Mitsumi Electric Company Ltd.

Yoshinori Tangi

Yoshihiro Okano

Tsuneo Uwabo

Eiichi Yoneyama

Kazuya Tamura

Yoshihide Majima

Toshimitsu Itoh

Hiromi Inoguchi

Toshiharu Shimizu

Teruo Shimazu

In the engaging structure of a lead screw () with a head lift body (), for simplification of a feeding side mechanism and improvement of feeding accuracy, the head lift body has only one fingernail shaped protrusion () as a member engaging with an external thread of the lead screw (). The protrusion () is provided on an internal wall surface of a bearing portion () formed in an integral structure with the head lift body (). Accordingly, the engagement of the external thread of the lead screw and the single protrusion converts the rotation movement of the lead screw () to the linear movement of the head lift body (). As a result, a feeding accuracy in the linear movement converted from the rotation movement is only determined by a feeding accuracy of only the lead screw (). In an example, the protrusion is a half-moon shaped plate.

Head feeding mechanism having protrusion engaged with lead screw

In a reel hub releasing mechanism, a seesaw type release lever is arranged so as to be turnable with its central part as a fulcrum, and it includes first and second flat members extending onto both sides from the fulcrum. The first flat member has an engaging protrusion at its distal end, while the second flat member has at its distal end a lever manipulating protrusion which protrudes upwards in order to manipulate a lock lever. A tape cartridge is formed with a window for snugly inserting the lever manipulating protrusion. When the lever manipulating protrusion abuts against the lock lever through the window, the operation of releasing reel hub lock is effected, and the tape cartridge is positioned so that the position of the window in the direction of inserting the tape cartridge into the slot of a tape drive may become substantially equal to the position of the lever manipulating protrusion in the inserting direction. It is accordingly possible to provide that reel hub lock mechanism of the tape drive which can position the tape cartridge simultaneously with the release of the reel hub lock, without separately forming any positioning part, and the tape drive which comprises the reel hub lock mechanism.

Reel hub lock releasing mechanism

A magnetic disk includes a disk-like magnetic data recording medium in which data are allowed to be read and written; and a disk case which rotatably incorporates the magnetic data recording medium , liners are bonded to faces of the case which are opposed to a magnetic data recording plane of the magnetic data recording medium , respectively. The liners attract dust by means of an electrostatic attractive force while supporting front and back sides of the magnetic data recording plane

Magnetic disk

A movable member is moved back or forth by a motor A carriage opening/closing member which vertically guides a pair of projections opposingly formed on opposed faces is disposed between upper and lower carriages and which are elastically supported on the movable member and vertically opposed to each other. Reading/writing heads which are opposingly disposed on the opposed faces of the upper and lower carriages and are separated from magnetic data recording surfaces of a magnetic data recording medium When the carriage opening/closing member is moved in a direction opposite to the above, the upper and lower reading/writing heads are contacted with the magnetic data recording surfaces by a predetermined load pressure.

Magnetic disk drive

A high-density flexible disk 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 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.

Large-capacity flexible disk and high-density type disk drive used therefor

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 is less than a distance h , where h 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 is the distance between the upper and the lower liners in a remaining area.

Method of making a disk cartridge comprising an improved magnetic disk medium

Head load pressure generation means is provided that flexibly supports an upper read/write head , via a leaf spring attached to a main body , that moves forward and backward along the tracks on a magnetic data recording medium , and that adjusts the head load pressure applied to the upper read/write head in accordance with whether a high-density or a low-density magnetic data recording medium is employed. Using this means, the head load pressure and the revolutions of a chucking motor are adjusted in accordance with whether a high-density or a low-density magnetic data recording medium is employed.

Large-capacity magnetic disk drive having head load pressure adjustment

In a method of carrying out defect management on reading data from a disk-shaped magnetic recording medium comprising a plurality of tracks separated into a user data area available to a user, an alternate area, and a management area, the method comprises the steps of retrying reading operation of data up to a maximum retry count when an error is detected on reading of data for a target sector in the user data area and of registering the target sector in a defect table in the management area and writing read-out data in an alternate sector in the alternate area in a case where a retry count is not less than a specific count when retry results in a success. Alternatively, the method comprises the steps of retrying reading operation of data up to a maximum retry count when an error is detected on reading of data for a target sector in the user data area, of overwriting read-out data in the target sector in a case where a retry count is not less than a specific count when retry results in a success, and of registering the target sector in a defect table in the management area and writing read-out data in an alternate sector in the alternate area in a case where an error is detected when overwritten data is reread from the target sector.

Defect management method for a magnetic recording medium

A flexible disk,includes a magnetic recording medium,, upper and lower jackets,and,enclosing the magnetic recording medium so that the magnetic recording medium is rotatable, and upper and lower liners,and,attached to inner surfaces of the upper and the lower jackets, respectively. The magnetic recording medium is provided with a rotation supporting hub,attached to a center portion thereof. The lower jacket is provided with an opening,to expose the hub on its outer surface. The lower liner,has an inner peripheral portion,extended to a gap,between the hub and an edge of the opening to thereby prevent the ingress of the dust through the gap.

Flexible disk liner arrangement capable of preventing the ingress of dust

In a floppy disk drive for writing/reading information to/from a floppy disk having a magnetic recording medium of a high memory capacity, a bottom plate of a driver casing defining a floppy disk containing space has a plurality of exhaust ports for expelling dust outside therethrough adjacent a front end opening for loading and unloading the floppy disk to the floppy disk containing space. The driver casing further has sealing elements for closing cable holes formed in the bottom plate and other gaps for blocking air flows from outside into the floppy disk containing space through the cable holes and gaps.

Floppy disk drive having dustproof structure for high capacity floppy disk

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.

Disk device with improved movement mechanism

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. The upper and the lower shells have inner surfaces faced to the upper and the lower subsidiary liners through the upper and the lower liners, respectively. At least one of the inner surfaces of the upper and the lower shells is provided with a recess for accommodating a bent portion of the magnetic disk medium when it is deformed or bent.

Floppy disk device with a pair of double-liners holding a floppy disk by

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.

Disk cartridge comprising an improved magnetic disk medium including an

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.

Flexible disk comprising a supporting hub for supporting a magnetic

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.

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Hachiouji, Japan

Yoshinori Tangi