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Spindle motor, recording and reproducing apparatus having the same, and method of manufacturing the spindle motor

A technology of spindle motor and recording disk, which is applied in the direction of information recording, magnetic recording, data recording, etc. on the magnetic disk, and can solve the problems of unable to press in normally, destroying the device, damaging the disk, etc.

Inactive Publication Date: 2007-03-14
PANASONIC HEALTHCARE HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, if the remaining burr falls during transportation or startup, it will enter between the disk and the recording head, damage the disk, or damage the device.
[0022] In addition, when fixing the back yoke to the hub, bonding or press-fitting is required, and when bonding is used, there is a problem that a clean dryer needs to be prepared or the power is greatly increased during production.
When using press-in, there are the above-mentioned problems of processing accuracy and flash, and normal press-in cannot be performed.

Method used

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  • Spindle motor, recording and reproducing apparatus having the same, and method of manufacturing the spindle motor
  • Spindle motor, recording and reproducing apparatus having the same, and method of manufacturing the spindle motor
  • Spindle motor, recording and reproducing apparatus having the same, and method of manufacturing the spindle motor

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Experimental program
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no. 1 approach

[0097] FIG. 1 is a schematic longitudinal sectional view of a spindle motor 1 according to a first embodiment of the present invention. O-O shown in FIG. 1 is the rotation axis of the spindle motor 1 . In addition, in the description of this embodiment, for convenience, the vertical direction in the drawing is expressed as "axially upper side", "axially lower side", etc., but this does not limit the actual mounting state of the spindle motor 1 .

[0098] The spindle motor 1 mainly includes a chassis 2 , a stator 5 , a fluid bearing device 4 , and a rotor 3 . The detailed configuration of each unit will be described below.

[0099] The chassis 2 constitutes a portion on the stationary side of the spindle motor 1 and is fixed to, for example, a housing (not shown) of the disk drive. The chassis 2 has a cylindrical portion 21 , and one end of a shaft 41 of a fluid bearing device 4 described later is fixed to the inner peripheral side of the cylindrical portion 21 . The stator ...

no. 2 approach

[0119] The above-mentioned spindle motor 1 according to the first embodiment is characterized by the positional relationship between the non-contact surface 36 e of the disk mounting portion 36 and the annular protrusion 37 , but the following cases are also considered.

[0120] FIG. 4 is a partial sectional view of the periphery of the rotor hub 131 of the spindle motor 101 according to the second embodiment of the present invention. In FIG. 4, the same code|symbol is attached|subjected to the same structure as 1st Embodiment.

[0121]As shown in FIG. 4 , the rotor hub 131 of the second embodiment further includes an annular reinforcing flange portion 138 formed on the outer peripheral side of the disk mounting portion 136 . In addition, in the present embodiment, one annular flat surface is formed on the axially lower side of the reinforcement flange portion 138 and the disk mounting portion 136 . That is, the axially lower surfaces of the reinforcing flange portion 138 and...

no. 3 approach

[0130] In addition, in addition to the first and second embodiments described above, the following embodiments are also conceivable. 6 is a partial sectional view of a rotor hub 331 of a spindle motor 301 according to a third embodiment of the present invention. In this spindle motor 301 , only the inner peripheral edge of the fixing portion 333 b abuts against the disk mounting portion 336 in the axial direction. More specifically, the yoke 333 also has an inclined surface 333c that inclines axially downward as it approaches the outer peripheral side at an axially upper end portion of the fixing portion 333b. In addition, only the inner peripheral edge of the fixing portion 333 b , more specifically, only the inner peripheral edge of the inclined surface 333 c is in contact with the disk mounting portion 336 . In other words, portions other than the inner peripheral edge of the fixing portion 333b do not contact the disk mounting portion 336 , and a gap L is formed between t...

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Abstract

A spindle motor (1) rotatably drives recording discs (81), and includes a base plate (2), a stator (5), a rotor hub (31), a yoke (33), a rotor magnet (34), and a hydrodynamic bearing (4). The rotor hub (31) includes a disc support cylindrical portion (35) for supporting the recording discs (81) in the radial direction, an annular disc mount portion (36) formed on an outer circumference of the disc support cylindrical portion (35) for mounting the recording discs (81) thereon, and an annular projection (37) formed on the lower portion of the disc mount portion (36) in the axial direction and having an outer circumference to which the yoke (33) is fixed. The disc mount portion (36) is formed with an annular non-contact surface (36e) formed on the upper portion in the axial direction, and an annular disc receiving face (36b) formed around an outer circumference of the non-contact surface (36e) and upward of the non-contact surface (36e) in the axial direction for being in contact with the recording disc (81) in the axial direction. The outer diameter of the annular projection (37) is smaller than the outer diameter of the non-contact surface (36e).

Description

technical field [0001] The present invention relates to a spindle motor and a manufacturing method thereof, in particular to a spindle motor for rotating a recording disk such as a magnetic disk or an optical disk and a manufacturing method thereof. Background technique [0002] In a hard disk drive, a spindle motor is known as a motor that rotationally drives a recording disk such as a magnetic disk or an optical disk. [0003] Conventional spindle motors mainly consist of a chassis, a stator mounted on the chassis, a rotor on which a recording disk is mounted, and a bearing device mounted on the chassis to support the rotor hub and ensure the rotor hub can rotate freely relative to the chassis. The rotor has: a rotor hub on which a recording disk is mounted, an annular yoke provided on the rotor hub, and an annular rotor magnet disposed on the yoke so as to radially oppose the outer peripheral side of the stator (for example, see Patent Documents 1, 2, 3.). [0004] Pate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B19/247H02K21/14H02K5/16H02K15/00
CPCG11B17/038G11B25/043G11B33/12
Inventor 白井彰人戒能直司
Owner PANASONIC HEALTHCARE HLDG CO LTD