Rotational driving device, image capturing device, and network camera system

An image capturing device comprising:

• an image capturing element that performs photoelectric conversion on light from an object and outputs a pixel signal;
• a lens unit that forms an image on the image capturing element based on light from the object;
• a rotation body that includes an optical member that is inclined at a predetermined angle with respect to an optical axis of the lens unit;
• and a supporting ring configured with a magnetic body disposed on an outer peripheral side of the optical member;
• and
• a rotational driving device that displaces an optical image formed on a light-receiving surface of the image capturing element relative to the image capturing element by changing the inclination direction of the optical member with respect to the optical axis by rotating the rotation body, the rotational driving device comprising:
• a first magnetizer that is provided to the supporting ring and faces an outer peripheral surface of the supporting ring;
• a second magnetizer that is provided to the supporting ring and faces a first end surface of the supporting ring in a axial direction;
• a third magnetizer that is provided to the supporting ring and faces a second end surface of the supporting ring in the axial direction;
• a first position controller that maintains a radial-direction position of the optical member by applying a radial-direction magnetic force to the first magnetizer;
• a second position controller that maintains an axial-direction position of the optical member by applying an axial-direction magnetic force to at least one of the second magnetizer and the third magnetizer;
• and
• a magnetic rotation driver that rotates the optical member by applying a rotation-direction magnetic force to the first magnetizer, and
• wherein, the first magnetizer is magnetized in a polar anisotropy orientation and faces a central portion in the axial direction of an outer peripheral surface of the supporting ring.