CN1259653C - Magnetic duplication method and duplicator thereof - Google Patents
Magnetic duplication method and duplicator thereof Download PDFInfo
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- CN1259653C CN1259653C CNB021032610A CN02103261A CN1259653C CN 1259653 C CN1259653 C CN 1259653C CN B021032610 A CNB021032610 A CN B021032610A CN 02103261 A CN02103261 A CN 02103261A CN 1259653 C CN1259653 C CN 1259653C
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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
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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
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
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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
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
- G11B5/739—Magnetic recording media substrates
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2508—Magnetic discs
- G11B2220/2516—Hard disks
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Abstract
The present invention relates to a magnetic transfer method. After a magnetic field is applied to the slave face in the track direction thereof to initially magnetize the slave medium in the track direction, the master medium and the slave medium are brought into close contact. When applying a transfer magnetic field in the track direction of the slave face to perform a magnetic transfer, the magnetic field intensity component in the direction opposite that in which the transfer magnetic field is to be applied is regulated to less than or equal to 1/2 the magnetic coercive force Hcs of the slave medium over the entire slave surface. A plurality of slave mediums are prepared, said plurality of slave mediums are stacked so that the center of the track of each of said plurality of slave mediums is aligned, a direct current magnetic field is applied in the track direction of said plurality of slave mediums, which are in the stacked state, to concurrently initially magnetize said plurality of slave mediums; whereby a plurality of the slave mediums that have been initially magnetized in the track direction are formed.
Description
Technical field
The present invention relates to a kind of magnetic duplication that utilizes from the master carrier of carrying information magnetic duplication method and magnetic duplication device to the subordinate medium.
Background technology
In magnetic recording medium usually, along with the increase of quantity of information wishes to obtain writing down the high capacity low price of high capacity information, more desirably can read the place that needs, the medium that so-called zero access is possible in the short time.As their example is known hard disk and high density floppy disk etc. are arranged, in order to realize this high capacity, magnetic head must carry out correct scanning to narrow magnetic track, and than recovering signal, so-called tracking servo technology is being undertaken very big effect with high S/N.In a week of disk, record servosignal, the address information signal of following the tracks of usefulness at certain intervals, go back so-called preformat such as original clock signal.
Magnetic head just may correctly move on magnetic track by the position of reading this preformat signal correction oneself.Present preformat is with special-purpose servo pen recorder disk to be formed one by one and by magnetic track ground record.
But servo pen recorder is the price height not only, and during preformatting the used time long, thereby this operation becomes manufacturing cost most, so just wish to reduce this cost.
On the other hand, also proposed not adopt to write preformat, but realized the method for preformat by magnetic duplication method by magnetic track.
Magnetic duplication method is to make master carrier and subordinate medium under the state of being adjacent to, and the master carrier is applied duplicate with magnetic field duplicating with the corresponding magnetizing pattern of carrying information (as servosignal) of producing.As this magnetic duplication method, announce just like [spy opens clear 63-183623 communique], [spy opens flat 10-40544 communique], [spy opens flat 10-269566 communique] etc.This magnetic duplication, as having a relief pattern master carrier for the information of at first being prepared by the subordinate media such as magnetic disk media of magnetic duplication medium Yu will duplicate is corresponding, make this master carrier and subordinate medium be in the state of being adjacent to, use magnetic field by applying to duplicate, to be replicated in the subordinate medium with the corresponding magnetic pattern of the information that relief pattern was loaded with (as servosignal) of master carrier, therefore the relative position of master carrier and subordinate medium can not change, both can undisturbedly carry out record, record preformat that also can be correct, and it is also extremely short to write down the needed time.
In addition, duplicate and use magnetic field, the master carrier is under the state that is adjacent to, in its one-sided or both sides the field generator for magnetic of being made up of electromagnet apparatus, permanent magnet device is set and applies magnetic field on the one side or the two sides of subordinate medium.At this moment, make the subordinate medium show consideration for the relative rotation of tight object or magnetic field do, and on the magnetic track on the discoid subordinate medium circumference, duplicate magnetized pattern with master.
; in above-mentioned magnetic duplication method; for the accurate magnetizing pattern of correspondence of the Copy Info that magnetosphere the is formed relief pattern institute that is loaded with face in the information of master carrier; duplicated record is to the record surface of subordinate medium and improve accuracy of repetition, and the heterotopic faces that must make the information of master carrier be loaded with face and subordinate medium is guaranteed to use magnetic field for the state of being adjacent to accurately applies to duplicate in track direction.
But, the magnetic field that actual field generator for magnetic produces, it is difficult that all scopes from the interior perimembranous of subordinate medium to peripheral part only apply the magnetic field parallel with track direction, can produce stray field around.Thisly duplicate intensity with the stray field in magnetic field when big, at the regular magnetizing pattern of subordinate medium duplicated record disorder finally can't be carried out the good magnetic duplication of precision through duplicating with magnetic field, Copy Info is followed the tracks of function during for servosignal can't give full play to the low problem of reliability that produces.
Particularly, for the subordinate medium that records magnetizing pattern, though magnetizing pattern can be not disorderly when not applying the magnetic field of intensity of its coercive force Hcs degree, but when being loaded with face and being adjacent to the information of relief pattern with duplicating of having of master carrier, discovery will produce gathering because of relief pattern magnetic field, as long as the magnetic field intensity of 1/2 degree of coercive force Hcs is arranged, magnetizing pattern also can be disorderly.
The present invention proposes in view of this problem, its purpose is, a kind of magnetic duplication method and magnetic duplication device are provided, master carrier and subordinate medium are adjacent to apply and duplicate when carrying out magnetic duplication with magnetic field, regulation and the allowed band of duplicating with the stray field of the backward-acting that applies direction in magnetic field can be carried out duplicating of correct magnetizing pattern.
