Apparatus and method for detecting small distance changes between opposed surfaces using giant magneto resistance effect sensor
US6278270A · kind A · utility
15Cited by
9References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1999 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | Oct 29, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2511/13
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device that can sense small changes in distance between opposed surfaces includes a ferromagnetic material and a giant magneto resistance effect sensor. A current source applies a current to the sensor to operate the sensor and read the magnetic field that impinges on the sensor from the ferromagnetic material. The magnetic field changes when the distance between the opposed surfaces changes. The device can be used in imaging apparatus to sense multifeeds and other conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.