Method of inspecting an electrical disconnection between circuits by calculating physical quantities thereof based on capacitances regarding the circuits measured twice
US6518766B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 25, 2001 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | Aug 8, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/2812
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A disconnection-inspecting method for inspecting an electrical disconnection between circuits formed on both surfaces of a board is provided. The method includes the steps of: placing the board on an insulating sheet laid on a reference conductor; measuring a first capacitance between the reference conductor and one of the circuits formed on a surface of both surfaces opposite to the other surface facing the insulating sheet; measuring a second capacitance between the reference conductor and the one of the circuits by changing a first physical quantity of the insulating sheet; calculating a second physical quantity of each of the circuits based on the first capacitance and the second capacitance measured in the steps of measuring; and judging the presence of the electrical disconnection based on the second physical quantity calculated in the step of calculating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.