| 摘要 |
PROBLEM TO BE SOLVED: To provide an incident-light adjusting apparatus in which, it is possible to make small all the component members by using a coil of extremely small size. SOLUTION: The incident-light adjusting apparatus has a first aperture 103 formed in a substrate, and a diaphragm blade 201 (incident-light adjusting means) which rotates around an axis of rotation as a center, and which controls light incident upon passing through the first aperture 103, by the diaphragm blade 201 rotating alternately between a first static position which coincides with the first aperture 103 and a second static position retracted from the first aperture 103, includes a permanent magnet 301 which is joined directly to the diaphragm blade 201, at a position of the axis of rotation of the diaphragm blade 201, and which is magnetized in a direction of a plane of rotation of the diaphragm blade 201, and a pair of coils 402 and 404, having a winding around cores 401 and 403 respectively, and disposed such that an end portion of each coil is facing the permanent magnet 301. The diaphragm blade 201 is rotated alternately between the first static position and the second static position due to an interaction between a magnetic field which is generated due to an energized state of the coils 402 and 404, and a magnetic field which is generated due to the permanent magnet 301. COPYRIGHT: (C)2009,JPO&INPIT
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