KR20130037889A - Motor and disc driving device of having the same - Google Patents

Motor and disc driving device of having the same Download PDF

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Publication number
KR20130037889A
KR20130037889A KR1020110102403A KR20110102403A KR20130037889A KR 20130037889 A KR20130037889 A KR 20130037889A KR 1020110102403 A KR1020110102403 A KR 1020110102403A KR 20110102403 A KR20110102403 A KR 20110102403A KR 20130037889 A KR20130037889 A KR 20130037889A
Authority
KR
South Korea
Prior art keywords
cover plate
motor
cover
sleeve
coupling portion
Prior art date
Application number
KR1020110102403A
Other languages
Korean (ko)
Inventor
이타경
Original Assignee
삼성전기주식회사
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 삼성전기주식회사 filed Critical 삼성전기주식회사
Priority to KR1020110102403A priority Critical patent/KR20130037889A/en
Publication of KR20130037889A publication Critical patent/KR20130037889A/en

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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
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • 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
    • G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
    • G11B33/027—Covers
    • 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

Abstract

PURPOSE: A motor and a disk operating device including the same are provided to obtain improved coherence by fixing a cover plate in a cover combination unit by using a protrusion formed in the cover combination unit of a sleeve. CONSTITUTION: A sleeve(13) rotatably supports a shaft(11). A cover combination unit(132) of a groove shape is arranged at a lower end of the sleeve. A cover plate(14) is inserted in to the cover combination unit and is fixed at the cover combination unit. A protrusion of the cover combination unit(133) supports a lower surface of the cover plate by being projected from an inner circumference surface of the cover combination unit.

Description

Motor and disc driving device having same {Motor and disc driving device of having the same}

The present invention relates to a motor and a disc drive device having the same, and more particularly, to a spindle motor having a cover plate that can be easily coupled to the sleeve and a recording disc drive device having the same.

A hard disk drive (HDD), which is one of information storage devices, is a device that reproduces data stored on a disk using a read / write head or records data on a disk.

Such a hard disk drive requires a disk drive capable of driving a disk, and a small spindle motor is used for the disk drive.

Recently, the spindle motor has been used a fluid dynamic bearing assembly. The fluid dynamic bearing assembly utilizes a lubricating fluid interposed between the shaft and the sleeve and supports the shaft using the fluid pressure generated by the lubricating fluid during rotation.

By the way, the hydrodynamic bearing assembly is composed of a plurality of parts, so that a gap may be formed when the plurality of parts are combined. As a result, the lubricating fluid may leak into the gap formed between the parts, which causes a problem in the operation of the spindle motor.

On the other hand, in the conventional hydrodynamic bearing assembly, a cover plate is installed at the lower end of the sleeve to prevent the lubricating fluid from leaking to the lower portion of the sleeve. In addition, the sleeve and the cover plate are joined by welding or adhesive to prevent the lubricating fluid from leaking into the gap formed in the portion where the cover plate and the sleeve are joined.

By the way, when an impact is applied from the outside, the sleeve and the cover plate are separated or the adhered portion is separated, and the lubricating fluid leaks to the outside. Therefore, there is a need for a technology development that can improve the impact resistance and bonding strength of the cover plate and the sleeve.

An object of the present invention is to provide a motor and a disc drive device having the same, which can be easily coupled to the cover plate and the sleeve at the same time, and secure the coupling force.

Motor according to an embodiment of the present invention rotatably supports the shaft, the sleeve is provided with a cover coupling portion of the groove shape at the bottom; And a cover plate inserted into and fixed to the cover coupling portion, wherein the cover coupling portion may protrude from an inner circumferential surface of the cover coupling portion to form a locking protrusion supporting the lower surface of the cover plate.

In the present embodiment, the sleeve has a side wall portion protruding axially downward along the outer circumferential surface of the sleeve at the bottom of the sleeve, the cover coupling portion may be a space formed by the side wall portion.

