Tatsugawa
Atsushi Tatsugawa, Kanagawa JP
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20100081010 | IMPRINT MOLD STRUCTURE, MAGNETIC RECORDING MEDIUM AND METHOD FOR PRODUCING THE MAGNETIC RECORDING MEDIUM - To provide an imprint mold structure for producing a magnetic recording medium, the imprint mold structure including: a first pattern corresponding to servo areas, a second pattern corresponding to data areas, and a shape corresponding to one or more non-patterned areas, wherein the magnetic recording medium includes the servo areas where servo data is to be recorded, and the data areas which include a pattern to write user data on, and wherein the data areas have the one or more non-patterned areas which do not include a pattern to write user data on and which are substantially concentric areas each composed of two or more adjacent tracks located in the data areas. | 04-01-2010 |
20100149673 | METHOD FOR TESTNG MOLD STRUCTURE, MOLD STRUCTURE, AND MAGNETIC RECORDING MEDIUM - A method for testing a mold structure including magnetically transferring a magnetic signal according to a concavo-convex pattern for a servo area in a mold structure to a perpendicular magnetic recording medium; electrically reproducing ≧50 tracks of the magnetic signal of servo data transferred onto the perpendicular magnetic recording medium using a magnetic head to obtain a reproduction signal; and calculating a pattern drawing accuracy radially from the reproduction signal to evaluate a performance of the mold structure including a disc-shaped base material; and the concavo-convex pattern for the servo area and a concavo-convex pattern for a data area formed on a base material surface following a desired design pattern. The concavo-convex patterns for the servo area are aligned in the radial direction of the base material, and the concavo-convex pattern for the data area are aligned in the circumferential direction between the concavo-convex patterns for the servo area. | 06-17-2010 |
Atsushi Tatsugawa, Minami-Ashigara-Shi JP
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20120021253 | LUBRICANT COMPOSITION AND USE THEREOF - [Problem] Provided is a novel lubricant composition that is useful as a material of a lubricating layer of a magnetic recording medium. | 01-26-2012 |
20120231297 | LUBRICANT COMPOSITION, FLUORINE-BASED COMPOUND, AND USE THEREOF - Disclosed is a lubricant composition comprising at least one kind of compound represented by following formula (1): | 09-13-2012 |
Atsushi Tatsugawa, Haibara-Gun JP
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20130292877 | NANOIMPRINTING METHOD - A mold equipped with a substrate having a fine pattern of protrusions and recesses and a mold release layer formed along the pattern of protrusions and recesses on the surface thereof is employed to press resist coated on a substrate, to form a resist pattern, to which the pattern of protrusions and recesses is transferred. The thickness of the mold release layer and the pressing force with which the mold is pressed against the resist are controlled such that the line width of the resist pattern becomes a desired value. The width of the lines of the resist pattern is controlled by this configuration. | 11-07-2013 |
Atsushi Tatsugawa, Odawara-Shi JP
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20150318013 | MULTILAYER OPTICAL INFORMATION RECORDING DISK AND METHOD FOR MANUFACTURING SAME - A multilayer optical information recording disk comprising a plurality of recording layers and intermediate layers provided between the plurality of recording layers, and a method for manufacturing the same are provided. At least one of two intermediate layers disposed adjacent to respective sides of one recording layer is made of adhesive. Each of the recording layers includes a polymer binder and a dye dispersed in the polymer binder or includes a polymer to which a dye is bonded. Each recording layer is configured such that the dye absorbs a recording beam and generates heat which deforms the recording layer, causing an interface between the recording layer and the intermediate layer made of adhesive to have a protrusive shape protruding into the intermediate layer, thereby recording information thereat. The interface between the recording layer and the recording layer made of adhesive has a groove for track-following servo control. | 11-05-2015 |
Kiyoshi Tatsugawa, Yonago JP
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20090196782 | POROUS LIQUID ABSORBING-AND-HOLDING MEMBER, PROCESS FOR PRODUCTION THEREOF, AND ALCOHOL ABSORBING-AND-HOLDING MEMBER - An object of the present invention is to provide a porous liquid absorbing-and-holding member having a high absorbing capacity for a liquid owing to capillarity and having in itself a structure capable of holding a large amount of the liquid, a process for producing this member, and a member for absorbing and holding an alcohol used as a fuel for a fuel cell. The porous liquid absorbing-and-holding member provided by the present invention is that including a porous sintered product having a skeleton formed by sintering of metal powder around voids and subjected to hydrophilicity-imparting treatment. The hydrophilicity-imparting treatment is preferably the formation of one or more substances selected from the group consisting of silicon oxides, titanium oxides, chromium oxides and aluminum oxide on the skeleton. | 08-06-2009 |