WO2002101906A1 - Dispositif de disque magnetique - Google Patents
Dispositif de disque magnetique Download PDFInfo
- Publication number
- WO2002101906A1 WO2002101906A1 PCT/JP2002/005735 JP0205735W WO02101906A1 WO 2002101906 A1 WO2002101906 A1 WO 2002101906A1 JP 0205735 W JP0205735 W JP 0205735W WO 02101906 A1 WO02101906 A1 WO 02101906A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnetic disk
- core
- stay
- magnetic
- disk drive
- Prior art date
Links
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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
- G11B25/04—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
- G11B25/043—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card using rotating discs
-
- 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
Definitions
- the present invention relates to a magnetic disk drive.
- This in-hub motor is a motor that constitutes a magnetic circuit such as a low-speed and a high-speed drive inside the center hub of a spindle that stacks disks, and is currently the most widely used.
- the under-hub motor forms a magnetic circuit of the rotor stay closer to the base than the hub where the disks are stacked.
- this structure employs a shaft-fixed in-hub motor, so that the hub is attached to the shaft fixed to the base via a bearing-bearing.
- the magnets that make up the mouth are placed inside the hub, and the stay is placed on the base.
- a fixed shaft type underhub is provided. Because a motor is used, a hub is placed on a fixed shaft fixed to the base via a bearing, a magnet that forms the rotor is placed below the hub, and a stay is placed on the base. Have been.
- the shaft is the center axis of rotation of the hub, so the base near the shaft must have a certain thickness to withstand the large force applied to the shaft. In addition, a mass that can withstand the force of the rotation of the hub is also required.
- the concave portion is provided farther from the shaft, and it is preferable that the area of the concave portion is smaller as it is closer to the shaft.
- the stay is formed so as to cover the shaft in the above-mentioned conventional technology, if the thickness of the shaft is reduced by lowering the position of the stay to the base side, a circular shape is formed around the shaft. Alternatively, a concave portion must be formed in the base in an annular shape. In other words, in the prior art, no consideration was given to reducing the thickness of the housing while considering the durability of the housing.
- an object of the present invention is to reduce the thickness of a magnetic disk device while improving the durability of a housing.
- a battery In order to perform such an operation, an internal power supply connected to a magnetic head moving motor (VC4) is required, and a battery generally plays the role. For this battery, a large-capacity, large-capacity battery must be selected from the required sequential capacity.
- VC4 magnetic head moving motor
- an object of the present invention is to suppress a decrease in the durability of the housing, reduce the mounting area of the storage device, and make the magnetic disk device thinner and smaller. Disclosure of the invention
- a base that forms at least one surface of a housing, a shaft fixed to the base, a rotor that rotates around a shaft as a rotation axis, and a rotor
- Some have a magnetic disk and a stay that rotates the stay, and the stay is arranged on the surface facing the base.
- the base since the base is not arranged on the base but on the surface facing the base, it is sufficient to cut away the area far from the shaft, and it is possible to secure the necessary thickness for the base near the shaft. ing. That is, by adopting the structure of this aspect, it is possible to reduce the thickness of the magnetic disk device while suppressing the decrease in the durability of the housing.
- the soft magnetic metal plate, the wiring disposed on both surfaces of the soft magnetic metal plate, and the wiring disposed on both surfaces of the soft magnetic metal plate A coil is formed by providing a through hole for conducting the wiring, and configuring the wiring and the through hole in a spiral shape.
- the substrate processing process can be used as it is, so that the stay can be made thinner.
- the adoption of the electronic circuit board manufacturing process allows the electronic board to be formed of the same material as the steel core.
- the magnetic disk drive is formed of the same material, the magnetic disk drive can be made thinner while suppressing the deterioration of the durability of the housing because the collective formation is possible.
- FIG. 1 is a top view of the magnetic disk drive.
- FIG. 2 is a sectional view taken along line A 1 -A 2 of FIG.
- FIG. 3 is a cross-sectional view taken along B1-B2 in FIG.
- FIG. 4 is an enlarged view of a region C in FIG.
