Patents by Inventor Kazuyoshi Hanada
Kazuyoshi Hanada 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: 8274755Abstract: Embodiments of the present invention provide a magnetic disk unit capable of attaining miniaturization, lower cost, lighter weight, lower profile, and higher density. According to one embodiment, only a carriage and a spindle motor among respective constituent components of a hard disk drive (HDD) are securely attached to a support plate made of a hard metal material higher in rigidity than a shroud. All the constituent components of the HDD, except the carriage, and the spindle motor, (a voice coil motor, a ramp, a latch lever, an HDD connector and so forth), that is, the respective constituent components of the HDD, of which assembling precision, rigidity, and so forth are not required, are attached to the shroud small in wall-thickness, and lighter in weight, formed of a resin material such as plastics and so forth.Type: GrantFiled: July 18, 2007Date of Patent: September 25, 2012Assignee: Hitachi Global Storage Technologies, Netherlands B.V.Inventors: Yuuji Ishima, Kazuyoshi Hanada, Masaru Muranishi, Takashi Matsuki
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Patent number: 7894158Abstract: An embodiment of a magnetic disk apparatus in accordance with the present invention includes a magnetic recording medium, a magnetic head assembly having a magnetic head which reads and writes data on the magnetic recording medium, and a motor coil assembly rotationally driving a spindle motor rotation body, in which plural motor coils are arranged on a circumference around the rotation center of the spindle motor rotation body so that intervals in the circumferential direction are equal, in a stator base surrounding a periphery of the spindle motor rotation body and having a shape in which a prescribed moving locus portion of at least the magnetic head assembly is cut out.Type: GrantFiled: May 9, 2007Date of Patent: February 22, 2011Assignee: Hitachi Global Technologies Netherlands B.V.Inventors: Kazuyoshi Hanada, Masaru Muranishi, Takashi Matsuki, Yuuji Ishima
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Patent number: 7545601Abstract: Embodiments of the invention provide a magnetic disk drive promoting even higher densities, greater capacities, and further reduction in size, while relaxing component accuracy requirements. In one embodiment, the magnetic disk drive includes a magnetic disk receiving member and a magnetic disk holding member, a magnetic disk being rotatably held with the magnetic disk clamped therebetween. The receiving member makes a line contact with a surface of the magnetic disk on a circumference of a circle formed around a rotational axis of the magnetic disk.Type: GrantFiled: December 14, 2005Date of Patent: June 9, 2009Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kazuyoshi Hanada, Masaru Muranishi, Kenji Tomida, Yuji Ishima
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Patent number: 7441959Abstract: Embodiments of the invention prevent trouble caused by an increase in viscosity of grease generated when a ball bearing operates at a low temperature, and fretting that an inner ring and/or an outer ring comes in contact with balls to produce wear when vibration is applied thereto. In one embodiment, a ball bearing is configured such that a plurality of balls are arranged between an outer ring and an inner ring. Grease is filled between the balls, the inner ring and the outer ring. A holder is provided with a spring plate, and an extreme end thereof is always in contact with the balls. The spring plate is formed of a sufficiently softer material than the balls so as not to damage the balls. The mounted direction is one along the direction in which the balls are desired to be rotated. Appropriate spring pressurization can be applied to the balls at an angle defined by the holder and the spring plate in the root at which the holder is attached to the spring plate.Type: GrantFiled: December 19, 2005Date of Patent: October 28, 2008Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kazuyoshi Hanada, Masaru Muranishi, Yuji Ishima
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Publication number: 20080024930Abstract: Embodiments of the present invention provide a magnetic disk unit capable of attaining miniaturization, lower cost, lighter weight, lower profile, and higher density. According to one embodiment, only a carriage and a spindle motor among respective constituent components of a hard disk drive (HDD) are securely attached to a support plate made of a hard metal material higher in rigidity than a shroud. All the constituent components of the HDD, except the carriage, and the spindle motor, (a voice coil motor, a ramp, a latch lever, an HDD connector and so forth), that is, the respective constituent components of the HDD, of which assembling precision, rigidity, and so forth are not required, are attached to the shroud small in wall-thickness, and lighter in weight, formed of a resin material such as plastics and so forth.Type: ApplicationFiled: July 18, 2007Publication date: January 31, 2008Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Yuuji Ishima, Kazuyoshi Hanada, Masaru Muranishi, Takashi Matsuki
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Publication number: 20070263320Abstract: An embodiment of a magnetic disk apparatus in accordance with the present invention includes a magnetic recording medium, a magnetic head assembly having a magnetic head which reads and writes data on the magnetic recording medium, and a motor coil assembly rotationally driving a spindle motor rotation body, in which plural motor coils are arranged on a circumference around the rotation center of the spindle motor rotation body so that intervals in the circumferential direction are equal, in a stator base surrounding a periphery of the spindle motor rotation body and having a shape in which a prescribed moving locus portion of at least the magnetic head assembly is cut out.Type: ApplicationFiled: May 9, 2007Publication date: November 15, 2007Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kazuyoshi Hanada, Masaru Muranishi, Takashi Matsuki, Yuuji Ishima
