Patents Assigned to Fujitsu
  • Publication number: 20020125924
    Abstract: It is intended to provide a compact circuit configuration used for a frequency multiplier device, suitable to selectively output among a plurality of multiplied frequencies, with less power consumption. The frequency multiplier device uses an input frequency signal f and an output multiplied signal nf to form original signals a and c, as well as phase shifted signals b and d that are phase shifted to ±&pgr;/2 from the original signals a and c, the signals are mixed in a mixer circuits 16 and 17 and summed in a summing amplifier 18 to generate an output frequency signal fOUT. The phase inverter circuit (differential amplifier circuit) 14 and selector circuit (SEL1) 33) controls the phase inversion of one of signals to selectively output one of mixed frequencies (n±1) f as the output frequency signal fOUT.
    Type: Application
    Filed: August 28, 2001
    Publication date: September 12, 2002
    Applicant: FUJITSU LIMITED
    Inventors: Yasuhiro Kurogouchi, Kazuyoshi Arimura, Yoshinobu Hattori
  • Publication number: 20020127759
    Abstract: An n type InP buried layer 22 with Se or S added in an above 5×1018 cm−3 concentration is formed on an active layer mesa stripe 18 having a surface with an SiO2 film 16 formed on at a peripheral part of the mesa stripe 18 other than the surface with the SiO2 film 16 formed on. Accordingly, the buried layer can be grown without the over growth.
    Type: Application
    Filed: September 6, 2001
    Publication date: September 12, 2002
    Applicant: Fujitsu Quantum Devices Limited
    Inventor: Takayuki Watanabe
  • Publication number: 20020129141
    Abstract: In a message notification apparatus, message-type information defining one or more types of messages of which an operator is to be notified, and notification-manner information defining at least one manner in which the operator is to be notified of reception of each of the one or more types of messages are defined and stored. The message notification apparatus receives user-situation information indicating a situation of the operator. When the message notification apparatus receives a message, the message is compared with the one or more types of messages, and at least one notification manner is determined based on the notification-manner information and the user-situation information when the message is one of the one or more types of messages. Then, the message notification apparatus notifies the operator of reception of the message in the at least one notification manner.
    Type: Application
    Filed: May 3, 2002
    Publication date: September 12, 2002
    Applicant: FUJITSU LIMITED
    Inventors: Katsumi Sogabe, Yuji Izumi
  • Publication number: 20020126353
    Abstract: When a branching unit combines a first optical signal transmitted from a branch station with a second optical signal which is different in power level from the first optical signal and is transmitted from a terminal station A or B in an optical add-drop system, the S/N ratio of the lower power level of the two different power levels decreases, thereby deteriorating the system performance. Therefore, a dummy light is transmitted together with an optical signal to adjust the power level of the optical signal. Otherwise, an optical attenuator or an active optical signal level adjustment unit is provided for the branching unit so that both optical signals to be combined can be equal in level.
    Type: Application
    Filed: April 30, 2002
    Publication date: September 12, 2002
    Applicant: Fujitsu Limited
    Inventors: Hiroyuki Iwata, Shinichirou Harasawa
  • Publication number: 20020127776
    Abstract: A semiconductor device includes a semiconductor element having a circuit surface on which a projection electrode is formed, a seal resin which seals the circuit surface of the semiconductor element while exposing at least an end part of the projection electrode, a connect surface that is to face a board when the semiconductor device is implemented on the board, a back surface which is opposite to the connect surface, a side surface arranged between the connect surface and the back surface, and an organic material layer formed on the side surface.
    Type: Application
    Filed: October 4, 2001
    Publication date: September 12, 2002
    Applicant: Fujitsu Limited
    Inventors: Shinsuke Nakajo, Norio Fukasawa, Takashi Hozumi, Shinya Nakaseko
  • Publication number: 20020126410
    Abstract: A storage medium life management method, storage device and storage system detect the life of a storage medium (1). Medium life management information (14) indicating the read/write state of a medium is recorded on the storage medium (1). A drive (5) reads out the medium life management information (14) from the storage medium (1) when the storage medium (1) is loaded, and updates the medium life management information (14) pursuant to the operation of at least one of the reading and writing of storage medium (1). Then, the drive (5) writes medium life management information (14) to the storage medium (1) when the storage medium (1) is unloaded. This medium life management information (14) is used for determination of the life of a medium in either a drive (5) or host (4). Since management information corresponding to an actual read/write state can be obtained, the deterioration of a storage medium can be accurately detected.
    Type: Application
    Filed: March 20, 2002
    Publication date: September 12, 2002
    Applicant: FUJITSU LIMITED
    Inventors: Koichi Doi, Kenichi Ogura, Akihito Ohki, Takashi Miyako, Youichi Takahashi
  • Patent number: 6446863
    Abstract: An electronic apparatus has an apparatus body into which one of first and second, different kinds of cards can selectively be inserted. The positions of connecting terminals of the first and second cards are different from each other. When one of the cards is inserted into said apparatus body, an electrical communication between the card and the apparatus body can be attained. The apparatus includes an apparatus body having connecting sections and an adapter which comprises a base portion, a connector member accommodated in the base portion for connecting the connecting terminals of the card to the connections sections of the apparatus body, and a unit for holding the connector member selectively at either one of two positions, in the base portion, in accordance with the kind of card.
