Patent ID: 7104707

Claim:
A light quantity adjusting device comprising: an annular rotary member having a magnetizing portion in a plane that is parallel to a radial direction of the annular rotary member; an annular coil disposed in an outer diameter side or an inner diameter side of the rotary member; an annular first stator disposed in a direction that is orthogonal to a radial direction of the rotary member, the annular first stator comprising first magnetic pole portions that oppose the rotary member; an annular second stator disposed in a direction that is orthogonal to the radial direction of the rotary member, the annular second stator comprising second magnetic pole portions that oppose the rotary member from an opposite side of the first magnetic pole portions; and one or more light controlling members that are disposed between the rotary member and the first stator and/or between the rotary member and the second stator and that move into, and out of, a light path according to rotation of the rotary member, controlling the quantity of light that passes through, the light path being a path for light passing therethrough opening portions of the rotary member, the coil, the first stator, and the second stator.