{"id":767,"date":"2020-07-11T10:42:27","date_gmt":"2020-07-11T02:42:27","guid":{"rendered":"http:\/\/www.bestpcbs.com\/blog\/?p=767"},"modified":"2020-07-11T11:02:54","modified_gmt":"2020-07-11T03:02:54","slug":"how-to-improve-the-gap-between-the-convexity-and-led-pad","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2020\/07\/how-to-improve-the-gap-between-the-convexity-and-led-pad\/","title":{"rendered":"How to improve the gap between the convexity and LED pad?"},"content":{"rendered":"
<\/div>\n

About the SinkPad copper core PCB<\/a>, all is known that convexity is very important, the height of convexity is about 0.2mm-0.25mm.<\/p>\n\n\n\n

We need to know what\u00e2\u20ac\u2122s the reasons caused the gap between the convexity and LED pad is big.<\/p>\n\n\n\n

  1. We make the copper core with convexity firstly, then make the circuit\/panel board (FR4PCB\/BT PCB) and finally do the lamination for cooper core and circuit board.<\/li>
  2. The tolerance for convexity is +\/-0.05mm-0.075mm.<\/li>
  3. The tolerance for circuit\/panel board is +\/-0.13mm.<\/li><\/ol>\n\n\n\n

    If we do negative tolerance for convexity and positive tolerance for circuit\/panel board, then it will cause the gap very big.<\/p>\n\n\n\n

    See below picture and details.<\/p>\n\n\n\n

    For example, the size of convexity is 0.5mm, after negative tolerance -0.075mm, it will be 0.425mm and each side will be 0.0375mm smaller.<\/p>\n\n\n\n

    For the circuit\/panel board, the gap between convexity is 0.2mm, after positive tolerance +0.13mm, it will be 0.33mm and each side will be 0.065mm bigger.<\/p>\n\n\n\n

    So finally, the gap will be 0.2mm+0.0375+0.065mm=0.3025mm.\u00c2\u00a0It is about 50% bigger than original size.<\/strong><\/p>\n\n\n\n

    \"sinkpad
    sinkpad pcb<\/figcaption><\/figure>\n\n\n\n
    \"sinkpad
    Big gap between convexity and LED pad<\/figcaption><\/figure>\n\n\n\n

    How to improve that problem?<\/p>\n\n\n\n

    1. Making the copper core with convexity according to design.<\/li>
    2. Measuring the dimension of convexity before making the circuit\/panel board, then making the circuit\/panel board according to the convexity dimension with compensation design.<\/li>
    3. Do Positive tolerance for convexity and negative tolerance for circuit\/panel board, the gap will be much more smaller.<\/li><\/ol>\n\n\n\n

      For example, the size of convexity is 0.5mm, after negative tolerance +0.075mm, it will be 0.575mm and each side will be 0.0375mm bigger<\/p>\n\n\n\n

      For the circuit\/panel board, the gap between convexity is 0.2mm, after positive tolerance -0.13mm, it will be 0.07mm and each side will be 0.065mm smaller.<\/p>\n\n\n\n

      So finally, the gap will be 0.2mm-0.0375-0.065mm=0.0975mm.\u00c2\u00a0It is about 50% smaller than original size.<\/strong><\/p>\n\n\n\n

      \"dtp
      dtp pcb<\/figcaption><\/figure>\n\n\n\n
      \"DTP
      Good gap between convexity and LED pad<\/figcaption><\/figure>\n\n\n\n

      For more information about SinkPad PCB, please click<\/p>\n\n\n\n

      https:\/\/www.bestpcbs.com\/products\/multi-layer-sinkpad-board.htm<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

      About the SinkPad copper core PCB, all is known that convexity is very important, the height of convexity is about 0.2mm-0.25mm. We need to know what\u00e2\u20ac\u2122s the reasons caused the gap between the convexity and LED pad is big. We make the copper core with convexity firstly, then make the circuit\/panel board (FR4PCB\/BT PCB) and finally do the lamination […]<\/p>\n","protected":false},"author":623,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[37,15,3,16],"tags":[157,142],"class_list":["post-767","post","type-post","status-publish","format-standard","hentry","category-faq","category-our-news","category-pcb-news","category-pcb-technology","tag-dtp-pcb","tag-sinkpad-pcb"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t