Yukio Yamamoto
Yukio Yamamoto, Toride JP
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20090284862 | HEAD POSITION CONTROL METHOD, HEAD POSITION CONTROL DEVICE, AND MAGNETIC RECORDING EVALUATION APPARATUS - A magnetic head position control method is provided to control a magnetic head to follow the track on a DTM disk by accurately detecting the eccentricity compensation amount through a simple process. An angle detection unit detects θ | 11-19-2009 |
20100079900 | MAGNETIC HEAD-POSITIONING SERVO SYSTEM, MAGNETIC HEAD TEST SYSTEM AND MAGNETIC DISK TEST SYSTEM - A magnetic head-positioning servo system is provided to accurately test a magnetic disk with a track written in advance, by providing two fine actuators. The second fine actuator, to which a magnetic head is attached, is mounted on the first fine actuator. The second fine actuator has a larger generating displacement than a generating displacement of the first fine actuator, and lets the magnetic disk to follow the eccentricity of the track. In this way, the positioning accuracy can be increased. | 04-01-2010 |
20110090590 | HEAD POSITION CONTROL DEVICE, MAGNETIC RECORDING EVALUATION APPARATUS, AND HEAD POSITION CONTROL METHOD - At time to start learning feed-forward control and under the status that servo-drive is not put in execution, a positioning error of repeatable runout is detected by means of a positioning error of repeatable runout operation section and on the basis of a value of the positioning error of repeatable runout, a drive pattern and drive interval of idling are determined by means of a feed-forward data operation section. The drive pattern is stored in a feed-forward data memory and is outputted as feed-forward data in synchronism with the rotation of a spindle during drive interval, thus performing idling of a fine-movement actuator. After the idling has ended, control initiation sequence is resumed to carry out learning of feed-forward control. | 04-21-2011 |
Yukio Yamamoto, Ritto-Shi JP
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20100276190 | ELECTRONIC COMPONENT AND METHOD OF MOUNTING THE SAME - An electronic component achieves significantly improved adhesion strength between an external electrode and a substrate body and includes an insulative substrate body, at least one groove disposed in at least one main surface of the substrate body, at least one external electrode disposed on the at least one main surface of the substrate body, wherein a portion of the at least one external electrode is disposed in at least a portion of the groove. | 11-04-2010 |
Yukio Yamamoto, Kokubunji-Shi JP
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20090073602 | SERVO INFORMATION WRITING METHOD, MAGNETIC HEAD TESTER AND MAGNETIC DISK TESTER USING THE SERVO INFORMATION WRITING METHOD - A mark information is recorded in an area which is on a circumference of a magnetic disk corresponding to a last track in which a servo information write is ended or a track, which is one or two in front of the last track in which servo information is not written and the mark information is detected by returning a magnetic head in a radial direction of the magnetic disk by a fine movement stage after the magnetic head is moved to a next aimed track by a coarse movement stage. The servo information write position is detected by the magnetic head and the servo information is written in a servo information write position of a next track by positioning the magnetic head therein by using the fine movement stage. | 03-19-2009 |
20100214686 | HEAD POSITIONING METHOD FOR ECCENTRIC TRACK AND HEAD POSITIONING CONTROL DEVICE - Drive waveforms with which extension and contraction characteristics of an actuator corresponding to a number of track eccentricity amounts are stored as data. By reading servo information written in a disk is obtained as a signal indicating a head displacement amount from a track. The head is moved in a direction in which the track is displaced by obtaining an amplitude corresponding to a slip amount of the head position and a rotation angle of maximum eccentricity, reading drive waveforms which is optimal in driving the actuator from the memory and driving the actuator with a drive waveform matched with the rotation angle at which the eccentricity is maximum. | 08-26-2010 |
Yukio Yamamoto, Kanagawa JP
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20100151128 | MASKING MECHANISM FOR FILM FORMING APPARATUS - It comprises a mask ( | 06-17-2010 |
Yukio Yamamoto, Sagamihara-Shi JP
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20090219217 | ANTENNA-CHARACTERISTIC MEASURING APPARATUS AND ANTENNA-CHARACTERISTIC MEASURING METHOD - A measured antenna and a measuring antenna are placed inside a radio anechoic container. On the basis of an aperture size D of the measured antenna, an aperture size d of the measuring antenna, and a wavelength λ of a measurement frequency, a distance L between the measured antenna and the measuring antenna is set to a value in the range of (D+d) | 09-03-2009 |