    Type: Grant
    Filed: March 31, 2000
    Date of Patent: September 10, 2002
    Assignee: Fujitsu Limited
    Inventors: Shinichiro Tsurumaru, Fumio Mishina
  • Patent number: 6449194
    Abstract: Provided are first to fourth switch circuits of the same configuration as each other, each connected to complementary bus lines DB and *DB to be precharged to the same potential. In the-first switch circuit, switches 11 and 15 are connected between an input data signal line SI1 and the DB and between an input data signal line *SI1 and the *DB, respectively, and dummy switches 31 and 32 are connected between the SI1 and the *DB and between the *SI1 and the DB, respectively. Switches 11 to 18 are selectively on/off controlled by outputs of a decoder 20, whereas dummy switches 31 to 38 are normally off.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: September 10, 2002
    Assignee: Fujitsu Limited
    Inventor: Hideo Akiyoshi
  • Patent number: 6447971
    Abstract: The present invention provides a toner that contains release agent, does not cause contamination in an electrophotographic apparatus, and has environmental stability and charge stability. This release agent-containing toner includes a center portion that contains low-polarity release agent and pigment, and a surface layer formed by a resin phase that covers the center portion.
    Type: Grant
    Filed: February 5, 2001
    Date of Patent: September 10, 2002
    Assignee: Fujitsu Limited
    Inventors: Satoshi Takezawa, Tomoaki Tanaka
  • Patent number: 6449074
    Abstract: The present invention relates to an optical transmission device and an optical communication system applied to wavelength division multiplexing (WDM). The optical transmission device includes an optical multiplexer for wavelength division multiplexing a plurality of optical signals to generate WDM signal light and outputting the WDM signal light to an optical transmission line, a detecting unit for detecting a break of each optical signal according to the power of each optical signal, and a compensator for adding light having a predetermined wavelength to the WDM signal light when at least one of the optical signals is cut off. Through the structure of the present invention it becomes possible to prevent a deterioration in transmission quality in the case that the number of WDM channels is changed.
    Type: Grant
    Filed: March 16, 1998
    Date of Patent: September 10, 2002
    Assignee: Fujitsu Limited
    Inventors: Satoru Okano, Hiroshi Nishimoto, Kazuo Yamane, Takashi Tsuda, Yumiko Kawasaki
  • Patent number: 6448861
    Abstract: A limiter is connected with the output of a PLL to limit the amplitude of the output from the PLL. The output from limiter is supplied to a voltage-controlled oscillator (VCXO). The limiter determines the difference between the input signal and the output signal. If the difference exceeds a predetermined value, the change in the output from the limiter is limited to the predetermined value. If the difference does not exceed the predetermined value, the change in the output is considered to be a difference value.
    Type: Grant
    Filed: February 20, 2001
    Date of Patent: September 10, 2002
    Assignee: Fujitsu Limited
    Inventors: Noboru Kawada, Takashi Kaku, Takeshi Asahina, Tohru Ogawa, Hideo Miyazawa
  • Patent number: 6448877
    Abstract: An electromagnetic relay has a reduced height while maintaining a good voltage withstand. A base unit includes a metal plate member and a base mold made of a plastic, the metal plate member having a break fixed contact point and a break terminal and being insertion-molded with the base mold. A subassembly, including an electromagnet assembly and a movable leaf spring/armature assembly attached to the electromagnet assembly, is fixed to an upper side of the base unit. The electromagnet assembly includes a bobbin, a coil, an iron core and a yoke. The movable leaf spring/armature assembly includes a movable leaf spring having a movable contact point and an armature fixed to the movable leaf spring. A make terminal member having a make fixed contact point and a make terminal is fixed to the base unit. The base mold has a yoke attaching part to which the yoke of the electromagnet assembly is attached and a make terminal member attaching part to which the make terminal member is attached.
    Type: Grant
    Filed: December 3, 2001
    Date of Patent: September 10, 2002
    Assignee: Fujitsu Component Limited
    Inventors: Hideto Harayama, Shigemitsu Aoki, Yoshio Okamoto
  • Patent number: 6449681
    Abstract: A buffer access control circuit to access a buffer which is divided into an upper buffer and a lower buffer which are assigned the same address and a memory unit including the buffer access control circuit. The buffer access control circuit includes latch circuits which store data in response to upper and lower buffer access signals, and a first detection circuit which detects whether data latched by the latch circuits match. A modifying circuit inputs data to the first and second latches or inputs inverted data to the first and second latches when one of the upper and lower buffer access signals is generated and the detection circuit detects a match. In this manner, the buffer access control circuit is used to update an address one by one, without the use of a delay circuit when consecutively accessing the upper and lower buffers.
