Patents Assigned to Fujitsu
  • Patent number: 6182057
    Abstract: A genetic algorithm executing device, in which search of a genetic algorithm is improved, sets a distribution of characters at each position of character strings represent candidates of solution, obtain the degree of disorder at each position by the distributions of characters, set a larger mutation rate at the position of which degree of disorder is higher. This device performs a mutation operation on the character strings according to the mutation rates. This device generates the new character strings by selecting positions of which degrees of disorder are higher than a predetermined value, and changing the character at the selected positions.
    Type: Grant
    Filed: December 12, 1997
    Date of Patent: January 30, 2001
    Assignee: Fujitsu Limited
    Inventors: Yasuhiro Kikuchi, Hirofumi Doi
  • Patent number: 6181637
    Abstract: A memory device having memory cells at cross sections of word lines and bit lines, a word-line driver for driving the word lines in response to a first activation signal, a delay circuit for generating a second activation signal that delays the first activation signal, and a sense amp for amplifying the voltage read from the memory cell in response to the second activation signal, comprises: a first power-supply voltage that is supplied to the word-line driver, and a second power-supply voltage that is supplied to the delay circuit, where the second power-supply voltage is generated from the first power-supply voltage. In the present invention, there is a first power-supply voltage that is supplied to the word-line driver, and a second power-supply voltage that is supplied to the delay circuit.
    Type: Grant
    Filed: March 10, 2000
    Date of Patent: January 30, 2001
    Assignee: Fujitsu Limited
    Inventors: Koichi Nishimura, Atsushi Hatakeyama
  • Patent number: 6181531
    Abstract: A thin film magnetic head slider has a media opposing surface which is adapted to be opposed to a recording medium, and includes a sacrificial layer, on a substratum that has a surface for forming the media opposing surface having at least one rail. A tracking mechanism or loading/unloading mechanism can be provided on the slider. An electrostatic actuator suitable for driving such a mechanism includes a stationary section having a plurality of teeth parallel to each other, a movable section having a plurality of teeth parallel to the teeth of the stationary section, a support spring for supporting the movable section so that the movable section can be moved with respect to the stationary section in the tooth width direction.
    Type: Grant
    Filed: November 10, 1998
    Date of Patent: January 30, 2001
    Assignee: Fujitsu Limited
    Inventors: Takao Koshikawa, Hiroshi Maeda, Takahiro Imamura
  • Patent number: 6181305
    Abstract: A method of driving an AC type PDP according to the present invention includes a full screen write step of applying a write voltage higher than a discharge starting voltage to respective cells constituting a screen of the PDP to cause a discharge in the respective cells for accumulation of wall charges therein, the method comprising a write preparation step of applying to the respective cells an auxiliary write voltage lower than the discharge starting voltage and having the same polarity as that of the write voltage to cause a discharge in a charged cell having wall charges accumulated before the application of the auxiliary write voltage for inversion of the polarity of a wall voltage in the charged cell, the write preparation step being performed prior to the full screen write step, wherein the application of the write voltage in the full screen write step is performed within a period during which space charges resulting from the discharge caused in response to the application of the auxiliary write voltag
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: January 30, 2001
    Assignee: Fujitsu Limited
    Inventors: Nhan Thanh Nguyen, Akira Otsuka
  • Patent number: 6181680
    Abstract: In an ATM switch, after a communication path is properly set up, a continuity test is performed by passing an OAM cell through the communication path before initiating the transmission of user cells. After the transmission of user cells is initiated, a loopback test is performed by periodically inserting an OAM cell in a user cell flow. When a fault condition is detected as a result of the OAM cell loopback test, a peak cell rate environment is created by adding OAM cells to the user cells for a limited period of time, and communication quality is measured under the thus created environment. When a point-to-multipoint connection with a plurality of leaf points is set up, correspondence between each leaf point and a physical connection point is recorded in a table.
