[go: up one dir, main page]

WO2002073774A1 - Structure etanche a l'air d'un dispositif electronique - Google Patents

Structure etanche a l'air d'un dispositif electronique Download PDF

Info

Publication number
WO2002073774A1
WO2002073774A1 PCT/JP2001/001965 JP0101965W WO02073774A1 WO 2002073774 A1 WO2002073774 A1 WO 2002073774A1 JP 0101965 W JP0101965 W JP 0101965W WO 02073774 A1 WO02073774 A1 WO 02073774A1
Authority
WO
WIPO (PCT)
Prior art keywords
hole
base
stator yoke
electronic device
diameter
Prior art date
Application number
PCT/JP2001/001965
Other languages
English (en)
Japanese (ja)
Inventor
Keiichi Miyajima
Original Assignee
Fujitsu Limited
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 Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP2001/001965 priority Critical patent/WO2002073774A1/fr
Publication of WO2002073774A1 publication Critical patent/WO2002073774A1/fr

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
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers

Definitions

  • the present invention relates to an airtight structure of an electronic device, and in particular, inserts a stator yoke of a spindle motor into a hole formed in a base of a housing, and engages a periphery of the stator yoke with a periphery of a hole of the base.
  • the present invention relates to an airtight structure of a magnetic disk device in which an engaging portion is provided and the engaging portion is hermetically sealed by a seal portion.
  • Electronic devices are designed in consideration of various points such as, for example, arranging related components in close proximity to sufficiently exert the function of the device, or reducing the external dimensions of the device as a whole.
  • Each component is laid out and handled in a form in which each component is housed in a casing having a shape suitable for the layout. In this case, some electronic devices require a high degree of airtightness.
  • the rotating disk 1a is rotated by being urged by a spindle motor (not shown) to record information, and the rotating disk is urged by an actuator 1b.
  • Information is exchanged between the heads 1c floating above 1a, and recording and reproduction are performed.
  • reference numeral 2 indicates a base 2 that forms a housing.
  • the separation between the rotating disk 1a and the head 1c is usually small, on the order of microns. In order to efficiently record and reproduce information on the rotating disk 1a, which is recorded at a higher density, the spacing between the rotating disk 1a and the head 1c must be even smaller than the micron order. Submicron level is required.
  • the airtightness of the magnetic disk drive 1 decreases, and if dust or the like enters the inside of the drive from outside, the flying stability of the head 1c is impaired, and the head 1c and the rotating disk 1 There is a possibility that a head crash may occur which is damaged by contact with a.
  • a decrease in the airtightness of the magnetic disk device 1 may cause various problems other than the above-described head crash.
  • a good airtight structure is particularly essential.
  • the hermetic structures of a conventional magnetic disk drive the hermetic structure of the joint (engaging portion) between the spindle motor and the base of the housing will be described.
  • a rotor yoke (motor hub) 3a and a stator yoke (bracket) 3b, which are components of the spindle motor 3, are separately prepared.
  • the stator yoke 3b is formed integrally with the base 2, and the rotor yoke 3a is attached to the stator yoke 3b when assembling the device.
  • FIG. 2 and FIG. 3 used in the following description for convenience of description, the illustration of coils and the like is omitted, and the external shape of each member is indicated by hatching or the like instead of a complete cross-sectional view.
  • the spindle motor 3 is a motor separated from the base 2 in a state where the rotor yoke 3a and the stator yoke 3b, which are the component parts, are integrated. Prepared as a finished part. Then, the stator yoke 3 b is inserted into the hole 4 formed in the base 2, and the periphery 5 of the stator yoke 3 b is engaged with the periphery 6 of the hole 4 of the base 2 to form an engagement portion a. Then, the engagement part a is hermetically sealed by the O-ring 7.
  • the O-ring 7 is positioned on the orbiting step (groove) 8 formed on the peripheral edge 6 of the base 2, and the O-ring 7 is positioned.
  • the parts of the stator yoke 3 b at several places on the outer periphery of the attachment point and the part of the base 2 are fastened by the fastening member 9, and the O-ring 7 is elastically deformed by the pressing force, and the periphery of the stator yoke 3 b
