Patents Assigned to Hitachi, Ltd.
  • Patent number: 5903843
    Abstract: A radio communication system and a traffic channel assignment method for realizing the assignment of traffic channels capable of improving the efficiency of use of frequency in the case where the traffic density is high and improving a radio link quality in the case where the traffic density is low. A base station judges the traffic density from a carrier to interference power ratio (CIR) on each channel capable of being selected as a traffic channel. In the case where the traffic density is low, a traffic channel assignment mode selecting an available channel having a greater CIR is assigned as a traffic channel to a mobile station. In the case where the traffic density is high, a traffic channel assignment mode selecting an available channel having a smaller CIR is assigned as a traffic channel to the mobile station. Thereby, it is possible to structure a radio communication system which can cope with the condition of the traffic density of the neighborhood.
    Type: Grant
    Filed: July 11, 1995
    Date of Patent: May 11, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Hideya Suzuki, Arata Nakagoshi, Masahiro Koya, Noriyuki Sugiura
  • Patent number: 5900629
    Abstract: A scanning microscope is provided for producing a scan image at high spatial resolution and in a low acceleration voltage area. An acceleration tube is located in an electron beam path of an objective lens for applying a post-acceleration voltage of the primary electron beam. The application of an overlapping voltage onto a sample allows a retarding electric field against the primary electron beam to be formed between the acceleration tube and the sample. The secondary electrons generated from the sample and the secondary signals such as reflected electrons are extracted into the acceleration tube through the effect of an electric field (retarding electric field) immediately before the sample. The signals are detected by secondary signal detectors located upwardly than the acceleration tube.
    Type: Grant
    Filed: March 20, 1998
    Date of Patent: May 4, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Hideo Todokoro, Makoto Ezumi
  • Patent number: 5899575
    Abstract: An object is to provide a video recording/playing apparatus for facilitating recording/playing of motion pictures.
    Type: Grant
    Filed: December 13, 1996
    Date of Patent: May 4, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Masataka Okayama, Tomohisa Kohiyama, Nobukazu Kondo, Kazutoshi Katoh, Kazuaki Tanaka, Yoshihiro Harada
  • Patent number: 5901254
    Abstract: The present invention provides an image reducing system and method capable of retaining fine lines in a reduced image by reducing an original image and by quickly forming the reduced image with high quality. The method includes specifying positions of pixels of a reduced image in the original image according to reduction ratios, extracting a run of pieces of the same color information about the color of the pixels of the original image as a line, determining the line width of the extracted line and determining the line width after reduction in the reduction ratios based on the line width of the extracted line and calculating the centroid of the extracted line, and retaining the color information about the extracted line at a reduced pixel near the centroid on the basis of the centroid of the extracted line and the line width after reduction. The method further performs the step of determining the color information about each reduced pixel based on the retained color information.
    Type: Grant
    Filed: August 12, 1997
    Date of Patent: May 4, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Hiroaki Iguchi, Yasuo Kurosu, Yoshihiro Yokoyama, Hiroshi Abei, Masaaki Fujinawa
  • Patent number: 5899074
    Abstract: A gas turbine combustor having a fuel injection nozzle for diffusion combustion disposed in a central portion of the combustor and an annular premixed nozzle disposed in an outer peripheral portion of the fuel injection nozzle for injecting a mixed gas of fuel and air. The annular premixed nozzle includes an annular premixing chamber and a plurality of premixed fuel nozzles for injecting fuel into the annular premixing chamber. The annular premix nozzle is divided by a partition (108) to form a plurality of premixing chambers each adjacent to the fuel injection nozzle for diffusion combustion. Each of the premixing chambers includes at least one of the premixed fuel nozzles. A mechanism is provided for supplying fuel to a predetermined number of the premixing chambers in a low load operation of the gas turbine and for supplying fuel to all of the premixing chambers in a high load operation.
    Type: Grant
    Filed: April 5, 1995
    Date of Patent: May 4, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Yasutaka Komatsu, Haruo Urushidani, Shigeru Azuhata, Nobuyuki Iizuka, Yasuyuki Watanabe, Hiroyuki Arai, Nariyoshi Kobayashi, Masaya Ohtsuka, Kazuyuki Ito
  • Patent number: 5900917
    Abstract: An image composing and displaying apparatus includes frame memory constituent elements of an identical structure, a video input section, a video output section, a controller for selecting connection of each element to the video input or output section, and an image drawing section for reading and writing video data from and in the elements. The memory elements can be used for the input and output operations and hence the size thereof can be easily expanded; moreover the numbers of the elements respectively connected to the video input and output sections can be adaptively varied.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: May 4, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Norifumi Yanai, Ryo Fujita, Koyo Katsura, Yasushi Fukunaga
  • Patent number: 5900694
    Abstract: A gas discharge display panel in which opaque bus electrodes are structured in a frame shape for making each display cell clear as viewed from outside of the front substrate, and the bus electrodes function as a black matrix of the display screen. Hence the integrity of the black display status is improved and the contrast is increased.
