Abstract: A carriage for a magnetic disk apparatus includes a slider on which a magnetic head for reading/writing information from/to a disk is mounted, a suspension for carrying the slider and for applying a predetermined load to the slider, and a carriage arm to which the suspension is attached. The carriage arm includes a suspension fixing portion, first and second arms arranged substantially in parallel with a disk surface, and a restricting member having a surface opposite to the first and second arms. The restricting member and the first arm, and the restricting member and the second arm are coupled via a viscoelastic body.

Abstract: A carriage arm assembly for swingably supporting a magnetic head which includes a slider, a suspension carrying the slider, a carriage arm to which the suspension is attached, and a body section. The carriage arm extends from the body section and includes first and second arm members extending substantially in parallel with a swinging plane of the carriage arm, and a fixing portion provided at a distal end of the carriage arm for mounting the suspension thereon. Each of the first and second arm members have narrow sections in a distal end area and a base end area thereof, wherein a width of the narrow sections in a swinging direction is smaller than a width of an intermediate area of the first and second arm members.

Abstract: A magnetic disk drive having a high recording density and enabling high speed transfer is achieved by reducing vibration of a carriage arm assembly to reduce a positioning error. The disk drive is configured so that a carriage arm is configured by two arm portions, the arm portions being coupled to each other by a restraint member through a viscoelastic material, the restraint member being supported on a carriage body or an area of the carriage arm in the vicinity of the body by means of adhesion or a viscoelastic material. By providing a high damping effect against various vibration modes in which in-plane bending and out-plane bending of the carriage arm are generated, vibration of the carriage arm assembly is suppressed, so that the positioning error is reduced, thereby the magnetic disk drive having a high recording density can be achieved.

Abstract: A magnetic disk drive comprises at least one magnetic head for reading and writing information on at least one magnetic disk, a carriage supporting the magnetic head over the magnetic disk for movement of the magnetic head about a predetermined shaft, an annular coil supported by a bobbin provided on the carriage and subjected to an electromagnetic force for driving the carriage. The drive further comprises a first connection member for joining the annular coil and the bobbin, an in-coil member arranged inside the annular coil, and a second connection member for joining the in-coil member and the annular coil. A modulus of longitudinal elasticity of the in-coil member is larger than that of the first or second connection member. The drive thus formed has the increased carriage rigidity, the improved positioning accuracy of a magnetic head and the increased recording capacity of the disk.

Abstract: A magnetic disk drive is to be provided wherein oscillations in thrust, conical and translational modes of a spindle caused by disturbance are to be damped to diminish a positioning error and thereby attain a high recording density and improved accessing performance. In one embodiment, there is provided a compensation circuit using acceleration or angular acceleration sensors, the sensors being disposed on a base, a cover or a PCB (printed circuit board) of a magnetic disk drive so that they can detect disturbance effectively, and wherein a mechanical system transfer characteristic of and other parameters in thrust, conical, or translational mode of a spindle are acquired or calculated by a processor and unnecessary oscillation in each mode is compensated. In another embodiment, to measure a transfer characteristic of the spindle in thrust mode and other parameters after installation of the magnetic disk drive in a case, piezoelectric elements are provided as one of oscillating means.

Abstract: A carriage arm assembly for swingably supporting a magnetic head which includes a slider, a suspension carrying the slider, a carriage arm to which the suspension is attached, and a body section. The body section includes first and second arm members extending substantially in parallel with a swinging plane of the carriage arm, and a fixing portion provided at a distal end of the carriage arm for mounting the suspension thereon. Each of the first and second arm members have narrow sections in a distal end area and a base end area thereof, wherein a width of the narrow sections in a swinging direction is smaller than a width of an intermediate area of the first and second arm members.

Abstract: According to the invention, there is provided a carriage arm assembly including a carriage arm having two arm members. The arm member is constructed in such a way that the width of its coil side end and the width of its suspension side end are narrower than that of its intermediate area. This construction widens a servo band width, improves positioning accuracy, and reduces positioning errors of a magnetic disk apparatus, so that recording density is improved and storage capacity is increased. Further, by coupling two arm members using a restriction member via a visco-elastic member, it is possible to achieve a high damping effect on various vibration modes including in-plane bending of the arms, and suppress vibration of the carriage so as to reduce the positioning errors.

Abstract: A magnetic disk apparatus includes a magnetic disk, a magnetic head for writing data into and reading data from the magnetic disk, a carriage pivoted on a pivot bearing while holding the magnetic head at its one end, the pivot bearing being constituted by a cylindrical sleeve serving as a fixed axle, bearing units each having an outer race fitted to the inside of the sleeve, bearing balls, and an inner race, and a shaft having the outside fitted to the inner races of the bearing units, thus, change of a pre-load caused by a heat expansion difference between the shaft and sleeve is an axial direction is compensated with a change of a pre-load caused thereby the same is a radius direction. Hence, the weight of a pivotally movable portion of an actuator is reduced.

Abstract: A magnetic disk drive having a high recording density and enabling high speed transfer is achieved by reducing vibration of a carriage arm assembly to reduce a positioning error. The disk drive is configured so that a carriage arm is configured by two arm portions, the arm portions being coupled to each other by a restraint member through a viscoelastic material, the restraint member being supported on a carriage body or an area of the carriage arm in the vicinity of the body by means of adhesion or a viscoelastic material. By providing a high damping effect against various vibration modes in which in-plane bending and out-plane bending of the carriage arm are generated, vibration of the carriage arm assembly is suppressed, so that the positioning error is reduced, thereby the magnetic disk drive having a high recording density can be achieved.