  • the airtightness is achieved by bringing the portion 5 and the peripheral portion 6 of the base 2 into close contact.
  • stator yoke 3b is formed integrally with the base 2, there is no problem with the airtightness at the motor mounting portion.
  • the manufacturing method in which the stator yoke 3b is formed integrally with the base 2 has a disadvantage that the manufacturing cost is higher than the latter motor-separated type.
  • the step portion 8 is formed in the peripheral portion 6 of the hole portion 4 of the base 2, so that the thickness t2 of the base 2 of the step portion 8 is thin. Then, if the load of the spindle motor 3 continues to be applied to the step portion 8 of the base 2 after assembling the device, the step portion 8 may bend downward and the hermeticity of the O-ring 7 may be impaired.
  • the magnetic disk (not shown) to be mounted 1K For example, when the size of the magnetic disk is reduced from 3.5 inches to 2.5 inches, the original thickness t of the portion other than the step portion 8 of the base 2 due to the device design. 1 becomes thinner, for example, from about 2.5 mm to about 1.5 mm, and accordingly, the thickness t 2 of the base 2 of the stepped portion 8 becomes thinner by one layer. Such a problem of airtightness deterioration becomes more remarkable. In this case, it is conceivable that a circumferential groove is formed at a position of the base 2 away from the hole 4 without forming a step 8 at the peripheral edge 6 of the hole 4 of the base 2. Since it is not always easy to insert and install in the orbital groove with high positioning accuracy, sufficient airtightness may not be ensured. Disclosure of the invention
  • the present invention has been made in view of the above problems, and has a stator yoke inserted into a hole formed in a base of a housing, and a peripheral edge of the stator yoke is engaged with a peripheral edge of the hole of the base.
  • An object of the present invention is to provide a good sealing structure of an electronic device in which an engaging portion is provided and the engaging portion is hermetically sealed.
  • the airtight structure of the electronic device of this effort should be
  • the stator yoke of the motor is inserted into the formed hole, and the peripheral portion of the stator yoke is engaged with the peripheral portion of the hole of the base to form an engaging portion.
  • the seal portion is made of an elastic material, and is located at a predetermined distance from the outer periphery of the hole portion, at a peripheral portion of the stator yoke or at a peripheral portion of the base.
  • a peripheral convex portion integrally formed with at least one of the portions, wherein the peripheral convex portion is pressed into contact with a mating member to be engaged and deformed to hermetically seal the engaging portion.
  • the hermetic structure of the electronic device according to the present invention may be configured such that at least one of the stator yoke or the base is separated from the outer periphery of the hole by a predetermined distance in an assembled state.
  • a plurality of through-holes are formed at the position of the peripheral edge of one surface, and a concave or orbital groove-shaped mold is formed at a position corresponding to the through-hole, the through-hole having a large diameter.
  • An elastic material is injected and molded using a lower mold having a tee and an upper mold having a concave cavity in which the diameter of the through hole is also large at a position corresponding to the through hole.
  • peripheral convex portion an insertion portion connected to the peripheral convex portion and penetrating the through hole portion, and a dimension larger than the diameter of the through hole portion connected to the penetrating portion, And a convex or circumferentially projecting locking portion protrudingly provided on the surface on the opposite side to the above.
  • the locking portion may be formed in the same shape as the orbital convex portion, and the diameter of the through-hole portion may be formed in a plurality of protrusions provided with slightly larger dimensions.
  • the orbiting convex portion can be reliably formed integrally with the stator yoke, and can be formed with high positioning accuracy, so that the airtightness can be further improved.
  • the hermetic structure of the electronic device of the present invention is characterized in that a circumferential groove into which the circumferential protrusion is inserted is formed in a mating member to be engaged.