In addition, the inventor, during the magnetic duplication stated on the implementation, found to realize desirable more high-grade magnetic duplication behind the subordinate medium initial magnetization in advance, in [special be willing to flat 11-117800 number], proposed the subordinate medium applied after fixed initial stage D.C. magnetic field carries out initial magnetization, the master carrier is adjacent to, by apply initial magnetization direction therewith reverse duplicate method and the device that carries out magnetic duplication with magnetic field.But owing to need to carry out the subordinate medium in advance the operation of initial magnetization, more than the operation of original magnetic duplication, the result has increased time and cost.Therefore, wish manufacturing process's simplification, cost degradation.
In view of the foregoing, the purpose of this invention is to provide realization manufacturing process and simplify the magnetic duplication method of cost degradation.
Summary of the invention
Magnetic duplication method of the present invention, the magnetic recording medium of the subordinate medium that the main disk carrier for magnetic duplication that will be formed by magnetosphere in the part of the information signal on counterpart substrate surface and accepting duplicates is adjacent to and applies the magnetic duplication method that duplicates with magnetic field, it is characterized by track direction at heterotopic faces apply magnetic field in advance to the subordinate medium after track direction is carried out initial magnetization, the subordinate medium that master carrier and above-mentioned initial magnetization are crossed is adjacent to, apply to duplicate in the track direction of heterotopic faces and use magnetic field, when carrying out magnetic duplication, with duplicate backing field intensity with the above-mentioned track direction in magnetic field in the record surface of subordinate medium is region-wide less than 1/2 of the coercive force Hcs of subordinate medium.
The above-mentioned above-mentioned magnetospheric desirable coercive force Hcm of usefulness master carrier that duplicates is less than 48kA/m ( 600Oe).
In addition, desirable above-mentioned subordinate medium is discoid magnetic recording mediums such as hard disk, floppy disk.
And desirable above-mentioned initial magnetization direction and the above-mentioned direction that applies of duplicating with magnetic field are roughly reverse.As above-mentioned information signal is best with the servosignal.
Magnetic duplication device of the present invention in addition, the magnetic recording medium of the subordinate medium that has the main disk carrier for magnetic duplication that will be formed by magnetosphere in the part of the information signal on counterpart substrate surface and accept to duplicate is adjacent to and applies the magnetic duplication device that duplicates with magnetic field, it is characterized by the track direction that has the subordinate medium that is adjacent to the master carrier and apply the field generator for magnetic that duplicates with magnetic field, with duplicating of producing of this field generator for magnetic with the reverse magnetic field intensity of the above-mentioned track direction in magnetic field at 1/2 of the region-wide coercive force Hcs less than the subordinate medium of subordinate medium recording face.
As applying the above-mentioned field generator for magnetic that duplicates with magnetic field,, consider to wish to use electromagnet apparatus from setting the condition of adjusting aspects such as magnetic field intensity though can use electromagnet apparatus or permanent magnet device.
The above-mentioned magnetospheric desirable coercive force Hcm of above-mentioned master carrier is less than 48kA/m ( 600Oe).
Desirable above-mentioned subordinate medium is discoid magnetic recording mediums such as hard disk, floppy disk.
Discoid magnetic recording medium is carried out the situation of the device of magnetic duplication, desirable above-mentioned field generator for magnetic is to produce the device in the magnetic field parallel with track direction in the scope that the radial direction along above-mentioned subordinate medium extends, and is that the device that above-mentioned subordinate medium and above-mentioned master carrier are adjacent to reaches the device that comprehensively carries out magnetic duplication that is rotated in above-mentioned subordinate medium by relative above-mentioned field generator for magnetic.
Magnetic duplication device of the present invention wishes that further the magnetization of above-mentioned subordinate medium is had the initial magnetization device that carries out initial magnetization along track direction.
That is to say in magnetic duplication device of the present invention, usually wish, by the initial magnetization device, at first the subordinate medium is implemented the initial magnetization of dc magnetization in track direction, this subordinate medium and corresponding with the Copy Info master carrier that forms trickle relief pattern at magnetosphere are adjacent to slightly are reverse direction with initial magnetization direction and apply to duplicate and carry out magnetic duplication with magnetic field with the subordinate medium.Is good as above-mentioned information with servosignal.
In addition, about the two sides being had the magnetic duplication of magnetospheric subordinate medium, have in the one side of subordinate medium the master carrier is adjacent to situation that single face duplicates one by one and respectively the master carrier is adjacent to the situation that duplicate simultaneously on the two sides on the two sides of subordinate medium.At this moment, the master carrier is adjacent to, field generator for magnetic is set in its one-sided or both sides applies to duplicate and use magnetic field at the one or both sides of subordinate medium.
The initial magnetization of subordinate medium, at least the magnetic field that has a magnetic field distribution more than the place in the track direction position greater than the magnetic field intensity of subordinate medium coercive force Hcs part is produced in the part of track direction, finish by subordinate medium or magnetic field are rotated along track direction.In addition, wish to make greater than the magnetic field intensity of the coercive force Hcs of subordinate medium and partly has only direction along the track direction position, reverse magnetic field intensity produces in the part of track direction in the magnetic field less than the magnetic field distribution of the coercive force of subordinate medium of arbitrary track direction position.
In addition, duplicate applying with magnetic field, the peaked magnetic field intensity that surpasses best reproducing magnetic field strength range does not all exist in any direction of magnetic track, the magnetic field intensity part that becomes in the best reproducing magnetic field strength range has at least a place to exist in a tracks direction, magnetic field less than 1/2 the magnetic field distribution of the coercive force Hcs of subordinate medium produces in the part of track direction the magnetic field intensity of reverse therewith track direction in the region-wide arbitrary track direction of the record surface of subordinate medium position, the subordinate medium that main disk carrier for magnetic duplication and initial magnetization are crossed is in the state lower edge track direction rotation that is adjacent to, or magnetic field rotated along track direction finish.0.6～1.3 times of the coercive force Hcs that best reproducing magnetic field strength range is the subordinate medium.
