Abstract: A magnetic transfer apparatus for transferring patterned information formed on a surface of a master disk to a magnetic recording medium as a slave disk placed in intimate contact with the surface of the master disk by applying a magnetic field to the disks, which comprises: a magnet; a first holder for holding the master disk and the slave disk; and a second holder facing the first holder, the first holder being supported by a supporting member, the magnet being disposed on only an outer side of the second holder, and the second holder being formed solely of a lid.

Abstract: In a magnetic transfer master carrier, as a substrate, one having a Young's modulus E (GPa) in the range of 85 to 250 is used. Magnetic transfer is performed under conditions in which 2≦&agr;Ed3/{P(S2/S1)}≦400 (where the constant &agr;=7.37×109) is satisfied, where d (m) is the thickness of the substrate from the bottom face of a recessed portion to the back face, S1 (m2) is the total area of the cross sections of the projected portions which are parallel to the plane of the substrate at a height of 50% of Dmax from the bottom face of the recessed portion when the height from the bottom face of the recessed portion to the top face of a projected portion is denoted by Dmax, S2 (m2) is the total area of the bottom faces of the recessed portions and the cross sections of the projected portions at the positions of the relevant bottom faces, and P (MPa) is the tight contact pressure between the master carrier and the slave medium at the time of magnetic transfer.

Abstract: Pattern damage caused by defects and the like of a magnetic layer provided on a substrate of a master carrier for magnetic transfer is prevented and durability of the master carrier is improved. The master carrier for magnetic transfer includes a lamination structure, on a substrate, in which not less than one of two-layer structures laminated in a lamination direction, each of the two-layer structures including a magnetic layer and a hard layer having higher hardness than the magnetic layer, which are laminated on each other in an order of the hard layer and the magnetic layer from the substrate side. The master carrier further includes a hard layer which has higher hardness than the magnetic layer on a top surface of the lamination structure.

Abstract: The invention provides a method for performing magnetic transfer by bringing a master carrier for magnetic transfer and a slave medium in close contact with each other and by applying a magnetic field for transfer, whereby a product (Ms1&dgr;1) of saturation magnetization (Ms1) and film thickness (&dgr;1) of a magnetic layer of the master carrier to be used for magnetic transfer on a surface of the slave medium with earlier magnetic transfer and a product (Ms2&dgr;2) of saturation magnetization (Ms2) and film thickness (&dgr;2) of a magnetic layer of the master carrier are in a relation of: 1.5<(MS2&dgr;2)/(Ms1&dgr;1)<10, and a transfer magnetic field (Hdu1) applied to the surface with the earlier magnetic transfer and a transfer magnetic field (Hdu2) on the surface of the slave medium with the subsequent magnetic transfer are in a relation of: 0.2≦Hdu2/Hdu1≦0.9.

Abstract: A small and thin pressing direction sensor that can continually detect pressing directions in the angle range of 360 degrees is provided. This pressing direction sensor includes a ring-like resistive film pattern, a first electrode pattern, and a conductive member that electrically connects the resistive film pattern and the first electrode pattern when pressed. The voltage of the first electrode pattern represents the pressing direction. This pressing direction sensor may further include a second electrode pattern. A signal representing the pressing force can be obtained from the second electrode pattern when the pressed conductive member is brought into contact with the second electrode pattern.

Abstract: A master information carrier for magnetic transfer to an in-plane magnetic recording medium includes a base sheet having an irregularity pattern representing information to be transferred to an in-plane magnetic recording medium and a magnetic layer formed along the irregularity pattern. The thickness da1 of the magnetic layer on the upper surface of a protruding portion of the irregularity pattern and the thickness da2 of the magnetic layer on each of the side surfaces of the protruding portion satisfy the following condition, 0.05<da2/da1≦1.3.

Abstract: A preconditioning process for contact printing of a reference servo pattern on storage media. The preconditioning process presets the magnetization of problematic grains, that is, grains that typically contribute to spurious subpulses on the media, in the direction of the printing field.