    Type: Grant
    Filed: November 25, 1996
    Date of Patent: January 30, 2001
    Assignee: Fujitsu Limited
    Inventors: Tatsuya Nagata, Kazuhiro Ozawa
  • Patent number: 6182023
    Abstract: An electromagnetic field intensity computing apparatus for computing electromagnetic field intensity of an electric circuit device in a moment method obtains according to the electric current distribution an electric current of a ground layer and models a transmission line, ground layer, dielectric portion, etc. to be analyzed. When a plate to be analyzed is divided into a plurality of patches, the regularity in given structure data is automatically extracted to compute the mutual impedance among a portion of patches and apply the computation result to other portions. When elements to be analyzed meet the conditions that the electric length of the elements is short and the elements are distant from each other, the mutual impedance can be computed in an approximation obtained under various conditions. Furthermore, approximating a portion near a pigtail portion of a coaxial cable using a polygon allows a vertical electric current to be properly connected to each unit.
    Type: Grant
    Filed: February 3, 1998
    Date of Patent: January 30, 2001
    Assignee: Fujitsu Limited
    Inventors: Shinichi Ohtsu, Makoto Mukai
  • Patent number: 6181854
    Abstract: An optical module including a plurality of leads, a substrate having a first groove and a plurality of conductor patterns electrically connected to the leads, a ferrule having a center hole in which an optical fiber is inserted and fixed, the ferrule being mounted in the first groove of the substrate so that one end of the ferrule projects from an end surface of the substrate, and an optical element mounted on the substrate for making conversion between light and electricity. The optical module further includes a transparent first resin for covering at least the optical element and the other end of the ferrule, and a second resin for enclosing all of the leads, the substrate, the ferrule, the optical element, and the first resin except the one end of the ferrule and a part of each of the leads.
    Type: Grant
    Filed: July 13, 1999
    Date of Patent: January 30, 2001
    Assignee: Fujitsu Limited
    Inventors: Takashi Kojima, Naoki Yamamoto, Hironao Hakogi, Yoshio Shimano, Kazunori Miura
  • Patent number: 6178396
    Abstract: A token is attached to a word class sequence whose probability of appearance in text data is equal to or more than a predetermined value. A set of words and tokens included in a word/token sequence concerning the text data, is separated so that a probability of generation of the word/token sequence concerning the text data becomes the highest. The token is then replaced with a phrase included in the text data.
    Type: Grant
    Filed: March 31, 1997
    Date of Patent: January 23, 2001
    Assignee: Fujitsu Limited
    Inventor: Akira Ushioda
  • Patent number: 6178420
    Abstract: The present invention is intended to allow a user to easily and precisely extract related terms through use of mutual information without requiring morphological analysis or syntax analysis, by constituting a related term extraction apparatus from preceding-and-subsequent term extraction means for extracting a preceding term occurring prior to a specified term or a subsequent term occurring subsequent to the same in text data; a frequency calculation means for calculating the occurrence frequencies of the specified term, the preceding terms, and the subsequent terms; probability-of-occurrence calculation means for calculating the occurrence probabilities of the preceding and subsequent terms together with the occurrence probability of the specified term; probability-of-concurrence calculation means for calculating the probabilities of the preceding and subsequent terms cooccurring with the specified term; order-dependent degree-of-association calculation means for calculating an order-dependent degrees of the
    Type: Grant
    Filed: August 10, 1998
    Date of Patent: January 23, 2001
    Assignee: Fujitsu Limited
    Inventor: Manabu Sassano
  • Patent number: 6176411
    Abstract: A paper transfer apparatus is provided which is incorporated in an electrophotographic printer having a photosensitive drum for printing on elongated paper. The paper transfer apparatus serves to transfer the elongated paper along a transfer path extending via the photosensitive drum. The paper transfer apparatus includes a discharge or scuff roller for pulling the elongated paper in a transferring direction. The discharge roller is spaced downstream from the photosensitive drum. The paper transfer apparatus also includes a pair of tractors for advancing the elongated paper along the transfer path. The tractors are spaced upstream from the photosensitive drum. Each of the tractors is provided with a presser member supported by a tractor lid of the tractor. The presser member serves to apply friction to the elongated paper when the tractor lid is in closed position.