Other magnetic duplication methods of the present invention, with in advance at the subordinate medium of track direction initial magnetization, be adjacent to pairing this male and fomale(M﹠F) of the information that will duplicate to this subordinate medium with master carrier of relief pattern face, apply with the reverse direction of above-mentioned initial magnetization and to duplicate with in the magnetic duplication method in magnetic field, it is characterized by the subordinate medium of many of preparations, the center of the magnetic track of each subordinate medium of this subordinate medium of many is adjusted under the consistent overlap condition, apply the initial stage D.C. magnetic field in the track direction of this subordinate medium many above-mentioned subordinate media are carried out initial magnetization simultaneously, make above-mentionedly to generate simultaneously many of the subordinate medium of track direction initial magnetization in advance.
In addition, when the subordinate medium is floppy disk, both can have adorned and stick dish and carry out initial magnetization behind the core, and also can adorn and carry out before pasting.Especially, wish the floppy disk punching and shaping after, the state that keeps overlapping on the storage rack many carries out initial magnetization.In addition, in this case, the surface smoothness of wishing each floppy disk is R＞1.5nm.
By above-mentioned the present invention, since the part of the carrying out magnetic duplication magnetic field intensity reverse with applying the track direction of duplicating with magnetic field in the record surface of subordinate medium is region-wide less than 1/2 of the coercive force Hcs of subordinate medium, even be adjacent to the magnetic field gathering that relief pattern causes so have, also can not be subjected to the influence of stray field to produce duplicating of the magnetizing pattern disorder can have the homogeneous characteristic in the gamut of subordinate medium correct magnetizing pattern, can guarantee when being servosignal that good tracking function improves reliability.
In addition, when constituting the magnetic duplication device, the stray field intensity of magnetic duplication with magnetic field is defined in the above-mentioned allowed band, can carries out good magnetic duplication, the design of therefore installing the magnetic field intensity, distribution etc. of all assembly precisions, field generator for magnetic just becomes easy.
By magnetic duplication method of the present invention, prepare many subordinate medium, the center of the magnetic track of each subordinate medium of this subordinate medium of many is adjusted under the consistent overlap condition, apply the initial stage D.C. magnetic field in the track direction of this subordinate medium many above-mentioned subordinate media are carried out initial magnetization simultaneously, make and above-mentionedly generate simultaneously many of the subordinate medium of track direction initial magnetization in advance, that is to say, once accomplished the initial magnetization of many subordinate medium, therefore, the manufacturing time of the subordinate medium after the preformat can shorten, and equipment also can be simplified.Thus, in the magnetic duplication method of realizing more high-grade magnetic duplication, can accomplish cost degradation.
Description of drawings
Fig. 1 is the stereographic map at the main position of the magnetic duplication device of enforcement magnetic duplication method among a kind of embodiment of the present invention.
Fig. 2 duplicates the vertical view of the standard of the stray field intensity of using magnetic field for expression.
Fig. 3 is the sketch map of other embodiment of expression field generator for magnetic.
Fig. 4 is the basic working procedure figure of expression magnetic duplication method.
Fig. 5 is the main position stereographic map of the field generator for magnetic that is used for magnetic duplication method of other embodiment of the present invention.
Fig. 6 is the exploded perspective view of subordinate stationary installation.
Fig. 7 duplicates with the exploded perspective view that is adjacent to device for the two sides.
Fig. 8 duplicates with the exploded perspective view that is adjacent to device for one side.
Fig. 9 is the stereographic map that clump belongs to the medium storage rack.
Among the figure, 1-magnetic duplication device; The 2-clump belongs to medium; The 3-main carrier; The 5-field generator for magnetic; The 10-clump belongs to stationary installation; 20,20 '-be adjacent to device; 21-circumference magnetic track; The 32-magnetosphere; The 37-storage rack; The 50-electromagnet apparatus; The D-track direction; D-stray field composition.
Embodiment
Below, explain embodiments of the invention.Fig. 1 is the stereographic map at the main position of the magnetic duplication device of enforcement magnetic duplication method among a kind of embodiment of the present invention.Fig. 2 is the synoptic diagram that duplicates the standard of the stray field of using magnetic field, and Fig. 3 is the synoptic diagram of the basic working procedure of magnetic duplication method for sketch map, Fig. 4 of other embodiment of expression field generator for magnetic.In addition, it is disproportionate that each figure is the actual size of synoptic diagram and each several part.
In the magnetic duplication device 1 of Fig. 1, when magnetic duplication, the heterotopic faces (magnetic recording face) with the subordinate medium 2 (magnetic recording medium) behind the initial magnetization described later is loaded with face with the information of master carrier 3 and contacts, with fixed pressure it is adjacent to.Under the state that is adjacent to of this subordinate medium 2 and master carrier 3, apply magnetization patterns such as duplicating usefulness magnetic field duplicated record servosignal by field generator for magnetic 5.
In addition, subordinate medium 2 is carried out initial magnetization in advance.This initial magnetization, the magnetic field that will have the magnetic field distribution more than the place at least in the track direction position greater than the magnetic field intensity part of subordinate medium 2 coercive force Hcs, be desirably, magnetic field intensity part greater than subordinate medium 2 coercive force Hcs only has a direction in the track direction position, reverse magnetic field intensity is in the part of arbitrary track direction position in track direction, generation is carried out the initial magnetization (dc erasing) of full magnetic track less than the magnetic field of the magnetic field distribution of the coercive force of subordinate medium 2 by making subordinate medium 2 or magnetic field along the track direction rotation.
Apply the field generator for magnetic 5 that duplicates with magnetic field, have the electromagnet apparatus 50,50 that on the magnetic core 52 that both sides are provided with up and down, is wound with coil 53 in the gap 51 that the radial direction that is adjacent to subordinate medium 2 that device keeps and master carrier 3 extends, apply the duplicating of magnetic line of force G (with reference to Fig. 2) parallel in both sides up and down with same direction and use magnetic field with track direction.
When applying magnetic field, make subordinate medium 2 and the continuous integratedly rotation of master carrier 3 formation apply to duplicate and use magnetic field, the Copy Info magnetic duplication of master carrier 3 is recorded the heterotopic faces of subordinate medium 2 by field generator for magnetic 5.Also field generator for magnetic 5 can be set to rotate move mode.