- FIG. 5 is a sectional view taken along the line D 1 -D 2 of FIG.
- FIG. 6 is a sectional view taken along line E 1 -E 2 of FIG.
- FIG. 7 is a cross-sectional view of an electronic circuit forming portion of the metal core wiring board.
- Figure 8 is a table of the stay thickness and motor performance.
- the magnetic disk drive mainly consists of a magnetic head positioning mechanism, a magnetic disk, an aluminum housing (cover and base), a connector, a stay, a rotor, and a stay.
- the external dimensions are the same size (43 mm X 36 mm X 3.3 mm) as the compact flash memory type 1 is there.
- Figure 1 shows a top view of the magnetic disk drive with the cover on the top of the case removed.
- a substrate including a stay is adhered to a cover on the upper surface with an adhesive and fixed with screws.
- Reference numeral 100 in FIG. 1 denotes a metal core wiring board 100 using a soft magnetic metal plate as a core material.
- the metal core wiring board 100 has mainly two holes. These holes correspond to the magnetic head positioning mechanism 110 and the magnetic disk rotation center shaft 120.
- the magnetic head positioning mechanism 110 includes a magnetic head positioning mechanism such as an arm 111 having a magnetic head mounted thereon, and the hole 120 has a rotor magnet (permanent magnet) 121 or A magnetic disk 122 is arranged below the wiring board.
- the coil 101 and the wiring are formed in the area other than the hole of the metal core wiring board 100.
- 102 is a screw hole for fixing to the housing 103.
- the magnetic head positioning mechanism 110 is rotatably attached to the fixed shaft 112 via the bearing 113.
- the magnetic head positioning mechanism 110 is equipped with the coil assembly 111 and the magnetic head]. 17 of the position coil motor ( ⁇ C ⁇ ) for positioning the magnetic head 117.
- Head arm assembly 1 1 1 is installed.
- the coil assembly 1 14 is installed between the magnet 1 15 and the yoke 1 16.
- the V C ⁇ of the magnetic head positioning mechanism is composed of the components from 110 to].
- the magnetic disk device on the side opposite to the housing 103 is provided by an internal apple protection cover 104.
- the magnetic disk rotation center shaft 120 which is the rotation center of the magnetic disk, has a rotor magnet 1 21 and a magnetic disk 1 2 2 is attached, and is attached to a bearing 1 24 fixed to the housing 103 via a movable rotary shaft 123.
- the hub is a general term for members 120, 121, 123, and 124 that transmit rotation to the magnetic disk.
- a connector 1 () 5 having a plurality of signal pins formed therein for transmitting and receiving an electric signal to and from the outside is arranged.
- a sealing resin is applied to the inside of the housing of the connector, and is heated and cured after the application to close the through-hole formed in the connector. The purpose of this is to prevent dust entering from the outside from adhering to the surface of the magnetic disk, and a magnetic shield thin plate 106 is mounted on the metal core wiring board.
- the stay is adhered to the inside of the force par that overlaps with the magnetic disk in the centrifugal direction of the shaft that is the center of rotation of the ring-shaped permanent magnet.
- a metal core wiring board 100 having a core formed by laminating soft magnetic metal plates is adhered to a cover on the upper part of the housing, so that it is substantially a member on the upper surface of the housing. ing. Therefore, the strength of the upper surface of the housing can be improved, and the shock resistance of the entire magnetic disk device has also been improved, so that the entire device can be made thinner. '
- the entire magnetic disk device can be realized as a thin small magnetic disk device while improving the durability against shocks. .
- a connector with a plurality of signal pins for transmitting and receiving electric signals to and from the outside is arranged.Dust entering from the outside of the connector housing has dust entering the surface of the magnetic disk.
- a thermosetting sealing resin is applied so as not to adhere, and the through holes for physical and electrical coupling with the terminal pins formed by application and heat curing are closed.
- An annular rotor magnet (permanent magnet), which is magnetized by being divided into 16 poles in the circumferential direction provided on the outer periphery of the rotor, is mounted on the outside of the rotor magnet through a radial gap.
