Abstract: In a high-density flexible disk drive, a color of at least a surface of a cover (22) (in addition, a color of at least a surface of an eject button (30)) is different from that of at least a surface of a body of a front panel (20). A user can visually distinguish the high-density flexible disk drive from a normal-density dedicated flexible disk drive in which a color of a surface of a cover is identical with that of a surface of a body of a front panel. Thus, a large-capacity flexible disk can be correctly inserted into the high-density flexible disk drive without being erroneously inserted into the normal-density dedicated flexible disk drive.

Abstract: A high-density flexible disk drive capable of accessing a large-capacity flexible disk is provided with a large-capacity detecting switch. The large-capacity flexible disk has a case accommodating a magnetic disk medium, with the case being provided with a write protection hole and a single large-capacity identifier hole formed in a vicinity of the write protection hole for distinguishing the large-capacity flexible disk from a small-capacity and a medium-capacity flexible disk. The large-capacity detecting switch of the high-density flexible disk drive is provided at a position corresponding to the large-capacity identifier hole for detecting the large-capacity identifier hole when the large-capacity flexible disk is inserted into the high-density flexible disk drive. In a preferred embodiment, the large-capacity detecting switch is integrally formed in a single unit with a write control switch for detecting open and close states of the write protection hole.

Abstract: A holder holds a disk, and two reversely moving members, being engaged with the holder, either lower or lift the holder as a result of being moved along reverse directions respectively. A linking member links the two reversely moving members, the linking member being rotatably supported on the holder. Each of the two reversely moving members has a guide groove inclined along a direction reverse of another direction along which a guide groove of the other one is inclined. A driving unit performs information recording/reproducing operations on a recording medium disk contained in a cartridge. A cover unit covers the driving unit for preventing dirt/dust from entering the driving unit. A shutter unit is provided at a cartridge inserting position of the cover unit, the shutter unit being opened and closed appropriately in response to cartridge insertion. The cover unit is provided in an enclosure frame of the disk device. Resilient members are provided between the cover unit and enclosure frame.

Abstract: A recording disk device comprises a sheet-like magnetic disk medium having at least one recording surface, a jacket body enclosing the magnetic disk medium and having first and second inner surfaces faced to both surfaces of the magnetic recording medium, and upper and lower liners attached to the first and the second inner surfaces of the jacket body to remove fine dust adhered to the magnetic recording medium. The recording disk device further comprises upper and lower subsidiary liners each of which is attached to at least a part of each of the upper and the lower liners so that the magnetic disk medium rotated within the jacket body is interposed between the upper and the lower subsidiary liners with both surfaces of the magnetic disk medium kept in contact with the upper and the lower subsidiary liners. The jacket body has upper and lower shells parallel to each other with the upper and the lower liners attached thereto, respectively.

Abstract: A disk cartridge includes a jacket body having upper and lower shells for receiving a magnetic disk medium therethrough. Upper and lower liners are adhered to inner surfaces of the upper and lower shells for removing fine dust attracted to upper and lower surfaces of the magnetic disk medium. In addition, upper and lower head windows are provided in the upper and lower shells, respectively, for permitting magnetic heads to access the magnetic disk medium when the magnetic disk medium is inserted through the upper and lower shells of the jacket body. A distance h.sub.1 is less than a distance h.sub.0, where h.sub.1 is the distance between said upper and said lower liners at a periphery of the upper and the lower head windows at least on an upstream side of the upper and the lower head windows with respect to a rotating direction of the magnetic disk medium, and h.sub.0 is the distance between the upper and the lower liners in a remaining area.

Abstract: In a flexible disk comprising a magnetic recording medium having an annular shape with a medium circular opening, a jacket for receiving the magnetic recording medium, and a supporting hub for supporting the magnetic recording medium, the supporting hub comprises a bottom portion and a supporting body which is integrally fixed on the bottom portion. The bottom portion is freely inserted in a jacket circular opening of the jacket. The bottom portion has a bottom diameter greater than a medium opening diameter of the medium circular opening. The supporting body has an external diameter which is substantially equal to the bottom diameter of the bottom portion. The supporting body includes a supporting rest for supporting the magnetic recording medium by adhesive bonding at an inner circumferential edge in a lower surface of the magnetic recording medium inside of the bottom portion.

