Patents by Inventor Ryuji Tsuchiyama
Ryuji Tsuchiyama 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: 8848318Abstract: Provided is a magnetic head slider apparatus that can minimize a change in a roll angle caused by an impact force even with a submount mounted on a side surface thereof and achieve steady flying with the roll angle minimized. A dimple position and a pressure center position of a lifting force are moved in a slider width direction to thereby align a center of mass of a slider having a submount including a laser diode mounted on a side surface thereof, the dimple position, and the pressure center position of the lifting force with each other. This provides a magnetic head slider and a suspension thereof, and a magnetic disk drive apparatus offering higher recording density and higher reliability.Type: GrantFiled: May 12, 2011Date of Patent: September 30, 2014Assignee: Hitachi, Ltd.Inventors: Ryuji Tsuchiyama, Takuya Matsumoto, Irizo Naniwa
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Publication number: 20140104996Abstract: Provided is a magnetic head slider apparatus that can minimize a change in a roll angle caused by an impact force even with a submount mounted on a side surface thereof and achieve steady flying with the roll angle minimized. A dimple position and a pressure center position of a lifting force are moved in a slider width direction to thereby align a center of mass of a slider having a submount including a laser diode mounted on a side surface thereof, the dimple position, and the pressure center position of the lifting force with each other. This provides a magnetic head slider and a suspension thereof, and a magnetic disk drive apparatus offering higher recording density and higher reliability.Type: ApplicationFiled: May 12, 2011Publication date: April 17, 2014Inventors: Ryuji Tsuchiyama, Takuya Matsumoto, Irizo Naniwa
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Publication number: 20120008231Abstract: There is provided the magnetic head slider including a reader, a writer, and a heater. A contact surface coming into contact with a medium surface when power is applied to the heater, and a step surface formed on both sides of the contact surface, through the intermediary of a step part, are provided on respective surfaces of the upper shield layer, the lower shield layer, the lower magnetic pole, the shield layer, and the return pole, the respective surfaces being opposite to a disk. And the respective contact surfaces of the upper shield layer, the lower shield layer, the lower magnetic pole, the shield layer, and the return pole are configured so as to be substantially circular in shape, as a whole, thereby providing a cylindrical small pad on a surface of a magnetic head slider, opposite to the disk.Type: ApplicationFiled: June 8, 2011Publication date: January 12, 2012Inventors: RYUJI TSUCHIYAMA, Atsuko OKAWA, Daisuke SATO, Mitsuhiro HASHIMOTO
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Patent number: 7936536Abstract: In a discrete track medium and a patterned medium, a meniscus adsorptive force is reduced and writing into adjacent tracks is prevented. A magnetic layer in lands or patterns in the discrete track medium or the patterned medium is formed into a cylindrical shelly or spherical shelly shape with a uniform thickness. Moreover, a height of cylindrical shelly land or a height of spherical shelly land is changed between 5 nm and 30 nm according to radial positions. Thus, an effect is achieved for providing a magnetic recording medium and a magnetic disk apparatus which are excellent in realizing higher recording density and higher reliability.Type: GrantFiled: July 20, 2007Date of Patent: May 3, 2011Assignee: Hitachi, Ltd.Inventors: Ryuji Tsuchiyama, Masahumi Mochizuki, Kyosuke Ono, Yuko Tsuchiya, Hiroshi Ikekame
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Patent number: 7474504Abstract: A magnetic head slider including: a head element which records or reproduces information on a magnetic disk, a slider having said head element, and an electric conducting film in which paired first and second parts are formed to be substantially parallel, where current flows within said first and second parts are in the opposite direction as against said slider.Type: GrantFiled: October 25, 2005Date of Patent: January 6, 2009Assignee: Hitachi, Ltd.Inventors: Junguo Xu, Ryuji Tsuchiyama, Mikio Tokuyama, Masaaki Matsumoto
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Publication number: 20080297949Abstract: When a piezoelectric element is deformed in the direction of decreasing a flying height, a pressure at a trailing pad increases, and the flying height of a magnetic head is not efficiently decreased and may be increased conversely in some occasions. A position of contact between a suspension and a dimple is set toward a leading edge with respect to a piezoelectric element, and a pad for generating a positive pressure is disposed between the dimple and the piezoelectric element in addition to a trailing pad. Fluctuations of a positive pressure generated toward the leading edge with respect to the dimple are thus suppressed when the piezoelectric element is deformed.Type: ApplicationFiled: May 29, 2008Publication date: December 4, 2008Inventors: Irizo Naniwa, Junguo Xu, Ryuji Tsuchiyama
