Patent ID: 9729738
Date: 2017-08-08
CPC Classifications: G07D,H04N

Claim:
1. An image reading device comprising: a magnetic circuit configured to generate a magnetic field in a first magnetic reading area on a conveyance plane in a direction perpendicular to the conveyance plane, the magnetic circuit comprising a magnet disposed on one side of the conveyance plane on which a sheet-like medium to be read containing a magnetic component is conveyed along the direction of the sheet surface and the magnet having different magnetic poles in a direction perpendicular to the conveyance plane, and a yoke disposed at the magnetic pole on the side of the conveyance plane of the magnet; a magnetoresistive effect element configured to detect a strength change of a conveyance direction component of the magnetic field in the first magnetic reading area when the medium to be read is conveyed on the conveyance plane, the magnetoresistive effect element being disposed between the magnetic circuit and the conveyance plane; a first light source configured to irradiate light onto the first magnetic reading area on the conveyance plane, the first light source being disposed on a side opposite to the magnetic circuit side with respect to the conveyance plane; and a first image forming optical system and a first light receiver disposed on the side opposite to the magnetic circuit side with respect to the conveyance plane, wherein the first image forming optical system forms an image of a first optical reading area including at least a portion of the conveyance direction first magnetic reading area on the conveyance plane at the first light receiver.