WO2005086149A1 - 円筒状記録媒体の製造方法 - Google Patents
円筒状記録媒体の製造方法 Download PDFInfo
- Publication number
- WO2005086149A1 WO2005086149A1 PCT/JP2005/003472 JP2005003472W WO2005086149A1 WO 2005086149 A1 WO2005086149 A1 WO 2005086149A1 JP 2005003472 W JP2005003472 W JP 2005003472W WO 2005086149 A1 WO2005086149 A1 WO 2005086149A1
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- WO
- WIPO (PCT)
- Prior art keywords
- core
- cylindrical
- recording medium
- shape
- peripheral surface
- Prior art date
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
-
- 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
- G11B5/004—Recording on, or reproducing or erasing from, magnetic drums
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/24003—Shapes of record carriers other than disc shape
- G11B7/24006—Cylindrical or shaft-shaped
Definitions
- the present invention relates to a method for manufacturing a cylindrical recording medium having a recording film such as a magnetic recording layer, a phase change recording layer, a dye layer, and a dielectric layer formed on an inner peripheral surface.
- a recording film such as a magnetic recording layer, a phase change recording layer, a dye layer, and a dielectric layer formed on an inner peripheral surface.
- Patent Document 1 As a method for producing such a cylindrical recording medium, for example, a method disclosed in Patent Document 1 can be mentioned (hereinafter, this method is referred to as "conventional production method").
- a recording film and its protective film are first formed on both sides of a flat material, and thereafter, the flat material is processed into a cylindrical shape. It is said that a cylindrical recording medium can be manufactured.
- Patent Document 1 JP-A-9-173602
- the present invention has been made in view of, for example, the above-described problems, and has as its object to provide a method of manufacturing a cylindrical recording medium capable of manufacturing a cylindrical recording medium having excellent reliability and accuracy. I do.
- a method for manufacturing a cylindrical recording medium is a method for manufacturing a cylindrical recording medium in which a recording film is formed on an inner peripheral surface of a cylindrical base material.
- a recording film forming step of forming the recording film on the outer peripheral surface of the core, and The method includes a base material forming step of forming the base material, and a core removing step of removing the core after the base material is formed.
- the recording film is formed on the outer peripheral surface of the cylindrical or columnar core by the recording film forming step, and the base material is formed on the recording film by the base material forming step. Is formed. Thereafter, the core is removed by a core removing step.
- One embodiment of the method for manufacturing a cylindrical recording medium further includes a core forming step of forming the core.
- the core removing step includes a core deforming step of deforming the shape of the core into a shape suitable for removal.
- the core is deformed to a shape suitable for removal by the core deformation step, so that the core can be easily removed, and the cylindrical recording medium is efficiently manufactured. It becomes possible.
- the core deformation step includes a first deformation step of deforming at least a part of the core by a shading process. including.
- At least a part of the core can be deformed by the shading process, so that the range of selection of the core deforming step is widened.
- the core deformation step includes a second deformation step of deforming at least a part of the core by heat treatment.
- the core includes a heat-melting portion having a wax force, and the outer peripheral surface is formed on the heat-melting portion.
- the second deformation step includes a step of melting the heat-melted portion by the heat treatment.
- the core includes the hot-melt portion having wax power, and the hot-melt portion defines the outer peripheral surface of the core and is deformed by the heat treatment in the second deformation step. Accordingly, it is possible to easily deform at least a part of the core, and it is possible to efficiently manufacture a cylindrical recording medium.
- the core has a cylindrical or columnar core portion, and the heat melting portion includes the core. It is formed on the outer peripheral surface of the part.
- the heat-melting portion having wax power is formed on the outer peripheral surface of the cylindrical or columnar core portion, the amount of the heat-melting portion used can be reduced, which is efficient. .
- the core includes a shape memory portion made of a shape memory material exhibiting shape memory characteristics due to a temperature change.
