JP3980536B2 - Manufacturing method of glass substrate for information recording medium and manufacturing method of information recording medium - Google Patents

Manufacturing method of glass substrate for information recording medium and manufacturing method of information recording medium Download PDF

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JP3980536B2
JP3980536B2 JP2003299683A JP2003299683A JP3980536B2 JP 3980536 B2 JP3980536 B2 JP 3980536B2 JP 2003299683 A JP2003299683 A JP 2003299683A JP 2003299683 A JP2003299683 A JP 2003299683A JP 3980536 B2 JP3980536 B2 JP 3980536B2
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information recording
substrate
recording medium
cutting
glass
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JP2005067949A (en
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文生 小國
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東洋ガラス株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/50Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57Improving the yield, e-g- reduction of reject rates

Description

The present invention mainly relates to a method for manufacturing an information recording medium incorporated in a hard disk, and a method for manufacturing a glass substrate for an information recording medium used for the medium.

  Conventionally, disk-shaped glass is formed by press forming, and after slow cooling, outer periphery processing, inner hole processing, polishing processing, etc. are performed to form a glass substrate, and then a magnetic film is formed on the substrate surface by sputtering to obtain an information recording medium (Patent Document 1). Peripheral processing is performed by scratching the outer periphery of the slightly thick plate-like glass with a diamond cutter and removing the excess outer periphery by grinding, or polishing the outer periphery, or changing the outer shape of the plate-like glass. Polishing is performed directly on the outer periphery after molding with high accuracy. In the inner hole machining, the inner hole is usually cut with a core drill and then polished around the inner hole.

In addition, after forming a cylindrical glass lump with an axial hole in the center, it is sliced and cut into a disk-shaped glass, and outer periphery polishing, inner hole polishing, double-side polishing, etc. are performed on it. Also disclosed is a technique for forming a glass substrate for an information recording medium (Patent Document 2).
Japanese Patent Laid-Open No. 10-236831 JP-A-61-172220

  The method of forming the above disk-shaped glass by press molding is the most common (patent document 1), but in the case of a small substrate of 2 inches or less, the disk-shaped glass having a small diameter is formed by press molding. It is difficult to cope with this. Further, when the inner hole and the outer periphery are cut, there is a problem that a defect called chipping is likely to occur and the yield is poor.

  It is difficult to form an axial hole in the center of the above method for forming a cylindrical glass lump (Patent Document 2) (after forming a cylindrical glass lump with a mandrel, it is difficult to remove the mandrel) ), It is difficult to form a homogeneous cylindrical glass lump (bubbles remain, etc.), and there are problems such as time and cost for slicing, and it is difficult to put it to practical use.

  INDUSTRIAL APPLICABILITY The present invention can stably and accurately manufacture even a small substrate, can minimize chipping at the time of cutting the inner hole and outer periphery, and can efficiently manufacture a glass substrate for an information recording medium. It was made as an issue to do so.

The invention of claim 1 of the present application includes a step of forming a sheet glass, a step of forming a laminated body in which a plurality of the glass sheets are laminated with an adhesive substance, and a core drill from the laminated body. a step of cutting the hole, a step of cutting the outer periphery of the substrate from the laminate, possess and separating each substrate from the substrate stack after cutting, the adhesive material is ice, the laminate In the method of manufacturing a glass substrate for an information recording medium , the step of forming includes: laminating the plate glasses with water interposed therebetween and then cooling the glass plates to freeze the water. is there.

The invention according to claim 2 of the present application is characterized in that, in the manufacturing method according to claim 1 , the step of cutting the inner hole and the outer periphery cuts a plurality of the substrate laminates from one laminate. And a manufacturing method of a glass substrate for an information recording medium.

Invention of Claim 3 of this application is the manufacturing method of Claim 1 or 2, It is a manufacturing method of the glass substrate for information recording media characterized by the step which shape | molds the said sheet glass by press molding. .

The invention of claim 4 of the present application comprises the steps of manufacturing a glass substrate for information recording medium by the manufacturing method of any one of claims 1 to 3, and forming a magnetic film on the surface of the glass substrate for information recording medium. It is the manufacturing method of the information recording medium characterized by having.

