Abstract: A lens drive device of the invention is disclosed comprising a motor drive for each lens of zoom means and focusing means, whereby a motor is made to have a concentric layer structure about a photographic optical axis, and a single magnetic circuit for the motor having the aforesaid layer structure is formed by a single permanent magnet.

Abstract: A motor in which a coil constituting a rotor is integrally formed with self-lubricating resin or oil-containing resin to construct a portion of a bearing, which is utilized as a part of a roller or sliding bearing.

Abstract: A bearing member of a ring-shaped lubrication member made of a resin material is arranged between a ring-shaped stator having an excitation coil and pole teeth and a ring-shaped magnet rotor arranged inside of the stator, and the stator, magnet rotor and the lubrication member are held in union by holding members to form a motor.

Abstract: There is disclosed a lens barrel incorporating a motor comprising a permanent magnet, a hollow cylindrical coil and a hollow yoke member arranged in the stated order or in an inverted order inside a fixed tube of the lens barrel, wherein a commutator is provided on the internal periphery of an end aperture of the hollow cylindrical coil while brushes are provided on the facing external periphery of the hollow magnet or yoke member, and the hollow cylindrical coil is supported at the end apertures by bearing members, and further comprising a frame supporting an imaging lens in helicoidal coupling with an annular member fixed to the hollow cylindrical coil and internally provided with a helicoid.