Abstract: A magnetic transfer apparatus includes an inexpensive and small adjusting mechanism for adjusting the positions of the magnetic heads, that facilitates preventing anomaly of drastically changing transferred signal intensity, and a very rigid mounting mechanism for mounting the magnetic heads. The magnetic transfer apparatus includes a magnetic field application means for magnetic transfer, the magnetic field application means applying a magnetic field to the master disc and the perpendicular magnetic recording medium positioned in tight contact with each other or in close proximity to each other, the magnetic field application means including a pair of magnetic heads for magnetic transfer positioned symmetrically with respect to the surface of the perpendicular magnetic recording medium facing to the master disc, the magnetic heads moving always keeping their symmetrical positional relation ship with respect to the surface of the perpendicular magnetic recording medium facing to the master disc.

Abstract: A magnetic recording process includes applying an initial magnetic field to magnetize a magnetic recording medium and positioning a ferromagnetic mask over the magnetic recording medium. The ferromagnetic mask has a tooth which shields a portion of the magnetic recording medium in order to maintain the initial magnetic field in the portion. The process also includes applying a biasing magnetic field to the magnetic recording medium and applying a recording magnetic field to the magnetic recording medium while applying the biasing magnetic field. The biasing magnetic field is substantially perpendicular to the initial magnetic field and the recording magnetic field is substantially opposite in polarity to the initial magnetic field.

Abstract: The present invention provides a magnetic transfer method for transferring information by bringing a master carrier for magnetic transfer and a slave medium into close contact with each other and by applying a magnetic field for magnetic transfer, said master carrier of magnetic transfer comprising servo areas to be transferred from the master carrier to the slave medium and data areas not to be transferred, both on the same plane.

Abstract: A magnetic transfer apparatus capable of enhancing the quality of a transfer signal by improving close contact property between master and slave media in magnetic transfer carried out to magnetically transfer an information signal such as a servo signal from the master medium to the slave medium. In the magnetic transfer specifically carried out by applying a transfer magnetic field in a close contact state of the master medium bearing information and the slave medium, the master and slave media are closely contacted with each other in a state where the backside of the master medium is adsorbed and held on the flat adsorbing surface of an adsorbing member to heighten the flatness of the master medium. In the case of one-surface transfer, preferably, an elastic body is closely contacted with the surface opposite to the master medium on the slave medium.

Abstract: A contact magnetic transfer method for forming a pattern of magnetized servo regions in the magnetic recording layer of a rigid magnetic recording disk uses a flexible master disk and a differential gas pressure to press the patterns of the master disk against the slave disk. The master disk is a flexible plastic film with islands of magnetic shielding material extending above the film surface, the islands forming a pattern representative of the servo pattern to be formed in the recording layer of the disk. The plastic film is sealed at the outer periphery of the opening of a pressure chamber with the islands located outside the chamber. The previously DC-magnetized slave disk is brought into gentle contact with the islands and gas pressure inside the chamber is increased to slightly above atmospheric.

Abstract: In the performance of a magnetic transfer utilizing a magnetic transfer master medium, the occurrence of signal omissions in the magnetic data transferred to the slave medium is prevented. By forming the protrusion portions of the uneven pattern formed on the surface of the master medium so that the width thereof in the direction of the track pitch is narrower than said track width, no depression portions that are surrounded on all four sides by protrusion portions are formed.

Abstract: A favorable magnetic transfer is performed to a perpendicular magnetic recording medium. A master medium is provided with a substrate on the surface of which protrusion portions, which form a pattern corresponding to the data that is to be transferred, having a pliable layer thereon have been formed. The master medium is further provided with a soft magnetic layer formed in the depression portions between the protrusion portions, and which is magnetically linked to the soft magnetic layer of the protrusion portions. The soft magnetic layer of the surface of the protrusion portions is conjoined with the magnetic recording layer of a perpendicular magnetic recording medium to form a conjoined body, and a transfer magnetic field is applied to the conjoined body in the direction from the substrate of the master medium toward the slave medium to perform the magnetic transfer.

