CN102157167A - Glass blank and manufacture method thereof, magnetic recording medium and substrate for magnetic recording medium - Google Patents
Glass blank and manufacture method thereof, magnetic recording medium and substrate for magnetic recording medium Download PDFInfo
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- CN102157167A CN102157167A CN2010105618318A CN201010561831A CN102157167A CN 102157167 A CN102157167 A CN 102157167A CN 2010105618318 A CN2010105618318 A CN 2010105618318A CN 201010561831 A CN201010561831 A CN 201010561831A CN 102157167 A CN102157167 A CN 102157167A
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Abstract
The invention discloses a glass blank and the manufacture method thereof, a magnetic recording medium and a substrate for magnetic recording medium. The glass blank formed into a sheet glass product comprises a first protruding portion which protrudes out from the edge of a first surface of the glass blank along the normal direction of the first surface; and a second protruding portion which protrudes out from the edge of a second surface of the glass blank along the normal direction of the second surface. The tops of the first and second protruding portions are respectively parallel to the first surface and the second surface, so as to form a first inclined plane extending from the top of the first protruding portion to the first surface, and a second inclined plane extending from the top of the second protruding portion to the second surface.
Description
Technical field
The present invention relates to a kind of chunk glass (glass blank), it is laminal glass molding product.
Background technology
Use chunk glass as the substrate that is used for the high-density recording media such as hard disk, wherein chunk glass is laminal glass molding product.The open No.3714501B (being called as JP3714501B hereinafter) of Jap.P. discloses the example of conventional chunk glass.Fig. 8 has shown the sectional view of conventional chunk glass 201.As shown in Figure 8, chunk glass 201 has the xsect of letter " H " shape.Particularly, chunk glass 201 has first surface 210 and second surface 220, is formed with first outshot 211 and second outshot 221 respectively in the edge of first surface 210 and second surface 220.Form angle part 212 between the first surface 210 and first outshot 211, form angle part 222 between the second surface 220 and second outshot 221.The angle that conventional chunk glass 201 is configured to each angle part 212 and angle part 222 all is approximately 90 °.By such formation chunk glass, the outshot that can form on chunk glass in process of lapping is accepted the pressure from grinding machine, thereby prevents that process of lapping from carrying out under the state of chunk glass elastic deformation.Therefore, can make the straight substrate of magnetic recording media.
Usually make chunk glass by press.Press is configured to form heating and melting glass blocks (gob), pushes the gob between the upper die and lower die simultaneously and gob cooled off.Particularly, gob is dropped on the counterdie, drive patrix towards counterdie then, thus the gob between the extruding upper die and lower die.
In order to make chunk glass efficiently, be that a patrix prepares a plurality of counterdies.In case chunk glass is extruded, after counterdie is removed patrix, chunk glass is being stayed on the counterdie, and cooling is placed with the counterdie of chunk glass.In order on chunk glass, to form outshot mentioned above, on each upper die and lower die, all be formed with step part.
Summary of the invention
In cooling procedure mentioned above, come the cooled glass blank by natural cooling.In extrusion process, the temperature of patrix is lower than the temperature of counterdie.On the other hand, because extrusion time is short, the temperature of the upper surface of glass is higher than the temperature of the lower surface of glass.Therefore, in cooling procedure, the state of chunk glass is: the temperature slippage in the chunk glass is bigger at the some place of close patrix.As a result of, chunk glass 201 shrinks more serious at upside, therefore as shown in Figure 9, cause warpage in chunk glass 201, makes that the core of chunk glass 201 is outstanding downwards.
At counterdie and the flatness that approximately maintains glass transformation temperature proofread and correct between the patrix chunk glass 201 that has been cooled before the extruding once more, thereby can proofread and correct caused warpage in the chunk glass 201 (flatness is proofreaied and correct extruding).But, caused in chunk glass 201 under the state of warpage that it is unstable that the state that chunk glass 201 is kept by counterdie D becomes.Therefore, may be for example under the outshot 221 of chunk glass 201 overlaps state on the step part D1 of counterdie D, carry out flatness and proofread and correct extruding.As a result of, outshot 211 and outshot 221 are extruded between the step part of upper and lower mould, so the precise decreasing of the flatness of chunk glass.In addition, have such possibility: when the upside of chunk glass shrank in cooling procedure, the inferior horn part 222 of chunk glass 201 was stumbled, and the first surface 210 of chunk glass 201 is out of shape owing to stretching, thus the precise decreasing of the flatness of chunk glass.
