometri\u00e4. T\u00e4m\u00e4 paksuus lis\u00e4\u00e4 IMS-levyn kokonaisl\u00e4mm\u00f6nvastusta. Lis\u00e4ksi korkeissa l\u00e4mp\u00f6tiloissa perinteiset IMS-levyt voivat k\u00e4rsi\u00e4 eristekerroksen ja metallipohjan v\u00e4lisest\u00e4 delaminaatiosta.<\/p>\n\n\n\n
T\u00e4ss\u00e4 artikkelissa k\u00e4yt\u00e4mme magnetronip\u00f6lytystekniikkaa uudenlaisen eristetyn metallialustan PCB: n valmistamiseen. Alumiinialustan pinnalle luodaan kemiallisesti muodostettu erist\u00e4v\u00e4 kerros, jonka paksuus on 30-35 mikrometri\u00e4. Sitten suunniteltu piiri muodostetaan erist\u00e4v\u00e4lle kerrokselle magnetronip\u00f6lytt\u00e4m\u00e4ll\u00e4. T\u00e4ll\u00e4 uudella eristetyll\u00e4 metallisubstraattipiirilevyll\u00e4 on erinomainen l\u00e4mp\u00f6k\u00e4ytt\u00e4ytyminen, ja sill\u00e4 voidaan my\u00f6s poistaa delaminaatio- tai kuorintaongelmat korkeissa l\u00e4mp\u00f6tiloissa.<\/p>\n\n\n\n
Testitulokset osoittavat, ett\u00e4 uuden eristetyn alumiinialustalevyn l\u00e4mp\u00f6vastus on 4,78 \u00b0C\/W, kun taas perinteisen polymeerieristetyn alumiinialustalevyn l\u00e4mp\u00f6vastus on 7,61 \u00b0C\/W.<\/p>\n\n\n\n
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Magnetroni sputterointitekniikka<\/h3>\n\n\n\nPerus Sputterointiprosessi<\/h4>\n\n\n\n
Sputterointi on tyhji\u00f6prosessi, jota k\u00e4ytet\u00e4\u00e4n materiaalien, kuten metallien, keramiikan ja muovien, pinnalle pinnoittamiseen ohueksi kalvoksi. Sputteroinnin perusprosessi toimii seuraavasti.<\/p>\n\n\n\n
Elektronit t\u00f6rm\u00e4\u00e4v\u00e4t inertin kaasun, yleens\u00e4 argonin, atomeihin ja ionisoivat ne. N\u00e4m\u00e4 korkeaenergiset ionit kiihdytet\u00e4\u00e4n s\u00e4hk\u00f6kent\u00e4n avulla, ja ne pommittavat kohdemateriaalia, joka on tarkoitus laskea. T\u00e4m\u00e4n voimakkaan pommituksen vuoksi atomit sinkoutuvat kohdemateriaalin pinnalta. S\u00e4hk\u00f6kent\u00e4n vaikutuksesta n\u00e4m\u00e4 atomit laskeutuvat lopulta substraatin pinnalle ja muodostavat atomien muodostaman ohuen kalvon. T\u00e4m\u00e4n ohutkalvon paksuus riippuu sputterointiajasta.<\/p>\n\n\n\n
Perinteinen polymeerieristetty metallisubstraattipiirilevy koostuu tyypillisesti kuparikerroksesta, liimakerroksesta, polymeerieristekerroksesta, LED-sirusta, liimasta ja alumiinipohjasta. Sit\u00e4 vastoin magnetronip\u00f6lytt\u00e4misess\u00e4 prosessiin lis\u00e4t\u00e4\u00e4n magneettikentt\u00e4.<\/p>\n\n\n\n
Magnetroni sputterointiprosessi<\/h4>\n\n\n\n
T\u00e4ydellinen magnetronisumutusprosessi eroaa perus-suoravirtasumutuksesta p\u00e4\u00e4asiassa siin\u00e4, ett\u00e4 kohdealueen l\u00e4hell\u00e4 on voimakas magneettikentt\u00e4. T\u00e4m\u00e4 magneettikentt\u00e4 pakottaa elektronit liikkumaan magneettikentt\u00e4viivoja pitkin l\u00e4hell\u00e4 kohteen pintaa sen sijaan, ett\u00e4 ne vet\u00e4ytyisiv\u00e4t kohti substraattia.<\/p>\n\n\n\n
