25results about "Magnetic layer protection" patented technology

Provided is a method for manufacturing a magnetic recording medium, which efficiently removes foreign matter on the surface of the magnetic recording medium and improves the coating rate by using a lubricating layer. The method for manufacturing a magnetic recording medium in which a lubricating layer is formed on a laminate includes a step of applying a first lubricant and a second lubricant on the laminate, a step of polishing the surface of the laminate coated with the first lubricant and the second lubricant with a polishing material, and a step of removing the second lubricant from the laminate. The step of applying the second lubricant uses an immersion method or a spin coating method, the solvent of the second lubricant used in these methods makes the dissolved amount of the second lubricant higher than the dissolved amount of the first lubricant, and the polishing step includes a step of pressing and rubbing a tape containing a polishing material against the surface of the laminate. The step of removing the second lubricant includes irradiating the laminate coated with the first lubricant and the second lubricant with ultraviolet rays, or heating the laminate coated with the first lubricant and the second lubricant.

The present invention provides a method for manufacturing a magnetic recording medium that can efficiently remove foreign matter from the surface of the magnetic recording medium and has a high coverage rate by the lubricating layer. [Solution] The present invention relates to a method for manufacturing a magnetic recording medium, which involves forming a lubricating layer on a laminate obtained by laminating a magnetic recording layer and a protective layer on a substrate in that order, and comprises the steps of: applying a first lubricant and a second lubricant to the laminate; burning the surface of the laminate to which the first lubricant and the second lubricant have been applied with an abrasive; and removing the second lubricant from the laminate, wherein a spin coating method is used for applying the second lubricant, the burning step includes pressing a tape containing an abrasive onto the surface of the laminate and rubbing it, and the step of removing the second lubricant includes at least one of the steps of irradiating the laminate to which the first lubricant and the second lubricant have been applied with ultraviolet light and heat treating the laminate to which the first lubricant and the second lubricant have been applied.

A method of manufacturing a magnetic recording medium includes burnishing, with an abrasive material, a surface of a stack including a magnetic recording layer and a protective layer stacked on a substrate in order of the magnetic recording layer and the protective layer. The burnishing of the surface of the stack includes using a long abrasive tape including abrasive grains as the abrasive material fixed onto a support in a state of being wound in roll form, and pressing the abrasive tape, supplied from the state of being wound in the roll form, against the surface of the stack so as to rub the surface of the stack. The abrasive tape in the state of being wound in the roll form is subjected to vacuum treatment in advance such that loose abrasive grains are reduced.

The purpose of the present invention is to provide a method for manufacturing a magnetic recording medium, wherein foreign matter on the surface of the magnetic recording medium can be efficiently removed, and the coating rate by a lubricating layer is high. A method for manufacturing a magnetic recording medium according to the present invention is a method for manufacturing a magnetic recording medium in which a lubricating layer is formed on a laminate in which a magnetic recording layer and a protective layer are laminated in this order on a substrate, the method comprising: a step for applying a first lubricant and a second lubricant on the laminate, and a polishing step for polishing the surface of the laminate to which the first lubricant and the second lubricant have been applied with a polishing material, and a step for removing the second lubricant from the laminate, the polishing step including: a step for pressing and rubbing a tape containing the polishing material against the surface of the laminate; the step of removing the second lubricant includes a step of irradiating the laminate coated with the first lubricant and the second lubricant with light emitted from an LED light source.

The present invention addresses the problem of providing a method for manufacturing a magnetic recording medium capable of improving the productivity of a magnetic recording medium. A method for manufacturing a magnetic recording medium according to the present invention comprises a polishing step for polishing the surface of a laminate in which a magnetic recording layer and a protective layer are laminated in this order on a substrate with a polishing material, the polishing step includes a step of using a long abrasive tape in a state in which abrasive grains, which are the abrasive material, are adhered to a support body, and pressing and rubbing the abrasive tape, which is supplied from the state in which the abrasive tape is wound in the state in which the abrasive tape is wound in the state in which the abrasive tape is wound in the state in which the abrasive tape is wound in the state in which the abrasive tape is wound in the state in which the abrasive tape is wound, against the surface of the laminate. The grinding belt in which abrasive grains that are dissociated by the vacuum treatment have been reduced in advance is used as the grinding belt that is wound in the roll shape.

