Patent ID: 11954550
Assignee: NIDEC SANKYO CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A card reader comprising:
a card insertion slot through which a card having a magnetic stripe is inserted;
a card movement path along which the card inserted through the card insertion slot moves; and
an interfering magnetic field generation mechanism that generates a magnetic field for defeating unauthorized reading of magnetic data recorded on the magnetic stripe,, wherein
the interfering magnetic field generation mechanism comprises: a first core part, a second core part, and a third core part, each of which is formed of soft magnetic material in a straight line; a first coil that is a coil wound around the first core part; a second coil that is a coil wound around the second core part and being connected with the first coil in series; a third coil that is a coil wound around the third core part; a first drive circuit that supplies alternating current to the first coil and the second coil; and a second drive circuit that supplies alternating current to the third coil,
the first core part, the second core part, and the third core part are disposed on one side relative to the card movement path in a thickness direction of the card that moves along the card movement path,
the third core part is disposed between the first core part and the second core part, when viewed in the thickness direction of the card,
when alternating current is supplied to the first coil and the second coil, an AC magnetic field is generated in which a direction of magnetic lines of force fluctuates between: a direction from a first end face that is one end face of the first core part to a second end face that is one end face of the second core part; and a direction from the second end face to the first end face, and
the third core part is formed independently of the first core part and the second core part, and is separated from the first core part and the second core part.