Mitsumi Electric Company Ltd.

Hisateru Komatsu

Makoto Takahashi

Makoto Konno

Noriyuki Kobayashi

Takashi Watanabe

Mamoru Takahashi

Akira Shibata

Koichi Seno

Osamu Kojima

Yoshihito Otomo

Hisashi Shibata

Masashi Sato

Hiroshi Sampei

Toshinori Kurosaka

Yoshihiro Okuyama

Yoshimi Hanaika

Hideaki Hayasaka

Mitsutoshi Ohizumi

Kenji Katoh

Kouichi Hosoya

Shinji Endo

Norito Yasuwaki

A floppy disk drive includes a frame having a bottom portion and left and right walls and a casing for covering the frame. The casing includes an upper cover for covering an upper side of the frame and a lower cover for covering a lower side of the frame, in which the upper cover has a top plate and left and right side plates, and the lower cover has a bottom plate and left and right plates. Each of the side walls of the frame is designed so as to have size and height that are partially overlapped with the side plate of the upper cover and the side plate of the lower cover, respectively, at each side of the casing, thereby providing a triplex structure for reinforcing each side of the casing.

Floppy disk drive

In a disk chucking mechanism for use in a flexible disk drive adopting a spindle motor () of a Hall sensor-less method, a driving pin (A) freely received in a driving oval hole () of a flexible disk () has a shape (shape of fan) where a catch factor portion is cut so that the driving pin (A) is not in contact with an inner edge of the driving oval hole () as much as possible when a rotor (A) of the spindle motor () rotates in the opposite direction (counterclockwise).

Disk chucking mechanism having a fan-shaped driving pin

In a flexible disk drive for a flexible disk, a main frame defines a receiving portion for receiving the flexible disk. The main frame has a principal surface which faces the receiving portion and extends in a first direction and a second direction perpendicular to the first direction. A carriage assembly is mounted on the main frame and has a magnetic head for accessing the flexible disk. The carriage assembly is movable to carry the magnetic head along the principal surface. An eject base is coupled to the main frame and has a main portion facing the principal surface and side plates opposite to each other in the first direction. Between the main frame and the eject base, an eject plate is placed movable in the second direction for ejecting the flexible disk from the receiving portion. The eject plate has side plates facing the side plates of the eject base in the first direction, respectively. A guiding mechanism is coupled to the side plates of the eject base and to the side plates of the eject plate and guides movement of the eject plate in the second direction.

Flexible disk drive having an eject base usable as a cover

A front shutter () comprises arm portions () formed at both ends of an upper side of a door member (). While one shaft portion () is formed on one of the arm portions () through a positioning portion (), the other shaft portion () is formed on the other of the arm portions (). The shaft portions () are inserted into holes formed on a cut and raised piece () and a side wall () respectively. The cut and raised piece () and the side wall () rotatably supports the shaft portions (). A gap between the arm portion () and the side wall () is wider because of no positioning portion between the arm portion () and the side wall (). The shutter spring () not only gives force to the front shutter () in a closing direction but also presses the front shutter toward the cut and raised piece () to prevent the shutter from moving along a pivot defined by the shaft portions ().

Front shutter attaching structure and flexible disk drive having the same

A flexible disk drive includes a case and a disk holder provided in the case. A flexible disk is mounted on the disk holder. A part of the disk holder abuts against an inner face of the case. Preferably, the part of the disk holder is a tip end portion of the disk holder. The tip end portion of the disk holder is bent in a slanted direction so as to enlarge an inlet of the disk holder for the flexible disk to be inserted.

Flexible disk drive

In order to provide a positioning mechanism that can be processed easily and accurately by press forming and a frame structure having the same, especially a main frame and a method of manufacturing the same, the invention provides a frame structure of the flexible disk drive including a pair of projections fitted into a pair of corresponding positioning holes on the inserted flexible disk. The pair of projections is formed by cutting and raising.

Frame structure and flexible disk drive having the same

A flexible disk drive comprises a main frame, a magnetic head, a head assembly supporting the magnetic head so as to move the magnetic head in a tracking direction, and a guide rod fixedly attached onto the main frame by a metal fitting to guide the head assembly in the tracking direction. The main frame is made of a sheet metal and is provided with a recessed portion having a sidewall. The sidewall is faced to an end face of the guide rod with a small space left therebetween so that the recessed portion restricts the movement of the guide rod in the tracking direction.

