{"id":3733,"date":"2024-11-13T18:40:34","date_gmt":"2024-11-13T10:40:34","guid":{"rendered":"http:\/\/www.bestpcbs.com\/blog\/?p=3733"},"modified":"2024-11-13T18:40:50","modified_gmt":"2024-11-13T10:40:50","slug":"what-is-fiducial-marks-pcb","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2024\/11\/what-is-fiducial-marks-pcb\/","title":{"rendered":"What is Fiducial Marks PCB?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.bestpcbs.com\/blog\/2024\/11\/what-is-fiducial-marks-pcb\/#What_is_the_Fiducial_Mark\" >What is the Fiducial Mark?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.bestpcbs.com\/blog\/2024\/11\/what-is-fiducial-marks-pcb\/#What_is_the_Purpose_of_Fiducial_Marks\" >What is the Purpose of Fiducial Marks?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.bestpcbs.com\/blog\/2024\/11\/what-is-fiducial-marks-pcb\/#What_are_the_Different_Types_of_Fiducial_Marks_in_PCB\" >What are the Different Types of Fiducial Marks in PCB?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.bestpcbs.com\/blog\/2024\/11\/what-is-fiducial-marks-pcb\/#What_is_the_Size_of_the_Fiducial_Marks_on_a_PCB\" >What is the Size of the Fiducial Marks on a PCB?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.bestpcbs.com\/blog\/2024\/11\/what-is-fiducial-marks-pcb\/#What_are_Fiducial_Marks_Used_For\" >What are Fiducial Marks Used For?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.bestpcbs.com\/blog\/2024\/11\/what-is-fiducial-marks-pcb\/#Fiducial_Marks_vs_Positioning_Holes\" >Fiducial Marks vs. Positioning Holes<\/a><\/li><\/ul><\/nav><\/div>\n<div class=\"yzp-no-index\"><\/div>\n<p>Fiducial marks may seem small, but their impact on <a href=\"https:\/\/www.bestpcbs.com\/products\/FR4-pcb.htm\" title=\"\">PCB manufacturing<\/a> is substantial. They act as reference points during the assembly process, ensuring precision in placing components. Without them, the accuracy of automated machines would drop, leading to potential misalignment. This guide covers everything you need to know about fiducial marks and their significance in PCB design.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_the_Fiducial_Mark\"><\/span>What is the Fiducial Mark?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Fiducial marks are small, round copper pads on a PCB. They serve as reference points to guide automated assembly machines. Usually circular and made of copper, it serves as a visual cue that tells machines where the board is located on the assembly line. In the PCB manufacturing industry, fiducial marks play an important role in improving production efficiency and quality and reducing manual errors.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2024\/11\/DSC08427.jpg\"><img decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2024\/11\/DSC08427.jpg\" alt=\"What is Fiducial Marks PCB?\" class=\"wp-image-3734\"\/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_the_Purpose_of_Fiducial_Marks\"><\/span>What is the Purpose of Fiducial Marks?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The fiducial marks on PCB plays a vital role in the manufacturing industry, mainly used to assist equipment or systems in the production process of PCB automatic positioning, alignment error detection, size measurement, lead inspection and other operations. Specifically, the role of fiducial marks includes the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Accurate positioning<\/li>\n<\/ul>\n\n\n\n<p>Fiducial marks can provide high-precision positioning information, so that the PCB components can be accurately aligned and installed.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Automated assembly<\/li>\n<\/ul>\n\n\n\n<p>Through the use of machine vision system, fiducial marks can be automatically identified and positioned to achieve automated PCB assembly process, improve production efficiency and reduce manual errors.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Quality control<\/li>\n<\/ul>\n\n\n\n<p>Fiducial marks can be used to detect the position and condition of PCB components for quality control and defect detection to ensure product compliance with specifications.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Accurate calibration<\/li>\n<\/ul>\n\n\n\n<p>Fiducial marks can be used to calibrate measuring equipment or machine vision systems to ensure their accuracy and stability.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Design update and repair<\/li>\n<\/ul>\n\n\n\n<p>Fiducial marks can be used as markers or reference points for positioning and adjusting the PCB during design iteration, troubleshooting, and repair.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_are_the_Different_Types_of_Fiducial_Marks_in_PCB\"><\/span>What are the Different Types of Fiducial Marks in PCB?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Fiducial marks are not one-size-fits-all. Depending on the PCB design and complexity, different types of fiducials come into play:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Global Fiducials: These marks are used to align the entire board. They\u2019re usually placed on the corners or designated locations on the PCB to help machines recognize the board&#8217;s overall position.