Device for detecting thickness of sheet medium and method thereof
US9672679B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 2014 |
| Grant date | Jun 6, 2017 |
| Priority date | — |
| Expiry date | Dec 8, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for detecting a thickness of a sheet medium is provided, the device is used to improve the sensitivity of the entire sheet medium thickness detection device while eliminating the zero voltage impact by disposing, before an A/D converter, an appropriately amplified subtraction amplification unit used for eliminating the zero voltage impact of thickness voltage. The sheet medium thickness detection device includes a thickness sensor, a position voltage conversion unit, an A/D converter and a control processor which are sequentially connected, and further includes a medium position detection unit, a timer unit, a D/A converter and a subtraction amplification unit. The medium position detecting unit is connected to the control processor and is used to detect whether a detected medium passes through, and the timer unit is connected to the control processor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.