Patents by Inventor Takehiko Eguchi
Takehiko Eguchi 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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Patent number: 11676629Abstract: In illustrative aspects, a system comprises an actuator; a control object, controlled by the actuator; and one or more processing devices. The one or more processing devices are configured to perform positioning control of the control object via the actuator, wherein performing the positioning control comprises: generating a feedforward polydyne positioning control input; and outputting the feedforward polydyne positioning control input to the actuator.Type: GrantFiled: January 14, 2022Date of Patent: June 13, 2023Assignee: Western Digital Technologies, Inc.Inventor: Takehiko Eguchi
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Patent number: 11646060Abstract: Various illustrative aspects are directed to a system comprising: an actuator; a control object, controlled by the actuator; and one or more processing devices, configured to perform positioning control of the control object via the actuator, wherein performing the positioning control comprises: generating a trajectory control signal for a trajectory that comprises a polydyne acceleration ramp; and outputting the trajectory control signal to the actuator.Type: GrantFiled: January 14, 2022Date of Patent: May 9, 2023Assignee: Western Digital Technologies, Inc.Inventor: Takehiko Eguchi
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Patent number: 11574649Abstract: A magnetic storage device that includes a housing, including a base, a cover, and an interior cavity. The magnetic storage device also includes an actuator controller, located in the interior cavity and configured to generate an actuator command signal. The magnetic storage device further includes an actuatable component, located in the interior cavity, and an actuator, located in the interior cavity and operable to actuate the actuatable component in response to the actuator command signal. The magnetic storage device also includes a vibration sensor, located in the interior cavity and configured to detect a vibration of the cover. The magnetic storage device further includes a sensor feedforward controller, located in the interior cavity and configured to generate a gain signal, based on the vibration of the cover detected by the vibration sensor, and to modify the actuator command signal proportional to the gain signal.Type: GrantFiled: November 4, 2021Date of Patent: February 7, 2023Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Takehiko Eguchi, Kazuhide Ichikawa
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Patent number: 10388327Abstract: A sound-attenuation part, such as for use in a rack-mount server, is configured for insertion into an orifice of a backplane to which at least one data storage device is coupled. The sound-attenuation part may include one or more pipes extending from a mounting portion. The sound-attenuation part helps to attenuate acoustic noise, such as from a cooling fan, which might otherwise reach the data storage device, such as through airflow orifices constituent to a backplane that is positioned between the fan and the storage device, while maintaining enough airflow through the backplane for system cooling purposes. Thus, degradation of the head positioning accuracy within the storage device, caused by the forces associated with this acoustic noise, may be reduced.Type: GrantFiled: February 28, 2017Date of Patent: August 20, 2019Assignee: Western Digital Technologies, Inc.Inventors: Takehiko Eguchi, Miki Namihisa, Kazuhide Ichikawa, Yohei Asai
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Publication number: 20180247677Abstract: A sound-attenuation part, such as for use in a rack-mount server, is configured for insertion into an orifice of a backplane to which at least one data storage device is coupled. The sound-attenuation part may include one or more pipes extending from a mounting portion. The sound-attenuation part helps to attenuate acoustic noise, such as from a cooling fan, which might otherwise reach the data storage device, such as through airflow orifices constituent to a backplane that is positioned between the fan and the storage device, while maintaining enough airflow through the backplane for system cooling purposes. Thus, degradation of the head positioning accuracy within the storage device, caused by the forces associated with this acoustic noise, may be reduced.Type: ApplicationFiled: February 28, 2017Publication date: August 30, 2018Inventors: Takehiko Eguchi, Miki Namihisa, Kazuhide Ichikawa, Yohei Asai
