Optical device and imaging apparatus with position sensors and coil motors

An optical device comprising:

• a first lens frame that holds a first focus lens for focusing a subject image and is moved in a direction of an optical axis of the first focus lens;
• a second lens frame that is disposed so as to be spaced from the first focus lens in the direction of the optical axis, holds a second focus lens for focusing the subject image, and is moved in the direction of the optical axis;
• a blur-correction lens frame that holds a blur-correction lens disposed between the first focus lens and the second focus lens and is moved in a direction orthogonal to the optical axis of the first focus lens;
• a first voice coil motor that includes a first drive magnet, a first yoke, and a first coil mounted on the first lens frame and moves the first lens frame in the direction of the optical axis in a case in which current flows in the first coil;
• a second voice coil motor that includes a second drive magnet, a second yoke, and a second coil mounted on the second lens frame and moves the second lens frame in the direction of the optical axis in a case in which current flows in the second coil;
• a third voice coil motor that includes a third drive magnet, a third yoke, and a third coil mounted on the blur-correction lens frame and moves the blur-correction lens frame in a first direction in a plane orthogonal to the optical axis in a case in which current flows in the third coil;
• a fourth voice coil motor that includes a fourth drive magnet, a fourth yoke, and a fourth coil mounted on the blur-correction lens frame and moves the blur-correction lens frame in a second direction orthogonal to the first direction in a plane orthogonal to the optical axis in a case in which current flows in the fourth coil;
• a first position sensor that magnetically detects a position of the first lens frame in the direction of the optical axis;
• a second position sensor that magnetically detects a position of the second lens frame in the direction of the optical axis;
• a third position sensor that magnetically detects a position of the blur-correction lens frame in the first direction;
• and
• a fourth position sensor that magnetically detects a position of the blur-correction lens frame in the second direction,
• wherein in a case in which a line connecting the first position sensor to the optical axis is set as a first reference line and a line orthogonal to the first reference line and passing through the optical axis is set as a second reference line in a state in which the first position sensor, the second position sensor, the third voice coil motor, and the fourth voice coil motor are viewed in the direction of the optical axis, the first position sensor and the second position sensor are arranged in a first region of the first region and a second region partitioned by the second reference line and the third drive magnet and the third yoke of the third voice coil motor and the fourth drive magnet and the fourth yoke of the fourth voice coil motor are arranged in the second region.