Yukio Yamamoto, Kawasaki JP
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20090183991 | CORROSION DETECTION METHOD AND MONITORING PATTERN USED THEREIN - A corrosion detection method detects galvanic corrosion occurring in a heterogeneous metal layer using a forming step and an observing step. The forming step is the step of forming the heterogeneous metal layer and a monitoring pattern by electrolytic plating a plurality of types of metal layers on a substrate. The observing step is the step of observing a surface of the monitoring pattern from above. The monitoring pattern has an identical structure of the heterogeneous metal layer. The monitoring pattern is in an area different from an area in which the heterogeneous layer is formed on the substrate. | 07-23-2009 |
Yukio Yamamoto, Anjo JP
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20080270013 | Vehicle position information providing devices, methods, and programs - Vehicle position information providing devices, methods, and programs acquire a first current position of a vehicle based on a radio signal received from a GPS satellite and acquire a second current position of the vehicle based on a signal received by a communication device that communicates over a mobile phone network. The devices, methods, and programs determine whether the first current position and the second current position coincide. If the first current position and the second current position do not coincide, the devices, methods, and programs cause the communication device to transmit information relating to the first current position to an information center. | 10-30-2008 |
20080270015 | Traffic situation determination systems, methods, and programs - Traffic situation determination systems, methods, and programs acquire a current position of the vehicle based on a radio signal received from a GPS satellite and determine a first travel path of the vehicle based on the acquired position of the vehicle. The systems, methods, and programs determine whether a road on which the vehicle is traveling has a traffic jam. If the road on which the vehicle is traveling has a traffic jam, the systems, methods and programs transmit first information relating to the first travel path from the vehicle to an information center. The systems, methods, and programs receive second information relating to a second travel path of the vehicle, the second information being received from a mobile phone communication center and being based on a mobile phone signal received by the mobile phone communication center. The systems, methods, and programs determine a road corresponding to the first travel path as having a traffic jam and determine a road corresponding to the second travel path, and not corresponding to the first travel path, as having no traffic jam. | 10-30-2008 |
Yukio Yamamoto, Hitachinaka JP
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20120250175 | INSPECTION DEVICE AND INSPECTION METHOD FOR INSPECTING MAGNETIC DISK OR MAGNETIC HEAD - The present invention realizes reduction of position information demodulation errors caused by the eccentricity of the magnetic disk and improvement of position signal detection accuracy, as well as enabling quick eccentricity clock correction for arbitrary clock frequencies. An inspection device in accordance with the present invention comprises: a servo demodulation unit which demodulates servo information; a PLL clock generating unit which generates a reference clock and supplies the reference clock to the servo demodulation unit; and a tester control unit. The PLL clock generating unit includes an eccentricity correction circuit for correcting the frequency of the reference clock depending on the eccentricity of the magnetic disk. The tester control unit generates correction data for correcting the frequency of the reference clock, multiplies the correction data by the inverse of a transfer function of the PLL clock generating unit, and supplies the product to the eccentricity correction circuit. | 10-04-2012 |
Yukio Yamamoto, Hitachi-Shi JP
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20130135769 | MAGNETIC HEAD INSPECTION APPARATUS AND MAGNETIC HEAD INSPECTION METHOD - In inspection for a magnetic head having a built-in fine-motion actuator, stable servo control is realized without an effect of thermal drift or thermal expansion. A magnetic head inspection apparatus includes a fine-motion stage, a data process circuit, and a servo control circuit. The fine-motion stage performs positioning of a magnetic head in a predetermined position on a magnetic disk. The data process circuit measures the movement characteristic of the fine-motion actuator. The servo control circuit controls the magnetic head to track the servo track on the magnetic disk based on a measurement result of the data process circuit. The servo control circuit drives the fine-motion stage, and controls the magnetic head to move in a manner that the value of movement of the fine-motion actuator remains within an acceptable range. | 05-30-2013 |