Depth of field adjustment device and method for an automatic document feeder
US7038819B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Nov 13, 2001 |
| Grant date | May 2, 2006 |
| Priority date | — |
| Expiry date | May 2, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/1017
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a depth of field adjustment device and method for an automatic document feeder. The automatic document feeder has a guiding groove for placing an object to be scanned. The guiding groove has a scanning window for providing image picking-up for an optical chassis. An adjustable suppressing mechanism located at the guiding groove in corresponding to the scanning window may drive the object to be scanned to pass through an optimal depth of field height of the scanning window. First, at least a part of the pre-scanned object is fed in to be located between the adjustable suppressing mechanism and the scanning window. The depth of field height is then adjusted and changed by the adjustable suppressing mechanism. And, the image of the pre-scanned object is compared with a pre-stored image. After the pre-scanned objected has been judged to be located at the optimal depth of field height, the adjustable suppressing mechanism is fixed and the pre-scanned object is sent out. Then, it may achieve a most clear image picking-up for scanning the object to be scanned.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.