  • a large contact area between the orbiting convex portion and the base can be obtained, and airtightness can be achieved over a long portion of a path through which outside air enters the device. Therefore, the airtightness can be further improved.
  • the airtight structure of the electronic device according to the present invention is such that the electronic device is a magnetic disk device, and the motor is a spindle motor that urges and rotates a disk of the magnetic disk device. Can be suitably performed.
  • FIG. 1 is a schematic perspective view of the magnetic disk drive with a cover removed.
  • FIG. 2 is a sectional view of a conventional base-integrated magnetic disk drive.
  • FIG. 3 is a sectional view of a conventional base-separated magnetic disk drive.
  • FIG. 5 is a sectional view of the spindle motor and the base of the magnetic disk device of the present invention, taken along line VV in FIG.
  • FIG. 6 is a plan view showing only the upper part of the flange part of the stator yoke of the magnetic disk drive of the present invention.
  • FIG. 7 is a view for explaining a molding method by injecting an elastic material into the stator yoke of the present invention, and a cross section of the upper portion of the flange portion of FIG. 6 on the line VII-VII is arranged in a mold. It is a fragmentary sectional view showing a state.
  • FIG. 8 is a partial perspective view showing only the elastic members formed by the molding method of the present invention.
  • FIG. 9 is a perspective view of a spindle motor for explaining a method of attaching the spindle motor of the present invention to a base.
  • FIG. 10 is a sectional view showing a modification of the elastic member of the present invention.
  • FIG. 11 is a sectional view showing another modification of the elastic member of the present invention.
  • FIG. 13 is a partial cross-sectional view of a spindle motor and a base for explaining a first modification of the present invention.
  • FIG. 14 shows a spindle motor and a base for explaining a second modification of the present invention. It is a fragmentary sectional view of a case.
  • FIG. 15 is a partial sectional view of a spindle motor and a base for explaining a third modification of the present invention.
  • FIG. 16 is a partial sectional view of a spindle motor and a base for explaining a fourth modification of the present invention.
  • FIGS. 4 to 10 taking an airtight structure of a magnetic disk device as an example.
  • the configuration of the main part of the magnetic disk drive of the present invention is the same as that of the magnetic disk drive shown in the conventional example, so that illustration and description are omitted.
  • the magnetic disk drive of the present invention belongs to the separated base type described in the conventional example.
  • the spindle motor 10 for rotating the recording disk (disk) 1 a has a stator yoke 12 and a rotor yoke 16.
  • the stator yoke 12 has a cylindrical portion 18, and an upper step portion 20 a and a lower step portion 20 which extend around the lower end of the cylindrical portion 18 in a stepwise manner in a direction orthogonal to the axis of the cylindrical portion 18. b, and a disk-shaped flange portion (peripheral portion) 20 made of b. A plurality of holes (through holes) 44 are formed in the flange portion 20. A plurality of sets of stator cores 22 and coils 24 are attached to the outer periphery of the cylindrical portion 18.
  • the rotor yoke 16 is erected on the bottom 28 and on the periphery of the bottom 28 (in FIG. 5, the rotor yoke is suspended). And a cylindrical portion 32 having a hollow portion 32a penetrating to the bottom portion 28. A plurality of magnets 34 are attached to the inner surface of the outer wall portion 30.
  • a plurality of bearings 36 are disposed inside the cylindrical portion 18 of the stator yoke 1 2, and the cylindrical portion 32 of the rotor yoke 16 is fitted inside the bearing 36, and the stator yoke 1 and the rotor yoke 1 are provided.
  • 6 is an integrated spindle motor.
  • the base 14, which forms a housing together with a lid (not shown) of the magnetic disk device, has a penetrating hole 38 formed therein, and the peripheral portion A of the hole 38 has an upper step 14 a and a lower step 14. and b.
  • a circumferential groove portion 40 is formed in the lower portion 14b at a predetermined distance D2 that is the same as the predetermined distance D1 from the outer periphery of the hole 38.
  • a plurality of female screw-shaped holes 42 penetrating therethrough are formed at equal intervals in the circumferential direction outside the orbiting groove 40.
