CN102625782B - Glass blank, glass blank manufacturing method, manufacturing method for substrate for information recording medium, and manufacturing method for information recording medium - Google Patents
Glass blank, glass blank manufacturing method, manufacturing method for substrate for information recording medium, and manufacturing method for information recording medium Download PDFInfo
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- CN102625782B CN102625782B CN201080040555.9A CN201080040555A CN102625782B CN 102625782 B CN102625782 B CN 102625782B CN 201080040555 A CN201080040555 A CN 201080040555A CN 102625782 B CN102625782 B CN 102625782B
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- glass blank
- shaping dies
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/8404—Processes or apparatus specially adapted for manufacturing record carriers manufacturing base layers
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
- C03B11/06—Construction of plunger or mould
- C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
- C03B11/088—Flat discs
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Magnetic Record Carriers (AREA)
- Surface Treatment Of Glass (AREA)
Abstract
The invention provides a glass blank, a glass blank manufacturing method, manufacturing method for substrate for information recording medium and manufacturing method for information recording medium. The method for making substrates for information recording media from a glass blank exhibits excellent flatness and inhibits the occurrence of dent traces, even if the processing quantity is reduced by the thinning of the glass blank. The glass blank has a disc-shaped thin part (10), and a thick part (12) provided so as to form projecting sections (12U, 12D) on both surfaces of the thin part (10) and along the peripheral edge thereof. In the diametrical direction of the thin part (10), the width (W1) in the radial direction of the projecting section (12D) on one surface side in the diametrical direction of the thin part is larger than the width (W2) in the radial direction of the projecting section (12U) on the other surface side.
Description
Technical field
The present invention relates to glass blank, glass blank manufacture method, substrate for information recording medium manufacture method and information recording medium manufacturing method.
Background technology
The substrate of using as information recording carriers such as magnetic recording medias and be widely used glass substrate.Manufacture method as such glass substrate for information recording medium processed, except the rough glass from tabular, cut out the method for discoideus glass, will be by following method,, utilize method (so-called straight pressing) that a pair of shaping dies suppresses melten glass or will manufacture that the glass of size close to product reheats and by its fusing, and the glass blank of method (so-called reheat compacting (Reheat the press)) manufacture of more critically compacting is again processed into regulation shape, thus manufacturing information recording medium substrate.
The substrate for information recording medium of manufacturing through such technique, requires to have specific thickness and have hardly warpage.In addition, in order to tackle, reduce costs, the grind of dwindling while using substrate by glass blank manufacturing information recording medium is very important.Therefore, for glass blank, not only require slimming, also require further to improve planeness (minimizing warpage).In order to tackle, improve this requirement of planeness, the technology of the warpage of glass blank has been proposed to proofread and correct by implementing warpage correcting process by the applicant, wherein, this warpage correcting process is the operation (patent documentation 1) of again suppressing being the glass of roughly tabular soft state after firm compacting.
In addition, the warpage producing during press molding can remain on glass blank to some extent.Therefore,, for the glass blank with such warpage, even grind with the state of exerting pressure from two sides, when being removed, institute's applied pressure also can again produce warpage.In order to address this problem, by the applicant, following technology has been proposed,, when glass blank is carried out to lappingout, in the peripheral end of glass blank etc., locate to arrange take and put on the slab portion that the pressure on glass blank two sides is object (claim 1 of patent documentation 2,0013 paragraph, Fig. 2 etc.) while accepting lappingout.
Patent documentation 1: No. 3286956th, Japanese Patent
Patent documentation 2: No. 3714501st, Japanese Patent
These technology that proposed by the applicant, are suppressing glass blank or as very useful aspect the warpage of the substrate for information recording medium of the finished product.But, in the technology of utilizing patent documentation 2 to record and use when forming glass blank that protruding mode is provided with slab portion on the two sides with the periphery at discoideus thin plate part and coming manufacturing information recording medium to use substrate, if seek to reduce costs and make glass blank thin plate, and the amount of finish of glass blank is reduced, on the one side of this substrate, produce sometimes the recessed mark that forms ring-type along peripheral end.The substrate that remains so recessed mark cannot use as substrate for information recording medium.
Summary of the invention
The present invention In view of the foregoing makes, its problem is, provide that a kind of can to manufacture planeness outstanding, even and if because the thin plate of glass blank and amount of finish reduce glass blank and the manufacture method thereof of the substrate for information recording medium that also can suppress to produce recessed mark and substrate for information recording medium manufacture method and the information recording medium manufacturing method that uses this glass blank.
Above-mentioned problem realizes by following the present invention.; glass blank of the present invention is characterised in that; there is discoideus thin plate part and be configured to and with respect to the two sides of thin plate part, form the slab portion of protuberance along the outer periphery portion of this thin plate part; and; the radial width of the raised part with respect to the diametric(al) of thin plate part in a face side, is greater than the radial width of the raised part in another face side.
Glass blank manufacture method of the present invention is characterised in that, as a pair of shaping dies that is configured to can relatively move with respect to vertical direction, use the first shaping dies and the second shaping dies, and at least through any one suppression process of selecting, manufacture glass blank of the present invention from the first suppression process and the second suppression process; Wherein, the first shaping dies possesses press face, and this press face when press molding and the glass contact of soft state, and has circular central part and to form the mode of recess with respect to central part, is arranged on the outer edge of the perimeter sides of this central part; The second shaping dies possesses press face, this press face when press molding and the glass contact of soft state, and has diameter than the also little circular central part of the central part of the first shaping dies and to form the mode of recess with respect to this central part, is arranged on the outer edge of the perimeter sides of this central part; In the first suppression process, using the shaping dies that is configured in vertical direction lower side as the first shaping dies, using the shaping dies that is configured in vertical direction upper side as the second shaping dies, and after in the press face that the glass block of soft state is configured to the first shaping dies, utilize the press face of the first shaping dies and the press face of the second shaping dies, so that glass block arrives the mode of outer edge of the press face of the first shaping dies, this glass block is suppressed; In the second suppression process, using the shaping dies that is configured in vertical direction lower side as the second shaping dies, using the shaping dies that is configured in vertical direction upper side as the first shaping dies, and after in the press face that the glass block of soft state is configured to the second shaping dies, utilize the press face of the first shaping dies and the press face of the second shaping dies, so that glass block arrives the mode of outer edge of the press face of the first shaping dies, this glass block is suppressed.
