Patents by Inventor Kenkichi Inada
Kenkichi Inada 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: 7092187Abstract: The present invention provides a magnetic recording and reproducing apparatus, a magnetic recording and reproducing method, and a thin film magnetic head that enable a good contact between elements and a recording medium with a reduced track pitch even if the number of head channels is increased, thereby realizing high recording density and high transfer rate. At least one multitrack write head having N (N is an integer of 2 or more) write elements arranged along a track width direction in an integral fashion and at least one multitrack read head having L (L is an integer equal to or more than N) read elements arranged along the track width direction in an integral fashion are formed on the rotary drum. The multitrack write head writes signals to a group of N tracks aligned parallel on the magnetic tape during one rotation of the rotary drum, and the multitrack read head reads the group of N signal tracks by the use of any one of the L read elements.Type: GrantFiled: August 5, 2003Date of Patent: August 15, 2006Assignee: Hitachi, Ltd.Inventors: Toshio Tsuchiya, Kenkichi Inada, Akihisa Obata
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Patent number: 6757123Abstract: According to the invention, techniques for cleaning a rotary magneto-resistive head. Embodiments according to the invention are especially useful in tape drive systems, and the like. Embodiments can provide methods and apparatus for cleaning contaminant from rotary magneto-resistive heads while guarding against damage to the head from excess cleaning, and the like. Specific embodiments can control the rotational speed of a rotary magneto-resistive head in order to facilitate cleaning operations. Embodiments include a cleaning device and a control method, and are suited for use in a magneto-resistive head mounted on a rotary cylinder of a computer tape storage unit, for example, although application of the present invention is not limited to such embodiments.Type: GrantFiled: January 16, 2002Date of Patent: June 29, 2004Assignee: Exabyte CorporationInventors: Kenmei Masuda, Hidekazu Takeda, Shigeru Yamazaki, Akihisa Obata, Toshio Tsuchiya, Kenkichi Inada, Kuniako Hirayama
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Publication number: 20040080855Abstract: The present invention provides a magnetic recording and reproducing apparatus, a magnetic recording and reproducing method, and a thin film magnetic head that enable a good contact between elements and a recording medium with a reduced track pitch even if the number of head channels is increased, thereby realizing high recording density and high transfer rate.Type: ApplicationFiled: August 5, 2003Publication date: April 29, 2004Inventors: Toshio Tsuchiya, Kenkichi Inada, Akihisa Obata
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Patent number: 6654194Abstract: According to the invention, techniques for cleaning a rotary magneto-resistive head. Embodiments according to the invention are especially useful in tape drive systems, and the like. Embodiments can provide methods and apparatus for cleaning contaminant from rotary magneto-resistive heads while guarding against damage to the head from excess cleaning, and the like. Specific embodiments can control the rotational speed of a rotary magneto-resistive head in order to facilitate cleaning operations. Embodiments include a cleaning device and a control method, and are suited for use in a magneto-resistive head mounted on a rotary cylinder of a computer tape storage unit, for example, although application of the present invention is not limited to such embodiments.Type: GrantFiled: August 4, 2000Date of Patent: November 25, 2003Assignee: Hitachi, Ltd.Inventors: Kenmei Masuda, Hidekazu Takeda, Shigeru Yamazaki, Akihisa Obata, Toshio Tsuchiya, Kenkichi Inada, Kuniako Hirayama
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Publication number: 20030158030Abstract: Provided are a glass such as a sealing glass which contains a rare earth element and crystalline particles, a structure made by sealing with said sealing glass, a magnetic head made by bonding using said sealing glass, and a magnetic recording and reproducing apparatus on which said magnetic heads are mounted. According to the glass of the present invention, magnetic heads, and other structures can be bonded at low temperatures and a high bond strength can be attained, and thus, magnetic heads having high-speed sliding properties and magnetic recording and reproducing apparatuses of high reliability can be obtained. The glass can be also used for heat resistant parts such as a pannel glass for a cathode-ray tube and the like.Type: ApplicationFiled: November 1, 2002Publication date: August 21, 2003Applicant: HITACHI, LTD.Inventors: Hiroki Yamamoto, Takashi Naito, Takashi Namekawa, Ken Takahashi, Noriyuki Kumasaka, Kenkichi Inada
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Patent number: 6512655Abstract: Provided are a glass such as a sealing glass which contains a rare earth element and crystalline particles, a structure made by sealing with said sealing glass, a magnetic head made by bonding using said sealing glass, and a magnetic recording and reproducing apparatus on which said magnetic heads are mounted. According to the glass of the present invention, magnetic heads, and other structures can be bonded at low temperatures and a high bond strength can be attained, and thus, magnetic heads having high-speed sliding properties and magnetic recording and reproducing apparatuses of high reliability can be obtained. The glass can be also used for heat resistant parts such as a pannel glass for a cathode-ray tube and the like.Type: GrantFiled: July 26, 2000Date of Patent: January 28, 2003Assignee: Hitachi, Ltd.Inventors: Hiroki Yamamoto, Takashi Naito, Takashi Namekawa, Ken Takahashi, Noriyuki Kumasaka, Kenkichi Inada