In the present embodiment, the coupling protrusion may be formed to protrude continuously from the inner circumferential surface of the side wall portion toward the inner diameter direction.

In the present embodiment, the coupling protrusion may be formed by discontinuously projecting a plurality of protrusions from the inner circumferential surface of the side wall portion toward the inner diameter direction.

In the present embodiment, the cover plate, the diameter is smaller than the inner diameter of the cover coupling portion, it may be manufactured larger than the inner diameter formed by the engaging projection.

In the present embodiment, the cover plate may be manufactured smaller in diameter than the inner diameter formed by the locking protrusion.

In the present embodiment, the cover plate is supported by the cover plate, the lower surface is pressed in the axial direction upward by the external force, the diameter is plastically deformed to equal to the inner diameter of the cover coupling portion to the cover coupling portion Can be combined.

In the present embodiment, the cover plate may be joined to the cover coupling portion by welding or bonding in a state where the lower surface is supported by the locking protrusion.

In addition, the disk drive apparatus according to an embodiment of the present invention is any one of the above motor; A head conveying unit for transferring a head for detecting information of a recording disk mounted in the motor to the recording disk; And a housing accommodating the motor and the head transfer part.

In the motor according to the present invention, the cover plate may be fixedly fastened to the cover coupling portion by a locking protrusion formed on the cover coupling portion of the sleeve. Therefore, as compared with the case where the cover plate is fastened to the sleeve only by welding or an adhesive as in the related art, it is possible to ensure more bonding force.

In addition, the cover plate is supported and fixed by the locking projection. Therefore, even if the cover plate and the cover receiving portion are bonded or welded to secure additional bonding force, since the cover plate is already fastened to the cover receiving portion, the bonding or welding process can be easily performed.

In addition, even when an impact is applied to the motor from the outside and the welded part or the adhesive is broken or dropped, the cover plate is continuously and firmly supported by the locking projection. As described above, the motor according to the present invention is configured such that the cover plate is fixedly fastened to the cover coupling multiple, and thus, the lubricating fluid can be effectively prevented from leaking to the outside.

1 is a schematic cross-sectional view showing a motor according to an embodiment of the present invention.
FIG. 2A is an enlarged cross-sectional view of a portion A of FIG. 1.
FIG. 2B is an enlarged cross-sectional view of the cover plate of FIG. 2A;
3 is a sectional view schematically showing a cover plate according to the present embodiment.
4A to 4C are views for explaining a process in which the cover plate according to the present embodiment is fastened to the cover coupling part;
5 is a schematic cross-sectional view showing a sleeve according to another embodiment of the present invention.
6 is a schematic cross-sectional view showing a recording disk drive device according to an embodiment of the present invention.

Prior to the detailed description of the present invention, the terms or words used in the present specification and claims should not be construed as limited to ordinary or preliminary meaning, and the inventor may designate his own invention in the best way It should be construed in accordance with the technical idea of the present invention based on the principle that it can be appropriately defined as a concept of a term to describe it. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, it should be noted that like elements are denoted by like reference numerals as much as possible. Further, the detailed description of known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some of the elements in the accompanying drawings are exaggerated, omitted, or schematically shown, and the size of each element does not entirely reflect the actual size.

On the other hand, when defining terms for the direction, the axial direction refers to the up and down direction with respect to the shaft 11 with reference to Figure 1, the outer or inner diameter direction is the outer end of the rotor 40 relative to the shaft 11 The direction toward or toward the center of the shaft 11 with respect to the outer end of the rotor 40 means.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic cross-sectional view showing a motor according to an embodiment of the present invention, Figure 2a is a partially enlarged cross-sectional view showing an enlarged portion A of Figure 1, Figure 2b is an enlarged view without the cover plate in Figure 2a It is a cross section.