Abstract: A contact magnetic transfer method forms a pattern of magnetized servo regions in the magnetic recording layer of a rigid perpendicular magnetic recording disk. A master disk or template has a rigid or flexible base with a first film of soft magnetic material on the base and a pattern of islands of soft magnetic material on and extending above the first film and recesses between the islands. The slave disk to be servo patterned is either DC magnetized in a first direction perpendicular to the plane of the recording layer or AC-erased. The slave disk is then placed with its outer layer in proximity to the islands of the master template and a magnetic field is applied in a perpendicular direction to magnetize the regions beneath the islands in the same direction as the applied field. In the regions of the recording layer beneath the recesses of the template the magnetization is reversed from that in the regions beneath the islands.

Abstract: The present invention provides a magnetic transfer method for transferring information by bringing a master carrier for magnetic transfer and a slave medium into close contact with each other and by applying a magnetic field for transfer, said master carrier comprising servo areas and data areas, said servo areas are convex, and difference of height between the data areas and the servo areas is within the range of 50-800 nm.

Abstract: A magnetic transcription device for transcribing information signals of a master information carrier in a magnetic recording medium by applying a magnetic field generated by magnetic field generating means to a contact body obtained by contacting the master information carrier having a base on which ferromagnetic bodies corresponding to the information signals are formed with a magnetic recording medium having a ferromagnetic layer, wherein the magnetic recording medium includes driving means for adjusting a distance between the magnetic field generating means and the contact body while rotating the magnetic field generating means relative to the contact body.

Abstract: A magnetic pattern of a master disc is transferred to both sides of a magnetic recording medium with no displacement. The origin of a magnetic recording medium can be determined by observing the inner or outer periphery of the magnetic recording medium. Back-side alignment marks are formed on the front side of the magnetic recording medium based on the origin thus determined. The back-side alignment marks can be observed with a microscope and front-side alignment marks for the magnetic recording medium can be provided on the back side of the magnetic recording medium. The alignment marks provided on the front/back sides of the magnetic recording medium are aligned with the corresponding alignment marks provided on the master disc, and a magnetic pattern formed on the soft magnetic material of the master disc is can be transferred to the magnetic recording medium.

Abstract: A high-level region and a low-level region are formed on a surface of a nonmagnetic base member, in which high-level region is formed a ferromagnetic thin film pattern which corresponds to a preformat information signal, in such a structure that a flow promoting shape of such a shape (e.g., smooth curved shape, polygonal shape) that inhibits the stagnation of a flow of a detergent to promote the flow in order to prevents sticking and residing of foreign matter contained in the detergent is formed at an area where the detergent is liable to stagnate in the high-level region, i.e. at an inner radial portion of a disk-shaped mater information carrier.

Abstract: A master information carrier includes a substrate having a pattern of protrusions and recesses corresponding to information to be transferred to a slave medium and a magnetic layer formed on the pattern of protrusions and recesses of the substrate. Further, an entire area of the magnetic layer on the pattern of protrusions and recesses is coated with a protective coating and a surface free energy of the protective coating is in a range of 57 mN/m-69 mN/m. A DLC coating is preferable as the protective coating.

Abstract: In magnetic transfer performed to transfer an information signal such as a servo signal from a master medium to a slave medium, the degradation of transfer quality caused by a failure of close contact between the master medium and the slave medium due to dust accumulated thereon is prevented. Magnetic transfer means is provided to carry out the magnetic transfer by bringing the master medium bearing information and the slave medium into close contact with each other, and applying a transfer magnetic field. Replacing means is provided to prepare a plurality of master media, and replacing the master medium after magnetic transfer is performed a predetermined number of times. Cleaning means is also provided to clean the replaced master medium by ultrasonic washing or the like.

Abstract: A master information carrier is made to overlap with a magnetic recording medium being a magnetic recording medium in an adhering state, and a pattern corresponding to information signals on the master information carrier is transferred to the magnetic recording medium, thereby magnetically transferring a magnetized pattern of information signals to the magnetic recording medium. Thereafter, an urging force to the magnetic recording medium side is applied to the master information carrier, and in the urging force applied state, a gas under pressure is supplied on the adhering/joining surfaces of the master information carrier and the magnetic recording medium, thereby releasing the adhering state of the master information carrier and the magnetic recording medium. Then, the application of the urging force is released to continue the supply of the gas under pressure, thereby pulling away the master information carrier from the magnetic recording medium and moving them.

