Patents by Inventor Hidekazu Kohira
Hidekazu Kohira 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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Publication number: 20030193750Abstract: A magnetic head slider having a plurality of surfaces which are formed sequentially from an adjacent side to a magnetic disk, and a slider rail surface, which is arranged near an air flow-out edge on a nearest surface of the plurality of surfaces including a long sideways rail surface on an air flow-in side and a lengthwise rail surface on an air flow-out side, has a magnetic head. An area of the long sideways rail surface is larger than an area of the lengthwise rail surface.Type: ApplicationFiled: April 23, 2003Publication date: October 16, 2003Inventors: Hidekazu Kohira, Masaaki Matsumoto, Hideaki Tanaka, Teruyoshi Higashiya, Kiyoshi Hashimoto, Akira Matsuda, Takanori Yamazaki
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Patent number: 6628480Abstract: A magnetic head slider for sliding on a magnetic disk includes a leading edge, a trailing edge, an air bearing surface having a front step bearing of submicron depth made from the leading edge, and a rail surface made from the front step bearing. A negative pressure recess which is more profound than the front step bearing is made from the rail surface, and a side step bearing having a depth identical with the front step bearing is made from the rail surface. The ratio of the depth R of the recess to the depth &dgr;S of the front step bearing is R/&dgr;s>5.Type: GrantFiled: August 3, 1999Date of Patent: September 30, 2003Assignee: Hitachi, Ltd.Inventors: Hidekazu Kohira, Masaaki Matsumoto, Kiyoshi Hashimoto, Masayoshi Endo, Akio Takakura, Yoshinori Takeuchi, Shinsuke Higuchi, Akira Iida
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Publication number: 20030133227Abstract: A magnetic disk device, which is provided with a magnetic head slider mounted with a magnetic head and a magnetic disk, and of which the magnetic head slider has the possibility of contacting the magnetic disk at the vicinity of the magnetic head,Type: ApplicationFiled: December 30, 2002Publication date: July 17, 2003Inventors: Hidetoshi Anan, Tetsuya Matsusaki, Hidekazu Kohira, Yoshihiro Shiroishi, Masaaki Matsumoto, Hideaki Tanaka, Teruyoshi Higashiya, Kiyoshi Hashimoto, Akira Matsuda, Takanori Yamazaki
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Patent number: 6556381Abstract: A magnetic disk device is provided with a magnetic head slider mounted with a magnetic head and a magnetic disk, and the magnetic head slider has the possibility of contacting the magnetic disk at the vicinity of the magnetic head during operation of the magnetic disk device. The magnetic head slider is 1.25 mm or less in length, 1 mm or less in width and 0.3 mm or less in thickness, and the friction force exerted between the magnetic head slider and the magnetic disk is 10 mN or less. The magnetic head comprises four substantially parallel surfaces, and the depth from a first surface, which is the most adjacent surface to the magnetic disk, to a second surface is 10 nm to 50 nm, the depth from the second surface to a third surface is 50 nm to 200 nm, and the depth from the third surface to a fourth surface is 400 nm to 1 &mgr;m.Type: GrantFiled: January 18, 2001Date of Patent: April 29, 2003Assignee: Hitachi, Ltd.Inventors: Hidekazu Kohira, Masaaki Matsumoto, Hideaki Tanaka, Teruyoshi Higashiya, Kiyoshi Hashimoto, Akira Matsuda, Takanori Yamazaki
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Publication number: 20030021059Abstract: A magnetic disk unit includes a magnetic disk attached to a spindle so as to be rotatable, a slider having a magnetic head for reading/writing data onto/from the magnetic disk, a suspension for providing the slider with a predetermined load, and an actuator arm for positioning the slider attached to the suspension on the magnetic disk. A first pad including the magnetic head and second pads including no magnetic heads are disposed on an air bearing surface of.the slider. During rotation of said magnetic disk, a part of the first pad keeps in contact with the magnetic disk. A load point of the suspension with respect to the slider is positioned between a leading edge of the slider and a position located at a distance equivalent to substantially 0.42 times a whole length of the slider from the leading edge of the slider.Type: ApplicationFiled: September 18, 2002Publication date: January 30, 2003Applicant: HITACHI, LTD.Inventors: Hidekazu Kohira, Hiromitsu Tokisue, Masaaki Matsumoto, Masayuki Suzuki, Yoshinori Takeuchi, Toshihiko Shimizu
