Patents Assigned to Fujitsu
  • Patent number: 6163170
    Abstract: A level converter includes a first circuit which converts a first level of a signal into a second level which is higher than the first level, and a second circuit which causes a potential of a given node of the level converter to be defined rapidly when the level converter is in a state other than a normal state in which the first circuit converts the first level of the signal into the second level.
    Type: Grant
    Filed: May 16, 1997
    Date of Patent: December 19, 2000
    Assignee: Fujitsu Limited
    Inventor: Yutaka Takinomi
  • Patent number: 6163217
    Abstract: A current charged into or discharged from a phase-compensating capacitor C1 in an output circuit is controlled by a level shift circuit so that the current is kept constant for input signals inputted to the input terminals IN+ and IN- of a differential amplifier circuit, and also a current charged into or discharged from a phase-compensating capacitor C2 is controlled by the current correcting circuit so that the current become equal to a constant current controlled by the level shift circuit, namely to a current charged into or discharged from the phase-compensating capacitor C1. Therefore, even if a quickly rising or falling signal is inputted into the differential amplifier circuit, the MOS transistor MP11 or MN11 is not set in an offset state, which prevents generation of an overshoot or an undershot in the output terminal.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: December 19, 2000
    Assignee: Fujitsu Limited
    Inventors: Kunihiro Matsubara, Hidenobu Ito, Shinichi Nakagawa
  • Patent number: 6163268
    Abstract: In an information processing system having a portable terminal unit, such as a hand-held computer, driven by a rechargeable battery and a data communication adaptor for enabling communication between the portable terminal unit and a host computer of the system, the terminal unit and the data communication adaptor are designed to minimize the size thereof in the following five ways. First, a memory card holding mechanism for connecting the memory card of the portable terminal unit is provided between a swinging back lid and a recess of the back casing. Second, a normal interface and a high-speed interface are both provided in the portable terminal unit and the the data communication adaptor respectively. Third, an auxiliary connector for an optional device to extend a function of the portable terminal Unit is provided in the opening of the casing of the portable terminal unit movable in three dimensions mounted on a printed circuit board.
    Type: Grant
    Filed: May 23, 1997
    Date of Patent: December 19, 2000
    Assignee: Fujitsu Limited
    Inventors: Takao Obata, Mitsuaki Kumagai, Akihiko Iura, Akio Murata, Shinji Yamamoto, Makoto Sato, Akira Okawado, Shinichiro Tsurumaru, Maki Miyata, Toshiyuki Kobayashi, Nobuaki Akasawa, Masahiko Okano, Takao Miyanaga
  • Patent number: 6163143
    Abstract: The DC output of a power conversion unit is controlled based on a pulse signal generated by a PWM unit. An operations unit detects an output current Iout, and determines the operation mode of a load based on the detected current value. When the output current Iout is weak, a value smaller than usual is written to a cycle register. The PWM unit generates a pulse signal according to the data stored in the cycle register and an on-time register.
    Type: Grant
    Filed: April 20, 2000
    Date of Patent: December 19, 2000
    Assignee: Fujitsu Limited
    Inventor: Hiroshi Shimamori
  • Patent number: 6163215
    Abstract: In a variable gain amplifier controlling a gain by using differential amplifiers with a gain control signal, a gain switchover differential amplifier or a bias circuit which composes a current mirror with the gain switchover differential amplifier is connected between a high and a low gain differential amplifier for the same bias current which are mutually connected to share load resistances for the same output polarity and a bias current source common to both of the differential amplifiers, to perform switchover operations of the high and the low differential amplifier by a gain control signal, and a current source which flows a fixed offset current through at least the low one of the high and the low differential amplifier is provided.
    Type: Grant
    Filed: April 22, 1999
    Date of Patent: December 19, 2000
    Assignee: Fujitsu Limited
    Inventors: Kohei Shibata, Satoshi Ide
  • Patent number: 6163478
    Abstract: An alterable Common Flash Interface ("CFI") is disclosed which includes a storage array which stores the CFI data. The storage array provides sub-circuits for encoding the CFI data. The sub-circuits comprise elements which can be altered by changing a single metal layer of the fabrication process.
    Type: Grant
    Filed: October 19, 1999
    Date of Patent: December 19, 2000
    Assignees: Advanced Micro Devices, Inc., Fujitsu, Ltd.
    Inventors: Yasushi Kasa, Fan W. Lai
  • Patent number: 6163618
    Abstract: A paper discriminating apparatus has a data correction unit for generating image data associated with non-sensed areas, which are not detected by any of the sensor devices constituting a line sensor, and is capable of contributing to reduction of the sensor devices without producing any additional dictionary data.