The chunk glass manufacture method that the present invention advantageously provides at least a chunk glass and the chunk glass with high-precision flatness can be provided.
According to an aspect of the present invention, provide a kind of chunk glass, it is formed laminal glass molding product, comprising: first outshot, and give prominence to along the normal direction of described first surface its marginal portion that is formed in the first surface of described chunk glass; And second outshot, its marginal portion of second surface that is formed in described chunk glass is outstanding along the normal direction of described second surface.In this configuration, the end face of the end face of described first outshot and described second outshot is roughly parallel to described first surface and described second surface respectively.Formation extends to first inclined-plane of described first surface from the end face of described first outshot, and forms second inclined-plane that extends to described second surface from the end face of described second outshot.
By this configuration, when carrying out flatness correction extruding, the inclined-plane of chunk glass slides on mould.Therefore, proofread and correct in the extrusion process in flatness, chunk glass is extruded under the state that equals the initial molded and shaped original state of chunk glass substantially.As a result of, obtain having the chunk glass of high-precision flatness.
In aspect at least one, each in the angle that forms between the angle that forms between described first inclined-plane and the described first surface and described second inclined-plane and the described second surface can be less than or equal to 30 °.By this configuration, the inclined-plane is easier in flatness correction extrusion process slides on mould.
In aspect at least one, each in the angle part between angle part between described first surface and described first inclined-plane and described second surface and described second inclined-plane can be circular.In aspect at least one, each in the angle part between the angle part between the end face of described first outshot and described first inclined-plane and the end face of described second outshot and described second inclined-plane can be circular.In aspect at least one, each in the angle part between the side of the angle part between the end face of described first outshot and the side of described chunk glass and the end face of described second outshot and described chunk glass can be circular.
In the cooling procedure of chunk glass, have the angle part of protruding shape and have easily the characteristic of heat from wherein taking away, the angle part with concave shape has and is difficult to the characteristic of heat from wherein taking away.Therefore, easily cause big thermal stress, and may cause big thermal deformation in the angle part in the angle part.According to configuration mentioned above, each angle part is circular.Therefore, in the angle part of protruding, heat is difficult to be brought to the outside, and in the angle part of depression, heat is brought to the outside easily.As a result of, can be implemented in the chunk glass that each angle part has the thermal deformation of less degree and has high-precision flatness.
In aspect at least one, the end face of the end face of described first outshot, described second outshot, the part that is centered on described first surface by described first inclined-plane, the part that is centered on described second surface by described second inclined-plane can be flat surfaces, and can be parallel to each other substantially.In addition, each end face of first outshot and second outshot can be in a plane.By such formation chunk glass, can be after compression molding cooled glass blank more equably, thereby can further improve the flatness of chunk glass.Also can easily estimate the flatness of chunk glass.In addition, in the attrition process process that is used for making the substrate of magnetic recording media, can accept abrading glass blank under the pressure status from grinding machine in the whole top of the outshot of chunk glass by chunk glass.Therefore after attrition process, can further improve the flatness of chunk glass, thereby can prevent that outshot from being reamed.
According to a further aspect in the invention, provide a kind of method of making chunk glass, comprising: extrusion process forms chunk glass as laminal glass molding product by the softening glass material of extruding between upper die and lower die.In this configuration, in described extrusion process in the employed upper die and lower die each has straight portion, outer peripheral portion and inclined-plane, described straight portion is a basic horizontal, described outer peripheral portion be formed on described straight portion whole periphery so that the bottom surface of described outer peripheral portion be basic horizontal and with respect to described straight portion depression, described inclined-plane is formed between described straight portion and the described outer peripheral portion.
In aspect at least one, this method may further include cooling procedure, and it is carried out after described extrusion process, under the state that has removed described patrix from described counterdie the chunk glass on the described counterdie is cooled off.
According to a further aspect in the invention, provide a kind of method of making the glass substrate of magnetic recording media, comprising: process chunk glass mentioned above to form discoid substrate.According to a further aspect in the invention, provide a kind of method of making the glass substrate of magnetic recording media, comprising: make chunk glass by method mentioned above; And process described chunk glass to form discoid substrate.