An embodiment of glass blank manufacture method of the present invention, preferably to be the glass of roughly tabular soft state after suppression process, implement to utilize at least one method in method (1) and method (2) to suppress to produce the warpage inhibition operation of warpage, wherein, aforesaid method (1) refers to: the method that applies the temporary transient warpage producing of the mandatory correction of external force, be that warpage is proofreaied and correct compacting, aforesaid method (2) refers to: the cooling conditions of the upper and lower surface of the soft state glass that prevents from being roughly tabular after just compacting departs from, and with roughly the same condition, above-mentioned upper and lower surface is carried out to cooling method.
Substrate for information recording medium manufacture method of the present invention is characterised in that, at least through the two sides of glass blank being carried out to the operation of attrition process and/or polishing, carry out manufacturing information recording medium substrate, wherein, this glass blank is any one glass blank of selecting from glass blank of the present invention and the glass blank by glass blank manufacture method of the present invention manufacture.
Information recording medium manufacturing method of the present invention is characterised in that, at least through information recording layer, form operation and carry out manufacturing information recording medium, wherein, this information recording layer formation operation is on the major surfaces of the substrate for information recording medium by substrate for information recording medium manufacture method of the present invention manufacture, to form the operation of information recording layer.
(invention effect)
According to the present invention, can provide planeness outstanding, even and because the thin plate of glass blank and amount of finish reduce also can suppress to produce recessed mark, can be for manufacturing information recording medium glass blank and the manufacture method thereof of substrate and substrate for information recording medium manufacture method and the information recording medium manufacturing method that uses this glass blank.
Accompanying drawing explanation
Fig. 1 means the constructed profile of an example of the glass blank of present embodiment.
Fig. 2 means the constructed profile of other examples of the glass blank of present embodiment.
Fig. 3 means the constructed profile of an example of a pair of shaping dies using in the glass blank manufacture method of present embodiment.
Fig. 4 is the explanatory view that produces the principle of recessed mark while coming manufacturing information recording medium with substrate with existing glass blank for illustrating.
Fig. 5 is the explanatory view that produces the principle of recessed mark while coming manufacturing information recording medium with substrate with existing glass blank for illustrating.
Fig. 6 is the explanatory view that produces the principle of recessed mark while coming manufacturing information recording medium with substrate with existing glass blank for illustrating.
Nomenclature
1 glass blank
10 thin plate parts
12 slab portions
12U, 12D protuberance
The face that 12S tilts
14C bight
20 molds
30 bed dies
22 press face
22A central part
22B outer edge
32 press face
32A central part
32B outer edge
100,100H, 100C glass blank
102 substrate for information recording mediums
110 thin plate parts
112 slab portions
112U, 112D protuberance
114C bight
The recessed mark of 114P, 114Q
Embodiment
(glass blank and manufacture method thereof)
-glass blank (Glass blank)-
The glass blank of present embodiment is characterised in that, there is discoideus thin plate part and with respect to the two sides of thin plate part, form the slab portion that the mode of protuberance arranges with the periphery along this thin plate part, and, the radial width of the raised part with respect to the diametric(al) of thin plate part in a face side, is greater than the radial width of the raised part in another side side.
In the glass blank of present embodiment, be provided with the slab portion that forms protuberance with respect to the two sides of thin plate part.Therefore,, when carrying out lappingout (Lapping), only by this slab portion, bear a pair of grinding machine (Lapping plate, grinding flat plate) being configured by the mode with clamping glass blank and put on the pressing force on the two sides of glass blank.Because being carries out lappingout and slab portion is ground off with this state, and then also thin plate part is ground off, therefore, can take and can not make because of the pressing force as being applied by grinding machine the mode of glass blank recoverable deformation carry out lappingout.Therefore,, as long as glass blank is flatly processed by lappingout, even if remove the pressing force being applied by grinding machine, also can guarantee the Flatness of glass.On the other hand, if carry out lappingout with the state of recoverable deformation, even if want glass blank to process smooth, once the pressing force being applied by grinding machine is removed, the distortion of glass can recover, thereby also cannot obtain Flatness.The planeness of the substrate for information recording medium therefore, obtaining through lappingout operation is outstanding.
In addition,, in the glass blank of present embodiment, the radial width of the protuberance with respect to the diametric(al) of thin plate part in a face side, is greater than the radial width of protuberance of another face side of thin plate part.This for just compacting of glass blank after the warpage of glass in process of cooling soon configure, to can effectively suppress its warpage.As known from the above, in the glass blank of present embodiment, when having manufactured substrate for information recording medium, can suppress the recessed mark that the warpage that has because of glass blank or distortion produce.
For the effect that can suppress to produce so recessed mark, below when the glass blank of present embodiment and existing glass blank are contrasted, use accompanying drawing more specifically to describe.Fig. 4～Fig. 6 is the explanatory view that produces the principle of recessed mark while using existing glass blank manufacturing information recording medium with substrate for illustrating.At this, the glass blank 100 shown in Fig. 4 and Fig. 5, there is discoideus thin plate part 110 and two sides with respect to this thin plate part 110 and form in slab portion 112 this point of annular convex 112U, 112D identical with the glass blank of present embodiment.But, different with the glass blank of present embodiment in the radial width of protuberance 112D of a face side D of glass blank 100 and the identical this point of radial width of the protuberance 112U of another face side U.Fig. 4 mean utilize a pair of shaping dies (mold and bed die) just after press molding and mold be about to the constructed profile of the section shape in the diametric(al) of the condition of high temperature glass blank 100H from glass blank 100 is separated.In addition, in Fig. 4, omitted the record about mold and bed die.Fig. 5 means the constructed profile that the glass blank 100H shown in Fig. 4 is cooled to the section shape in the diametric(al) of the glass blank 100C after the temperature range below second-order transition temperature Tg.Fig. 6 means the constructed profile of the section shape in the diametric(al) of implementing the substrate for information recording mediums 102 that operation obtains afterwards such as lappingout (state before end face processing) by the glass blank 100C to shown in Fig. 5.It should be noted that, in Fig. 4～Fig. 5, the face that the represented face of symbol U contacts with mold while referring to press molding or contacted face, the face that the represented face of symbol D contacts with bed die while referring to press molding or contacted face.In the following description, sometimes the represented face of symbol U is called to " upper surface ", the face that symbol D is represented is called " lower surface ".
As shown in Figure 4, in the glass blank 100H of the condition of high temperature after maintaining firm compacting, glass blank has copied the shape of metal die, and does not produce warpage.But after compacting, if upper surface side is different from the process of cooling of lower face side, the warpage of the glass blank causing because of the difference of the thermal contraction of glass can become obvious.Therefore,, if the glass blank 100H shown in Fig. 4 is cooling, can become as shown in Figure 5 the glass blank 100C towards the mode bending of upper surface side warpage.
