High precision analog encoder system
US6396052B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 2000 |
| Grant date | May 28, 2002 |
| Priority date | — |
| Expiry date | Apr 7, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/24404
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of determining a feed position of a print medium in an imaging apparatus includes an encoder device, connected to a feed shaft, that produces a first periodic signal and a second periodic signal approximately 90 degrees out of phase with the first. A modified first signal is created. A modified second signal is created. The modified first signal is added to the modified second signal to create a summation signal that has a plurality of local minimum values, a plurality of local maximum values, and a plurality of substantially linear segments. A periodic modified summation signal is created by adding a corresponding constant value to each linear segment. The feed position of the print medium is calculated based upon a number of cycles of the modified summation signal counted and a determined value of the modified summation signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.