Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.

Alphana Technology Co., Ltd.

Hiroshi Iwai

Takanori Watanabe

Tomoyuki Tashiro

Kazuyoshi Nagai

Mitsuo Kodama

Akira Nishio

Takuji Yamada

Susumu Ando

Yasuo Fukuzako

Yoshio Hirata

Hisayuki Aoshima

Isamu Hashimoto

In a disk drive device, a magnetic recording disk is mounted on a hub. A base rotatably supports the hub via a bearing unit. The base has a ring-shaped wall that surrounds the bearing unit and that protrudes towards the hub. A laminated core is fixed to the base. The laminated core has a ring portion and twelve teeth that radially outwardly extend from the ring portion. Coils are wound around the twelve teeth. The base includes an increasing-thickness portion formed so that the less the distance between a part of the increasing-thickness portion and the ring-shaped wall is, the thicker the part of the increasing-thickness portion becomes.

Impact resistant rotating device with increased-thickness portion relationship and suction plate configuration

The disk drive device includes a base member with a first upper surface and a second lower surface, a hub, a bearing unit arranged on the base member that rotatably supports the hub, a spindle drive unit that drives the hub to rotate, and a wiring member arranged on the second surface of the base member. The spindle drive unit includes a stator core having a salient pole with coil wound around, and a magnet opposed thereto. The base member includes a wire hole through which a wire is placed, with a first opening on the first surface and a second opening on the second surface. A concaved area on the second surface includes a lower slope, axially between the concaved area and the second opening on which a wiring member is arranged. The wire is connected to the wiring member, radially outside of an outer diameter of the magnet.

Disk drive device with hub and wiring member with increased thinness

In a disk drive device, a magnetic recording disk is to be mounted on a hub. A base plate rotatably supports the hub through a bearing unit. A laminated core is formed by laminating magnetic steel sheets, the laminated core having a ring portion and a plurality of teeth that extend radially from the ring portion, with coils wound around the plurality of teeth. A projecting portion is formed along the bearing unit, which axially extends toward the inner surface of the hub and by which the core is supported. The laminated core is fixed by sandwiching the ring portion between a seat formed on the base and an extending portion extending radially outward from the projecting portion.

Disk drive device having a projecting portion and a mounted laminated core

The disk drive device includes a base member, a hub, a bearing unit which is arranged on the base member and which rotatably supports the hub, and a spindle drive unit which drives the hub to rotate. The spindle drive unit includes a stator core having a salient pole, a coil wound around the salient pole and a magnet opposed to the salient pole. The base member includes a wire hole through which a drawing line of a wire for forming the coil passes, and a concavity formed at a bottom surface of the base member at least partly arranged radially outside the outer diameter portion of the magnet. The drawing line passes through the wire hole and is arranged along the bottom surface of the base member and connected to a wiring member at the concavity beyond the outer diameter portion of the magnet.

Disk drive device with hub with thinness and suppressed torque decrease

A disk drive device is provided with a recording disk, a base member, a bearing unit, and a hub member. In a marking step, unbalance information indicating the displacement of the center of gravity of the hub member with respect to the rotation center of the hub member is acquired, and an information mark containing the unbalance information is applied to at least the hub member or the base member. In an installing and adjustment step, the unbalance information is read form the information mark, and the position for installing the recording disk in an outer cylinder part is determined in accordance with the unbalance information so as to install the recording disk on the hub member.

Manufacturing method of disk drive device capable of reducing amount of unbalance, disk drive device and subassembly thereof

A disk drive device includes: a base member; a hub on which a recording disk is placed; a bearing unit arranged on the base member for rotatably supporting the hub; and a spindle drive unit for rotationally driving the hub, wherein the spindle drive unit includes a stator core having salient poles, a coil wound around each of the salient poles, and a magnet having a plurality of magnetic poles arranged in a circumferential direction opposed to the salient poles, the hub includes an outer cylindrical portion formed of a magnetic material and engaged with an inner periphery of the recording disk, and an inner cylindrical portion fixing an outer periphery of the magnet, the number of magnetic poles is an even number in a range of 10 to 16, and the number of salient poles is a multiple of 3 in a range of 12 to 24.