    Type: Grant
    Filed: January 2, 1997
    Date of Patent: May 4, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Eiji Matsuzaki, Nobuyuki Ushifusa, Seiichi Tsuchida, Teruo Takai
  • Patent number: 5900008
    Abstract: A semiconductor integrated circuit device comprising a one-chip microcomputer having a nonvolatile memory circuit to and from which write and read operations are carried out at high speed in keeping with the cycle time of the processor. Part of the memory circuit is set aside as a read-only area for accommodating a data processing program, and the rest of the memory is used to write and read data thereto and therefrom. With no need to optimize the assignments of the ROM and RAM parts in the memory circuit, the one-chip microchip is easy to design and manufacture with high productivity. With the program storage area established as desired, users enjoy more convenience use of the one-chip microcomputer than before.
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: May 4, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Akao, Kenichi Kuroda
  • Patent number: 5901281
    Abstract: A computer system has a plurality of processing units connected via one or more system buses. Each processing unit has three or more processors on a common support board (PL) and controlled by a common clock unit. The three processors perform the same operation and a fault in a processor is detected by comparison of the operations of the three processors. If one processor fails, the operation can continue in the other two processors of the processing unit, at least temporarily, before replacement of the entire processing unit. Furthermore, the processing unit may have a plurality of clocks (A,B) within the clock unit, with a switching arrangement so that the processors normally receive clock pulses from a main clock (A), but receive pulses from an auxiliary clock (B) if the main clock (A) fails. Switching between the main and auxiliary clock (A,B) involves comparison of the pulse duration from the clocks (A,B).
    Type: Grant
    Filed: May 3, 1995
    Date of Patent: May 4, 1999
    Assignees: Hitachi, Ltd., Hitachi Process Computer Engineering, Inc.
    Inventors: Takeshi Miyao, Manabu Araoka, Tomoaki Nakamura, Masayuki Tanji, Shigenori Kaneko, Koji Masui, Saburou Iijima, Nobuyasu Kanekawa, Shinichiro Kanekawa, Yoshiki Kobayashi, Hiroaki Fukumaru, Katsunori Tagiri
  • Patent number: 5901071
    Abstract: The composition of an alloy is inhomogeneous, so that the Fermi level of electrons in the surface of the alloy differs depending upon positions. It is accordingly considered that a part susceptible to corrosion and a part less susceptible thereto will coexist in the alloy. The corrosion rate of the alloy is indicated as the exponential function of a potential difference (.DELTA..PHI..sub.H) within an electric double layer. The potential difference remains unchanged as long as the Fermi level lies within the forbidden band of the electrons. However, in a range in which the Fermi level falls within the valence band of the electrons, the lowering thereof leads to the increase of the potential difference.
    Type: Grant
    Filed: June 28, 1995
    Date of Patent: May 4, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Masanori Sakai, Noriyuki Ohnaka, Yuichi Ishikawa, Haruo Fujimori, Yusuke Isobe, Takuya Takahashi
  • Patent number: 5900162
    Abstract: The present invention relates to a plasma etching method and apparatus, and more particularly to a plasma etching method and apparatus which are well suited for etching the samples of semiconductor device substrates, etc. In cooling a sample to a temperature not higher than 0.degree. C. which is a minimum temperature of water and subjecting the sample to an etching process with a gas plasma, an acceleration voltage which accelerates ions in the gas plasma toward the sample is repeatedly changed, whereby in a process based on low-temperature etching, an etching process producing no residue, being anisotropic and being highly selective is realized.
    Type: Grant
    Filed: July 26, 1991
    Date of Patent: May 4, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Hironobu Kawahara, Yoshinao Kawasaki, Yoshiaki Sato, Ryooji Fukuyama
  • Patent number: 5901144
    Abstract: A mobile radio communications system having a plurality of base stations accommodating a plurality of mobile stations through radio transmission channels, each of the base stations being connected to a mobile communications exchanger through a plurality of signal lines. Each of the base stations is provided therein with a signal line allocating function unit for selecting a particular signal line from a plurality of signal lines and for allocating a communication slot for a mobile station dominated by the base station at a particular slot position on the selected signal line, a radio channel allocating function unit for allocating a communication slot for the mobile station dominated by the base station at a particular slot position on a radio transmission channel at a particular frequency, and a radio signal delay control unit for performing delay control for a timing at which the base station transmits a radio signal to the mobile station dominated by the base station.
