Patents Assigned to NEC Corp.
  • Publication number: 20100073231
    Abstract: A wide-angle null-fill antenna with no null in the depression angle range, an omni antenna using the same, and radio communication equipment. A null-fill antenna comprises a first antenna array including antenna elements arranged with a prescribed point as the center, and a second antenna array having amplitude characteristics substantially equal to those of the antenna elements forming the first antenna array. The first antenna array is excited so that the excitation amplitude distribution is to have symmetry with respect to the prescribed point, while the excitation phase distribution is to have point symmetry with respect to the prescribed point. The phase center of the first antenna array is substantially coincident with that of the second antenna array.
    Type: Application
    Filed: November 24, 2009
    Publication date: March 25, 2010
    Applicant: NEC Corp.
    Inventor: Norihiko Oomuro
  • Publication number: 20090016536
    Abstract: A data encryption system implemented by running on a cache-equipped computer an encryption program including transformation tables each of which contains a predetermined number of entries. All or necessary ones of the transformation tables are loaded into the cache memory before encryption/decryption process. This causes encryption/decryption time to be made substantially equal independently of the number of operation entries for the transformation table. It is very difficult to extract plain texts used to determine a key differential, resulting in difficulties in cryptanalysis.
    Type: Application
    Filed: August 12, 2008
    Publication date: January 15, 2009
    Applicant: NEC Corp.
    Inventor: Yukiyasu Tsunoo
  • Patent number: 7099907
    Abstract: An n-bit shift register 102 for shifting input data through successive bit stages and AND gates 103-i (i being 1 to n) corresponding to the bit stages of the shift register 102 are provided. A control circuit 101 feeds out control signals 107-i for on-off controlling the feeding of the outputs of the corresponding bit stages of the shift register 102. Multipliers 104-i multiply the on-off controlled data and predetermined filter coefficient data, and an adder circuit 105 adds together the output of the multipliers to derive an FIR filter output including ramp-up and -down. A ramp-up/-down signal is fed to a shift register in the control circuit 101, and ramp-up data is derived from the output of the adder circuit 105. Thus, the circuit can be readily constructed without scale increase.
    Type: Grant
    Filed: November 2, 2000
    Date of Patent: August 29, 2006
    Assignee: NEC Corp.
    Inventor: Masahiko Nakayama
  • Patent number: 7067436
    Abstract: In a method of forming a silicon oxide film, the silicon oxide film is formed on a substrate by the use of a plasma CVD method. A plasma-generating region is separated from a deposition region which includes excitation oxygen molecules and excitation oxygen atoms. Plasma of first gas containing oxygen atoms is formed in the plasma-generating region while second gas containing silicon atoms is supplied into the deposition region. First quantity of the excitation oxygen molecules and second quantity of the excitation oxygen atoms are controlled intentionally.
    Type: Grant
    Filed: April 27, 2004
    Date of Patent: June 27, 2006
    Assignees: NEC Corp., ANELVA Corp.
    Inventors: Katsuhisa Yuda, Ge Xu
  • Publication number: 20050263812
    Abstract: A semiconductor memory device having a transistor formed on a semiconductor substrate and a capacitor formed on the upper layer of the transistor and electrically connected to the transistor, includes: a cell contact which is formed on a first interlayer insulation film covering the transistor and is electrically connected to the transistor; a bit contact which is formed on a second interlayer insulation film provided on the first interlayer insulation film and is electrically connected to the cell contact; a bit line which is formed on the second interlayer insulation film and is connected to the bit contact; a capacitor which is formed on a third interlayer insulation film covering the bit line; a capacitor contact which is formed through the third and second interlayer insulation film and makes a connection between the capacitor and the cell contact; and a side wall which has an etching selectivity with the second and third interlayer insulation films formed on the surface of the bit line.
    Type: Application
    Filed: August 12, 2005
    Publication date: December 1, 2005
    Applicant: NEC Corp.
    Inventors: Ken Inoue, Shintaro Arai
  • Patent number: 6785473
    Abstract: Disclosed is a WDM network which has: a lightwave path which connects between clients and each of which is provided with an overhead, and a sub-network which is defined by dividing the WDM network. In this WDM network, the sub-network has a partial lightwave path to go through the sub-network, the overhead has a partial lightwave path supervisory control information region which is terminated at both nodes of the partial lightwave path, and when a fault occurs on a lightwave path, the fault information of partial lightwave path including the position information of fault occurred is added to the partial lightwave path supervisory control information region of the overhead.
    Type: Grant
    Filed: March 7, 2000
    Date of Patent: August 31, 2004
    Assignee: NEC Corp.
    Inventors: Shinobu Sasaki, Tatsuya Shiragaki, Shinya Nakamura, Takashi Yamazaki
  • Patent number: 6754291
    Abstract: A method of outputting a demodulation result for soft-decision decoding is provided, which is comprised of the steps of: (a) detecting a channel distortion of a received signal generated in a communication channel using a training signal contained in the received signal and a reference training signal, outputting a channel distortion data: (b) generating a distortion-based reliability data from the channel distortion data; (c) compensating the received signal using the channel distortion data, generating a compensated, received signal; (d) demodulating the compensated, received signal and deciding the received signal thus demodulated using a soft decision technique, outputting a decision result; and (e) outputting a demodulation result using the decision result and the distortion-based reliability data.