1 to 2B, the motor 100 according to the present embodiment is a compact spindle motor 100 used in a hard disk drive (HDD), and a bearing assembly 10 and a base ( 50), a circuit board 60, a stator 30, and a rotor 40.

The bearing assembly 10 may include a shaft 11, a sleeve 13 supporting the shaft 11, and a cover plate 14 supporting the shaft 11 and the sleeve 13.

The shaft 11 forms a rotation axis of the rotor 40 described later. That is, the upper end is fastened to the rotor case 44 and rotates together with the rotor case 44.

The sleeve 13 is a rotation supporting member for inserting the shaft 11 into a hole formed therein and supporting the shaft 11 through lubricating fluid injected between the shaft 11 and the shaft 11.

In addition, as shown in FIG. 2, a cover coupling part 132 to which a cover plate 14 to be described later is inserted and fastened is provided at a lower end or a bottom of the sleeve 13.

More specifically, the bottom surface of the sleeve 13 is formed with a side wall portion 131 protruding axially downward along the outer circumferential surface of the sleeve 13, the inner space of the side wall portion 131 is a cover coupling portion ( 132).

In addition, the locking projection 133 is formed on the inner circumferential surface of the side wall portion 131 to protrude in the inner diameter direction. The catching protrusion 133 may be formed to protrude continuously along the inner circumferential surface of the side wall portion 131.

However, the present invention is not limited thereto, and various applications are possible, such as forming a locking protrusion such that a plurality of protrusions are discontinuously protruded as in other embodiments described below.

When the cover plate 14 is coupled to the cover coupling part 132, the locking protrusion 133 contacts the lower surface of the cover plate 14 to support the cover plate 14.

The cover plate 14 is disposed under the shaft 11 and the sleeve 13, and supports the shaft 11. As described above, the cover plate 14 according to the present embodiment is inserted into the cover coupling portion 132 of the sleeve 13 and fixedly fastened to the sleeve 13.

Accordingly, the cover plate 14 seals the lower surface of the sleeve 13, thereby preventing the lubricating fluid filled in the sleeve 13 from leaking to the lower portion of the sleeve 13.

When the cover plate 14 according to the present embodiment is coupled to the cover coupling portion 132, the cover plate 14 may be plastically deformed and fastened to the cover coupling portion 132. This will be described later.

The base 50 is a support that entirely supports the other components of the motor 100. The base 50 may include a plate portion 51 forming a bottom surface of the motor, and a sleeve support portion 52 protruding in a cylindrical shape in which a through hole is formed in the plate portion 51.

The aforementioned sleeve 13 may be inserted into and fixed to the through hole formed in the sleeve support part 52, and the circuit board 60 may be fastened to at least one surface of the plate part 51.

The circuit board 60 has a circuit pattern (not shown) formed therein for applying power to the motor 100, and is electrically connected to the winding coil 36 of the rotor 40, which will be described later, to form the winding coil 36. Apply power to the

The circuit board 60 may selectively use various substrates such as a general printed circuit board (PCB) or a flexible circuit board (Flexible PCB) as needed.

The stator 30 is a fixed structure including a core 32 and a winding coil 36 wound around the core 32.

The core 32 according to the present exemplary embodiment is formed by stacking a plurality of iron plates, and extends radially toward the outer diameter direction of the shaft 11 with the shaft 11 as a central axis. The core 32 is press-fitted and fixed to contact the outer circumferential surface of the sleeve support 52 of the base 13.

The winding coil 36 is a coil 36 wound around the core 32 and generates an electromagnetic force when power is applied. The winding coil 36 according to the present embodiment may be electrically connected to the circuit board 60 to receive power from the circuit board 60.

The rotor 40 may include a magnet 42 and a rotor case 44.

The rotor case 44 is formed in a cup shape to accommodate the stator 30 therein, and includes a rotor hub 45 and a magnet coupling part 46.

The rotor hub 45 is fixedly fastened by its center to the upper end of the shaft 11 and configured to rotate together with the shaft 11.

