Patent ID: 6853280
Filing Date: 2005-02-08
Classification: H01F

Abstract:
1. A method of magnetizing a magnetic sheet comprising the steps of: bringing a cylindrical permanent magnet having a plurality of N-poles and S-poles alternately arranged along its circumference into contact with a surface of a magnetic sticking sheet having an axis of easy magnetization oriented in a sheet longitudinal direction wherein the permanent magnet is comprised of individual magnet portions having a line from an N-pole to an S-pole perpendicular to a core of the cylinder, the magnetic portions extending parallel to an axis of rotation, and rolling the magnetic sticking sheet in the sheet longitudinal direction to make the cylindrical permanent magnet contacting the magnetic sticking sheet rotate and multipolar-magnetize the magnetic sticking sheet along the axis of easy magnetization, wherein wherein an angle between a normal line to a surface of the magnetic sticking sheet at an initial point of contact with the cylindrical permanent magnet and a normal line to a surface of the magnetic sticking sheet at a final point of contact is 45° or less.