Abstract: An upper magnetic head 71 is supported on an upper gimbal plate 66 about an upper pivot 63-1 to allow swing of the upper magnetic head 71. A lower magnetic head 72 is supported on a lower gimbal plate 67 about a lower pivot 64-1 to allow swing of the lower magnetic head 72. The upper pivot 63-1 is resiliently held on an upper carriage 61 with an upper pivot spring 63. The lower pivot 64-1 is resiliently held on a lower carriage 62 with a lower pivot spring 64.

Abstract: In a magnetic disk drive for driving a magnetic disk inserted thereinto, a position detection unit comprises a scale and a photointerrupter. The scale is mounted on a carriage at a side opposed to a main surface of a main frame. The scale has a plurality of slits which are equally spaced along the scale in a direction parallel to a predetermined radial direction. The photointerrupter is mounted on the main frame. The photointerrupter comprises a light-emitting section and a light-receiving section which are opposed to each other with the scale arranged therebetween. The position detection unit may comprise a magnetic scale and a magnetic sensor. The magnetic scale has a plurality of magnetic poles which extend to a in a direction parallel to with the predetermined radial direction and which are periodically reversed at regular intervals. The magnetic sensor is opposed to the magnetic scale. Preferably, the magnetic sensor may comprise of a magneto-resistive element.

Abstract: A method of writing servo data onto a high density flexible magnetic disk (7) using a servo writer is disclosed. This method comprises the steps of providing surface rippling prevention means on both sides of the magnetic disk, respectively; rotating the flexible magnetic disk at a rotation speed of 2000 rpm or higher with a spindle motor (3); and writing the servo data onto the flexible magnetic disk with magnetic heads (4). The surface rippling prevention means include soft sheet members (8a, 8b) which are arranged in close proximity to both surfaces of the flexible disk (7) in order to prevent surface rippling of the flexible disk (7) from being caused, thereby improving the accuracy of writing servo data.

Abstract: In a position detection unit having a scale and a photointerrupter and using in a magnetic disk drive, the scale has a plurality of slits which are equally spaced along a direction in parallel with a predetermined radial direction and a clipped section which is clipped out of the scale. The photointerrupter has a first light-emitting section and a first light-receiving section which are opposed to each other with the slits put therebetween. The photointerrupter has a second light-emitting section and a second light-receiving section which are opposed to each other at a position corresponding to the clipped section. The scale is mounted on a carriage at a side opposed to a main surface of a main frame. The carriage supports a magnetic head of the magnetic disk drive. And the photointerrupter is mounted on a substrate located close to the main frame.

Abstract: In a magnetic data recording/reproducing device comprising a linear motor mounted on a main plate for driving a carriage assembly having a magnetic head, the linear motor comprises a pair of coils integrally arranged with the carriage assembly on both sides thereof and a pair of magnetic circuit devices for generating magnetic fields in a direction intersecting that of electric currents flowing through the pair of coils. The linear motor further comprises a cover plate fixed to the main plate such that the pair of magnetic circuit devices are held on the main plate. The cover plate is integrally provided with a pair of urging members for urging the pair of magnetic circuit devices from upward.

Abstract: A holder holds a disk cartridge, and two reversely moving members, being engaged with the holder, either lower of lift the holder as a result of being moved along reverse directions respectively. A linking member links the two reversely moving members, the linking member being rotatably supported on the holder. Each of the two reversely moving members has a guide groove inclined along a direction reverse of another direction along which a guide groove of the other one is inclined. The disk cartridge holder is adapted to be moved in one direction by means of a cam plate movable in a second direction.

Abstract: In a high-density flexible disk drive, a color of at least a surface of a cover (22) (in addition, a color of at least a surface of an eject button (30)) is different from that of at least a surface of a body of a front panel (20). A user can visually distinguish the high-density flexible disk drive from a normal-density dedicated flexible disk drive in which a color of a surface of a cover is identical with that of a surface of a body of a front panel. Thus, a large-capacity flexible disk can be correctly inserted into the high-density flexible disk drive without being erroneously inserted into the normal-density dedicated flexible disk drive.