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Publication number: 20020191341Abstract: A magnetic head slider has a magnetic head mounting surface holding a magnetic head, to be kept closest to a magnetic disk when the magnetic head slider is in operation, a slider rail surface contiguous with a surface, on the side of an air inlet end, and opposite sides of a portion, near an air outlet end, of the magnetic head and extending near to the air outlet end, a step bearing surface formed at least on the side of the air inlet end of the slider rail surface, and a negative-pressure groove formed so as to surround the step bearing surface. The magnetic head mounting surface is typically formed on an alumina protective film protecting the magnetic head. The variation of the flying height of the magnetic head slider with respect to a rolling direction is reduced and a proximity ability to approach the magnetic disk is improved.Type: ApplicationFiled: July 19, 2002Publication date: December 19, 2002Applicant: HITACHI, LTD.Inventors: Hidekazu Kohira, Masaaki Matsumoto, Hideaki Tanaka, Akira Matsuda, Shozo Saegusa
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Patent number: 6493179Abstract: A magnetic disk unit includes a magnetic disk, a slider having a magnetic head, a suspension for providing the slider, and an actuator arm for positioning the slider on the magnetic disk a first pad including the magnetic head and second pads including no magnetic heads are disposed on an air bearing surface of the slider. A load point of the suspension with respect to the slider is positioned between a leading edge of the slider and a position located at a distance equivalent to substantially 0.42 times a whole length of the slider from the leading edge of the slider. When the slider is seek-positioned on a certain track on the magnetic disk, a frictional force exerted between the first pad of the slider and the magnetic disk is smaller than a product of lateral stiffness of the suspension in a seeking direction and a track width.Type: GrantFiled: September 28, 2001Date of Patent: December 10, 2002Assignee: Hitachi, Ltd.Inventors: Hidekazu Kohira, Hiromitsu Tokisue, Masaaki Matsumoto, Masayuki Suzuki, Yoshinori Takeuchi, Toshihiko Shimizu
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Publication number: 20020135941Abstract: A magnetic head slider for sliding on the magnetic disk, which comprises: a leading edge; a trailing edge, wherein the air bearing surface has a front step bearing with submicron depth of the air bearing surface was made from said leading edge in the continuity, a rail surface made from this front step bearing in the continuity, a negative pressure recess which is more profound than said front step bearing made in the continuity from this rail surface and a side step bearing with the depth identical with said front step bearing made in the continuity from the rail surface, whereby the ratio of depth R of said recess and depth &dgr; s of said front step bearing is R/&dgr;s>5.Type: ApplicationFiled: August 3, 1999Publication date: September 26, 2002Inventors: HIDEKAZU KOHIRA, MASAAKI MATSUMOTO, KIYOSHI HASHIMOTO, MASAYOSHI ENDO, AKIO TAKAKURA, YOSHINORI TAKEUCHI, SHINSUKE HIGUCHI, AKIRA IIDA
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Patent number: 6445544Abstract: A magnetic disk unit includes a magnetic disk attached to a spindle so as to be rotatable, a slider having a magnetic head for reading/writing data onto/from the magnetic disk, a suspension for providing the slider with a predetermined load, and an actuator arm for positioning the slider attached to the suspension on the magnetic disk. A first pad including the magnetic head and second pads including no magnetic heads are disposed on an air bearing surface of the slider. During rotation of said magnetic disk, a part of the first pad keeps in contact with the magnetic disk. A load point of the suspension with respect to the slider is positioned between a leading edge of the slider and a position located at a distance equivalent to substantially 0.42 times a whole length of the slider from the leading edge of the slider.Type: GrantFiled: June 12, 2001Date of Patent: September 3, 2002Assignee: Hitachi, Ltd.Inventors: Hidekazu Kohira, Hiromitsu Tokisue, Masaaki Matsumoto, Masayuki Suzuki, Yoshinori Takeuchi, Toshihiko Shimizu
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Publication number: 20020057532Abstract: Employed is a structure for moving by a micro-actuator not a read/write element but an air-bearing surface pad. The air-bearing surface pad is arranged nearer to the leading end than the read/write element. This arrangement allows the read/write element portion to have a sufficient size, making it possible to mount the currently used read/write element and associated wiring structure. The individual adjustment of a flying height leads to the increased recording density. Moving the read/write element away from the disk during loading/unloading operations can enhance reliability.Type: ApplicationFiled: November 14, 2001Publication date: May 16, 2002Inventors: Masayuki Kurita, Masaaki Matsumoto, Junguo Xu, Hidekazu Kohira, Yuuichi Ootani, Hideaki Tanaka, Yoshihiko Miyake, Takeshi Harada