    Type: Grant
    Filed: November 21, 2001
    Date of Patent: September 10, 2002
    Assignee: Fujitsu Limited
    Inventors: Shinkichi Gama, Takeshi Nagase, Yoshiki Okumura, Tomohiro Hayashi, Yoshihiro Takamatsuya
  • Patent number: 6449231
    Abstract: A storage unit optically reproduces information from an optical recording medium of a type having a control region which is prerecorded with control information with an embossed shape and a data region in which data is recorded optically. The control information includes medium information peculiar to the recording medium, and the control region and the data region have mutually different recording densities. The storage unit is provided with a control device for switching a frequency of a read clock which is used when reproducing the control information and the data from the optical recording medium between a case where the control information is reproduced and a case where the data is reproduced.
    Type: Grant
    Filed: January 19, 1999
    Date of Patent: September 10, 2002
    Assignee: Fujitsu Limited
    Inventor: Takehiko Numata
  • Patent number: 6449115
    Abstract: A memory unit having a plurality of heads performing at least one of recording or reproducing operations on a storage medium is disclosed. The memory unit includes a first converter circuit for receiving head-selection signals as first parallel data and converting the head-selection signals to first serial data to be transmitted, and a second converter circuit for receiving the first serial data from the first converter circuit and converting the first serial data to second parallel data to be transmitted. The memory unit further includes a head control circuit for receiving the second parallel data from the second converter circuit and selectively driving the heads on the basis of the second parallel data.
    Type: Grant
    Filed: August 1, 2000
    Date of Patent: September 10, 2002
    Assignee: Fujitsu Limited
    Inventor: Shinichi Maki
  • Patent number: 6448609
    Abstract: A system and method detecting the presence of polysilicon stringers on a memory array using a polysilicon stringer monitor. The polysilicon stringer monitor includes a continuous type-2 layer of polysilicon forming a first row and a second row across the active region and covering the active region in-between the first and second rows. The polysilicon stringer monitor further includes a continuous type-1 layer of polysilicon extending under the first row, wherein the type-1 layer also covers the active area in-between the first and second rows as well as covers the active area under the second row.
    Type: Grant
    Filed: October 28, 1999
    Date of Patent: September 10, 2002
    Assignees: Advanced Micro Devices, Inc., Fujitsu Limited
    Inventors: Masaaki Higashitani, Hao Fang
  • Patent number: 6448106
    Abstract: Device modules with pins and methods for making device modules with pins are disclosed. One embodiment is directed to a method including forming a polymeric circuit structure having a first side and a second side on a substrate. The formed first side is adjacent to the substrate. A pin is bonded to the second side of the polymeric circuit structure. At least a portion of the substrate is removed to expose at least a portion of the first side of the polymeric circuit structure, and a device is mounted on the first side of the polymeric circuit structure.
    Type: Grant
    Filed: November 9, 1999
    Date of Patent: September 10, 2002
    Assignee: Fujitsu Limited
    Inventors: Wen-chou Vincent Wang, Thomas J. Massingill, Yasuhito Takahashi, Lei Zhang
  • Patent number: 6449070
    Abstract: An optical transmission device that can be applied to a wavelength-multiplexed optical transmission system includes a first part creating a supervisory control signal to be transmitted in optical formation together with an optical main signal, the supervisory control signal comprising a vector of elements respectively corresponding to wavelengths. The device further includes a second part converting a vector included in a supervisory control signal received from a remote optical transmission device into another vector by a process using a path matrix in the vector received forms diagonal elements of the path matrix, the above another vector being transmitted to a next stage in the wavelength-multiplexed optical transmission system.
    Type: Grant
    Filed: January 27, 1999
    Date of Patent: September 10, 2002
    Assignee: Fujitsu Limited
    Inventor: Futoshi Izumi
  • Patent number: 6449250
    Abstract: A method for switching a plurality of central devices including N working central devices and one protection central device of a N+1 redundancy structure provided on a LAN center, to the CATV transmission path side of which terminal devices are connected each through a cable modem, having router functions forming segments respectively at the sides of the LAN center and the CATV transmission path, and a working central device transmitting routing information of the segment on the CATV transmission path side to inform the LAN center segment of an existence of the segment on the transmission path side, so that the terminal devices are connected to appropriate networks via the LAN center, the method comprising the steps of maintaining control information of the plurality of working central devices and the protection central device to be monitored, detecting failure of a working central device by regularly polling the N working central devices, switching the detected, failed working central device to the prot
    Type: Grant
    Filed: October 13, 1998
    Date of Patent: September 10, 2002
    Assignee: Fujitsu Limited
    Inventors: Keiichi Otani, Takaya Yamamoto
  • Patent number: 6448666
    Abstract: The present invention relates to a method for forming an insulating film with a low relative dielectric constant. A method for forming an insulating film in terms of a plasma chemical vapor deposition, characterized in that a Si supply gas, an oxygen supply gas, and a fluorine supply gas are used a material gas to form said insulating film, and said insulating film is formed under a film forming condition that a density of said insulating film to be formed is equal to or more than 2.25 g/cm3.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: September 10, 2002
    Assignee: Fujitsu Limited
    Inventors: Hiroshi Kudo, Rika Shinohara