Duplicate and use magnetic field, surpass the peaked magnetic field intensity of best reproducing magnetic field strength range (the coercive force Hcs of subordinate medium 2 0.6～1.3 times) and all do not exist in track direction, the magnetic field intensity part in the best reproducing magnetic field strength range has more than the place at least in a tracks direction.In addition, the arbitrary track direction position of the magnetic field intensity of reverse therewith track direction in the record surface of subordinate medium is region-wide is all less than 1/2 of the coercive force Hcs of subordinate medium.
Just, observe on plane as shown in Figure 2, for the circumference magnetic track 21 that the concentric circles by subordinate medium 2 forms, the direction of the magnetic line of force G that produces in the gap 51 of field generator for magnetic 5 applies to duplicate along track direction D uses magnetic field.D is a circumferencial direction because of this track direction, the magnetic track 21 of the opposition side position of center line (lower position among the figure) shown in solid line with plane observation becoming reverse direction, the magnetic tracks 21 of 90 degree positions (position, the left and right sides of figure) become orthogonal directions.In addition, the stray field that the part in the gap beyond 51 produces, with ingredient d shown in the reverse dotted line of above-mentioned track direction D in the record surface of subordinate medium 2 is region-wide, regulation makes it less than 1/2 of the coercive force Hcs of subordinate medium 2.Narration is duplicated the reason that is defined as above-mentioned scope with the stray field intensity in magnetic field with this below.
Above-mentioned field generator for magnetic 5 also can be only in one-sided setting.In addition, as other embodiments of field generator for magnetic 5, shown in Fig. 3 (a)～(c), also the electromagnet apparatus or the permanent magnet device that generation can be duplicated with magnetic field is arranged on both sides or one-sided.
The field generator for magnetic 5 of Fig. 3 (a) is made of the opposite magnetic pole of the both sides parallel with heterotopic faces of an electromagnet 55 (or permanent magnet) that extends along the radial direction of subordinate medium 2, produces magnetic field in track direction.The field generator for magnetic 5 of Fig. 3 (b), by with the end face of two parallel electromagnet 56,57 (or permanent magnets) of extending at the radial direction of subordinate medium 2 of fixed interval constitute towards the opposite magnetic pole of heterotopic faces, produce magnetic field in track direction.The field generator for magnetic 5 of Fig. 3 (c) is made of the opposite magnetic pole towards two parallel end faces of heterotopic faces of the cross section permanent magnet 58 (or electromagnet) that to be the U type extend along radial direction, produces magnetic field in track direction.
In the field generator for magnetic 5 of the various embodiments described above, the regular magnetic field applying portion that produces with field generator for magnetic 5 apply the reverse stray field intensity of track direction of duplicating with magnetic field, also be defined as less than 1/2 of coercive force Hcs at the region-wide of record surface of subordinate medium 2.
Secondly, Fig. 4 is the basic working procedure figure of expression magnetic duplication method.(a) being to apply magnetic field in a direction subordinate medium 2 is carried out the mode of initial magnetization, (b) is the operation of master carrier 3 and subordinate medium 2 being pressed close in the opposite direction to apply magnetic field, (c) is each the local state synoptic diagram behind the magnetic duplication.
Shown in Fig. 4 (a), at first subordinate medium 2 is applied along the unidirectional initial D.C. magnetic field Hin of track direction and carry out initial magnetization (initial dc magnetization) in advance, then, shown in Fig. 4 (b), the information of the heterotopic faces (magnetic recording face) of subordinate medium 2 and the magnetosphere that is covered with trickle relief pattern 32 of the substrate 31 of master carrier 3 is loaded with face is adjacent to, apply with rightabout the duplicating of above-mentioned initial D.C. magnetic field Hin in the track direction of subordinate medium 2 and carry out magnetic duplication with magnetic field H du.Its result shown in Fig. 4 (c), goes up at the heterotopic faces (magnetic track) of subordinate medium 2 that information with master carrier 3 is loaded with the protuberance that is adjacent to of magnetosphere 32 of face and the corresponding magnetizing pattern of formation pattern of the recess vacated just is replicated record.
In addition, even the relief pattern of the substrate 31 of above-mentioned master carrier 3 is the negative-appearing image pattern of the concaveconvex shape opposite with the erect image pattern of Fig. 4, direction by initial D.C. magnetic field Hin and duplicate direction with magnetic field H du and be set on the contrary with above-mentioned direction also can obtain same magnetizing pattern duplicated record.
When aforesaid substrate 31 was ferromagnetism bodies such as Ni, though as long as there is this substrate 31 just can carry out magnetic duplication, the above-mentioned magnetosphere 32 that is not covered was good, and the magnetosphere 32 that has good duplication characteristic by setting can carry out better magnetic duplication.When substrate 31 is nonmagnetic material, magnetosphere 32 must be set.The magnetosphere 32 of master carrier 3, desirable coercive force Hcm are the soft ferromagnetic layer less than 48kA/m ( 600Oe).
Substrate 31 as master carrier 3 can use nickel, silicon, quartz plate, glass, aluminium, alloy, pottery, synthetic resin etc.The formation of relief pattern can be undertaken by impression (stamper) method, photo-etching etc.
Stamped method, it is the last formation photoresists such as rotating the gluing method of using of glass plate (or quartz plate) at surface smoothing, use the modulated laser corresponding (or electron beam) to shine when making this glass plate rotation with servosignal, photoresist comprehensive fixed pattern, expose at counterpart as being the pattern that is equivalent to servosignal each frame on circumference that wire extends from rotation center to radial direction at each magnetic track.Afterwards, photoresist developing is handled, removed exposed portion and obtain the former dish that forms by photoresist with concaveconvex shape.Secondly,, this surface is implemented to electroplate (electroforming), make Ni substrate, peel off from former dish with erect image relief pattern based on the relief pattern of former panel surface.Or like this this substrate as the master carrier, or the soft ferromagnetic layer that optionally is covered on relief pattern, diaphragm are made the master carrier.
