Patents Assigned to Hitachi, Ltd.
  • Publication number: 20020044508
    Abstract: A video signal recording apparatus using an information recording medium, having: a unit for identifying and detecting a WO type information recording medium and a rewritable type information recording medium; a control unit for each of the WO type information recording medium and the rewritable type information recording medium; and a display apparatus for displaying a detection result of the detecting unit. In the video signal recording apparatus using the information recording medium, file management information to form a directory is recorded as intermediate information onto the information recording medium.
    Type: Application
    Filed: December 20, 2001
    Publication date: April 18, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Tamotsu Ito, Tsukasa Hasegawa, Atsushi Saito, Shigemitsu Higuchi
  • Publication number: 20020043953
    Abstract: A synchronous motor control system includes a synchronous motor 1, an inverter 3 and a controller 4 wherein a current differential detecting unit 13 detects a variation of a motor current when the three phases of the motor 1 is short circuited by the inverter 3, namely at the moment when a carrier wave in a PWM signal generator 9 assumes maximum or minimum value, in a calculating unit 14 a phase &ggr; from &agr; axis of a stationary coordinate system to a three phase short circuited current differential vector is calculated, a phase &dgr; is estimated from d axis to the three phase short circuited current differential vector by making use of d axis current id and q axis current iq on d-q axes coordinate system in the controller 4, thereafter the magnetic pole position &thgr; with respect to &agr; axis is calculated from the phases &ggr; and &dgr;, based on thus calculated magnetic pole position &thgr;, d-q axes control units 11, 7 and 8 are constituted to control the synchronous motor, thereby a highly reliab
    Type: Application
    Filed: May 29, 2001
    Publication date: April 18, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Ryoso Masaki, Satoru Kaneko
  • Publication number: 20020043964
    Abstract: A power supply line is wired in a loop from a battery power supply, and a power supply relay circuit is installed intermediately of the power supply line such that power is supplied from the power supply relay circuit to an electric load connected to a terminal unit of an intensive wiring line. By this arrangement, not only wires for control signals but also wires for power supply can be reduced. The terminal unit may serve also as the power supply relay circuit.
    Type: Application
    Filed: April 24, 2001
    Publication date: April 18, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Hiroyuki Saito, Tatsuya Yoshida, Shinichi Sakamoto, Mitsuru Koni, Kiyoshi Horibe
  • Publication number: 20020046178
    Abstract: An apparatus and method of copy protection for use in digital data recorders such as DVD-RAM recorders, which includes embedding transmission time information into a digital data stream by digital watermarking and comparing the transmission time with the current time at the data recorder (30, 50). If the time difference is less than a threshold value it is presumed that the recording is for time-shifting purposes, namely recording a programme to watch later, which is generally allowed by copyright laws. If the time difference is greater than a threshold value it is presumed that the recording is an attempted unauthorised recording such as from a pre-recorded copy, and further recording is prevented.
    Type: Application
    Filed: October 2, 2001
    Publication date: April 18, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Hajime Morito, Hiroshi Yoshiura, Michael Roe
  • Publication number: 20020043922
    Abstract: A display device having a surface treating film formed on the outer surface of a substrate of the display device, said surface treating film having a property of changing light transmittance or refractive index by light or UV rays, and/or containing a compound which can be deposited by irradiation with light, shows excellent antireflective antistatic properties and low surface resistance, and can be applied to flat cathode-ray tubes.
    Type: Application
    Filed: September 28, 2001
    Publication date: April 18, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Tomoji Oishi, Masahiro Nishizawa, Norikazu Uchiyama, Maki Taniguchi, Toshio Tojo
  • Publication number: 20020044323
    Abstract: In a module for optical communication comprising an optical fiber including an axial-end surface, and an optical element including an optical surface facing to the axial-end surface in such a manner that a light is transmitted between the optical surface and the axial-end surface,
    Type: Application
    Filed: December 6, 2001
    Publication date: April 18, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Kimio Tatsuno, Kouji Yoshida, Takeshi Kato, Toshinori Hirataka, Norihiro Yazaki, Shoichi Takahashi, Hiroshi Naka
  • Publication number: 20020046189
    Abstract: The present invention provides a payment method that balances reliability, security, and speed of payments, a system for the same, and a recording medium storing a program for the same. In one embodiment, a financial institution such as a credit company, a bank, or the like determines whether or not a payment request from a buyer is valid using billing information from the merchant involved in the payment and authentication information from the buyer. Then, if the billing information sent from the merchant does not match the ordering information extracted from the authentication information, the payment request is rejected.
