WO2019045074A1 - スペーサ及びハードディスクドライブ装置 - Google Patents

スペーサ及びハードディスクドライブ装置 Download PDF

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Publication number
WO2019045074A1
WO2019045074A1 PCT/JP2018/032488 JP2018032488W WO2019045074A1 WO 2019045074 A1 WO2019045074 A1 WO 2019045074A1 JP 2018032488 W JP2018032488 W JP 2018032488W WO 2019045074 A1 WO2019045074 A1 WO 2019045074A1
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WO
WIPO (PCT)
Prior art keywords
spacer
magnetic disk
peripheral end
outer peripheral
face
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2018/032488
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English (en)
French (fr)
Japanese (ja)
Inventor
正夫 高野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoya Corp
Original Assignee
Hoya Corp
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 Hoya Corp filed Critical Hoya Corp
Priority to CN201880033100.0A priority Critical patent/CN110651326B/zh
Priority to PH1/2019/502613A priority patent/PH12019502613B1/en
Priority to US16/634,079 priority patent/US10872635B2/en
Priority to JP2019508271A priority patent/JP6505960B1/ja
Priority to CN202210035499.4A priority patent/CN114388000B/zh
Publication of WO2019045074A1 publication Critical patent/WO2019045074A1/ja
Anticipated expiration legal-status Critical
Priority to US17/111,068 priority patent/US11238895B2/en
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/022—Positioning or locking of single discs
    • G11B17/028—Positioning or locking of single discs of discs rotating during transducing operation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/021—Selecting or spacing of record carriers for introducing the heads
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/0057—Intermediate mediums, i.e. mediums provided with an information structure not specific to the method of reproducing or duplication such as matrixes for mechanical pressing of an information structure ; record carriers having a relief information structure provided with or included in layers not specific for a single reproducing method; apparatus or processes specially adapted for their manufacture
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/038—Centering or locking of a plurality of discs in a single cartridge
    • 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
    • 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

Definitions

  • the present invention relates to a ring-shaped spacer provided in contact with a magnetic disk in a hard disk drive for magnetic recording and a hard disk device using the spacer.
  • HDD devices hard disk drive devices
  • each HDD apparatus is desired to increase the storage capacity as compared to the conventional one.
  • the floating distance of the magnetic head with respect to the magnetic disk is minimized, and many magnetic disks are mounted on the HDD device, but the increase in the storage capacity of the HDD device has not been sufficiently addressed. Therefore, it is conceivable to increase the number of magnetic disks mounted on the HDD device.
  • a ring-shaped spacer is provided between the magnetic disks in the HDD device to separate and hold the magnetic disks.
  • the spacer functions so that the magnetic disks are not in contact with each other, and the magnetic disks are spaced apart at predetermined positions with high accuracy.
  • foreign matter such as fine particles may be generated from the spacer due to the rubbing of the magnetic disk and the spacer due to the contact. In this case, the long-term reliability of the HDD apparatus is easily lost due to the generated particles. Therefore, it is desirable to reduce particulates generated from the interface between the magnetic disk and the spacer.
  • the inner holes of the magnetic disk and the spacer are alternately inserted into the spindle of the HDD and the magnetic disk and the spacer are stacked, and then the magnetic disk and the spacer are in the spindle axial direction. It is pressed down from inside and assembled in the HDD device. Further, the stacked magnetic disks and the spacer are sequentially pulled out from the assembled HDD device in order to remove a predetermined magnetic disk found to be defective in a performance test or the like. At this time, the magnetic disk and the spacer are held by the holding jig of the assembling apparatus, and assembly or removal is performed.
  • the magnetic disk and the spacer are pressed against each other with a strong force in the direction of the spindle axis and are in close contact with each other, so when removing the spacer in close contact with the magnetic disk It may be difficult to grasp and remove the That is, in some cases, it is not possible to peel off the spacer in close contact with the magnetic disk from the magnetic disk (this failure to tear off is simply referred to as failure in removal).
  • failure in removal if the removal of the spacer by the holding jig fails, rubbing occurs between the outer peripheral end face of the spacer and the holding jig, and this rubbing may generate foreign particles such as particles.
  • One aspect of the present invention is a ring-shaped spacer provided in contact with a magnetic disk in a hard disk drive.
  • the surface roughness Rz of the outer peripheral end face of the spacer is 1.5 ⁇ m or more.
  • the surface roughness Rz of the outer peripheral end face is preferably 20 ⁇ m or less.
