Metal sublayer sensing in multi-layer workpiece hole drilling
US11792940B2 · kind B2 · utility
0Cited by
7References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 1, 2021 |
| Grant date | Oct 17, 2023 |
| Priority date | — |
| Expiry date | Nov 4, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2203/0207
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Disclosed herein is a system for drilling in a multilayer printed circuit board. The system includes a source of electromagnetic radiation configured to transmit a measurement pulse in open air to a workpiece, an anode, a resettable electric charge sensor (ECS), operably connected to the anode, and a control unit, configured to receive at least one value indicative of the quantity of at least part of charged molecules received at the anode and determine a second value indicative of the quantity of charged molecules received at the anode that were derivative of emitted electrons responsive to the measurement pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.