Therefore, when using this glass blank 100C to manufacture substrate for information recording medium 102, because the slimming of glass blank 100C and grind (1apping allowance) diminishes, can produce recessed mark 114P, 114Q (Fig. 6) at the central part place of the bight of lower surface 114C part and upper surface thus.
The warpage of glass blank 100C is larger and/or more make glass blank 100C become thinner (that is, the grind of manufacturing information recording medium during with substrate 102 is less), and so recessed mark 114P, 114Q is more obvious.
In addition, sometimes in order to proofread and correct the warpage of glass blank 100C, glass blank 100C is implemented to warpage such shown in patent documentation 1 grade and proofread and correct compacting.In this case, it is to utilize warpage to proofread and correct pressed part that warpage is proofreaied and correct compacting, and the upper surface side of the thin plate part 110 of the glass blank 100C of the temperature that is set to be out of shape whole (the represented region of symbol RP shown in Fig. 5) is suppressed.
Fig. 1 means the constructed profile of an example of the glass blank of present embodiment.It should be noted that, the RP of symbol shown in figure, U, D are identical with symbol shown in Fig. 4～Fig. 6.Be provided with discoideus thin plate part 10 and the two sides with respect to thin plate part 10 forms in slab portion 12 this point of annular convex 12U, 12D along the periphery of this thin plate part 10, the glass blank 1 shown in Fig. 1 is identical with the illustrated existing glass blank 100 of Fig. 5 with Fig. 4.But, at the radial width W1 of the protuberance 12D of a face side D of glass blank 1, being greater than in the radial width W2 this point of protuberance 12U of another face side U, glass blank 1 is different from existing glass blank 100.
That is, with the situation of Fig. 4 and the illustrated existing glass blank 100 of Fig. 5 similarly, the width W 2 of protuberance 12U is confirmed as can guaranteeing to bear when lappingout this function of pressing force (pressing force bears function) being applied by grinding machine.With respect to this, the width W 1 of protuberance 12D is on this pressing force bears the basis of function, also to consider to make the rigid phase of glass blank 1 further be improved this viewpoint than existing glass blank 100 and definite.; for the condition of high temperature the firm compacting from glass blank, make the upper surface of glass blank 1 separated with mold and be cooled to the warpage of the glass blank in the process below second-order transition temperature Tg; by obtain in advance the direction of glass blank warpage from temperature history, and change the warpage that the width be arranged on protuberance 12U, 12D on each face with respect to this direction suppresses glass.
Therefore, with this glass blank 1 and when implementing the rear operation of lappingout etc. and manufactured substrate for information recording medium, even if grind is diminished because of the slimming of glass blank 1, also can suppress to produce Fig. 5 and the recessed mark 114P being caused by warpage as shown in Figure 6.
In addition, also can with prior art similarly, also glass blank 1 is implemented to warpage and proofreaies and correct compacting.In this case, the most peripheral end of warpage correction nip region RP is set at the more lateral, side, inner circumferential side (the represented line of dotted line in Fig. 1) than protuberance 12D.And, when having implemented warpage correction compacting with such state, not only can apply pressing force to thin plate part 10, can also to a part for slab portion 12 (in diametric(al) than the side, inner circumferential side of protuberance 12U more inner circumferential side part and than the side, inner circumferential side of the protuberance 12D part of outer circumferential side more) apply pressing force.
In addition, in the glass blank 1 shown in Fig. 1, the face that is provided with narrow protuberance 12U mono-side of width is set as and when compacting, contacts with mold and then when implementing warpage correction compacting, by warpage, proofreaied and correct pressed part and suppress the face (upper surface) of a side.When carrying out warpage correction compacting, the upper surface of glass blank 1 is to use the parts compacting different from the mold using in press molding.Carry out warpage while proofreading and correct compacting, because the viscosity ratio thin plate part 10 of the slab portion 12 of glass blank 1 is low, and having the danger that makes 12 distortion of slab portion during by 12 compacting of slab portion, therefore, preferably from top, only thin plate part 10 is suppressed, and, preferably in a wide range thin plate part 10 is suppressed.But proofreading and correct compacting due to warpage is to use the parts different from mold to suppress as mentioned above, therefore, if Patterned laminate portion 10 gamuts under the state that occurs a little to misplace with parts can occur also by the danger of the part compacting of slab portion 12.Therefore, for the upper surface of pressed glass blank 1 not by slab portion 12 compacting and in a wide range, preferably with the narrow protuberance 12U of width, become upper surface, the side that area of thin plate part 10 is large becomes the mode of upper surface and carries out press molding.In the situation that not implementing warpage correction compacting, be provided with the face of narrow protuberance 12U mono-side of width, the face having contacted with mold in the time of can being both compacting, can be also the face contacting with bed die.This is because in either event, and the ratio that becomes relatively thick region with respect to the diametric(al) of glass blank 1 all increases and further improves rigidity, thereby has suppressed warpage.
In addition, in the glass blank 1 shown in Fig. 1, the side, inner circumferential side of protuberance 12D is that the lower surface with respect to thin plate part 10 is vertical face.But, the side, inner circumferential side of protuberance 12D can be also with as shown in Figure 2 from the top ends side of protuberance 12D towards the lower face side of thin plate part 10 and the face 12S that the mode that width broadens tilts with respect to the lower surface of thin plate part 10.Inclination angle in this situation (the angle θ shown in Fig. 2) is from the intersect viewpoint of part breakage of the top end face of the face 12S that prevents from tilting and protuberance 12D, and preferably 30 degree above and be less than 90 degree.And then it is above and be less than 80 degree to be more preferably 40 degree.
At this, the pressing force of the width W 2 of protuberance 12U when guaranteeing lappingout bears the viewpoint of function, can as illustrated in 0008 paragraph of patent documentation 2, be set as 2.0mm left and right, particularly, preferred settings, in the scope of 1mm～6mm, is more preferably in the scope that is set in 1mm～4.5mm.More than width W 2 is set as to 1mm, the pressing force in the time of can making protuberance 12U bring into play lappingout reliably bears function.In addition, by width W 2 is set as below 4.5mm, the material removal rate in the time of can preventing lappingout (Removal rate) reduces too much, thereby can prevent the manufacture Efficiency Decreasing of substrate for information recording medium.
From the hot resume of glass, obtain in advance the direction of glass blank 1 warpage, and a side that glass blank 1 warpage is become to convex surface is defined as W1, a side that becomes concave surface is defined as to W2.Now, the width W 1 of protuberance 12D is with the ratio (W1/W2) of the width W 2 of protuberance 12U preferably more than 1.0, more preferably more than 2.0, further preferably more than 3.0.In addition,, from the workability (process period of attrition process) of glass processing, W1/W2 is preferably below 6.0, more preferably below 5.0, further preferably below 4.5.