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Patent number: 7385786Abstract: A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first surface and a second surface provided at an air-outflow side at positions with respect to the first surface, and projections having a cylindrical shape are provided on a third surface at an air-inflow side at positions with respect to said first surface.Type: GrantFiled: June 26, 2006Date of Patent: June 10, 2008Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Mikio Tokuyama, Mieko Ishii, Ryuji Tsuchiyama, Youichi Kawakubo, Hiromitsu Tokisue
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Publication number: 20080049359Abstract: In a discrete track medium and a patterned medium, a meniscus adsorptive force is reduced and writing into adjacent tracks is prevented. A magnetic layer in lands or patterns in the discrete track medium or the patterned medium is formed into a cylindrical shelly or spherical shelly shape with a uniform thickness. Moreover, a height of cylindrical shelly land or a height of spherical shelly land is changed between 5 nm and 30 nm according to radial positions. Thus, an effect is achieved for providing a magnetic recording medium and a magnetic disk apparatus which are excellent in realizing higher recording density and higher reliability.Type: ApplicationFiled: July 20, 2007Publication date: February 28, 2008Inventors: RYUJI TSUCHIYAMA, Masahumi Mochizuki, Kyosuke Ono, Yuko Tsuchiya, Hiroshi Ikekame
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Publication number: 20060250717Abstract: A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first surface and a second surface provided at an air-outflow side at positions with respect to the first surface, and projections having a cylindrical shape are provided on a third surface at an air-inflow side at positions with respect to said first surface.Type: ApplicationFiled: June 26, 2006Publication date: November 9, 2006Inventors: Mikio Tokuyama, Mieko Ishii, Ryuji Tsuchiyama, Youichi Kawakubo, Hiromitsu Tokisue
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Patent number: 7072146Abstract: A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first positive pressure generating portion provided at an air-inflow side and a positive pressure generating portion surface provided at an air-outflow side, projections being provided at the air-inflow side at positions with respect to the first positive pressure generating portion on a first surface which faces the magnetic disk upon read/write operation of the magnetic head slider, and a step surface provided at the air-inflow side with respect to said first positive pressure generating portion.Type: GrantFiled: June 16, 2005Date of Patent: July 4, 2006Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Mikio Tokuyama, Mieko Ishii, Ryuji Tsuchiyama, Youichi Kawakubo, Hiromitsu Tokisue
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Patent number: 7042678Abstract: A magnetic head slider in which a leading pad is projected in a thicknesswise direction of the slider, in comparison with a trailing pad so as to reduce vibration caused by contact between a flat medium surface of a disc and the slider carrying thereon a magnetic head, to reduce variation in flying height caused by wavy unevenness of the medium surface, and to reduce variation in atmospheric pressure around the slider, thereby it is possible to enhance the recording density and the reliability of the magnetic head slider while reducing the costs thereof. Further, a magnetic disc unit using the above-mentioned magnetic head slider.Type: GrantFiled: June 25, 2003Date of Patent: May 9, 2006Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Ryuji Tsuchiyama, Hiroshi Tani, Mikio Tokuyama, Hidekazu Kohira, Masayuki Kurita, Mitsuhiro Shoda, Junguo Xu, Masaaki Matsumoto
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Patent number: 7038883Abstract: A magnetic head slider mounted on a magnetic disk unit for supporting a magnetic head that writes and reads information to and from a magnetic disk is constructed such that a depth ?s1 from the surfaces of leading and trailing pads, which come into contact with a medium surface when the disk is at rest, to stepped surfaces formed on the air inflow side of the leading pads, a depth ?s2 from the contact surfaces to stepped surfaces formed on the air inflow side of the trailing pad and a step depth ?s3 from the contact surfaces to the surfaces of side rails are in a relation of ?s1??s2??s3. With this arrangement, the slider can follow the waved medium surface at a low flying height with a small flying height fluctuation, thus realizing high density recording, high reliability and reduced cost of the magnetic disk unit.Type: GrantFiled: March 12, 2003Date of Patent: May 2, 2006Assignee: Hitachi Golbal Storage Technologies Japan, Ltd.Inventors: Ryuji Tsuchiyama, Hidekazu Kohira, Masaaki Matsumoto, Kiyoshi Hashimoto, Junguo Xu
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Publication number: 20060039077Abstract: A magnetic head slider including: a head element which records or reproduces information on a magnetic disk, a slider having said head element, and an electric conducting film in which paired first and second parts are formed to be substantially parallel, where current flows within said first and second parts are in the opposite direction as against said slider.Type: ApplicationFiled: October 25, 2005Publication date: February 23, 2006Inventors: Junguo Xu, Ryuji Tsuchiyama, Mikio Tokuyama, Masaaki Matsumoto