  • a groove extending along the outer periphery of the spacer is formed on the outer peripheral end face.
  • the skewness of the outer peripheral end face is preferably 1.2 or less.
  • the skewness is more preferably 0.5 or less, still more preferably 0 or less.
  • the spacer is preferably made of glass.
  • a conductive film is formed on at least a main surface of the spacer in contact with the magnetic disk.
  • Another aspect of the present invention is a hard disk drive including the spacer. At this time, it is preferable that the hard disk drive mounts eight or more magnetic disks.
  • FIG. 6 is a cross-sectional view of an essential part for explaining an example of the structure of an HDD apparatus in which the spacer of one embodiment is incorporated.
  • FIG. 1 is an external perspective view of a spacer 1 according to an embodiment
  • FIG. 2 is a view for explaining the arrangement of the spacer 1 and the magnetic disk 5.
  • FIG. 3 is a cross-sectional view of an essential part for explaining an example of the structure of the HDD apparatus in which the spacer 1 is incorporated.
  • the magnetic disk 5 and the spacer 1 are alternately stacked and incorporated into the HDD.
  • a plurality of magnetic disks 5 are inserted into the spindle 14 that is connected to the motor 12 and rotated via the spacer 1 and further fixed by screws via the top clamp 16 thereon. Are attached at predetermined intervals.
  • the spacers 1 and the magnetic disks 5 are alternately disposed so as to be located between two magnetic disks 5, and the gap between the adjacent magnetic disks 5 is maintained at a predetermined distance. Do.
  • the spacer 1 described in the following embodiment is directed to a spacer provided so as to be in contact with the magnetic disk 5 between the two magnetic disks 5, but the spacer targeted by the present invention is the uppermost layer or the uppermost layer. It also includes a spacer in contact with only the lower magnetic disk 5. Depending on the specification of the HDD apparatus, the spacer 1 may not be provided in contact with only the magnetic disk 5 of the uppermost or lowermost layer.
  • the spacer 1 has a ring shape, and includes an outer peripheral end surface 2, an inner peripheral end surface 3, and main surfaces 4 opposed to each other.
  • the inner peripheral end surface 3 is a surface in contact with the spindle 14 and is a wall surface surrounding a hole of an inner diameter slightly larger than the outer diameter of the spindle 14.
  • the main surfaces 4 are two parallel surfaces in contact with the magnetic disk 5.
  • the spacer 1 is in close contact with the magnetic disk 5 and fixes the magnetic disk 5 by the frictional force. Therefore, the higher the surface smoothness, the larger the contact area and the larger the frictional force. From this point, the surface roughness Ra of the main surface 4 is, for example, 1.0 ⁇ m or less.
  • the surface roughness Ra is preferably 0.5 ⁇ m or less.
  • Ra, Rz and skewness described as surface roughness parameters hereinafter conform to JIS B 0601-2001.
  • Ra is arithmetic mean roughness and Rz is maximum height.
  • the surface roughness is calculated, for example, from data measured using a stylus-type surface roughness meter.
  • the stylus used may have a tip radius of curvature of 2 ⁇ m and a conical taper angle of 60 °.
  • measurement length is 80 ⁇ m
  • measurement resolution (pitch) is 0.1 ⁇ m
  • scan speed is 0.1mm / s
  • low pass filter cutoff value (Ls) is 2.5 ⁇ m
  • highpass filter cut The off value (Lc) can be set to 80 ⁇ m.
  • the surface roughness can be accurately evaluated.
  • the stylus scans along the groove, so that the unevenness of the groove may not be evaluated. That is, when a groove extending in one direction is formed on the surface to be measured, the stylus is scanned in a direction perpendicular to the extending direction of the groove.
  • the value of the above-mentioned surface roughness parameter it is possible to measure, for example, five times on the surface of the part to be evaluated, and use the average value of the five obtained values.
  • the outer peripheral end face 2 is an end face not in contact with the magnetic disk 5 and the spindle 14.
  • the surface roughness Rz of the outer peripheral end face 2, that is, the maximum height Rz is 1.5 ⁇ m or more.
  • the surface roughness Rz is preferably 20 ⁇ m or less.
  • the reason why the surface roughness Rz of the outer peripheral end face 2 is 1.5 ⁇ m or more is that the magnetic disk 5 and the spacer 1 are stacked as shown in FIG. 2 and inserted into the spindle 14 of the HDD device 10 to insert the magnetic disk 5 and the spacer This is because when the specific magnetic disk 5 is taken out from the HDD device 10 in which 1 is assembled, the holding jig of the assembling apparatus can easily grasp and take out so as to take out the spacer 1.