    Type: Grant
    Filed: March 30, 1998
    Date of Patent: December 19, 2000
    Assignee: Fujitsu Limited
    Inventor: Masanori Mukai
  • Patent number: 6163526
    Abstract: A transmission system for transmitting data of a synchronous digital hierarchy SDH frame includes a transmission terminal, a transport terminal and a reception terminal linked together by a working channel line and a protection channel line in a redundant structure. Each of the transmission terminal and the transport terminal includes an alarm indication insertion unit which inserts an alarm indication in the SDH frame, the alarm indication indicating whether a related channel line has failed. The SDH frame containing the alarm indication is transmitted to the reception terminal prior to transmission of the data on the related channel line. The reception terminal includes a control unit which outputs a selected one of the SDH frame on the working channel line and the SDH frame on the protection channel line in response to the alarm indication received by the control unit.
    Type: Grant
    Filed: April 6, 1998
    Date of Patent: December 19, 2000
    Assignee: Fujitsu Limited
    Inventor: Hiroya Egoshi
  • Patent number: 6160736
    Abstract: The present invention is a memory circuit having memory cell array transistors with floating gates, wherein the boost ratio of the boosted voltage generating circuit is varied so that the boosted voltage level for driving wordlines during reading becomes constant depending on the power source voltage level. Specifically, when the power source voltage decreases, the boost ratio increases and when the power source voltage increases, the boost ratio decreases. As a result, the boosted voltage for driving wordlines during reading can be maintained within a prescribed range and appropriate read operations can be ensured.
    Type: Grant
    Filed: February 8, 1999
    Date of Patent: December 12, 2000
    Assignee: Fujitsu Limited
    Inventor: Kazuhide Kurosaki
  • Patent number: 6159858
    Abstract: A slurry contains MnO.sub.2 or other manganese oxide as a primary component of abrasive particles. Further, a polishing process using such a manganese oxide abrasive and a fabrication process of a semiconductor device using such a polishing process are disclosed.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: December 12, 2000
    Assignees: Fujitsu Limited, Mitsui Mining & Smelting Co., Ltd.
    Inventors: Sadahiro Kishii, Ko Nakamura, Yoshihiro Arimoto, Akiyoshi Hatada, Rintaro Suzuki, Naruo Ueda, Kenzo Hanawa
  • Patent number: 6160558
    Abstract: Disclosed are an animation creating method and system for creating an executive scenario of animation while reducing a load to be imposed by animation reproduction, and an animation reproducing method and system for reproducing the executive scenario. A scenario described in the form of paired data including identifiers of frame data items and reproduction tempos is input. When frame data items are reproduced at intervals of a designated unit reproduction time, the number of frame data items needed to realize each reproduction tempo is calculated. An identifier of a frame data item associated with the reproduction tempo is copied so that the same number of identifiers as the calculated number of frame data items can be produced. Thus, an executive scenario composed of a series of frame data items is created. It is then detected whether or not the cycle of the unit reproduction time has elapsed.
    Type: Grant
    Filed: March 6, 1998
    Date of Patent: December 12, 2000
    Assignee: Fujitsu Limited
    Inventor: Kunio Motegi
  • Patent number: 6161143
    Abstract: A data transfer system enables a terminal to download data from a base station through another terminal even if the terminal in question is unable to communicate with the base station. The system includes the base station connected to a host system, and terminals for communicating with the base station. The terminals download data from the host system through the base station. If a given terminal is unable to communicate with the base station, the given terminal downloads the data from a second terminal, if the data is stored in the second terminal. Also provided is a method of realizing such a data transfer system.
    Type: Grant
    Filed: July 21, 1998
    Date of Patent: December 12, 2000
    Assignee: Fujitsu Limited
    Inventors: Hideyuki Tayama, Akihiko Iura
  • Patent number: 6161058
    Abstract: A library apparatus of the present invention has directors which respectively determine operations of two carrying devices traveling along one traveling path. A servo control units move the carrying devices based on the determination of the directors. The serv control units obtain positional data of the carrying devices, and judge whether or not the carrying devices come into contact with each other by comparing these pieces of positional data. The servo control unit, when judging that the carrying devices come into contact with each other, stops a driving circuit of each carrying device. A drive of a motor for supplying each carrying device with power is thereby stopped, and the carrying device is stopped.
    Type: Grant
    Filed: January 30, 1998
    Date of Patent: December 12, 2000
    Assignee: Fujitsu Limited
    Inventors: Hiroaki Nishijo, Shinobu Sasaki
  • Patent number: 6161056
    Abstract: An area division unit divides a part placement area into a plurality of divided areas based on an area granularity. A part gravity value operation unit and a parts replacement unit extract a set of parts at each end of a connection line for each placement according to a connection line definition table and a parts placement table. If each part belonging to the set of parts obtained in the second process exists in a different divided area for each connection line, then the placement of each part belonging to a divided area is amended in the divided area in such a way that a connection line length between the parts can be shortened. A repetition control unit repeats a series of the above described processes while optionally changing a division starting position of the area division unit. An area granularity change unit repeats the series of the processes up to this point while gradually reducing an area granularity each time the above described series of processes terminate.
