摘要:
A favorable magnetic transfer is, performed on a perpendicular magnetic recording medium. A permanent magnet apparatus provided with two permanent magnets, each having a width extending the length of the radial direction of a discoid magnetic recording medium, is used as a transfer magnetic field generating means. A conjoined body formed of the perpendicular magnetic recording medium, which has been initially magnetized unidirectionally in the direction perpendicular to the track surface thereof, and two master mediums, disposed on respective surfaces of the slave medium, is inserted between the permanent magnets. A rotating means rotates the conjoined body, in the direction along the tracks of the slave medium, while a transfer magnetic field is applied to the conjoined body in the direction substantially opposite that in which the initial magnetization of the magnetic layer of magnetic recording medium has been performed, so as to perform the magnetic transfer.
摘要:
A method of producing a master information carrier by scanning a track a number of times. The method produces a master information carrier has a pattern of a magnetic layer representing information to be transferred to a high-density recording slave medium where the track width is not larger than 0.3 μm. The pattern is drawn by scanning a given track a plurality of times with an electron beam whose drawing diameter is smaller than the track width.
摘要:
A master information carrier for magnetic transfer includes a base sheet which is formed of a magnetic material. The master information carrier is provided with an irregularity pattern representing information to be transferred to a magnetic recording medium and a magnetic layer formed along the irregularity pattern. The saturation magnetization Mm of the magnetic layer and the saturation magnetization Ms of the base sheet satisfy the condition 1.0
摘要:
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.
摘要:
Front mount bases (14, 15) which are located at four corner portions under a cab (11) are constituted by base plates (14A, 15A) and fitting joint projections (14B, 15B), and rear mount bases (16, 17) are constituted by base plates (16A, 17A) and fitting joint projections (16B, 17B). On the other hand, front pillars (22, 23) to be erected on the front mount bases (14, 15) are provided with notched portions (22B, 23B) for fitting engagement with the fitting joint projections (14B, 15B), respectively. Rear pillars (24, 25) to be erected on the rear mount bases (16, 17) are provided with notched portions (24A, 25A) for fitting engagement with the fitting joint projections (16B, 17B). Accordingly, a weld can be formed along and between marginal edge portions around the fitting joint projections (14B, 15B, 16B, 17B) and notched portion (22B, 23B, 24A, 25A) in such a way as to increase the welding distance and to increase the strength of the welded joint portions.
摘要:
A cab for construction machines includes left and right rear pillars constituted by steel pipes of a diversified shape, with inclined intermediate pillar portions between upright lower pillar portions and upper pillar portions whereby positions of the lower and upper pillar portions are shifted in the forward and rearward directions, respectively. Lower portions of the rear pillars are receded in the forward direction to provide a recessed space, while upper portions of the rear pillars are projected out in the rearward direction to provide a rear expansion space. Accordingly, for the purpose of downsizing the upper structure (2), front portions of equipment, including an engine, can be accommodated in the recessed space and the rear expansion space contributes to broaden a space within the cab.
摘要:
A method for manufacturing a magnetic recording medium includes continuously conveying a support, applying a magnetic solution to the support to form a magnetic layer thereon, and subjecting the magnetic layer thus formed on the support to orientation and drying. The magnetic solution is prepared by dispersing magnetic particles therein such that the magnetization of the magnetic solution provided by a magnetic field having a predetermined field strength being applied thereto for one minute satisfies a relationship:M.sub.H /M.sub.S >2H/Hc,where M.sub.S is the saturation magnetization of the magnetic solution, Hc is the coercive force (Oe) of the ferromagnetic particles in the magnetic solution, and Hc/5.gtoreq.H.gtoreq.Hc/50.
摘要:
A process for fabricating a magnetic recording medium such as a disk medium having a uniformly high degree of magnetic particle randomization. The process includes steps of: forming a magnetic layer by applying a magnetic liquid to a continuously running support, and randomly orienting the magnetic layer by applying an AC magnetic field thereto while the magnetic layer is wet. The randomizing step is accomplished such that the magnetic field intensity of the applied AC magnetic field is 1/10 to 1/1 of the magnetic coercive force of the magnetic particles of the magnetic layer, and the frequency (Hz) of the field is set with respect to the running rate of the magnetic layer through the magnetic field so as to form a ratio to the application rate (m/min) within a range of 1/10 to 1/1.
摘要:
When writing the shapes of elements of a fine pattern on a substrate by microscopically vibrating the electron beam back and forth in a radial direction of the substrate or in a direction orthogonal to the radial direction and deflecting the electron beam in a direction orthogonal to the vibration direction to scan the electron beam so as to completely fill the shapes of the elements, a proximity-effect correction is performed according to the arrangement density of the elements in which the amount of dose is adjusted by setting the deflection speed faster for the writing of an element in a densely arranged region than for the writing of an identical element in a sparsely arranged region.
摘要:
When writing element shapes of a fine pattern on a substrate applied with a resist by scanning an electron beam thereon, ON/OFF control is performed for emitting the electron beam at a predetermined rotational position of the substrate by a blanking-OFF signal, performing writing in a rotational direction of the substrate along with the rotation of the substrate, and terminating the writing by a blanking-ON signal based on write data to perform writing for one round, and repeating the writing based on the ON/OFF control by moving the electron beam or substrate in a radial direction of the substrate and rotation control is performed for controlling the rotation speed of the rotation stage so as to be increased for inner track writing and decreased for outer track writing inversely proportional to the radius of the writing position.