  • the gripping jig grips the outer peripheral end face 2 of the spacer 1 and takes it out of the spindle 14, it is difficult to slip. Since the magnetic disk 5 and the spacer 1 are pressed and fixed by the top clamp 16, the spacer 1 is likely to be in close contact with the magnetic disk 5 and a failure in extraction by the holding jig of the assembling apparatus is likely to occur.
  • the surface roughness Rz is less than 1.5 ⁇ m, extraction failures rapidly increase.
  • the surface roughness Rz is more than 20 ⁇ m, there is a high possibility that the surface of the holding jig is scraped by the surface unevenness of the outer peripheral end face 2 when holding the spacer by the holding jig, and foreign matter such as particles is generated.
  • the surface roughness Rz is preferably 20 ⁇ m or less.
  • the surface roughness Rz is more preferably 10 ⁇ m or less in order to further reduce the possibility of the generation of foreign matter such as particles. Further, even if the surface roughness Rz is less than 2.0 ⁇ m and there is no failure in extraction, particles may be generated due to strong friction at the time of extraction. Therefore, Rz is more preferably 2.0 ⁇ m or more.
  • the outer peripheral end face 2 be formed with a groove (line) extending along the outer periphery of the spacer 1.
  • the groove is preferably a groove formed along the circumferential direction on the outer peripheral end surface 2 of the spacer 1. It is more preferable that the groove is formed on the entire surface of the outer peripheral end surface 2. When there is a chamfered surface, the groove may not be formed on the surface of the chamfered surface. Such a groove can increase the frictional force between the holding jig of the assembling apparatus and the outer peripheral end face 2, and hence the extraction failure can be further reduced. Such a groove can be confirmed by a laser type optical microscope, an SEM or the like.
  • the width of the groove is preferably 10 ⁇ m or more in average value from the viewpoint of securing the frictional force so as to prevent the extraction failure.
  • the groove width is preferably 300 ⁇ m or less on average.
  • the average value of the groove width can be roughly calculated from the number of grooves in the range of a predetermined length in the thickness direction of the outer peripheral end face 2.
  • the depth of the grooves is preferably 20 ⁇ m or less on average, and more preferably 10 ⁇ m or less.
  • concave structures may be provided along the circumferential direction for the purpose of preventing the deflection of the magnetic disk 5 at the time of assembling.
  • the depth of this concave structure is generally 100 ⁇ m or more and is clearly larger than the groove (streak), can be easily recognized visually, and is different from the groove (streak).
  • the skewness Sk which is a parameter for determining the shape of the surface unevenness of the outer peripheral end surface 2, is preferably 1.2 or less. If the skewness Sk is more than 1.2, the surface shape is such that sharp protrusions are relatively sparse, so when the spacer 1 is gripped, the sharp protrusions are broken or the surface of the gripping jig is scraped And the possibility of the generation of foreign matter such as particles is increased.
  • the lower limit value of the skewness Sk is not particularly limited, it is, for example, -2. That is, the skewness Sk is more preferably in the range of -2 to +1.2.
  • the skewness Sk is more preferably equal to or less than 0.5, and still more preferably equal to or less than 0, from the viewpoint of reducing the number of sharp projections.
  • the skewness Sk tends to be more than 1.2.
  • the skewness Sk is preferably 1.2 or less.
  • Skewness Sk is a non-dimensional parameter obtained by dividing the root mean square of measurement data of surface roughness by the cube of the root mean square height of measurement data of surface roughness.
  • Skewness Sk is used to evaluate the symmetry of projections and valleys of the surface roughness. It has positive and negative values, and as the positive value of skewness Sk increases, the number of sharp projections increases.
  • the surface shape is shown as the valley shape becomes gentle, and as the negative absolute value of the skewness Sk becomes larger, the valley shape becomes steep, and the surface shape as the gentle protrusion shape increases.
  • the frictional force between the holding jig of the assembling apparatus and the outer peripheral end face 2 is enhanced, the failure of extraction of the spacer 1 is suppressed, and particles etc. Generation of foreign matter can be suppressed.
  • a conductive film such as a metal film is preferably formed on the surface of the spacer 1.
  • the spacer 1 is made of glass, since the spacer 1 is an insulator, static electricity tends to be accumulated on the magnetic disk 5 and the spacer 1.