In addition, above-mentioned former dish implemented to electroplate make the 2nd former dish, electroplate with this 2nd former dish, the substrate of relief pattern of making negative-appearing image is good.In addition, to the 2nd former dish or implement to electroplate or press resin liquid and be cured and make the 3rd former dish, the 3rd former dish is implemented to electroplate, it is good to make the substrate with erect image relief pattern.
In addition, after above-mentioned glass plate forms pattern by photoresist, form the hole with etching method on glass plate, next the former dish of the photoresist that is removed equally also can form substrate with said method.
As the material of metal substrate, can use Ni or Ni alloy, make the above-mentioned plating of this substrate, the various metals that comprise electroless plating, electroforming, sputter, ion plating become embrane method all applicable.The degree of depth of the relief pattern of substrate (height of projection), the scope of 80nm～800nm is for satisfied, and better is 100nm～600nm.When this relief pattern is servosignal, form strip at radial direction.Such as, the length that is desirably radial direction is that 0.05～20 μ m, circumferencial direction are 0.05～5 μ m, selecting the long pattern of radial direction in this scope is desirable as the pattern that is loaded with servosignal.
The formation of above-mentioned magnetosphere 32 (soft ferromagnetic layer) is by vacuum vapour deposition, sputtering method, ion plating equal vacuum film formation device, through formation such as plating film magnetic material.As magnetospheric magnetic material, can use Co, Co alloy (CoNi, CoNiZr, CoNbTaZr etc.), Fe, Fe alloy (FeCo, FeCoNi, FeNiMo, FeAiSi, FeAl, FeTaN), Ni, Ni alloy (NiFe).Wherein, FeCo, FeCoNi are even more ideal.Magnetospheric thickness, the scope of 50nm～500nm is advisable, and 100nm～400nm is better.
In addition, wish on magnetosphere, to be provided with diaphragm such as DLC, that lubricant layer is set is good.Have again that the two all exists just more satisfied as diamond-like carbon (DLC) film of diaphragm 5～30nm and lubricant layer.In addition, between magnetosphere and the diaphragm, being provided with Si etc., to be adjacent to strengthening layer good.Lubricant, revise with process that the subordinate medium contact in produce deviation the time, can improve the deterioration of the permanance that causes owing to the friction injury of generation etc.
Make resin substrate with above-mentioned former dish, it is good as the master carrier that its surface is provided with magnetosphere.As the resin material of resin substrate, can use vestolit, epoxy resin, amorphous polyolefin and the polyester etc. of acryl resin, Polyvinylchloride vinyl chloride copolymers etc. such as polycarbonate polymethylmethacrylate.Consider that from aspects such as moisture resistivity, dimensional stability and prices polycarbonate is desirable.When jagged, remove on the mechanograph by polishing or polishing.In addition, use ultraviolet curable resin, electronics line cured resin etc., also can form with rotary coating, bar coating at former dish.The rising height of the pattern of resin substrate is advisable in the scope of 50～1000nm, and the scope of 100～500nm is better.
The lining magnetosphere obtains the master carrier on the fine pattern on the surface of above-mentioned resin substrate.Magnetospheric formation utilizes vacuum vapour deposition, sputtering method, ion plating equal vacuum film formation device, by electrochemical plating etc. magnetic material is formed film.
In addition, photo-etching, such as, at the smooth surface of flat-shaped substrate coating photoresist, by exposure, the development treatment with the photomask of the pattern of corresponding servosignal, the pattern of formation corresponding informance.Secondly, by photo-mask process, corresponding pattern is carried out photoetching to substrate, forms the hole of the degree of depth suitable with magnetospheric thickness.Secondly, utilize vacuum vapour deposition, sputtering method, ion plating equal vacuum film formation device, the thickness by the corresponding hole that forms of electrochemical plating to the surface of substrate forms film to magnetic material.Secondly, remove photoresist with the method for peeling off, lapped face is when removing when jagged, level and smooth with surface finish.
As subordinate medium 2, use discoid magnetic recording mediums such as hard disk, high density floppy disk, its magnetic recording layer is formed by application type magnetic recording layer or metal foil membranous type magnetic recording layer.As the magnetic material of metal foil membranous type magnetic recording layer, can use Co, Co alloy (CoPtCr, CoCr, CoPtCrTa, CoPtCrNbTa, CoCrB, CoNi etc.), Fe, Fe alloy (FeCo, FePt, FeCoNi).This is because magnetic density is big, has and the magnetic anisotropy that applies magnetic direction equidirectional (being direction in the face when writing down in the face), can duplicate clearly, so be desirable.Following (the supporting side) of magnetic material wishes to be provided with the non-magnetic substrate layer in order to increase necessary magnetic anisotropy in addition.Crystal structure and grating constant are matched with magnetosphere.Therefore use Cr, CrTi, CoCr, CrTa, CrMo, NiAl, Ru etc.
At this, the stray field intensity of duplicating with magnetic field is described in the experimental result of above-mentioned scope.The master carrier that uses in the experiment, subordinate medium and magnetic duplication method are as follows.
The making of master carrier
By the Ni stamped method, the position of 20～40mm from the disc centre to the radial direction, with the uniformly-spaced radioactive ray of fabric width 0.5 μ m, radial direction be interior all positions of 20mm make line be spaced apart 0.5 μ m the interval, make the Ni substrate of dark 0.2 μ m with discoid pattern.About vacuum coater, at room temperature be decompressed to 1.33 * 10
-5Pa (10
-7Torr) after, import argon gas at 0.4Pa (3 * 10
-3Torr) under the condition, on the Ni basal disc, form the FeCo film (soft ferromagnetic layer) of thick 200nm, make the master carrier.Coercive force Hcm is 8kA/m (100Oe), and magnetic flux density Ms is 28.9T (23000Gauss).