- the outer peripheral surface is defined by the shape storage unit, and the second deformation step includes a step of deforming the shape storage unit based on the shape memory characteristics by the heat treatment.
- the core includes the shape memory portion exhibiting shape memory characteristics, and the shape memory portion defines the outer peripheral surface of the core and is deformed by the heat treatment in the second deformation step. Therefore, it is possible to easily deform at least a part of the core, and it is possible to efficiently manufacture a cylindrical recording medium.
- the shape memory section has an outer diameter smaller than the core, which is stored by the shape memory characteristic.
- the recording film has a small cylindrical or cylindrical basic shape
- the second deformation step is a step in which the expanded shape memory unit is subjected to the heat treatment based on the shape memory characteristics. Including restoring the shape.
- the shape memory section has a columnar or cylindrical basic shape having a smaller outer diameter than the core, and in the recording film forming step, the shape memory portion changes from this basic shape to a shape corresponding to the core.
- a recording film is formed on the outer peripheral surface of the core having the expanded shape memory unit.
- the expanded shape storage unit restores the basic shape in the second deformation step. Therefore, it is possible to manufacture a cylindrical recording medium more efficiently.
- the “shape corresponding to the core” described here is the shape of the core when the core is formed only of the shape storage unit, and a part of the core is formed by the shape storage unit. In this case, the shape is at least the same as the outer diameter of the core. That is, as a result of the “expansion to a shape corresponding to the core” described here, the core on which the recording film is to be formed is completed.
- the core has a tapered shape whose outer diameter changes in the longitudinal direction.
- the core removing step the core having the tapered shape is removed. You.
- the cylindrical recording medium can be easily manufactured in the core removing step so that the core can be easily removed. Becomes possible.
- the core has a plurality of grooves or protrusions on the outer peripheral surface
- the recording film in the recording film forming step, includes the plurality of grooves or It is formed on an outer peripheral surface having a projection.
- the outer peripheral surface of the core has a plurality of grooves or projections, it is possible to form a recording film corresponding to these grooves or projections. Therefore, it is possible to make the recording film widely correspond to the recording form of the cylindrical recording medium.
- the recording method includes the recording film forming step, the base material forming step, and the core removing step. Production of media is possible.
- FIG. 1 is a schematic sectional view of a cylindrical recording medium 100 according to a first embodiment of the present invention.
- FIG. 2 is a manufacturing process flow chart of the cylindrical recording medium 100 according to the first embodiment of the present invention.
- FIG. 3 is a manufacturing process diagram of the cylindrical recording medium 100 according to the first embodiment of the present invention.
- FIG. 4 is a cross-sectional view of the core 200 in a core forming step 10 in a manufacturing process of the cylindrical recording medium 100.
- FIG. 5 is a flowchart of a manufacturing process of a cylindrical recording medium 100 according to a second embodiment of the present invention.
- FIG. 6 is a manufacturing process diagram of the cylindrical recording medium 100 according to the second embodiment of the present invention.
- FIG. 7 is a cross-sectional view of a core 400 according to a modification of the heat treatment in the present invention.
- FIG. 8 is a schematic view of cores 500, 600, and 700 according to a modification of the core shape according to the present invention.
- FIG. 1 is a schematic cross-sectional view of the cylindrical recording medium 100.
- the cylindrical recording medium 100 is an example of the “cylindrical recording medium” according to the present invention, and is, for example, a magnetic recording medium similar to a hard disk or the like.
- the cylindrical recording medium 100 includes a recording layer 120 as an example of a “recording film” according to the present invention on the inner peripheral surface of a cylindrical substrate 110.
- the “cylindrical recording medium” according to the present invention is not limited to such a magnetic recording medium as long as it has a recording film on a cylindrical inner peripheral surface.
- Phase used The recording medium may be a change recording medium or a recording medium corresponding to another recording method.
- examples of the “recording film” according to the present invention include various recording layers such as a magnetic recording layer, a phase change recording layer, a magneto-optical recording layer, a dye layer, a dielectric layer, and a ferroelectric layer. You.