  • the magnetic disk 5 and the spacer 1 are charged, foreign particles and particles are easily adsorbed.
  • discharge of the accumulated static electricity to the magnetic head may destroy the recording element and the reproducing element of the magnetic head. Therefore, in order to remove the static electricity, it is preferable to form a conductive film on the surface of the magnetic disk 5 in order to provide the spacer 1 with electrical conductivity.
  • the conductive film is formed by an immersion method, an evaporation method, a sputtering method, or the like used for plating such as electroless plating.
  • the component of the conductive film can be, for example, chromium, titanium, tantalum, tungsten, an alloy containing these metals, or a nickel alloy such as NiP (nickel phosphorus) or NiW (nickel tungsten).
  • the nickel alloy is preferably nonmagnetic.
  • the outer peripheral end face 2 and the inner peripheral end face 3 can be conductive, for example, the conductive films on the upper and lower main surfaces 4 It can also be formed only on the end face 3.
  • the conductive film can be omitted since the static electricity that charges the magnetic disk 5 can be released directly through the spacer 1.
  • the thickness of the conductive film may be such that it has electrical conductivity capable of releasing the static electricity to the outside, and is, for example, 0.01 to 10 ⁇ m. Even when such a conductive film is formed on the outer peripheral end face 2, the film thickness is small, so the numerical range of the surface roughness Rz of the conductive film on the outer peripheral end face 2 and the skewness Sk is the above range.
  • Such a spacer 1 is suitable for an HDD apparatus on which eight or more magnetic disks 5 are mounted.
  • the magnetic disk 5 is mounted on the HDD device more than the usual six or eight or more, it is necessary to press the magnetic disk 5 and the spacer 1 more firmly by the top clamp 16 (clamping).
  • the pressing pressure needs to be increased.
  • the adhesion between the spacer 1 assembled to the HDD apparatus and the magnetic disk 5 is increased, so that the removal failure tends to increase when the spacer 1 is removed from the magnetic disk 5.
  • the spacer 1 capable of suppressing the extraction failure is preferable.
  • the spacer 1 according to the embodiment is more preferably used in an HDD apparatus on which nine or more magnetic disks 5 are mounted, and more preferably in an HDD apparatus on which ten or more magnetic disks 5 are mounted. .
  • the spacer 1 can be made of glass, ceramic or metal, but the same material as the substrate used for the magnetic disk 5 is preferably used. If the difference in thermal expansion coefficient between the spacer 1 and the magnetic disk 5 is large, the difference in thermal expansion between the two becomes large when the temperature inside the HDD changes, and the magnetic disk 5 is warped or the fixed position has a radius There is a possibility that the reading error of the recording signal may occur due to the deviation in the direction or the like.
  • the difference in thermal expansion coefficient is, for example, preferably ⁇ (thermal expansion coefficient of material of spacer) / (thermal expansion coefficient of material of magnetic disk substrate) ⁇ within the range of 0.8 to 1.2. And 0.9 to 1.1 are more preferable.
  • the spacer 1 is preferably made of glass.
  • glass substantially equal to the thermal expansion coefficient of the glass substrate of the magnetic disk 5.
  • the material of the glass spacer is not particularly limited, and examples thereof include aluminosilicate glass, soda lime glass, soda aluminosilicate glass, aluminoboronsilicate glass, boron silicate glass, quartz glass, crystallized glass and the like.
  • the spacer 1 is made of amorphous aluminosilicate glass, for example, silicon dioxide (SiO 2 ): 59 to 63 mass%, aluminum oxide (Al 2 O 3 ): 5 to 16 mass%, lithium oxide (Li 2 O) Glass having 2 to 10% by mass, 2 to 12% by mass of sodium oxide (Na 2 O), and 0 to 5% by mass of zirconium oxide (ZrO 2 ) can be used.
  • This glass is suitable for the spacer 1 in terms of high rigidity and low thermal expansion coefficient.
  • Soda lime glass is, for example, SiO 2 : 65 to 75% by mass, Al 2 O 3 : 1 to 6% by mass, CaO: 2 to 7% by mass, Na 2 O: 5 to 17% by mass, ZrO 2 : 0 to 5
  • Amorphous glass whose component is mass% can be used. Since this glass is relatively soft and easy to grind and polish, it is suitable for the spacer 1 in that it is easy to enhance the surface smoothness.
  • the spacer 1 is made of metal, an aluminum-based or titanium-based alloy (including a single substance), stainless steel, or the like can be used.
