KR20130012438A - Spindle motor - Google Patents

Spindle motor Download PDF

Info

Publication number
KR20130012438A
KR20130012438A KR1020110073659A KR20110073659A KR20130012438A KR 20130012438 A KR20130012438 A KR 20130012438A KR 1020110073659 A KR1020110073659 A KR 1020110073659A KR 20110073659 A KR20110073659 A KR 20110073659A KR 20130012438 A KR20130012438 A KR 20130012438A
Authority
KR
South Korea
Prior art keywords
circuit board
base plate
bearing housing
bearing
stator
Prior art date
Application number
KR1020110073659A
Other languages
Korean (ko)
Inventor
김세종
Original Assignee
엘지이노텍 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020110073659A priority Critical patent/KR20130012438A/en
Publication of KR20130012438A publication Critical patent/KR20130012438A/en

Links

Images

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
    • G11B33/1446—Reducing contamination, e.g. by dust, debris
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs

Abstract

The spindle motor includes a base plate having a through hole formed therein; A circuit board disposed on the base plate and including an opening formed at a position corresponding to the through hole; A bearing assembly coupled to the through hole, the bearing assembly including a bearing housed in the bearing housing and a bearing housing partially preventing the lifting of the circuit board by pressing the circuit board around the opening; A stator fixed to an outer circumferential surface of the bearing housing and electrically connected to the circuit board; A rotating shaft rotatably coupled to the bearing; And a rotor coupled to the rotation shaft and rotating by the action of the stator.

Description

Spindle Motors {SPINDLE MOTOR}

The present invention relates to a spindle motor.

In recent years, an optical disk drive (ODD) has been developed for recording massive data on an optical disk or reading data recorded on an optical disk.

The optical disk drive includes a spindle motor for rotating the optical disk at high speed, an optical pickup module for reading data from or writing data to the optical disk rotating at high speed, and a stepping motor for driving the optical pickup module in the radial direction of the optical disk. .

Among them, the spindle motor for rotating the optical disk at high speed includes a bearing housing for rotatably supporting the rotating shaft, a bearing housing accommodating the bearing, a stator fixed to the outer circumferential surface of the bearing housing, a rotor rotatably housed in the bearing, and a bearing housing. It includes a base plate for fixing and a circuit board disposed on the base plate.

A gap is formed between the upper surface of the base plate of the conventional spindle motor and the stator, and foreign matter flows into the gap, which may cause a malfunction of the spindle motor and a reduction in life.

Therefore, in the conventional spindle motor, a circuit board disposed on the top surface of the base plate unnecessarily extends to the bottom of the stator in order to reduce the gap formed between the stator and the top surface of the base plate.

However, when the circuit board is extended between the stator and the base plate, the gap between the base plate and the stator can be reduced to prevent some foreign matter from entering the spindle motor, but the unnecessary area of the expensive circuit board is increased. The manufacturing cost of the spindle motor is increased.

The present invention provides a spindle motor in which unnecessary area increase of the circuit board, foreign material inflow, and the circuit board are separated from the base plate to prevent contact between the circuit board and the stator.

The technical object of the present invention is not limited to the above-mentioned technical objects and other technical objects which are not mentioned can be clearly understood by those skilled in the art from the following description will be.

In one embodiment, the spindle motor includes a base plate formed with a through hole; A circuit board disposed on the base plate and including an opening formed at a position corresponding to the through hole; A bearing assembly coupled to the through hole, the bearing assembly including a bearing housed in the bearing housing and a bearing housing partially preventing the lifting of the circuit board by pressing the circuit board around the opening; A stator fixed to an outer circumferential surface of the bearing housing and electrically connected to the circuit board; A rotating shaft rotatably coupled to the bearing; And a rotor coupled to the rotation shaft and rotating by the action of the stator.

According to the spindle motor according to the present invention, a cover portion protruding from the base plate is formed, the foreign matter inflow prevention fence is formed in the cover portion, and the circuit board is formed without bearing the circuit board in the cover portion by the foreign matter inflow prevention fence. By pressing to prevent the circuit board is lifted from the base plate has a variety of effects that can prevent the increase in life, the production cost and the defect caused by the contact between the circuit board and the stator to prevent foreign material inflow.

1 is a perspective view of a spindle motor according to an embodiment of the present invention.
2 is a cross-sectional view of Fig.
3 is an enlarged view of a portion 'A' in FIG.
4 is a perspective view illustrating the base plate and the circuit board of FIG. 1.
FIG. 5 is a perspective view illustrating the base plate, the circuit board, and the bearing housing of FIG. 1. FIG.
FIG. 6 is a cross-sectional view taken along line II ′ of FIG. 5.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. The definitions of these terms should be interpreted based on the contents of the present specification and meanings and concepts in accordance with the technical idea of the present invention.