    Type: Grant
    Filed: October 15, 1998
    Date of Patent: January 23, 2001
    Assignee: Fujitsu Limited
    Inventor: Seiji Suketomo
  • Patent number: 6178068
    Abstract: A quasi contact head comprises a slider with a flying surface opposed to a magnetic disk. A composite layer is formed on the slider at its trailing end so as to contain a head element such as an MR element. The head element is exposed at an exposure surface formed on the composite layer. A step serves to retract the exposure surface from the flying surface. An edge formed between the step and flying surface is subjected to grinding. The edge wears off during the initial rotation of the magnetic disk, so that the flying height of the slider can be set lower.
    Type: Grant
    Filed: October 23, 1998
    Date of Patent: January 23, 2001
    Assignee: Fujitsu Limited
    Inventor: Masaharu Sugimoto
  • Patent number: 6176423
    Abstract: The present invention provides an inexpensive, power-saving, and space-saving shutter device that may simplify the mechanism, multifunction each component, and reduce the number of components in comparison with the conventional shutter device. One linkage serves to open and close a shutter, as well as lock the shutter at the closing position. The number of components is reduced in comparison with the conventional structure which provides a plurality of separate devices for such opening, closing, and locking. In addition, the number of driving devices becomes reduced down to one, thereby saving power.
    Type: Grant
    Filed: December 10, 1998
    Date of Patent: January 23, 2001
    Assignee: Fujitsu Limited
    Inventor: Hiroyuki Egami
  • Patent number: 6178212
    Abstract: A retiming circuit able to constantly perform sampling by a clock at a center portion of input data and performing a correct discrimination of logic “1” and “0” even if there is duty fluctuation of a pulse, provided with delay unit for imparting a variable delay to input data or a clock; a reference clock generating unit for generating a reference clock synchronized with the clock; a first phase difference detection unit for detecting a phase difference between a rising edge of the reference clock and the rising edge of the input data; a second phase difference detection unit for detecting a phase difference between the rising edge of the reference clock and a falling edge of the input data; and an intermediate phase setting unit for calculating the intermediate phase of the input data based on the outputs of the first and second phase difference detection units, the delay being controlled based on the intermediate phase.
    Type: Grant
    Filed: March 16, 1998
    Date of Patent: January 23, 2001
    Assignee: Fujitsu Limited
    Inventor: Tamotsu Akashi
  • Patent number: 6177949
    Abstract: An optical write head operable in high speeds is provided with better printing results. The optical write head is arranged by an LED array constructed of a plurality of LEDs arrayed in a line form, one shift register used to store thereinto pixel data for a front half portion of this LED array, and the other shift register used to store thereinto pixel data for a rear half portion of this LED array. The optical write head is further arranged by registers for latching parallel pixel data outputted from these shift registers, and a driving circuit for simultaneously driving the LEDs employed in the LED array in response to patterns of the pixel data outputted from the registers when a control signal is inputted.
    Type: Grant
    Filed: December 7, 1998
    Date of Patent: January 23, 2001
    Assignees: Fujitsu Limited, Hitachi Cable Ltd.
    Inventors: Motohiro Tokairin, Tamotsu Nishiura, Hideo Tanaka
  • Patent number: 6176826
    Abstract: There is disclosed a home care system in which a center terminal and a patient terminal are detachably connected to each other through communication lines, such as a public telephone line, an ISDN (integrated services digital network), a CATV (cable television), a radio and the like, and further to center terminals and patient terminals which constitute such a home care system. The patient terminal has an urgency transmitter device for transmitting a predetermined urgency code to the center terminal, and the center terminal comprises an urgency receiver device for receiving, while connected to a first patient terminal, the urgency code transmitted from a second patient terminal, and an urgency alarm device for informing of the fact that the urgency code has been received.
