Patents by Inventor Yoshihito Sueoka
Yoshihito Sueoka 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: 11587580Abstract: A magnetic storage apparatus includes a disk-shaped magnetic recording medium, a motor which drives and rotates the magnetic recording medium, a magnetic head, including a first magnetic head element which reads information from the magnetic recording medium, and a second magnetic head element which writes information to the magnetic recording medium, and a bias circuit which supplies a predetermined bias voltage to the first magnetic head element. The magnetic recording medium has a laminated structure including a magnetic layer disposed above a substrate, and a carbon protective layer disposed above the magnetic layer. The bias circuit supplies to the first magnetic head element a voltage which is in a range of ?0.2 V to ?1.0 V with respect to a potential of the magnetic recording medium.Type: GrantFiled: April 8, 2022Date of Patent: February 21, 2023Assignee: SHOWA DENKO K.K.Inventors: Yoshihito Sueoka, Koji Itokazu, Noriya Seiki, Michitaka Takasaki
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Publication number: 20220343942Abstract: A magnetic storage apparatus includes a disk-shaped magnetic recording medium, a motor which drives and rotates the magnetic recording medium, a magnetic head, including a first magnetic head element which reads information from the magnetic recording medium, and a second magnetic head element which writes information to the magnetic recording medium, and a bias circuit which supplies a predetermined bias voltage to the first magnetic head element. The magnetic recording medium has a laminated structure including a magnetic layer disposed above a substrate, and a carbon protective layer disposed above the magnetic layer. The bias circuit supplies to the first magnetic head element a voltage which is in a range of ?0.2 V to ?1.0 V with respect to a potential of the magnetic recording medium.Type: ApplicationFiled: April 8, 2022Publication date: October 27, 2022Inventors: Yoshihito SUEOKA, Koji ITOKAZU, Noriya SEIKI, Michitaka TAKASAKI
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Patent number: 11380360Abstract: A storage apparatus includes a disk-shaped recording medium, a motor configured to drive and rotate the recording medium, a head configured to read information from and write information to the recording medium, and a support member configured to support the recording medium when the recording bends in response to external vibration or shock. The support member supports the recording medium by making contact with the recording medium only when the external vibration or shock is applied to the storage apparatus.Type: GrantFiled: December 1, 2020Date of Patent: July 5, 2022Assignee: SHOWA DENKO K.K.Inventors: Yoshihito Sueoka, Masato Fukushima
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Patent number: 11322180Abstract: A storage apparatus includes a disk-shaped recording medium having a surface, a motor configured to drive and rotate the recording medium, a head configured to read information from and write information to the recording medium, a ramp mechanism configured to move the head from a position above the surface of the recording medium to a head receded position, and a ramp retracting mechanism configured to move the ramp mechanism from a position above the surface of the recording medium to a ramp retracted position. Each of the head receded position and the ramp retracted position is outside a range of the recording medium in a plan view viewed from above the recording medium in a direction perpendicular to the surface of the recording medium.Type: GrantFiled: July 7, 2021Date of Patent: May 3, 2022Assignee: SHOWA DENKO K.K.Inventors: Yoshihito Sueoka, Masato Fukushima
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Publication number: 20210335389Abstract: A storage apparatus includes a disk-shaped recording medium having a surface, a motor configured to drive and rotate the recording medium, a head configured to read information from and write information to the recording medium, a ramp mechanism configured to move the head from a position above the surface of the recording medium to a head receded position, and a ramp retracting mechanism configured to move the ramp mechanism from a position above the surface of the recording medium to a ramp retracted position. Each of the head receded position and the ramp retracted position is outside a range of the recording medium in a plan view viewed from above the recording medium in a direction perpendicular to the surface of the recording medium.Type: ApplicationFiled: July 7, 2021Publication date: October 28, 2021Inventors: Yoshihito SUEOKA, Masato FUKUSHIMA
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Patent number: 11100952Abstract: A storage apparatus includes a disk-shaped recording medium having a surface, a motor configured to drive and rotate the recording medium, a head configured to read information from and write information to the recording medium, a ramp mechanism configured to move the head from a position above the surface of the recording medium to a head receded position, and a ramp retracting mechanism configured to move the ramp mechanism from a position above the surface of the recording medium to a ramp retracted position. Each of the head receded position and the ramp retracted position is outside a range of the recording medium in a plan view viewed from above the recording medium in a direction perpendicular to the surface of the recording medium.Type: GrantFiled: November 12, 2020Date of Patent: August 24, 2021Assignee: SHOWA DENKO K.K.Inventors: Yoshihito Sueoka, Masato Fukushima
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Publication number: 20210201951Abstract: A storage apparatus includes a disk-shaped recording medium, a motor configured to drive and rotate the recording medium, a head configured to read information from and write information to the recording medium, and a support member configured to support the recording medium when the recording bends in response to external vibration or shock. The support member supports the recording medium by making contact with the recording medium only when the external vibration or shock is applied to the storage apparatus.Type: ApplicationFiled: December 1, 2020Publication date: July 1, 2021Inventors: Yoshihito SUEOKA, Masato FUKUSHIMA
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Publication number: 20210166729Abstract: A storage apparatus includes a disk-shaped recording medium having a surface, a motor configured to drive and rotate the recording medium, a head configured to read information from and write information to the recording medium, a ramp mechanism configured to move the head from a position above the surface of the recording medium to a head receded position, and a ramp retracting mechanism configured to move the ramp mechanism from a position above the surface of the recording medium to a ramp retracted position. Each of the head receded position and the ramp retracted position is outside a range of the recording medium in a plan view viewed from above the recording medium in a direction perpendicular to the surface of the recording medium.Type: ApplicationFiled: November 12, 2020Publication date: June 3, 2021Inventors: Yoshihito SUEOKA, Masato FUKUSHIMA
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Patent number: 8951652Abstract: A substrate for a magnetic recording medium having a disc shape with a central hole is provided in which the surface roughness of the principal surface of the substrate is 1 angstrom or less in terms of root mean square roughness (Rq) when a space period (L) of an undulation in the circumferential direction is in the range 10 to 1,000 ?m, and in which when a component in the vertical axis direction of a line segment Z connecting a point A with the space period (L) of 10 ?m and a point B with the space period (L) of 1,000 ?m in a curve S marked on a double logarithmic graph which is obtained by analyzing the surface roughness using a spectrum and in which the horizontal axis is set to the space period (L) (?m) and the vertical axis is set to the power spectrum density (PSD) (k·angstrom2·?m) (where k is a constant) is defined as H and a displacement at which the component in the vertical axis direction of the curve S is the maximum with respect to the line segment Z is defined as ?H, a value (P) expressed by (?Type: GrantFiled: November 28, 2012Date of Patent: February 10, 2015Assignee: Showa Denko K.K.Inventors: Koji Yukimatsu, Yukihisa Matsumura, Yoshihito Sueoka, Junichi Kishimoto
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Publication number: 20080123215Abstract: A process for producing a hard disk device which is capable of producing a hard disk device having an excellent electromagnetic conversion characteristic at a high yield, and a process for adjusting flying height of a magnetic head having excellent reliability which is capable of improving the electromagnetic conversion characteristic of a hard disk device and preventing damage of a magnetic head derived from contact between a magnetic recording medium and a magnetic head are provided.Type: ApplicationFiled: November 27, 2007Publication date: May 29, 2008Applicant: SHOWA DENKO K.K.Inventors: Toshihiko Yoshikawa, Yoshihito Sueoka