- the tip 107 is arranged.
- the magnetic pole 1 108 is 24 poles, 1.5 times the number of poles of the ring-shaped permanent magnet, and is between the magnetic pole tip 107 and the magnet 1.
- the mouth rotates due to the magnetic force of. '
- FIG. 4 shows a coil formed by the method for manufacturing a wiring board.
- the magnetic poles 108 made of a silicon iron core are insulated from the magnetic poles 108 made of a silicon iron core by an organic insulating material 131, and a copper thin metal plate is etched thereon to form a number of strip-shaped wirings.
- This wiring layer 132 becomes part of the stay coil.
- FIG. 5 is a cross-sectional view taken along a line D 1 -D 2 in FIG.
- the periphery of the magnetic pole is covered with organic insulating material 13 1.
- a through hole is formed in each of the organic insulating material portions, which penetrates the surface of the organic insulating material. This is connected to the front and back 4: book wiring layers 1 3 2 and 1 3 4 so as to form a double spiral, and then connected in the direction of the center axis E 1—E 2 of the magnetic poles in FIG. By going, it becomes a stator coil.
- the stay magnetic pole has a coil forming portion and a steer pole tip portion 107 where no coil is formed.
- the tip of the stay magnetic pole 107 which is the core of the stay magnetic pole, consists of three layers of adhesive insulation layers 109 and four stay magnetic poles, which are soft magnetic metal plates, alternately. It is composed of a total of seven layers of cores.
- the coil forming part is composed of a double-wound coil, so that four layers of front and back layers of wiring layers 13 2 and 13 4 and adhesive insulating material 13 1 are formed on the front and back of the soft magnetic metal plate core layer of the stay magnetic pole. And a coil layer.
- the end face of the magnetic pole tip 107 on the rotor permanent magnet 122 side is covered with an organic insulating layer 109 for protecting the silicon core material.
- the thickness of the stay is the minimum value due to the current value required by the spindle motor to rotate the rotating body including the magnetic disk and the rotor, which are placed via an air gear, with the magnetic head at a constant speed. Is determined.
- the number of poles per step is 24, the thickness of the silicon iron is 0.1 mm, the thickness is 4 sheets, the metal wiring layer thickness of the coil is 40 ⁇ , and the insulation layer is 35 ⁇ . Overnight thickness is 0.7 mm, stay coil length is 1
- the number of turns per pole was set to 40 turns over 6 ⁇ m.
- the torque constant of the magnet was measured with a magnet of 16 poles, an outer diameter of 13.2 mm, and a thickness of 0.7 mm. (Newton meters).
- the DC resistance of the stay coil was about 6 ⁇ .
- the steady-state rotation torque of this spindle motor was about 0.000111 Nm. Therefore, this spindle motor operates with a steady current of about 60 mA.
- K t A xWb x N x N s (1)
- A is a constant
- Wb is the magnetic flux density between the rotor and the stator
- N is the number of coil turns per stator pole
- Ns is the number of magnetic poles per motor phase.
- the saturation current is about 0.62.
- the current during steady rotation is 60 mA within the range where the magnetic poles do not saturate, and it is equivalent to the example of 0.7 mm thickness, but the maximum torque is about 60%. Even in this case, it can be used as a spindle motor, and according to the present embodiment, it can be seen that a thin motor can be constructed by a metal core wiring board thicker than 0.35 mm.
- the limit on the side where the thickness of the stay is large depends on the technology of forming conductive wiring by through-holes through the front and back of the coil forming the magnetic pole.
- a through-hole of 0.11 mm (aspect ratio 10) was opened for a 1.1-mm-thick layered core, and conductive plating was formed on the inner wall. Variations in plating thickness occurred. This affects the variation in the DC resistance of the coil, which affects the characteristics and manufacturing yield.
- plating can be stably performed on the inner surface of the through-hole with a large aspect, it will be possible to achieve a plating thickness exceeding 1.1 mm. Use of the core is also possible.