1 is a perspective view of a spindle motor according to an embodiment of the present invention. 2 is a cross-sectional view of Fig. 3 is an enlarged view of a portion 'A' in FIG. 4 is a perspective view illustrating the base plate and the circuit board of FIG. 1. FIG. 5 is a perspective view illustrating the base plate, the circuit board, and the bearing housing of FIG. 1. FIG. 6 is a cross-sectional view taken along the line II ′ of FIG. 5.

1 and 2, the spindle motor 800 includes a base plate 100, a circuit board 200, a bearing assembly 300, a stator 400, a rotation shaft 500, and a rotor 600. do. In addition, the spindle motor 800 may include a clamp 700.

4 and 5, the base plate 100 is formed in a plate shape, for example, the base plate 100 may be formed by pressing a metal plate. In the central portion of the base plate 100 is formed a through hole 101 for coupling with the bearing assembly 300 to be described later.

In addition, from one side edge of the base plate 100, when viewed in plan view, a cover portion 110 having a semi-circular plate shape is formed, the cover portion 110 is a core or rotor of the stator 400 to be described later ( 600) serves to primarily prevent foreign matter from flowing between the base plate 100 and the base plate 100.

On the other hand, the foreign matter inflow prevention fence 120 is formed on the upper edge of the cover portion 110 protruding or extending in a semi-circular plate shape from one edge of the base plate 100, the foreign matter inflow prevention fence 120 is the stator 400 Secondary to prevent foreign matter from flowing between the core or the rotor 600 and the base plate (100) of.

The foreign matter inflow preventing fence 120 may be formed, for example, by bending the cover part 110 in the direction toward the rotor 600 disposed on the base plate 100.

The foreign matter inflow preventing fence 120 may be formed, for example, in a direction substantially perpendicular to the cover part 110. Alternatively, the foreign matter inflow preventing fence 120 may be formed at an obtuse angle with respect to the upper surface of the cover 110 or at an acute angle with respect to the upper surface of the cover 110.

In addition, in order to prevent foreign matter from flowing into the stator or the rotor, the upper surface of the cover part 110 may be formed with a thin film of foreign matter adhesion film that adsorbs the foreign matter viscously.

On the other hand, the foreign material inflow prevention fence 120 may include a synthetic resin fence is cured by applying a band shape by a dispenser or the like along the upper edge of the cover 110.

Referring back to FIGS. 1 to 4, the circuit board 200 is disposed on the top surface of the base plate 100, and the circuit board 200 uses a driving signal applied from the outside as a coil of the stator 400 to be described later. Is authorized.

In one embodiment of the present invention, the circuit board 200 is formed on the base plate 100, the circuit board 200 is not formed on the cover 110 to reduce the production cost.

In one embodiment of the present invention, when the circuit board 200 is not formed on the cover unit 110 to reduce the production cost, space is formed in the cover unit 110 by the thickness of the circuit board 200 is foreign matter There is a possibility of inflow, but in one embodiment of the present invention, since the foreign matter inflow preventing fence 120 is formed in the cover 110, the inflow of foreign matter into the stator 400 or the rotor 600 through the cover 110. It can prevent.

An opening 201 exposing the through hole 101 of the base plate 100 is formed in the circuit board 200, and the circuit board 200 is not formed in the cover part 110 of the base plate 100. The opening 201 of the circuit board 200 is formed along a part of the through hole 101 as shown in FIGS. 4 and 5 when viewed in plan view.

In one embodiment of the present invention, the portion of the circuit board 200 disposed outside the rotor 600 to be described later is fixed to the base plate 100 by a fastening screw or the like.

5 and 6, the bearing assembly 300 includes a bearing housing 310 and a bearing 320.

The bearing housing 310 is formed, for example, in a cylindrical shape having a hollow, and a coupling protrusion 317 coupled to the through hole 101 of the base plate 100 protrudes from a lower surface of the bearing housing 310.

The coupling protrusion 317 of the bearing housing 310 is coupled to the through hole 101 of the base plate 100. The bearing housing 310 coupled to the through hole 101 of the base plate 100 is pressed against the periphery of the opening 201 of the circuit board 200 formed in the base plate 100 to form a circuit board around the opening 201 ( 200 prevents lifting from the upper surface of the base plate 100.