Magnetronip\u00f6lytt\u00e4misess\u00e4 on kolme merkitt\u00e4v\u00e4\u00e4 etua verrattuna perusputterointiin. Ensinn\u00e4kin plasma-alue rajoittuu l\u00e4helle kohdemateriaalia eik\u00e4 vahingoita muodostuvaa ohutkalvoa. Toiseksi elektronien kulkureitin pituus pitenee, mik\u00e4 lis\u00e4\u00e4 argonatomien ionisoitumisen todenn\u00e4k\u00f6isyytt\u00e4. T\u00e4m\u00e4n seurauksena kohdeatomeja sinkoutuu enemm\u00e4n, ja sputteroinnin tehokkuus paranee. Kolmanneksi magnetronip\u00f6lytyksell\u00e4 tuotetut ohutkalvot sis\u00e4lt\u00e4v\u00e4t v\u00e4hemm\u00e4n ep\u00e4puhtauksia, mik\u00e4 takaa kalvon korkean laadun.<\/p>\n\n\n\n
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Anodisoidun eristetyn alumiinisubstraatin PCB: n suunnittelu<\/h3>\n\n\n\n
Anodisoitu eristetty alumiinisubstraatti PCB koostuu kolmesta kerroksesta: alumiininen pohjakerros, anodisoitu erist\u00e4v\u00e4 kerros ja metallointikerros. Itse metallointikerros koostuu kolmesta ohuesta kalvosta, jotka ovat pohjakalvo, johtava kalvo ja juotettava kalvo.<\/p>\n\n\n\n
Alumiininen pohjakerros<\/h4>\n\n\n\n
Alumiininen pohjakerros muodostaa piirilevyn perustan. Alumiinimateriaalia valittaessa on otettava huomioon kaksi tekij\u00e4\u00e4. Ensinn\u00e4kin alumiinilla on oltava riitt\u00e4v\u00e4 mekaaninen lujuus ja hyv\u00e4 ty\u00f6stett\u00e4vyys. Toiseksi sen on sovelluttava anodisointiin ja eristysk\u00e4sittelyyn. Tietyiss\u00e4 olosuhteissa alumiinipohja voidaan my\u00f6s ty\u00f6st\u00e4\u00e4 ev\u00e4n muotoiseksi rakenteeksi, jotta l\u00e4mm\u00f6nhukka saadaan poistettua entist\u00e4 paremmin.<\/p>\n\n\n\n
Anodisoitu eristekerros<\/h4>\n\n\n\n
Anodisoitu erist\u00e4v\u00e4 kerros muodostetaan erityisell\u00e4 anodisointiprosessilla, joka luo mikrohuokoisen rakenteen. T\u00e4m\u00e4 mikrohuokoinen rakenne m\u00e4\u00e4ritt\u00e4\u00e4 kerroksen s\u00e4hk\u00f6isen eristyskyvyn. K\u00e4ytetyst\u00e4 k\u00e4sittelytekniikasta riippuen t\u00e4m\u00e4n kerroksen dielektrinen lujuus voi vaihdella 250 V:sta 3000 V:iin.<\/p>\n\n\n\n
T\u00e4h\u00e4n kerrokseen muodostetaan piirikuvio fotolitografian tai peittotekniikan avulla. T\u00e4m\u00e4 rakenne mahdollistaa saumattoman integroinnin pohjakerroksen ja eristekerroksen v\u00e4lill\u00e4. Samalla LED-sirut asennetaan suoraan t\u00e4h\u00e4n kerrokseen. T\u00e4m\u00e4n seurauksena LED-siru, piirilevy ja j\u00e4\u00e4hdytyselementti muodostavat yhden integroidun rakenteen. T\u00e4m\u00e4 parantaa huomattavasti piirilevyn yleist\u00e4 l\u00e4mp\u00f6tehoa.<\/p>\n\n\n\n
Metallointi kerros<\/h4>\n\n\n\n
