Patents by Inventor Takahiro Imamura
Takahiro Imamura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20120234302Abstract: An evaporative fuel treatment apparatus for a vehicle is provided with a reverse flow preventing valve provided in a fuel supply pipe, a positioning plate provided on the fuel supply pipe, a pressing plate mounted slidably on the fuel supply pipe between the positioning plate the reverse flow preventing valve, a seal member clamped between the positioning plate and the pressing plate, and a stopper. When the fuel supply is started, the reverse flow preventing valve is configured to be set opened so as to form a liquid trap between the reverse flow preventing valve and the pressing plate. When the liquid surface reaches the pressing plate, the fuel pushes the pressing plate upward and the seal member is collapsed in the vertical direction so that the seal member protrudes toward the fuel supply gun insertion holes and makes tight contact with the fuel supply gun to seal a gap.Type: ApplicationFiled: February 15, 2012Publication date: September 20, 2012Inventors: Takeshi SHIMURA, Takahiro IMAMURA
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Publication number: 20120194944Abstract: According to one embodiment, a disk device rotates a disk information storage medium to record and reproduce information on the information storage medium by use of a head that slides in contact with a lubricant coated on the information storage medium, wherein a sliding speed U, area A and normal force N are set to cause U×A/N to fall within a monotonously increasing region in which a coefficient of friction associated with a frictional force occurring in a contact area of the head that faces the information storage medium monotonously increases as U×A/N increases, where the sliding speed U represents a sliding speed at a sliding time of the head, the area A represents the contact area of the head, and the normal force N represents a normal force applied to the contact area of the head.Type: ApplicationFiled: April 6, 2012Publication date: August 2, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yoshiaki IKAI, Takahiro IMAMURA, Yoshitaka SUZUKI
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Patent number: 8203801Abstract: According to one embodiment, a disk device rotates a disk information storage medium to record and reproduce information on the information storage medium by use of a head that slides in contact with a lubricant coated on the information storage medium, wherein a sliding speed U, area A and normal force N are set to cause U×A/N to fall within a monotonously increasing region in which a coefficient of friction associated with a frictional force occurring in a contact area of the head that faces the information storage medium monotonously increases as U×A/N increases, where the sliding speed U represents a sliding speed at a sliding time of the head, the area A represents the contact area of the head, and the normal force N represents a normal force applied to the contact area of the head.Type: GrantFiled: April 29, 2010Date of Patent: June 19, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Yoshiaki Ikai, Takahiro Imamura, Yoshitaka Suzuki
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Publication number: 20120134055Abstract: According to one embodiment, a head includes a head slider including a bearing surface and configured to fly by an airflow between the recording medium surface and the bearing surface, and a recording element and a reproduction element arranged in an outflow end portion of the head slider with respect to the airflow. The bearing surface includes a first pressure generating portion on an inflow end portion of the head slider with respect to the airflow, configured to generate a pressure, a second pressure generating portion on the outflow end portion, configured to generate a pressure, and a third pressure generating portion between the first and second pressure generating portions at a transverse central part of the bearing surface, configured to generate a pressure higher than that generated by the first pressure generating portion and lower than that generated by the second pressure generating portion.Type: ApplicationFiled: September 2, 2011Publication date: May 31, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Naozumi Tsuda, Akiyo Mizutani, Toru Watanabe, Takahiro Imamura
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Patent number: 8164859Abstract: A head slider includes a medium opposing surface configured to oppose a recording surface of a magnetic recording medium, a head element provided on the medium opposing surface, and an outlet end surface provided on a downstream side of the head element in a direction in which the magnetic recording medium moves relative to the head element, and extending substantially in a perpendicular direction from the medium opposing surface. The outlet end surface has a surface free energy greater than a surface free energy of the medium opposing surface.Type: GrantFiled: June 12, 2009Date of Patent: April 24, 2012Assignee: Toshiba Storage Device CorporationInventors: Takahiro Imamura, Hiroshi Chiba, Hiroyuki Kubotera
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Patent number: 8072702Abstract: An atmospheric pressure measuring apparatus allows a transmitter to transmit an acoustic wave for measurement of the atmospheric pressure. Air propagates the acoustic wave. A receiver receives the acoustic wave. Since the intensity of the acoustic wave changes to follow the variation of the atmospheric pressure, the atmospheric pressure can be measured based on the intensity of the acoustic wave received at the receiver. The atmospheric pressure is in this manner measured with such a simplified structure.Type: GrantFiled: January 30, 2009Date of Patent: December 6, 2011Assignee: Toshiba Storage Device CorporationInventors: Yoshitaka Suzuki, Takahiro Imamura
