Abstract: A focus controller configured to control focus of an optical system that has a focus lens includes a switching circuit configured to select a first driver for the electrization to a coil of a motor in performing focus control using a first focus detector, and to select a second driver in an electrization to the coil of the motor in performing focus control using a second focus detector. The first driver is configured to switch an electrization to the coil in the motor according to an output of the position sensor. The second driver is configured to switch an electrization to the coil of the motor according to a determined time interval.

Abstract: In a motor driving apparatus, an incline of boundary lines of magnetic poles with respect to a rotating shaft of a rotor and an incline in a movable direction of a magnetic detection unit with respect to the rotating shaft of the rotor are different.

Abstract: A drive apparatus includes a magnet rotor having a plurality of magnetic poles that are magnetized, a stator having a magnetic pole portion that opposes each pole of the magnet rotor, a coil configured to excite the magnetic pole portion, a position detector configured to detect a position of the magnet rotor, a first driver configured to switch an electrification state of the coil in accordance with a preset time interval, a second driver configured to switch an electrification state of the coil in accordance with an output of the position detector, and a controller configured to select the first driver when the output of the position detector is less than a first threshold, and to select the second driver when the output of the position detector is equal to or larger than the first threshold.

Abstract: A driving device which makes it possible to reduce the moment of inertia of a rotor and increase torque. A magnet is formed to have a hollow cylindrical shape and has magnetized sections which are magnetized to have alternately different poles in a circumferential direction thereof. A coil is wound coaxially with the magnet and is disposed in axially side-by-side relation to the magnet. A stator yoke is formed of a soft magnetic material and fixes the magnet and the coil. A rotor yoke is formed of a soft magnetic material, and has magnetic pole portions formed in opposed relation to the magnetized sections, for being magnetized by the coil. The rotor yoke is supported in a manner rotatable with respect to the stator yoke. An rotation restricting part limits a range of rotation of the rotor yoke within a predetermined angle.

Abstract: A driving apparatus includes a first magnet, second magnet, stator, first coil, second coil, first bearing, second bearing and rotor. The first and second magnets respectively have a magnetized portion in which S pole and N pole are alternately magnetized. The rotor has a magnetic pole portion opposite to each magnetized portion. The stator fixes the first magnet and second magnet to the same axis to rotatably support the rotor. The first coil magnetically excites a portion where the magnetic pole portion of the rotor faces the first magnet. The second coil magnetically excites a portion where the magnetic pole portion of the rotor faces the second magnet. Thereby, a driving apparatus is provided which stabilizes the quality by simplifying the configuration of a rotor and makes it possible to realize high speed of rotation and improvement of response speed by decreasing the moment of inertia of a rotor.

Abstract: A drive apparatus having a shortened axial dimension. First and second magnets are each formed into a semi-cylindrical shape and each provided with a magnetized pattern portion. A rotor yoke includes a shaft portion and a magnetic pole portion facing magnetized surfaces of the magnets. First and second stator yokes are each disposed to cooperate with the rotor yoke to sandwich therebetween a part of the first or second magnet where the magnetized pattern portion is formed. First and second coils each magnetize a part of the magnetic pole portion of the rotor yoke which faces the first or second stator yoke.

Abstract: A lens barrel drive apparatus which can be reduced in outside diameter to realize reduced diameter. A guide bar guides a lens along an optical axis. Hollow magnets are disposed on an outer peripheral side of the lens and have magnetized portions alternately magnetized to different poles in the circumferential direction. A cylindrical rotor is disposed rotatably with respect to the magnets, made of a soft magnetic material, and is comprised of magnetic pole portions opposed to the magnetized portions of the magnets. A coil energizes the magnetic pole portions of the rotor. A stator fixes the magnets and the coil. A conversion unit adapted to convert rotating movements of the rotor into forward and backward movements of the lens along the optical axis. The magnets have breaks formed along the optical axis, and the guide bar is disposed in the break of the magnets.

Abstract: A brushless DC motor configured to drive a driven member includes a rotor having a magnet, a stator having a coil configured to provide a rotational force to the magnet, a position detector configured to output a first signal that is periodic, in accordance with a rotating position of the rotor, a signal generator configured to generate a second signal by adding a lead angle to a phase of the first signal output from the position detector, an excitation switch configured to select an excitation to the coil in accordance with the second signal, and a phase change part configured to change the lead angle in accordance with at least one of a position and a moving direction of the driven member.

Abstract: A driving apparatus includes a first magnet, second magnet, stator, first coil, second coil, first bearing, second bearing and rotor. The first and second magnets respectively have a magnetized portion in which S pole and N pole are alternately magnetized. The rotor has a magnetic pole portion opposite to each magnetized portion. The stator fixes the first magnet and second magnet to the same axis to rotatably support the rotor. The first coil magnetically excites a portion where the magnetic pole portion of the rotor faces the first magnet. The second coil magnetically excites a portion where the magnetic pole portion of the rotor faces the second magnet. Thereby, a driving apparatus is provided which stabilizes the quality by simplifying the configuration of a rotor and makes it possible to realize high speed of rotation and improvement of response speed by decreasing the moment of inertia of a rotor.

Abstract: A focus controller configured to control focus of an optical element includes a focus state detector configured to detect a focus state based on a contrast value of an image formed by the optical element, and a driving mechanism that moves the optical element including a motor, a position sensor configured to detect a position of a rotor in the motor, and a driving controller configured to select, in accordance with the contrast value, first driving configured to switch an electrization to a coil in accordance with an output of the position senor, or second driving configured to switch the electrization to the coil in the motor in accordance with a determined time interval.