  • the orbital convex portion 26 is inserted into the orbital groove portion 40, the male screw 46 is inserted into the hole portion 42, and the stator yoke 12 is attached to the base 14 by screwing into the hole portion 4. Fixed.
  • the orbital protrusion 26 is elastically deformed according to the shape of the orbital groove 26 by the tightening force of the screw, and adheres to the base 14 (see FIG. 12).
  • FIG. 6 shows a plan view of the upper portion 20a of the flange portion 20 with other parts omitted
  • Fig. 7 shows a cross-sectional view of a state in which the flange portion 20 is arranged in a mold to form an elastic member.
  • FIG. 8 is a perspective view showing only the molded elastic member
  • FIG. 9 is a perspective view showing the stator yoke 12 and the base 14 for explaining how to attach the stator yoke 12 to the base 14.
  • the elastic member in which the orbital protrusion 26 having a semicircular cross-section and the engaging portion 60 having the same orbital shape are connected by a shaft portion (through portion) 62 which passes through the hole 50. 64 are formed integrally with the upper portion 20a.
  • the orbital convex portion 26 be shaped so that the contact area with the base 14 can be as large as possible when pressed and deformed.
  • the diamond (diamond) shown in FIG. 10 is also suitable.
  • the locking portion 60 may be a convex shape as shown in FIG. 11 using an upper die having a concave cavity.
  • the hermetic structure of the magnetic disk drive of the present invention configured as described above does not have the circular step 8 around the hole 4 unlike the conventional example in the lower part 14 b of the base 14.
  • the lower peripheral portion 14b has the same thickness as the other portions without reducing the thickness of the peripheral portion on the center side, so that the engaging portion between the base 14 and the stator 12 of the spindle motor 10 is formed. A good airtight structure of A can be obtained.
  • the orbital convex portion 26 is formed integrally with the flange portion 20 of the stator yoke 12 by a molding method, the positioning of the orbital portion 26 is performed. Accuracy is good and airtightness can be ensured.
  • the orbital convex portion 26 is elastically deformed and closely adheres to the orbital groove portion 40. Therefore, the contact area between the orbital protrusion 26 and the base 14 can be increased, and the air can be airtight over a long part of the path (L 1 + L 2 + L 3) into which the outside air enters the device. .
  • the first modified example shown in FIG. 13 has substantially the same structure as the hermetic structure of the magnetic disk drive of the present invention, except that the lower groove 14b is not formed in the lower portion 14b of the base 14, and The difference from the hermetic structure of the magnetic disk drive of the present invention is that the entire surface of the step portion 14b is formed flat.
  • the processing of the base 14 is simple because the orbital groove is not formed in the lower portion 14 b of the base 14, and the central side peripheral portion of the lower portion 14 b Deflection is more reliably prevented.
  • the second modified example shown in FIG. 14 is a modification of the first modified example shown in FIG.
  • the orbital protrusion 26 is formed on the lower portion 14 b of the base 14.
  • the second modification can provide the same effect as the first modification.
  • the members forming the circumferential convex portion and the circumferential groove portion of the hermetic structure of the magnetic disk device of the present invention are arranged in reverse.
  • the orbital protrusion 26 is formed in the lower portion 14 b of the base 14, and the orbital groove 40 is formed in the upper portion 20 a of the stator 12.
  • the third modification can provide the same effect as the hermetic structure of the magnetic disk drive of the present invention.
  • the orbital protrusion 26 is provided on the lower part 14 b and the base 14 of the base 14 and the upper part 20 a of the stator yoke 12 and the orbital groove is formed. I haven't.
  • the fourth modification can achieve more airtightness than the first modification.
  • the fifth modification shown in FIG. 17 corresponds to the lower projections 14 b of the base 14 and the upper projection of the stator yoke 12 corresponding to the two orbiting projections 26 of the fourth modification. 2 0 a Each of them has a circumferential groove 40 formed thereon.
  • the fifth modified example can achieve more airtightness than the fourth modified example.c

