| 发明名称 | Sheet determining method and printing apparatus | ||
| 摘要 | The type or surface condition of a sheet is determined with high accuracy even when performance of an optical sensor is degraded by ink mists or the like. Specifically, at the time of detecting light from a sheet with a sensor to make a determination on the sheet, at least two detection values are obtained by changing a relation between the sensor and the sheet, and the type or surface condition of the sheet is determined by using the at least two obtained detection values. | ||
| 申请公布号 | US9610793(B2) | 申请公布日期 | 2017.04.04 |
| 申请号 | US201514681598 | 申请日期 | 2015.04.08 |
| 申请人 | Canon Kabushiki Kaisha | 发明人 | Igarashi Yuki |
| 分类号 | B41J11/00;B41J29/393 | 主分类号 | B41J11/00 |
| 代理机构 | Fitzpatrick, Cella, Harper & Scinto | 代理人 | Fitzpatrick, Cella, Harper & Scinto |
| 主权项 | 1. A method of detecting light from a sheet with a sensor to make a determination on the sheet, said method comprising the steps of: obtaining at least two detection values by changing a distance between the sensor and the sheet; and evaluating a ratio of two detection values within two different distance ranges, respectively, and comparing a change rate of the evaluated ratios at the two different distance ranges with a threshold to determine a type or a surface condition of the sheet. | ||
| 地址 | Tokyo JP | ||