- the 1.4 mm thick steel core having a thickness of 1.1 mm and the wiring layer 0.3111111 has the same thickness as that of a thin module using a metal core wiring board. It turns out that this is the upper limit.
- two sets of 0.8 mm thick magnetic head 'arms and assemblies, one 0.4 mm thick magnetic disk, and a 7 mm thick metal core substrate are used.
- a magnetic disk drive having external dimensions of 42.8 mm in width, 36.4 mm in depth, and 3.3 mm in thickness was constructed.
- a magnetic disk drive with a thickness of 2.5 mm to 4.0 mm can be realized by using a single magnetic head, arm, and sampler and selecting the thickness of the metal core substrate based on the characteristics of the module. Is possible.
- the outer dimensions are 21.5 mm in width, 50.0 mm in depth, 50.0 mm in thickness, and 2.8 mm in thickness by using one magnetic head arm's atsampli and a magnetic disk diameter of about 0.7 inch.
- a certain magnetic disk device can be used.
- FIG. 7 is a cross-sectional view of an electronic circuit forming portion of the metal core wiring board.
- copper plating 1414 is formed on the surface. I do.
- a through connection part 147 that penetrates and connects the front and back of the metal core wiring board is formed, and the wiring density is increased.
- An electronic component 148 is mounted on the wiring board 100, and is electrically connected using a solder 149 or a connection method using gold wires not shown in this drawing.
- a hole is formed in the entire soft magnetic metal plate core layer, an insulating material is filled in this hole, a hole is formed through the front and back, and a wiring material is placed on the inner wall of this hole. Then, it is formed and made conductive.
- This forming method is the same for the coil formation of the stay magnetic pole and the electronic circuit forming portion. As described above, since the same layer structure is adopted for the electronic substrate portion and the stay portion portion, they can be manufactured as the same substrate. In addition, when the layers are made uniform on the same substrate, the electronic substrate portion and the stay portion can be manufactured simultaneously in one manufacturing process by making the thickness of the layers uniform.
- silicon iron having a saturation magnetic flux density of about 1.5% was used as the soft magnetic core sheet material. It is possible to further reduce the thickness.
- the present invention is useful as it relates to a magnetic disk drive.
Landscapes
- Rotational Drive Of Disk (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020027011435A KR100562809B1 (ko) | 2001-06-11 | 2002-06-10 | 자기 디스크 드라이브 |
US10/220,371 US7035044B2 (en) | 2001-06-11 | 2002-06-10 | Magnetic disk device having a low-profile motor without deterioration in the strength of the enclosure |
EP02733439A EP1434334B1 (en) | 2001-06-11 | 2002-06-10 | Magnetic disk device |
DE60213833T DE60213833T2 (de) | 2001-06-11 | 2002-06-10 | Magnetplatteneinrichtung |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001174990 | 2001-06-11 | ||
JP2001-174990 | 2001-06-11 | ||
JP2002164562A JP4031953B2 (ja) | 2001-06-11 | 2002-06-05 | 磁気ディスク装置 |
JP2002-164562 | 2002-06-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002101906A1 true WO2002101906A1 (fr) | 2002-12-19 |
Family
ID=26616662
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/005735 WO2002101906A1 (fr) | 2001-06-11 | 2002-06-10 | Dispositif de disque magnetique |
Country Status (8)