Abstract: A master medium for use in magnetic transfer of information includes a metal disk which has a first relief or recess pattern representing the information. The metal disk is produced by exposing a photoresist film formed on a base disk with a laser or electron beam modulated with the information while rotating the base disk; developing the photoresist film so as to form an original disk having a second relief or recess pattern; depositing metal on the original disk so as to mold the metal disk on the original disk; and removing the metal disk from the original disk.

Abstract: A magnetic transfer method includes a first step (ST103) of preparing a magnetic disk, a second step (ST105) of forming a layer of lubricant on the magnetic disk, a third step (ST108) of bringing a surface of the magnetic layer on the magnetic disk into close contact with a magnetic transfer master having a magnetic film formed on at least one side and magnetically transferring a pattern of the magnetic film on the magnetic transfer master onto the surface of the magnetic disk through application of an external magnetic field, and a fourth step (ST104, ST106) of burnishing at least a surface of the magnetic disk that comes into contact with the magnetic transfer master. The first step, the fourth step, the second step, the fourth step, and the third step are performed in the stated order.

Abstract: A method of controlling magnetic recording in a magnetic recording medium and a control device for the same provides a symmetrical transferred signal waveform of equal magnitude with good reproducibility and performs magnetic transfer with high reliability. In performing initial magnetization prior to performing transfer magnetization, an AC magnetic field, the polarity of which changes in the perpendicular direction Y (or both in the perpendicular direction Y and parallel direction X), is applied to the recording surface of the magnetic recording layer of a magnetic recording medium, and the intensity of the AC magnetic field is gradually decreased with time, to demagnetize the entire magnetic recording layer.

Abstract: Recording of preformat information is accomplished by magnetic transfer to a perpendicular magnetic recording medium with a higher density. The method includes: (1) an initialization step, in which a magnetic field is applied to the magnetic recording medium in the direction perpendicular to the medium surface and direction of magnetization of the whole surface of the magnetic recording medium is aligned to one direction perpendicular to the medium surface, and (2) a magnetic transfer step, in which a magnetic field in the longitudinal direction is applied to both a master disk carrying preformat information and the magnetic recording medium with the master disk in close contact with or in proximity to one or both surfaces of the magnetic recording medium.

Abstract: A magnetic transfer apparatus magnetically transfers information carried by a master information carrier to a slave medium held in close contact with the master information carrier by a holder disposed on the holder support portion of a magnetic transfer apparatus. The holder is formed by a pair of halves movable toward and away from each other, and a transfer magnetic field is applied to the master information carrier and the slave medium held in close contact with each other by the holder. A locator mechanism is provided between the holder support portion and the holder and locates the holder at least in a direction perpendicular to the central axis of the holder.

Abstract: A method for forming a magnetic pattern by applying a first external magnetic field to a magnetic recording medium having a magnetic layer to magnetize uniformly the magnetic layer in a predetermined direction and heating locally the magnetic layer while a second external magnetic field is applied thereto, whereby the heated portion is magnetized in the direction opposite to the predetermined direction, wherein the second external magnetic field has a pulse-like magnetic field component. The method can form a fine magnetic pattern efficiently in a medium for high density recording, and a magnetic recording medium and a magnetic recording device capable of recording with high density can be provided economically in a short time.

Abstract: A magnetic transfer method includes a first step (ST103) of preparing a magnetic disk, a second step (ST105) of forming a layer of lubricant on the magnetic disk, a third step (ST108) of bringing a surface of the magnetic layer on the magnetic disk into close contact with a magnetic transfer master having a magnetic film formed on at least one side and magnetically transferring a pattern of the magnetic film on the magnetic transfer master onto the surface of the magnetic disk through application of an external magnetic field, and a fourth step (ST104, ST106) of burnishing at least a surface of the magnetic disk that comes into contact with the magnetic transfer master. The first step, the fourth step, the second step, the fourth step, and the third step are performed in the stated order.

