Patents by Inventor Yoichiro Tanaka

Yoichiro Tanaka 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).

  • Patent number: 5815342
    Abstract: Disclosed is a perpendicular magnetic recording/reproducing apparatus comprising perpendicular magnetic recording media and magnetic heads. Each perpendicular magnetic recording medium has a substrate, a soft magnetic back layer and a magnetic recording layer with a perpendicular magnetic anisotropy both formed on the substrate. Each magnetic head has at least one magnetic field generating element capable of applying a magnetic field to a given region of the soft magnetic back layer at a time of signal reproduction, for performing recording and reproducing of magnetized signals with respect to the associated perpendicular magnetic recording media, whereby Barkhausen noise is reduced. The perpendicular magnetic recording medium may further include a bias-field applying layer formed on at least a substrate side surface of the soft magnetic back layer. Each perpendicular magnetic recording medium may further have the bias-field applying layer formed between the substrate and the high-permeability magnetic layer.
    Type: Grant
    Filed: November 13, 1995
    Date of Patent: September 29, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Junichi Akiyama, Yoichiro Tanaka
  • Patent number: 5812337
    Abstract: A magnetic disk drive capable of performing a head seek at high speed even when a track pitch of the recording track of the magnetic disk is narrowed. The structure eliminates incomplete erasure caused by a positioning error of a recording head and prevents side-fringe magnetic field from erasing a signal on an adjacent track in order to obtain a larger reproduction output.
    Type: Grant
    Filed: September 28, 1995
    Date of Patent: September 22, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoichiro Tanaka, Yuji Kubota, Norio Nakamura
  • Patent number: 5808973
    Abstract: A magnetic recording and optical readout apparatus and method, wherein a recording and readout head member records and reproduces a signal while moving relatively to a magnetic recording medium. The head member has a magnetic recording head and a readout head in a body. The head member is supported by a suspension so as to contact the medium or to keep a slight distance from the medium by a lifting-up force being generated by air flow, while moving relatively to the medium. A laser beam is radiated from a laser emitting element through a light transmitting hole formed in a light intercepting layer, whose diameter is smaller than the laser beam wavelength of the laser emitting element. By radiating the laser beam through the hole, localized near field electromagnetic waves are generated and reflected at the medium. The reflected electromagnetic waves bear changes of a polarization angle corresponding to the recorded information, which are detected by the readout head to reproduce the signal.
    Type: Grant
    Filed: September 6, 1996
    Date of Patent: September 15, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoichiro Tanaka
  • Patent number: 5792564
    Abstract: A longitudinal recording medium and a magnetic recording apparatus containing the same, comprising a substrate and a longitudinal magnetization film formed on the substrate containing grains of a Co-based alloy, and exhibiting an oxygen concentration distribution having two peaks as follows: a peak of higher oxygen concentration pertaining to grain boundaries of the longitudinal magnetization film, and a peak of lower oxygen concentration pertaining to grain interiors of the longitudinal magnetization film.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: August 11, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takashi Hikosaka, Yoichiro Tanaka, Junichi Akiyama
  • Patent number: 5688358
    Abstract: A pedestal for supporting a semiconductor substrate in an R.F. plasma reactor chamber includes a conductive disk platen having a diameter exceeding the diameter of the substrate so that an outer annular portion of the conductive disk platen provides a direct path of R.F. power from the plasma while a remaining inner portion of the conductive disk provides a path of R.F.
    Type: Grant
    Filed: March 8, 1995
    Date of Patent: November 18, 1997
    Assignee: Applied Materials, Inc.
    Inventors: Yoichiro Tanaka, Megumi Taoka, Barney Cohen
  • Patent number: 5680283
    Abstract: A ratio tW/pL of a track width tW to a width pL of an end face, in a traveling direction, of a main pole which performs recording or reproduction on or from the magnetic recording layer of a medium, and a saturation magnetic flux density Bs. (T: tesla) of a magnetic material constituting the main pole satisfy:(A.sub.1 .times.Bs+B.sub.1).sup.2 +C.sub.1 .ltoreq.tW/pL.ltoreq.(A.sub.2 .times.Bs+B.sub.2).sup.2 +C.sub.2for A.sub.1 =4.3.times..delta.+0.4, B.sub.1 =-16.2.times..delta.-0.3, C.sub.1 =2.2.times..delta.+0.3, A.sub.2 =378.times..delta..sup.2 -66.times..delta.+4.2, B.sub.2 =264.times..delta..sup.2 -43.times..delta.+2.1, and C.sub.2 =9.times..delta.-2.5 where .delta. (.mu.m) is a distance from the end face of the main pole to the soft magnetic under layer.