When the bearing housing 310 does not press the circuit board 200 disposed on the base plate 100, a part of the circuit board 200 is lifted from the top surface of the base plate 100 and the top surface of the base plate 100. The circuit board 200 spaced apart from each other may be in contact with a core or a coil of the stator 400 to be described later.

A support plate 319 for supporting a lower end of the rotating shaft 500 to be described later is disposed on the lower surface of the bearing housing 310, and a thrust bearing 319a is provided at a portion of the supporting plate 319 contacting the lower end of the rotating shaft 500. ) Is formed.

On the other hand, when pressing the circuit board 200 by using the lower surface of the bearing housing 310, the height and volume of the spindle motor 800 can be increased by the thickness of the circuit board 200.

In an embodiment of the present invention, in order to prevent the height and volume of the spindle motor 800 due to the combination of the circuit board 200 and the bearing housing 310, the bearing housing 310 is shown in FIGS. 2, 3 and 6. As shown in the figure, the lifting prevention part 315 is formed.

The lifting prevention part 315 is formed in a groove shape at a corner formed by the lower surface 311 of the bearing housing 310 and the side surface 312 of the bearing housing 310 that meets the lower surface 311, and the lifting prevention part ( 315 provides a space for receiving a periphery of the opening 201 of the circuit board 200. In one embodiment of the present invention, the lifting prevention portion 315 may be formed, for example, in the shape of an annular groove along the edge of the bearing housing 310.

In one embodiment of the present invention, the height of the lifting prevention portion 315 is formed to be substantially the same as the thickness of the circuit board 200, so that the upper surface of the circuit board 200 is in contact with the bearing housing 310. Alternatively, the height of the lifting prevention portion 315 is formed to be higher than the thickness of the circuit board 200, and protrudes a plurality of protrusions from the inner surface formed by the lifting prevention portion 315 facing the upper surface of the circuit board 200. The circuit board 200 may be pressed by the protrusions. As such, when the upper surface of the circuit board 200 is pressed by the protrusions, the volume of the bearing housing 210 may be reduced to further reduce the production cost.

Meanwhile, a gap is formed between the side surface of the circuit board 200 and the inner surface of the bearing housing 310 formed by the lifting prevention part 315 so that the circuit board 200 does not interfere with the lifting prevention part 315. Can be formed.

The bearing 320 is formed in a cylindrical shape inserted into the bearing housing 310, the bearing 320 is formed with a rotating shaft hole for coupling with the rotating shaft 500 to be described later. In one embodiment of the present invention, the bearing 320 may comprise an oil-impregnated oil sintered impregnated bearing.

Referring back to FIG. 2, the stator 400 includes a core 410 and a coil 420. The core 410 has a structure in which a plurality of iron pieces having an opening and a plurality of core parts protruding radially from the outer circumferential surface are stacked, and the core 410 is fixed to the step 318 of the bearing housing 300.

The coil 420 is wound around each core part formed in the core 410.

The rotary shaft 500 is inserted into the rotary shaft hole of the bearing 320 of the bearing assembly 300, and the lower end of the rotary shaft 500 is in contact with the thrust bearing 319a supported by the support plate 319.

The rotor 600 includes a yoke 610 and a magnet 620. In addition, the rotor 600 may further include a suction magnet 630.

The yoke 610 may include a yoke top plate 612 and a yoke side plate 614.

The yoke top plate 612 is formed in a disk shape when viewed in plan view, and a cylindrical yoke burring portion 613 is formed at the center of the yoke top plate 612 toward the top surface of the yoke top plate 612. The yoke burring part 613 is press-fitted to the rotation shaft 500.

The yoke side plate 614 extends downward from the yoke top plate 612, and a space is formed inside the yoke 610 by the yoke side plate 614 and the yoke top plate 612.

The magnet 620 is formed along the inner surface of the yoke side plate 614, and is generated by the magnetic field generated from the magnet 620 and the magnetic field generated from the coil 420 wound on the core of the core 410. Rotation force is generated in the yoke 610 and the rotation shaft 500 by the attraction force or the repulsive force.

The yoke top plate 612 of the yoke 610 is disposed with a clamp 700 for chucking the optical disk.

Meanwhile, the suction magnet 630 may be disposed on any one of the inner surface of the yoke upper plate 612 and the upper surface of the core 410 facing the inner surface of the yoke upper plate 612.

In one embodiment of the invention, the suction magnet 630, for example, is disposed on the inner side of the yoke top plate 612, the suction magnet 630 disposed on the inner side of the yoke top plate 612 is a core ( The rotor 600 is stably rotated by pulling the 410 by magnetic force.