    Type: Application
    Filed: July 5, 2001
    Publication date: April 18, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Akira Morita, Hiroyuki Chiba, Takeshi Akutsu, Satoshi Takemoto, Yoshitaka Narishima, Yoshiaki Kawatsura, Kiyoshi Watanabe
  • Publication number: 20020043400
    Abstract: A technique for attaining a large capacity of a memory card type semiconductor device is disclosed. A Cu pattern is formed centrally of a bending portion (BAL) on a flexible substrate and Cu patterns are formed at end portions of mounting areas (MAL, MAC) located on both sides of the bending portion. When the flexible substrate is bent along the bending portion (BAL), only film exposed portions present on both sides of the Cu pattern are bent with a small radius of curvature and the end portions of the mounting areas (MAL, MAC) and the vicinities thereof are kept flat.
    Type: Application
    Filed: August 8, 2001
    Publication date: April 18, 2002
    Applicant: Hitachi, Ltd.
    Inventor: Minoru Shinohara
  • Publication number: 20020043087
    Abstract: The present invention controls the ever-changing thermal crowns to give good strip shapes during rolling without causing any flaws in the rolled surfaces and with quick responses to ever-changing thermal crowns.
    Type: Application
    Filed: August 30, 2001
    Publication date: April 18, 2002
    Applicant: HITACHI, LTD.
    Inventors: Yujirou Kobayashi, Toshiyuki Kajiwara, Tatsuaki Nyui, Yuuji Kikuchi, Yasutsugu Yoshimura, Shigekazu Yamada
  • Publication number: 20020045813
    Abstract: A method for processing biomagnetic fields generated by biocurrents resulting from activities of human brain or myocardia and its mapping apparatus are provided, which features biomagnetic measurement and its analysis, magnetic field mapping and its imaging and their waveform generation by a simple operation. Biomagnetic fields emitted from the patient are measured at a plurality of measurement positions, and a contour map of magnetic field obtained as a result of processing of these measured biomagnetic fields is imaged in the magnetic contour map display apparatus, which display apparatus comprises: the process function display area indicating process function items including measurement; and the analysis data display area which displays the waveform together with a designated measurement time, the waveform being generated during measurement at least based on the measured biomagnetic fields and during the designated measurement period of time.
    Type: Application
    Filed: October 30, 2001
    Publication date: April 18, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Hiroyuki Suzuki, Keiji Tsukada, Kazuhisa Machida, Takafumi Kawasaki
  • Publication number: 20020043974
    Abstract: A magnetic sensor is constructed to be capable of detecting the change of tunnel current due to co-tunneling effect at a high S/N ratio by using a tunneling magneto-resistive element having a first magnetic layer of a soft magnetic material formed on a flat substrate, first and second tunnel barrier layers formed on the first magnetic layer, magnetic particles of a ferromagnetic material provided between the first and second tunnel barrier layers, and a second magnetic layer of a soft magnetic material formed on the second tunnel barrier layer so as to create tunneling junctions.
    Type: Application
    Filed: December 18, 2001
    Publication date: April 18, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Toshihiko Sato, Ryoichi Nakatani, Nobuyuki Inaba
  • Publication number: 20020044049
    Abstract: An on-vehicle breakdown-warning report system is disclosed. an occurrence of break-down is detected and judged based on a signal in an electronic control system installed on a control apparatus for an engine ignition system, a charging system, an engine fuel system, a engine cooling system, a power transmission system, and an oil lubricating system of an automobile or a diagnosis display system; and a diagnostic data is sent to an information terminal device of a diagnosis and maintenance agency or a service company having a diagnosis and maintenance agency as a contents information by using an on-vehicle mobile communication apparatus, and an action for an emergency measures and a maintenance schedule is asked.
    Type: Application
    Filed: August 30, 2001
    Publication date: April 18, 2002
    Applicant: Hitachi, Ltd.,
    Inventors: Masahiko Saito, Kozo Nakamura, Toshio Manaka, Takashi Nakahara
  • Publication number: 20020043990
    Abstract: There is provided a logic circuit causing the same delay time as a conventional logic circuit and acting as a D flip-flop circuit with a data-selecting function.
    Type: Application
    Filed: September 6, 2001
    Publication date: April 18, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Yohei Akita, Naoki Kato, Kazuo Yano
  • Publication number: 20020044084
    Abstract: A collection/delivery work support system which can eliminate erroneous delivery of goods, missing delivery and missing collection in collection/delivery service to greatly improve the efficiency of collection of goods. A collection/delivery navigation system for determining and indicating a route for delivery and collection of goods and managing collection and delivery conditions has an electronic slip which stores information described in a slip of a commodity and has a function of transmitting the stored information in response to an external request for information, and a navigation unit for indicating a route for collection and delivery of goods and collection and delivery conditions.
