Camera drive device

1. A camera driving apparatus, comprising:

a camera section including an imaging element having an imaging plane, a lens which has an optical axis and forms an image of a subject on the imaging plane, and a lens barrel for holding the lens;

a fixed unit including a protrusion section which is formed of a magnetic member at least partially and has a shape of a part of a spherical face;

a movable unit for supporting the camera section, the movable unit including an attracting magnet for generating a magnetic attracting force for the magnetic member, and a conical contact face with which the protrusion section is loosely engageable and contactable by the magnetic attracting force, the movable unit being freely pivotable with respect to a sphere center of the spherical face of the protrusion section;

a panning driving section for inclining the camera section with respect to the fixed unit in a panning direction;

a tilting driving section for inclining the camera section with respect to the fixed unit in a tilting direction which is perpendicular to the panning direction;

a rolling driving section for rotating the camera section with respect to the fixed unit in a rolling direction centered around the optical axis of the lens;

a detector for detecting an inclining angle of the camera section with respect to the fixed unit in the panning and tilting directions and a rotating angle of the camera section in the rolling direction; and

a line for electrically connecting the camera section and an external circuit to each other, the line being spirally wound around the protrusion section.

2. The camera driving apparatus of claim 1 , wherein the line includes at least two flexible printed wiring plates, and the at least two flexible printed wiring plates have an axial symmetrical structure with respect to the optical axis obtained when the movable unit is at a neutral position.

3. The camera driving apparatus of claim 2 , wherein the detector includes:

a first detection section for detecting an inclining angle of the camera section with respect to the fixed unit in the panning and tilting directions; and

a second detection section for detecting a rotating angle of the camera section in the rolling direction.

4. The camera driving apparatus of claim 3 , wherein:

the first detection section includes a first magnetic sensor fixed to the fixed unit; and

the first magnetic sensor detects a change of a magnetic force caused by inclination of the attracting magnet provided in the movable unit to calculate a two-dimensional inclining angle of the camera section in the panning and tilting directions.

5. The camera driving apparatus of claim 4 , wherein:

the second detection section includes:

a pair of rotation detection magnets fixed to the fixed unit; and

a pair of second magnetic sensors respectively attached to the at least two flexible printed wiring plates; and

the pair of second magnetic sensors detect a change of a magnetic force caused by a mutual rotating motion of the rotation detection magnets to calculate a rotating angle of the camera section.

6. The camera driving apparatus of claim 5 , wherein the pair of second magnetic sensors are located symmetrically with respect to the sphere center on a straight line which is on a plane perpendicular to the optical axis of the lens and passes the sphere center, and the pair of rotation detection magnets are located symmetrically with respect to the sphere center on a straight line which is on a plane perpendicular to the optical axis of the lens and passes the sphere center.

7. The camera driving apparatus of claim 5 , wherein the pair of rotation detection magnets each include two magnetic poles, magnetized oppositely to each other, on a straight line which is on a plane perpendicular to the optical axis of the lens and passes the sphere center, and the two magnetic poles are arranged on a circumference of a circle centered around the optical axis.

8. The camera driving apparatus of claim 2 , wherein the flexible printed wiring plates has a rounded shape or a bent shape in the vicinity of an end thereof connected to the camera section.

9. The camera driving apparatus of claim 1 , further comprising a fall preventive member including a fall preventive regulation section distanced from the movable unit by a prescribed gap in a direction of the optical axis, the fall preventive member being fixed to the fixed unit.