Abstract: Masters for servo printing, systems containing such masters and methods of using such masters are disclosed.

Abstract: A method and system for self-servo writing a disk drive by transferring a servo reference pattern by magnetic printing onto at least one storage surface of a reference disk, wherein a resulting printed reference pattern includes embedded servo information providing servo timing and transducer head position information; assembling the disk drive including the steps of installing at least said disk into the disk drive and enclosing said disk and the data transducers within a housing sealed against particulate contamination from an eternal ambient environment; reading the printed reference pattern from said disk via at least one transducer head to generate a readback signal; sampling the readback signal at a sampling rate to generate a sampled signal; processing the sampled signal waveform specturm to generate a recovered signal including the embedded servo information and a fundamental frequency of the sampled signal; using the servo information from the recovered signal to precisely position and maintain the d

Abstract: Disclosed is a magnetic transfer method magnetically transferring information signals such as servo signals from a master medium to a slave medium, which is capable of preventing the occurrence of missing signals due to insufficient contact of the master medium and the slave medium originating from adhering of dust to the slave medium, thus increasing reliability. When the master medium bearing information signals and the slave medium are brought into close contacted with each other, and when a transfer magnetic field is applied to the master medium and the slave medium to magnetically transfer the information signal from the master medium to the slave medium, a metal thin film formed on a substrate of the master medium is electrically grounded, and charges of the master medium are removed, thus reducing a quantity of adhering dust.

Abstract: The present invention provides a method for magnetic transfer, the method including the steps of arranging ring shape head electromagnets at least on one of upper and lower surfaces of the slave medium, rotating the slave medium or the ring shape head electromagnet in track direction, performing initial DC magnetization on the slave medium in advance in track direction by applying magnetic field in track direction on the surface of the slave medium, bringing the master carrier for magnetic transfer closely together with the slave medium processed by the initial DC magnetization, and performing magnetic transfer by applying magnetic field for transfer in track direction reverse to the direction of the initial DC magnetization on the surface of the slave medium.

Abstract: In the case where a magnetic transfer process is used to record a specific magnetic pattern during the magnetic disk manufacturing process, a read/write tester for conducting a glide height test and a read/write test and a particle testing means are provided at the front section of a magnetic transfer device. The tester records a specific magnetic pattern onto a magnetic disk in a magnetic transfer method. An optical testing device, a read/write tester for conducting a glide height test, and a read/write test in sampling are provided at the rear section of the device. This enables the detection of consecutive disk abnormalities caused by particles, which are adhered a master disk or put between the magnetic disk and the master disk. A transfer quality control device collects the results of the respective tests, so that the quality can be controlled using the results. Accordingly, the present invention assures the desired quality of a magnetic disk produced after transfer.

Abstract: A master information carrier has a shape pattern corresponding to an information signal array to be recorded on a magnetic recording medium, and the shape pattern is provided by arraying a ferromagnetic thin film deposited on a nonmagnetic substrate surface. The ferromagnetic thin film is either a soft magnetic film or semihard magnetic film having not more than 40 kA/m coercive force in track length direction of the information signals, and residual magnetization of the ferromagnetic thin film in the track length direction of the information signals is greater than coercive force of the magnetic recording medium. As a result, a master information carrier with superior magnetic recording performance can be obtained.

Abstract: A magnetic transfer apparatus is utilized to establish magnetization on the surface of a magnetic disk. A support mechanism supports the magnetic disk in the magnetic transfer apparatus. A magnetizing mechanism is designed to get opposed to the magnetic disk held by the support mechanism. The magnetizing mechanism applies a magnetic field of variable intensity in response to a change of position in the radial direction of the magnetic disk. The magnetic transfer apparatus enables establishment of a magnetic field of an appropriate intensity at any positions in the radial direction of the magnetic disk. Magnetization of a constant intensity can be established over the surface of the magnetic disk irrespective of a position in the radial direction of the magnetic disk. The magnetic transfer apparatus alone serves to establish a servo pattern of a clear magnetization on the magnetic disk.