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Patent number: 10019043Abstract: Embodiments disclosed herein generally relate to a hard disk drive system with improved isolation from operational vibration. More particularly, embodiments disclosed herein provide a hard disk drive system with a vibration isolation frame and flexible connection without deviation from standard form factor. The standard form factor is the form factor of the hard disk drive with the base plate, but without the isolation frame. The hard disk drive with the isolation frame has the same form factor as the hard disk drive without the isolation frame, but with the base plate. Examples of form factors that may be utilized include the form factors for 3.5 inch and 2.5 inch hard disk drives. It is to be understood that 3.5 inch and 2.5 inch form factors are simply examples. Other size form factors are contemplated as well.Type: GrantFiled: December 14, 2015Date of Patent: July 10, 2018Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Takehiko Eguchi, Kenji Tomida, Toshihisa Okazaki
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Publication number: 20170168527Abstract: Embodiments disclosed herein generally relate to a hard disk drive system with improved isolation from operational vibration. More particularly, embodiments disclosed herein provide a hard disk drive system with a vibration isolation frame and flexible connection without deviation from standard form factor. The standard form factor is the form factor of the hard disk drive with the base plate, but without the isolation frame. The hard disk drive with the isolation frame has the same form factor as the hard disk drive without the isolation frame, but with the base plate. Examples of form factors that may be utilized include the form factors for 3.5 inch and 2.5 inch hard disk drives. It is to be understood that 3.5 inch and 2.5 inch form factors are simply examples. Other size form factors are contemplated as well.Type: ApplicationFiled: December 14, 2015Publication date: June 15, 2017Inventors: Takehiko EGUCHI, Kenji TOMIDA, TOSHIHISA OKAZAKI
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Patent number: 8922942Abstract: In a magnetic, disk apparatus, flows around disks are stabilized, flow-induced vibration generated in the disks and a head positioning actuator is reduced, and the positioning accuracy of the head is improved. In a magnetic disk apparatus including plural magnetic disks which are attached to a rotating motor and stacked with a spacer in between and a static structure that surrounds outer circumferences of the magnetic disks, plural current plates supported by the static structure are inserted between a pair of the magnetic disks in a stacking direction of the magnetic disks.Type: GrantFiled: June 9, 2011Date of Patent: December 30, 2014Assignee: Hitachi, Ltd.Inventors: Takehiko Eguchi, Shigeo Nakamura
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Publication number: 20140111883Abstract: In a magnetic, disk apparatus, flows around disks are stabilized, flow-induced vibration generated in the disks and a head positioning actuator is reduced, and the positioning accuracy of the head is improved. In a magnetic disk apparatus including plural magnetic disks which are attached to a rotating motor and stacked with a spacer in between and a static structure that surrounds outer circumferences of the magnetic disks, plural current plates supported by the static structure are inserted between a pair of the magnetic disks in a stacking direction of the magnetic disks.Type: ApplicationFiled: June 9, 2011Publication date: April 24, 2014Applicant: HITACHI, LTD.Inventors: Takehiko Eguchi, Shigeo Nakamura
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Patent number: 8630066Abstract: In a hard disk drive, for the purpose of solving a problem that a mass of the tip of a VCM actuator increases, a primary resonance frequency lowers and a control band lowers in a case where a balance driving mechanism which damps a vibration during the driving of a microactuator is mounted, a damping unit using a displacement enlargement mechanism by resonance is disposed to obtain a sufficient damping effect with a small mass, thereby setting a resonance frequency of the damping unit to be higher than a frequency of a resonance peak of a damping object. The hard disk drive includes a micromotion actuator for micromotion displacement which drives a head-gimbal assembly, and a micromotion actuator for damping which drives the damping unit so that the micromotion displacement direction of a magnetic head and the displacement direction of a mount portion have opposite phases.Type: GrantFiled: June 2, 2011Date of Patent: January 14, 2014Assignee: Hitachi, Ltd.Inventor: Takehiko Eguchi
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Publication number: 20130222947Abstract: A removable cover assembly for a data storage device comprises a first cover coupled with a casing base of a data storage device via a plurality of screws. A second cover is disposed upon a rib of the casing base and is coupled with the rib. The second cover is configured with a groove which delineates a perimeter separating an interior region of the second cover from an exterior region of the second cover. A space between the first cover and the casing base is filled with a low-density gas. The groove defines the region in the second cover in which separation of the interior region from the exterior region is to occur to expose the screws.Type: ApplicationFiled: February 29, 2012Publication date: August 29, 2013Inventors: Taisuke Sugii, Masaru Muranishi, Nobuyuki Isoshima, Takehiko Eguchi
