Abstract: A driving section of a head actuator mechanism rotatably supporting a magnetic disk includes a voice coil, and a piezo-electric element for cutting off a resonance resulting from a drive of the voice coil. The driving section is arranged on a side opposite to an arm across a rotational axis of the head actuator mechanism. The voice coil and the piezo-electric element are held by a holding frame which is molded of a resin integrally with these voice coil and piezo-electric element.

Abstract: A head driving device of a disk recording/reproducing device, which has a plurality of heads mounted thereon to record/reproduce data in and from a disk for positioning the plurality of heads in target positions by moving these in a radial direction of the disk, comprises a plurality of suspension members for respectively supporting the plurality of heads, a head arm member having a plurality of support arms for supporting the plurality of suspension members for transmitting rotary driving forces for moving the plurality of heads, main driving section for moving the plurality of heads by rotary-driving the head arm member, and sub-driving section for integrally driving the plurality of support arms in a fine manner and fine-adjusting movements of the plurality of heads moved by the main driving section.

Abstract: A magnetic head drive of the present invention comprises a composite magnetic head structured by integrally combining a write head into a record head and a magnetic disk having a servo area where position information of the composite magnetic head is recorded and a data area where data is recorded, and the servo area includes a positioning data area having head positioning information, and the head has an erased area generated by recording an AC signal having a frequency higher than a burst pattern in an area other than the burst pattern including information of positioning the composite magnetic head of said positioning data area.

Abstract: A magnetic multi-head unit includes: a specific magnetic head formed so that a pair of magnetic yokes face each other on the same plane via a magnetic gap inclined by a predetermined azimuth angle; and a magnetic head which is adjacent to the specific magnetic head and which is formed so that a pair of magnetic yokes face each other on a plane different from the plane of the specific magnetic head via a magnetic gap inclined by the azimuth angle. The specific magnetic head and the adjacent magnetic head are laminated so as to form a plurality of layers while being shifted from each other in directions in which tracks on a magnetic disk extend.

Abstract: A magnetic head drive including a composite magnetic head structured by integrally combining a write head into a record head and a magnetic disk having a servo area where position information of the composite magnetic head is recorded and a data area where data is recorded. The servo area includes a positioning data area having head positioning information, and the head has an erased area generated by recording an AC signal having a frequency higher than a burst pattern in an area other than the burst pattern including information of positioning the composite magnetic head of said positioning data area.

Abstract: A recording/reproducing apparatus according to the invention comprises a recording medium, a recording/reproducing head for reading and writing information on and from the recording medium, a suspension section attached to the recording/reproducing head, an arm attached to the suspension, first driving means provided between the recording/reproducing head and the suspension section for finely displacing the recording/reproducing head to the suspension, and second driving means for driving the arm to move the recording/reproducing head to a predetermined position on the recording medium.

Abstract: A magnetic disk apparatus is disclosed wherein the apparatus comprises a magnetic disk, magnetic heads for recording and reproducing information to and from the magnetic disk, a disk driving device for driving the magnetic disk, head driving device for driving the magnetic heads, a mechanical portion driving circuit for operating the disk driving device and the head driving device, a logical operation device for exchanging signals between the magnetic heads and the mechanical portion driving circuit, a first box for containing at least the magnetic disk, the magnetic heads, the disk driving device, and the head driving device, and a second box, detachably connected to the first box, for containing at least the logical operation device, wherein signals are exchanged between the first box and the second box. The first box and the second box are electrically connected and the second box contains at least the logical operation circuit.

Abstract: A magnetic disk drive with a magnetic head rotationally actuated is provided with a magnetic head for reading and/or writing information to a recording disk, an arm portion made of resin for carrying the magnetic head on one end thereof, and a driver for rotating the arm portion by a driving force. The diameter of the recording disk is equal to or less than 2.5 inches. The magnetic head carried on the arm portion is moved in the radial direction of the recording disk. Information stored in the recording disk is read by the magnetic head, and information is written in the recording disk.

Abstract: A magnetic disk apparatus is disclosed wherein the apparatus comprises a magnetic disk, magnetic heads for recording and reproducing information to and from the magnetic disk, a disk driving device for driving the magnetic disk, head driving device for driving the magnetic heads, a mechanical portion driving circuit for operating the disk driving device and the head driving device, a logical operation device for exchanging signals between the magnetic heads and the mechanical portion driving circuit, a first box for containing at least the magnetic disk, the magnetic heads, the disk driving device, and the head driving device, and a second box, detachably connected to the first box, for containing at least the logical operation device, wherein signals are exchanged between the first box and the second box. The first box and the second box are electrically connected and the second box contains at least the logical operation circuit.