  • the material of the spacer 1 made of glass is a plate-like glass manufactured by the float method or download method, cut into a ring, a shape obtained by molding molten glass by the press method, a glass tube manufactured by the tube drawing method. It may be sliced by a length or any other method.
  • the spacer 1 made of glass is obtained by grinding and / or polishing the end surface (the outer peripheral end surface or the inner peripheral end surface) or the main surface of the ring-shaped glass thus formed.
  • the method for grinding and / or polishing the end face is not particularly limited, and for example, grinding or polishing can be carried out using a complete grinding wheel containing # 80 to # 1000 diamond abrasive grains.
  • the diamond abrasive can be fixed to the grindstone by metal or resin.
  • the end face may be polished using a polishing brush provided with a hair material such as nylon. Similar to the processing of the end face portion of the glass substrate for a magnetic disk, these end face processings are performed while rotating both the ring-shaped glass which is the work before becoming the spacer 1 and the general-type grindstone and the polishing brush which are tools. It can be implemented by contacting.
  • the circumferential groove described above can be formed on the surface of the end surface by rotating the ring-shaped glass around its central axis.
  • burrs may occur on the ridges of the ridges between the grooves.
  • burrs tend to occur as the large groove is formed to increase the roughness.
  • the burrs provide time for zeroing the pressure of the grinding wheel at the end of machining in grinding with a general-purpose grinding wheel, weaken the pressure, shorten the time for applying the pressure, and soften them in brush grinding. By using a brush or the like, burrs can be suitably removed while maintaining the overall groove shape.
  • the skewness Sk can be controlled by optimizing grinding and polishing while looking at the value of the skewness Sk.
  • chemical polishing may be performed using an etching solution containing hydrofluoric acid or silicofluoric acid.
  • the outer peripheral end face having a desired surface shape can be formed by appropriately combining the grinding method and the grinding method. After the outer peripheral end face 2 and the inner peripheral end face 3 of the spacer 1 are ground and / or polished, the main surface 4 is subsequently ground and / or polished.
  • the dimensions of the spacer 1 may be appropriately changed according to the specification of the HDD to be mounted, but for a nominal 3.5-inch HDD device, the outer diameter (diameter of the outer peripheral end face 2) is, for example, 31 to 33 mm.
  • the inner diameter (diameter of the inner peripheral end face 3) is, for example, 25 mm, and the thickness is, for example, 1 to 4 mm.
  • the end portion on the inner peripheral side or the outer peripheral side of the main surface 4 may be chamfered as appropriate to provide a chamfered surface.
  • Example 1 In order to confirm the effect of the spacer 1 of the embodiment, a spacer in which the surface unevenness of the outer peripheral end face 2 was variously changed was manufactured (Samples 1 to 26). First, an outer peripheral end portion and an inner peripheral end portion of a material obtained by cutting a plate-like glass into a ring shape were ground using a grinding stone to form an outer peripheral end surface 2, an inner peripheral end surface 3, and a chamfered surface . Next, lapping treatment with free abrasive grains containing alumina particles, polishing treatment with free abrasive grains containing ceria particles, and cleaning treatment were performed on the main surface 4.
  • the inner diameter of the produced spacer is 25 mm, the outer diameter is 32 mm, and the thickness is 2 mm.
  • the angle of the chamfered surface was 45 degrees, the radial width of the chamfered surface was 150 ⁇ m, and the specifications of the chamfered surface were all the same.
  • the abrasive grain size of the formed grinding wheel was changed. In Samples 1 to 11 to be described later, a time for zeroing the pressing force of the grinding wheel was provided at the end of the grinding process so that the skewness Sk of the outer peripheral end face was in the range of 0 to -0.5.
  • the skewness Sk was adjusted with the surface roughness Rz of the outer peripheral end face 2 set to 20 ⁇ m, 10 ⁇ m, and 2 ⁇ m.
  • the skewness Sk was adjusted by adjusting the time for zeroing the pressing force for pressing the sample against the mold overall grinding wheel at the end of the grinding process when grinding the sample using the mold overall grinding wheel.
  • the surface roughness Rz at the inner peripheral end face 3 of all the samples was made equal to 5 ⁇ m
  • the surface roughness Ra at the main surface 4 was made to be 0.1 ⁇ m.
  • samples 3 to 26 are examples, and samples 1 and 2 are comparative examples.