The height of protuberance 12U (in Fig. 1, symbol H1 is represented take the height that the upper surface of thin plate part 10 is reference plane) is also not particularly limited, and still, preferably sets in the scope of 0.05mm～0.1mm.By being more than 0.05mm by the height setting of protuberance 12U, the pressing force in the time of can making protuberance 12U bring into play lappingout reliably bears function.In addition, by the height H of protuberance 12U 1 is set as below 0.1mm, the grind in the time of can preventing lappingout too increases, thereby can prevent the manufacture Efficiency Decreasing of substrate for information recording medium.
The height of protuberance 12D (in Fig. 1, symbol H2 is represented take the height that the lower surface of thin plate part 10 is reference plane) is also not particularly limited, and still, preferably sets in the scope of 0.05mm～0.1mm.By being more than 0.05mm by the height setting of protuberance 12D, the pressing force in the time of can making protuberance 12D bring into play lappingout reliably bears function.In addition, by the height H of protuberance 12D 2 is set as below 0.1mm, the grind in the time of can preventing lappingout too increases, thereby can prevent the manufacture Efficiency Decreasing of substrate for information recording medium.
In addition, as mentioned above, when having manufactured substrate for information recording medium 102 by the illustrated such existing glass blank 100 of Fig. 4, Fig. 5, the generation of recessed mark 114P, 114Q can present the slimming of glass blank 100, i.e. the less more obvious trend of the aspect ratio of glass blank 100 (Aspect ratio) (the ratio t/d of the diameter d of the thickness t of thin plate part 110 and glass blank 100).But the glass blank 1 of present embodiment is compared with existing glass blank 100, large with respect to diametric slab part ratio.Therefore, even if the aspect ratio of the glass blank of present embodiment 1 is less than existing glass blank 100, the reduction of its rigidity is also little, thereby warpage is also few, therefore, is also difficult to produce recessed mark 114P.Consider this point, the aspect ratio of the glass blank 1 of present embodiment is preferably below 0.018, more preferably 0.013～0.017 scope.In the glass blank of present embodiment, even aspect ratio is made as below 0.018, also can suppress more reliably to produce unavoidable recessed mark 114P, the 114Q producing in existing glass blank 100.In addition, the lower limit of aspect ratio is also not particularly limited, and still, if be difficult to make glass to extend compared with unfertile land when suppressing from aspect ratio is too small, thereby makes the manufacture of glass blank itself cannot wait the viewpoint in practicality, preferably more than 0.010.In addition, in present specification, the thickness t of using in order to determine aspect ratio refers to the thickness of thin plate part 10,110 as shown in Fig. 1 or Fig. 4.In addition, in the glass blank of present embodiment, even aspect ratio is set as below 0.018, also can suppress more reliably the generation of recessed mark 114Q, but, in the end the central part of substrate for information recording medium 102 is implemented in the situation of perforation processing, this recessed mark 114Q also can left behind.This is because recessed mark 114Q is processed and can be removed by perforation, therefore, in the substrate for information recording medium (finished product) that has passed through perforation processing, can not remain recessed mark 114Q.
-manufacture method of glass blank-
The glass blank 1 of present embodiment is manufactured by straight pressing (Direct pressing method).At this, when press molding, as a pair of shaping dies, use the first shaping dies and the second shaping dies, wherein, the first shaping dies possesses press face as following, that is, when press molding and the glass contact of soft state, and there is circular central part and to form the mode of recess with respect to central part, be arranged on the outer edge of the perimeter sides of this central part; The second shaping dies possesses press face as following,, when press molding and the glass contact of soft state, and have diameter be less than the first shaping dies central part circular central part and to form the mode of recess with respect to this central part, be arranged on the outer edge of the perimeter sides of this central part.A pair of shaping dies for example can be configured to can relatively move with respect to vertical direction.
In this case, can at least pass through the glass blank that following (1) or any one suppression process shown in (2) are manufactured present embodiment.
(1) using the shaping dies (bed die) that is configured in vertical direction lower side as the first shaping dies, using the shaping dies (mold) that is configured in vertical direction upper side as the second shaping dies, and after in the press face that the glass block of soft state is configured to the first shaping dies, utilize the press face of the first shaping dies and the press face of the second shaping dies, so that glass block arrives the suppression process (the first suppression process) that the mode of outer edge of the press face of the first shaping dies is suppressed glass block.
(2) using the shaping dies (bed die) that is configured in vertical direction lower side as the second shaping dies, using the shaping dies (mold) that is configured in vertical direction upper side as the first shaping dies, and after in the press face that the glass block of soft state is configured to the second shaping dies, utilize the press face of the first shaping dies and the press face of the second shaping dies, so that glass block arrives the suppression process (the second suppression process) that the mode of outer edge of the press face of the first shaping dies is suppressed glass block.
At this, Fig. 3 means the constructed profile of an example of a pair of shaping dies using in the manufacture method of glass blank of present embodiment, the figure of the section while specifically representing shaping dies to cut off in the mode vertical with its press face.A pair of shaping dies shown in Fig. 3 consists of mold 20 and bed die 30, and when suppressing, mold 20 is configured in vertical direction upper side, and bed die 30 is configured in vertical direction lower side.Mold 20 possesses press face 22, and wherein, this press face 22 has circular central part 22A and to form the mode of recess with respect to central part 22A, is arranged on the 22B of annular outer edge portion of the perimeter sides of central part 22A.Bed die 30 possesses press face 32, and wherein, this press face 32 has circular central part 32A and to form the mode of recess with respect to central part 32A, is arranged on the 32B of annular outer edge portion of the perimeter sides of central part 32A.But the diameter of the central part 32A of the press face 32 of bed die 30 is less than the diameter of central part 22A of the press face 22 of mold 20.In addition, a pair of shaping dies both can consist of parts respectively, also can combine a plurality of parts and form.At a plurality of parts of combination, form in the situation that, both each parts can have been interfixed, state that also can be mutually mobile with each parts forms shaping dies.
When the glass blank 1 of the illustrated such present embodiment of shop drawings 1, after on the central part 32A of press face 32 that the glass block of soft state is supplied to bed die 30, utilize mold 20 and bed die 30, so that the mode of the outer edge 22B of the press face 22 of this glass block arrival mold 20 is carried out press molding to this glass block.In addition, in order to obtain the glass blank identical shaped with glass blank shown in Fig. 11, also can make mold 20 and bed die 30 be and turn upside down with respect to the configuration relation of vertical direction.