- various functional films such as a protective film, a nomination film, a transparent film, and a reflective film may be formed according to the recording method of the recording medium.
- these various functional films may be laminated between the substrate and the recording layer or may be formed on the outer peripheral surface of the substrate.
- the recording layer may be a multilayer film or may have a structure in which a plurality of recording layers are stacked.
- the base material 110 is an example of the "base material” according to the present invention, and is a cylindrical part that defines the external appearance of the cylindrical recording medium 100 and defines the mechanical strength and accuracy thereof.
- the material constituting the base material 110 does not impair the function of the cylindrical recording medium 100 as a recording medium, and the mechanical strength and accuracy of the cylindrical recording medium 100 can be ensured.
- the base material 110 is not limited to the single-layer structure shown in FIG. 1, and may have a multilayer structure.
- a layer referred to as a so-called “substrate” in a hard disk, which also has a force such as glass or aluminum, may be formed on the outer peripheral portion of the above-described metal film. That is, the base material 110 can take various forms according to the type and specification of the cylindrical recording medium 100.
- the recording layer 120 is a cylindrical layer formed on the inner peripheral surface of the base material 110 and made of, for example, a magnetic material.
- the base material 110 is formed on the outer peripheral surface of the recording layer 120.
- the inside of the recording layer 120 is a columnar cavity having an inner diameter R0. It should be noted that some kind of functional film may be formed between the base material 110 and the recording layer 120.
- the material forming the recording layer 120 is, for example, a metal thin film such as cobalt or a cobalt-chromium alloy thin film if it is a magnetic recording medium, and a germanium thin film if it is a phase change recording medium. It is an antimony tellurium alloy thin film.
- the material of the recording layer 120 is not limited to those illustrated here, and information can be freely recorded as long as information can be recorded based on physical and chemical properties of the material.
- a protective film for protecting the recording layer 120 is formed on the inner peripheral surface of the recording layer 120, for example, on the innermost peripheral surface. May be implemented.
- various functional films that have already been extended are not limited to the innermost peripheral surface of the recording layer 120, and may be laminated between the recording layer 120 and the base material 110, or may be the outermost peripheral surface of the base material 110. Formed on the surface.
- FIG. 2 is a flow chart of the manufacturing process of the cylindrical recording medium 100.
- core forming step 10 is a step of forming core 200.
- the recording film forming step 20 is a step of forming the recording layer 120 on the outer peripheral surface of the core 200.
- the base material forming step 30 is a step of forming the base material 110 on the recording layer 120.
- the core removing step 40 is a step of removing the core 200. When the core removing step 40 ends, the manufacturing step of the cylindrical recording medium 100 according to the present embodiment ends.
- FIG. 3 shows a manufacturing process of the cylindrical recording medium 100
- FIG. 4 shows a cross section of the core 200 in the core forming step 10 in the manufacturing process of the cylindrical recording medium 100.
- FIG. 3 is a cross-sectional view of the cylindrical recording medium 100 along the longitudinal direction.
- the core 200 also functions as an example of the “shape storage unit” according to the present invention.
- the shape memory resin is, for example, a polyurethane-based shape memory polymer.
- the "shape memory material" refers to a material capable of storing a physical shape and having at least plasticity and resilience in accordance with physical, electrical or chemical conditions. . Therefore, the shape memory material is not limited to the shape memory resin according to the present embodiment, but may be a shape memory metal such as a nickel titanium alloy or a copper aluminum alloy, or a shape memory ceramic.
- the core 200 is formed by injection molding or extrusion molding. Molded into a cylindrical shape with an outer diameter of Rl (RKRO).
- the cylindrical shape having the outer diameter R1 is an example of the “basic shape” according to the present invention, which is stored based on the shape memory characteristics of the shape memory resin as a component of the core 200.
- this shape will be referred to as “basic shape” as appropriate.
- a cylindrical (ie, basic) core 200 having an outer diameter R1 is expanded in the direction of the arrow in the drawing so as to have an outer diameter force SRO.
