Patents by Inventor Shinji Koganezawa
Shinji Koganezawa 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: 8259418Abstract: According to one embodiment, a head suspension assembly includes an arm includes upper and lower surfaces, a suspension extending from the arm, a head supported by the suspension, and restriction plates bonded on the upper and lower surfaces of the arm. The restriction plates includes extending portions projecting from the arm to a downstream side of an airflow, respectively, and the extending portions are bent in a direction in which the extending portions approach each other.Type: GrantFiled: June 2, 2011Date of Patent: September 4, 2012Assignee: Kabushiki Kaisha ToshibaInventor: Shinji Koganezawa
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Patent number: 8098461Abstract: According to one embodiment, a micro actuator device, includes: a first piezoelectric element superposed on a first lower support plate coupled to a fixed plate; a second piezoelectric element superposed on a second lower support plate in parallel with the first lower support plate coupled to the fixed plate; a first upper support plate interposing the first piezoelectric element between the first upper support plate and the first lower support plate, and generating strain equal to strain of the first lower support plate when a tensile force of the first piezoelectric element acts on the first lower support plate; and a second upper support plate interposing the second piezoelectric element between the second upper support plate and the second lower support plate, and generating strain equal to strain of the second lower support plate when a tensile force of the second piezoelectric element acts on the second lower support plate.Type: GrantFiled: April 5, 2010Date of Patent: January 17, 2012Assignee: Toshiba Storage Device CorporationInventors: Yusuke Nojima, Shinji Koganezawa
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Publication number: 20120002321Abstract: According to one embodiment, a head suspension assembly includes an arm includes upper and lower surfaces, a suspension extending from the arm, a head supported by the suspension, and restriction plates bonded on the upper and lower surfaces of the arm. The restriction plates includes extending portions projecting from the arm to a downstream side of an airflow, respectively, and the extending portions are bent in a direction in which the extending portions approach each other.Type: ApplicationFiled: June 2, 2011Publication date: January 5, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventor: Shinji KOGANEZAWA
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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: 20110002066Abstract: According to one embodiment, an actuator arm includes a joint, an extension, a pair of outer surfaces, and a linear protrusion. The joint is rotatably supported on a shaft. The extension extends from the joint and has a tip end connected to a head that performs at least reading or writing with respect to a rotating disk recording medium. The outer surfaces are in a front-and-rear relationship with each other. At least one of the outer surfaces faces the disk recording medium. The linear protrusion is arranged on and extends along an edge of at least one of the outer surfaces. The edge is located upstream on the outer surfaces in a flowing direction of an air flow generated by the rotation of the disk recording medium.Type: ApplicationFiled: June 11, 2010Publication date: January 6, 2011Applicant: Toshiba Storage Device CorporationInventors: Shinji KOGANEZAWA, Shinichi Ohtsuka
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Publication number: 20100246071Abstract: According to one embodiment, a head suspension assembly includes a load beam supporting a head, and a microactuator configured to swing the load beam. The microactuator includes two piezoelectric elements configured to undergo shear deformation when supplied with a voltage and juxtaposed in such a manner that respective shear deformations thereof are opposite in direction, a first electrode and a second electrode arranged so as to hold the piezoelectric elements therebetween, and a support plate joined to the first electrode with an insulating layer therebetween and joined to the load beam to support the load beam.Type: ApplicationFiled: March 31, 2010Publication date: September 30, 2010Applicant: Toshiba Storage Device CorporationInventors: Yusuke NOJIMA, Shinji KOGANEZAWA
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Publication number: 20100238594Abstract: According to one embodiment, a head suspension assembly includes: a metal thin plate held by a head suspension; a fixed plate formed in the metal thin plate and joined to the head suspension; a supporting plate formed in the metal thin plate on the front side of the fixed plate and supporting a head slider on a surface thereof and held on a rear surface thereof by a protrusion formed on the head suspension; an arm formed in the metal thin plate and extending from the fixed plate to the supporting plate and allowing a change in a posture of the supporting plate; an insulating layer extending from the fixed plate to the supporting plate and supported by the arm; a wiring pattern formed on the insulating layer; and a visco-elastic body arranged on a flat surface formed on the arm, the insulating layer, or the wiring pattern.Type: ApplicationFiled: March 18, 2010Publication date: September 23, 2010Applicant: TOSHIBA STORAGE DEVICE CORPORATIONInventors: Kenzo NAKAMURA, Shinji KOGANEZAWA, Takuma KIDO
