| 摘要 |
PROBLEM TO BE SOLVED: To provide a small ring magnet having high characteristics and suitable as a magnet for the shutter of a camera, for example. SOLUTION: A resin coating is formed on the surface of a ring-like rare earth sintered magnet having a weight of 1 g or less. The resin coating is an epoxy resin coating, for example. The rare earth sintered magnet is a neodymium iron boron based magnet containing R (R is a concept of one or two or more rare earth elements containing Y), T (T is Fe or one or two or more transient metal elements where Fe and Co are essential), and B (boron). The small ring magnet is employed as the rotor of a moving magnet motor for driving the shutter of a camera, for example. COPYRIGHT: (C)2006,JPO&NCIPI
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