Hitachi, Ltd.

Hitachi-Lg Data Storage, Inc.

Hitachi Consumer Electronics Co., Ltd.

Hitachi Video Engineering, Incorporated

Hitachi-Lg Storage, Inc.

Makoto Ibe

Yoshiaki Yamauchi

Shinya Tsubota

Juichi Morikawa

Seiji Hamaie

Nozomu Harada

Takayuki Fujimoto

Masanori Kochi

Shinya Asano

Hiroyuki Toyoda

Shinji Ozaki

Hideo Zama

Kuniyuki Kimura

Hideyuki Onuma

Hitoshi Takizawa

Mashanori Kochi

Nobuo Masuoka

Atsushi Inoue

Shigeo Ohashi

Ikuo Nishida

Seiichi Katou

Hidekazu Takeda

Kenmei Masuda

Manabu Ochi

Noboru Katohno

Seiji Ono

Kazuhiro Oda

Hideyuki Kawase

Yoshihiro Fukagawa

Kuniaki Hirayama

Keiji Sasao

Hitoshi Okabe

Toshio Osada

Kiyokazu Watanabe

Mitsukata Shizuya

Eiichi Hanawa

Tosio Uno

A disc drive apparatus comprises: a spindle motorfor hold a discand for rotate it; an optical headfor conducting either one of recording or reproducing of information onto/from the disc; a driver unit for moving the optical head in a radial direction of the disc; and a unit mechanism chassisfor supporting those thereon, fixedly, wherein the spindle motor is constructed with a rotational drive means made of a magnetic circuit, a rotor portion and a rotation shaft, which define a rotation body, and a spindle motor attachment plate to hold those thereon, and the spindle motor attachment plate has a semi-circular shaped plate configuration in a part thereof, nearly fitting to an outer diameter the rotor portion, in a direction where the optical head is provided, and has a step-like structure in thickness direction of the plate thereof, within a semi-circular shaped region with respect to a line connecting between corner portions on both ends of that semi-circular shape, and also bridging over that line.

Spindle motor attachment structure for a disc drive apparatus

An optical disc apparatus, presenting recording quality without degradation by an extreme temperature rise in an objective-lens drive mechanism in an optical pickup, includes a mechanical chassis on which a disc rotation mechanism, an optical pickup, and a transfer mechanism are mounted, a decorative plate that is a plate-shaped member located between the disc and the optical pickup and fixed on the mechanical chassis, a disc tray for loading and removing the disc, a circuit board for operation control, and an apparatus housing containing the components. A recess is formed in an indented shape in a portion of the mechanical chassis facing an outer peripheral region of the disc recording surface. An incline is formed in a position close to an opening of the disc tray for mounting the mechanical chassis and opposite the outer peripheral region of the disc recording surface, and slopes gently down to the recess.

Optical disc apparatus with mechanical chassis having a recess

For the purpose of suppressing an increase of temperature of a laser element, in an optical disc drive, even in case when recording/reproducing at such a low double speed that almost no expectation can be made upon the effect of the convection cooling due to circulating flow of an air, which is generated by rotation of a disc, and in particular, the structure for fixing both end portions of a main shaft, which is engaged with a transfer mechanism for moving an optical pickup into the disc radial direction, through the optical pickup, between two (2) pieces of shafts for supporting the optical pickup, one of which forms the main shaft, onto connector portions to be engaged with the both end portions of the main shaft, upon a mechanical chassis, on which is mounted at least a disc rotation mechanism, etc., has structures for enlarging a contacting area defined between the both end portions of the main shaft and the connector portions or pressure plates, each building up the connector portion (for example, a comb-like configuration).

Optical disc drive with main shaft having end portion of particular configuration

In an optical disk apparatus for recording and/or reading information with respect to an optical disk, comprising, a chassis for containing the optical disk, and a tray being movable with respect to the chassis and adapted to support the optical disk thereon so that the optical disk is movable with respect to the chassis, the chassis has an opening for discharging an air from an inside of the chassis to an outside of the chassis through the opening.

Optical disk apparatus with openings for discharging air from therein

In a recording disk apparatus, a pickup element and an electric element for at lease one of supplying an electric power to at least one of a recording disk driving motor and the pickup and processing a signal to be recorded into the recording disk and/or the signal read from the recording disk are prevented from overlapping each other as seen in a thickness direction of the recording disk to restrain a thermal conduction between the pickup element and the electric element so that a thermal conduction restraining area extending along an imaginary directional line crossing an imaginary straight line passing the pickup element and the electric element as seen in the thickness direction is formed between the pickup element and the electric element as seen in the thickness direction.

Recording disk apparatus having regions of constrained thermal conduction

In a recording disk drive apparatus including, a chassis including a chassis body, a spindle motor fixed to the chassis body to support and rotationally drive a recording disk, and a head supported on the chassis body to be movable on the chassis body in a radial direction of the recording disk so that an information is recorded into the recording disk and/or read from the recording disk through the head, a base member on which the chassis is supported, and an elastic member through which the chassis is supported on the base member so that a vibration transmitted from the chassis is absorbed at least partially by an elasticity of the elastic member, the chassis includes a counter member elastically supported on the chassis body with a spring constant for the counter member in which spring constant the counter member is elastically movable with respect to the chassis body.