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Publication number: 20100195251Abstract: According to one embodiment, a micro actuator device, includes: a first piezoelectric element superposed on a first lower support plate coupled to a fixed plate; a second piezoelectric element superposed on a second lower support plate in parallel with the first lower support plate coupled to the fixed plate; a first upper support plate interposing the first piezoelectric element between the first upper support plate and the first lower support plate, and generating strain equal to strain of the first lower support plate when a tensile force of the first piezoelectric element acts on the first lower support plate; and a second upper support plate interposing the second piezoelectric element between the second upper support plate and the second lower support plate, and generating strain equal to strain of the second lower support plate when a tensile force of the second piezoelectric element acts on the second lower support plate.Type: ApplicationFiled: April 5, 2010Publication date: August 5, 2010Applicant: TOSHIBA STORAGE DEVICE CORPORATIONInventors: Yusuke NOJIMA, Shinji KOGANEZAWA
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Publication number: 20100134928Abstract: According to one embodiment, a head suspension assembly includes: a head slider; a fixed piece supported on a surface of a platy gimbal; a first arm configured to extend from the fixed piece, be connected to the head slider, and include a platy first flexible portion that extends, between the fixed piece and the head slider, along a first virtual plane perpendicular to the surface of the gimbal; a second arm configured to extend from the fixed piece, be connected to the head slider, and include a platy second flexible portion configured to extend along a second virtual plane that is perpendicular to the surface of the gimbal and that intersects with the first virtual plane at an intersection angle less than 180 degrees; a first piezoelectric element joined to the first flexible portion; and a second piezoelectric element joined to the second flexible portion.Type: ApplicationFiled: February 2, 2010Publication date: June 3, 2010Applicant: TOSHIBA STORAGE DEVICE CORPORATIONInventors: Yusuke NOJIMA, Shinji KOGANEZAWA
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Publication number: 20100097728Abstract: According to one embodiment, a head suspension assembly includes: a head slider; a fixed piece configured to be fixed to the head slider; a flexible long piece configured to extend from the fixed piece and to be connected to a head suspension; an arm piece configured to be connected to the head suspension at one end and slidably contact a surface of the head slider at other end; and a piezo element configured to be attached to the arm piece.Type: ApplicationFiled: December 28, 2009Publication date: April 22, 2010Applicant: TOSHIBA STORAGE DEVICE CORPORATIONInventor: Shinji KOGANEZAWA
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Publication number: 20100007983Abstract: According to an aspect of the embodiment, a magnetic recording apparatus has a sensor detecting a first signal including disk flutter and arm flexural vibration and a sensor for detecting a second signal only including the arm flexural vibration. The magnetic recording apparatus obtains the frequency component of disk flutter based on the first signal and second signal, and executes the control of positioning a head based on the obtained frequency component of the disk flutter.Type: ApplicationFiled: June 30, 2009Publication date: January 14, 2010Applicant: FUJITSU LIMITEDInventors: Kei Funabashi, Shinji Koganezawa
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Publication number: 20090288491Abstract: 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: ApplicationFiled: February 2, 2009Publication date: November 26, 2009Applicant: FUJITSU LIMITEDInventors: Yoshitaka Suzuki, Takahiro Imamura, Shinji Koganezawa
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Publication number: 20090284870Abstract: An arm has one end coupled to a head suspension and the other end defining a domed surface in a head suspension assembly. The domed surface establishes point contact against the side surface of a head slider. The arm is designed to restrain the direction of application of a force along an imaginary plane including the back surface of the head slider. A piezoelectric element is bonded to the arm at a position between the one end and the other end of the arm. The head suspension assembly allows the arm to curve in response to expansion/shrinkage of the piezoelectric element. A driving force is applied from the arm to the head slider based on the curvature of the arm. Since point contact is established between the arm and the side surface of the head slider, the curvature of the arm cannot be restrained.Type: ApplicationFiled: January 26, 2009Publication date: November 19, 2009Applicant: FUJITSU LIMITEDInventors: Yusuke Nojima, Shinji Koganezawa
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Publication number: 20090268345Abstract: A disk device has a head reading/writing data from and to a disk medium, a head slider supporting the head, a head suspension having a gimbal mounting the head slider, gimbal supports supporting the gimbal, traces having a wirings pattern, and a carriage arm supporting the head suspension. Further, the disk device has vibration sensors, each of the vibration sensors arranged at each side of a centerline of the head slider along a longitudinal direction of the head suspension and a signal processing circuit processing output signals from the vibration sensors so as to remove up/down vibration components.Type: ApplicationFiled: December 19, 2008Publication date: October 29, 2009Applicant: FUJITSU LIMITEDInventor: Shinji Koganezawa