Abstract: In a large-capacity flexible disk having a case accommodating a magnetic disk medium, the case is provided with a single large-capacity identifier hole formed in the vicinity of a write protection hole to discriminate the large-capacity flexible disk from a small-capacity flexible disk. The large-capacity flexible disk is one of a plurality of types having storage capacities different from one another. The case is further provided with type identifier holes selectively formed to identify the type of the large-capacity flexible disk so that the type of the large-capacity flexible disk can be identified with reference to the number and the position of the type identifier holes. A high-density type flexible disk drive, moreover, is provided with a large-capacity detecting switch at a position corresponding to the large-capacity identifier hole.

Abstract: A magnetic disk drive comprises a disk holder (10) for holding a magnetic disk, a carriage with a magnetic head mounted thereon, a linear motor for moving the carriage, a lock lever (52) for locking the carriage in cooperation with an ejecting operation of the magnetic disk held in the disk holder, and an eject lever (51) for ejecting the magnetic disk from the disk holder. The lock lever and the eject lever are integrally formed as a single unit. The magnetic disk drive further comprises a lock lever locking mechanism (60) for locking the lock lever in a locking state where the lock lever is locking the carriage.

Abstract: A holder holds a disk, and two reversely moving members, being engaged with the holder, either lower or lift the holder as a result of being moved along reverse directions respectively. A linking member links the two reversely moving members, the linking member being rotatably supported on the holder. Each of the two reversely moving members has a guide groove inclined along a direction reverse of another direction along which a guide groove of the other one is inclined. A driving unit performs information recording/reproducing operations on a recording medium disk contained in a cartridge. A cover unit covers the driving unit for preventing dirt/dust from entering the driving unit. A shutter unit is provided at a cartridge inserting position of the cover unit, the shutter unit being opened and closed appropriately in response to cartridge insertion. The cover unit is provided in an enclosure frame of the disk device. Resilient members are provided between the cover unit and enclosure frame.

Abstract: In a servo writer for writing servo data on a magnetic disk medium of a large-capacity flexible disk using a magnetic head, the servo writer includes a direct-acting head carriage for supporting the magnetic head. The direct-acting head carriage is used in a high-density type flexible disk drive for carrying out data recoding and reproducing operations to and from the magnetic disk medium of the large-capacity flexible disk. A connection rod integrates the direct-acting head carriage with an actuator of the servo writer.

Abstract: A high-density flexible disk drive includes a main electromagnetic shielding plate and an auxiliary electromagnetic shielding plate. The main electromagnetic shielding plate serves as a cover member for the disk drive, and protects the whole upper surface of a large-capacity flexible disk received in the disk drive, a carriage and a linear motor from electromagnetic noise coming toward the flexible disk, the carriage and the linear motor from the upper side of the disk drive. The auxiliary electromagnetic shielding is attached to the main electromagnetic shielding plate and is smaller than the main electromagnetic shielding plate. The auxiliary electromagnetic shielding plate is arranged and located so as to protect or shield a magnetic head from electromagnetic noise coming toward the magnetic head from the upper side of the disk drive.

Abstract: A flexible disk drive includes a magnetic head carriage, a linear motor for moving the carriage, and a carriage locking mechanism for locking the carriage in response to ejecting action of a flexible disk from the flexible disk drive. A lever unit has an ejecting lever and a locking lever. The ejecting lever is a part of an ejecting mechanism for ejecting the flexible disk from the flexible disk drive. The locking lever is disposed in the vicinity of the carriage, and locks the carriage from movement after the flexible disk is ejected from the flexible disk drive by the ejecting lever. The lever unit is made of non-magnetic material such as resin as one body.

Abstract: In a magnetic data recording/reproducing device comprising a voice coil motor for use in driving a carriage assembly having a magnetic head for recording and reproducing data on and from a disk-shaped magnetic recording medium, the voice coil motor comprises a pair of voice coils integrally arranged with the carriage assembly on both sides thereof and a pair of magnetic circuit devices for use in generating magnetic fields which intersect over electric currents flowing through the pair of voice coils. Each of the magnetic circuit devices comprises a center yoke passing through the voice coil and a back yoke having a main surface extending in parallel with the center yoke at a certain distance and being opposed to the center yoke. The back yoke has bent portions each of which is bent at a generally right angle. The bent portions are magnetically connected to the corresponding ends of the center yoke. A permanent magnet is fixed to the main surface of the back yoke.