    Type: Grant
    Filed: September 6, 1995
    Date of Patent: October 21, 1997
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tsutomu Tanaka, Tomoko Taguchi, Yoichiro Tanaka
  • Patent number: 5665292
    Abstract: A solid o/w-type cosmetic composition, a process for molding it, and a container used for aqueous-type solid cosmetics. The cosmetic composition comprises (a) a water-soluble solidifying agent selected from agar and gelatin, (b) an oil component and (c) water, and optionally, (d) a powder or (e) a water-soluble adhesive. The composition has superior characteristics inherent in an o/w-type cosmetic, while providing excellent usability and portability. The molding process comprises applying a water-carrying sheet material to the surface of the composition before solidification and releasing it after solidification. The container for an aqueous-type solid cosmetic composition is characterized by having a water-absorbing material secured to a receptacle of the container.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: September 9, 1997
    Assignee: Kose Corporation
    Inventors: Yoichiro Tanaka, Kazuo Suzuki
  • Patent number: 5645903
    Abstract: A solid o/w-type cosmetic composition, a process for molding it, and a container used for aqueous-type solid cosmetics are disclosed. The cosmetic composition comprises (a) a water-soluble solidifying agent selected from agar and gelatin, (b) an oil component and (c) water, and optionally, (d) a powder or (e) a water-soluble adhesive. The composition has superior characteristics inherent in an o/w-type cosmetic, while providing excellent usability and portability. The molding process comprises applying a water-carrying sheet material to the surface of the composition before solidification and releasing it after solidification. The container for an aqueous-type solid cosmetic composition is characterized by having a water-absorbing material secured to a receptacle of the container.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: July 8, 1997
    Assignee: Kose Corporation
    Inventors: Yoichiro Tanaka, Kazuo Suzuki
  • Patent number: 5540921
    Abstract: A solid o/w-type cosmetic composition, a process for molding it, and a container used for aqueous-type solid cosmetics are disclosed. The cosmetic composition comprises (a) a water-soluble solidifying agent selected from agar and gelatin, (b) an oil component and (c) water, and optionally, (d) a powder or (e) a water-soluble adhesive. The composition has superior characteristics inherent in an o/w-type cosmetic, while providing excellent usability and portability. The molding process comprises applying a water-carrying sheet material to the surface of the composition before solidification and releasing it after solidification. The container for an aqueous-type solid cosmetic composition is characterized by having a water-absorbing material secured to a receptacle of the container.
    Type: Grant
    Filed: December 22, 1993
    Date of Patent: July 30, 1996
    Assignee: KOSE Corporation
    Inventor: Yoichiro Tanaka
  • Patent number: 5510690
    Abstract: A Li ion battery main body and a charge/discharge circuit for controlling charge/discharge of the Li ion battery main body in accordance with a difference between an NiH battery and an Li ion battery are arranged in a battery pack housing having the same shape, mounting mechanism, and connection terminals as those of a standard battery pack using the NiH battery. The battery pack also includes a discrimination terminal for discriminating the type of battery.
    Type: Grant
    Filed: August 31, 1993
    Date of Patent: April 23, 1996
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoichiro Tanaka, Hiroyuki Tsuji
  • Patent number: 5486967
    Abstract: According to the present invention, there is provided a magnetic disk memory system.
    Type: Grant
    Filed: March 14, 1994
    Date of Patent: January 23, 1996
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoichiro Tanaka, Kazushi Tanimoto, Hiroshi Ohashi, Takashi Hikosaka, Yasuo Ohtsubo, Shigeru Hoshina
  • Patent number: 5227767
    Abstract: An instrument arrangement for an automotive vehicle comprises front and rear housings, and an indicating portion arranged therebetween and having on surface on which luminophors are placed. Within the front housing are arranged a visible light source, and a black light source. The black light source is arranged to be more distant from the one surface of the indicating portion than the visible light source, thus reflecting light of the visible light source toward the indicating portion.
    Type: Grant
    Filed: August 20, 1992
    Date of Patent: July 13, 1993
    Assignee: Nissan Motor Co., Ltd.
    Inventor: Yoichiro Tanaka
  • Patent number: 5189574
    Abstract: A magnetic or optical disk apparatus having a flexible disk rotated at high speed and head sliders for reading and writing information on the disk, floating from both sides of the disk. The disk apparatus is also provided with straightening plates for keeping air flow in the radial direction of the disk as a laminar flow to surely prevent the disk from being vibrated at the time when the disk is rotated at high speed. As the result, positions of the head sliders relative to the disk can be surely and accurately maintained to provide heads with excellent recording and reproducing characteristics. Mass storage and high speed access can be thus achieved without damaging the flexible disk and the disk apparatus can be smaller-sized with lighter weight and lower cost.
    Type: Grant
    Filed: November 3, 1989
    Date of Patent: February 23, 1993
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Makoto Imamura, Kazushi Tanimoto, Yoichiro Tanaka, Yoshiaki Sonobe, Katsuyoshi Kitagawa
  • Patent number: 4982390
    Abstract: A signal recording apparatus includes a temporary memory for writing an input signal at a predetermined signal-transfer rate and reading it out in the same sequence as input, and a main recorder for recording the signal read out from the temporary memory. The reading signal-transfer rate of the temporary memory is variable. The apparatus further includes a controller which, upon receiving a data-save instruction, sets the reading signal transfer rate of the temporary memory faster than its writing signal transer rate and transfers the signal from this memory to the main recorder.