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Patent number: 7551399Abstract: A plate member is made of a metal material lighter than stainless steel in a suspension for a head slider. This leads to a reduction in the weight of the suspension. The natural frequency of the suspension is thus raised. Moreover, the viscoelastic member is interposed between the front surface of the plate member and the back surface of the flexure. This structure allows either the plate member or the flexure to act as a base and the other to act as a constraining member. In other words, the plate member, the flexure and the viscoelastic member in combination act as a so-called vibration damper including constraining layers. The viscoelastic member serves to further suppress vibration of the plate member and the flexure.Type: GrantFiled: November 22, 2005Date of Patent: June 23, 2009Assignee: Fujitsu LimitedInventors: Takuma Kido, Keiji Aruga, Shinji Koganezawa, Toru Watanabe
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Publication number: 20090122438Abstract: For a feedforward controller for controlling a position of a magnetic head in a magnetic disk drive, a vibration of the magnetic head is measured in a state in which a magnetic disk is rotated in the magnetic disk drive. From a spectrum of the measured vibration, a flutter frequency which is a frequency of a vibration caused by the magnetic disk fluttering is obtained. A filter is designed for each flutter frequency having a peak of a gain for a respective one of obtained flutter frequencies. The feedforward controller for controlling a position of the magnetic head is obtained by combining filters designed for the respective flutter frequencies.Type: ApplicationFiled: September 4, 2008Publication date: May 14, 2009Applicant: FUJITSU LIMITEDInventors: Takuji Matsuzawa, Shinji Koganezawa, Takeyori Hara, Kei Funabashi, Shinichi Ohtsuka
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Publication number: 20090052085Abstract: A head slider has a medium-opposed surface opposed to a storage medium at a distance in a storage apparatus. The medium-opposed surface receives airflow through relative movement between the storage medium and the head slider. The flexure holds the head slider at a predetermined mounting area. The head slider flies above the storage medium in a pitched attitude. A predetermined pitch angle is established in the pitched attitude. An actuator serves to deform the flexure outside the mounting area for the head slider so as to forcefully change the pitched attitude within a predetermined range of a pitch angle. A change in the pitched attitude, namely a change in the pitch angle results in a change in the flying height of the head slider. The flying height can be changed without changing the design of the head slider.Type: ApplicationFiled: October 29, 2008Publication date: February 26, 2009Applicant: FUJITSU LIMITEDInventor: Shinji Koganezawa
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Publication number: 20080229842Abstract: A suspension for a hard disk drive has a vibration sensor which is impervious to influence by external noise, to obtain more stable positioning precision of the head on the suspension. The suspension has a load beam, a vibration sensor sandwiched by a first electrode and a second electrode, and a conductive wiring pattern on the load beam for electrically connecting the first electrode and the second electrode to an external detection circuit. The first electrode is sandwiched by the second electrode via the vibration sensor and a shield layer via an insulating layer. The second electrode and the shield layer are at a same potential.Type: ApplicationFiled: February 21, 2008Publication date: September 25, 2008Applicant: FUJITSU LIMITEDInventors: Shinichi Ohtsuka, Shinji Koganezawa
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Publication number: 20080049361Abstract: Connecting pieces extend outward from the support plate in the opposite directions along a crossline. A flexure body is connected to the connecting pieces. A pad is fixed to the support plate at a position ahead of the crossline. A wiring pattern extends from a pad. The wiring pattern defines a first straight portion extending forward from the flexure body along a first straight line. A second straight portion extends along a second straight line intersecting with the first straight line. A curved portion connects the first straight portion to the second straight portion. The curved portion expands outward from at least one of the first and second straight lines. The support plate merely suffers from a bending at a position ahead of the imaginary crossline even if the solder generates a stress based on its shrinkage. The wiring pattern serves to absorb the stress.Type: ApplicationFiled: January 9, 2007Publication date: February 28, 2008Inventors: Hiroaki Kushima, Shinji Koganezawa, Takeshi Ohwe, Takuma Kido, Yasuo Suzuki
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Patent number: 7215068Abstract: A piezoelectric element of a piezoelectric actuator is clamped by two electrodes, each of which has a conductive layer on a insulating layer. At least a connection terminal is formed by extending the conductive layer outside the insulating layer.Type: GrantFiled: August 30, 2004Date of Patent: May 8, 2007Assignees: Fujitsu Limited, NHK Spring Co., Ltd.Inventors: Shinji Koganezawa, Hideki Kashima