Therefore the warpage of, preferably implementing to suppress to produce warpage to be the glass of roughly tabular soft state after suppression process suppresses operation.The warpage that produces warpage in inhibition suppresses in operation, roughly can utilize any in following methods: (1) applies the method (warpage correction compacting) of the temporary transient warpage producing of the mandatory correction of external force; (2) cooling conditions of the upper and lower surface of the soft state glass that prevents from being roughly tabular after just compacting departs from, and to upper and lower surface, carries out cooling with roughly the same condition.
As the warpage of (1), proofread and correct compacting and can enumerate following manner, that is: after the glass blank 1 obtaining as described above as shown in Figure 1, glass blank 1 is being reheated to holding under the state of yielding temperature, utilize smooth a pair of substrate to press, thereby make glass blank 1 be deformed into smooth form by external force; Or the glass of the soft state after utilizing smooth a pair of substrate to firm press molding (glass that shape is identical with the glass blank 1 of the illustrated present embodiment of Fig. 1) is pressed, thereby make this glass deformation by external force, is smooth form.
At this, as the internal temperature that carries out the glass blank 1 of warpage while proofreading and correct compacting, preferably than the high temperature of vitrifying transition temperature Tg.Thus, because glass blank 1 has the pliability that is easy to appropriateness distortion, therefore, even glass blank 1 is applied, external force also can suppress to break more reliably or the situation of crackle.In addition, the upper limit of the internal temperature of glass blank 1 is also not particularly limited, and still, preferred glass transition temperature Tg is below+80 ℃ in practical.Thus, after having implemented warpage correction compacting, glass blank 1 is also difficult to maintain the state that is easy to soft distortion, therefore, can suppress warpage and proofread and correct the distortion once again after suppressing.From preventing glass breakage and preventing glass and the viewpoint of substrate welding, the temperature that warpage is proofreaied and correct the smooth substrate using in compacting preferably sets in the scope of 400～650 ℃.
In addition, (2) upper and lower surface soaking is cooling is to carry out like that as described below,, after press molding, to be just soon roughly with mold mode that the upper surface of tabular soft state glass comes close to or in contact with from upper surface is separated, by being heated to flat piece with bed die same degree temperature, be configured under the state of upper surface side of this soft state glass, the temperature of roughly tabular soft state glass is cooled to below the temperature (that is, vitrifying transition temperature) that is difficult to distortion.If implement so cooling, after press molding, be roughly tabular soft state glass two sides cooling conditions depart from suppressedly, and on two sides, produce almost impartial thermal contraction, thereby can suppress the generation of warpage.
Then,, to also comprising the typical case of manufacture method of glass blank 1 of the present embodiment of suppression process, describe.First, make the melten glass being formed by these glass materials after dissolving, clarify, stirring, with certain velocity of discharge, from discharge nozzle (Discharge nozzle), discharge continuously, and utilize the stapling machine that is called as shearing machine (Shear) periodically to cut off this molten glass flow to can constantly obtain the glass block of the soft state of certain mass.The glass block of cut soft state is supplied to (casting) on the press face of the bed die of standby under discharge nozzle.The melten glass of being discharged from discharge nozzle is soft state, and its viscosity is 0.3～100Pas left and right.In addition, the temperature of bed die is lower than the temperature of glass block, but is adjusted to the temperature that can not make the temperature of glass block sharply decline and can not suppress.In addition, in order to improve the melten glass of being cast with respect to the oilness of press face, also can in the press face of bed die, adhere to as required and in advance the solid lubricant of boron nitride (BN) powder etc.
The bed die that after the above-mentioned casting of end, the glass in soft state loads in its press face is transported to the pressing position of mold standby, thereby carries out press molding by mold and bed die.Mold now and the temperature of bed die, pressing pressure, press time are suitably to set after the diameter of considering the thermophysical property of the glass such as vitrifying transition temperature or the glass blank of manufacturing, thickness etc.For example, can be 250～550 ℃ by the Temperature Setting of mold, by the Temperature Setting of bed die, be 350～650 ℃.It is standard that impressed pressure during compacting can be take about several GPa, still, and is not particularly limited in this scope, can suitably adjust.
After press molding finishes, die products upper surface is separated with mold, and the bed die that is loaded with molding is transported to the position (extracting position) of taking out molding from bed die.In addition, also can between pressing position and extracting position, bed die be stopped, and after the warpage of utilizing the warpage of having implemented correction molding by compression mould by the upper surface of the molding on compression mould is proofreaied and correct compacting, each bed die is delivered to extracting position.Or, also can be by during bed die be carried from pressing position to extracting position, the mode coming close to or in contact with the upper surface with being positioned in the molding on bed die, whole and be heated to the temperature with bed die same degree by flat-shaped part being configured to cover the upper surface of this molding, adjust the temperature history of glass.
In addition, crooked in order to correct, and molding is put in annealing furnace and annealed.Then, through such series of processes, can access the glass blank of present embodiment.In addition, also can to the glass blank after annealing, implement warpage as required and proofread and correct compacting.
-glass composition-
Glass as the glass blank 1 of present embodiment forms, can suitably select according to the substrate or the information recording carrier that use this glass blank 1 to manufacture, for example can enumerate alumina silicate glass (Aluminosilicate glass), soda-lime glass (Soda-lime glass), sodium aluminum silicate glass (Soda-aluminosilicate glass), aluminium borosilicate glass (Aluminoborosilicate glass), borosilicate glass (Borosilicate glass), silica glass (Quartz glass), chain silicate glass (Chain silicate glass) etc.In addition, these glass can be also the crystallized glasses of the crystallization by heat treated.
In addition, as alumina silicate glass, can be used as main component and contain the SiO below the above 75wt% of 58wt%
2, the Al below the above 23wt% of 5wt%
2o
3, the Li below the above 10wt% of 2wt%
2na below the above 18wt% of O and 5wt%
2the alumina silicate glass of O (but not containing alumina silicate glass of phosphorous oxides).For example, can be also to contain the SiO below the above 75wt% of 62wt% as main component
2, the Al below the above 20wt% of 5wt%
2o
3, the Li below the above 8wt% of 2wt%
2na below the above 15wt% of O, 6wt%
2zrO below the above 8wt% of O and 0wt%
2amorphous alumina silicate glass.