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Patent number: 8077429Abstract: Embodiments in accordance with the present invention relate to greatly decreasing vibrations of a rotary disk at a portion where vibration on the disks is to be suppressed in a vibration-suppressing mechanism for rotary disks while enabling the rotary disks to be incorporated in the shroud surface. In one embodiment, the vibration-suppressing mechanism for rotary disks comprises at least one rotary disk and a shroud surface extending along and facing the outer circumferential edges of the disk. The shroud surface is so formed as to possess a portion where a gap between the outer circumferential edge of the disk and the shroud surface becomes small near a portion where the vibration of the disk is to be suppressed.Type: GrantFiled: March 14, 2007Date of Patent: December 13, 2011Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventor: Takehiko Eguchi
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Publication number: 20110299197Abstract: In a hard disk drive, for the purpose of solving a problem that a mass of the tip of a VCM actuator increases, a primary resonance frequency lowers and a control band lowers in a case where a balance driving mechanism which damps a vibration during the driving of a microactuator is mounted, a damping unit using a displacement enlargement mechanism by resonance is disposed to obtain a sufficient damping effect with a small mass, thereby setting a resonance frequency of the damping unit to be higher than a frequency of a resonance peak of a damping object.Type: ApplicationFiled: June 2, 2011Publication date: December 8, 2011Inventor: Takehiko EGUCHI
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Patent number: 7576944Abstract: Embodiments of the invention provide a magnetic disk device capable of improving the shielding function for the magnetic head yet maintaining a form factor. In one embodiment, a magnetic disk device comprises a magnetic disk; a magnetic head for recording/reproducing information; a magnetic disk drive mechanism for moving magnetic head in the radial direction of the magnetic disk; a housing including a base and a cover having a nonmagnetic material; and a magnetic shielding member having a magnetic material. The housing has a cut-away portion corresponding to a range in which the magnetic head moves, and the magnetic shielding member is formed in a U-shape including an upper wall portion, a side wall portion and a bottom wall portion. The magnetic shielding member covers the range in which the magnetic head moves, and is disposed in the cut-away portion so as to form substantially the same surface as the surfaces of the upper wall, side wall and bottom wall of the housing.Type: GrantFiled: September 30, 2005Date of Patent: August 18, 2009Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Takehiko Eguchi, Toshihiko Shimizu, Mikio Tokuyama
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Patent number: 7525759Abstract: Embodiments of the invention provide a magnetic disk device which improves the shielding function for the magnetic heads while maintaining a form factor having an inexpensive constitution. In one embodiment, a magnetic disk device comprises a rotary disk-type magnetic disk; a magnetic head for recording or reproducing information; a magnetic head support mechanism for supporting the magnetic head; a shroud having an opening in which the magnetic head support mechanism is inserted, and surrounding the outer circumference of the magnetic disk; and a housing. The housing includes a base and a cover, and accommodates the magnetic disk, the magnetic head, the magnetic head support mechanism and the shroud. The base is constituted by using a nonmagnetic material and the shroud is constituted by using a magnetic material.Type: GrantFiled: September 9, 2005Date of Patent: April 28, 2009Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Takehiko Eguchi, Masayuki Kurita, Toshihiko Shimizu, Mikio Tokuyama
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Patent number: 7520674Abstract: Embodiments of the invention make high-speed rotation of a magnetic disk, suppression of an increase in electric power consumption, and suppression in shaft falling vibration compatible together in a magnetic disk device. In one embodiment, a magnetic disk device comprises a magnetic disk that records information, and a drive unit that rotates the magnetic disk about a shaft. The drive unit comprises a rotary section that holds the magnetic disk, and a stationary section that supports the rotary section through a fluid bearing. The fluid bearing comprises a radial fluid bearing that bears a load in a direction perpendicular to an axial direction, and a thrust fluid bearing that bears a load in the axial direction. The thrust fluid bearing comprises a first thrust fluid bearing having a small diameter and a shallow clearance, and a second thrust fluid bearing positioned outside an outer periphery of a shaft and being larger in diameter and deeper in clearance than the first thrust fluid bearing.Type: GrantFiled: December 15, 2005Date of Patent: April 21, 2009Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Teruhiro Nakamiya, Takehiko Eguchi, Takashi Kouno, Hitoshi Shindo