- SRO outer diameter force
- the shape memory resin constituting the core 200 has a large change in elastic modulus in a temperature range exceeding the glass transition point Tg (ie, an example of the above-mentioned "physical, electrical or chemical conditions"). Processing and deformation can be easily performed. Therefore, this expansion process is realized in such a temperature range by, for example, applying pressure in the outer peripheral direction.
- the process of expanding the core 200 is not limited to a particular one as long as the core 200 can be finally formed into a cylindrical shape with an outer diameter RO. It may be realized.
- the core 200 that has been subjected to the expansion process is cooled to a temperature equal to or lower than the glass transition point Tg while maintaining the expanded shape, that is, the shape of the core 200 to be manufactured.
- the core 200 is solidified while maintaining the cylindrical shape with the outer diameter RO, and the core 200 as shown in FIG. 3A is completed.
- the completed core 200 has the same shape as the “cylindrical cavity having an inner diameter RO” described above.
- the recording film forming step 20 is performed next (FIG. 3B).
- a material such as a magnetic material constituting the recording layer 120 is formed as a thin film on the outer peripheral surface of the core 200 by a sputtering method, a vacuum evaporation method, or the like.
- the recording layer 120 is formed by a vacuum deposition method or the like, the inside of the vacuum chamber is depressurized to a predetermined degree of vacuum, and while the core 200 is rotated in the vacuum chamber, the deposition of the magnetic material is performed. May go.
- the vapor deposition system is configured so that the central axis of rotation of the core 200 is perpendicular to the direction of the beam from the vapor deposition source, which is also the material force to be vapor deposited, the outer peripheral surface of the core 200 is Such a recording layer 120 can be easily formed.
- the recording film forming step 20 may have any form as long as the recording layer 120 of the cylindrical recording medium 100 can be formed on the outer peripheral surface of the core 200. ! / ,.
- a base material forming step 30 is performed (FIG. 3 (c)).
- the base material 110 is formed on the outer peripheral surface of the recording layer 120 by, for example, electric force or the like.
- the base 110 is formed by electric plating, for example, first, a thin film made of a constituent material (for example, chromium) of the base 110 is formed on the recording layer 120. Thereafter, the core 200 is connected to the force electrode and the deposited metal material is connected to the anode electrode, and plating is performed in the electrolytic cell.
- a constituent material for example, chromium
- the film thickness of the base material 110 formed in the base material forming step 30 is a force that can be freely determined within a range that does not impair the function of the cylindrical recording medium 100. For example, 0.5 mm or more When the film has a thickness, the mechanical strength and the roundness are sufficiently ensured, which is preferable.
- the substrate forming step 30 may be any method as long as the substrate 110 can be formed on the recording layer 120.
- a method such as electric structure and sputtering may be used.
- the base material 110 may have a multilayer structure. When having a multilayer structure, each layer may be formed by a different process.
- a core removing step 40 is performed (FIG. 3 (d)).
- the core 200 is subjected to a heat treatment, which is an example of the “heat treatment” according to the present invention.
- This heat treatment is, for example, a process of installing a heat source such as a band heater on the outer peripheral surface of the base material 110 and heating the core 200 using heat conduction. Further, this heat treatment is performed under the condition that the core 200 is exposed to a temperature exceeding the glass transition point Tg of the shape memory resin constituting the core 200. Under such conditions, the core 200 reverts to the aforementioned basic shape due to its shape memory properties.
- the core 200 restored to the basic shape has a cylindrical shape having an outer diameter R1 as described above, the core 200 has a cylindrical shape having an inner diameter R0 defined by the recording layer 120 and the base material 110. It can be easily removed from the cavity.
- the core removing step 40 is an example of the “core removing step” including the “core deforming step” including the “second deforming step” according to the present invention. Core 200 As a result, the cylindrical recording medium 100 according to the present embodiment as shown in FIG. 1 is completed.