Disk drive device

A thrust dynamic pressure pattern is marked on a rotating member or fixed member set on a rest table. A pressure for marking is applied to a member to be marked in a cycle of applying and releasing the pressure, and a supplemental force for keeping the member to be marked, still is separately applied. According to the present embodiment, a rotating device can be provided that narrows down a bearing gap and improves the efficiency of raking up a lubricant so as to increase the dynamic pressure by reducing the deformation of the shape of the protrusions of a thrust dynamic pressure pattern and the variation in the height of the protrusions when forming the thrust dynamic pressure pattern in a method of producing a rotating device.

Production method of rotating device having thrust dynamic pressure generating site on which a thrust pressure pattern is formed and rotating device produced by said production method

A disk drive device is provided with a base, a hub on which a recording disk is to be mounted, a bearing unit arranged on the base and configured to rotatably support the hub, and a spindle drive unit configured to rotatably drive the hub. A circumferential ring wall portion is arranged on the outer circumference of the base and formed of a plastic.

Disk drive device rotationally driving recording disk

The disk drive device includes a base member, a hub, a clamper including an end that defines a central hole, a bearing unit which is arranged on the base member and which rotatably supports the hub, and a spindle drive unit which drives the hub to rotate. The hub is formed of magnetic material and includes an exterior cylinder portion engaged with an inner circumference of a recording disk and an interior cylinder portion to which the outer diameter portion of the magnet is fixed. The hub is provided with a fitting portion located radially outside of a space in the bearing unit for storing lubricant and configured to be fitted to the end of the clamper that defines the central hole.

In a disk drive device, a magnetic recording disk is to be mounted on a hub. A base plate rotatably supports the hub through a bearing unit. A projecting portion is formed on the upper surface of the base plate having a cylindrical side surface centered along the rotational axis of the motor. A laminated core is formed by laminating magnetic steel sheets and has a ring portion and a plurality of teeth radially extending from the ring portion. The disk drive device has a tubular vibration-deadening ring. The outer surface of the vibration-deadening ring is press-fitted into the ring portion at least at a position, along the motor's rotational axis, closer to the upper surface than to the lower surface of the laminated core; and the inner surface of the vibration-deadening ring is fixed to the side surface of the projecting portion.

Disk drive device having a vibration-reducing element

Disk drive device with appropriate number of combinations of magnetic poles and salient poles to reduce thickness of the disk drive device

The disk drive device includes a base member, a hub, a bearing unit which is arranged on the base member and which rotatably supports the hub, and a spindle drive unit which drives the hub to rotate. The spindle drive unit includes a stator core having a salient pole, a coil wound around the salient pole and a magnet opposed to the salient pole. The hub formed of magnetic material includes an outer cylinder portion engaged with an inner circumference of a recording disk and an inner cylinder portion to which an outer circumference of the magnet is fixed. The base member having a wire hole through which a wire from the coil passes, and a concavity that is formed at a bottom surface of the base member wherein the wire passes through the wire hole along a bottom face of the base member to a wiring member at the concavity.

Disk drive device with motor coil wiring arrangement to reduce thickness and suppressed torque decrease

A method manufacturing of a fluid dynamic bearing includes: forming a substantially linear groove having a length corresponding to a circumferential direction width of the dynamic pressure groove formed on the inner circumferential surface of a shaft housing hole portion, along the circumferential direction of a surface orthogonal to a first processing direction along the central axis direction of a work, by a byte that performs a micro alternating drive in a second processing direction orthogonal to the first processing direction; and extending the dynamic pressure groove that extends in the first processing direction by continuously forming the substantially linear grooves in the first processing direction by displacing the relative positions of the work and the byte in the first processing direction.

Method manufacturing of fluid dynamic bearing using cutting tool that performs micro alternating drive

In a brushless motor, the rotational frequency N (Hz) of the hub satisfies N&#x3c;F/(3*P+2), where F(Hz) is an Eigen frequency of the second order rocking-mode resonance when not rotating in the situation where the recording disk is mounted on the hub. The recording disk is mounted on the hub. A base plate rotatably supports the hub. A laminated core is fixed to the base. The core has a ring portion and a plurality of teeth that extend radially from the ring portion. Coils are wound around the plurality of teeth. The coils are three-phase driven. A cylindrical magnet is fixed to the hub. The cylindrical magnet are magnetized for driving with P (P is a natural number) poles along the circumferential direction and are arranged to radially face the plurality of teeth.

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Shizuoka, Japan

Hiroshi Iwai