High temperature lubricants for magnetic media include a plurality of segments according to general formula (I):where Rd is any linker chemistry and each Re may be a reactive end-group and anchoring group containing at least one constituent configured for at least one of tribochemical, thermochemical, or optochemical bonding. The at least one constituent can be cyclopropane or cyclobutane.

A method for manufacturing a magnetic recording medium includes burnishing a surface of a laminated structure using an abrasive material, the laminated structure including a magnetic recording layer and a protective layer successively laminated on a substrate. The burnishing includes using a long abrasive tape including abrasive grains as the abrasive material fixed on a support in a state wound in a roll shape, and pressing the abrasive tape supplied from the state wound in the roll shape against the surface of the laminated structure, thereby abrading the surface of the laminated structure. The abrasive tape in the state wound in the roll shape is re-rolled in advance to remove loose abrasive grains therefrom.

The invention provides a magnetic recording medium production apparatus, a magnetic recording medium production method, and a finishing device, which can detect or predict the generation of defective products at an early stage during the production of a magnetic recording medium so as to improve the productivity of the magnetic recording medium. The apparatus for producing a magnetic recording medium includes: a film forming device that sequentially forms at least a magnetic recording layer and a protective layer on a substrate; a lubricant coating device for coating a lubricant on the protective layer formed by the film forming device to form a lubricating layer; and a finishing device for finishing the surface of the lubricating layer coated by the lubricant coating device by using an abrasive material, the magnetic recording medium production apparatus comprising: a collection unit for collecting data of a load amount during finishing; a storage unit that stores data of the collected load amount; a calculation unit that performs calculation using the stored load amount data; and a setting unit that sets manufacturing conditions for the film forming device or the lubricant coating device on the basis of the calculation results of the calculation unit.

The present invention provides a magnetic recording medium production apparatus, a magnetic recording medium production method, and a burnishing apparatus that enable early detection or prediction of defective products during the production of magnetic recording media, thereby improving the productivity of magnetic recording media. [Solution] A production apparatus for a magnetic recording medium 1, comprising: a film deposition apparatus that deposits at least a magnetic recording layer 112 and a protective layer 113 on a substrate 111 in that order; a lubricant application apparatus that applies a lubricant onto the protective layer 113 deposited by the film deposition apparatus to form a lubricating layer 12; and a burnishing apparatus that burns the surface of the lubricating layer 12 applied by the lubricating apparatus with an abrasive, further comprising: a collection unit that collects load amount data during burnishing; a storage unit that stores the collected load amount data; a calculation unit that performs calculations using the stored load amount data; and a setting unit that sets the manufacturing conditions of the film deposition apparatus or the lubricating apparatus based on the calculation results from the calculation unit.

To provide a disk device capable of suppressing oxygen consumption inside the device and improving reliability.SOLUTION: According to one embodiment, a disk device comprises a housing in which a low-density gas containing oxygen and having a density lower than that of air is sealed, a disk-shaped recording medium rotatably provided in the housing, a spindle motor provided in the housing and supporting and rotating the recording medium, and a magnetic head including a thermal assist element for heating the recording medium. The surface of the magnet of the spindle motor is covered with a shielding film for shielding oxygen permeation.SELECTED DRAWING: Figure 3

A magnetic recording medium production apparatus includes a film deposition device that forms a magnetic recording layer and a protective layer on a substrate, in the stated order; a lubricant application device configured to form a lubrication layer by applying a lubricant on the protective layer formed by the film deposition device; a varnishing device configured to perform a varnishing process, with a polishing material, on a surface of the lubrication layer applied by the lubricant application device; a processor; and a memory that includes instructions, which when executed, cause the processor to execute collecting data on a load amount during the varnishing process; storing the collected data on the load amount; performing an operation by using the stored data on the load amount; and setting a manufacturing condition of the film deposition device or the lubricant application device based on an operation result obtained by performing the operation.

A high temperature lubricant for magnetic media includes a plurality of segments according to the general formula (I): Rc-Rd-Rc (I) wherein Rd is any of the linker chemical structures, and each Rc can be a reactive end group and an anchor group comprising at least one component configured to effect at least one of frictional chemical bonding, thermal chemical bonding, or photo-chemical bonding. The at least one component can be cyclopropane or cyclobutane.