The making of subordinate medium
At vacuum coater, after at room temperature being depressurized to, 1.33 * 10
-5Pa (10
-7Torr) after, import argon gas at 0.4Pa (3 * 10
-3Torr) under the condition, heating glass plate to 200 ℃ is made CrTi 60nm, CoCrPt 25nm, magnetic flux density Ms are that 5.7T (4500Gauss), coercive force Hcs are 3.5 o'clock discoid magnetic recording mediums of type (hard disk) of 199kA/m (2500Oe).
The magnetic duplication experimental technique
Make the surface of peak field intensity, be 2 times the 398kA/m (5000Oe) of subordinate medium coercive force Hcs, ring-type magnetic head electrical magnet as shown in Figure 1 is set, carry out the initial magnetization of subordinate medium at the subordinate medium.Next is showing consideration for tightly subordinate medium and master behind the initial magnetization, adjusts ring-type magnetic head current of electromagnet, and making peak field intensity is 207kA/m (2600Oe) on the surface of subordinate medium.
At this moment, change the interval of power-on and power-off magnet, make reproducing magnetic field intensity remain on 207kA/m (2600Oe) always, only change stray field intensity.The stray field intensity reverse with duplicating direction becomes the strongest part, be the interior all positions that apply the direction of position and 180 ° at the reproducing magnetic field that with the center symmetric points, shown in following table 1, the interval of the above-below direction of power-on and power-off magnet changed at 20～40mm correspondingly adjust electric current from 18A to 40A, making reverse stray field intensity in this position is that 40kA/m (500Oe), 64kA/m (800Oe), 96kA/m (1200Oe), 199kA/m (1500Oe) change and carry out magnetic duplication.In addition, being adjacent to of master carrier and subordinate medium is that pressurization realizes on the aluminium sheet of rubber slab clipping.
The electromagnetic conversion characteristic evaluation method
(the system SS-60 of coelectron society) estimates the reproducing signals of subordinate medium by the electromagnetic conversion characteristic determinator.Magnetic head has used the reproduce head gap: 0.24 μ m, regenerative track fabric width: 1.9 μ m, write head gap: 0.4 μ m, recording track fabric width: the MR magnetic head of 2.4 μ m.To read in signal and decompose frequency, poor (C/N) of the peak strength C of measurement fundamental signal and the media noise N of extrapolation with spectrum analyzer.Value when being 40kA/m (500Oe) with stray field intensity is 0dB, and (Δ C/N) estimates with relative value.This relative value (Δ C/N) is during less than-6dB (to negative reverse increase), and signal intensity diminishes to become and duplicates defective mode, is that permissible value is estimated with this value therefore.It the results are shown in Table 1.
Table 1:
| The interval of power-on and power-off magnet (mm) | Electromagnet current (A) | Reproducing magnetic field intensity (kA/m) | Stray field intensity (kA/m) | ΔC/N (dB) | |
| Embodiment 1 | 20 | 18 | 207 | 40 | 0(○) |
| | 25 | 21 | 207 | 64 | -0.8(○) |
| | 30 | 27 | 207 | 96 | -1.5(○) |
| Comparative example 1 | 40 | 40 | 207 | 119 | -6.1(×) |
As can be known from Table 1, in the comparative example 1 that is spaced apart 40mm, stray field intensity is 119kA/m (1500Oe) greater than 1/2 of the coercive force Hcs:199kA/m (2500Oe) of subordinate medium is 100kA/m (1250Oe), and the result is bad for duplicating.In contrast to this, realized good duplicating in embodiment 1～embodiment 3 stray field intensity less than 1/2 of the coercive force Hcs of subordinate medium.Its result, proved with duplicate with the reverse stray field intensity of magnetic field intensity the record surface of subordinate medium is region-wide should be less than 1/2 the necessity of the coercive force Hcs of subordinate medium.
Below, about more specifically being illustrated applying initial D.C. magnetic field and duplicating in the magnetic duplication method of other embodiment of the present invention with magnetic field.Fig. 5, it is the main position stereographic map that produces initial D.C. magnetic field and duplicate the some magnet arrangement 5 (5a, 5b) of the field generator for magnetic of using magnetic field, Fig. 6 is the exploded perspective view of stationary installation 10 (hereinafter referred to as subordinate stationary installation 10) of subordinate medium that fixedly applies the plural number of initial D.C. magnetic field, and Fig. 7 and Fig. 8 apply to duplicate with the subordinate medium in magnetic field and the exploded perspective view that is adjacent to device 20 (20 ') of master carrier.
As shown in Figure 5, subordinate stationary installation and 10 is adjacent to device 20 (20 '), is arranged between electromagnet apparatus 5a, the 5b, is respectively the axle rotation with the center, is applied in magnetic field.
As shown in Figure 6, subordinate stationary installation 10 is made of separable top and the bottom 6,7, and inside can keep many subordinate medium 2.Subordinate medium 2, it is the floppy disk that is fixed with axle center 2b (dish core) at the central part of discoid recording medium 2a, recording medium 2a is formed with magnetospheric record surface (in addition on the two sides of the discoid basal disc that is formed by mylar of toughness etc., in above-mentioned Fig. 1, for only having represented the magnetosphere of the single face of this subordinate medium for the purpose of simple).
Central part in the bottom 7 of stationary installation 10 is formed with the center pit of the axle center 2b of subordinate medium 2 and combines the pin 8 of determining the position.By this pin 8, making many center of subordinate medium 2 consistent is that the center of magnetic track is as one man overlapping.So plural subordinate medium 2 becomes one it with the top and the bottom 6,7 of the closed subordinate stationary installation 10 of overlapping state, and the subordinate medium 2 of this subordinate stationary installation 10 and inside serves as that axle formation is driven in rotation integratedly with the center of the magnetic track of subordinate medium 2.
Near electromagnet apparatus 5a, 5b are set, make 10 rotations of subordinate stationary installation apply initial D.C. magnetic field Hin in the top and bottom of subordinate stationary installation 10, many subordinate media 2 are carried out initial magnetization along the single direction of track direction by electromagnet apparatus 5.So many subordinate medium is carried out initial magnetization simultaneously, with one by one respectively magnetization compare, in time, efficient is improved on the equipment.