(manufacture method of substrate for information recording medium)
Then, to using the situation of glass blank 1 manufacturing information substrate (following, sometimes only referred to as " substrate ") for recording medium of present embodiment to describe.In this case, can at least pass through grinding step and manufacturing information recording medium substrate, wherein, this grinding step is the operation of utilizing grinding flat plate that the state of the glass blank of present embodiment 1 clamping is ground.In addition, in the situation that form the glass of glass blank 1 have can be by thermal treatment the glass composition of crystallization, except above-mentioned operation, also can combine by heating and make the roughly crystallization operation of plate glass crystallization.In addition, a typical case as manufacturing information recording medium with substrate, for example, can implement (1) grinding step, (2) perforation process and end face manufacturing procedure, (3) major surfaces polishing process and (4) chemical enhanced operation.It should be noted that, the order of these operations also can be changed.
(1) grinding step
In grinding step, by being carried out to attrition process, two of glass blank 1 major surfacess obtain discoid glass substrate.This attrition process can be by utilizing the double-side polishing apparatus of planetary gears and using alumina series free abrasive etc. to carry out.
(2) perforation process and end face manufacturing procedure
Then, use diamond drill to form circular hole at the central part of this glass substrate, obtain the glass substrate of circular (Doughnut shaped).Can carry out chamfer machining and polishing to the outer diameter part of glass substrate and inside diameter.
(3) major surfaces polishing process
To major surfaces implement to remove residual scar or crooked be the polishing process of main purpose.As polishing fluid, for example, can use cerium oxide abrasive particle or colloidal silica.
(4) chemical enhanced operation
In the situation that the roughly plate glass using in the manufacture of substrate for information recording medium consists of alkali-metal glass such as containing lithium or sodium, the glass substrate after preferably above-mentioned grinding step and polishing process being finished is implemented chemical enhanced.By carrying out chemical enhanced operation, can make the skin section of substrate for information recording medium produce high compression stress.Therefore, can improve the shock resistance on substrate for information recording medium surface.
Chemical enhanced is by glass-impregnated is carried out in having mixed the chemical enhanced solution of saltpetre and SODIUMNITRATE.Thus, the lithium ion on glass substrate top layer and sodium ion are replaced by the sodium ion in chemical enhanced solution and potassium ion respectively, thereby glass substrate is strengthened.
These series of processes also can sequentially be carried out not according to this.The surfaceness of the information recording carrier of manufacturing through these operations can form Subnano-class according to Ra (center line average roughness).In addition, surfaceness can suitably be adjusted by selection condition.In addition, the substrate for information recording medium obtaining through above operation, can be used in the manufacture of information recording carrier of known various recording modes such as having adopted known magnetic recording, optical recording, magneto-optical recorder, is specially adapted to the manufacture of magnetic recording media.
(manufacture method of information recording carrier)
Can at least through form the information recording layer of information recording layer on the major surfaces of the substrate for information recording medium obtaining like this, form operation and manufacturing information recording medium.In addition, when manufacturing magnetic recording media, as information recording layer, be provided with magnetic recording layer.This magnetic recording media can be any one of horizontal return to zero and perpendicular magnetic recording, still, and preferred vertical return to zero.When manufacturing the magnetic recording media of perpendicular magnetic recording, adhesion layer that for example can film forming consists of Cr alloy successively on the two sides of substrate for information recording medium, the soft magnetosphere being formed by FeCoCrB alloy, the stratum basale being formed by Ru, by CoCrPt-TiO
2the perpendicular magnetic recording layer that alloy forms, the protective layer being formed by the carbon (Hydrogenated carbon) of hydrogenation and the lubricant film being formed by PFPE (Perfluoropolyether).In addition; adhesion layer, soft magnetosphere, stratum basale and perpendicular magnetic recording layer can pass through sputtering film-forming; protective layer can pass through sputtering method or CVD method (Chemical Vapor Deposition method, chemical Vapor deposition process) film forming, and lubricant film can be by dip coating method film forming.In addition, the film forming till from adhesion layer to protective layer can be used continous way (In-1ine type) or clustered (Cluster type) sputter equipment that can each layer of continuous film forming, and the film forming of lubricant film can be used dip coating device.
Embodiment
Below, enumerate with embodiment the present invention is given the account in greater detail, still, the present invention is not limited to following embodiment.
(press molder)
In the manufacture of the glass blank of each embodiment and each comparative example, use pressing unit as following, that is, along outer peripheral edges, equally spaced dispose a plurality of bed dies, and the rotary table of (index) rotation that replaces facing one direction while possessing compacting.In this pressing unit, on the prescribed position stopping at bed die along the direction of rotary table transposition rotation, be assigned: (1) is supplied to melten glass the position P (cast) in bed die press face, (2) use the mold of the top be disposed at this bed die press face and this bed die to being fed into the melten glass (gob of glass in bed die press face, Glass gob) the position P (press) suppressing, (3) use the warpage that is different parts from mold to proofread and correct compression mould and surface the upper glass blank being shaped of position P (press) is suppressed to the position P (press#2) of (warpage is proofreaied and correct compacting) from it, and (4) position P (take-out) that the glass blank of shaping is taken out from bed die press face.
This pressing unit possesses 16 bed dies, and the position that each bed die stops being equally spaced arranged on the outer edge of rotary table along the circumferential direction of rotary table.At this, the numbering with No. 1～No. 16 is composed along sense of rotation in the position that bed die is stopped, if position P (cast) is made as No. 1, position P (press) is No. 3, position P (press#2) is No. 4, and position P (take-out) is No. 12.
As bed die and mold, use press face by circular central part and to form the mode of recess with respect to central part, be arranged on shaping dies (outer rim umbilicate type shaping dies) that the outer edge of the periphery of this central part forms or shaping dies (whole flat type shaping dies) that press face only consists of tabular surface.Then, when manufacturing the glass blank of each embodiment and each comparative example, as the shaping dies as mold or bed die, according to the shape of the glass blank of manufacturing, select outer rim umbilicate type shaping dies or whole flat type shaping dies.In addition, in the situation that having used outer rim umbilicate type shaping dies, utilized aptly according to the alteration of form of the glass blank of manufacturing the shaping dies of the diameter of central part or the staggered floor (ladder is poor) of periphery and central part.
In addition, about warpage, proofread and correct the warpage of using in compacting and proofread and correct the diameter of the press face of compression mould, such when upper surface U side is provided with the glass blank of protuberance 12U, 112U at glass blank 1 or the glass blank shown in Fig. 4 100 manufactured as shown in Figure 1, used the diameter that can only suppress not being provided with the sheet section (referring to the region that the RP shown in Fig. 1 represents) of protuberance 12U, 112U.In addition, in this case, according to surplus (Margin) (the represented length of symbol M in Fig. 1), selected the diameter of press face for the mode of 1.5mm.On the other hand, when upper surface U side is not provided with the glass blank of protuberance 12U, 112U in shop drawings 1 or Fig. 4, according to the mode that can suppress whole of upper surface, selected warpage to proofread and correct the diameter of the press face of compression mould.