    Type: Grant
    Filed: January 22, 1999
    Date of Patent: January 23, 2001
    Assignee: Fujitsu Limited
    Inventors: Takaki Shimura, Satoshi Mori, Keiichi Murakami, Nagaaki Koshino, Minoru Iwata, Takehito Takano, Keiko Nakamura, Junichi Koike, Keiichi Takeda
  • Patent number: 6178267
    Abstract: An image processing apparatus includes a threshold value processing circuit subjecting a correction value with respect to an input image data to a threshold value process and outputting an output image data, a subtracting circuit outputting an error signal based on a difference between the correction value and the output image data, an error filter distributing, as a distributing error data dependent on a value of a diffusion matrix, the error signal to neighborhood pixels of a target pixel within the input image data, and a correction circuit multiplying a coefficient to the input image data or the output image data.
    Type: Grant
    Filed: September 9, 1997
    Date of Patent: January 23, 2001
    Assignee: Fujitsu Limited
    Inventors: Kazuhiko Sato, Hiroshi Oshio, Shigeru Ainai, Hiromitsu Horie, Takao Kamata
  • Patent number: 6178545
    Abstract: As to an object-oriented programming, reuse of softwares is enhanced and running speed is improved. There are made up a data element list in which pointers to data storage areas of object A are arranged and a pointer element list in which pointers to pointer storage areas of object B are arranged. A combination of the data element list and the pointer element list makes it possible to directly refer to data of the object A from the object B.
    Type: Grant
    Filed: August 28, 1997
    Date of Patent: January 23, 2001
    Assignee: Fujitsu Limited
    Inventors: Fumio Nagashima, Kaori Suzuki, Asako Yumoto, Tsuguto Maruyama, Shigeru Sasaki, Ryousuke Suda, Miwa Ueki
  • Patent number: 6177786
    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: March 12, 1999
    Date of Patent: January 23, 2001
    Assignee: Fujitsu Limited
    Inventor: Hiroshi Shimamori
  • Patent number: 6177312
    Abstract: This invention relates to a method for removing contaminate nitrogen from the peripheral gate region of a non-volatile memory device during production of said device, wherein at least some of the contaminate nitrogen has formed a bond with the surface of the silicon substrate in contact with the gate oxide layer in said gate region, said method comprising: contacting said gate oxide layer and contaminate nitrogen with a gas comprising ozone at a temperature of about 850° C. to about 950° C. for an effective period of time to break said bond; and removing said gate oxide layer and contaminate nitrogen from said surface of said silicon substrate.
    Type: Grant
    Filed: March 26, 1998
    Date of Patent: January 23, 2001
    Assignees: Advanced Micro Devices, Inc., Fujitsu, Ltd., Fujitsu AMD Semiconductor Limited (FASL)
    Inventors: Yuesong He, John Jianshi Wang, Toru Ishigaki, Kent Kuohua Chang, Effiong Ibok
  • Patent number: 6178452
    Abstract: A client/server system wherein a file which has been repeatedly repaired for time equal to or more than certain times, a file which has been repeatedly repaired with frequency equal to or higher than a certain degree of frequency and a file having a file size equal to or larger than a certain size are backup-stored in the local backup file 24 of the client unit 2 itself and wherein when a file backed up in the local backup file 24 needs to be repaired, not repair by the server unit 1 but self-repair within the client unit 2 itself is effected. In such client/server system, when the number of client units increases, there is no need to review the capability of the server unit and of the transmission paths and then to redesign them and the addition of a client unit can be optionally made.
    Type: Grant
    Filed: January 5, 1999
    Date of Patent: January 23, 2001
    Assignee: Fujitsu Limited
    Inventor: Takashi Miyamoto