Magnet coupling portion 46 is a magnet 42 is fastened, is formed along the inner peripheral surface of the rotor case 44. In this case, the magnet 42 is disposed to face the core 32 on which the winding coil 36 is wound. Therefore, when the winding coil 36 is powered, the rotor 40 is rotated by the electromagnetic interaction between the magnet 42 and the winding coil 36. Due to the rotation of the rotor 40, the shaft 11 and the chucking mechanism 48 that are fastened to the rotor case 44 also rotate together.

The magnet 42 is a ring-shaped permanent magnet in which N poles and S poles are alternately magnetized in the circumferential direction to generate a magnetic force of a predetermined strength, and is fastened to the magnet coupling part 46.

Meanwhile, as described above, when the cover plate 14 according to the present embodiment is coupled to the cover coupling portion 132, the cover plate 14 is plastically deformed and fastened to the cover coupling portion 132.

3 is a cross-sectional view schematically showing the cover plate according to the present embodiment, showing the cover plate 14 before being fastened to the cover coupling portion 132.

Referring to FIG. 3, the cover plate 14 according to the present exemplary embodiment may have a diameter D2 formed by an outer circumference smaller than an inner diameter D3 of the cover coupling part 132. In addition, the inner peripheral surface of the locking projection 133 may be formed smaller than the inner diameter (D1) formed.

However, the present invention is not limited thereto, and the cover plate 14 may be formed when the cover plate 14 is primarily inserted into the cover coupling part 132 by slightly larger than the inner diameter D1 formed by the inner circumferential surface of the locking protrusion 133. It may be configured so that the outer circumference is slightly caught in the locking projection (133).

In addition, the cover plate 14 according to the present embodiment may be formed in a tray or a bowl form. That is, the cover plate 14 is bent so that the inner surface 141 of the center side protrudes to one side (for example, the lower side) from the plane formed by the outer circumference, and thus the receiving space S is formed therein. Can be formed.

In this case, the shape in which the inner surface 141 of the cover plate 14 protrudes may protrude in the form of a tray as shown in the drawing. However, the present invention is not limited thereto, and various applications are possible, such as being formed to protrude into a sphere shape.

In addition, the vertical distance T1 (that is, the thickness of the cover plate) from which the inner surface 141 protrudes from the plane formed by the outer circumference of the cover plate 14 is longer than the depth T2 of the cover coupling portion 132. It is also possible. In this case, when the cover plate 14 is first inserted into the cover coupling portion 132, the protruding inner surface 141 of the cover plate 14 is the outside of the cover coupling portion 132, that is, the sleeve 13. It may be combined in the form of some protruding to the outside.

However, the present invention is not limited thereto, and various applications are possible, such as forming the thickness T1 of the cover plate 14 shorter than the depth T2 of the cover coupling part 132 as necessary.

Next, a process of fastening the cover plate 14 according to the present embodiment to the cover coupling part 132 will be described.

4A to 4C are views for explaining a process in which the cover plate according to the present embodiment is fastened to the cover coupling part.

Referring to this, the process of coupling the cover plate 14 to the cover coupling part 132 according to the present embodiment first inserts the cover plate 14 into the cover coupling part 132 as shown in FIG. 4A. This is done. At this time, since the cover plate 14 has a diameter (D2 in FIG. 3) of the outer circumference smaller than the inner diameter D1 formed by the inner circumferential surface of the locking protrusion 133, the cover plate 14 has a cover coupling part 132. Easily inserted into

In addition, according to the thickness of the cover plate 14, a portion where the inner surface 141 of the cover plate protrudes may be partially protruded to the outside of the cover coupling portion 132.

Subsequently, as shown in FIG. 4B, a coupling process of firmly fixing the cover plate 14 to the cover coupling unit 132 using the jig 80 or the like is performed.