According to a further aspect in the invention, provide a kind of method of making magnetic recording media, comprising: process chunk glass mentioned above to form discoid substrate; And on described substrate, form magnetic recording layer at least.According to a further aspect in the invention, provide a kind of method of making magnetic recording media, comprising: make chunk glass by method mentioned above; The processed glass material is to form discoid substrate; And on described substrate, form magnetic recording layer at least.
By using chunk glass mentioned above to make the substrate of magnetic recording media or, can realizing making the saving of labor of technology substrate or the production process of magnetic recording media from chunk glass by using chunk glass mentioned above to make magnetic recording media.
Description of drawings
Fig. 1 is the sectional view of chunk glass according to an embodiment of the invention.
Fig. 2 has shown the press that is used to make according to the chunk glass of this embodiment, and it is in the state that melten glass is provided to counterdie.
Fig. 3 is the sectional view according to the press of this embodiment, thereby it is in the state that forms molten glass gobs by the cutting melten glass.
Fig. 4 has shown the press that is used to make according to the chunk glass of this embodiment, and it is in the state that patrix is placed on the counterdie.
Fig. 5 is the sectional view according to the press of this embodiment, and it is in the state that pushes between the upper die and lower die.
Fig. 6 is the sectional view according to the press of this embodiment, and it is in the state that on the counterdie chunk glass is cooled off.
Fig. 7 is the sectional view according to the press of this embodiment, and it is in the state that causes warpage in the chunk glass on the counterdie.
Fig. 8 is the sectional view of the chunk glass of routine.
Fig. 9 is the sectional view that is used for the press of conventional chunk glass, and it is in the state that causes warpage in the conventional chunk glass on the counterdie.
Embodiment
Hereinafter, be described with reference to the drawings according to embodiments of the invention.
Fig. 1 is the sectional view of chunk glass 101 according to an embodiment of the invention.As shown in Figure 1, chunk glass 101 is to be shaped as discoid glass molding product, and its diameter is about 66mm, and thickness is about 1mm.
Form annular protruding portion 111 and annular protruding portion 121 respectively at the first surface 110 of chunk glass 101 and the edge of second surface 120.Outshot 111 and outshot 112 are formed outstanding on the normal direction of first surface 110 and second surface 120 respectively.The end face 111a of outshot 111 and the end face 121a of outshot 121 are formed and are basically parallel to first surface 110 and second surface 120 respectively.Outshot 111 and outshot 121 all serve as the pedestal that is used at process of lapping support glass blank 101.In this embodiment, be basically parallel to first surface 110 and second surface 120 respectively, therefore in as the process of lapping of aftertreatment, can firmly keep chunk glass 101 because end face 111a and end face 121a are formed.It should be noted, the lower limit of the height of each in outshot 111 and the outshot 121 (being distance between end face 111a and the first surface 110 and each the lower limit in the distance between end face 121a and the second surface 120) is preferably 0.01mm, 0.02mm more preferably, more preferably 0.03mm is preferably 0.04mm again.The upper limit of the height of each in outshot 111 and the outshot 121 is preferably 0.10mm, 0.09mm more preferably, and more preferably 0.08mm is preferably 0.07mm again.If it is too much that the height of each outshot is set, then in the cooling procedure of carrying out after compression molding, it is big that the cooling velocity of outshot becomes, and therefore is difficult to cooled glass blank equably, thereby reduced the flatness of chunk glass 101.If the height of each outshot is set too smallly, then in process of lapping, be difficult to the pressure of only accepting from grinding machine by outshot 111 and outshot 112.Therefore in this case, chunk glass 101 stands milled processed under the state of chunk glass 101 elastic deformations, is difficult to obtain the advantage of the outshot described in the JP3714501.In order to obtain the advantage of outshot, each outshot makes progress in the footpath of disk-shaped glass blank 101 and is preferably dimensioned to be 0.5mm or higher, 0.8mm or higher more preferably, 1mm or higher more preferably, and be preferably 10mm or lower, more preferably 8mm or lower, more preferably 7mm or lower, be preferably 6mm again, again 5mm more preferably.In this embodiment, the height of each in outshot 111 and the outshot 121 is approximately 0.05mm.
