Abstract: A ceramic heat exchanger includes a heat exchange section that heat-exchanges between two fluids A and B flowing opposite directions to each other. The heat exchange section includes ceramic blocks stacked one on top of another with a seal therebetween. The ceramic blocks have a plurality of parallel lines of flow channels, each line defined by the flow channels through which the same fluid flows, any two adjacent lines being defined by the flow channels through which the different fluids A and B flow respectively. Both ends in the stacking direction of the stack are bound to join and integrate the ceramic blocks with tightening means including end plates and a tie rod. A thermal expansion absorber is disposed on an external surface of the end plates for absorbing thermal expansion in the axial direction of the tie rod.

Abstract: There is provided a mold which contains at least two electroforming layers, wherein the mold has a concavo-convex pattern on a surface thereof, and the electroforming layers include at least two adjacent layers having the same crystal orientation.

Abstract: A method for producing a concaves-convex member having a concavo-convex pattern on a surface of a base material, including: forming a covering layer on surfaces of at least concave portions of an original master for producing a concavo-convex member, with a concavo-convex pattern provided on its surface; forming a barrier layer on a surface of the covering layer positioned at the at least concave portions of the original master; forming a base material by electrodepositing metal on a surface of the original master which is provided with the covering layer and the barrier layer on the at least concave portions; and separating, from the original master, the base material provided with the barrier layer and the covering layer over surfaces of at least convex portions, wherein a metal element contained in the barrier layer has an ionization tendency smaller than that of a metal element contained in the covering layer.

Abstract: The present invention provides a magnetic transfer master disk comprising: a master substrate formed by a metal plate, on a surface of which a protruding and recessed pattern corresponding to transfer information is transferred by electroforming, the metal plate being composed of two or more electroforming layers that are different from each other in crystal orientation; and a magnetic layer formed on the protruding and recessed pattern of the master substrate in order to eliminate warpage and distortion of the master disk even if the close contact pressure is increased during transferring magnetic information such as format information to a magnetic disk used in a hard disk device and the like.

Abstract: A master carrier for magnetic transfer, has: a support having an information writing region where a projection transfer pattern having a first projection is formed, the first projection corresponding to information to be transferred onto a magnetic recording medium; and a magnetic layer on the transfer pattern of the support, wherein the master carrier has a second projection on a surface of the support and the second projection is formed in a region where the information writing region isn't formed to sustain the region where the information writing region isn't formed while the magnetic recording medium and the support are brought into intimate contact with each other.

Abstract: A ceramic heat exchanger includes a heat exchange section that heat-exchanges between two fluids A and B flowing opposite directions to each other. The heat exchange section includes ceramic blocks stacked one on top of another with a seal therebetween. The ceramic blocks have a plurality of parallel lines of flow channels, each line defined by the flow channels through which the same fluid flows, any two adjacent lines being defined by the flow channels through which the different fluids A and B flow respectively. Both ends in the stacking direction of the stack are bound to join and integrate the ceramic blocks with tightening means including end plates and a tie rod. A thermal expansion absorber is disposed on an external surface of the end plates for absorbing thermal expansion in the axial direction of the tie rod.

Abstract: A method of manufacturing a stamper for an optical information recording medium includes the steps of: preparing a mother stamper having a surface layer in which a grooved pattern is formed; forming a conductive layer on the mother stamper; and forming a nickel layer on the conductive layer by electroplating the mother stamper in a plating solution consisting mainly of nickel sulfamate. In this method, during the process of forming the nickel layer, a current density is varied in at least two cycles, of which each cycle includes to increase, to maintain, and to decrease the current density sequentially in this order.

Abstract: A method of manufacturing a stamper for an optical information recording medium comprises the steps of: preparing a mother stamper having a surface layer in which a grooved pattern is formed; forming a conductive layer on the mother stamper; and forming an electroplating layer on the conductive layer by electroplating the mother stamper in a plating solution consisting mainly of nickel sulfamate. In this method, a current density is increased at a predetermined increasing rate at a start of electroplating.

Abstract: There is provided a mold which contains at least two electroforming layers, wherein the mold has a concavo-convex pattern on a surface thereof, and the electroforming layers include at least two adjacent layers having the same crystal orientation.