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Publication number: 20020024769Abstract: A magnetic disk unit includes a magnetic disk attached to a spindle so as to be rotatable, a slider having a magnetic head for reading/writing data onto/from the magnetic disk, a suspension for providing the slider with a predetermined load, and an actuator arm for positioning the slider attached to the suspension on the magnetic disk. A first pad including the magnetic head and second pads including no magnetic heads are disposed on an air bearing surface of the slider. During rotation of said magnetic disk, a part of the first pad keeps in contact with the magnetic disk. A load point of the suspension with respect to the slider is positioned between a leading edge of the slider and a position located at a distance equivalent to substantially 0.42 times a whole length of the slider from the leading edge of the slider.Type: ApplicationFiled: September 28, 2001Publication date: February 28, 2002Applicant: HITACHI, LTD.Inventors: Hidekazu Kohira, Hiromitsu Tokisue, Masaaki Matsumoto, Masayuki Suzuki, Yoshinori Takeuchi, Toshihiko Shimizu
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Publication number: 20010048575Abstract: A magnetic disk unit includes a magnetic disk attached to a spindle so as to be rotatable, a slider having a magnetic head for reading/writing data onto/from the magnetic disk, a suspension for providing the slider with a predetermined load, and an actuator arm for positioning the slider attached to the suspension on the magnetic disk. A first pad including the magnetic head and second pads including no magnetic heads are disposed on an air bearing surface of. the slider. During rotation of said magnetic disk, a part of the first pad keeps in contact with the magnetic disk. A load point of the suspension with respect to the slider is positioned between a leading edge of the slider and a position located at a distance equivalent to substantially 0.42 times a whole length of the slider from the leading edge of the slider.Type: ApplicationFiled: June 12, 2001Publication date: December 6, 2001Applicant: HITACHI, LTD.Inventors: Hidekazu Kohira, Hiromitsu Tokisue, Masaaki Matsumoto, Masayuki Suzuki, Yoshinori Takeuchi, Toshihiko Shimizu
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Publication number: 20010030834Abstract: A magnetic disk device, which is provided with a magnetic head slider mounted with a magnetic head and a magnetic disk, and of which the magnetic head slider has the possibility of contacting the magnetic disk at the vicinity of the magnetic head,Type: ApplicationFiled: January 18, 2001Publication date: October 18, 2001Inventors: Hidekazu Kohira, Masaaki Matsumoto, Hideaki Tanaka, Teruyoshi Higashiya, Kiyoshi Hashimoto, Akira Matsuda, Takanori Yamazaki
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Patent number: 6181524Abstract: A magnetic disk apparatus for recording information on and reproducing information from a magnetic disk with a magnetic head. A magnetic head supporting device includes a slider having the magnetic head mounted thereon, a flexible section supporting the slider, and a supporting section connected to the flexible section. The slider, the flexible section, and the supporting section are integrally formed from a same material. A rotary-type or linear-type positioning mechanism positions the magnetic head at a predetermined radial position of the magnetic disk.Type: GrantFiled: September 25, 1995Date of Patent: January 30, 2001Assignee: Hitachi, Ltd.Inventors: Mikio Tokuyama, Kenji Mori, Hidekazu Kohira, Toshihiko Simizu, Hiromu Hirai, Takao Terayama
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Patent number: 6157519Abstract: A magnetic disk unit includes a magnetic disk attached to a spindle so as to be rotatable, a slider having a magnetic head for reading/writing data onto/from the magnetic disk, a suspension for providing the slider with a predetermined load, and an actuator arm for positioning the slider attached to the suspension on the magnetic disk. A first pad including the magnetic head and second pads including no magnetic heads are disposed on an air bearing surface of the slider. During rotation of said magnetic disk, a part of the first pad keeps in contact with the magnetic disk. A load point of the suspension with respect to the slider is positioned between a leading edge of the slider and a position located at a distance equivalent to substantially 0.42 times a whole length of the slider from the leading edge of the slider.Type: GrantFiled: April 4, 1996Date of Patent: December 5, 2000Assignee: Hitachi, Ltd.Inventors: Hidekazu Kohira, Hiromitsu Tokisue, Masaaki Matsumoto, Masayuki Suzuki, Yoshinori Takeuchi, Toshihiko Shimizu