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Patent number: 8018674Abstract: According to one embodiment, in a disk drive, a voice coil motor is controlled to cause a head to minutely vibrate in a radial direction on a track of a disk. When the voice coil motor vibrates the head in the radial direction of the disk, frictional force occurring between the disk and the head is calculated based on the driving force of the voice coil motor generated to vibrate and detected positional information, thereby measuring frictional characteristics.Type: GrantFiled: February 19, 2010Date of Patent: September 13, 2011Assignee: Toshiba Storage Device CorporationInventors: Takahiro Imamura, Yoshitaka Suzuki, Yoshiaki Ikai
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Patent number: 8006562Abstract: A receiver receives an acoustic wave in an atmospheric pressure measuring apparatus. Since a variation in the intensity of an acoustic wave reflects a variation in the atmospheric pressure, the atmospheric pressure can be measured based on the intensity of the acoustic wave received at the receiver. The atmospheric pressure can in this manner easily be measured with a simplified structure.Type: GrantFiled: February 2, 2009Date of Patent: August 30, 2011Assignee: Toshiba Storage Device CorporationInventors: Yoshitaka Suzuki, Takahiro Imamura, Shinji Koganezawa
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Publication number: 20100265619Abstract: According to an embodiment, a magnetic storage medium includes a data area in and from which a magnetic head on a magnetic head slider records and reproduces data, the data area including an innermost peripheral radius Rid [m] and an outermost peripheral radius Rod [m]. If a rotational speed during recording and reproduction of the data is RPS [rps], waviness of the storage medium with a wavelength in a range between ?1 (=2×?×Rid×RPS/300,000) and ?2 (=2×?×Rod×RPS/100,000) is set to at most 0.05 nm in terms of a standard deviation value (sigma value).Type: ApplicationFiled: April 21, 2010Publication date: October 21, 2010Applicant: TOSHIBA STORAGE DEVICE CORPORATIONInventors: Koji MIYAKE, Takahiro IMAMURA
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Publication number: 20100259850Abstract: According to one embodiment, a storage device includes a recording medium, a head slider, a head suspension, an actuator, and an alternating current component generator. The head slider faces a surface of the recording medium. The head suspension supports the head slider. The actuator is incorporated in the head slider and increases the protruding length of a protrusion formed on the head slider toward the surface of the recording medium based on an increase in a supplied electrical signal. The alternating current component generator superimposes an alternating current component having a frequency equal to the natural frequency of the head suspension over the electrical signal while increasing or decreasing the protruding length of the protrusion at a predetermined amplitude.Type: ApplicationFiled: April 7, 2010Publication date: October 14, 2010Applicant: TOSHIBA STORAGE DEVICE CORPORATIONInventors: Koji MIYAKE, Tohru FUJIMAKI, Takahiro IMAMURA, Atsuo IIDA
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Publication number: 20100238582Abstract: According to one embodiment, a disk drive comprises a head and a heating actuator. The head is configured to slide over a rotating disk in contact with a surface of the disk. The heating actuator is configured to vary a state of contact between the head and the disk by being expanded by supplied heat. The head comprises the heating actuator.Type: ApplicationFiled: May 11, 2010Publication date: September 23, 2010Applicant: TOSHIBA STORAGE DEVICE CORPORATIONInventors: Yoshitaka SUZUKI, Takahiro IMAMURA, Yoshiaki IKAI
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Publication number: 20100238583Abstract: According to one embodiment, a disk device rotates a disk information storage medium to record and reproduce information on the information storage medium by use of a head that slides in contact with a lubricant coated on the information storage medium, wherein a sliding speed U, area A and normal force N are set to cause U×A/N to fall within a monotonously increasing region in which a coefficient of friction associated with a frictional force occurring in a contact area of the head that faces the information storage medium monotonously increases as U×A/N increases, where the sliding speed U represents a sliding speed at a sliding time of the head, the area A represents the contact area of the head, and the normal force N represents a normal force applied to the contact area of the head.Type: ApplicationFiled: April 29, 2010Publication date: September 23, 2010Applicant: TOSHIBA STORAGE DEVICE CORPORATIONInventors: Yoshiaki IKAI, Takahiro IMAMURA, Yoshitaka SUZUKI