    Type: Grant
    Filed: March 13, 2000
    Date of Patent: June 22, 2004
    Assignee: NEC Corp
    Inventors: Kazuhiro Okanoue, Takeshi Yamamoto
  • Patent number: 6744565
    Abstract: A biaxial driving mechanism, an image inputting apparatus used this biaxial driving mechanism and a light projecting apparatus used this biaxial driving mechanism, in which a mirror positioned in front of a camera or a light projecting instrument is rotated biaxially, and takes an image of a desiring direction or projects an image to a desiring direction without having an electric connection between the mirror and a driving part, are provided. In the biaxial driving mechanism, a horizontal rotating mechanism provides a ring gear, whose center axis is the same as that of an optical axis of a camera, holds a mirror, and a motor for rotating the ring gear around the optical axis of the camera.
    Type: Grant
    Filed: November 22, 1999
    Date of Patent: June 1, 2004
    Assignee: NEC Corp.
    Inventors: Atsushi Kashitani, Toshiyasu Nakao
  • Patent number: 6735325
    Abstract: The invention provides an identification data insertion and detection system for digital data which improves the detection ratio when an image is converted into frequency components and electronic watermark data are embedded in a portion of an image having a strong frequency component and besides allows a statistical similarly to be calculated with a higher degree of accuracy.
    Type: Grant
    Filed: April 15, 2002
    Date of Patent: May 11, 2004
    Assignee: NEC Corp.
    Inventor: Yutaka Wakasu
  • Patent number: 6602938
    Abstract: This invention is a flame resistant polycarbonate resin composition characterized by blending 0.01-2 weight parts of a silicone compound (B)) wherein a main chain has a branch structure and having an aromatic group in an organic substituent, 0.01-2 weight parts of an alkali metal salt of an aromatic sulfonic acid (C) represented by the following general formula 1 (hereafter, referred to as general formula 1), and 0.05-5 weight parts of a fiber-forming fluorine-containing polymer (D), relative to 100 parts of a polycarbonate resin (A): General formula 1: Am—R—(SO3M)n (wherein, R is a phenyl group, naphthyl group, or a phenyl group or naphthyl group substituted by A, where A is at least one type of substituent chosen from a group comprising a halogen atom, alkyl group, aryl group, vinyl group, alkoxy group, amino group, methyl ester group and ethyl ester group, and M is an alkali metal.
    Type: Grant
    Filed: October 11, 2001
    Date of Patent: August 5, 2003
    Assignees: Sumitomo Dow Ltd., NEC Corp.
    Inventors: Masatoshi Iji, Shin Serizawa, Satoshi Umeyama, Tadashi Shinomiya, Ichiro Sato
  • Patent number: 6556137
    Abstract: A passenger detecting system includes an antenna electrode, a signal generating circuit, a detecting circuit, and a control circuit. The antenna electrode is provided in a seat to be occupied by a passenger. The signal generating circuit generates and supplies a supply signal to the antenna electrode through a resistor such that an electric field is generated around the antenna electrode. The detecting circuit includes the resistor, and detects a direct current data signal from a line voltage associated with a voltage drop across the resistor, wherein the line voltage changes depending upon an object on the seat. The control circuit determines from the detected direct current data signal, whether or not a passenger is present in the seat and whether the passenger is an adult or a child.
    Type: Grant
    Filed: July 27, 1999
    Date of Patent: April 29, 2003
    Assignee: NEC Corp.
    Inventors: Yoshitaka Oka, Satoshi Baba
  • Patent number: 6552999
    Abstract: In an asynchronous transfer mode network (401), a network controller (404) is connected to terminal equipment units (406) through logic transmission line circuits (408) so as to receive a call signal which includes a parameter representative of a network class and which is produced by one of the terminal equipment units. Each of the terminal equipment units is connected to one of ATM exchangers (402) each of which is connected to at least one of them. The control network controller is connected to the ATM exchangers through logic transmission line circuits (405) so as to order them to admit a connection required by the call signal.
    Type: Grant
    Filed: September 5, 1997
    Date of Patent: April 22, 2003
    Assignees: NEC Corp., Nippon Telegraph and Telephone Corp.
    Inventors: Toshio Iwase, Shinichi Nakajima, Kisaku Fujimoto, Hisazumi Tsuchida
  • Patent number: 6496937
    Abstract: A password updating apparatus includes a current password storage section, a seed data storage section, a password generating section, a new password storage section, an access requesting section, and an update requesting section. In the current password storage section, a currently set current password is stored. In the seed data storage section, seed data serving as a seed for generating a password is stored. In the generation data storage section, generation data for generating a password is stored. The password generating section generates a new password from the seed data stored in the seed data storage section in accordance with the generation data stored in the generation data storage section. The new password storage section stores the new password generated by the password generating section. The access requesting section requests access to another computer through a communication line by using the current password stored in the current password storage section.