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Patent number: 5973880Abstract: A negative pressure flying head slider includes an air bearing surface of a substantially rectangular shape disposed in opposed relation to a rotating magnetic disk. One side rail of the slider is adapted to be located at an outer periphery-side of the magnetic disk when the slider is mounted on a magnetic disk device, and has an inflow-side side rail portion which is disposed at an air inflow end-side of the slider, extending generally parallel to the longitudinal direction of the slider, and an outflow-side side rail portion which is disposed at an air outflow end-side of the slider, extending in a direction of a yaw angle. The angle of the outflow-side side rail portion with respect to the inflow-side side rail portion is greater than the maximum value of an absolute value of the yaw angle. The slider further includes a recess defined by a cross rail and the side rails, and a slit formed in the cross rail to permit the recess to communicate with the air inflow end of the slider.Type: GrantFiled: November 21, 1997Date of Patent: October 26, 1999Assignee: Hitachi, Ltd.Inventors: Kiyoshi Hashimoto, Masaaki Matsumoto, Hidekazu Kohira, Yasuo Kojima, Shinji Yonemura
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Patent number: 5862017Abstract: In a head suspension, a gimbal spring is constituted by a flexible sheet having an electrical circuit formed on its surface, and a through hole is formed through that portion of a load beam of metal overlapping the gimbal spring. The load beam is bonded integrally to the gimbal spring to form the head suspension. There is also disclosed a rotary disk storage unit incorporating such a head suspension.Type: GrantFiled: October 10, 1997Date of Patent: January 19, 1999Assignee: Hitachi, Ltd.Inventors: Hidekazu Kohira, Mikio Tokuyama, Hiromitsu Tokisue
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Patent number: 5519552Abstract: In a head suspension, a gimbal spring is constituted by a flexible sheet having an electrical circuit formed on its surface, and a through hole is formed through that portion of a metal load beam overlying the gimbal spring. The load beam is bonded integrally to the gimbal spring to form the head suspension. There is also disclosed a rotary disk storage unit incorporating such a head suspension.Type: GrantFiled: July 11, 1994Date of Patent: May 21, 1996Assignee: Hitachi, Ltd.Inventors: Hidekazu Kohira, Mikio Tokuyama, Hiromitsu Tokisue
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Patent number: 5457545Abstract: An object of the present invention is to provide a facsimile apparatus having a high resolution image display unit and a hard copying unit, which is capable of preventing wasteful consumption of recording paper sheets while revealing a reduced size and excellent operation facility.Type: GrantFiled: January 5, 1993Date of Patent: October 10, 1995Assignee: Hitachi, Ltd.Inventors: Hidekazu Kohira, Shunichi Oohara, Michihiro Watanabe, Tatsuya Nagata, Kazuytaka Sato, Shogo Matsumoto
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Patent number: 5430591Abstract: A flying head slider utilizing a negative pressure according to the invention has a front end, a rear end, and an air bearing surface directed to face a rotating recording medium. The air bearing surface includes a pair of side rails extending on both sides of the air bearing surface from the front end in the longitudinal direction of the slider, a center rail provided at the center of the air bearing surface in the transverse direction and extending from the front end to the rear end in the longitudinal direction of the slider, a cross rail extending in the transverse direction of the slider to connect the pair of side rails and the center rail to each other near the front end, a pair of recesses defined by the pair of side rails, the center rail and the cross rail, communicating grooves for communicating the pair of recesses with the front end, and a head mounted on a rear end surface of the center rail. The pair of side rails, the center rail and the cross rail lie substantially in the same plane.Type: GrantFiled: October 13, 1993Date of Patent: July 4, 1995Assignee: Hitachi, Ltd.Inventors: Yoshinori Takeuchi, Kenji Mori, Masaaki Matsumoto, Hiroshi Agari, Jyousei Shimizu, Eisei Togawa, Yasuo Kojima, Mikio Tokuyama, Hiromitsu Tokisue, Hidekazu Kohira, Yokuo Saitoh, Haruhide Takahashi, Yoshihiro Shiorishi