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Patent number: 6503858Abstract: Provided are a glass such as a sealing glass which contains a rare earth element and crystalline particles, a structure made by sealing with said sealing glass, a magnetic head made by bonding using said sealing glass, and a magnetic recording and reproducing apparatus on which said magnetic heads are mounted. According to the glass of the present invention, magnetic heads, and other structures can be bonded at low temperatures and a high bond strength can be attained, and thus, magnetic heads having high-speed sliding properties and magnetic recording and reproducing apparatuses of high reliability can be obtained. The glass can be also used for heat resistant parts such as a pannel glass for a cathode-ray tube and the like.Type: GrantFiled: July 26, 2000Date of Patent: January 7, 2003Assignee: Hitachi, Ltd.Inventors: Hiroki Yamamoto, Takashi Naito, Takashi Namekawa, Ken Takahashi, Noriyuki Kumasaka, Kenkichi Inada
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Publication number: 20020085302Abstract: According to the invention, techniques for cleaning a rotary magneto-resistive head. Embodiments according to the invention are especially useful in tape drive systems, and the like. Embodiments can provide methods and apparatus for cleaning contaminant from rotary magneto-resistive heads while guarding against damage to the head from excess cleaning, and the like. Specific embodiments can control the rotational speed of a rotary magneto-resistive head in order to facilitate cleaning operations. Embodiments include a cleaning device and a control method, and are suited for use in a magneto-resistive head mounted on a rotary cylinder of a computer tape storage unit, for example, although application of the present invention is not limited to such embodiments.Type: ApplicationFiled: January 16, 2002Publication date: July 4, 2002Inventors: Kenmei Masuda, Hidekazu Takeda, Shigeru Yamazaki, Akihisa Obata, Toshio Tsuchiya, Kenkichi Inada, Kuniako Hirayama
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Patent number: 6150027Abstract: Provided are a glass such as a sealing glass which contains a rare earth element and crystalline particles, a structure made by sealing with said sealing glass, a magnetic head made by bonding using said sealing glass, and a magnetic recording and reproducing apparatus on which said magnetic heads are mounted. According to the glass of the present invention, magnetic heads, and other structures can be bonded at low temperatures and a high bond strength can be attained, and thus, magnetic heads having high-speed sliding properties and magnetic recording and reproducing apparatuses of high reliability can be obtained. The glass can be also used for heat resistant parts such as a pannel glass for a cathode-ray tube and the like.Type: GrantFiled: June 12, 1996Date of Patent: November 21, 2000Assignee: Hitachi, LTDInventors: Hiroki Yamamoto, Takashi Naito, Takashi Namekawa, Ken Takahashi, Noriyuki Kumasaka, Kenkichi Inada
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Patent number: 6108165Abstract: An arrangement is designed to achieve satisfactory tape contact by setting a specific ratio for the width of a drum window and the head length of a double azimuth head. The head length L is defined as the distance from the front end of the preceding head to the back end of the succeeding head. When the drum window width W is defined as the distance of the drum window in the rotary direction, the preceding head and the succeeding head are arranged within the drum window to satisfy the relation 1.15 L.ltoreq.W.ltoreq.1.28 L. When the space S1 is defined as the distance from the front end of the preceding head to the front end of the drum window, and the space S2 is defined as the distance from the back end of the succeeding head to the back end of the drum window, the preceding head and the succeeding head are arranged within the drum window to satisfy the relation 0.075 L.ltoreq.S1.ltoreq.0.14 L and 0.075 L.ltoreq.S2.ltoreq.0.14 L.Type: GrantFiled: November 25, 1998Date of Patent: August 22, 2000Assignee: Hitachi, Ltd.Inventors: Hideki Maruyama, Kenmei Masuda, Kuniaki Hirayama, Yoshio Uemura, Toshihiko Imachi, Kenkichi Inada, Toshio Tsuchiya
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Patent number: 5519555Abstract: A magnetic head for use in a magnetic recording and reproducing system, which head is excellent in magnetic properties, resistance to abrasion, durability and mass-producibility, comprises a pair of magnetic cores each having a substrate and a magnetic alloy film formed on the substrate, the cores being disposed in a manner such that the magnetic alloy films are opposed to and slightly spaced apart from each other, and glass bondings disposed between the magnetic alloy films to integrate the pair of magnetic cores, and a process for producing the same, and a magnetic recording and reproducing system using the magnetic head.Type: GrantFiled: August 3, 1994Date of Patent: May 21, 1996Assignee: Hitachi, Ltd.Inventors: Takashi Naitoh, Takashi Namekawa, Seiichi Yamada, Kunihiro Maeda, Kenkichi Inada
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Patent number: 5157569Abstract: A magnetic head having a pair of nonmagnetic core base bodies coupled to each other in such a manner that amorphous magnetic alloy films are applied to their abutment surfaces and a gap layer is interposed in a magnetic gap of the head, the films applied to the bodies being made abut against each other at their end edge surfaces each of which has a width larger than its film thickness, and at least one of the bodies having a coil winding groove formed at a portion at which the bodies are coupled to each other.Type: GrantFiled: May 22, 1991Date of Patent: October 20, 1992Assignee: Hitachi, Ltd.Inventors: Noriyuki Kumasaka, Kenkichi Inada, Ikuo Shinta, Sigeo Imai, Souzou Sasajima
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Patent number: 5047885Abstract: Disclosed is a magnetic head formed of a thin metal film in which a metal magnetic film in the form of a chevron is formed on a substrate, and two half cores in each of which the apex portion of the chevron-shaped metal magnetic film is flattened are integrated in such a manner as to face each other with a gap member placed therebetween, the magnetic head comprising a desired track width not more twice thicknesses d.sub.1, d.sub.2 of the metal magnetic film on both sides of the apex portion, and the following formula is met:0.74.ltoreq.d.sub.2 /d.sub.1 .ltoreq.1.35.Type: GrantFiled: November 10, 1988Date of Patent: September 10, 1991Assignee: Hitachi, Ltd.Inventors: Hideo Zama, Hitoshi Idegami, Yosio Manabe, Kenkichi Inada