    Type: Grant
    Filed: April 9, 1996
    Date of Patent: May 4, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Takeshi Maki, Toshiro Suzuki, Yuji Fukai, Kenichi Aoyama
  • Patent number: 5901288
    Abstract: A network operating information setting system includes a design device, an automatic setting device and a network device. The design device has the function of producing a command chain of information which an operator designs using a GUI (Graphical User Interface) in order to store the command chain thus produced in a storage medium such as a floppy disk. In addition, the design device also has the function of reading out data from the storage medium in order to display the data thus read out. The automatic setting device has the function of reading out the command chain from the storage medium in order to transmit the command chain thus read out to the network device through a data transmission line. In this connection, an inverse command chain may be produced which is used to restore the network operating information to the original information in the network device.
    Type: Grant
    Filed: December 9, 1996
    Date of Patent: May 4, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Kenichi Kihara, Satoru Tezuka, Shigeru Miyake, Yoichiro Sakurai, Junji Inaba
  • Patent number: 5898264
    Abstract: A cathode ray tube includes a vacuum envelope formed of a panel portion having a phosphor screen on its inner surface and suspending a shadow mask therein, a neck portion having a stem sealed to one end thereof and a funnel portion for connecting the other end of the neck portion and the panel-portion. The stem has a plurality of stem pins annularly arrayed, sealed thereto and extending therethrough for supporting an electron gun in the neck portion. A stem mound is raised and formed integrally with the stem around a base of each of stem pins on a electron-gun-supporting side thereof. A first distance R1 is defined as a distance from a center axis of the neck portion to an inner wall in a region of the neck portion facing a major portion of the electron gun, a second distance R2 is defined as a distance from the center axis to an outside edge of the stem mound, measured at half an axial height of said stem mound, and a third distance is defined as a distance from an inner wall to the center axis.
    Type: Grant
    Filed: August 25, 1997
    Date of Patent: April 27, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Hisashi Nose, Takao Nakamura, Hidehiro Koumura
  • Patent number: 5898175
    Abstract: A mass spectrometer employing an ion source includes a capillary for spraying therethrough liquid into the atmospheres and an orifice through which a portion in the vicinity of a tip of the capillary is inserted, the orifice being designed in such a way that gases are caused to flow up to the tip of the capillary along a peripheral wall face of the capillary. The flow rate of gas in the vicinity of the tip of the capillary is about the sonic velocity, and a voltage is applied across the liquid flowing through the capillary and the orifice or an electrode arranged in the vicinity of the tip of the capillary.
    Type: Grant
    Filed: September 5, 1996
    Date of Patent: April 27, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Atsumu Hirabayashi, Yukiko Hirabayashi, Minoru Sakairi, Yasuaki Takada, Takayuki Nabeshima, Hideaki Koizumi
  • Patent number: 5897188
    Abstract: A liquid crystal display device which comprises: a shield casing made of a metal plate and having fixing pawls and fixing hooks; an middle frame for holding a liquid crystal display; and a lower casing for packaging back lights, wherein the fixing pawls of said shield casing are bent in corresponding recesses formed in the middle frame, and wherein the fixing hooks of said shield casing are fitted on corresponding projections formed on the lower casing.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: April 27, 1999
    Assignees: Hitachi, Ltd., Hitachi Device Engineering Co., Ltd.
    Inventors: Masumi Sasuga, Junichi Ohwada, Akira Kobayashi, Masaru Fujita, Hiroshi Nakamoto, Ryu Ono, Tsutomu Isono
  • Patent number: 5898695
    Abstract: An apparatus for filtering TS packets multiplexed with a plurality of programs and sending the filtered packets to decoders. A packet landing buffer is provided in a RAM used for a microprocessor for system control. After a channel is selected, the microprocessor filters video and audio data and performs a value added service process.
    Type: Grant
    Filed: March 27, 1996
    Date of Patent: April 27, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Yukio Fujii, Masuo Oku
  • Patent number: D409163
    Type: Grant
    Filed: July 2, 1998
    Date of Patent: May 4, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Yukinobu Maruyama, Yoshiaki Amano, Masao Miyawaki, Yoshinori Goko, Yasuyuki Suzuki
  • Patent number: D409214
    Type: Grant
    Filed: June 9, 1998
    Date of Patent: May 4, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Masayuki Ohki, Koji Suso, Atsutoshi Sato, Koji Mori, Atsuhiko Urushihara
  • Patent number: D409229
    Type: Grant
    Filed: July 31, 1998
    Date of Patent: May 4, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Matsubara, Masayuki Ohki, Atsuhiko Urushihara, Jun Furuya, Yuhei Abe, Koji Suso