Image reader with focus and magnification detection control
US4751376A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1986 |
| Grant date | Jun 14, 1988 |
| Priority date | — |
| Expiry date | Apr 11, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/393
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is disclosed an image reader in which the reading magnification can be changed optically to a value designated. The image reader provides a device for adjusting the reading magnitude by moving a lens in the direction of the optical axis thereof and adjusting the focusing by shifting the image sensor relative to the lens. Further, the image reader provides a device for measuring the magnification and calculates amounts of movements for the lens and image sensor respectively based upon the measured magnification and the designated magnification. The lens and image sensor are moved respectively by the amount calculated to give the designated magnification in the focused state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.