    Type: Grant
    Filed: January 12, 1999
    Date of Patent: December 17, 2002
    Assignee: NEC Corp.
    Inventor: Masaki Ichihara
  • Patent number: 6491541
    Abstract: A USB cable fixture for fixing a USB cable with a USB connector to a computer is composed of a base portion, an attaching portion, and a fastening portion. The attaching portion extends from the base portion in a first direction and is attached to a housing of the computer. The fastening portion extends in a second direction orthogonal to the first direction on an opposite side of the base portion to the attaching portion. The USB cable is fixed to the computer by the base portion, the fastening portion, and the USB connector.
    Type: Grant
    Filed: May 8, 2001
    Date of Patent: December 10, 2002
    Assignee: NEC Corp.
    Inventor: Jun Wakino
  • Patent number: 6484005
    Abstract: An image forming apparatus having a spacer that maintains a given clearance between a cylindrical outer peripheral surface of the squeezing roller and a cylindrical outer peripheral surface of the cleaning roller.
    Type: Grant
    Filed: February 7, 2001
    Date of Patent: November 19, 2002
    Assignee: NEC Corp.
    Inventor: Keisuke Shinoda
  • Patent number: 6478834
    Abstract: By using a polishing slurry which comprises, at least, a polishing grain, an oxidizing agent and a higher-mono-primary amine, it is possible to suppress dishing and erosion liable to be produced in chemical mechanical polishing (CMP) for a copper-based metal film when forming a buried interconnection of a copper-based metal on a barrier metal film of a tantalum-based metal.
    Type: Grant
    Filed: November 20, 2001
    Date of Patent: November 12, 2002
    Assignees: NEC Corp., Tokyo Magnetic Printing Co. Ltd
    Inventors: Yasuaki Tsuchiya, Tomoko Wake, Tetsuyuki Itakura, Shin Sakurai, Kenichi Aoyagi
  • Patent number: 6477650
    Abstract: In a data secret protecting system received in a casing, a data holding memory device holds important data. A distortion detecting device detects a distortion value of the casing to produce a detected distortion value. An important data controlling device compares the detected distortion value with a reference distortion value to produce a compared distortion signal when the detected distortion value is greater than the reference distortion value. The important data controlling device erases, in response to the compared distortion signal, the important data. The data secret protecting system may comprise a temperature measuring device which measures a temperature value of the case to produce a measured temperature value. In this event, the important data controlling device corrects, in response to the measured temperature value, the detected distortion value to produce a corrected value of the detected distortion value.
    Type: Grant
    Filed: October 26, 1998
    Date of Patent: November 5, 2002
    Assignee: NEC Corp.
    Inventor: Kenichi Kokubo
  • Patent number: 6477694
    Abstract: A design support system 100 according to the present invention comprises: an LSI library 10, in which rated characteristics of various LSIs are stored by an LSI library preparation unit 70; a decoupling capacitor library 20, in which rated characteristics of various capacitors are stored; a PCB library 30, in which the cross-sectional structures of various power wiring lines are stored; a decoupling capacitor search unit 40, for employing the LSI library 10 and the decoupling capacitor library 20; a power wiring determination unit 50, for employing the results obtained by the decoupling capacitor search unit 40, the LSI library 10 and the PCB library 30; and a design results output unit 60, for outputting the results received from the power wiring determination unit 50. Furthermore, the data in the three libraries can be updated or new data can be added.
    Type: Grant
    Filed: October 27, 2000
    Date of Patent: November 5, 2002
    Assignee: NEC Corp.
    Inventors: Hitoshi Irino, Noriaki Ando, Hiroshi Wabuka, Hirokazu Tohya
  • Patent number: 6471424
    Abstract: A printer is provided, which comprises a printer body 20 including a paper sheet feeding unit for setting paper sheets therein for printing and a paper sheet discharging unit, and a printer controller 10 of the printer body 20. When setting again paper sheets after printing on one surface in the paper sheet feeding unit for printing on the other surface, the printer body 20 is adapted to print, under control of an instruction from the printer controller 10, a first symbol indicating that the paper sheets should be set in the paper sheet feeding unit with the upper, lower, left or right part of the printed surface directed in the paper sheet feed-out direction and also with the printed surface up or down.
    Type: Grant
    Filed: March 8, 2000
    Date of Patent: October 29, 2002
    Assignee: NEC Corp.
    Inventor: Takasi Hirose
  • Patent number: 6473470
    Abstract: In a phase-locked loop circuit with a signal estimator such as MLSE or DDFSE for correctly detecting and correcting a phase deviation, the phase deviation is held within a predetermined value by amplitude limiting a phase deviation signal obtained from a received signal and a replica signal. Thus, the phase deviation signal is free from a large error irrespective of generation of an estimation error in the MLSE or DDFSE.
    Type: Grant
    Filed: May 11, 1999
    Date of Patent: October 29, 2002
    Assignee: NEC Corp.
    Inventor: Hitosi Matui