Hitachi Maxell, Limited

Hitachi Maxwell, Ltd.

Nintendo Co., Ltd.

Mitsumi Electric Company Ltd.

Yoshitake Kato

Minoru Fujita

Kazuya Fukunaga

Hiroshi Maruyama

Shinichiro Oda

Akira Katami

Junji Takamoto

Masahiko Ota

Yoshitane Tsuburaya

Masayuki Yukawa

Tamotsu Iida

Mitsuaki Naoi

Nobuhiko Naganawa

Hiroyuki Yoshimura

Fujio Matsumoto

Yoshihisa Hitomi

Makoto Miura

Tadahiro Kuwa

Masanori Uematsu

Scratches on the recording disk caused by sliding of a disk cartridge shutter is prevented by slidably inserting first and second shutters between a tray and a case on the opposite side to a recording disk accommodating portion of the tray. The first shutter simultaneously opens and closes a case side driving shaft insert hole, a case side head insert hole, a tray side driving shaft insert hole, and a tray side head insert hole. The second shutter opens and closes a terminal hole. The second shutter is opened independently of the first shutter and is held in a position so that the case side driving shaft insert hole, the case side head insert hole, the tray side driving shaft insert hole, and the tray side head insert hole are not closed. Closing the first shutter, however, causes the second shutter to also close.

Disk cartridge having a single closing energizer for closing two

A data recording cartridge provided with a cartridge case and a recording medium accommodated therein, wherein the cartridge case is molded from at least one of the following materials:

Data recording cartridge including a flexible magnetic recording medium

A magnetic disk comprises a flexible disk-shaped magnetic sheet with a magnetic layer formed on a substrate film and having an aperture in the center of the disk; a center hub made of metal sheet and having a flange on its outer peripheral part, fabricated by inserting the center hub into the aperture of the magnetic disk-sheet, whereby the flange and an inner peripheral part of the magnetic sheet are bonded together, and wherein a circular recess with a cross-sectional shape, such as step or tapered-shape is provided in the outer peripheral part of the center-hub flange.

Magnetic disk assembly having a hub with a circular recess extending

A disc cartridge comprising a cartridge case having head insert openings and encasing a disc-type recording medium rotatably mounted therein and a shutter for opening and closing the head insert openings mounted on the cartridge case, the shutter being molded from a synthetic resin material having a water absorbability of not more than 0.05% by weight and a maximum bending strength of not less than 500 kg/cm.sup.2. The resulting shutter has a good resistance to deformation by an external force during working, handling and preservation. The shutter also comprises spherical crystals.

Disc cartridge shutter

A disk cartridge comprises a cartridge case including an upper case, a lower case and a head insertion aperture at a predetermined position, a pair of cleaning sheets respectively secured to inner surfaces of the upper and lower cases, a disk disposed rotatably between the cleaning sheets, and a resilient member disposed between at least one of the cases and associated cleaning sheet, the resilient member being adapted to press a part of the cleaning sheet against a disk surface, wherein the resilient member is disposed in the vicinity of the head insertion aperture and upstream of the head inserting port in the rotational direction of the disk, thereby enhancing the effect of cleaning of the disk surfaces to be read/written by the magnetic head.

Disk cartridge with improved cleaning mechanism

A disc cartridge including a disc sheet and a hub assembly formed by an upper half member and a lower half member, one of which has a positioning projection, and the disc sheet is provided with a hole engageable with the positioning projection so that the disc sheet can be placed in a correct position by fitting the hole of the disc sheet with the positioning projection.

Disc cartridge with alignment elements on two hub halves

A disk cartridge has a pair of cases, one of the cases including boss portions each having a welding allowance at a top end thereof, the boss portions being projected from one of the cases, the other of the cases being provided with cylindrical portions into which the boss portions are respectively inserted when the cases are superposed, and the welding allowances of the boss portions and inner bottom portions of the cylindrical portions are supersonically-welded to each other, the disk cartridge further including portions for controlling the air flow which includes resin particles generated at the time of the supersonic welding in such a manner that the air flow is directed to that outside of a region in which a disk rotates, the controlling portions being situated adjacent to the welded portions of the cases, thereby avoiding fear of resin particles being adhered to the disk surfaces during ultrasonic welding.

