Image pickup apparatus for focusing an object image based on mirror reflected height of the object
US5416609A · kind A · utility
83Cited by
6References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 6, 1993 |
| Grant date | May 16, 1995 |
| Priority date | — |
| Expiry date | May 6, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0436
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image pickup apparatus for reading an object having a curved document surface such as an opened book, constructed to focus an optical system all the object. A line sensor is moved for scanning the object, thereby a distance between the line sensor and the object is measured, and the object is imaged while controlling an optical system based on data of measured distance so that an object image is in focus on the line sensor. This allows all over the object surface to be in focus, whereby the clear image without blur is obtainable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.