| 摘要 |
An electromagnetic actuator for driving the shutter of a camera includes a rotor (10) magnetized with the N and S poles, and first magnetic pole parts (21, 31) and second magnetic pole parts (22, 32) that are disposed to face the outer circumferential surface of the rotor (10) and generate mutually different magnetic poles when an electric current is applied to the coil (40), in which an output pin (11) of the rotor (10) is magnetized with one of the N and the S poles and forms a projection that projects outward in the radial direction, and, in the vicinity of the first magnetic pole part (31), an auxiliary magnetic pole piece (33) is provided that is disposed near the output pin (11) serving as a projection when the rotor (10) is located at an initial position and that generates the same magnetic pole as the first magnetic pole part (31) in a current-running state. Therefore, a maintaining force can be raised especially in a current-stopped state, and a driving force can be raised.
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