    Type: Application
    Filed: November 19, 2001
    Publication date: April 18, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Masakazu Itoh, Manabu Miyatake
  • Publication number: 20020043575
    Abstract: A press-machined fuel induction pipe 40, a hollow tubular type of fixed core 1 with a flange at its upper end, and a nozzle holder 18 that was press-machined into a slender tubular shape and has an orifice plate equipped with a valve seat at the lower end of the nozzle holder, are connected by welding. The upper inner surface of nozzle holder 18 and the outer surface of fixed core 1 are welded after being press-fit. A movable core 14 and a valve body 16 are connected to the welded assembly via a point 15 having a spring function. On the outer surface of nozzle holder 18 is provided an electromagnetic coil 2, the outside of which is provided with a tubular yoke 4 whose upper end is connected by welding to the flange 1a of fixed core 1 and whose lower end is press-fit on the outer surface of nozzle holder 18.
    Type: Application
    Filed: September 4, 2001
    Publication date: April 18, 2002
    Applicant: Hitachi Ltd.
    Inventors: Atsushi Sekine, Kiyotaka Ogura, Ryuya Ando, Makoto Yamakado, Noriyuki Maekawa
  • Publication number: 20020045445
    Abstract: A cellular phone capable of informing a user of the deterioration of a line speech quality by raising an alarm. In the cellular phone according to the present invention, the condition in which the saturation of a transmission output lasts for a predetermined period of time or longer is detected, and a deterioration in the uplink speech quality is thereby predicted, an alarm signal being sent out to the cellular phone. Thus, the user is notified that a deterioration in the uplink speech quality occurs.
    Type: Application
    Filed: April 27, 2001
    Publication date: April 18, 2002
    Applicant: HITACHI, LTD.
    Inventor: Kazutoshi Higuchi
  • Patent number: 6370866
    Abstract: Operational reliability of a gas turbine is improved by suppressing the thermal stress and thermal deformation acting on the rotor of the gas turbine. The gas turbine has a rotor shaft constructed by arranging, in an axial direction, a plurality of discs each having a plurality of combustion gas-driven moving blades annularly arranged on the peripheral portion and spacers arranged between the discs. Gap portions are formed between a region on the rotor shaft center portion side of the discs facing the spacers and spacers adjacent thereof. Contact surfaces are formed which contact on both a region on the rotor peripheral side of the discs facing the spacers and adjacent spacers thereto. Furthermore, a third flow path leading fluid to the above-mentioned gap portions is provided.
    Type: Grant
    Filed: January 5, 2001
    Date of Patent: April 16, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Shinya Marushima, Manabu Matsumoto, Kazuhiko Kawaike, Takashi Ikeguchi, Takashi Machida, Masaru Sekihara
  • Patent number: 6370768
    Abstract: A circuit board is provided, wherein electroless plating to fill via-holes can be controlled uniformly with desirable reproducibility, and via-hole portions can be identified from the surface of the substrate after forming a second conductor thereon. The specific circuit board is obtained by applying a potential higher then the potential of the electroless plating to the conductor on the surface when filling the via-holes by electroless plating. In the circuit board, via-hole portions can be identified optically, because the via-hole portion differs from the second conductor in surface condition, such as when a dent is formed.
    Type: Grant
    Filed: July 16, 1998
    Date of Patent: April 16, 2002
    Assignee: Hitachi, Ltd.
    Inventor: Takeyuki Itabashi
  • Patent number: 6373202
    Abstract: In a color cathode ray tube having a flat panel exterior surface, the screen distortion and the convergence give rise to problems. To overcome these problems, by arranging bar magnets in such a manner that they are disposed parallel to a screen and are shifted from upper and lower ends of a horizontal deflection coil of a deflection yoke by not less than 10 mm in the direction perpendicular to a tube axis, the distortion of the screen and the characteristics of the convergence can be simultaneously improved.
    Type: Grant
    Filed: October 31, 2000
    Date of Patent: April 16, 2002
    Assignee: Hitachi Ltd.
    Inventors: Yoshinori Ito, Takeshi Kaneki, Mitsuru Watanabe, Souichi Sakurai
  • Patent number: 6372367
    Abstract: A magnetic recording medium having a high reliability of durability against frictional motion can be ensured even in a severe rubbing test, while a low noise characteristic important for achievement of high-density recording is kept. A first underlayer made of an alloy containing Co or Ni as a main component and containing Cr and Zr simultaneously is formed over a base, a second underlayer having a rough surface is formed on the first underlayer, a third underlayer made of an alloy containing Ni as a main component and containing Cr and Zr simultaneously is formed over the second underlayer, a fourth underlayer as a film for controlling crystalline orientation is formed on the third underlayer, a magnetic layer made of an alloy containing cobalt a main component is formed over the fourth underlayer, and a protective film containing carbon as a main component is formed on the magnetic layer.
    Type: Grant
    Filed: May 11, 1999
    Date of Patent: April 16, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Yoshibumi Matsuda, Yotsuo Yahisa, Hiroyuki Suzuki, Koji Sakamoto, Yoko Ogawa, Hiroshi Tani, Susumu Funamoto, Akira Kato, Yuzuru Hosoe