Disk cartridge case formed by ultrasonic welding

A disc cartridge comprising a cartridge case for rotatably accommodating a disc and a shutter for opening and closing at least one head accessing opening defined on the cartridge case, wherein the shutter comprises at least one plate member for opening and closing the head accessing opening and a connecting plate connected with one end of the plate member facing to one end face of the cartridge case, a first engaging member formed on the connecting plate toward the one end surface of the cartridge case and a second engaging member formed on the one end face of the cartridge case for engagement with the first engaging member to slidably mount the shutter on the cartridge case.

Shutter assembly for a disk cartridge

A shutter for a disk cartridge comprises a pair of upper and lower side plates of substantially same shape, juxtaposed to each other, and an end plate connected to the upper and lower side plates at one end, and integrally molded from a compound plastic containing a filler and a lubricant having a melt index of 30 to 60. The upper and lower side plates each have a thickness of not more than 1.0 mm and a ratio of the thickness to the surface area of the upper and lower side plates each of 1/5,000 to 1/500. The shutter can be molded at a low cost with a good moldability, and has high mechanical strength, heat resistance and slidability.

Disk cartride having an improved shutter

A disk cartridge comprises a case and a disk encased in the case, the disk having a hub comprising a flange of thin metal sheet and a control ring integrated with the flange by outsert molding the control ring from a compound plastic containing 5 to 40% by weight of a filler, and a dimensional ratio of flange plate thickness to control ring inner diameter being 1/50 to 1/30. The hub has a higher plane precision, a higher attrition resistance, and a higher heat resistance.

Disk cartridge with a hub having an outsert molded control ring

In a recording disc assembly comprising a recording disc, a hub made of plastic resin material, having a pair of reference surfaces formed on the inner surface of a rotational shaft insertion hole for positioning the disc assembly in a recording device by engagement of a rotational shaft of the recording device and a supporting plate made of metal integrally formed with the hub, the supporting plate is provided with at least a stepped portion near the reference surfaces so as to assure good accuracy of the flat plane of the reference surfaces when the hub is molded.

Recording disc assembly

A disk cartridge comprises a cartridge casing having a head entry aperture, a disk recording medium rotatably accommodated in the cartridge casing, a shutter for opening/closing the head entry aperture, and a spring member for resiliently biasing the shutter in the closing direction. The spring member includes a proximal end portion engaged with the cartridge casing, a resilient end portion engaged with the shutter, and an intermediate engaging portion provided between the proximal end portion and the resilient end portion, a displacement-preventing portion is provided in an area where the intermediate engaging portion is passed upon an opening/closing operation of the shutter, and the intermediate engaging portion is adapted to be brought into contact with the displacement-preventing portion, thereby canceling a force of the spring member to spring out or fall in, and enabling to enhance reliability.

Disk cartridge with shutter biasing device

A disk cartridge having a cartridge casing containing a double-sided disk recording medium, a pair of head entry apertures formed in both surfaces of the cartridge casing, and a shutter member having a U-shaped profile and slidably attached to the cartridge casing while pinching the same, the shutter member being at least capable of opening and closing the head entry apertures. At least one of the surfaces of the shutter member is provided with: a cover portion having a width slightly larger than the width of the head entry apertures in the direction of sliding movement of the shutter member; a front plate portion projecting from the cover portion on the opposite sides thereof in the sliding direction, and moving along the front end surface of the cartridge casing; and abutting surfaces formed at the opposite ends of the front plate portion and adapted to be brought into contact with a shutter opening member.

Growing community of inventors

Ibaraki, Japan

Yoshitake Kato