Abstract: An optical apparatus having a recording mode that is switchable between motion picture recording and still picture recording includes an optical element, a motor that includes a rotor having a magnet, and a stator having a coil configured to provide a rotational force to the magnet, the motor being configured to drive the optical element, a position sensor configured to detect a position of the rotor of the motor, and a driving circuit configured to select, in accordance with the recording mode, first driving configured to switch an electrization to the coil in the motor in accordance with a determined time interval, or second driving configured to switch an electrization to the coil in the motor in accordance with an output of the position senor.

Abstract: A light amount adjusting device mounted with a driving device which can have a reduced size in the direction of thickness. In this controller, a magnet is formed into a hollow circular disk shape and has at least one disk surface magnetized to have alternately different poles in the circumferential direction thereof. A rotor yoke is supported by a bobbin for rotation relative to the magnet, and has magnetic pole parts extending radially of the magnet and facing the magnetized disk surface of the magnet. A stator yoke is disposed on the side remote from the rotor yoke with respect to the magnet and fixed with the magnet. A coil is fixed to the stator yoke and magnetizes the magnetic pole parts of the rotor yoke. Shutter blades are disposed radially inside the magnet.

Abstract: A focus controller configured to control focus of an optical system that has a focus lens includes a switching circuit configured to select a first driver for the electrization to a coil of a motor in performing focus control using a first focus detector, and to select a second driver in an electrization to the coil of the motor in performing focus control using a second focus detector. The first driver is configured to switch an electrization to the coil in the motor according to an output of the position sensor. The second driver is configured to switch an electrization to the coil of the motor according to a determined time interval.

Abstract: A lens barrel drive apparatus which can be reduced in outside diameter to realize reduced diameter. A guide bar guides a lens along an optical axis. Hollow magnets are disposed on an outer peripheral side of the lens and have magnetized portions alternately magnetized to different poles in the circumferential direction. A cylindrical rotor is disposed rotatably with respect to the magnets, made of a soft magnetic material, and is comprised of magnetic pole portions opposed to the magnetized portions of the magnets. A coil energizes the magnetic pole portions of the rotor. A stator fixes the magnets and the coil. A conversion unit adapted to convert rotating movements of the rotor into forward and backward movements of the lens along the optical axis. The magnets have breaks formed along the optical axis, and the guide bar is disposed in the break of the magnets.

Abstract: In a motor driving apparatus, an incline of boundary lines of magnetic poles with respect to a rotating shaft of a rotor and an incline in a movable direction of a magnetic detection unit with respect to the rotating shaft of the rotor are different.

Abstract: A driving device easy to manufacture. A slider formed of a soft magnetic material has spiral threads running along an axial direction of the slider. A stator formed of a soft magnetic material supports the slider movably along the axial direction. First and second coils fixed to the stator magnetize those portions of the spiral threads which are in first and second areas of the slider. Each of first and second magnets fixed to the stator has a magnetized surface thereof opposed to a corresponding one of the first and second areas and magnetized in a shape corresponding to a shape of the spiral threads.

Abstract: A controller for a motor driving apparatus switches a direction of electricity flowing through a first coil according to a first lead angle signal obtained based on a first magnetic pole detecting signal and a second magnetic pole detecting signal. The controller switches a direction of electricity flowing through a second coil according to a second lead angle signal obtained based on the first magnetic pole detecting signal and the second magnetic pole detecting signal. Thus, a motor driving apparatus can be configured such that the angle of the rotation center of the rotor with respect to two magnetically sensitive poles can freely be selected.

Abstract: A drive apparatus having a shortened axial dimension. First and second magnets are each formed into a semi-cylindrical shape and each provided with a magnetized pattern portion. A rotor yoke includes a shaft portion and a magnetic pole portion facing magnetized surfaces of the magnets. First and second stator yokes are each disposed to cooperate with the rotor yoke to sandwich therebetween a part of the first or second magnet where the magnetized pattern portion is formed. First and second coils each magnetize a part of the magnetic pole portion of the rotor yoke which faces the first or second stator yoke.

Abstract: A lens barrel drive apparatus which can be reduced in outside diameter to realize reduced diameter. A guide bar guides a lens along an optical axis. Hollow magnets are disposed on an outer peripheral side of the lens and have magnetized portions alternately magnetized to different poles in the circumferential direction. A cylindrical rotor is disposed rotatably with respect to the magnets, made of a soft magnetic material, and is comprised of magnetic pole portions opposed to the magnetized portions of the magnets. A coil energizes the magnetic pole portions of the rotor. A stator fixes the magnets and the coil. A conversion unit adapted to convert rotating movements of the rotor into forward and backward movements of the lens along the optical axis. The magnets have breaks formed along the optical axis, and the guide bar is disposed in the break of the magnets.

Abstract: A stepping motor includes a hollow cylindrical fixed yoke; a magnet disposed coaxially with the fixed yoke and divided into sections in the circumferential direction, the sections being alternately magnetized; a first coil and a second coil coaxially fixed to the fixed yoke; a first rotational yoke facing a magnetized surface of the magnet and excited by the first coil; a second rotational yoke facing the magnetized surface of the magnet and excited by the second coil; and bearing units formed in bobbins for supporting a rotor including the first rotational yoke, a connecting member, and the second rotational yoke such that the rotor is rotatable with respect to the fixed yoke.