Forming inclined-plane 112 and inclined-plane 122 between first surface 110 and the outshot 111 and between second surface 120 and the outshot 121 respectively.Angle θ 2 between angle θ 1 between first surface 110 and the inclined-plane 112 and second surface 120 and the inclined-plane 122 is equal to each other basically.In the angle part 124 between the end face 121a of angle part 123 between the angle part 114 between the end face 111a of the angle part 113 between first surface 110 and the inclined-plane 112, inclined-plane 112 and outshot 111, second surface 120 and the inclined-plane 122 and inclined-plane 122 and outshot 121 each all is circular.In the angle part 125 between the circumferential surface 130 of chunk glass 101 and the angle part 115 between the outshot 111 and circumferential surface 130 and the outshot 125 each all is circular.In order to obtain the above-mentioned advantage that all is formed circular angle part, the radius-of-curvature of above-mentioned each angle part is preferably 0.05mm or higher, 0.1mm or higher more preferably, and more preferably 0.2mm or higher is preferably 0.3mm or higher again.When radius-of-curvature is set when too much, can't form outshot 111 and outshot 121.Therefore, the external diameter that can be by considering chunk glass 101 and the width of thickness and outshot are determined the upper limit of radius-of-curvature.Should be noted that, with regard to even cooled glass blank and evenly accepting with regard to the pressure from grinding machine in the process of lapping, preferably the outshot 121 of the outshot 111 of first surface 110 and second surface 120 is formed respectively outer peripheral portion around first surface 110 and second surface 120.
Hereinafter, explanation is according to the manufacture process of the chunk glass 101 of this embodiment.Chunk glass 101 is made by press 10.Each figure among Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6 has shown the sectional view of the press 10 in the manufacture process of chunk glass 101.
The press 10 of making chunk glass 101 is configured to extruding gob GG between patrix 11 and counterdie 12, and it is the gob of molten glass material GM.
In order to make chunk glass 101, at first need gob GG is placed on the counterdie 12.Therefore, as shown in Figure 2, mobile counterdie 12 is located at nozzle 13 belows of flowing out molten glass material GM.
As shown in Figure 2, between the exhaust opening 13a of nozzle 13 and counterdie 12, be provided with a pair of cutter (cutter) 14.This is set to switch between first state and second state to cutter 14, in first state, allow glass material GM from this to passing through between the cutter 14, in second state, this is closed cutter 14, thus do not allow glass material GN from this to passing through between the cutter 14.
In Fig. 2, this is in first state to cutter 14, thus the glass material GM that flows out from the exhaust opening 13a of nozzle 13 through this between the cutter 14, drop on simultaneously on the counterdie 12.
As shown in Figure 2, be formed with sunk part 12a on the upper surface of counterdie 12, sunk part 12a has the shape (see figure 1) with second surface 120, outshot 121, inclined-plane 122, circumferential surface 130 and angle part 123 to 125 equities of chunk glass 101.Form the contact portion 12b of contact patrix 11 in the periphery of sunk part 12a.Sunk part 12a is configured to have straight portion 12d and the straight sunk surface 12e of periphery, straight portion 12d is positioned at core and is formed basic horizontal, and periphery is straight, and sunk surface 12e is formed on the outer rim of straight portion 12d and form with respect to straight portion 12d to lower recess.It should be noted that upper die and lower die have been processed to its surface to has with the rounded corners of chunk glass 101 with the corresponding part in the angle part of chunk glass 101 and to divide opposite shape.If can form the round angle part, can in compression molding, the position except that above-mentioned position be the part that the angle part is provided for shifting then by the molded surface that shifts pressing mold
After the glass material GM with scheduled volume placed on the sunk part 12a of counterdie 12, this entered second state to cutter 14.As shown in Figure 3, in second state, glass material GM is cut off cutter 14 by this, forms gob GG.
Next, under gob GG is positioned at state on the sunk part 12a, counterdie 12 is moved to the position of patrix 11 belows.As shown in Figure 4, patrix 11 has cylindrical portions may 11a and piston portion 11b.Driven plunger 11b is vertically to-and-fro movement in cylindrical portions may 11a.When as the surface in contact 12b of the surface in contact 11c contact counterdie 12 of the lower surface of the cylindrical portions may 11a of patrix 11, formation forms the confined space P that part 11e is surrounded by lower surface 11d and the outshot of the piston portion 11b of the sunk part 12a of counterdie 12, patrix 11, and wherein outshot forms the inside of surface of contact 11c that part 11e is formed on the cylindrical portions may 11a of patrix 11.As shown in Figure 4, when the surface in contact 12b of the surface in contact 11c of patrix 11 and counterdie 12 contacted with each other, gob GG was accommodated among the confined space P.
