Patent ID: 8174344

Claim:
A linear electromagnetic actuator for displacing a movable section including permanent magnets by a thrust force generated by allowing a current to flow through a coil of a fixed section, wherein said movable section has a first yoke for supporting said permanent magnets, said fixed section has a second yoke for supporting said coil facing said permanent magnets while being separated therefrom, a first projection and a second projection are formed on both sides of said first yoke protruding toward said second yoke and extending in a direction of displacement of said movable section, a third projection and a fourth projection are formed on both sides of said second yoke protruding toward said first yoke and extending along directions parallel to said first projection and said second projection, said first projection and said second projection are slightly separated from said second yoke, a first guide member is interposed between said first projection and said second yoke, and a second guide member is interposed between said second projection and said second yoke, wherein each of said first guide member and said second guide member is composed of a plurality of rolling members, and a part of said rolling members are first rolling members composed of magnetic members.