Abstract: An optical unit includes a first barrel, a second barrel, a third barrel, and a position detection unit. Eight magnets including first and second magnets are fixed to the first barrel. A first and second coils are fixed to the second barrel. The position detection unit includes a magnetic sensor configured to detect magnetic fields generated by the first and second magnets and to generate a detection signal having a corresponding relation with a position of the first barrel. The third barrel includes a position defining surface parallel to a moving direction of the first barrel. The position detection unit is fixed to the position defining surface.

Abstract: An optical device includes: an optical system including a moving lens that moves in a direction along an optical axis; a moving frame including a first magnetic body and configured to hold the moving lens; a holding frame formed into a cylindrical shape by a non-magnetic body and configured to movably hold the moving frame on an inner circumferential surface along the optical axis, a drive unit including a magnet and configured to cause the moving frame to move in the direction along the optical axis; and second magnetic bodies arranged between the drive unit and the moving frame and configured to transmit a magnetic force of the magnet to the first magnetic body of the moving frame.

Abstract: An optical unit includes a first barrel, a second barrel, a third barrel, and a position detection unit. Eight magnets including first and second magnets are fixed to the first barrel. A first and second coils are fixed to the second barrel. The position detection unit includes a magnetic sensor configured to detect magnetic fields generated by the first and second magnets and to generate a detection signal having a corresponding relation with a position of the first barrel. The third barrel includes a position defining surface parallel to a moving direction of the first barrel. The position detection unit is fixed to the position defining surface.