In addition, the intensity of desirable initial D.C. magnetic field is the coercive force Hcs greater than the subordinate medium, and better is more than 1.2 times of Hcs.
Afterwards, each subordinate medium behind the initial magnetization and master are being shown consideration for tightly, make device 20 rotations that are adjacent to subordinate medium and master carrier apply to duplicate and use magnetic field, and the information that the relief pattern face of master carrier is loaded with magnetically is replicated and is recorded in the subordinate medium.In addition, duplicate with magnetic field to apply direction opposite with the direction of initial magnetization, desirable duplicates with magnetic field intensity to be 0.6Hcs～1.3Hcs, to be desirably 0.8Hcs～1.2Hcs again that better is 1Hcs～1.1Hcs.
Fig. 7 is the synoptic diagram that be adjacent to device 20 of two sides when duplicating simultaneously, this is adjacent to device 20, has the downside master carrier 3 that duplicates information such as servosignal at the downside record surface of subordinate medium 2, has the upside master carrier 4 that duplicates information such as servosignal at the upside record surface of subordinate medium 2, having absorption keeps downside master carrier 3 to correct the downside welded part 18 of the downside rectification parts 16 of flatness, having absorption keeps upside master carrier 4 to correct the upside welded part 19 of the upside rectification parts 17 (formation of correcting parts 16 with downside is identical) of flatness, their center is crimped, at the two sides of subordinate medium 2 downside and master carrier 3 under the state that is consistent, upside and master carrier 4 are adjacent to.
Downside is corrected parts 16 (upside is corrected parts 17 too), be designed to the size of master carrier 3 discoid accordingly, its surface design have average surface profile Ra with center line be 0.01～0.1 μ m flatness flatly by accurately machined adsorption plane 16a.At this adsorption plane 16a, about 25～100 diameters are almost opening equably less than the suction hole 16b of 2mm approximately.Though not expression among the figure, the air suction way of deriving from the outside of the inside warp-wise downside welded part 18 of correcting parts 16 at this suction hole 16b is connected with vacuum pump and is attracted, correct the flatness of this master carrier 3 at the back side of the master carrier 3 that vacuum attraction and suction surface 16a are adjacent to by adsorption plane 16a.
Downside welded part 18 and upside welded part 19 finished on-off action for discoid folk prescription or both sides are designed to move the possible switching mechanism (hold-down mechanism, locking mechanism etc.) of expression that pass through among the figure not at direction of principal axis, mutual with fixed pressure crimping.Have flange part 18a, 19a in periphery, flange part 18a, the 19a that closes when action welded part 18,19 up and down joins and makes the inner air-tight state that keeps.At the central part of downside welded part 18, matching with the center pit of the axle center 2b of subordinate medium 2 is formed with the pin 18b that determines the position.In addition, the rotating mechanism of not representing among downside welded part 18 and upside welded part 19 and the figure is driven in rotation with being connected to form one.
Subordinate medium order ground by 1 group downside master carrier 3 and 4 pairs of plural numbers of upside master carrier carries out the two sides magnetic duplication, be adjacent to device 20, the adsorption plane 16a that downside is corrected parts 16 and upside rectification parts 17 makes the center unanimity with downside master carrier 3 and upside master carrier 4 vacuum suction maintenance respectively.Then, the state of opening that separates with downside welded part 18 at upside welded part 19, after the center adjustment unanimity with subordinate medium 2, make upside welded part 19 and downside welded part 18, master carrier 3,4 is adjacent near closed.Then, move or be adjacent to moving of device 20 by power-on and power-off magnet arrangement 5, make electromagnet apparatus 5 up and down approaching at the upper and lower surface that is adjacent to device 20, make be adjacent to device 20 continuously rotation apply to duplicate by electromagnet apparatus 5 and use magnetic field, with the Copy Info of downside master carrier 3 and upside master carrier 4 magnetically duplicated record arrive the record surface of subordinate medium 2.
Fig. 8 be when carrying out simplex copying be adjacent to device 20 ' synoptic diagram, this be adjacent to device 20 ', has the downside master carrier 3 that duplicates information such as servosignal at the downside record surface of subordinate medium 2, has contact resilient body 21 (fender) at the upside record surface of subordinate medium 2, having absorption keeps the downside with rectification flatness of above-mentioned downside master carrier 3 to correct the downside welded part 18 of parts 16, has the upside welded part 19 that keeps above-mentioned elastic body 21, crimping under the consistent state is adjusted in their center, and the one side that makes subordinate medium 2 is that the opposing face and the elastic body 21 of master carrier 3 contacts is adjacent to.Just, upside master carrier 4 changes to elastic body 21 in the above-described embodiments, corrects 17 1 of the parts except upside is not set, and is same formation.
Present embodiment be adjacent to device 20 ', for the subordinate medium 2 by 3 pairs of plural numbers of a downside master carrier carries out magnetic duplication in turn, at first adjust consistent vacuum suction master carrier 3 and keep its state with the center that downside is corrected the adsorption plane 6a of parts 6.Then, the state of opening that separates with downside welded part 18 at upside welded part 19, with subordinate medium 2 and center adjust consistent after, make upside welded part 19 and downside welded part 18 master carrier 3 is adjacent near the signature power of the one side that closes at subordinate medium 2 by elastic body 11.Afterwards, with above-mentioned make equally be adjacent to device 20 ' the power-on and power-off magnet arrangement 5 of top and bottom approaching, make and be adjacent to that device 20 ' continuously rotation applies to duplicate by electromagnet apparatus 5 and uses magnetic field, the Copy Info of downside master carrier 3 is magnetically recorded the one side of subordinate medium 2.Afterwards, in another operation the another side of subordinate medium 2 and upside master carrier 4 are adjacent to and similarly carry out magnetic duplication.