By cutting a plurality of board laminate from one stack, even when manufacturing the small-sized substrate, since it is sufficient molding a large sheet glass sufficiently, shaping the sheet glass by press molding Therefore, it is possible to manufacture a substrate easily and at low cost by using equipment for manufacturing a normal size substrate.

  When a substrate laminate is cut from the laminate, a plurality of substrates are cut by a single cutting operation, and the cutting speed can be increased as compared to cutting a single substrate (a laminate is used). This increases the overall thickness and strength) and improves manufacturing efficiency. Further, when cutting the inner hole or the outer periphery, the chipping defect may occur only in the bottom substrate (the chipping occurs immediately before the completion of cutting with the core drill). Defects are significantly reduced, yield and manufacturing efficiency are improved.

If ice is used as the adhesive material, it can be separated by leaving it at room temperature (may be heated), it is free from contamination by the adhesive material, and further has a cooling effect on the tip of the core drill when cutting the inner hole and outer periphery. .

The method for forming the sheet glass is not particularly limited, but it is desirable to form by press molding because a high quality sheet glass can be stably and easily formed. The type of glass used for the glass substrate of the present invention, but are not particularly limited, for example, it is possible to use an alkali-alumino-silicate based glass (R 2 O · Al 2 O 3 · SiO 2) .

When cutting from a single laminate a plurality of board laminate, it is preferable to perform polishing of the surface prior to the step of cutting steps and the bore stacked, the outer periphery. This is because the number of sheets to be polished can be reduced as compared with the case of polishing after cutting, and the manufacturing efficiency can be improved.

When cutting from a single laminate a plurality of board laminate, or is not limited to cut the number of board laminate from one stack. In addition, the planar shape of the plate-like glass can be made into a suitable shape such as a circle or a quadrilateral.

  The number of plate-like glasses forming the laminated body is arbitrary, but may be 10 to 20, for example.

  For example, the glass substrate for information recording medium is formed as an information recording medium by forming a base layer made of a Cr layer, a magnetic film, a protective layer, and a lubricating layer made of Co—Ni—Cr or the like sequentially from the bottom. . Since a method for forming such a magnetic film is well known, description thereof is omitted.

  FIG. 1 is an explanatory diagram of the laminate 2, in which the upper stage is a plan view and the lower stage is a side view. The plate-like glass 1 is obtained by pressing both sides of a press formed into a disk shape having a diameter of 85 to 90 mm and a thickness of 1.3 mm, and processing it to a thickness of 0.6 mm. In addition, after wiping off the water on the outer surface, it is placed in a freezer, and the water between the glass sheets is frozen to form the laminate 2. As shown by dotted lines in the figure, the inner hole cutting and the outer periphery cutting are performed at four locations, and four substrate laminates 3 (diameter 30 mm) are cut out from the laminate 2.

  FIG. 2 is an explanatory diagram of the substrate laminate 3, wherein the upper stage is a plan view and the lower stage is a side view. The substrate laminate 3 is in a state where ten glass substrates 4 for information recording media are laminated. In the figure, reference numeral 5 denotes an inner hole, and 6 denotes an outer periphery. If the substrate laminate 3 is left at room temperature, the ice between the substrates 4 melts and the substrates are separated.

  3 is an explanatory plan view of an apparatus for cutting out the substrate laminate 3 from the laminate 2, FIG. 4 is an explanatory view of cutting an inner hole, and FIG. 5 is an explanatory view of cutting an outer periphery. This apparatus has a turntable 10, a mounting table 11, a core drill 12 for cutting an inner hole, and a core drill 13 for cutting an outer periphery. The turntable 10 has a disk shape and rotates intermittently in the direction of arrow E. Four mounting tables 11 are attached to the turntable 10 at 90 ° intervals so as to be able to rotate. Each mounting table 11 is sequentially moved to positions A, B, C, and D in FIG. 3 as the turntable 10 rotates. I will do it.