Disk drive apparatus

In an optical disk drive device, in order to reduce structural vibration noise and aerodynamic sound during high-speed revolution, a recess is formed at the deeper end. This recess is in a position axially symmetric to a hole for the movement of an optical head with respect to the axis of a spindle motor, and its size is substantially equal to that of the movement hole. This recess serves to suppress the vibration mode of a disk tray and the air flow between the disk and the disk tray. Noise is reduced even when the disk is turning at high speed.

Disk drive device

In a rotary head drum of a recording/reproduction apparatus, for smoothly holding a magnetic tape over a guide step provided on a lower drum to guide the magnetic tape, part of a chamfer formed in the guide step is formed as a large chamfer in which a chamfered amount is larger than that of the remaining part of the chamfer. With the provision of the large chamfer, even if the lower edge of the magnetic tape deviates from the guide step when the tape is wound over or unwound from the drum, damages of the magnetic tape can be prevented. Therefore, the position and attitude control of tape withdrawing members can be greatly simplified and the magnetic tape can always run stably while being restricted in its position by the guide step. In the process of machining a tape running surface on the drum, by increasing the feed distance of a blade in the part of the chamfer where the large chamfer is to be formed by chamfering the guide step with a large chamfered amount, in comparison with the feed distance set in the remaining part of the chamfer, the large chamfer and the small chamfer can be both machined at the same time, resulting in simplified machining steps.

Tape guide structure of rotary head drum in recording/reproduction

A flying erase head for flying erasing which is used for improving the picture quality is provided on a rotating drum so as to be spaced substantially 180 degrees from the video head having first and second video head chips integrally fixed on a video head base. Therefore, a high picture-quality helical scan type magnetic recording and/or reproducing apparatus can be provided which is able to prevent the picture quality from being deteriorated by the vibration of the video head due to the rotation, and to satisfactorily make the over-writing on the tape and the assemble mode operation upon recording.

Helical scan type magnetic recording and/or reproducing apparatus having

A multiplex recording/reproducing system with at least four video signal recording/reproducing magnetic heads mounted on a rotating body with a predetermined interval in the direction of rotation of the rotating body. At least four audio signal recording/reproducing magnetic heads are mounted on the rotating body, alternately with the video signal recording/reproducing magnetic heads. The magnetic tape is forwarded while being wrapped on the rotating body over a region extending at least a multiple of the predetermined interval. Recording/reproducing circuits record and reproduce the video signal and the audio signal while switching over the video signal and the audio signal recording/reproducing magnetic heads in a predetermined order for every predetermined period. An erase signal is supplied to at least one of the audio signal recording/reproducing magnetic heads, which is disposed preceding to the video signal recording/reproducing magnetic head, which records the video signal on a magnetic tape track, during a period of time where no audio signal is supplied thereto.

Multiplex rotating magnetic head system for multiply recording and

A rotary magnetic head drum apparatus is constituted by at least one video head, a rotary drum having a tape running surface and a head mounting surface to which the video head is securely mounted, and a stationary drum provided with a tape guide and a tape running surface. In the rotary magnetic head drum apparatus, the tape running surface or the rotary drum has a lower end portion which is formed with a tapered portion whose diameter becomes gradually smaller along the axis of the rotary drum, and the tapered portion is projected such that its bottom end surface is located below the plane of the head mounting surface.

Jitter reducing tapered rotary drum for magnetic head apparatus

A rotary magnetic head cylinder device for use in a helical-scanning system video tape recorder has a projection provided on a tape running race of a stationary lower cylinder near a location at which a magnetic tape leaves from the lower cylinder. The projection is preferably integral with the tape running race and has a small area which is defined by a shoulder circumferentially extending identically with a tape guide shoulder contouring the lower edge of the tape running race and which spreads perpendicularly to the tape running race, and an upper surface coplanar with the top face of the lower cylinder, and a height defined by a protruded length radially outwardly toward the outer circumferential surface of the lower cylinder. The projection serves to reduce vibrations of the magnetic tape generated when the video head carried by the rotary upper cylinder leaves from the magnetic tape.

Rotary magnetic head cylinder device for suppressing vibrations ofa

A rotary magnetic head device including a fixed cylinder and a rotary cylinder having a tape guide face on the outer peripheries for enabling running of a tape thereon. At least one magnetic head is installed on the rotary cylinder and a first conductive member is electrically connected with at least one coil of the magnetic head. A head connector is installed on the rotary cylinder and includes a second conductive member electrically connected to the first conductive member with at least one unbalance compensating weight being mounted on the head connector for enabling the magnetic and the head connector to be balance with respect to an axis of the rotary cylinder when the head connector is installed on the rotary cylinder.

Balance compensated rotary magnetic head device

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Hitachinaka, Japan

Makoto Ibe