(embodiment 1)
-direct pressing-
After melten glass after alumina silicate glass melting is supplied in the press face of bed die, utilizing mold and bed die to suppress making, obtain thus having the glass blank 1 of the section shape shown in Fig. 1.The thickness t of the thin plate part 10 of this glass blank 1 with the ratio of diameter d, be aspect ratio (t/d), or the width W 2 of protuberance 12U, highly, the width W 1 of protuberance 12D, highly, W1/W2, as shown in table 1.In addition, diameter d is 66.0mm, in this glass blank of manufacturing in other embodiment and comparative example, is also identical.
In embodiment 1, when manufacturing glass blank 1 by straight pressing, implement in the following order each operation., at P (cast), locate melten glass to be supplied on bed die, in bed die stop place P (press), locate to suppress, in bed die stop place P (press#2), locate to utilize the warpage correction compression mould that is disposed at top to carry out warpage correction compacting to the glass blank upper surface in bed die press face, the bed die process mobile from bed die stop place P (press#2) to P (take-out), to load state in bed die by roughly tabular glass naturally cooling, in bed die stop place P (take-out), locate to be roughly tabular glass blank and to take out cooled, by bed die, from bed die stop place P (take-out) to bed die stop place P (cast), circulation is carried again.In addition, the glass blank of taking-up is put in annealing furnace, is cooled to normal temperature.
At this, main creating conditions is as follows.
Vitrifying transition temperature Tg:485 ℃
The average coefficient of linear expansion of glass: 95 * 10
-7/ K (100～300 ℃), 98 * 10
-7/ K (300～Tg ℃),
37×10
-6/K(Tg℃～530℃)
The temperature of the press face while melten glass being supplied in the press face of bed die: 500 ℃
The temperature of mold press face during compacting: 450 ℃
Thrown into the viscosity of the melten glass on bed die: 40Pas
Press time (time that glass is exerted pressure): 1 second
Warpage is proofreaied and correct the press time: 1 second
Form the material of the press face of mold and bed die: cast iron (not carrying out coating processing)
The temperature of the glass blank 1 while taking out glass blank 1 from bed die: 520 ℃
-manufacture of substrate for information recording medium-
The glass blank 1 obtaining through above technique is implemented to (1) grinding step, (2) perforation process and end face manufacturing procedure, (3) major surfaces polishing process and (4) chemical enhanced operation, then, clean and obtain substrate for information recording medium (external diameter: 65.0mm, thickness: 0.635mm, centre hole internal diameter: 20.0mm).For the substrate for information recording medium obtaining, recessed mark, planeness are evaluated, and also workability is evaluated according to attrition process required time.
(embodiment 2～11)
When manufacturing glass blank 1, except become the mode of shape shown in table 1 according to the shape of protuberance 12D, 12U, suitably changed the shaping dies using, carried out similarly to Example 1 direct pressing.In addition, the condition while coming manufacturing information recording medium with substrate with the glass blank 1 obtaining is also identical with embodiment 1, obtains substrate for information recording medium.
(comparative example 1)
Manufactured the glass blank 100 shown in Fig. 4.When manufacturing glass blank 100, except become the mode of shape shown in table 2 according to the shape of protuberance 112D, 112U, suitably changed the shaping dies using, carried out similarly to Example 1 direct pressing.In addition, the condition while coming manufacturing information recording medium with substrate with the glass blank 100 obtaining is also identical with embodiment 1, obtains substrate for information recording medium.
(comparative example 2)
Manufactured the glass blank that upper and lower surface all consists of tabular surface without Fig. 1 or Fig. 4 illustrated such protuberance and two sides.When manufacturing this glass blank, except suitably having changed the shaping dies using, carried out similarly to Example 1 direct pressing.In addition, the condition while coming manufacturing information recording medium with substrate with the glass blank obtaining is also identical with embodiment 1, obtains substrate for information recording medium.
(comparative example 3,4)
Manufactured in Fig. 4 upper surface without the glass blank of protuberance 112U.When manufacturing this glass blank, except become the mode of shape shown in table 2 according to the shape of protuberance 112D, suitably changed the shaping dies using, carried out similarly to Example 1 direct pressing.In addition, the condition while coming manufacturing information recording medium with substrate with the glass blank obtaining is also identical with embodiment 1, obtains substrate for information recording medium.
(comparative example 5,6)
Manufactured in Fig. 4 lower surface without the glass blank of protuberance 112D.When manufacturing this glass blank, except become the mode of shape shown in table 2 according to the shape of protuberance 112U, suitably changed the shaping dies using, carried out similarly to Example 1 direct pressing.In addition, the condition while coming manufacturing information recording medium with substrate with the glass blank obtaining is also identical with embodiment 1, obtains substrate for information recording medium.
(evaluation)
The substrate for information recording medium obtaining in each embodiment and comparative example has been carried out to the evaluation of recessed mark and planeness.Workability during in addition, also to attrition process is evaluated.The results are shown in following table 1 and table 2.
[table 1]
[table 2]
In addition, in table 1 and table 2, evaluation method and the judgement criteria of recessed mark and planeness are as follows.
-recessed mark-
The recessed mark on substrate for information recording medium surface; for 1000 pieces of samples; substrate surface is irradiated the light of light source (Olympus Co., Ltd's system, long-life halogen light supply apparatus ILK-7C) for visual inspection under the environment of darkroom, and along the peripheral end of substrate, observe the recessed mark of ring-type or its degree is evaluated to whether.Judgement criteria is as follows.
◎: all do not observe recessed mark in 1000 pieces.
In zero: 1000 piece, there is 1 piece of above～scope of being less than 5 pieces to observe recessed mark.
△: have 5 pieces of above～scopes of being less than 20 pieces to observe recessed mark in 1000 pieces.
*: 1000 pieces have 20 pieces to observe above recessed mark.
-planeness-
Use 10 pieces of sample determinations except protuberance other parts planeness and obtained its mean value.In addition, planeness is when making to be loaded in sample on XY Stage microscope and moving, and uses laser focusing type extensometer to measure its displacement every 1mm spacing and obtains.Then, each sample is all obtained to poor by the maximum value of the displacement obtaining after this measured value slant correction (Slant correction) and minimum value, and using the mean value of this value as planeness.Judgement criteria is as follows.