- a cylindrical recording medium can be manufactured in advance in a cylindrical shape, and therefore, a cylindrical recording medium excellent in reliability and accuracy is provided. Can be manufactured.
- the outer diameter R 1 of the core 200 in the basic shape is freely determined as long as the core 200 can be easily removed in the core removing step 40.
- RO and R1 are not significantly different.
- a difference of about 1 mm between the two is preferable because the simplicity in the core forming step 10 and the core removing step 40 can both be ensured.
- the inner peripheral diameter of the basic shape or the shape after the expansion processing is free as long as the mechanical strength of the core 200 is not impaired, and depending on the type of shape memory material. It is also possible to have a very thin cylindrical shape.
- the shape of the inner periphery of the core 200 does not necessarily have to be circular.
- the inner peripheral portion may be molded in a polygonal shape. Such a case is, of course, in the category of a cylindrical shape, and in such a case, the core 200 is easily fixed in the manufacturing process, which is effective.
- the shape of the core 200 is not limited to the cylindrical shape as described above.
- it may have a cylindrical shape.
- the mechanical strength of the core is improved, so that the reliability of the manufactured cylindrical recording medium can be improved.
- the configuration of the core 200 is not limited to a single-layer structure as in the present embodiment.
- a cylindrical member made of, for example, a resin or a metal having no shape memory characteristics and having the same outer diameter as the inner diameter of the shape memory material is formed inside the core 200.
- the base material 110 force, for example, anolemmium, tungsten, titanium, nickel, or stainless steel Steel, etc. It is preferable if it is suitable.
- the temperature required to restore the core 200 to the basic shape is too high, some damage may be caused to the recording layer 120, while if it is too low, for example, Restoration may start during the sputtering process in the recording film forming step 20.
- the temperature to which the core 200 is exposed in the recording film forming step 20 and the base material forming step 30 is typically about 100 degrees Celsius or less, and therefore, restoration to the basic shape such as the glass transition point Tg starts. It is preferable that a shape memory material having a temperature within a temperature range of 100 to 120 degrees or a similar range is used as the material of the core 200.
- the core removing step 40 if the adhesion between the recording layer 120 and the core 200 increases for some reason, and the core 200 is restored to the basic shape and some physical obstacle occurs in the recording layer 120, If possible, for example, an isolation film or the like for facilitating separation from the core 200 may be formed on the recording layer 120 in advance. By forming the isolation film in this manner, it is possible to prevent the occurrence of a defect in the core removing step 40.
- the case where the core 200 and the recording layer 120 are not strictly in contact with each other is, of course, a category in which the recording film is formed “on the outer peripheral surface of the core” according to the present invention.
- FIG. 5 is a flowchart of the manufacturing process of the cylindrical recording medium 100
- FIG. 6 is a manufacturing process diagram of the cylindrical recording medium 100.
- FIG. 6 is a sectional view similar to FIG. In FIGS. 5 and 6, parts that are the same as in FIGS. 2 and 3 are given the same reference numerals, and descriptions thereof are omitted.
- the configuration of the cylindrical recording medium according to the second embodiment is the same as that of the cylindrical recording medium 100 according to the first embodiment, and only the manufacturing process is different. That is, the manufacturing process differs from the first embodiment in that the core 300 is used instead of the core 200 in the first embodiment.
- the manufacturing process of the cylindrical recording medium according to the present embodiment includes a core forming process 11, a recording film forming process 20, a base material forming process 30, and a core removing process 41. That is, The difference from the first embodiment is that a core forming step 11 is provided instead of the core forming step 10 and a core removing step 41 is provided instead of the core removing step 40.
- the core 300 is formed in the core forming step 11 (FIG. 6 (a)).
- the core 300 has a cylindrical heat melting portion 310 having an outer diameter R0 and an inner diameter R2 (R2 R0) as an example of the ⁇ heat melting portion '' according to the present invention, and a ⁇ core portion '' according to the present invention.