The joining process is performed by mounting the sleeve to which the cover plate 14 is coupled to the flat jig 80 or the like, and then pressing the cover plate 14 upward in the axial direction.

In this process, the cover plate 14 has an inner surface 141 is pressed toward the cover coupling portion 132, thereby causing the cover plate 14 is plastically deformed.

More specifically, the cover plate 14 is pushed up by the outer surface of the inner surface 141 to the axial upper portion, whereby the outer periphery of the cover plate 14 is plastically deformed in a form extending in the outer diameter direction .

Accordingly, as shown in FIG. 4C, the diameter of the cover plate 14 expands as a whole and is deformed to be equal to the inner diameter of the cover coupling part 132, whereby the outer periphery of the cover plate 14 is covered. In contact with the inner circumferential surface of the coupling portion 132. The cover plate 14 is firmly in close contact with the cover coupling portion 132 is fastened.

Through this coupling process, when the cover plate 14 is firmly fastened to the cover coupling portion 132, the cover plate 14 and the cover coupling portion 132 are bonded by a separate bonding member 90 to bond strength. It is also possible to secure more.

In this case, an adhesive, solder, or the like may be used as the bonding member 90.

In the motor according to the present embodiment configured as described above, the cover plate may be fixedly fastened to the cover coupling portion by a locking protrusion formed on the cover coupling portion of the sleeve. Therefore, as compared with the case where the cover plate is fastened to the sleeve only by welding or an adhesive as in the related art, it is possible to ensure more bonding force.

In addition, the motor according to the present embodiment is supported and fixed to the cover plate by the locking projection. Therefore, even if the cover plate and the cover receiving portion are bonded or welded to secure additional bonding force, since the cover plate is already fastened to the cover receiving portion, the bonding or welding process can be easily performed.

In addition, even when an impact is applied to the motor from the outside and the welded part or the adhesive is broken or dropped, the cover plate is continuously and firmly supported by the locking projection.

As described above, the motor according to the present exemplary embodiment is configured such that the cover plate is fixedly fastened to the cover coupling part in multiple numbers, thereby effectively preventing the lubricating fluid from leaking to the outside.

On the other hand, the motor according to the present invention described above is not limited to the above-described embodiment, various applications are possible.

5 is a schematic cross-sectional view showing a sleeve according to another embodiment of the present invention.

The motor according to the embodiment described below has a structure similar to that of the motor (100 in FIG. 1) of the above-described embodiment, and has a difference only in the configuration of the cover coupling part 132 formed in the sleeve 13. Therefore, detailed description of the same components will be omitted, and will be described in more detail based on the cover coupling portion 132.

Referring to FIG. 5, the cover engaging portion 132 of the sleeve 13 according to the present exemplary embodiment is not formed by the engaging protrusion 133 continuously protruding from the inner circumferential surface of the side wall portion 131 as in the above-described embodiment. Instead, it is formed in a form in which a plurality of protrusions are discontinuously projected.

As such, when a plurality of locking protrusions 133 are formed, the side wall portion 131 of the sleeve 13 on which the locking protrusions 133 are not formed is relatively thinner than the portion where the locking protrusions 133 are formed. .

Therefore, compared with the above-described embodiment, it is possible to provide a higher elasticity in the outer diameter direction. Thus, there is an advantage that the cover plate 14 can be inserted into the cover coupling portion 132 more easily.

Hereinafter, a lock disc driving apparatus equipped with a motor according to an embodiment of the present invention will be described.

6 is a schematic cross-sectional view showing a recording disk drive device according to an embodiment of the present invention.

Referring to Fig. 6, the recording disk driving apparatus 1 according to the present embodiment is a hard disk driving apparatus, and includes a motor 100, a head feeder 6, and a housing 3.

The motor 100 has the features described in the above-described embodiments and carries a recording disc 2.

