Position detection unit, lens module, and imaging apparatus

A lens module comprising:

• a magnetic sensor;
• a first magnetic field generator spaced from and opposed to the magnetic sensor in a first-axis direction, including a first multipolar magnet and generating a first magnetic field to be exerted on the magnetic sensor, the first multipolar magnet including a plurality of N poles and a plurality of S poles, the N and S poles being adjacent to each other along a plane orthogonal to the first-axis direction;
• a second magnetic field generator generating a second magnetic field;
• and
• a lens, wherein
• the first magnetic field generator and the lens are relatively movable with respect to the magnetic sensor and the second magnetic field generator along a second-axis direction orthogonal to the first-axis direction, and
• a center position of the magnetic sensor in a third-axis direction orthogonal to both of the first-axis direction and the second-axis direction is different from a position in the third-axis direction of an interface between the N and S poles adjacent to each other in the third-axis direction.

An imaging apparatus including

• an imaging element, and
• a lens module,
• the lens module comprising:
• a magnetic sensor;
• a first magnetic field generator spaced from and opposed to the magnetic sensor in a first-axis direction, including a first multipolar magnet and generating a first magnetic field to be exerted on the magnetic sensor, the first multipolar magnet including a plurality of N poles and a plurality of S poles, the N and S poles being adjacent to each other along a plane orthogonal to the first-axis direction;
• a second magnetic field generator generating a second magnetic field;
• and
• a lens, wherein
• the first magnetic field generator and the lens are relatively movable with respect to the magnetic sensor and the second magnetic field generator along a second-axis direction orthogonal to the first-axis direction, and
• a center position of the magnetic sensor in a third-axis direction orthogonal to both of the first-axis direction and the second-axis direction is different from a position in the third-axis direction of an interface between the N and S poles adjacent to each other in the third-axis direction.