- An example is a cylindrical core 320 having an outer diameter R2.
- the heat melting part 310 is formed of wax.
- the wax includes petroleum-derived natural wax, synthetic wax such as polyethylene wax, processed wax or modified wax, etc., and is a solid at ordinary temperature, and becomes a liquid having a relatively low viscosity when heated to exceed its melting point. This is a concept that collectively refers to things.
- the core 320 is made of, for example, a resin material or a metal material.
- the core portion 320 is made of a resin, it is formed by, for example, the above-described injection molding.
- the core 300 has a core 320 and a heat-melted portion 310 formed by, for example, coating.
- the core 320 may have a certain degree of affinity for the heat-melted part 310 in order to improve the integrity of the core 300.
- the recording layer 120 is formed on the outer peripheral surface (FIG. 5 (b)), and subsequently, the base material 110 is formed (FIG. 5 (c)).
- the formation of the recording layer 120 and the base material 110 is the same as in the first embodiment described above.
- a core removing step 41 is performed.
- the core removing step 41 as in the first embodiment, the outer peripheral surface of the base 110 is covered with a band heater or the like, and the core is heated.
- the heat-melting part 310 if the temperature to which the heat-melting part 310 is exposed exceeds the melting point of the wax constituting the heat-melting part 310, the heat-melting part liquefies and is spontaneously or wiped off, or suctioned. For example, it is removed from the internal space of the cylindrical recording medium 100 (FIG. 5D).
- the wax constituting the hot-melt portion 310 has a melting point in the temperature range of 100 to 120 degrees or in the vicinity thereof.
- the present embodiment is different from the first embodiment in that a part of the core is melted and removed. Can be easily removed, and a cylindrical recording medium can be easily manufactured. Further, the completed cylindrical recording medium 100 has high reliability and accuracy as in the first embodiment.
- the core 300 according to the present embodiment may be entirely formed of wax. That is, the core 300 may be formed only of the heat melting portion 310. In such a case, the heat treatment in the core removing step 41 causes the entire core 300 to melt. In addition, the core 300 does not melt at all speeds at all portions, and does not melt at a high speed, and is easily melted from the outer peripheral portion due to heat conduction. Therefore, the core 300 is entirely configured as a heat melting portion. Alternatively, the core 300 can be removed before the core 300 is completely melted.
- the core 300 may have a free shape as long as the mechanical strength is maintained at a minimum.
- the mode of the "second deformation step" in the present invention is not limited to the above. As long as the entire core or at least a part of the core can be deformed by some heat treatment to facilitate the removal of the core, the core may have any mode. ⁇ Modified example>
- the heat treatment is realized by covering the outer peripheral surface of the base material 110 with a heat source such as a band heater.
- a heat source such as a band heater.
- FIG. 7 is a cross-sectional view showing a structure of a core 400 according to a modification of the present invention.
- the core 400 includes a cylindrical heat source 410 having an outer diameter R3 (R3 R0), a cylindrical heat conducting portion 420 having an inner diameter R3 and an outer diameter R4 (R3 ⁇ R4 ⁇ R0), and It is a cylindrical core having a cylindrical deformed portion 430 having an inner diameter R4 and an outer diameter R0.
- the heat source 410 is a heat source such as a coil heater, and supplies heat required to deform the deformable portion 430.
- the heat conduction part 420 is, for example, a metal material, and has, for example, excellent heat conduction characteristics. Aluminum, tungsten, titanium, nickel, stainless steel or the like is a suitable material.
- the deformed portion 430 is a material that can change the shape of the core 400 by heat treatment, such as the heat melting portion or the shape memory portion according to the above-described embodiment.
- core 400 it is possible to perform heat treatment without covering substrate 110 with a heat source, and to make heat source 410 function as a core of core 400. Are very efficient.
- the irregularities are formed in this way, it is effective because the deformed portion 430 is prevented from dropping during the manufacturing process of the cylindrical recording medium. Further, by providing a plurality of irregularities in this manner, the surface area of the heat conducting portion 420 can be increased, which is also effective in terms of heat conduction.