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Publication number: 20060133707Abstract: Embodiments of the invention prevent trouble caused by an increase in viscosity of grease generated when a ball bearing operates at a low temperature, and fretting that an inner ring and/or an outer ring comes in contact with balls to produce wear when vibration is applied thereto. In one embodiment, a ball bearing is configured such that a plurality of balls are arranged between an outer ring and an inner ring. Grease is filled between the balls, the inner ring and the outer ring. A holder is provided with a spring plate, and an extreme end thereof is always in contact with the balls. The spring plate is formed of a sufficiently softer material than the balls so as not to damage the balls. The mounted direction is one along the direction in which the balls are desired to be rotated. Appropriate spring pressurization can be applied to the balls at an angle defined by the holder and the spring plate in the root at which the holder is attached to the spring plate.Type: ApplicationFiled: December 19, 2005Publication date: June 22, 2006Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kazuyoshi Hanada, Masaru Muranishi, Yuji Ishima
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Publication number: 20060126219Abstract: Embodiments of the invention provide a magnetic disk drive promoting even higher densities, greater capacities, and further reduction in size, while relaxing component accuracy requirements. In one embodiment, the magnetic disk drive includes a magnetic disk receiving member and a magnetic disk holding member, a magnetic disk being rotatably held with the magnetic disk clamped therebetween. The receiving member makes a line contact with a surface of the magnetic disk on a circumference of a circle formed around a rotational axis of the magnetic disk.Type: ApplicationFiled: December 14, 2005Publication date: June 15, 2006Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kazuyoshi Hanada, Masaru Muranishi, Kenji Tomida, Yuji Ishima
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Patent number: 6967813Abstract: The invention relates to the construction of an in-vehicle magnetic disk drive and a case for holding the in-vehicle magnetic disk drive. The in-vehicle magnetic disk drive must meet a condition peculiar thereto requiring normal operations under severe temperature conditions. An environment of an excessively low temperature disturbs a normal information recording operation, while an environment of an excessively high temperature makes the retention of recorded information impossible. The case is provided with a cold insulator, a heat insulator, a heat insulating material and a temperature sensor and is set in a specific position. The operation of the magnetic disk drive at temperatures outside a predetermined temperature range is inhibited.Type: GrantFiled: December 3, 2001Date of Patent: November 22, 2005Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Kazuyoshi Hanada, Shigeo Nakamura
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Patent number: 6965487Abstract: A control device for preventing abrasion inside bearings in an information recording and reproducing device mounted on an automobile and preventing degradation in rotational accuracy, the information recording and reproducing device including disk media holding information, heads for recording or reproducing information from the disk media, a carriage for turning to position the heads on surfaces of the disk, a bearing part permitting the carriage to turn, a spindle motor for rotatingly driving the disk media, and a bearing part of the spindle motor, the control device comprising a detecting unit for detecting a vehicle operating manner, which is carried out before vehicular vibrations are caused, and a control unit for starting rotation and/or starting swings the bearing part of the spindle motor and/or the bearing part of the carriage on the basis of a signal from the detecting unit.Type: GrantFiled: September 18, 2002Date of Patent: November 15, 2005Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Kazuyoshi Hanada, Osamu Beppu
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Patent number: 6728074Abstract: In a latch release apparatus and method, a latch mechanism holds an actuator with a high shock resistance. Two or more magnetic members are arranged in a latch component so as to concentrate a magnetic force for easy rotation of the latch component. The effect of the magnetic force in a direction perpendicular to the direction of rotation of the magnetic members becomes smaller, reducing the friction force at the rotational center of the latch.Type: GrantFiled: September 20, 2001Date of Patent: April 27, 2004Assignee: Hitachi, Ltd.Inventors: Kazuyoshi Hanada, Masao Iwakura, Yasuyuki Hozumi, Kazumi Fujimoto
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Patent number: 6717774Abstract: In a latch mechanism that holds an actuator with a high shock resistance two or more magnetic members are arranged in a latch component, which generates a weaker attraction force but a more easy rotation of the latch component. The structure concentrates a magnetic force in order to rotate the latch component effectively. The effect of the magnetic force in a direction perpendicular to the direction of rotation of the magnetic members becomes smaller and a friction force at the rotation center of the latch is reduced.Type: GrantFiled: September 20, 2001Date of Patent: April 6, 2004Assignee: Hitachi, Ltd.Inventors: Kazuyoshi Hanada, Masao Iwakura, Yasuyuki Hozumi, Kazumi Fujimoto
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Publication number: 20040037001Abstract: The invention relates to the construction of an in-vehicle magnetic disk drive and a case for holding the in-vehicle magnetic disk drive. The in-vehicle magnetic disk drive must meet a condition peculiar thereto requiring normal operations under a very severe temperature condition. An environment of an excessively low temperature disturbs a normal information recording operation, while an environment of an excessively high temperature makes the retention of recorded information impossible.Type: ApplicationFiled: October 22, 2003Publication date: February 26, 2004Inventors: Kazuyoshi Hanada, Shigeo Nakamura
