Invention Grant
- Patent Title: Layer-layer registration coupon for printed circuit boards
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Application No.: US14838605Application Date: 2015-08-28
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Publication No.: US09958496B2Publication Date: 2018-05-01
- Inventor: Stephanie Moran , Michael C. Freda , Karl Sauter
- Applicant: Oracle International Corporation
- Applicant Address: unknown Redwood Shores
- Assignee: Oracle International Corporation
- Current Assignee: Oracle International Corporation
- Current Assignee Address: unknown Redwood Shores
- Agency: Meyertons, Hood, Kivlin, Kowert & Goetzel, P.C.
- Main IPC: G01R31/28
- IPC: G01R31/28 ; H05K1/11 ; H05K1/02 ; H05K3/46 ; H05K1/16 ; H05K3/00

Abstract:
A method and apparatus for determining misregistration of internal layers of a PCB using resistance measurements is disclosed. In one embodiment, a method includes measuring a first resistance between a first center terminal and a first peripheral terminal of a first registration coupon on a printed circuit board (PCB) panel including at least one PCB. The method further includes measuring a second resistance between the first center terminal and a second peripheral terminal of the first registration coupon, wherein the first and second peripheral terminals are associated with a first internal layer of the PCB. A difference between the first and second resistances is then calculated. Then, based on this difference, a determination is made of a distance of misregistration of the first internal layer, if any, along a first axis.
Public/Granted literature
- US20170059647A1 Layer-Layer Registration Coupon for Printed Circuit Boards Public/Granted day:2017-03-02
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