Next, the piston portion 11b of patrix 11 moves down towards counterdie 12.The lower surface 11d of piston portion 11b has the shape identical respectively with the end face 121a of first surface 110, inclined-plane 122 and outshot 121.In addition, form to form on the part 11e at the outshot of the cylindrical portions may 11a of patrix 11 and have with the identical shaped inclined-plane 11e1 in the inclined-plane 112 of chunk glass 101 and have the periphery straight sunk surface 11e2 identical shaped with the end face 111a of outshot 111.Therefore, as shown in Figure 5, under the state that piston portion 11b has moved down, the shape of confined space P is identical with the shape of chunk glass 101.
As shown in Figure 5, when the piston portion 11b of patrix 11 moved down, gob GG formed laminal shape rapidly.At this moment, because the contact area between each in gob GG and patrix 11 and the counterdie 12 spreads rapidly, the heat of gob GG is transferred to patrix 11 and counterdie 12 rapidly, thereby forms disk-shaped glass goods (being chunk glass 101).
Next, remove patrix 11 from counterdie 12, chunk glass 101 cools off on the sunk part 12a of counterdie 12.In extrusion process, the temperature of patrix 11 is configured to be lower than the temperature of counterdie 12.But, because extrusion time is very short, thus the moment of the temperature of chunk glass 101 when extruding is finished be that temperature near the upside of patrix 11 is higher than the temperature near the downside of counterdie 12.Therefore in the cooling procedure temperature slippage of the first surface 110 (patrix side) of chunk glass 101 greater than the temperature slippage of the second surface 120 of chunk glass 101.Therefore, in cooling procedure, first surface 110 shrinks serious than second surface 120, thereby causes the warpage in the chunk glass 101 outstanding downwards.
As indicated above, in this embodiment, forming inclined-plane 112 and inclined-plane 122 between first surface 110 and the outshot 111 and between second surface 120 and the outshot 121 respectively.In addition, form similar inclined-plane 12c and 11e1 on each in counterdie 12 and flatness correction patrix.
As indicated above, if cause warpage in chunk glass 101, then chunk glass 101 is unstable by the state meeting that counterdie 12 keeps, and chunk glass 101 may move on the flat surface 12d of counterdie 12.In this embodiment, the angle θ 2 that forms between the angle θ 1 that forms between inclined-plane 112 and the first surface 110 and inclined-plane 122 and the second surface 120 is configured to be less than or equal to 30 °.Therefore, when carrying out flatness correction extruding, the inclined-plane that upper die and lower die are proofreaied and correct along inclined-plane and counterdie 12, the flatness of flatness correction patrix in inclined-plane 112 and inclined-plane 122 slides.As a result of, can be contained in counterdie 12 and flatness securely at chunk glass 101 proofreaies and correct state in the confined space (corresponding to the confined space P among Fig. 5) between the patrix and carries out plane correction down and push.
Therefore, in this embodiment, can prevent that not being accommodated in counterdie 12 and flatness at chunk glass 101 proofreaies and correct under the state in the confined space between the patrix and carry out the plane correction extruding, thereby can prevent to occur in the chunk glass 101 be shaped wrong (shaping error).
Although angle θ
1With angle θ
2In each can be configured to more than or equal to 30 °, but preferably, angle θ
1With angle θ
2In each can be configured to be less than or equal to 30 ° because by with angle θ
1With angle θ
2In each set for and be less than or equal to 30 °, the inclined-plane 112 of chunk glass 101 and inclined-plane 122 be easy at counterdie 12 and each inclined-plane of the patrix of the compacting that is used to anneal on slide.
Even second surface 120 sides of chunk glass 101 are shunk in cooling procedure, the inclined-plane 122 of second surface 120 sides of chunk glass 101 also slides along the inclined-plane 12c of counterdie 12.This configuration can prevent that the outshot 121 of chunk glass 101 from colluding on counterdie 12, thereby can prevent first surface 110 and second surface 120 distortion.