Abstract: The master carrier for magnetic transfer of the invention comprises a support and a magnetic layer formed on the surface of the support, wherein an uneven transfer pattern that corresponds to the information to be transferred to a magnetic recording medium is formed in the surface of the magnetic layer, and a relief is formed in the site where the transfer pattern is not formed.

Abstract: A process for producing a master carrier contains steps of: forming a desired pattern on a support to form a resist pattern support; forming a first ferromagnetic thin film on the resist pattern support by a vacuum film forming method; forming a third ferromagnetic thick film on the first ferromagnetic thin film by an electroplating; and peeling the support from the resist pattern support provided with the first ferromagnetic thin film and the third ferromagnetic thick film.

Abstract: A process for producing a master carrier contains steps of: forming a desired pattern on a support to form a resist pattern support; forming a first ferromagnetic thin film on the resist pattern support by a vacuum film forming method; forming a third ferromagnetic thick film on the first ferromagnetic thin film by an electroplating; and peeling the support from the resist pattern support provided with the first ferromagnetic thin film and the third ferromagnetic thick film.

Abstract: A method of manufacturing master disks for magnetic transferring, by which a metal disk of a prescribed thickness is formed by electroforming over an original disk on which a convexo-concave pattern matching transfer information is formed, a master substrate is fabricated from the metal disk peeled off the original disk, and a magnetic layer is formed over the convexo-concave pattern of the master substrate, the method comprising the steps of: monitoring either continuously or at prescribed intervals of time the content concentrations in an electroforming bath used for the electroforming, and carrying out bath adjustment to maintain the content concentrations in the electroforming bath within a prescribed range.

Abstract: The present invention provides a method of manufacturing a master disk for magnetic transfer, comprising the steps of: forming a metal plate having a predetermined thickness on an original plate having a concavo-convex pattern corresponding to information to be transferred; stamping the metal plate separated from the original plate to form a center opening and a circular rim, thereby providing a master substrate; and depositing a magnetic layer on the concavo-convex pattern of the master substrate, wherein a region at the upper edge of the center opening where a roll off occurs when the center opening of the master substrate is formed by stamping is defined as a center-opening roll-off region, a predetermined range of center-opening buffer region is provided outside of the center-opening roll-off region, and the concavo-convex pattern is formed outside of the center-opening buffer region.

Abstract: The present invention provides a magnetic transfer master disk comprising: a master substrate formed by a metal plate, on a surface of which a protruding and recessed pattern corresponding to transfer information is transferred by electroforming, the metal plate being composed of two or more electroforming layers that are different from each other in crystal orientation; and a magnetic layer formed on the protruding and recessed pattern of the master substrate in order to eliminate warpage and distortion of the master disk even if the close contact pressure is increased during transferring magnetic information such as format information to a magnetic disk used in a hard disk device and the like.

Abstract: A master carrier for magnetic transfer, has: a support having an information writing region where a projection transfer pattern having a first projection is formed, the first projection corresponding to information to be transferred onto a magnetic recording medium; and a magnetic layer on the transfer pattern of the support, wherein the master carrier has a second projection on a surface of the support and the second projection is formed in a region where the information writing region isn't formed to sustain the region where the information writing region isn't formed while the magnetic recording medium and the support are brought into intimate contact with each other.

Abstract: A process for producing a master carrier contains steps of: forming a desired pattern on a support to form a resist pattern support; forming a first ferromagnetic thin film on the resist pattern support by a vacuum film forming method; forming a third ferromagnetic thick film on the first ferromagnetic thin film by an electroplating; and peeling the support from the resist pattern support provided with the first ferromagnetic thin film and the third ferromagnetic thick film.

Abstract: The master carrier for magnetic transfer of the invention comprises a support and a magnetic layer formed on the surface of the support, wherein an uneven transfer pattern that corresponds to the information to be transferred to a magnetic recording medium is formed in the surface of the magnetic layer, and a relief is formed in the site where the transfer pattern is not formed.

Abstract: A magnetic recording medium includes a support, and a single magnetic layer having a thickness of 0.3 &mgr;m or less, which contains nonmagnetic particles. In the magnetic medium, the thickness of the single magnetic layer is equal to or larger than an average particle diameter of the nonmagnetic particles.

Abstract: A magnetic recording medium includes a support, and a single magnetic layer having a thickness of 0.3 &mgr;m or less, which contains nonmagnetic particles. In the magnetic medium, the thickness of the single magnetic layer is equal to or larger than an average particle diameter of the nonmagnetic particles.