Abstract: A magnetic transfer method for magnetically transferring information signals such as servo signals from a master medium to a slave medium, capable of reducing a range of signal missing due to insufficient contact of the two mediums originating from an adhering substance, thus enhancing signal quality. When the master medium bearing an information signal and the slave medium are brought into close contact with each other, a transferring magnetic field is applied thereto, thus magnetically transferring the information signal from the master medium to the slave medium. An elastic member made of a material having an elastic property so as to deform in accordance with a surface shape of the slave medium during contact pressure application and to restore to an original surface shape thereof during release of the slave medium from the master medium can be interposed between a back of the slave medium and a pressing surface of a pressing support member.

Abstract: An initialization magnetic field Hi as an external magnetic field is applied in a direction crossing (perpendicularly) the surface of the substrate 10 to initialize the medium 1, so that the first magnetic film 11 and the second magnetic film 12 can be initialized simultaneously. In this method for initializing a medium, the magnetization direction of the initialization magnetization H1i at the first magnetic film 11 and the magnetization direction of the initialization magnetization H2i at the second magnetic film 12 accord with each other with regard to a direction crossing the substrate 10.

Abstract: A magnetic transfer method which superposes on a magnetic disk surface a magnetic pattern from a master disk (2), said master disc having on its surface a magnetic film formed so as to have an array pattern shape corresponding to a preset data signal, magnetized into the magnetic film of the master disk (2). The master disc is used to magnetically transfer the array pattern of the data signal onto the magnetic disk as the magnetized pattern of the data signal. The method characterized comprises steps of contacting and separating, to and from a dummy disk (1) the magnetic film-formed surface of the master disk (2) to thereby clean the master disk (2), and a step of superposing, after the cleaning, the master disk (2) on the magnetic disk for effectuating the magnetic transfer.

Abstract: A magnetic transfer method, wherein the master carrier for magnetic transfer having a magnetic layer with a magnetic recording information recorded thereon is closely fitted to the slave medium where the information is to be transferred, and a magnetic recording information of the master carrier for magnetic transfer is transferred to the slave medium, whereby magnetization of the slave medium is performed by initial DC magnetization in track direction, and then, the master carrier for magnetic transfer is closely fitted to the slave medium processed by initial DC magnetization, a magnetic field for transfer is applied in a direction opposite to the direction of the initial DC magnetization on the surface of the slave medium, and magnetic transfer is performed, whereby relation between anisotropy field (Hk) of a master carrier for magnetic transfer and coercive force (Hc) of a slave medium satisfies the following condition: 4×10−4<(Hk/Hc)<2×10−1.

Abstract: A master information carrier (2) with an arranged pattern formed of a ferromagnetic film in a shape corresponding to information signals is superposed on a magnetic recording medium (1) and the arranged pattern formed of a ferromagnetic film is magnetized with a magnetizing head (6), thus transfer-recording the arranged pattern into the magnetic recording medium as a magnetized pattern. The magnetizing head includes an annular magnetic circuit with a gap, and a strength of a magnetic field applied to the master information carrier by magnetic flux leaking from portions other than the gap is set to be 20% or less of that of a magnetic field applied to the master information carrier by magnetic flux leaking from the gap. Quality deterioration due to various conditions during recording can be prevented and uniform recording with less variation depending on position on the magnetic recording medium is achieved.

Abstract: The present invention provides a method for magnetic transfer, said method comprising the steps of arranging permanent magnets each having magnetic field symmetrical to the axis of the magnetic pole at least on one of upper or lower surfaces of the slave medium with the axis of the magnetic pole disposed in parallel to the surface of the slave medium, rotating the slave medium or the permanent magnet in track direction, performing initial DC magnetization on the slave medium in advance in track direction, bringing the master carrier for magnetic transfer closely together with the slave medium processed by said initial DC magnetization, and performing magnetic transfer by applying magnetic field for transfer in track direction reverse to the direction of the initial DC magnetization on the surface of the slave medium.