As indicated above, the angle part 125 that is configured to according to the chunk glass 101 of this embodiment form between the angle part 115 that forms between angle part 124, circumferential surface 130 and the outshot 111 between the end face 121a of angle part 123, inclined-plane 122 and outshot 121 between angle part 114, second surface 120 and the inclined-plane 122 between the end face 111a of angle part 113, inclined-plane 112 and outshot 111 between first surface 110 and the inclined-plane 112 and circumferential surface 130 and the outshot 121 is circular.Usually, have the angle part of protruding shape and compare with flat surface and have easily the characteristic of heat from wherein taking away, the angle part with concave shape is compared with flat surface to have and is difficult to the characteristic of heat from wherein taking away.Therefore, when chunk glass is cooled off, may cause big thermal deformation in the angle part.In this embodiment, each angle part is circular, thereby in the angle part of protruding, heat is difficult to be brought to the outside, and in the angle part of depression, heat is brought to the outside easily.As a result of, can suppress in the cooling procedure thermal deformation that occurs in each angle part of chunk glass.
The flatness of the chunk glass 101 of manufacturing as indicated above is 18 μ m.Therefore, according to embodiments of the invention, acquisition has the chunk glass of the flatness of 20 μ m or excellence still less.
On the other hand, do not forming on first surface and the second surface under the situation on inclined-plane, the flatness of the chunk glass that forms by compression molding is 50 μ m.When each of first surface and second surface is formed sunk surface, and each angle part between each in side and first surface and the second surface is not formed circular, but when being formed seamed edge, the flatness of chunk glass is 100 μ m.As indicated above, not satisfying the chunk glass that requires according to an embodiment of the invention is 50 μ m or higher, is not enough with regard to flatness.
Comprise center pit forming process, perimeter treatment, grinding and grinding and cleaning of carrying out afterwards and dry already known processes by execution, we use the chunk glass manufacturing of the flatness with 18 μ m to be used for the substrate of magnetic recording media.Owing to used the chunk glass with excellent flatness, process of lapping successfully shortens.
Can carry out chemical enhanced (chemical strengthening) to the substrate that is used for magnetic recording media mentioned above as required.
Formation comprises that the known film of magnetic recording layer is to form disk (being magnetic recording media) on the substrate of magnetic recording media being used for.
Though described in detail the present invention with reference to the preferred embodiments of the present invention, other embodiment also is possible.
Claims (16)
1. a chunk glass is formed laminal glass molding product, comprising:
First outshot, give prominence to along the normal direction of described first surface its marginal portion that is formed in the first surface of described chunk glass; And
Second outshot, give prominence to along the normal direction of described second surface its marginal portion that is formed in the second surface of described chunk glass,
Wherein:
The end face of the end face of described first outshot and described second outshot is roughly parallel to described first surface and described second surface respectively;
Formation extends to first inclined-plane of described first surface from the end face of described first outshot; And
Formation extends to second inclined-plane of described second surface from the end face of described second outshot.
2. chunk glass according to claim 1,
In the angle that forms between the angle that forms between wherein said first inclined-plane and the described first surface and described second inclined-plane and the described second surface each is less than or equal to 30 °.
3. chunk glass according to claim 1,
In the angle part between angle part between wherein said first surface and described first inclined-plane and described second surface and described second inclined-plane each is circular.
4. chunk glass according to claim 1,
In the angle part between angle part between the end face of wherein said first outshot and described first inclined-plane and the end face of described second outshot and described second inclined-plane each is circular.
5. chunk glass according to claim 1,
In the angle part between the side of the angle part between the end face of wherein said first outshot and the side of described chunk glass and the end face of described second outshot and described chunk glass each is circular.
6. chunk glass according to claim 1,
The end face of the end face of wherein said first outshot, described second outshot, the part that is centered on described first surface by described first inclined-plane, the part that is centered on described second surface by described second inclined-plane are flat surfaces, and parallel to each other substantially.
7. method of making chunk glass comprises:
Extrusion process forms chunk glass as laminal glass molding product by the softening glass material of extruding between upper die and lower die,
Wherein each in the employed upper die and lower die has straight portion, outer peripheral portion and inclined-plane in described extrusion process, described straight portion is a basic horizontal, described outer peripheral portion is formed on the whole periphery of described straight portion, so that the bottom surface of described outer peripheral portion be basic horizontal and with respect to described straight portion depression, described inclined-plane is formed between described straight portion and the described outer peripheral portion.
8. the method for manufacturing chunk glass according to claim 7,
Further comprise:
Cooling procedure, it is carried out after described extrusion process, under the state that has removed described patrix from described counterdie the chunk glass on the described counterdie is cooled off.
