Browse Prior Art Database

Silk Screen Alignment Fiducials for Printed Circuit Boards

IP.com Disclosure Number: IPCOM000122052D
Original Publication Date: 1991-Oct-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 35K

Publishing Venue

IBM

Related People

Bocchino, TA: AUTHOR [+6]

Abstract

Described is the use of alignment fiducials for printed circuit boards (PCBs). The fiducials are used to provide the proper alignment of the silk-screen layer to the raw card during the fabrication of the PCBs.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Silk Screen Alignment Fiducials for Printed Circuit Boards

      Described is the use of alignment fiducials for printed circuit
boards (PCBs).  The fiducials are used to provide the proper
alignment of the silk-screen layer to the raw card during the
fabrication of the PCBs.

      During the manufacture of PCBs, a silk-screen layer is applied
to the board to provide critical component information and
identification for the PCB.  In order to provide the proper alignment
of the silk-screen layer, the concept described herein provides
alignment fiducials which allow the manufacturer of the PCBs the
alignment resolution needed.  The fiducials are located on two
opposite corners of the PCB so as to provide 360~ X-Y alignment.

      During the design of the PCB, the fiducials are applied in four
places: top silk, top copper, bottom silk and bottom copper.  A
silk-screen layer template is used during manufacturing by aligning
the fiducials of the template with the copper fiducials on the PCB
currently in process.  This assures that the identification markings
will be properly aligned in accordance with the position of the
components to be mounted later onto the PCB.

      Disclosed anonymously.