Country | Link |
---|---|
US (1) | US7035044B2 (ja) |
EP (1) | EP1434334B1 (ja) |
JP (1) | JP4031953B2 (ja) |
KR (1) | KR100562809B1 (ja) |
CN (1) | CN100448140C (ja) |
DE (1) | DE60213833T2 (ja) |
TW (1) | TWI231474B (ja) |
WO (1) | WO2002101906A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007006634A (ja) | 2005-06-24 | 2007-01-11 | Hitachi Global Storage Technologies Netherlands Bv | ディスク装置及びディスク駆動装置 |
JP5181232B2 (ja) * | 2006-10-26 | 2013-04-10 | セイコーインスツル株式会社 | ステータ、モータ及び記録媒体駆動装置並びにステータの製造方法 |
DE102015013662A1 (de) * | 2015-10-22 | 2017-05-11 | Minebea Co., Ltd. | Elektromotor |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS438771B1 (ja) * | 1963-03-12 | 1968-04-06 | ||
JPS59161373U (ja) * | 1983-04-12 | 1984-10-29 | 松下電器産業株式会社 | 周波数発電機 |
JPH05176507A (ja) * | 1991-12-25 | 1993-07-13 | Sony Corp | 有鉄芯モータ |
JP2000100060A (ja) * | 1998-09-28 | 2000-04-07 | Mitsubishi Electric Corp | ディスク駆動装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS438771Y1 (ja) * | 1966-06-22 | 1968-04-17 | ||
US5822152A (en) * | 1992-05-06 | 1998-10-13 | Maxtor Corporation | Ultra-slim disk storage unit with an enclosed circuit board and a hydrodynamic bearing assembly which forms a stable meniscus |
JP3358667B2 (ja) | 1992-08-19 | 2002-12-24 | 富士通株式会社 | ディスク回転用モータ |
JPH07182771A (ja) | 1993-12-21 | 1995-07-21 | Hitachi Ltd | 光または磁気ディスク装置 |
US5528436A (en) * | 1994-06-03 | 1996-06-18 | Hewlett-Packard Company | Low profile motor powered disk assembly for a recording/reproducing device |
US6208485B1 (en) * | 1995-03-16 | 2001-03-27 | International Business Machines Corporation | Microfile |
US5761000A (en) * | 1995-11-30 | 1998-06-02 | Samsung Electronics Co., Ltd. | Data storage devices having a slim-type hard disk drive suitable for use in portable computers |
US6826018B2 (en) * | 2001-03-06 | 2004-11-30 | Matsushita Electric Industrial Co., Ltd. | Disk drive with head supporting device |
-
2002
- 2002-06-05 JP JP2002164562A patent/JP4031953B2/ja not_active Expired - Fee Related
- 2002-06-10 KR KR1020027011435A patent/KR100562809B1/ko not_active IP Right Cessation
- 2002-06-10 TW TW091112560A patent/TWI231474B/zh not_active IP Right Cessation
- 2002-06-10 DE DE60213833T patent/DE60213833T2/de not_active Expired - Fee Related
- 2002-06-10 WO PCT/JP2002/005735 patent/WO2002101906A1/ja active IP Right Grant
- 2002-06-10 EP EP02733439A patent/EP1434334B1/en not_active Expired - Lifetime
- 2002-06-10 CN CNB028000412A patent/CN100448140C/zh not_active Expired - Fee Related
- 2002-06-10 US US10/220,371 patent/US7035044B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS438771B1 (ja) * | 1963-03-12 | 1968-04-06 | ||
JPS59161373U (ja) * | 1983-04-12 | 1984-10-29 | 松下電器産業株式会社 | 周波数発電機 |
JPH05176507A (ja) * | 1991-12-25 | 1993-07-13 | Sony Corp | 有鉄芯モータ |
JP2000100060A (ja) * | 1998-09-28 | 2000-04-07 | Mitsubishi Electric Corp | ディスク駆動装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1434334A4 * |
Also Published As
Publication number | Publication date |
---|---|
CN100448140C (zh) | 2008-12-31 |
JP4031953B2 (ja) | 2008-01-09 |
TWI231474B (en) | 2005-04-21 |
KR20030039325A (ko) | 2003-05-17 |
DE60213833T2 (de) | 2006-12-14 |
EP1434334A4 (en) | 2005-01-05 |
DE60213833D1 (de) | 2006-09-21 |
KR100562809B1 (ko) | 2006-03-21 |
US7035044B2 (en) | 2006-04-25 |
CN1455979A (zh) | 2003-11-12 |
EP1434334A1 (en) | 2004-06-30 |
US20030227712A1 (en) | 2003-12-11 |
EP1434334B1 (en) | 2006-08-09 |
JP2003079119A (ja) | 2003-03-14 |
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