Image reading apparatus and image forming apparatus
US9100510B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 2012 |
| Grant date | Aug 4, 2015 |
| Priority date | — |
| Expiry date | Jun 7, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0081
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image reading apparatus include a light source; an image sensor configured to output an image signal of an object illuminated by the light source; a first calculating unit configured to calculate a third light amount based on a difference between a first image signal output from the image sensor when the light source illuminates a reference member as the object at a first light quantity and a second image signal output from the image sensor when the light source illuminates the reference member at a second light quantity and a difference between the first light quantity and the second light quantity; and a light quantity setting unit configured to set a light quantity at which the light source illuminates a document as the object to the third light quantity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.