As described in detail above, the cover portion protruding from the base plate is formed, the foreign matter inflow preventing fence is formed on the cover portion, and the circuit board is formed as a bearing housing without forming the circuit board in the cover portion by the foreign matter inflow preventing fence. Pressing the circuit board to prevent lifting from the base plate has a variety of effects that can prevent the increase in life, the production cost and the defect caused by the contact between the circuit board and the stator to prevent foreign material inflow.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

800 ... spindle motor 100 ... base plate
200 ... circuit board 300 ... bearing assembly
400 ... stator 500 ... rotation shaft
600 ... rotor 700 ... clamp

Claims (11)

A base plate having a through hole formed therein;
A circuit board disposed on the base plate and including an opening formed at a position corresponding to the through hole;
A bearing assembly coupled to the through hole, the bearing assembly including a bearing housed in the bearing housing and a bearing housing partially preventing the lifting of the circuit board by pressing the circuit board around the opening;
A stator fixed to an outer circumferential surface of the bearing housing and electrically connected to the circuit board;
A rotating shaft rotatably coupled to the bearing; And
And a rotor coupled to the rotating shaft and rotating by the action of the stator. The method of claim 1,
A spindle motor including a lifting prevention portion formed in a groove shape at an edge formed by a lower surface of the bearing housing and a side surface of the bearing housing meeting the lower surface to receive the opening around the circuit board and to prevent lifting by pressing the circuit board; . The method of claim 2,
The lifting prevention portion is a spindle motor formed in an annular groove shape for accommodating the circuit board. The method of claim 3,
And a height of the lift preventing portion is equal to a thickness of the circuit board. The method of claim 1,
The stator includes a core coupled to an outer circumferential surface of the bearing housing and including a radially protruding core portion and a coil wound on the core portion,
The rotor includes a yoke coupled to the rotation shaft to cover the core and a magnet disposed in a portion of the yoke facing the core. The method of claim 1,
The base plate has a spindle motor formed on the base plate to cover the lower portion of the stator to prevent foreign matter from entering the stator. The method according to claim 6,
The cover motor is provided with a foreign material inflow preventing fence for preventing the foreign material from entering between the rotor and the base plate. The method of claim 7, wherein
The foreign matter inflow preventing fence is formed by bending the cover part in a direction toward the rotor. The method of claim 7, wherein
The foreign matter inflow prevention fence is a spindle motor including a strip-shaped synthetic resin fence is applied along the edge of the cover portion to prevent the foreign matter from flowing between the rotor and the base plate. The method according to claim 6,
The circuit board is not formed on the cover portion. The method of claim 1,
And the circuit board disposed outside the rotor is fastened by the base plate and a fastening screw.
KR1020110073659A 2011-07-25 2011-07-25 Spindle motor KR20130012438A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110073659A KR20130012438A (en) 2011-07-25 2011-07-25 Spindle motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110073659A KR20130012438A (en) 2011-07-25 2011-07-25 Spindle motor

Publications (1)

Publication Number Publication Date
KR20130012438A true KR20130012438A (en) 2013-02-04

Family

ID=47893137

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110073659A KR20130012438A (en) 2011-07-25 2011-07-25 Spindle motor

Country Status (1)

Country Link
KR (1) KR20130012438A (en)

Similar Documents

Publication Publication Date Title
US8082562B2 (en) Mounting device for disk in spindle motor
US11616424B2 (en) Spindle motor
KR20080097293A (en) Spindle motor
CN102386738B (en) Main shaft motor with rib portion and disc driving device
JP5940319B2 (en) Brushless motor
US8424032B2 (en) Spindle motor having a chucking member
KR101196600B1 (en) Spindle motor
KR20130012438A (en) Spindle motor
KR101245456B1 (en) Spindle motor
KR101761335B1 (en) Spindle motor
KR101884801B1 (en) Spindle motor
KR20130012439A (en) Spindle motor
KR20120082199A (en) Turn table for spindle motor and spindle motor having the same
KR20130073385A (en) Spindle motor
KR101298291B1 (en) Spindle motor
KR101352897B1 (en) Chuking device and spindle motor having the same
US20130106225A1 (en) Spindle motor
KR20130060540A (en) Spindle motor
US20120200201A1 (en) Spindle motor
KR20130044504A (en) Spindle motor
KR20130053736A (en) Spindle motor
KR20130066035A (en) Spindle motor
KR20110137181A (en) Apparatus for rotating disc
KR20130015776A (en) Spindle motor
KR20130021781A (en) Spindle motor

Legal Events

Date Code Title Description
N231 Notification of change of applicant
WITN Withdrawal due to no request for examination