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Patent number: 7468861Abstract: In a magnetic disk apparatus, a function of shielding a magnetic head is improved while maintaining the form factor with an inexpensive structure. In one embodiment, a magnetic disk apparatus has a magnetic disk, a magnetic head that records or plays back information, a magnetic head support mechanism supporting the magnetic head, a positioning mechanism that moves the magnetic head in a radial direction of the magnetic disk to place the head in position, an enclosure made of a nonmagnetic material, and a shield member made of a magnetic material. The magnetic disk, magnetic head, magnetic head support mechanism, positioning mechanism, and shield member are housed in the enclosure.Type: GrantFiled: September 9, 2005Date of Patent: December 23, 2008Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Takehiko Eguchi, Toshihiko Shimizu, Toshiya Shiramatsu, Mikio Tokuyama
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Vibration-suppressing mechanism for rotary disk information recording device and magnetic disk drive
Publication number: 20070230038Abstract: Embodiments in accordance with the present invention relate to greatly decreasing vibrations of a rotary disk at a portion where vibration on the disks is to be suppressed in a vibration-suppressing mechanism for rotary disks while enabling the rotary disks to be incorporated in the shroud surface. In one embodiment, the vibration-suppressing mechanism for rotary disks comprises at least one of rotary disk and a shroud surface extending along and facing the outer circumferential edges of the disk. The shroud surface is so formed as to possess a portion where a gap between the outer circumferential edge of the disk and the shroud surface becomes small near a portion where the vibration of the disk is to be suppressed.Type: ApplicationFiled: March 15, 2007Publication date: October 4, 2007Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventor: Takehiko Eguchi -
Publication number: 20060133705Abstract: Embodiments of the invention make high-speed rotation of a magnetic disk, suppression of an increase in electric power consumption, and suppression in shaft falling vibration compatible together in a magnetic disk device. In one embodiment, a magnetic disk device comprises a magnetic disk that records information, and a drive unit that rotates the magnetic disk about a shaft. The drive unit comprises a rotary section that holds the magnetic disk, and a stationary section that supports the rotary section through a fluid bearing. The fluid bearing comprises a radial fluid bearing that bears a load in a direction perpendicular to an axial direction, and a thrust fluid bearing that bears a load in the axial direction. The thrust fluid bearing comprises a first thrust fluid bearing having a small diameter and a shallow clearance, and a second thrust fluid bearing positioned outside an outer periphery of a shaft and being larger in diameter and deeper in clearance than the first thrust fluid bearing.Type: ApplicationFiled: December 15, 2005Publication date: June 22, 2006Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Teruhiro Nakamiya, Takehiko Eguchi, Takashi Kouno, Hitoshi Shindo
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Publication number: 20060072240Abstract: Embodiments of the invention provide a magnetic disk device capable of improving the shielding function for the magnetic head yet maintaining a form factor. In one embodiment, a magnetic disk device comprises a magnetic disk; a magnetic head for recording/reproducing information; a magnetic disk drive mechanism for moving magnetic head in the radial direction of the magnetic disk; a housing including a base and a cover having a nonmagnetic material; and a magnetic shielding member having a magnetic material. The housing has a cut-away portion corresponding to a range in which the magnetic head moves, and the magnetic shielding member is formed in a U-shape including an upper wall portion, a side wall portion and a bottom wall portion. The magnetic shielding member covers the range in which the magnetic head moves, and is disposed in the cut-away portion so as to form substantially the same surface as the surfaces of the upper wall, side wall and bottom wall of the housing.Type: ApplicationFiled: September 30, 2005Publication date: April 6, 2006Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Takehiko Eguchi, Toshihiko Shimizu, Mikio Tokuyama