Metallointikerros koostuu pohjakalvosta, johtavasta kalvosta ja juotettavasta kalvosta. T\u00e4m\u00e4n kerroksen on paitsi tarjottava hyv\u00e4 s\u00e4hk\u00f6njohtavuus my\u00f6s varmistettava vahva tartunta metallointikerroksen ja anodisoidun eristekerroksen v\u00e4lill\u00e4. Piiri muodostetaan t\u00e4h\u00e4n kerrokseen magnetronip\u00f6lytt\u00e4mistekniikalla.<\/p>\n\n\n\n
Pohjakalvon paksuus on 0,1-0,15 mikrometri\u00e4. Se muodostetaan sputteroimalla metalleja, kuten kromia tai titaania. Pohjakalvon p\u00e4\u00e4teht\u00e4v\u00e4n\u00e4 on luoda vahva tartunta metallointikerroksen ja anodisoidun eristekerroksen v\u00e4lille. Magnetronip\u00f6lytt\u00e4m\u00e4ll\u00e4 adheesiolujuus voi olla jopa 1000 N\/cm\u00b2, mik\u00e4 tekee sidoksesta eritt\u00e4in vakaan. Lis\u00e4ksi pohjakalvolla on erinomainen korkean l\u00e4mp\u00f6tilan kest\u00e4vyys. Jopa yli 320 \u00b0C:n l\u00e4mp\u00f6tiloissa 10 sekunnin ajan ei tapahdu rakkuloita tai kuoriutumista. Siksi se soveltuu t\u00e4ysin lyijytt\u00f6miin juotosprosesseihin.<\/p>\n\n\n\n
Johtavan kalvon paksuus on 1-2 mikrometri\u00e4. Se muodostuu kuparia, nikkeli\u00e4 tai kupari-nikkeliseoksia sputteroimalla. Kalvolla on kaksi p\u00e4\u00e4asiallista tarkoitusta. Yksi tarkoitus on johtaa tietty\u00e4 virrantiheytt\u00e4. Toinen tarkoitus on toimia puskurikerroksena, kun peruskalvon ja juotettavan kalvon l\u00e4mp\u00f6laajenemiskertoimien eroista johtuva muodonmuutos tapahtuu. T\u00e4m\u00e4 puskurivaikutus auttaa s\u00e4ilytt\u00e4m\u00e4\u00e4n koko metallointikerroksen vakauden.<\/p>\n\n\n\n
Juotettavan kalvon paksuus on 0,3-0,8 mikrometri\u00e4. Se muodostetaan sputteroimalla metalleja, kuten kultaa tai hopeaa, joilla on hyv\u00e4 l\u00e4mm\u00f6njohtavuus, s\u00e4hk\u00f6njohtavuus ja juotettavuus. T\u00e4m\u00e4n kerroksen p\u00e4\u00e4teht\u00e4v\u00e4n\u00e4 on helpottaa elektronisten komponenttien, kuten LED-sirujen, juottamista.<\/p>\n\n\n\n
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Valmistusprosessin teknologia<\/h3>\n\n\n\n
Koko valmistusprosessi sis\u00e4lt\u00e4\u00e4 viisi vaihetta, jotka voidaan jakaa kolmeen p\u00e4\u00e4vaiheeseen. N\u00e4ihin vaiheisiin kuuluvat alumiinipohjan anodisointi, piirikuvion muodostaminen anodisoituun eristekerrokseen fotolitografian tai maskeerauksen avulla, pohjakalvon, johtavan kalvon ja juotettavan kalvon laskeutuminen magnetronip\u00f6lytt\u00e4m\u00e4ll\u00e4 ja lopuksi silkkipainatus sek\u00e4 juotosvirran ja juotosmaskin levitt\u00e4minen.<\/p>\n\n\n\n
Alumiinipohjan anodisointi<\/h4>\n\n\n\n