Abstract: The invention provides a magnetic transfer method in which a magnetic transfer master carrier having a magnetic layer at a surface portion of a substrate having an information signal is brought in contact with a magnetic recording medium that is an associated slave medium and a transfer magnetic field is applied to the slave medium. The coercive force Hcs of the slave magnetic recording medium and the transfer magnetic field satisfies the relation: 0.6×Hcs≦transfer magnetic field≦1.

Abstract: A magnetic transfer apparatus for magnetically transferring information represented by a pattern of a magnetic layer formed on a master information carrier to a slave medium includes a magnet unit which applies an initial DC magnetic field to a slave medium and a magnet unit which applies a transfer magnetic field to the slave medium and the master information carrier in the direction opposite to the direction of the initial-magnetization with the slave medium held in close contact with the master information carrier. The initial DC magnetic field and the transfer magnetic field are not larger than the diameter of an innermost recording track in the half-width of a curve representing an intensity distribution in the direction of a tangent of the innermost recording track.

Abstract: When magnetically transferring information represented by a pattern of magnetic layer formed on a master information carrier to a disc-like slave medium, an initial DC magnetic field is applied to the slave medium to initially magnetize the slave medium in one direction of concentric recording tracks and a transfer magnetic field is applied to the slave medium in the direction opposite to the direction of the initial-magnetization with the initially-magnetized slave medium held in close contact with the master information carrier. At least one of applying the initial DC magnetic field and applying the transfer magnetic field is effected by applying the magnetic field while the slave medium is being rotated relatively to the magnetic field and stopping the rotation of the slave medium after the intensity of the magnetic field is gradually reduced to not stronger than a predetermined value.

Abstract: A master information carrier comprises a substrate whose surface has an embossed pattern corresponding to an information signal. At least a surface of the protruding portion of the embossed pattern is made of a ferromagnetic material. A method for writing an information signal into a sheet or disk magnetic record medium with a ferromagnetic thin film or coating is performed by putting the surface of the magnetic record medium into contact with the master information carrier so as to write a magnetized pattern corresponding to the embossed pattern of the master information carrier into the magnetic record medium.

Abstract: A master information carrier for magnetic transfer has a concentric irregularity pattern representing information to be transferred to a disc-like magnetic recording medium. The top surface of the protruding portions of the irregularity pattern is formed of magnetic material.

Abstract: Disclosed is a magnetic transfer apparatus capable of performing good magnetic transfer, including a holder for accommodating a master carrier with transfer patterns corresponding to transfer information, a slave-feeding unit for feeding a slave medium with a magnetic recording part to be transferred to the master carrier, and a magnetic field application unit for applying a magnetic field in a state that the slave medium is in close contact with the master carrier, wherein the holder is provided with a slave holding shaft for positioning a central opening of the slave medium at a central portion thereof, and an inner diameter of the central opening of the slave medium is set to be smaller than that of a central opening the master carrier, and the slave-feeding unit holds an inner diameter portion of the slave medium.

Abstract: Information represented by a pattern of a magnetic layer formed on a master information carrier is magnetically transferred to a slave. An initial DC magnetic field is applied to the slave medium with the slave medium supported from one side thereof so that the other side of the slave medium is directly opposed to the magnetic field generator, and a transfer magnetic field is applied to the slave medium and the master information carrier held in close contact with each other by a holder, which covers both the sides of the slave medium/master information carrier assembly, with the magnetic field generator positioned to oppose both the sides of the slave medium/master information carrier assembly so that the magnetic field generated by the magnetic field generator is applied to the slave medium and the master information carrier through the holder.

Abstract: A master-information magnetic recording apparatus for recording preformat information signals into a magnetic recording medium using a ferromagnetic film pattern formed on a master information carrier, in which the pattern corresponds to the preformat information signals. With the master information carrier in contact with the magnetic recording medium, the ferromagnetic film pattern is magnetized by a magnetic field applying device. Thus, the preformat information signals are recorded into the magnetic recording medium. The magnetic field applying device is so constructed that the direction of magnetizing the ferromagnetic film pattern is perpendicular to a track-scanning orbit of a magnetic head in a recording and reproducing apparatus in which the magnetic recording medium is installed. It enables the magnetic head to gain sufficient reproduction amplitude for track-scanning for reproducing the information signals.