Vazeni pratele,<br><br>dovolte, abych se s Vami podelil o nekolik zajimavych zkusenosti. Pred dvema roky u nas jeden kolega vyrobil hezkou osvitovku pro vyrobu DPS. Jako zdroje UV pouzil nejake 4 kusy 8W trubic Philips. Ty byly na objednavku tusim z Conradu a staly o dost vic nez tisicovku. Pred casem me kamarad privedl na myslenku pouziti LED na miste vybojek. Vrtalo mi to v hlave a tak jsem se okolo toho trochu shanel. Byla to az podivuhodna nahoda, ze GMe zacalo dodavat znackove UV LED od spickoveho vyrobce CREE prave ten tyden, kdy nam v osvitovce odesly dve trubice. Napocital jsem tedy domnely potrebny pocet LEDek pro rozumne casy osvitu vzhledem k potrebne energii pro fotorezist a objednal to. Na plochu 20x16cm jsem nasazel 40 kusu LED. Viz obrazky:
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</a><br><a href="http://img212.imagevenue.com/view.php?image=97026_DSC_0002a_122_508lo.jpg" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)"> http://img212.imagevenue.com/view.php?image=97026_DSC_0002a_122_508lo.jpg
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</a><br><br>Teoreticky vychazi potrebny cas pro negativni fotorezist KP 2100 na 54 sekund pri teto plose a proudu 20mA ledkou. V praxi pak, vlivem prosvecovani pokladoveho skla a motivu, potrebuje cca 1:10 - 1:20, temer shodne vychazeji casy pro pozitivni fotorezist, ktery znate napr. z GMe. Jen bych poznamenal, ze puvodni casy s trubicemi byly okolo 2:10. LEDky staly neco kolem 700kc. Shrnul bych to tak, ze Vam takovouto konstrukci mohu vrele doporucit pro malou prototypovou vyrobu. Jsme s ni spokojeni. Obrazky "opravene osvitovky":
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</a><br clear="all"><br>S pozdravem<br>Karel Musil<br>-- <br>VSB - Technical university of Ostrava<br>Faculty of Electrical Engineering and Computer Science<br>Department of Measurement and Control<br>cellular for CZ:+420 777 221 578
<br>e-mails:        <a href="mailto:karel.musil.st@vsb.cz" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)"> karel.musil.st@vsb.cz</a><br><a href="mailto:karel.musil@gmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
karel.musil@gmail.com</a><br>icq: 333381570