| 摘要 |
PURPOSE:To maintain a spring constant at a specified value, by a method wherein each magnet piece forms a ring body, magnetization is effected from the inner peripheral surface of the ring body toward the outer peripheral surface thereof or from the outer peripheral surface thereof toward the inner peripheral surface thereof, and central axes thereof are disposed on the same and one axis. CONSTITUTION:A plurality of magnet pieces 2 each formed in an annular shape are aligned in a hold case 1, and an inner peripheral surface is magnetized to form an N-pole and an outer peripheral surface to form a S-pole. Magnetic lines of force emitted from the inner peripheral surface to the outer peripheral surface are generated around each magnet piece 2, and the magnet pieces are repelled from each other by means of magnetic lines of a force generated from a pair of the adjoining magnet pieces 2 and 2. This constitution enables reduction of the intensity of a demagnetizing field by increasing a size, ranging from the inner peripheral surface to the outer peripheral surface of the magnet piece 2, to a value in an allowable range, resulting in the possibility to maintain the spring constant of a magnet spring at a specified value for a long period. |