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Publication number: 20030197967Abstract: A control device for preventing abrasion inside bearings in an information recording and reproducing device mounted on an automobile and preventing degradation in rotational accuracy, the information recording and reproducing device including disk media holding information, heads for recording or reproducing information from the disk media, a carriage for turning to position the heads on surfaces of the disk, a bearing part permitting the carriage to turn, a spindle motor for rotatingly driving the disk media, and a bearing part of the spindle motor, the control device comprising a detecting unit for detecting a vehicle operating manner, which is carried out before vehicular vibrations are caused, and a control unit for starting rotation and/or starting swings the bearing part of the spindle motor and/or the bearing part of the carriage on the basis of a signal from the detecting unit.Type: ApplicationFiled: September 18, 2002Publication date: October 23, 2003Inventors: Kazuyoshi Hanada, Osamu Beppu
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Publication number: 20020080528Abstract: A latch mechanism that holds an actuator with a high shock resistance is provided, whilst endeavoring to achieve a small, high-capacity apparatus, high-density recording, a constitution with high component density, low costs, and low consumption of electrical power.Type: ApplicationFiled: September 20, 2001Publication date: June 27, 2002Inventors: Kazuyoshi Hanada, Masao Iwakura, Yasuyuki Hozumi, Kazumi Fujimoto
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Publication number: 20020075603Abstract: A latch mechanism that holds an actuator with a high shock resistance is provided, whilst endeavoring to achieve a small, high-capacity apparatus, high-density recording, a constitution with high component density, low costs, and low consumption of electrical power.Type: ApplicationFiled: September 20, 2001Publication date: June 20, 2002Inventors: Kazuyoshi Hanada, Masao Iwakura, Yasuyuki Hozumi, Kazumi Fujimoto
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Patent number: 6233120Abstract: A magnetic disk device having a base and a cover; a magnetic disk recording information on a recording surface thereof facing the base or the cover; a spindle motor fixed to the base and rotating the magnetic disk; a head for recording and reproducing the information to and from the recording surface of the magnetic disk; a slider having the head mounted thereto; a first suspension supporting the slider; a head arm provided between the magnetic disk and the base or the cover and supporting the first suspension on the side of the recording surface; and a carriage fixed to the base and swinging the head arm, moving the head in a radial direction of the magnetic disk and positioning the head. The magnetic disk device also has a second suspension provided on the base side or the cover side of the head arm and having a natural frequency substantially equal to a natural frequency of the first suspension.Type: GrantFiled: November 19, 1999Date of Patent: May 15, 2001Assignee: Hitachi, Ltd.Inventors: Kazuyoshi Hanada, Toshihisa Okazaki, Satomitsu Iami, Masayuki Honchi, Hideyuki Takagi
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Patent number: 5995327Abstract: A magnetic disk device wherein a member having and suspension thereof a natural frequency similar to that of a head is disposed on an opposite surface of a head arm having one head mounted thereto via a suspension. The outermost shape (profile when the member is projected in a direction perpendicular to the surface of the magnetic disk) of the member having the natural frequency equal to that of the head and suspension thereof is similar to that of the head and the suspension or does not swell out from the profile of the head and the suspension. The member having the natural frequency similar to that of the head is provided to the head arm by the same device as that of the head.Type: GrantFiled: November 26, 1997Date of Patent: November 30, 1999Assignee: Hitachi, Ltd.Inventors: Kazuyoshi Hanada, Toshihisa Okazaki, Satomitsu Imai, Masayuki Honchi, Hideyuki Takagi
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Patent number: 5953178Abstract: A magnetic disk apparatus includes a dual head equipped with an MR head for reading data and an inductive head for writing the data. One ID portion and one servo pattern are disposed in one sector and an unequal track pitch is formed. The ID portion is formed at the center of a radius of two positions to which the MR head is positioned at the time of reading the data and writing the data, respectively.Type: GrantFiled: November 24, 1997Date of Patent: September 14, 1999Assignee: Hitachi, Ltd.Inventors: Akio Takatsuka, Hideaki Amano, Katsuhiro Tsuneta, Toshiaki Tsuyoshi, Tetsuji Kameoka, Haruhiko Hosokawa, Takashi Yamaguchi, Kazuyoshi Hanada, Satoru Yamaura, Toshio Matsushita, Toshihisa Okazaki
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Patent number: 5084793Abstract: The invention provides an improved mechanical apparatus having a driving mechanism for moving two movably contacting members relative to each other. The driving mechanism is combined with a temperature-displacement converter which drives the two members to be displaced relative to each other in response to a variation of the environmental temperature independently of operation of the driving mechanism. The temperature-displacement converter provides a fine displacement of the movable contacts in response to a variation of the environmental temperature to prevent a possible adhesive phenomenon between the two members or a possible increase of the sliding resistance between them, thereby preventing an adhesive phenomenon between a magnetic head of the CSS type and a magnetic disk of a magnetic disk device and so forth.Type: GrantFiled: December 11, 1989Date of Patent: January 28, 1992Assignee: Hitachi, Ltd.Inventors: Atsuo Ishida, Asao Sasamoto, Toshio Shiono, Kazuyoshi Hanada, Hideo Amano