Medium detecting method and device, and printer
US6622625B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 21, 2002 |
| Grant date | Sep 23, 2003 |
| Priority date | — |
| Expiry date | Mar 2, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J11/009
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A reference medium is scanned both with a medium sensor (44) capable of detecting a low-transmittance printing medium with high accuracy and with a medium sensor (45) capable of detecting a high-transmittance medium with low accuracy so as to find edge positions Ry0, Ry1 of the reference medium. The difference Diff0 between the edge positions is calculated and stored as a correction value. If it is hard to detect a printing medium by means of the medium sensor (44), the medium sensor (45) is used to detect the medium, and the resulting edge position is corrected using the correction value Diff0. In addition, for any given printing medium, a first driving level of a light source for outputting a predetermined output amount of the sensor (44) and a second driving level of a light source for outputting a predetermined output amount of the sensor (45) are calculated and, based on the difference between the two driving levels, the type of the printing medium is determined. Thus, various types of printing medium can be read with high accuracy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.