JPS54150699A - Manufacture of roll-like magnet - Google Patents

Abstract

PURPOSE:To provide a compact magnet of high flux density, by mixing ferrite particles with a medium, rolling the mixture to a sheet wherein the magnetically anisotropic ferrite particles are magnetically oriented in the direction of the rolling, shaping the sheet as a columnar roll and magnetizing the central parts of the sides of the roll. CONSTITUTION:The scale-shaped ferrite particles 1 which are made magnetically anisotropic are mixed with the binding medium 2 such as rubber or synthetic resin. The mixture is rolled between rotating rolls 3 to make the anisotropic sheet 4 wherein the ferrite particles 1 are oriented in the direction of the rolling and which shows a ferromagnetic property in the thickness direction A rather than in the length direction B. The sheet 4 is wound under pressure on a shaft 5 of square cross section so that the roll 6 of square cross section is manufactured. This roll is magnetized by magnetizing yokes 8. The magnetic flux density on the surface of the roll magnet can be raised to 1200 gauss. The size and weight of the roll magnet can be reduced.