The method for manufacturing the magnetic recording medium can efficiently remove foreign matters on the surface of the magnetic recording medium, and the coating rate of a lubricating layer is high. A method for manufacturing a magnetic recording medium in which a lubricating layer is formed on a laminate in which a magnetic recording layer and a protective layer are sequentially laminated on a substrate, the method comprising: a step for applying a first lubricant and a second lubricant on the laminate, the present invention relates to a method for polishing a laminate comprising a first lubricant and a second lubricant, a step for polishing the surface of the laminate coated with the first lubricant and the second lubricant with a polishing material, and a step for removing the second lubricant from the laminate, the second lubricant being applied by a spin coating method, the polishing step comprising: a step for pressing and rubbing a tape containing the polishing material against the surface of the laminate; the step for removing the second lubricant includes at least one of a step for irradiating the laminate coated with the first lubricant and the second lubricant with ultraviolet light and a step for heating the laminate coated with the first lubricant and the second lubricant.

To provide a manufacturing method of a magnetic recording medium capable of enhancing productivity of the magnetic recording medium.SOLUTION: A method for manufacturing a magnetic recording medium according to the present invention includes a burnishing step of burnishing, with an abrasive, a surface of a laminate in which a magnetic recording layer and a protective layer are laminated in this order on a substrate, the burnishing step includes a step of using a long polishing tape in which abrasive grains are fixed as the polishing material on a support in a state of being wound in a roll shape, and pressing the polishing tape supplied from the state of being wound in a roll shape against the surface of the laminate to rub the surface, in which the polishing tape in which free abrasive grains are reduced by performing a vacuum treatment in advance is used as the polishing tape in the state of being wound in a roll shape.SELECTED DRAWING: Figure 2

High temperature lubricants for magnetic recording media are provided. One such lubricant has a plurality of segments according to general formula (I); Re-Rn-Rm-Rv-Rd-Rv-Rc-Rm-Rn-Re (I) where Rn when present is a C1-C4 repeating unit having a dipole moment greater than 0.036 D, Rm when present is a C1-C4 repeating unit having a dipole moment greater than 0.036 D and enthalpy of vaporization between 17 kl / mol and 40.7 kl / mol but different than Rn, and at least one of Rn or Rn is present, Re is a first anchoring functional group, Rv is optionally a second anchoring functional group and Rd is a linker.

The embodiment of the invention relates to a disk device. According to one embodiment, the disk device includes: a housing in which a low-density gas containing oxygen and having a lower density than air is sealed; a disc-shaped recording medium provided in the case so as to be rotatable; a spindle motor which is provided in the housing, supports the recording medium, and rotates the recording medium; and a magnetic head including a thermal assist element that heats the recording medium. The surface of the magnet of the spindle motor is covered by a shielding film which blocks the transmission of oxygen.

The objective is to provide a method for manufacturing a magnetic recording medium that can efficiently remove foreign matter from the surface of the magnetic recording medium and has a high coverage rate by the lubricating layer. [Solution] The present invention relates to a method for manufacturing a magnetic recording medium, comprising forming a lubricating layer on a laminate in which a magnetic recording layer and a protective layer are laminated on a substrate in that order, the method comprising the steps of: applying a first lubricant and a second lubricant to the laminate; burning the surface of the laminate to which the first lubricant and the second lubricant are applied with an abrasive; and removing the second lubricant from the laminate, wherein the burning step includes pressing a tape containing the abrasive onto the surface of the laminate and rubbing it, and the step of removing the second lubricant includes irradiating the laminate to which the first lubricant and the second lubricant are applied with light emitted from an LED light source.

According to one embodiment, a disk device includes a housing filled with a low density gas containing oxygen and having a density lower than a density of air, a disk-shaped recording medium provided in the housing to be rotatable, a spindle motor provided in the housing and supporting and rotating the recording medium, and a magnetic head including a heat assist element which heats the recording medium. A surface of magnet of the spindle motor is covered with a shielding film blocking oxygen permeation.

