Abstract: A head carriage device includes a carriage, a head arm, a flat spring extending from the head arm, a fixing member to fix the flat spring to the carriage, a resilient member to resiliently urge the head arm in a direction in which the head arm moves toward the carriage, a lifting mechanism to pivot the head arm away from and toward the carriage, and a finger to which the lifting mechanism is applied, the finger being provided at one side of the head arm. The head carriage device is provided with a first protrusion and a second protrusion. When the head arm is pivoted away from the carriage, a restricting finger restricts the movement of a free end of the first protrusion away from the carriage, and a restricting face provided on the carriage restricts the movement of a free end of the second protrusion toward the carriage.

Abstract: A motor having a rotor with a plurality of magnetic poles arranged in an arch or circular shape and a stator in which coils are disposed on the magnetic teeth of a stator core having a plurality of the magnetic teeth disposed opposite to the rotor, wherein a magnetic pole part for cancelling a cogging torque is disposed around the rotor.

Abstract: A chucking device for a magnetic disk that includes a substantially disk-shaped bearing and a drive arm extending in a rear side of a rotor yoke along a circumferential direction and loosely suspended from and held by a rotor yoke on both ends. An inner peripheral surface for restraining movement toward a bearing is formed at the drive arm, and a drive pin loosely passing through a drive pin through hole of the rotor yoke to extend upward and loosely inserted into a drive hole of a magnetic disk is formed at a front part of the drive arm in a rotor yoke rotation direction. When the rotor yoke having the magnetic disk placed thereon is rotated, the inner peripheral surface of the drive arm comes away from the bearing, and the drive pin comes in contact with a front edge and an outside edge of the drive hole.

Abstract: A base of an arm having a driving projection at its tip is rotatably supported on a turn table. The turn table is provided with a first guide part and a second guide part, an outer edge part of the base of the arm and a first guide part are in contact with each other at a contact point, and a projection and a second guide part are in contact with each other at a contact point. While the arm rotates in a counterclockwise direction, the contact points are moved, and it is possible to prevent the center of the driving projection from largely deviating from a reference normal. Thus, even if a hub in which the position of the driving hole is shifted is mounted, the hub is not largely shifted in a rotation direction relative to a turn table.

Abstract: A magnetic disk drive includes a body having a chassis formed of a flat plate, and at least a spindle motor and a head carriage that are mounted to the chassis. A bottom cover is mounted to cover the chassis, and a holding mechanism (such as a screw) to hold the chassis and the bottom cover. The holding mechanism is disposed on a support line which extends perpendicular to a line passing through the center of gravity of the body extending in a direction of movement of the head carriage and which is displaced from the center of gravity of the body. The body is rotatable with respect to the bottom cover, with the support line as an axis.

Abstract: An inner rotor motor includes a rotor which has a plurality of circumferentially arranged magnetic poles and a stator which is positioned outside a circumference of the rotor and has a stator core which includes a plurality of magnetic pole teeth which face the rotor in an opposed manner and arranges coils for respective magnetic pole teeth. In such a constitution, the stator is arranged within a center angle of 180° with respect to a center of rotation of the rotor. Further, pitches of the magnetic pole teeth in the rotor circumferential direction along which respective rotor facing surfaces of the magnetic pole teeth are arranged are set smaller than pitches of the rotor in the rotor circumferential direction along which the magnetic poles of the rotor are arranged.

Abstract: There are provided a rotor having plural magnetic poles disposed in a circumferential shape, and a stator including a stator core having plural magnetic pole teeth that are outside a circumference of the rotor and face the rotor, a coil being wound around each of the magnetic pole teeth, wherein the stator is provided in a range within 180 degrees with respect to a center of the rotor, the magnetic pole teeth are set so that the value of at least one of angles each formed by extensions of adjacent magnetic pole teeth is smaller than an angle formed by lines each connecting a tip center of one of adjacent magnetic pole teeth and a rotation center of the rotor.

Abstract: The inner-rotor motor of the invention includes a rotor having plural magnetic poles disposed circumferentially, and a stator having a stator core with plural magnetic pole teeth facing to the rotor, located outside a circumference of the rotor, which have coils each wound around thereof. In this construction, the stator is placed within a central angel 180° with regard to a rotational center of the rotor, and the coils are set such that the numbers of turns of adjacent coils are unequal, and respective sums of the numbers of turns of the coils in respective phases are equal.

Abstract: An inner rotor motor includes a rotor having a plurality of magnetic poles circumferentially arranged, and a stator with a stator core having a plurality of magnetic pole teeth that are positioned on the outer side of the circumference of the rotor and oppose the rotor. A coil is provided on each of the magnetic pole teeth. The stator extends not more than 180 degrees with respect to the center of the rotor.

Abstract: Disclosed is a disk device in which slide pieces slidable along an edge portion of a slide hole formed in a chassis are formed at the central part of both ends of a holder. The forward end of either of the slide pieces has a straight surface formed on the edge portion 2a side; and an inclined portion is formed by obliquely cutting the surface of the edge portion 2b side. When the disk case M inserted reaches a predetermined position, the holder slides within the slide hole of the chassis. In this case, the holder lowers while the inclined portion of the slide piece slides along the edge portion, enabling a decrease in the lowering speed of the holder to thereby reduce the lowering speed of the head descending into contact with the disk D.

Abstract: A magnetic disk drive having an elastic member on any one of a cartridge holder and a slide plate, and engaging portions on the other one, in order that the elastic member engaged with the engaging portions will produce a resistance force against the force of coil springs when the slide plate is slid by the force of the coil springs.

Abstract: A vibration device with a simple structure, in which a yoke and a coil are combined, is incorporated in a game machine control device, and caused to vibrate in response to displays on the screen of a game machine. This structure allows vibrations to be transmitted to a player who is gripping the control device, and therefore, the player can be given the effect of the sense of touch in compliance with the displays.

Abstract: In a stepping motor control method having an object for correctly and relatively simply determining the position of a pseudo-track center in the dead zone of a stepping motor, a forwardly and reversely rotatable stepping motor is rotated by that a plurality of the excitation phases thereof are sequentially driven by a driving pulse, a head is moved to a predetermined track position of a disc-shaped recording medium, a predetermined one of the excitation phases of the stepping motor is additionally driven by being intermittently supplied with a driving current for a minute period of time when the head moves to the predetermined track position and enters the dead zone of the stepping motor and the head is stopped at an end of the dead zone of the stepping motor.