Patent ID: 8305655
Filing Date: 2012-11-06
Classification: H04N

Abstract:
1. An image reading device comprising: a document reading unit having an illumination mechanism that illuminates a document, the illumination mechanism having first and second groups of light-emitting elements, each of said groups including a plurality of light-emitting elements arranged in a row along a main scanning direction, said first and second groups being arranged side by side in a sub-scanning direction that is orthogonal to said main-scanning direction, and said document reading unit reading optically an image of the document illuminated by the illumination mechanism via a document glass that extends in the main scanning direction in a predetermined document reading position; a document conveying unit that conveys the document in the sub-scanning direction of the document reading unit with respect to the document reading position; a foreign-matter image position detection unit that detects a predetermined foreign-matter image from the image read by the document reading unit when the document conveyed by the document conveying unit comes off from the document reading position and detects a main scanning direction position of the foreign-matter image in the main scanning direction; and a lighting control unit that lights up, in a first light emission mode, those light-emitting elements of the first group that are within a predetermined range from the main scanning direction position of the foreign-matter image; and lights up, in a second light emission mode that is different from the first light emission mode, those light-emitting elements in the first and second groups other than the light emitting elements in the first group that are within said predetermined range when the foreign-matter image is detected by the foreign-matter image position detection unit.