Aluksi alumiinipohja rasvanpoistetaan ja puhdistetaan. Sitten se asetetaan elektrolyyttikylpyyn, joka on t\u00e4ytetty elektrolyytill\u00e4. Elektrolyytti voi olla rikkihappoa tai oksaalihappoa riippuen oksidikerroksen vaadituista ominaisuuksista ja prosessiolosuhteista. Anodisoinnin aikana alumiinipohja toimii anodina. Keskeisi\u00e4 prosessiparametreja ovat elektrolyyttikonsentraatio, virrantiheys ja elektrolyytin l\u00e4mp\u00f6tila. Jotta saadaan p\u00e4tev\u00e4 anodisoitu eristekerros, anodisointiaikaa on valvottava huolellisesti.<\/p>\n\n\n\n
Magnetroni Sputterointi Deposition<\/h4>\n\n\n\n
Ennen kalvop\u00e4\u00e4llystyst\u00e4 piirikuvio on luotava anodisoituun eristekerrokseen fotolitografian tai peitetekniikan avulla. Kun k\u00e4ytet\u00e4\u00e4n fotolitografiaa, anodisoitu alumiinilevy p\u00e4\u00e4llystet\u00e4\u00e4n fotoresistill\u00e4, valotetaan ja kehitet\u00e4\u00e4n. Sitten se asennetaan kiinnikkeeseen ilman maskia. Kun k\u00e4ytet\u00e4\u00e4n maskitekniikkaa, maskilevy asennetaan kiinnittimen pinnalle, kun anodisoitu alumiinilevy kiinnitet\u00e4\u00e4n.<\/p>\n\n\n\n
J\u00e4lkik\u00e4sittelyvaiheet<\/h4>\n\n\n\n
Suunnitteluvaatimusten mukaan p\u00e4\u00e4llystetyn anodisoidun alumiinisubstraatin piirilevyn tietyille alueille levitet\u00e4\u00e4n vuota ja juotosmaski, jotta se voidaan valmistella elektronisten komponenttien kokoonpanoa varten.<\/p>\n\n\n\n
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L\u00e4mp\u00f6resistanssin laskentamenetelm\u00e4<\/h3>\n\n\n\n
L\u00e4mp\u00f6resistanssilla tarkoitetaan l\u00e4mp\u00f6\u00e4 johtavan materiaalin vastusta l\u00e4mp\u00f6virralle l\u00e4mm\u00f6nl\u00e4hteest\u00e4 l\u00e4mp\u00f6\u00e4 absorboivaan laitteeseen. Sen yksikk\u00f6 on \u00b0C\/W. L\u00e4mp\u00f6resistanssi m\u00e4\u00e4ritell\u00e4\u00e4n l\u00e4mp\u00f6tilaerona jaettuna l\u00e4mp\u00f6tehon siirtonopeudella.<\/p>\n\n\n\n Kahden pisteen v\u00e4linen l\u00e4mp\u00f6resistanssi voidaan ilmaista l\u00e4mp\u00f6tilaerona jaettuna pisteiden v\u00e4lill\u00e4 haihtuvalla teholla.<\/p>\n\n\n\n LEDien l\u00e4mp\u00f6ominaisuuksien mittaamiseen k\u00e4ytet\u00e4\u00e4n yleisesti useita menetelmi\u00e4. N\u00e4it\u00e4 ovat infrapunal\u00e4mp\u00f6kuvaus, spektrimenetelm\u00e4t, optisen tehon menetelm\u00e4t, lyijyn l\u00e4mp\u00f6tilamenetelm\u00e4t ja s\u00e4hk\u00f6isten parametrien menetelm\u00e4t. T\u00e4ss\u00e4 asiakirjassa ehdotetaan parannettua s\u00e4hk\u00f6isten parametrien menetelm\u00e4\u00e4.<\/p>\n\n\n\n Liitoksen ja ymp\u00e4rist\u00f6n v\u00e4linen l\u00e4mp\u00f6resistanssi lasketaan k\u00e4ytt\u00e4en liitoksen l\u00e4mp\u00f6tilaa, ymp\u00e4rist\u00f6n l\u00e4mp\u00f6tilaa ja h\u00e4vi\u00f6tehoa. Liitosl\u00e4mp\u00f6tilan nousu on lineaarisessa suhteessa eteenp\u00e4in suuntautuvan j\u00e4nnitteen muutokseen, kun virta on riitt\u00e4v\u00e4n pieni. Koska liitoksen alkul\u00e4mp\u00f6tila on l\u00e4hes sama kuin ymp\u00e4rist\u00f6n l\u00e4mp\u00f6tila, liitoksen ja ymp\u00e4rist\u00f6n l\u00e4mp\u00f6tilaero saadaan suoraan.