Abstract:
A rotor magnet includes a first polarized layer alternately polarized into different poles while being circumferentially divided into n parts, and a second polarized layer alternately polarized into different poles. An advance phase angle as &thgr;1 with respect to the first polarized layer is set and the magnet is circumferentially divided into n parts. First and second coils are disposed in an axial direction of the rotor magnet. A first outer magnetic pole and a first inner magnetic pole, which are a first stator excited by the first coil, are opposed to an outer peripheral surface and an inner peripheral surface of the rotor, and a second outer magnetic pole, and a second inner magnetic pole which are a second stator excited by the second coil, are opposed to an outer peripheral surface and an inner peripheral surface of the rotor. When a lag phase angle of the second stator with respect to the first stator is set to &thgr;2, the first and second polarized layers and the first and second stators are positioned so that &thgr;1+&thgr;2 are larger than 180/n degrees. As a result, the power output of the motor is enhanced.
Abstract:
A camera includes a magnetic head for performing writing and/or reading of information on film. The magnetic head is movable between a position proximate the film (e.g., pressed to it) for performing a read/write operation and a position remote or withdrawn from the film. The camera further includes an operating member movable between a first position and a second position, such as a lens cover movable between a position covering the lens and a position uncovering the lens, and means for synchronizing, e.g., by mechanically interconnecting, movement of the magnetic head between the first and second position, and movement of the operating member between the first and second positions.
Abstract:
A motor of an increased output is provided by forming a rotor, composed of a permanent magnet circumferentially divided into equal sections and alternately magnetized in different magnetic poles, in a cylindrical shape, positioning a first coil, the rotor and a second coil along the axial direction of the rotor, providing a first outer magnetic pole and a first inner magnetic pole, magnetized by the first coil, in opposed relationship, respectively, to the external and internal peripheries of the rotor, also providing a second outer magnetic pole and a second inner magnetic pole, magnetized by the second coil, in opposed relationship respectively to the external and internal peripheries of the rotor and positioning the first outer magnetic pole and the second outer magnetic pole in an axially opposed relationship with a mutual displacement by a predetermined phase angle, or forming the ends of the first and second outer magnetic poles in a tapered shape, thereby decreasing the leaking magnetic flux.
Abstract:
A motor includes a rotor having a permanent magnet circumferentially equally divided and alternately magnetized to different poles formed into a cylindrical shape, and a first coil. The rotor and a second coil may be successively disposed axially of the rotor. A first outer magnetic pole and a first inner magnetic pole excited by the first coil may be opposed to the outer peripheral surface and the inner peripheral surface of the rotor, and a second outer magnetic pole and a second inner magnetic pole excited by the second coil may be opposed to the outer peripheral surface and the inner peripheral surface of the rotor. The rotor has an output transmitter, such as a gear or a pulley, mounted on the outer peripheral surface of the central portion thereof.
Abstract:
A camera or an apparatus adapted for a camera includes an operation unit for performing at least one of write and read operations of information with respect to an image recording medium, and an interlocking unit, interlocked with movement of an optical unit, for preventing the operation unit and the image recording medium from contacting each other at least while an image is being recorded in the image recording medium.
Abstract:
A shutter device for a camera includes shutter blades arranged to be movable to a first position in which the shutter closes and to a second position in which the shutter opens, and a switching part arranged to change a clearance provided between the shutter blades along an optical axis from a first state over to a second state in which the clearance is narrower than in the first state.
Abstract:
A data imprinting device provided with an input lock switch for disabling the input of imprinting data by data input switches, and a discriminating circuit for disabling the data input when the input lock switch is ON and only when all the data input switches are ON.
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 is capable of increasing a driving speed at which an object to be driven is driven, enhancing quietness in driving the object to be driven, and positioning the object to be driven with high accuracy. A hollow cylindrical magnet (1) extends along an optical axis, and a plurality of magnetized parts (1a to 1j) spirally extend along the outer peripheral surface of the magnet. A first yoke (2), a second yoke (3), a third yoke (7), and a fourth yoke (8) are formed of a soft magnetic material, and each of the yokes has five magnetic pole teeth (2a to 2e, 3a to 3e, 7a to 7e, or 8a to 8e) each disposed in opposed relation to a corresponding one of the magnetized parts of the magnet. A lens holder (12) holds the object to be driven and supports the magnet such that the magnet is movable along the optical axis. First and second coils (5, 10) for magnetizing the first and second yokes, respectively, are energized to move the magnet along the lens holder in the direction along the predetermined axis to thereby drive the object to be driven.
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.