9. the method for manufacturing chunk glass according to claim 7,
The angle that forms between the inclined-plane in wherein said straight portion and described patrix and the described counterdie each is less than or equal to 30 °.
10. the method for manufacturing chunk glass according to claim 7,
The angle part that forms between the inclined-plane in wherein said straight portion and described patrix and the described counterdie each is circular.
11. the method for manufacturing chunk glass according to claim 7,
The angle part that forms between the inclined-plane in the bottom surface of wherein said outer peripheral portion and described patrix and the described counterdie each is circular.
12. the method for manufacturing chunk glass according to claim 7,
Angle part between the external peripheral surface of the outer peripheral portion on each in the bottom surface of wherein said outer peripheral portion and described patrix and the described counterdie is circular.
13. a method of making the glass substrate of magnetic recording media comprises:
Processing according to each described chunk glass of claim 1 to 6 to form discoid substrate.
14. a method of making the glass substrate of magnetic recording media comprises:
By making chunk glass according to each described method in the claim 7 to 12; And
Process described chunk glass to form discoid substrate.
15. a method of making magnetic recording media comprises:
Processing according to each described chunk glass of claim 1 to 6 to form discoid substrate; And
On described substrate, form magnetic recording layer at least.
16. a method of making magnetic recording media comprises:
By making chunk glass according to each described method in the claim 7 to 12;
The processed glass material is to form discoid substrate; And
On described substrate, form magnetic recording layer at least.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009266980 | 2009-11-25 | ||
| JP2009-266980 | 2009-11-25 |
Publications (2)
| Publication Number | Publication Date |
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| CN102157167A true CN102157167A (en) | 2011-08-17 |
| CN102157167B CN102157167B (en) | 2015-11-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201010561831.8A Active CN102157167B (en) | 2009-11-25 | 2010-11-24 | Chunk glass and manufacture method thereof, the substrate of magnetic recording media and magnetic recording media |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5497612B2 (en) |
| CN (1) | CN102157167B (en) |
| MY (1) | MY160257A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104081457A (en) * | 2011-09-28 | 2014-10-01 | Hoya株式会社 | Method of manufacturing glass substrates for hard disk drives |
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| US6442975B1 (en) * | 1996-12-26 | 2002-09-03 | Hoya Corporation | Method of manufacturing thin-plate glass article, method of manufacturing glass substrate for information recording medium, and method of manufacturing magnetic recording medium |
| CN1385833A (en) * | 2001-05-14 | 2002-12-18 | 日本板硝子株式会社 | Glass substrate for magnetic record mediuma nd method for making same |
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| JP3199461B2 (en) * | 1992-06-05 | 2001-08-20 | オリンパス光学工業株式会社 | Optical element molding method and molding die |
| JPH09102122A (en) * | 1995-10-03 | 1997-04-15 | Kao Corp | Substrate for recording medium |
| JP4521129B2 (en) * | 2000-03-13 | 2010-08-11 | Ｈｏｙａ株式会社 | Manufacturing method and apparatus for glass molded product, manufacturing method for glass substrate, information recording medium |
| JP5015184B2 (en) * | 2009-02-25 | 2012-08-29 | Ｈｏｙａ株式会社 | Information recording medium glass blank, information recording medium substrate manufacturing method, and information recording medium manufacturing method |
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- 2010-10-22 JP JP2010237308A patent/JP5497612B2/en active Active
- 2010-11-23 MY MYPI2010005500A patent/MY160257A/en unknown
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6442975B1 (en) * | 1996-12-26 | 2002-09-03 | Hoya Corporation | Method of manufacturing thin-plate glass article, method of manufacturing glass substrate for information recording medium, and method of manufacturing magnetic recording medium |
| CN1385833A (en) * | 2001-05-14 | 2002-12-18 | 日本板硝子株式会社 | Glass substrate for magnetic record mediuma nd method for making same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104081457A (en) * | 2011-09-28 | 2014-10-01 | Hoya株式会社 | Method of manufacturing glass substrates for hard disk drives |
| CN104081457B (en) * | 2011-09-28 | 2017-05-10 | Hoya株式会社 | Method of manufacturing glass substrates for hard disk drives |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102157167B (en) | 2015-11-25 |
| JP5497612B2 (en) | 2014-05-21 |
| JP2011132116A (en) | 2011-07-07 |
| MY160257A (en) | 2017-02-28 |
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