<\/p>\n\n\n\n Yhdist\u00e4m\u00e4ll\u00e4 asiaankuuluvat yht\u00e4l\u00f6t voidaan laskea liittym\u00e4n ja ymp\u00e4rist\u00f6n v\u00e4linen l\u00e4mp\u00f6resistanssi. K\u00e4yt\u00e4nn\u00f6ss\u00e4 optinen teho on hyvin pieni verrattuna s\u00e4hk\u00f6tehoon, joten se voidaan j\u00e4tt\u00e4\u00e4 huomiotta.<\/p>\n\n\n\n Mittausmenetelm\u00e4\u00e4n kuuluu suuritehoisen LEDin valitseminen l\u00e4mmitysl\u00e4hteeksi, vakio-LEDin k\u00e4ytt\u00e4minen testilaitteena, niiden s\u00e4hk\u00f6inen erist\u00e4minen, j\u00e4nnitteen muutosten mittaaminen ennen ja j\u00e4lkeen l\u00e4mmityksen, l\u00e4mp\u00f6tilan nousun laskeminen, h\u00e4vi\u00f6tehon m\u00e4\u00e4ritt\u00e4minen ja lopuksi l\u00e4mp\u00f6resistanssin laskeminen.<\/p>\n\n\n\n Kuvatun menetelm\u00e4n avulla voidaan laskea sek\u00e4 tavanomaisten polymeerieristettyjen metallialustan piirilevyjen ett\u00e4 anodisoitujen eristettyjen alumiinialustan piirilevyjen l\u00e4mp\u00f6resistanssi. Kokonaisl\u00e4mp\u00f6resistanssin lis\u00e4ksi mitataan my\u00f6s kunkin yksitt\u00e4isen kerroksen l\u00e4mp\u00f6resistanssi.<\/p>\n\n\n\n Eri kerrosten l\u00e4mp\u00f6resistanssit on kytketty sarjaan. Kokonaisl\u00e4mp\u00f6resistanssi on liitoskohdan ja metallikerroksen, metallikerroksen ja substraatin sek\u00e4 substraatin ja ymp\u00e4rist\u00f6n v\u00e4listen vastusten summa.<\/p>\n\n\n\n Tulokset osoittavat, ett\u00e4 anodisoidun eristetyn alumiinisubstraattipiirilevyn l\u00e4mp\u00f6resistanssi on 59,2% alhaisempi kuin tavanomaisen polymeerieristetyn metallisubstraattipiirilevyn. T\u00e4m\u00e4 parannus johtuu p\u00e4\u00e4asiassa kahdesta tekij\u00e4st\u00e4. Ensinn\u00e4kin tavanomaisella piirilevyll\u00e4 on yksi rakennekerros enemm\u00e4n kuin anodisoidulla piirilevyll\u00e4. Toiseksi anodisoitu eristekerros on paljon ohuempi ja sill\u00e4 on paljon parempi l\u00e4mm\u00f6njohtavuus kuin polymeerieristekerroksella.<\/p>\n\n\n\n L\u00e4mm\u00f6nhallinta on kriittinen kysymys RGB-LED-taustavaloj\u00e4rjestelmien kehitt\u00e4misess\u00e4. T\u00e4ss\u00e4 tutkimuksessa kehitet\u00e4\u00e4n uudenlainen anodisoitu eristetty alumiinisubstraattipiirilevy ja ehdotetaan parannettua s\u00e4hk\u00f6ist\u00e4 parametrimenetelm\u00e4\u00e4 l\u00e4mp\u00f6vastuksen mittaamiseen.