The head feeder 6 may have a head 4. The head 4 detects information of the recording disk 2 mounted on the motor 100. Thus, the head conveying section 6 conveys the head 4 to one surface of the recording disk 2 on which necessary information is recorded. This head 4 may be arranged on the support 5 of the head conveying part 6.

The housing 3 forms an inner space for accommodating the motor 100 and the head transfer part 6 and includes a motor cover plate 8 and a top cover 7 for shielding an upper portion of the motor mount plate 8. Can be.

On the other hand, the motor and the disk drive having the same according to the present invention is not limited to the above-described embodiments, various modifications are possible by those skilled in the art within the spirit of the present invention.

For example, in the above-described embodiment, the case where the cover plate is fastened to the cover coupling portion formed under the sleeve has been described as an example. However, the present invention is not limited thereto, and a cover coupling portion is formed on the base plate, and various applications are possible such that the cover plate is fastened to the base plate.

In addition, the present embodiment has been described as an example of the motor provided in the disk drive device, but is not limited to this, if the motor using a hydrodynamic bearing, and having a cover plate for closing the sleeve or the base plate at the bottom of the shaft variously Can be applied.

100 .... motor
10 ..... bearing assembly 11 .... shaft
13 ..... Sleeve
131 ..... side wall 132 ..... cover
133 ...
14 ..... cover plate
30 ..... Stator 32 ..... Core
36 ..... winding coil
40 ..... rotor 42 ..... magnet
44 ..... rotor case
50 ..... base plate
60 ..... circuit board

Claims (9)

A sleeve rotatably supporting the shaft and having a cover coupling portion having a groove shape at a lower end thereof; And
A cover plate inserted and fixed to the cover coupling part;
Including;
The cover coupling part is a motor protruding from the inner circumferential surface of the cover coupling portion is formed with a locking projection for supporting the lower surface of the cover plate.
The method of claim 1, wherein the sleeve,
A side wall portion protruding in an axially downward direction along an outer circumferential surface of the sleeve at a lower end of the sleeve,
The cover coupling portion is a motor formed by the side wall portion.
The method of claim 2, wherein the engaging projection,
And a motor which protrudes continuously from the inner circumferential surface of the side wall portion toward the inner diameter direction.
The method of claim 2, wherein the engaging projection,
The motor is formed by protruding a plurality of protrusions discontinuously in the inner diameter direction from the inner peripheral surface of the side wall portion.
The method of claim 1, wherein the cover plate,
The diameter is smaller than the inner diameter of the cover engaging portion, the motor is produced larger than the inner diameter formed by the engaging projection.
The method of claim 1, wherein the cover plate,
The motor is made smaller in diameter than the inner diameter formed by the engaging projection.
The method of claim 6, wherein the cover plate,
After the lower surface is supported by the cover plate, as the pressure is applied to the upper side in the axial direction by an external force, the diameter is plastically deformed to the same as the inner diameter of the cover coupling portion is coupled to the cover coupling portion.
The method of claim 2, wherein the cover plate,
The motor is fixedly fastened to the cover engaging portion by welding or bonding while the lower surface is supported by the locking projection.
The motor according to any one of claims 1 to 8;
A head conveying unit for transferring a head for detecting information of a recording disk mounted in the motor to the recording disk; And
A housing accommodating the motor and the head transfer portion;
Disk drive device comprising a.
KR1020110102403A 2011-10-07 2011-10-07 Motor and disc driving device of having the same KR20130037889A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110102403A KR20130037889A (en) 2011-10-07 2011-10-07 Motor and disc driving device of having the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110102403A KR20130037889A (en) 2011-10-07 2011-10-07 Motor and disc driving device of having the same

Publications (1)

Publication Number Publication Date
KR20130037889A true KR20130037889A (en) 2013-04-17

Family

ID=48438723

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110102403A KR20130037889A (en) 2011-10-07 2011-10-07 Motor and disc driving device of having the same

Country Status (1)

Country Link
KR (1) KR20130037889A (en)

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