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Rotational Drive Of Disk (AREA)

Abstract

L'invention concerne une structure étanche à l'air d'un dispositif électronique, capable d'augmenter l'étanchéité à l'air d'un dispositif à disque magnétique faisant partie des dispositifs assemblés par l'insertion d'une bobine de stator de moteur à broche dans une partie de trou formée dans la base d'un coffret qui comprend un moteur (10) muni d'une bobine de stator (12) et d'une bobine de rotor (16). La bobine de stator (12) comprend une partie saillante périphérique (26) faite d'un matériau élastique installé à la surface inférieure de la partie d'étage supérieur (20a) de la partie de bride (20), intégralement avec la partie d'étage supérieur (20a). La base (14) comprend une partie d'étage inférieur (14b) dans laquelle est formée une partie à rainures périphériques (40). La partie d'étage inférieur (20b) de la partie de bride (20) de la bobine de stator (12) est insérée dans la partie de trou (38) de la base (14). La partie d'étage supérieur (20a) de la partie de bride (20) de la bobine de stator (12) est disposée dans la partie d'étage inférieur (14b) de la base (14), la partie saillante périphérique (26) étant insérée dans la partie à rainures périphériques (40), de manière à fixer la bobine de stator (12) à la base (14).
PCT/JP2001/001965 2001-03-13 2001-03-13 Structure etanche a l'air d'un dispositif electronique WO2002073774A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2001/001965 WO2002073774A1 (fr) 2001-03-13 2001-03-13 Structure etanche a l'air d'un dispositif electronique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2001/001965 WO2002073774A1 (fr) 2001-03-13 2001-03-13 Structure etanche a l'air d'un dispositif electronique

Publications (1)

Publication Number Publication Date
WO2002073774A1 true WO2002073774A1 (fr) 2002-09-19

Family

ID=11737118

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2001/001965 WO2002073774A1 (fr) 2001-03-13 2001-03-13 Structure etanche a l'air d'un dispositif electronique

Country Status (1)

Country Link
WO (1) WO2002073774A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0320094U (fr) * 1989-06-30 1991-02-27
US5600514A (en) * 1993-09-24 1997-02-04 Fujitsu Limited Magnetic disk drive including labyrinth seal and magnetic seal
JPH09140089A (ja) * 1995-11-10 1997-05-27 Sony Corp モータ
JP2000069708A (ja) * 1998-08-20 2000-03-03 Nippon Densan Corp スピンドルモータ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0320094U (fr) * 1989-06-30 1991-02-27
US5600514A (en) * 1993-09-24 1997-02-04 Fujitsu Limited Magnetic disk drive including labyrinth seal and magnetic seal
JPH09140089A (ja) * 1995-11-10 1997-05-27 Sony Corp モータ
JP2000069708A (ja) * 1998-08-20 2000-03-03 Nippon Densan Corp スピンドルモータ

Similar Documents

Publication Publication Date Title
US6034841A (en) Disk drive with composite sheet metal and encapsulated plastic base
US6631049B2 (en) Sealed structure for an electronic device
JP4129585B2 (ja) スピンドルモータ
US4577069A (en) Electroacoustical transducer
JPH08204356A (ja) 電子機器筺体の防水構造
CN113306072B (zh) 一种微型离心泵及其制造方法
US7540005B2 (en) Disk drive
HK138093A (en) Encapsulated stepper motor
US4061890A (en) Loudspeaker with single layer rectangular wire voice coil wound on slit metal bobbin with a notch in the adjacent pole plate
WO2002073774A1 (fr) Structure etanche a l'air d'un dispositif electronique
EP0802612B1 (fr) Moteur synchrone de type à poles à griffes
JPS62279587A (ja) 磁気デイスク駆動装置
JPS62279586A (ja) 磁気デイスク駆動装置
JP2947586B2 (ja) スピンドルモータ
JP2730319B2 (ja) 磁気ディスク装置
CN213402615U (zh) 马达
US6429555B1 (en) Spindle motor for a hard disc drive with a combination seal and electrical connector
JPS62222475A (ja) 情報記憶媒体
JPH03260980A (ja) 磁気ディスク装置
US7345847B2 (en) Tape cartridge
JP3352748B2 (ja) 記録用媒体駆動装置
JP3506909B2 (ja) モ−タ及びその組立方法
JP3424688B2 (ja) 記録用媒体駆動装置
CN100373746C (zh) 无刷电动机
JP3512533B2 (ja) ディスク状記録媒体

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

NENP Non-entry into the national phase

Ref country code: JP