◎: be less than 4 μ m
Zero: 4 μ m is above and be less than 10 μ m
△: 10 μ m are above and be less than 20 μ m
*: more than 20 μ m
-workability (process period)-
The attrition process time of take in embodiment 1 has been carried out relative evaluation to attrition process required time as benchmark.Judgement criteria is as follows.
◎: with respect to embodiment 1, the increase of process period is less than 5%
Zero: with respect to embodiment 1, the increase of process period is more than 5% and be less than 10%
△: with respect to embodiment 1, the increase of process period is more than 10% and be less than 15%
*: with respect to embodiment 1, the increase of process period is more than 15%
Claims (5)
1. a glass blank, is characterized in that, has:
Discoideus thin plate part; With
Slab portion, it is configured to respect to the two sides of described thin plate part, form protuberance along the outer periphery portion of this thin plate part,
The radial width of the described protuberance with respect to the diametric(al) of described thin plate part in a face side, is greater than the radial width of the described protuberance in another face side.
2. a glass blank manufacture method, is characterized in that,
As a pair of shaping dies that is configured to can relatively move with respect to vertical direction, use the first shaping dies and the second shaping dies, and at least through any one suppression process of selecting, manufacture glass blank from the first suppression process and the second suppression process
Described the first shaping dies possesses press face, and wherein, this press face when press molding and the glass contact of soft state, and has circular central part and to form the mode of recess with respect to described central part, is arranged on the outer edge of the perimeter sides of this central part,
Described the second shaping dies possesses press face, wherein, this press face is when press molding and the glass contact of soft state, and there is diameter than the also little circular central part of the central part of described the first shaping dies and to form the mode of recess with respect to this central part, be arranged on the outer edge of the perimeter sides of this central part
In described the first suppression process, using the shaping dies that is configured in vertical direction lower side as described the first shaping dies, using the shaping dies that is configured in vertical direction upper side as described the second shaping dies, and after in the press face that the glass block of soft state is configured to described the first shaping dies, utilize the press face of described the first shaping dies and the press face of the second shaping dies, so that described glass block arrives the mode of outer edge of the press face of described the first shaping dies, described glass block is suppressed
In described the second suppression process, using the shaping dies that is configured in vertical direction lower side as described the second shaping dies, using the shaping dies that is configured in vertical direction upper side as described the first shaping dies, and after in the press face that the glass block of soft state is configured to described the second shaping dies, utilize the press face of described the first shaping dies and the press face of the second shaping dies, so that described glass block arrives the mode of outer edge of the press face of described the first shaping dies, described glass block is suppressed.
3. glass blank manufacture method as claimed in claim 2, is characterized in that,
To be the glass of roughly tabular soft state after described suppression process, implement to utilize at least one method in method (1) and method (2) to suppress to produce the warpage inhibition operation of warpage, wherein, described method (1) refers to: apply the temporary transient warpage producing of the mandatory correction of external force method, be that warpage is proofreaied and correct compacting, described method (2) refers to: the cooling conditions of the upper and lower surface of the soft state glass that prevents from being roughly tabular after just compacting departs from, and with roughly the same condition, described upper and lower surface is carried out to cooling method.
4. a substrate for information recording medium manufacture method, is characterized in that,
At least through the two sides of glass blank being carried out to the operation of attrition process and/or polishing, carry out manufacturing information recording medium substrate, wherein, described glass blank is any one glass blank of selecting in the glass blank described in Accessory Right requirement 1 and the glass blank that produces by the glass blank manufacture method described in claim 2 or 3.
5. an information recording medium manufacturing method, is characterized in that,
At least through information recording layer, form operation and carry out manufacturing information recording medium, wherein, described information recording layer formation operation is on the major surfaces of the substrate for information recording medium producing by substrate for information recording medium manufacture method claimed in claim 4, to form the operation of information recording layer.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009214715A JP5449938B2 (en) | 2009-09-16 | 2009-09-16 | Glass blank, glass blank manufacturing method, information recording medium substrate manufacturing method, and information recording medium manufacturing method |
| JP2009-214715 | 2009-09-16 | ||
| PCT/JP2010/065783 WO2011034037A2 (en) | 2009-09-16 | 2010-09-14 | Glass blank, glass blank manufacturing method, manufacturing method for substrate for information recording medium, and manufacturing method for information recording medium |
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| Publication Number | Publication Date |
|---|---|
| CN102625782A CN102625782A (en) | 2012-08-01 |
| CN102625782B true CN102625782B (en) | 2014-11-05 |
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| JP (1) | JP5449938B2 (en) |
| CN (1) | CN102625782B (en) |
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| CN102603161B (en) * | 2012-03-27 | 2014-06-11 | 四川钟顺太阳能开发有限公司 | Production method of lens array blank, production method of lens array, and lens array |
| US10578234B2 (en) | 2013-05-02 | 2020-03-03 | Victaulic Company | Coupling having arcuate stiffness ribs |
| US10859190B2 (en) | 2016-05-16 | 2020-12-08 | Victaulic Company | Sprung coupling |
| US10533688B2 (en) | 2016-05-16 | 2020-01-14 | Victaulic Company | Coupling having tabbed retainer |
Citations (1)
| 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 |
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| JP3714501B2 (en) * | 1997-01-08 | 2005-11-09 | Ｈｏｙａ株式会社 | Thin plate glass and method for producing the same |
| JPH11189423A (en) * | 1997-12-26 | 1999-07-13 | Ngk Insulators Ltd | Production of glass base plate |
| AU6390101A (en) * | 2000-05-11 | 2001-11-20 | Bonitz, Ralf | Method and device for producing thin discoid glass blanks by pressing |
| JP4127974B2 (en) * | 2001-01-29 | 2008-07-30 | Ｈｏｙａ株式会社 | Substrate blank, substrate, and information recording medium manufacturing method |
| JP4133091B2 (en) * | 2002-08-02 | 2008-08-13 | Ｈｏｙａ株式会社 | Glass blank, information recording medium substrate, and information recording medium manufacturing method |
| JP4249477B2 (en) * | 2002-12-26 | 2009-04-02 | Ｈｏｙａ株式会社 | Glass blank and method for manufacturing the same, method for manufacturing substrate for information recording medium, method for manufacturing information recording medium |
| JP4857571B2 (en) * | 2005-02-15 | 2012-01-18 | コニカミノルタオプト株式会社 | Method for manufacturing glass substrate for magnetic recording medium |
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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 |
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| CN102625782A (en) | 2012-08-01 |
| WO2011034037A3 (en) | 2011-05-05 |
| WO2011034037A2 (en) | 2011-03-24 |
| JP5449938B2 (en) | 2014-03-19 |
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| MY156912A (en) | 2016-04-15 |
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