- the aspect of the “core deformation step” according to the present invention is not limited to the above-described heat treatment.
- the core may be dissolved by a chemical treatment such as etching.
- the core may be deformed by irradiating light of a specific wavelength.
- the core when the core is deformed by an etching process, various forms such as dry etching and wet etching can be employed. If the recording layer has good resistance to an etching solution or an etching atmosphere, the core is formed of a material having a good erosion property to the liquid or the atmosphere. It is possible to remove the core.
- the core may be removed by dissolving with the power solvent described in the case of the etching treatment.
- the core has good resistance to an organic solvent, so that deformation of the core due to the organic solvent can be prevented.
- water can be used as a solvent for removing the core, it is not necessary to use a large amount of an organic solvent or the like. U, also preferred from the point of environmental load.
- This embodiment is an example of the “first deformation step” according to the present invention.
- FIG. 8 is a schematic view of a core according to a modification of the present invention.
- the core according to the present invention may be a tapered core 500 in which the outer diameter gradually changes over its longitudinal direction, and is exemplified in FIG. 8 (b).
- the core 600 may have a plurality of protrusions or grooves (not shown) formed on the outer peripheral surface.
- the core 700 may have a plurality of protrusions formed along the longitudinal direction on the outer peripheral surface.
- the taper shape also improves the internal force of the cylindrical recording medium when the core 500 is removed.
- a recording medium having a recording layer having an uneven shape (group Z land structure, embossed pit structure, etc.) in which the plurality of grooves or protrusions are transplanted can be easily manufactured.
- the recording area of the recording layer can be easily divided by the projection, and the degree of freedom of the configuration of the recording medium can be improved.
- the present invention is not limited to the above-described embodiments, and may be modified as appropriate without departing from the spirit or spirit of the readable invention.
- the method for manufacturing a recording medium is also included in the technical scope of the present invention.
- the method for manufacturing a cylindrical recording medium according to the present invention includes, for example, a cylindrical recording medium in which recording films such as a magnetic recording layer, a phase change recording layer, a dye layer, and a dielectric layer are formed on the inner peripheral surface. It can be used for
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Citations (7)
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JPS55101166A (en) * | 1979-01-23 | 1980-08-01 | Shiro Okamura | Signal recording and reproducing device |
JPS5924440A (ja) * | 1982-08-02 | 1984-02-08 | Victor Co Of Japan Ltd | 磁気記録媒体 |
JPS61145746A (ja) * | 1984-12-20 | 1986-07-03 | Canon Inc | 光記録再生媒体 |
JPS6435724A (en) * | 1987-07-31 | 1989-02-06 | Denki Kagaku Kogyo Kk | Cylindrical magnetic recording medium |
JP2001067664A (ja) * | 1999-08-30 | 2001-03-16 | Hiroshi Yoshida | 円筒状情報記録媒体及び円筒状情報記録媒体の駆動装置 |
JP2002157731A (ja) * | 2000-11-21 | 2002-05-31 | Hitachi Ltd | 記録媒体及び磁気記憶装置 |
JP2003504780A (ja) * | 1999-07-12 | 2003-02-04 | テサ・アクチエンゲゼルシヤフト | 円筒形光データメモリ |
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2005
- 2005-03-02 JP JP2006510682A patent/JP4204010B2/ja not_active Expired - Fee Related
- 2005-03-02 WO PCT/JP2005/003472 patent/WO2005086149A1/ja active Application Filing
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JPS5924440A (ja) * | 1982-08-02 | 1984-02-08 | Victor Co Of Japan Ltd | 磁気記録媒体 |
JPS61145746A (ja) * | 1984-12-20 | 1986-07-03 | Canon Inc | 光記録再生媒体 |
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JP4204010B2 (ja) | 2009-01-07 |
JPWO2005086149A1 (ja) | 2008-01-24 |
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