In addition, at the foregoing description, as shown in Figure 6, floppy disk has many overlapping initial magnetizations that carry out together under the state that coils core 2b, as shown in Figure 9, after the floppy disk punching and shaping was shaped, piling up at storage rack 37 had under many state, such as with 60 thick overlapping 100 states of disk, it is good to carry out initial magnetization before mounting center nuclear.At the central part of storage rack 37, store subordinate medium 2 and be provided with the pin 38 of allocation really that matches with the medium pore of subordinate medium 2 in order to pile up.When carrying out initial magnetization, the lid 36 that matches with this storage rack 37 forms one, and is same with above-mentioned subordinate stationary installation 10, is set to electromagnet apparatus 5.Applying initial D.C. magnetic field by electromagnet apparatus 5, serves as that axle forms to be driven in rotation integratedly and finishes initial magnetization with the center (pin 38) of magnetic track.With compared originally be sent to subsequent processing because floppy disk is deposited under the state of storage rack 37 after punching and shaping is shaped, just can simplify working process as long as each storage rack is carried out initial magnetization.In addition, owing to do not coil core, just can overlapping more disk, the efficient height.In addition,, become difficult when overlapping disk is separated from each other, therefore set the surface smoothness Ra＞1.5nm of each disk owing to do not coil core.
In addition, enumerate the floppy disk that has illustrated as subordinate medium 2 in the above, the subordinate medium also can be the disk (hard disk) that hard disk unit has.
Claims (12)
1. the magnetic recording medium of the subordinate medium that magnetic duplication method, the main disk carrier for magnetic duplication that will be formed by magnetosphere in the part of the information signal on counterpart substrate surface and accepting duplicate is adjacent to apply to duplicate uses magnetic field,
It is characterized by track direction at heterotopic faces apply magnetic field in advance to the subordinate medium after track direction is carried out initial magnetization, subordinate medium behind master carrier and the described initial magnetization is adjacent to, apply to duplicate in the track direction of heterotopic faces and use magnetic field, when carrying out magnetic duplication, with duplicate backing field intensity with the described track direction in magnetic field in the record surface of subordinate medium is region-wide less than 1/2 of the coercive force Hcs of subordinate medium.
2. magnetic duplication method according to claim 1 is characterized by the described described magnetospheric coercive force Hcm of usefulness master carrier that duplicates less than 48kA/m.
3. magnetic duplication method according to claim 1, it is characterized by described subordinate medium is discoid magnetic recording medium.
4. magnetic duplication method according to claim 1 is characterized by described initial magnetization direction and the described direction that applies of duplicating with magnetic field is reverse.
5. magnetic duplication method according to claim 1, it is characterized by described information signal is servosignal.
6. magnetic duplication device has the main disk carrier for magnetic duplication that will be formed by magnetosphere in the part of the information signal on counterpart substrate surface and the magnetic recording medium of the subordinate medium accepting to duplicate is adjacent to apply to duplicate with magnetic field and carries out magnetic duplication,
It is characterized by the track direction that has the subordinate medium that is adjacent to the master carrier and apply the field generator for magnetic that duplicates with magnetic field, with duplicating of producing of this field generator for magnetic with the reverse magnetic field intensity of the described track direction in magnetic field at 1/2 of the region-wide coercive force Hcs less than the subordinate medium of subordinate medium recording face.
7. magnetic duplication device according to claim 6 is characterized by described field generator for magnetic, both can be that electromagnet apparatus also can be a permanent magnet device.
8. magnetic duplication device according to claim 6, the described magnetospheric coercive force Hcm that it is characterized by described master carrier is less than 48kA/m.
9. magnetic duplication device according to claim 6, it is characterized by described subordinate medium is discoid magnetic recording medium.
10. magnetic duplication device according to claim 9, described field generator for magnetic, the scope of extending at the radial direction along described subordinate medium produces the magnetic field parallel with track direction,
It is characterized by and described subordinate medium is adjacent to described master carrier and carries out magnetic duplication comprehensively by what relative described field generator for magnetic was rotated in described subordinate medium.
11. magnetic duplication device according to claim 6 is characterized by and also has the initial magnetization device that the magnetization of described subordinate medium is carried out initial magnetization in track direction.
12. magnetic duplication method, has in advance subordinate medium at the track direction initial magnetization, be adjacent to this relief pattern face of the master carrier with relief pattern face of the information correspondence that will duplicate to this subordinate medium, the direction opposite with described initial magnetization applies to duplicate uses magnetic field
It is characterized by the subordinate medium of many of preparations, the center of the magnetic track of each subordinate medium of this subordinate medium of many is adjusted under the consistent overlap condition, apply the initial stage D.C. magnetic field in the track direction of this subordinate medium described many subordinate media are carried out initial magnetization simultaneously, make and describedly generate simultaneously many of the subordinate medium of track direction initial magnetization in advance, and when carrying out magnetic duplication, with duplicate backing field intensity with the described track direction in magnetic field in the record surface of subordinate medium is region-wide less than 1/2 of the coercive force Hcs of subordinate medium.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001025675 | 2001-02-01 | ||
| JP200125675 | 2001-02-01 | ||
| JP2001047813A JP2002251724A (en) | 2001-02-23 | 2001-02-23 | Method and device for magnetic transfer |
| JP200147813 | 2001-02-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1372249A CN1372249A (en) | 2002-10-02 |
| CN1259653C true CN1259653C (en) | 2006-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021032610A Expired - Fee Related CN1259653C (en) | 2001-02-01 | 2002-02-01 | Magnetic duplication method and duplicator thereof |
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| Country | Link |
|---|---|
| KR (1) | KR20020064203A (en) |
| CN (1) | CN1259653C (en) |
-
2002
- 2002-01-31 KR KR1020020005598A patent/KR20020064203A/en not_active Application Discontinuation
- 2002-02-01 CN CNB021032610A patent/CN1259653C/en not_active Expired - Fee Related
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| CN1372249A (en) | 2002-10-02 |
| KR20020064203A (en) | 2002-08-07 |
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