| Patent application number | Description | Published |
|---|
| 20080203961 | MOTOR DRIVING APPARATUS - 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. | 08-28-2008 |
| 20090072677 | MOTOR DRIVING APPARATUS - 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. | 03-19-2009 |
| 20090175611 | FOCUS CONTROLLER, OPTICAL APPARATUS USING THE SAME, AND CONTROL METHOD - 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. | 07-09-2009 |
| 20090189990 | OPTICAL APPARATUS - 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. | 07-30-2009 |
| 20090190910 | FOCUS CONTROLLER AND OPTICAL APPARATUS USING THE SAME - 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. | 07-30-2009 |
| 20090200972 | BRUSHLESS DC MOTOR AND IMAGE PICKUP APPARATUS - 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. | 08-13-2009 |
| 20090219636 | LENS BARREL DRIVE APPARATUS - 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. | 09-03-2009 |
| 20100097020 | DRIVE APPARATUS - 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. | 04-22-2010 |
| 20100209097 | INTERCHANGEABLE LENS AND CAMERA SYSTEM - An interchangeable lens which is removably mounted on a camera body including an image sensor includes a tilt unit configured to move a lens unit in a tilt direction with respect to the image sensor, a shift unit configured to move the lens unit in a shift direction with respect to the image sensor, a changing unit configured to change a relative angle between the shift unit and the tilt unit by relatively rotating the shift unit and the tilt unit, a detection unit configured to detect the relative angle, and a control unit configured to transmit to the camera body a detection result of the relative angle detected by the detection unit. | 08-19-2010 |
| 20100253253 | MOTOR DRIVING APPARATUS - 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. | 10-07-2010 |
