| 摘要 |
The present invention relates to an electromagnet apparatus having a coil wound around a bobbin, a core fixed to and supported by the bobbin to cover at least a portion of the surface of the coil and having a slant serving as a first pole head, the force of which acts in a direction of the surface of the coil, and a rotatively supported around a center of winding of the coil around the bobbin and having a slant serving as a second pole head, the force of which acts in a direction of the surface of the bobbin, wherein the slant of the core and that of the rotor are disposed to face each other with a predetermined air gap maintained with which the rotor is able to attractively rotate with respect to the core. The present invention also relates to an exposure adjusting apparatus having a bobbin in the form of a cylinder through which a photographing light beam is able to pass and around which a coil comprising an insulating and coated conductive wire is wound, a core fixed to and supported by the bobbin to cover at least a portion of the surface of the coil around the bobbin and having a V-shaped cut portion serving as a first pole head, the force of which acts in a direction of the surface of the coil, a rotor rotatively supported around the center of winding of the coil and having a V-shaped projection opposing the V-shaped cut portion of the core.
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