    Type: Grant
    Filed: February 13, 1998
    Date of Patent: December 12, 2000
    Assignee: Fujitsu Limited
    Inventor: Shinji Sato
  • Patent number: 6160816
    Abstract: A first group of asynchronous clock converters effect the conversion between a DNE clock and an RDT clock to which DS-0 data and signalling data are synchronized, for the data items which are transferred between a cross-connector and a DNE. A second group of asynchronous clock converters effect the conversion between a CPE clock and the RDT clock to which DS-0 data and signalling data are synchronized, for the data items which are transferred between the cross-connector and a CPE. As a result, cross-connect processes based on the single RDT clock are realized, and loop timings are guaranteed for the DNE and the CPE.
    Type: Grant
    Filed: July 29, 1997
    Date of Patent: December 12, 2000
    Assignee: Fujitsu Limited
    Inventors: Kazuo Tanaka, Eiji Shimose
  • Patent number: 6161163
    Abstract: Data transferred from a host computer to a memory device is written into sectors whose addresses in a memory area are decoded by a decode table. Old data to be updated by the above data is erased or marked with erase flags. At a predetermined point of time, in order to create free areas, necessary data is evacuated to a primary memory media and unnecessary data indicated by erase flags is erased by a unit of predetermined memory size. Part of the memory media which has become defective is marked with a defect flag, and is replaced by an alternate area. In doing so, the decode table is rewritten to rearrange the memory area.
    Type: Grant
    Filed: August 30, 1999
    Date of Patent: December 12, 2000
    Assignee: Fujitsu Limited
    Inventors: Shinpei Komatsu, Yumi Ishii, Tomohiro Hayashi, Shogo Shibazaki, Hiroyuki Itoh, Masaru Takehara
  • Patent number: 6159795
    Abstract: An intermediate implant step is performed to optimize the performance of the transistors in the peripheral portion of a floating gate type memory integrated circuit. The polysilicon layer (Poly 1) that forms the floating gate in the respective floating gate type memory devices prevents penetration of the optimizing implant into the core region in which the floating gate memory devices are formed. This permits the optimization implant to be performed without the need for an additional mask, thus reducing costs and production time.
    Type: Grant
    Filed: July 2, 1998
    Date of Patent: December 12, 2000
    Assignees: Advanced Micro Devices, Inc., Fujitsu Limited
    Inventors: Masaaki Higashitani, Hao Fang, Narbeh Derhacobian
  • Patent number: 6160942
    Abstract: Optical phase conjugation is applied to an optical fiber communication system. The system comprises a transmitter for outputting signal light, a phase conjugator, a receiver, a first single mode fiber laid between the transmitter and the phase conjugator, and a second single mode fiber laid between the phase conjugator and the receiver, wherein parameters such as signal light frequencies in the fibers are set adequately. This system is capable of compensating for any waveform distortion derived from chromatic dispersion and optical Kerr effect.
    Type: Grant
    Filed: April 27, 1999
    Date of Patent: December 12, 2000
    Assignee: Fujitsu Limited
    Inventor: Shigeki Watanabe
  • Patent number: 6160081
    Abstract: The invention relates to a photosensitive polyimide resin composition comprising (A) a polyamic acid having, in its main chain, repeating units formed from a polycondensation product of at least one tetracarboxylic acid or tetracarboxylic anhydride thereof with at least one diamine compound, and having actinic ray-sensitive functional groups at both terminals thereof; (B) a photosensitive auxiliary having a photopolymerizable functional group; (C) a photopolymerization initiator; and (D) a solvent, wherein 1 the polyamic acid is such that when the repeating unit represented by the formula (1) is defined as a unit molecular weight, a unit molecular weight per carboxyl group (unit molecular weight/COOH) falls within a range of from 200 to 300, and 2 the photosensitive resin composition permits the formation of a polyimide film having a residual stress of 40 MPa or lower and a coefficient of thermal expansion of 30 ppm/.degree. C.
    Type: Grant
    Filed: October 30, 1998
    Date of Patent: December 12, 2000
    Assignees: Nippon Zeon Co., Ltd., Fujitsu Limited
    Inventors: Akira Tanaka, Kei Sakamoto, Kenichi Ito, Yasuhiro Yoneda, Kishio Yokouchi, Yasuo Naganuma
  • Patent number: 6161010
    Abstract: A fault monitoring apparatus for a mobile communication system is capable of quickly detecting a fault and will prevent a radio wave level measurement test from being carried out unnecessarily. A call loss information collecting unit detects the numbers of outgoing and incoming calls and the numbers of base-station-disconnected calls in respective components of base stations, and accumulates and stores the detected numbers in corresponding memory areas of a call loss information table. A test region determining unit reads the accumulated numbers of outgoing and incoming calls and the accumulated numbers of base-station-disconnected calls from the call loss information table, and calculates call loss probabilities in the respective components. The test region determining unit also specifies a component of the base stations which is to be automatically tested for fault detection, based on the calculated call loss probabilities.
    Type: Grant
    Filed: September 25, 1998
    Date of Patent: December 12, 2000
    Assignee: Fujitsu Limited
    Inventor: Naoki Oguri