Low-profile flexible disk drive simple in structure

A spindle motor structure includes a solenoid coilprovided above a flexible boardprovided at one face of a base plate of FDD to align in a circumferential direction centering on one axis and a turn table covering the solenoid coiland provided rotatably centering on the one axis. The spindle motor structure can provide FDD capable of achieving a reduction in cost by reducing a number of parts of PWB and the like using a silicon steel plate, i.e. silicon steel plate PWB.

Spindle motor structure mounted directly on a base plate of a thin type flexible disk drive

A flexible disk drive includes a notched portion at a main frame portion arranged with a motor, a sub board includes a cut groove at an end portion thereof and a wire extended from the motor is held by the cut groove of the sub board and is connected to the main board. Thereby, there can be provided FDD capable of achieving a reduction in cost by a reduction in a number of parts and simplification of a structure thereof.

Flexible disk drive including sub circuit board with a hall element mounted thereon

A main frame has a size where only high precision parts are mounted thereon and has structure where a front portion of a frame is deleted. A lower cover, which covers a lower surface of the main frame, has a function as a sub-frame mounting low precision parts corresponding to the front portion of the deleted frame, thereby playing a role as one frame by a combination of the main frame and the sub-frame of the lower cover.

Flexible disk drive having a frame structure comprising a main frame and a sub-frame of a lower cover

In a disk drive for using a disk cartridge including a magnetic disk, a reinforcing arrangement is coupled to a main frame, a main board fixed to the main frame, and a head assembly which is movable in a radial direction of the magnetic disk. The reinforcing arrangement inhibits internal collision in the head assembly even when the disk drive is subjected to a mechanical shock. The main board and the head assembly are placed between the main frame and a cover which is opposite to the main frame.

Disk drive having a reinforcing arrangement against an external stress applied thereto

In a disk drive for using a disk cartridge including a magnetic disk, a reinforcing arrangement is coupled to a main frame, a main board, and a disk receiving/ejecting mechanism which is for receiving and ejecting the disk cartridge. The reinforcing arrangement resists an external stress applied between the main frame and a cover opposite to the main frame to protect a head assembly which is movable between the main frame and the cover in a radial direction of the magnetic disk. The main board and the disk receiving/ejecting mechanism are placed between the main frame and the cover and are coupled to the main frame.

A projecting portion is formed on an edge, which provides a notch for an eject button, of a front shutter of an FDD. The projecting portion projects toward the eject button. The eject button provides a cavity for canceling interference between the projecting portion and the eject button in a state without external force. Upon receiving external force, the eject button is pressed to the projecting portion. In this state, the front shutter is forced to rotate in a closing direction thereof. Because the front shutter keeps a closed state, the force given to the projecting portion has a direction parallel to a main surface of a door member of the front shutter. Therefore, the door member is not bent by the external force and the front shutter does not come off from a main frame of the FDD.

Disk drive having a structure for preventing a front shutter from coming off from a main frame

A front shutter attaching structure comprises flanges formed on peripheral surfaces of coaxial pivots of a front shutter and hooks formed at a cover for covering an upper side of a main frame. The front shutter is attached to the main frame by inserting of the pivots into holes formed in side plates of the main frame. Because the flanges are impossible to be inserted into the holes of the main frame, they restrict movement of the front shutter in a direction along the pivots against the main frame. Each of the hooks is located between a door member of the front shutter and each of the flanges when the cover is fixed to the main frame. The hooks restrict movement of the flanges in the direction along the pivots at the base side of the pivots.

Disk drive having a front shutter attaching structure capable of preventing a front shutter from coming off from a main frame

A flexible disk drive comprises a magnetic head, a head carriage, and a guide rod, attached by a metal fitting on a main frame of the flexible disk drive, guiding the head carriage in the tracking direction. The metal fitting has a longitudinal member which has first and second ends and is provided with a protruding/caved portion and a hole portion at opposite ends, respectively. The protruding/caved portion is formed on the first end of the metal fitting and engaged with a caved/protruding portion formed on the main frame. The hole portion is formed on the second end of the metal fitting and a male screw is screwed into a female screw formed on the main frame through the hole portion.

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Hisateru Komatsu