Systems and methods for drilling holes in printed circuit boards
AssigneeTri-Star Laminates, Inc.
InventorsSean Matthew Redfern, James Joseph Miller, Paul Ronald St John
Life of this patent
Estimating the term…
Abstract
An entry sheet comprising polymer material for drilling printed circuit boards is provided. The entry sheet is suitable for use with a broad range of diameters, including commonly available drill diameters. The entry sheet comprises an adhesive epoxy configured to, among others, resist drill deflection, resist mechanical damage, and reduce to dust such that the entry sheet may increase drilling accuracy, protect printed circuit board from damage, minimize entry burrs, and may addresses other issues such as fliers, bird nesting, and the like.
Claims32
An entry sheet for drilling circuit boards, the entry sheet comprising:
- a substrate layer having a thickness of about 6 mils or less;
- and
- an entry sheet component provided over the substrate layer, wherein the entry sheet component has a thickness of about 6 mils or less.
An entry sheet for drilling circuit boards, the entry sheet comprising:
- an entry sheet component configured to be used with drill diameters in the range of about 6.7 mm or less, wherein the entry sheet component comprises an adhesive.
A method of drilling circuit boards, the method comprising:
- providing an entry sheet having a thickness of about 12 mils or less, wherein providing the entry sheet further comprises providing an entry sheet component comprising an adhesive epoxy and having a thickness of about 6 mils or less over a substrate layer having a thickness of about 6 mils or less;
- and
- drilling the entry sheet and the circuit boards in succession to create holes in the circuit boards.
A method of manufacturing an entry sheet for drilling circuit boards, the method comprising:
- providing a substrate layer;
- forming an entry sheet component by combining polymer material comprising about 55-95% by weight of bisphenol a/digycidyl epoxy resin with curing agents;
- and
- providing the entry sheet component over the substrate.
Dependencies are inferred from the claim text.