<\/p>\n\n\n\n Verrattuna tavanomaisiin polymeerieristettyihin metallialustan PCB: hen, anodisoidulla eristetyll\u00e4 alumiinialustalla PCB: ll\u00e4 on useita etuja. Anodisoidun eristekerroksen ja alumiinialustan v\u00e4lill\u00e4 ei ole mekaanista rakoa, mik\u00e4 parantaa yleist\u00e4 mekaanista lujuutta. Magnetronip\u00f6lytyksell\u00e4 muodostettu kolmikerrosmetallirakenne tarjoaa vahvan tartunnan, joka on v\u00e4hint\u00e4\u00e4n 1000 N\/cm\u00b2, mik\u00e4 parantaa mekaanista vakautta entisest\u00e4\u00e4n. Lis\u00e4ksi kerrosten v\u00e4hentynyt m\u00e4\u00e4r\u00e4 ja ohuempi eristekerros alentavat kokonaisl\u00e4mp\u00f6resistanssia merkitt\u00e4v\u00e4sti 59,2%.<\/p>\n\n\n\n N\u00e4iden etujen vuoksi anodisoidut eristetyt alumiinisubstraattipiirilevyt soveltuvat paremmin k\u00e4ytett\u00e4v\u00e4ksi RGB-LED-taustavaloj\u00e4rjestelmiss\u00e4 kuin perinteiset polymeerieristetyt metallisubstraattipiirilevyt.<\/p>\n\n\n\n <\/p>","protected":false},"excerpt":{"rendered":" Introduction A light-emitting diode (LED) is a solid-state semiconductor device that converts electrical energy into light. 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A light-emitting diode (LED) is a solid-state semiconductor device that converts electrical energy into light. Compared with traditional incandescent […]","_links":{"self":[{"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/posts\/4593","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/comments?post=4593"}],"version-history":[{"count":1,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/posts\/4593\/revisions"}],"predecessor-version":[{"id":4599,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/posts\/4593\/revisions\/4599"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/media\/4598"}],"wp:attachment":[{"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/media?parent=4593"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/categories?post=4593"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/tags?post=4593"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"Thermal](\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/12\/Thermal-resistance-of-the-heat-conducting-material.webp\")
<\/figure>\n\n\n\nL\u00e4mp\u00f6resistanssin mittausmenetelm\u00e4<\/h4>\n\n\n\n
![\"Method](\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/12\/Method-for-calculating-the-thermal-resistance-between-the-junction-and-the-ambient.webp\")
<\/figure>\n\n\n\n![\"Schematic](\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/12\/Schematic-diagram-of-the-measurement-setup-for-junction-to-ambient-thermal-resistance.webp\")
<\/figure>\n\n\n\n
\n\n\n\nAnodisoidun eristetyn alumiinisubstraatin PCB: n l\u00e4mp\u00f6resistanssitulokset<\/h3>\n\n\n\n
![\"Thermal](\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/12\/Thermal-resistance-of-the-anodized-insulated-aluminum-substrate-PCB.webp\")
<\/figure>\n\n\n\n
\n\n\n\nP\u00e4\u00e4telm\u00e4<\/h3>\n\n\n\n