Abstract: According to the invention, there is provided a carriage arm assembly including a carriage arm having two arm members. The arm member is constructed in such a way that the width of its coil side end and the width of its suspension side end are narrower than that of its intermediate area. This construction widens a servo band width, improves positioning accuracy, and reduces positioning errors of a magnetic disk apparatus, so that recording density is improved and storage capacity is increased. Further, by coupling two arm members using a restriction member via a visco-elastic member, it is possible to achieve a high damping effect on various vibration modes including in-plane bending of the arms, and suppress vibration of the carriage so as to reduce the positioning errors.

Abstract: A magnetic disk drive comprises at least one magnetic head for reading and writing information on at least one magnetic disk, a carriage supporting the magnetic head over the magnetic disk for movement of the magnetic head about a predetermined shaft, an annular coil supported by a bobbin provided on the carriage and subjected to an electromagnetic force for driving the carriage. The drive further comprises a first connection member for joining the annular coil and the bobbin, an in-coil member arranged inside the annular coil, and a second connection member for joining the in-coil member and the annular coil. A modulus of longitudinal elasticity of the in-coil member is larger than that of the first or second connection member. The drive thus formed has the increased carriage rigidity, the improved positioning accuracy of a magnetic head and the increased recording capacity of the disk.

Abstract: In magnetic disk structures having a high density, positioning errors (generally referred to as “flutter error”) occur due to a fluctuation of a magnetic disk. As a result, reading precision deteriorates. This is a significant problem in realizing a large capacity for a magnetic disk apparatus. This can be resolved by providing a magnetic apparatus such that a suspension which holds a slider having a magnetic head at one end and which is attached to a supporting arm at the other end is inclined so that an interval between the suspension and the magnetic disk is small on the inner rim side and is large on the outer rim side with this arrangement, the occurrence of the positioning error due to the fluctuation of a deformation of the magnetic disk is reduced, thereby enabling a high density recording of the magnetic disk.

Abstract: A magnetic head slider having a recording-reproducing element for recording and reproducing information relative to a magnetic recording medium. A sliding protective film is formed at one outer side or each of opposite outer sides of that portion, constituting the recording-reproducing element, in a direction perpendicular to a travel surface of the magnetic head slider opposed to the magnetic recording medium, at least part of the sliding protective film covers that portion reaching the travel surface, and the sliding protective film is also formed on each of side surfaces of the slider.

Abstract: In a magnetic head slider having a recording-reproducing element for recording and reproducing information relative to a magnetic recording medium, a sliding protective film is formed at a front side or a rear side of the recording-reproducing element, in a direction perpendicular to a sliding surface of the recording-reproducing element, and by doing so, there can be achieved the magnetic head slider capable of high-density recording and reproduction, and also the cost of production of the magnetic head slider can be reduced.

Abstract: A magnetic recording device including a magnetic head for reading and/or writing with a magnetic recording medium which moves, a slider for holding the magnetic head on the magnetic recording medium, an actuator for moving the magnetic head, an arm, connected to the actuator, for supporting the slider, and a slider rotary support portion for attaching the slider to the support arm. The slider rotary support portion is provided with a first deformable portion, a first rigid portion, a second deformable portion and a second rigid portion which are arranged in order from the support arm. The slider is mounted on the second rigid portion with the first deformable portion and the second deformable portion being elastically deformed by a frictional force exerted on the slider during movement of the slider on the recording medium.

Abstract: A rotating disk type information storage apparatus includes a rotating disk for storing information, a head for writing/reading the information, a support member for supporting the head, a first actuator for moving the support member to a predetermined position on the rotating disk, and a second actuator including a movable member supported by the support member and capable of being rotated about an axis perpendicular to a recording surface of the rotating disk, and a driving force generating member for rotating the movable member. The movable member is integrated with the support member and has the head mounted thereto, in which a center of gravity of the movable member including the mounted members generally coincides with the center of rotation of the movable member. The second actuator corrects an error in a positioning of the support member and positions the head, and the movable member is not vibrated during the positioning.

Abstract: In magnetic disk structure having a high density, positioning errors (generally referred to as "flutter error") occur due to fluctuation (i.e., flutter) of a magnetic disk. As a result reading precision deteriorates. This is a significant problem in realizing a large capacity providing magnetic disk apparatus. This can be resolved by magnetic apparatus such that a suspension which holds a slider having a magnetic head at one end and which is attached to a supporting arm at the other end is inclined so that an interval between the suspension and the magnetic disk is small on the inner rim side and is large on the outer rim side with this arrangement the occurrence of the positioning error due to the fluctuation of a deformation of the magnetic disk is reduced, thereby enabling a high density recording of the magnetic disk.

Abstract: When a slider slides on a recording medium and a frictional force acts on the slider, an unstable vibration resulting from falling forward of the slider and a local stress are prevented from being generated. An attitude of the slider is stabilized, and the slider is kept in a steady contact with a disc. A rotary support mechanism is constituted by successively connecting one deformable portion, one rigid portion and another deformable portion to an upstream side of another rigid portion with a slider attached thereto in a recording medium movement direction. The another deformable portion is bonded to a support arm. While a predetermined pressing load is given to the slider by a spring portion, an intersection of an extension of a virtual line connecting the one and another deformable portions with the surface of the recording medium is positioned on the upstream side of a sliding point of the slider on the recording medium in the recording medium movement direction.

Abstract: There is provided a magnetic tape device capable of highly accurate positioning at a high speed. For this purpose, the head is driven in the direction of the width of the tape by eliminating the friction between the tape the head. In order to allow positioning in the direction of the width of the tape, even if a servo signal cannot be read from a servo track, the absolute position of the head from a reference position is detected, and the head is controlled based on the absolute position.