    Type: Grant
    Filed: October 18, 1988
    Date of Patent: January 1, 1991
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoichiro Tanaka
  • Patent number: 4953095
    Abstract: An apparatus for measuring the frequency of a pulse train signal and method therefor applicable to a speedometer of a vehicle are disclosed in which a count value C of at least one counter which counts number of pulses in the pulse train signal for predetermined counting intervals of time .DELTA.T (=T/n, wherein T denotes a frequency measuring time interval and n denotes a calculation constant) is updated to a value related to the count value for each predetermined counting interval of time .DELTA.T and stored and outputted for each predetermined counting interval of time .DELTA.T so that the same or better performance as that using a stagger ring method can be achieved. The value is expressed by (C-C/.alpha.) in a first preferred embodiment (wherein .alpha. denotes the calculation constant preferably equal to n), by (C-C.times.m/.alpha.+D) in a second preferred embodiment (wherein m denotes the number of counters and D denotes the latest count values of the m counters during .DELTA.
    Type: Grant
    Filed: September 30, 1987
    Date of Patent: August 28, 1990
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Masahiro Ishikawa, Norio Fujiki, Yukio Hiramoto, Yoichiro Tanaka
  • Patent number: 4871993
    Abstract: To prevent the driver from being confused by the fact that a pseudo vehicle speed to diagnose a vehicle speed meter is indicated when a vehicle speed sensor is disconnected by an accident during vehicle travelling, a pseudo vehicle speed sensor signal is applied to the vehicle speed meter only when the vehicle speed sensor is disconnected from the vehicle speed meter and the disconnected sensor is reconnected to the meter a predetermined time period after the sensor has been disconnected from the meter. The self-diagnostic apparatus is composed of counters, flip-flops and logical gates, and is reset whenever an ignition switch is turned on.
    Type: Grant
    Filed: July 1, 1988
    Date of Patent: October 3, 1989
    Assignees: Kanto Seiki Co., Ltd., Nissan Motor Co., Ltd.
    Inventors: Takatoshi Hayashi, Norio Fujiki, Yoichiro Tanaka, Takashi Nishimoto, Masakazu Kobayashi
  • Patent number: 4761334
    Abstract: A magnetic recording medium in which a silicon nitride film is formed on a magnetic recording layer having an axis of easy magnetization in the direction essentially perpendicular to its own layer surface. The magnetic recording layer is a metallic magnetic film such as a Co-Cr containing alloy. The silicon nitride film is preferably in a state in which the number of nitrogen atoms is less than four thirds of the number of silicon atoms. A lubricant layer such as a layer of fluorocarbon can be formed on the silicon nitride film.
    Type: Grant
    Filed: July 1, 1985
    Date of Patent: August 2, 1988
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masayuki Sagoi, Noritsugu Kawashima, Yoichiro Tanaka, Kunio Sekine
  • Patent number: 4748073
    Abstract: A perpendicular magnetic floppy disk has a base layer on each side of which a recording layer is formed having an axis of easy magnetization in a direction perpendicular to its surface. A multilayered protective layer structure is provided on the recording layer. The protective layer structure includes double-stacked non-magnetic thin-film layer structures made of an Si-N-O-based film and silicon oxide film, respectively. The total thickness of the multilayered protective layer structure is smaller than 40 nanometers, which is thin enough to maximize an efficiency in perpendicular magnetic recording of data signal.
    Type: Grant
    Filed: June 26, 1986
    Date of Patent: May 31, 1988
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masayuki Sagoi, Yoichiro Tanaka
  • Patent number: 4701374
    Abstract: A magnetic recording medium obtained by forming a Si-N-O system film on a magnetic recording layer with perpendicular axis of easy magnetization. The magnetic recording layer is a metallic magnetic film such as Co-Cr system alloy film. The oxygen content in the Si-N-O system film is selected preferably to show a maximum absorption of infrared radiation in the range above 830 cm.sup.-1 and below 1100 cm.sup.-1 of 1/.lambda. (.lambda. is the wavelength of the infrared radiation). Through formation of the Si-N-O system film, the magnetic recording medium can satisfy simultaneously both of the durability and the perpendicular magnetic recording characteristics.
    Type: Grant
    Filed: July 1, 1985
    Date of Patent: October 20, 1987
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masayuki Sagoi, Yoichiro Tanaka, Hiroki Nakamura
  • Patent number: RE35670
    Abstract: A magnetic or optical disk apparatus having a flexible disk rotated at high speed and head sliders for reading and writing information on the disk, floating from both sides of the disk. The disk apparatus is also provided with straightening plates for keeping air flow in the radial direction of the disk as a laminar flow to surely prevent the disk from being vibrated at the time when the disk is rotated at high speed. As the result, positions of the head sliders relative to the disk can be surely and accurately maintained to provide heads with excellent recording and reproducing characteristics. Mass storage and high speed access can be thus achieved without damaging the flexible disk and the disk apparatus can be smaller-sized with lighter weight and lower cost.
    Type: Grant
    Filed: April 20, 1994
    Date of Patent: November 25, 1997
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Makoto Imamura, Kazushi Tanimoto, Yoichiro Tanaka, Yoshiaki Sonobe, Katsuyoshi Kitagawa