  • the spacers of the prepared samples 1 to 11 are incorporated into a test device simulating an HDD apparatus using three magnetic disks and four spacers, and pressed by a top clamp 16 to obtain a magnetic disk. After assembling for 3 minutes, the magnetic disk and the spacer were taken out separately again. Assembly and removal of the magnetic disk and the spacer was performed once. Each operation was performed by holding the outer peripheral end face of the spacer with a holding jig of a test apparatus simulating a predetermined assembling apparatus.
  • the magnetic disk used was formed by forming a magnetic film or the like on a glass substrate for a magnetic disk of nominal 3.5 inches having an outer diameter of 95 mm, an inner diameter of 25 mm and a plate thickness of 0.635 mm. Table 1 below shows the specifications of Rz of the outer peripheral end face of the glass spacer and the evaluation results thereof.
  • the spacers of Samples 12 to 26 were assembled into a test device that simulated an HDD device using eight magnetic disks and nine spacers, and after pressing down with a top clamp to assemble a magnetic disk, it took 30 minutes. After leaving, the magnetic disk and the spacer were separated again. The assembly and removal of the magnetic disk and the spacer were performed as one operation, and the operation was performed by holding the outer peripheral end surface of the spacer with a holding jig of a test device simulating a predetermined assembling device. This work was repeated 10 times.
  • the magnetic disk used was formed by forming a magnetic film or the like on a glass substrate for a magnetic disk of nominal 3.5 inches having an outer diameter of 95 mm, an inner diameter of 25 mm and a plate thickness of 0.635 mm.
  • the main surface of the magnetic disk before and after the start of the 10 operations was scanned with a laser surface defect analyzer to count differences by counting differences.
  • Rank A The index is 100% or less.
  • Rank B The index is more than 100% to 110% or less.
  • Rank C Index is greater than 110% and less than 130%. Even Rank C can be used with no problem in practical use.
  • Table 3 shows specifications of Rz and skewness Sk of the outer peripheral end face of the spacer, and evaluation results thereof.
  • the spacer can be reliably extracted by setting the surface roughness Rz of the outer peripheral end face to 1.5 ⁇ m or more. From Table 2, it can be seen that setting the surface roughness Rz of the outer peripheral end face to 20 ⁇ m or less is preferable from the viewpoint of reducing the number of particles and ensuring the long-term reliability of the HDD device. It is understood from Table 3 that setting the skewness Sk to 1.2 or less is preferable from the viewpoint of reducing the number of particles and securing the long-term reliability of the HDD apparatus. It is also understood that the skewness Sk is more preferably 0 or less.
  • the conductive film was formed by electroless plating.
  • the spacer 1 on which the conductive film was formed was incorporated into the HDD 10 shown in FIG. At this time, for all the magnetic disks 5 and the spacers 1, continuity with the spindle 14 could be confirmed by a tester. That is, by forming the conductive film on the spacer 1, the static electricity is less likely to be accumulated on the magnetic disk 5 and the spacer 1, and an effect such as the adsorption of foreign matter and particles to the magnetic disk 5 and the spacer 1 is reduced. .
  • Reference Signs List 1 spacer 2 outer peripheral end surface 3 inner peripheral end surface 4 main surface 5 magnetic disk 10 hard disk drive device 12 motor 14 spindle 16 top clamp

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  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
PCT/JP2018/032488 2017-08-31 2018-08-31 スペーサ及びハードディスクドライブ装置 Ceased WO2019045074A1 (ja)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CN201880033100.0A CN110651326B (zh) 2017-08-31 2018-08-31 间隔件和硬盘驱动器装置
PH1/2019/502613A PH12019502613B1 (en) 2017-08-31 2018-08-31 Spacer and hard disc drive device
US16/634,079 US10872635B2 (en) 2017-08-31 2018-08-31 Spacer and hard disk drive apparatus
JP2019508271A JP6505960B1 (ja) 2017-08-31 2018-08-31 スペーサ及びハードディスクドライブ装置
CN202210035499.4A CN114388000B (zh) 2017-08-31 2018-08-31 间隔件和硬盘驱动器装置
US17/111,068 US11238895B2 (en) 2017-08-31 2020-12-03 Spacer and hard disk drive apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017167236 2017-08-31
JP2017-167236 2017-08-31

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US16/634,079 A-371-Of-International US10872635B2 (en) 2017-08-31 2018-08-31 Spacer and hard disk drive apparatus
US17/111,068 Continuation US11238895B2 (en) 2017-08-31 2020-12-03 Spacer and hard disk drive apparatus

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WO2019045074A1 true WO2019045074A1 (ja) 2019-03-07

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