| 摘要 |
PURPOSE:To provide an electronic lens magnet which is manufactured at a low cost and excellent in magnetic properties and moldability and a treating method thereof. CONSTITUTION:Plastic magnet material containing 30 to 70% by weight of magnet powder which is mainly composed of iron, aluminum, nickel, and cobalt and as large in average grain diameter as 40 to 100mum is molded into a plastic magnet. Provided that a final magnetization value is 100%, a plastic magnet is magnetized higher than a final magnetization value b 110 to 140% in a primary magnetizing process, then magnetized lower than a final magnetization value by -10 to -30% in a second magnetizing process so as to be kept equal in remanence to a final magnetization value, and then subjected to an aging process at a temperatures of 80 to 120 deg.C. |
