Camera module

A camera module comprising:

• a lens barrel configured to be movable;
• a detection target configured to be movable with the lens barrel;
• an integrated coil facing the detection target;
• a reference coil facing the detection target;
• a shielding layer disposed between the reference coil and the detection target;
• a driver configured to apply a driving signal to the integrated coil;
• and
• a position detector configured to detect a position of the lens barrel according to an inductance of the integrated coil and an inductance of the reference coil.

A camera module comprising:

• a lens barrel configured to be movable;
• a detection target disposed on the lens barrel;
• an integrated coil and a sensing coil disposed facing the detection target in a direction perpendicular to a direction of an optical axis of the lens barrel;
• a driver configured to apply a driving signal to the integrated coil to drive the lens barrel in the optical axis direction;
• and
• a position detector configured to detect a position of the lens barrel in the optical axis direction according to an inductance of the integrated coil and an inductance of the sensing coil,
• wherein a geometry of the integrated coil causes the inductance of the integrated coil to change in a first direction as the lens barrel moves in the optical axis direction, and
• a geometry of the sensing coil causes the inductance of the sensing coil to change in a second direction opposite to the first direction as the lens barrel moves in the optical axis direction.

A camera module comprising:

• a lens barrel configured to be movable;
• a detection target disposed on the lens barrel;
• an integrated coil and a reference coil disposed facing the detection target in a direction perpendicular to a direction of an optical axis of the lens barrel;
• a driver configured to apply a driving signal to the integrated coil to drive the lens barrel in the direction perpendicular to the optical axis direction;
• and
• a position detector configured to detect a position of the lens barrel in the direction perpendicular to the optical axis direction according to an inductance of the integrated coil and an inductance of the reference coil,
• wherein the inductance of the integrated coil changes as the lens barrel moves in the direction perpendicular to the optical axis direction, and
• the inductance of the reference coil remains substantially constant as the lens barrel moves in the direction perpendicular to the optical axis direction.