<\/li>\n\n\n\n<li>Local Fiducials: When certain areas of the PCB require high precision\u2014especially spots with tight component layouts\u2014local fiducials come into play. They\u2019re placed near these critical sections to ensure parts like chips and connectors are placed with pinpoint accuracy.<\/li>\n\n\n\n<li>Panel Fiducials: If multiple PCBs are organized into a single panel for manufacturing, panel fiducials are added to align the entire panel. This ensures that each section of the panel stays in place during assembly.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2024\/11\/AB4B7A70-7CBB-4cfe-B5AC-5261597B6ECF.png\"><img decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2024\/11\/AB4B7A70-7CBB-4cfe-B5AC-5261597B6ECF.png\" alt=\"What is Fiducial Marks PCB?\" class=\"wp-image-3735\"\/><\/a><\/figure>\n\n\n\n<p>Each type of fiducial has its job, guiding machines from broad alignment down to component-specific positioning.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_the_Size_of_the_Fiducial_Marks_on_a_PCB\"><\/span>What is the Size of the Fiducial Marks on a PCB?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The dimensions of the optical points on the PCB are usually circular pads of 1mm to 3mm diameter, plus a solder shield of twice or more the pad size\u200c. Specifically, the size of the optical points can be adjusted according to different needs, and common sizes include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>1mm diameter round pad \u200c with a 0.6mm radius solder mask.<\/li>\n\n\n\n<li>\u200c2mm diameter round pad \u200c with a 1mm radius solder mask.<\/li>\n<\/ul>\n\n\n\n<p>These sizes are chosen to ensure that the optical points can be accurately identified and positioned by the mounter during the SMT production process, especially when dealing with dense pin components, improving the mounting accuracy.<\/p>\n\n\n\n<p>In addition, the shape of the optical point is generally round, because the circular object is easier to be positioned by the machine, and the machine vision system can find the center of the reference point \u200c2 more accurately.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_are_Fiducial_Marks_Used_For\"><\/span>What are Fiducial Marks Used For?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Fiducial marks have a straightforward yet essential purpose. They act as guideposts for automated assembly, ensuring the board is positioned and oriented correctly. Their main uses include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Aligning the Board: Fiducials tell the machines where the board starts and ends, helping them align it for each production step.<\/li>\n\n\n\n<li>Orientation Control: They guide machines to understand how the board is placed on the assembly line, preventing flipped or rotated placement.<\/li>\n\n\n\n<li>Component Precision: Especially with advanced and densely packed PCBs, fiducials ensure that each component is placed where it belongs.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Fiducial_Marks_vs_Positioning_Holes\"><\/span>Fiducial Marks vs. Positioning Holes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Fiducial marks and positioning holes are both used for alignment, but they serve different roles. Fiducial marks are visual reference points that automated machines read optically. They tell the machine where the board is and ensure accurate component placement. On the other hand, positioning holes are physical features. They\u2019re used to mount the board securely onto a frame or machine bed, ensuring that it stays put during the assembly or manual handling.<\/p>\n\n\n\n<p>Think of fiducial marks as the eyes of the process and positioning holes as the hands. Fiducial marks guide precision and accuracy, while positioning holes provide stability and physical anchoring.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Fiducial marks may seem small, but their impact on PCB manufacturing is substantial. They act as reference points during the assembly process, ensuring precision in placing components. Without them, the accuracy of automated machines would drop, leading to potential misalignment. This guide covers everything you need to know about fiducial marks and their significance in [&hellip;]<\/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":[175,174],"tags":[531],"class_list":["post-3733","post","type-post","status-publish","format-standard","hentry","category-best-pcb","category-bestpcb","tag-fiducial-marks-pcb"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts\/3733","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/users\/623"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/comments?post=3733"}],"version-history":[{"count":1,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts\/3733\/revisions"}],"predecessor-version":[{"id":3736,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts\/3733\/revisions\/3736"}],"wp:attachment":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/media?parent=3733"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/categories?post=3733"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/tags?post=3733"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}