Hitachi Maxell, Limited

Hitachi, Ltd.

Yoshito Tanaka

Toshinori Sugiyama

Ken Ichiryu

Nobuhiro Umebayashi

Yoshitane Tsuburaya

Hideo Fujiwara

Osamu Inagoya

Takeo Sonobe

Takeshi Ohnuki

Naohiko Iwata

A disc cartridge is provided with an improved opening/closing slider mechanism which is small in size for positive opening/closing operation for a shutter. The disc cartridge has a front insertion side edge which has a reinforcement portion with guide rail mechanism in proximity thereto. The slider mounted on the guide rail mechanism has a longitudinally extending front face portion to the reverse side of which are integrated so as to form grooves interacting with the guide rail mechanism.

Disc cartridge having an opening/closing slider mechanism

A disk cartridge is provided with an improved opening/closing slider mechanism which is small in size for positive opening/closing operation for a shutter. The disk cartridge has a front insertion side edge which has a reinforcement portion with guide rail mechanism in proximity thereto. The slider mounted on the guide rail mechanism has a longitudinally extending front face portion to the reverse side of which are integrated a two-sectioned rear face portion and connecting portion, one of each section being disposed in an end portion of the front face portion, so as to form grooves interacting with the guide rail mechanism.

A disc drive apparatus including a cartridge holder for detachably holding a disc cartridge, which is provided with a shutter slidingly moving in one direction from a closed position to open windows formed in an upper surface and a lower surface of a cartridge case, has a pair of elongated opening/closing arms rotatably mounted on the cartridge holder for moving the shutter in an opening direction by an inserting force of the disc cartridge into the cartridge holder. Each proximal end of the pair of opening/closing arms are rotatably mounted at a predetermined internal on a ceiling plate forming the cartridge holder, at a disc cartridge insertion opening side, the one opening/closing arm for moving the shutter in the opening direction when the disc cartridge is inserted relative to the cartridge holder with a first surface thereof facing upwardly and the other opening/closing arm for moving the shutter in the opening direction when the disc cartridge is inserted relative to the cartridge holder with a second surface thereof facing upwardly. The pair of opening/closing arms cross each other with their distal end portions being disposed in a rearward direction of the cartridge holder. Pins provided at the distal end portions of the respective opening/closing arms for driving the shutter are disposed outside of the closed position of the shutter within the cartridge holder.

Disc drive apparatus having a mechanism for opening/closing the shutter

A disk cartridge accommodating a disk-type recording medium and adapted to be used on a recording/read-out apparatus having at least an upper head and lower head for accessing to the upper and lower surfaces of the disk, the disk cartridge comprising an upper case member and a lower case member which are assembled together to form a case defining therein an internal space for accommodating the disk, head windows formed in the upper and lower case members opposing each other so as to allow the heads to make access to the disk therethrough, the head windows extending in a predetermined radial direction of the disk, a recess formed by recessing the surface of each case member at a region extending between one longitudinal end of the head window and the edge of the case member closest to the longitudinal end of the head window, and a shutter capable of sliding on the case in the widthwise direction of the head windows so as to open/close the recesses and the head windows, the head window formed in the upper case member and the head window formed in the lower case member having different widths.

Disk cartridge

A magnetic head supporting device for supporting at least one magnetic head in contact with a flexible magnetic disk so as to record and reproduce signals in and from the flexible magnetic disk. The magnetic head supporting device comprises a gimbal spring having a central portion to which the magnetic head is secured at one side thereof; and a pivot which contacts on the opposite side of the central portion of the gimbal spring so as to support the center of the magnetic head through the intermediary of the gimbal spring. The gimbal spring includes an intermediate frame portion which supports the central portion in such a manner as to impart thereto a degree of freedom of rotation in the circumferential direction or in the radial direction of the magnetic disk, and an outer holding portion which supports the intermediate frame portion in such a manner as to impart thereto a degree of freedom of rotation in the direction perpendicular to the direction of freedom of rotation imparted by the intermeidate frame portion to the central portion. The width of parts of the intermediate frame portions extending in parallel to the direction of running of the surface of the magnetic disk, as measured in the direction perpendicular to the running direction, is determined to be smaller in the upstream portion of the intermediate frame portion than in the downstream portion of the same as viewed in the direction of running of the surfacae of the magnetic disk.

Magnetic head supporting device

A magnetic head apparatus used for a movable magnetic medium, comprising a magnetic head core in which a recording/reproducing core and an erasing core are respectively disposed on the entrance side of the movable medium and on the exit side of the movable medium, both of the cores being formed as an integrated magnetic core. The head cap of the recording/reproducing core is placed within a range defined between a position spaced about 0% of the longitudinal length of the integrated magnetic core apart from the center of the magnetic core toward the entrance side of the movable medium and another position spaced about 20% of the longitudinal length of the integrated magnetic core apart from the center toward the exit side of the movable medium.

Magnetic head apparatus used for movable magnetic medium with head gap

A magnetic head device with head cores connected to end surfaces of sliders, opposing each other on both sides of a magnetic disc, wherein one head core and slider combination is mounted on a gimbal spring, and a pivot member for pressing the magnetic disc, the pivot having plural pressing members aligned in the radial direction of the magnetic disc, the pivot being formed so that the pressing force can be applied generally uniformly to every part of the upper core and lower core.

Magnetic head device for improving head placement on a magnetic disc

An apparatus for detecting leakage of fluid comprises a bridge circuit composed of a heat generating resistance element connected in one arm and installed at a location where leakage of fluid may possibly occur and other resistor elements inserted in other arms, respectively, an input power supply source connected to the input of the bridge circuit and a differential amplifier connected to the output of the bridge circuit for amplifying an unbalance voltage produced by the bridge circuit, wherein the resistor elements inserted in the other arms of the bridge circuit are so dimensioned that the heat generating resistance element is maintained in a heat generating state.

Fluid leakage detecting apparatus

A fluid leakage detecting element comprises a heat generating resistive member and a temperature compensating resistive member disposed on a substrate. Each of the resistive members is prepared in the form of a paste of a metal which has a high temperature coefficient and a high thermal conductivity and whose melting point is higher than the baking temperature of the substrate. These resistive members are printed in thick film form on the substrate which is sufficiently electrical insulating and has a high thermal conductivity.

Growing community of inventors

Ibaraki, Japan

Yoshito Tanaka