Patent ID: 9001395
Filing Date: 2015-04-07
Classification: H04N

Abstract:
1. An image reading device comprising: illuminating means for illuminating a reading position where a sheet is conveyed along a conveyor path; optical reading means for reading reflected light of the sheet illuminated by the illuminating means, when the sheet passes the reading position; a white reference plate disposed opposite to the optical reading means with the reading position sandwiched therebetween; a moving structure to move the illuminating means so that an illuminating angle and a Y direction moving distance are changed, the illuminating angle being an angle which an illumination optical axis of the illuminating means makes with respect to the conveyor path, and the Y direction being a lengthwise direction of an illumination optical axis while maintaining the illuminating angle, the moving structure including: input means for inputting a sheet type or a thickness information of the sheet which are read by the optical reading means; and control means for controlling the moving structure based on the sheet type of the sheet or the thickness information of the sheet input by the input means to change the illuminating angle and the Y direction moving distance of the illuminating means, wherein the control means has a table storing the illuminating angle and Y direction moving distance which correspond to the sheet type or the thickness information of the sheet, and the control means sets the illuminating angle moving amount and the Y direction moving amount, which are read from the table based on the sheet type or thickness information of the sheet, in the illuminating angle moving means and the Y direction moving means, respectively.