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Patent number: 6985334Abstract: A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first positive pressure generating portion provided at an air-inflow side and a positive pressure generating portion surface provided at an air-outflow side. Projections are provided at the air-inflow side respect to the first positive pressure generating portion on a surface which faces the magnetic disk upon read/write operation of the magnetic head slider.Type: GrantFiled: July 15, 2003Date of Patent: January 10, 2006Assignee: Hitachi, Ltd.Inventors: Mikio Tokuyama, Mieko Ishii, Ryuji Tsuchiyama, Youichi Kawakubo, Hiromitsu Tokisue
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Patent number: 6963464Abstract: An object of the present invention is to prevent a spacing between a magnetic head and a writing medium at low temperature from increasing to cause a writing/reading error, and to prevent the magnetic head element protruded by a temperature increase from colliding with small protrusions on a magnetic disk surface, and to prevent damage on the element, and to prevent the occurrence of thermal asperity. In order to attain the object, a magnetic head slider is provided, which includes a magnetic head element supported on a rotating magnetic disk via a gap to write or read information on the magnetic disk, and a heat source for heating the magnetic head element. A magnetic disk device is further provided, which includes a magnetic head slider.Type: GrantFiled: October 25, 2001Date of Patent: November 8, 2005Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Junguo Xu, Ryuji Tsuchiyama, Mikio Tokuyama, Masaaki Matsumoto
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Publication number: 20050243470Abstract: A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first positive pressure generating portion provided at an air-inflow side and a positive pressure generating portion surface provided at an air-outflow side, projections being provided at the air-inflow side at positions with respect to the first positive pressure generating portion on a first surface which faces the magnetic disk upon read/write operation of the magnetic head slider, and a step surface provided at the air-inflow side with respect to said first positive pressure generating portion.Type: ApplicationFiled: June 16, 2005Publication date: November 3, 2005Inventors: Mikio Tokuyama, Mieko Ishii, Ryuji Tsuchiyama, Youichi Kawakubo, Hiromitsu Tokisue
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Patent number: 6961201Abstract: A magnetic disk apparatus includes a low-rotation mode for decreasing the revolution number of a disk, in the low-rotation mode, any control signal for decelerating the disk is not generated to permit it to be decelerated owing to inertial drive and when a detected speed falls below a target speed, the disk is accelerated to thereby realize power saving.Type: GrantFiled: April 30, 2003Date of Patent: November 1, 2005Assignee: Hitachi Ltd.Inventors: Masaki Odai, Kyo Akagi, Ryuji Tsuchiyama
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Patent number: 6785095Abstract: A magnetic disc apparatus includes a magnetic disc, a slider incorporating lifting rails or lifting pads, a magnetic head provided to a lifting rail or a lifting pad on the outflow end side, a suspension supporting the slider, and a carriage attached to the suspension. The slider has an inverted stepped wall formed in a shape such that it is caved in a direction from the inflow end to the outflow end of the slider, and a bleed surface formed at the outflow end side of the inverted stepped wall and caved from the lifting rails or the lifting pads. An action point of an equivalent load is located offset from the inverted stepped wall of the slider toward the inflow end of the slider.Type: GrantFiled: August 20, 2002Date of Patent: August 31, 2004Assignee: Hitachi, Ltd.Inventors: Hiromitsu Tokisue, Ryuji Tsuchiyama, Masaaki Matsumoto, Yoshihiko Miyake, Kiyoshi Hashimoto
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Publication number: 20040150914Abstract: A magnetic head slider in which a leading pad is projected in a thicknesswise direction of the slider, in comparison with a trailing pad so as to reduce vibration caused by contact between a flat medium surface of a disc and the slider carrying thereon a magnetic head, to reduce variation in flying height caused by wavy unevenness of the medium surface, and to reduce variation in atmospheric pressure around the slider, thereby it is possible to enhance the recording density and the reliability of the magnetic head slider while reducing the costs thereof. Further, a magnetic disc unit using the above-mentioned magnetic head slider.Type: ApplicationFiled: June 25, 2003Publication date: August 5, 2004Inventors: Ryuji Tsuchiyama, Hiroshi Tani, Mikio Tokuyama, Hidekazu Kohira, Masayuki Kurita, Mitsuhiro Shoda, Junguo Xu, Masaaki Matsumoto
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Publication number: 20040057150Abstract: A magnetic disk apparatus includes a low-rotation mode for decreasing the revolution number of a disk, in the low-rotation mode, any control signal for decelerating the disk is not generated to permit it to be decelerated owing to inertial drive and when a detected speed falls below a target speed, the disk is accelerated to thereby realize power saving.Type: ApplicationFiled: April 30, 2003Publication date: March 25, 2004Applicant: HITACHI, LTD.Inventors: Masaki Odai, Kyo Akagi, Ryuji Tsuchiyama