Abstract: A magnetic disk drive for reading information stored in a recording disk and/or writing information to the recording disk comprises a magnetic head for reading and/or writing information to the recording disk, an arm portion for carrying the magnetic head on one end thereof, an elastic portion for elastically supporting another end of the arm portion, the arm portion being rotatably supported, a fixed portion for holding the arm through the elastic portion, and a driver for rotating the arm portion by a driving force, the magnetic head carried on the arm portion being moved in the radial direction of the recording disk.

Abstract: A magnetic head supporting mechanism capable of providing a satisfactory state of contact between the magnetic heads and the magnetic disk, while maintaining individual parts in good condition. The mechanism includes a gimbal for supporting each magnetic head on the carriage, including a head fixing portion on which one of the magnetic head is mounted; double thin plates surrounding the head fixing portion; a carriage fixing portion attached to the carriage; and a plurality of bridge connections connecting the head fixing portion, the double thin plates, and the carriage fixing portion together, such that the spring constant in a direction around the rolling axis is larger than the spring constant in a direction around the pitching axis. The mechanism may also include a gimbal including at least one portion of octagonal shape.

Abstract: The present invention provides a nutation damper having a hollow ring-shaped container installed concentrically to the axis of spin of a spinning body, with a viscous fluid sealed inside, and partially filling the container so as to leave a gap. The volume of the viscous fluid is determined as less than or equal to 1/2 of the volume enclosed by the outer wall of the container. It can provide a nutation damper of simple construction which can damp nutation arising in high-speed spinning bodies and allow these spinning bodies to spin stably.

Abstract: A magnetic disc device for recording and reproducing data on a magnetic disc comprising a magnetic head for contacting the disc and for reading and writing data on the disc. A spindle for rotatably supporting the disc for contact with the head are provided. Further, the present invention includes a gimbal plate flexibly supporting the head for compensating for variations in the thickness of the disc and variations the surface level of the disc. The gimbal plate includes links for varying the elasticity of the gimbal plate between at least two directions. There are at least four links located in one direction for reducing stress on the gimbal plate and increasing the allowable degree of variation in elasticity between the two directions.

Abstract: A linear actuator comprises a pair of central poles symmetrically arranged parallel to the direction of motion of a carriage for transducers. Four permanent magnets are disposed around each central pole leaving predetermined gaps. Four ambient poles and one terminal pole surround the permanent magnets and each central pole. Two driving coils are slidably movable in the predetermined gaps therebetween. Upper and lower flat plate members support the driving coils so they may be fixed to the carriage. The central poles each have a rectangular cross-section, the permanent magnets surrounding the exterior four walls of the central poles leaving the predetermined gaps in which the driving coils are disposed. The ambient poles and terminal poles surround the central poles and form closed magnetic circuits. The flat plate members of the carriage are composed of ceramic material. The driving coils, arranged inside the predetermined gaps, are mounted at the ends of the flat plate members.

Abstract: Leaf spring is fixed at one end thereto to a carriage, and extended at a predetermined angle to the carriage. A part of the leaf spring has rigidity. A gimbal spring, which free from the carriage, is mounted on the rigid portion. Head is fixed to the gimbal spring. The head can move perpendicularly to the carriage by the operation of the leaf spring, and can roll and pitch by the operation of the gimbal spring. Thus, the head can follow to move elevationally upward and downward and incline to the disk-like recording medium and contact the medium with good contacting property.

Abstract: A head access mechanism of the magnetic disk memory device for memorizing information by means of a rigid or flexible magnetic disk. The head access mechanism is equipped with a moving-coil type linear motor comprising an E-shaped yokes with two magnetic gaps and a movable coil. The yokes are arranged so as to produce the two magnetic gaps side by side on the extension itself of the plane of placement of the magnetic disk and/or plane parallel to it, with their openings opposing the magnetic disk. Magnets are installed on each of the magnetic gaps to align the magnetic flux toward the central yoke of the yokes. A movable coil is wound through the two magnetic gaps encircling repeatedly around the central yoke on which an indentation is provided, which extends parallel to the magnetic gaps.

Abstract: A head positioning mechanism in accordance with the present invention is equipped with a motor with a rotation axis, a pulley which is fixed to the rotation axis, a carriage member which holds the magnetic read/write heads and is guided towards and away from a disk, a flexible band which is wound around the pulley, two attachments which attach the respective ends of the band to spaced apart positions an the carriage member. The two attachments have respective elastic elements to give separately predetermined tension to the band, and at the same time, at least one of the attachments has a damping element which damps the vibration.