  When the mounting table 11 comes to the A position, the laminate 2 taken out from the freezer is supplied onto the mounting table 11. When the mounting table 11 comes to the B position, the inner hole is cut (inner diameter 5 mm). One core drill 12 for cutting an inner hole is provided at the upper part of the B position, and at the time of cutting, the core drill 12 is rotated while rotating to cut the inner hole (FIG. 4). When one inner hole is cut, the mounting table 11 rotates 90 ° in the direction of arrow F, and then the second inner hole is cut. In this way, four inner holes are sequentially cut. When the mounting table 11 comes to the C position, the outer periphery is cut (outer diameter is 30 mm). One core drill 13 for outer periphery cutting is provided in the upper part of the C position, and when cutting, this lowers while rotating and performs outer periphery cutting (FIG. 5). When one outer periphery is cut, the mounting table 11 rotates 90 ° in the direction of arrow G, and then the second outer periphery is cut. In this way, four perimeter cuts are made sequentially. The cutting speed of the inner hole and the outer periphery can be set to, for example, 0.3 mm / second. When the mounting table 11 comes to the D position, the cut out substrate stack 3 and other remaining portions are taken out.

  If the taken-out board | substrate laminated body 3 is left to stand at normal temperature, the ice between each board | substrate will melt | dissolve and each board | substrate will isolate | separate. The glass substrate for information recording medium is further subjected to precision processing such as inner hole polishing and outer periphery polishing, and a magnetic film is further laminated on the surface to form an information recording medium. Such an information recording medium is mainly incorporated in a hard disk.

The apparatus may be configured to provide a plurality of core drills for cutting an inner hole and a core drill for cutting an outer periphery, and simultaneously cut a plurality of inner holes or outer periphery.

3 is an explanatory diagram of a laminated body 2. FIG. It is explanatory drawing of the board | substrate laminated body 3. FIG. FIG. 4 is an explanatory plan view of an apparatus for cutting out a substrate laminate 3 from a laminate 2. It is explanatory drawing of inner-hole cutting | disconnection. It is explanatory drawing of outer periphery cutting | disconnection.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plate glass 2 Laminated body 3 Substrate laminated body 4 Glass substrate for information recording media 5 Inner hole 6 Outer periphery 10 Turntable 11 Mounting table 12 Core drill for cutting inner hole 13 Core drill for cutting outer periphery

Claims (4)

  1.   Forming a sheet glass; forming a laminate in which a plurality of the sheet glasses are laminated with an adhesive substance; cutting a substrate inner hole from the laminate with a core drill; A step of cutting the outer periphery of the substrate from the body, and a step of separating each substrate from the cut substrate laminate, wherein the adhesive substance is ice, and the step of forming the laminate includes the plate-like members. A method for producing a glass substrate for an information recording medium, characterized in that the glass is superposed with water interposed therebetween and then cooled to freeze the water.
  2.   2. The method of manufacturing a glass substrate for an information recording medium according to claim 1, wherein the step of cutting the inner hole and the outer periphery is a step of cutting a plurality of the substrate laminates from one laminate. Production method
  3.   3. The method of manufacturing a glass substrate for an information recording medium according to claim 1 or 2, wherein the step of forming the plate glass is by press molding.
  4. An information recording medium comprising the steps of: manufacturing a glass substrate for an information recording medium by the manufacturing method according to claim 1; and forming a magnetic film on the surface of the glass substrate for the information recording medium. Manufacturing method
JP2003299683A 2003-08-25 2003-08-25 Manufacturing method of glass substrate for information recording medium and manufacturing method of information recording medium Expired - Fee Related JP3980536B2 (en)

Priority Applications (1)

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JP2003299683A JP3980536B2 (en) 2003-08-25 2003-08-25 Manufacturing method of glass substrate for information recording medium and manufacturing method of information recording medium

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Application Number Priority Date Filing Date Title
JP2003299683A JP3980536B2 (en) 2003-08-25 2003-08-25 Manufacturing method of glass substrate for information recording medium and manufacturing method of information recording medium

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JP3980536B2 true JP3980536B2 (en) 2007-09-26

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008130161A (en) * 2006-11-21 2008-06-05 Konica Minolta Opto Inc Manufacturing method of glass substrate for information recording medium and glass substrate for information recording medium
US8453311B2 (en) * 2008-04-29 2013-06-04 Seagate Technology Llc Sheet-stack cutting
JP2010030807A (en) * 2008-07-25 2010-02-12 Furukawa Electric Co Ltd:The Method for producing glass substrate
JP2010086632A (en) * 2008-10-02 2010-04-15 Konica Minolta Opto Inc Method for manufacturing glass substrate for magnetic recording medium

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