The present invention provides a method for manufacturing a magnetic recording medium that efficiently removes foreign matter from the surface and improves the coverage rate by the lubricating layer. [Solution] A method for manufacturing a magnetic recording medium 1 in which a lubricating layer 12 is formed on a laminate 11 obtained by stacking a magnetic recording layer 112 and a protective layer 113 on a substrate 111 in this order includes the steps of applying a first and a second lubricant, burning the surface of the laminate to which the first and second lubricants have been applied with an abrasive, and removing the second lubricant from the laminate, wherein the step of applying the second lubricant is to use a dip method or a spin coating method, the solvent for the second lubricant is to have a higher dissolution rate for the second lubricant than for the dissolution rate for the first lubricant, the burning step includes pressing a tape containing an abrasive onto the surface of the laminate and rubbing it, and the step of removing the second lubricant includes irradiating the laminate to which the first and second lubricants have been applied with ultraviolet light or heat treating the laminate to which the first and second lubricants have been applied.

High temperature lubricants for magnetic recording media are provided. One such lubricant has a plurality of segments according to general formula (I):where Rn when present is a C1-C4 repeating unit having a dipole moment greater than 0.036 D, Rm when present is a C1-C4 repeating unit having a dipole moment greater than 0.036 D and enthalpy of vaporization between 17 kJ / mol and 40.7 kJ / mol but different than Rn, and at least one of Rn or Rn is present, Re is a first anchoring functional group, Rv is optionally a second anchoring functional group and Rd is a linker.

A magnetic recording medium production method which includes forming a lubricating layer over a stack including a substrate, a magnetic recording layer over the substrate, and a protective layer over the magnetic recording layer includes applying a first lubricant and a second lubricant to the stack; burnishing, with an abrasive, a surface of the stack to which the first lubricant and the second lubricant are applied; and removing the second lubricant over the stack. The application of the second lubricant is performed through spin coating. The burnishing includes abrading the surface of the stack by pressing a tape containing the abrasive against the surface of the stack. The removal of the second lubricant includes at least one of irradiating the stack, to which the first lubricant and the second lubricant are applied, with ultraviolet radiation, or heating the stack to which the first lubricant and the second lubricant are applied.

A magnetic recording medium production method, which includes forming a lubricating layer over a stack including a substrate, a magnetic recording layer over the substrate, and a protective layer over the magnetic recording layer, includes applying a first lubricant and a second lubricant to the stack; burnishing, with an abrasive, a surface of the stack to which the first lubricant and the second lubricant are applied; and removing the second lubricant over the stack. The burnishing includes abrading the surface of the stack by pressing a tape containing the abrasive against the surface of the stack. The removal of the second lubricant includes irradiating the stack, to which the first lubricant and the second lubricant are applied, with light emitted from an LED light source.

A magnetic recording medium production method which includes forming a lubricating layer over a stack including a substrate, a magnetic recording layer over the substrate, and a protective layer over the magnetic recording layer includes applying a first lubricant and a second lubricant to the stack; burnishing a surface of the stack with an abrasive; and removing the second lubricant over the stack. The application of the second lubricant is performed through dipping or spin coating. A dissolution amount of the second lubricant in a solvent for the second lubricant used in the dipping or the spin coating is more than a dissolution amount of the first lubricant in the solvent. The burnishing includes abrading the surface of the stack by pressing a tape containing the abrasive against the surface of the stack. The removal of the second lubricant includes irradiating the stack with ultraviolet radiation, or heating the stack.

There is provided a fluorine-containing ether compound represented by the following formula:wherein R3 and R4 are the same or different perfluoropolyether chains; R2 and R5 are each independently a divalent linking group having one or more polar groups; R1 and R6 are each independently an end group containing a tertiary amine, and represented by —X—NR7R8 (X is a divalent hydrocarbon group having 1 to 5 carbon atoms; R7 and R8 are the same or different saturated aliphatic groups; and R7 and R8 may form a ring structure together with a nitrogen atom).

To provide a method for manufacturing a magnetic recording medium that is capable of improving the productivity of the magnetic recording medium.SOLUTION: A method for manufacturing a magnetic recording medium according to the present invention includes a burnish process of burnishing, with an abrasive material, a surface of a laminate body obtained by laying a magnetic recording layer and a protection layer on a substrate in order just mentioned, and the burnish process includes a process of using a long abrasive tape, which has abrasive grains fixed onto a support as the abrasive material, wound into a roll and pressing the abrasive tape, which is supplied from the rolled state, against the surface of the laminate body and performing abrading, in which the abrasive tape in the rolled state is an abrasive tape from which loose abrasive grains have been removed by rewinding.SELECTED DRAWING: Figure 2