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Publication number: 20100157456Abstract: According to one embodiment, in a disk drive, a voice coil motor is controlled to cause a head to minutely vibrate in a radial direction on a track of a disk. When the voice coil motor vibrates the head in the radial direction of the disk, frictional force occurring between the disk and the head is calculated based on the driving force of the voice coil motor generated to vibrate and detected positional information, thereby measuring frictional characteristics.Type: ApplicationFiled: February 19, 2010Publication date: June 24, 2010Applicant: TOSHIBA STORAGE DEVICE CORPORATIONInventors: Takahiro IMAMURA, Yoshitaka SUZUKI, Yoshiaki IKAI
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Publication number: 20100149692Abstract: According to one embodiment, a head slider includes a slider main body, a front rail, and at least a pair of grooves. The slider main body defines a base surface. The front rail rises from the base surface on the air inflow side of the slider main body and defines an air bearing surface on the top surface. The grooves are each formed in the front rail and define the air outflow end closer to the air inflow side than the air outflow end of the air bearing surface. The grooves are spaced apart in the slider width direction of the slider main body.Type: ApplicationFiled: December 14, 2009Publication date: June 17, 2010Applicant: TOSHIBA STORAGE DEVICE CORPORATIONInventors: Tohru FUJIMAKI, Takahiro IMAMURA, Hiroyuki KUBOTERA
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Publication number: 20100142093Abstract: According to one embodiment, a storage device includes a storage medium and a head slider. The storage medium includes a surface coated with a lubricant. The head slider includes a medium facing surface that faces a surface of the storage medium based on the relative movement to the storage medium. The product ph [atm·nm] of air pressure p [atm] defined between the surface of the storage medium and the medium facing surface and a floating amount h [nm] of the medium facing surface defined from the surface of the storage medium satisfies ph?0.0129 Mn+71.344 with respect to the molecular weight Mn of the lubricant.Type: ApplicationFiled: December 4, 2009Publication date: June 10, 2010Applicant: TOSHIBA STORAGE DEVICE CORPORATIONInventors: Hiroyuki KUBOTERA, Takahiro IMAMURA
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Publication number: 20100142094Abstract: According to one embodiment, a magnetic head slider includes: a magnetic head; a slider main body configured to be provided with the magnetic head; a first protrusion portion configured to be provided on the slider main body so as to abut the magnetic head; a second protrusion portion configured to be provided on a top surface of the first protrusion portion; and a cutout portion configured to be provided to an edge portion on the top surface of the second protrusion portion, the edge portion being on a side of the top surface.Type: ApplicationFiled: January 22, 2010Publication date: June 10, 2010Applicant: TOSHIBA STORAGE DEVICE CORPORATIONInventors: Tohru FUJIMAKI, Takahiro IMAMURA, Toru WATANABE
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Publication number: 20100103560Abstract: According to one embodiment, a head slider includes a slider main body, an element embedded film, a head element, and a plurality of recesses. The head element is embedded in the element embedded film. The recesses are distributed in a predetermined area formed on the trailing end surface of the element embedded film.Type: ApplicationFiled: September 22, 2009Publication date: April 29, 2010Applicant: FUJITSU LIMITEDInventors: Takahiro Imamura, Hiroyuki Kubotera
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Publication number: 20100103556Abstract: According to one embodiment, a storage device includes a storage medium, a head slider, and a heating element. The storage medium has a lubricating film on the surface. The head slider faces a surface of the storage medium on the medium facing surface. The heating element is embedded in the head slider, and applies heat to the lubricating film from the medium facing surface.Type: ApplicationFiled: September 17, 2009Publication date: April 29, 2010Applicant: FUJITSU LIMITEDInventors: Yoshitaka Suzuki, Takahiro Imamura
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Patent number: 7701676Abstract: A flying head slider includes a write head element and a read head element mounted on the slider body. A first transformable actuator serves to protrude the write head element toward a recording medium. A second transformable actuator serves to protrude the read head element toward the recording medium. The first and second transformable actuators can separately be controlled. The amount of protrusion can thus be individually controlled for the write head element and the read head element. The flying height can individually be set above the surface of the recording medium for the write head element and the read head element. Such an adjustment of the flying height enables the write head element and the read head element to simultaneously get closest to the recording medium.Type: GrantFiled: May 3, 2006Date of Patent: April 20, 2010Assignee: Toshiba Storage Device CorporationInventors: Hiroyuki Kubotera, Takahiro Imamura
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Patent number: 7657826Abstract: A method of estimating life of a head that reads information recorded in a recording medium includes detecting magnitude of an impact due to a contact between the head and the recording medium; and estimating the life of the head based on the magnitude of the impact detected.Type: GrantFiled: February 23, 2005Date of Patent: February 2, 2010Assignee: Toshiba Storage Device CorporationInventors: Takahiro Imamura, Kenrou Yamamoto