Patents Assigned to Mitsubishi Denki K.K.
  • Patent number: 7471344
    Abstract: An image display apparatus has a control circuit that periodically varies a characteristic, such as an amplitude characteristic or timing characteristic, of the displayed image signal. Periodic variations may be produced by passing the image signal through a variable inductance element, for example, or by alternately selecting two amplifier circuits with different gain characteristics, or by periodically delaying the image signal. The periodic variations reduce peaks in the spectrum of unintended radiation emissions, and suppress undesired moire patterns in the displayed image.
    Type: Grant
    Filed: February 7, 2000
    Date of Patent: December 30, 2008
    Assignee: Mitsubishi Denki K.K.
    Inventor: Toshitsugu Wakabayashi
  • Patent number: 7365902
    Abstract: An optical amplifier includes a plurality of pump light sources, an intensity modulator that modulates intensity of a pump light to be output from any one of the pump light sources, at a predetermined frequency; a photoelectric converter that converts a part of the wavelength-division multiplexed signal light Raman-amplified by the pump light to electrical signals; a gain modulation signal detector that extracts a gain modulation signal having a component of the frequency from the electrical signals; and a controller that controls only the intensity of pump lights that are output from the pump light source, of which intensity is modulated at the frequency to control Raman amplification gain so that an amplitude of the gain modulation signal becomes a predetermined value. The intensities of pump lights output from individual pump light sources are sequentially controlled to obtain a predetermined value of the Raman amplification gain.
    Type: Grant
    Filed: April 3, 2003
    Date of Patent: April 29, 2008
    Assignee: Mitsubishi Denki K.K.
    Inventor: Kunihiko Isshiki
  • Patent number: 7227953
    Abstract: A copy-protected-state indicating MPEG-TS data output unit (3) holds a bit stream obtained by previously compressing and encoding image and/or audio data representing that recording desired by the user has ended in failure because the contents is copy-protected. When copy control information (V2) outputted from an IEEE 1394 interface (1) indicates a copy-protected state, a selecting unit (20) selects copy-protected-state indicating MPEG-TS data (V3) outputted from the copy-protected-state indicating MPEG-TS data output unit (3) and outputs it as to-be-recorded MPEG-TS data (V4). Thereby, the data (V3) is recorded.
    Type: Grant
    Filed: May 10, 2002
    Date of Patent: June 5, 2007
    Assignee: Mitsubishi Denki K.K.
    Inventor: Tetsuro Shida
  • Patent number: 6441333
    Abstract: A green compact electrode for discharge surface treatment used for discharge surface treatment for generating discharge between a work and a green compact electrode obtained by pressuring and compacting a metal powder or a powder of a compound metal, and using the discharge energy forming a coating of an electrode material or a substance obtained through a reaction of the electrode material with the discharge energy on the work surface; the electrode is obtained by mixing a soft metal powder as a bonding agent with the metal powder or the compound metal powder, and pressuring and compacting the mixed powder.
    Type: Grant
    Filed: August 15, 2000
    Date of Patent: August 27, 2002
    Assignee: Mitsubishi Denki K.K.
    Inventors: Akihiro Goto, Toshio Moro
  • Patent number: 6400530
    Abstract: A method for manufacturing a magnetic head core of a complex magnetic head includes binding a first core material of a U-shaped cross section and a second core material of a flat plate shape to form a tubular core material having two bonded portions between the first and second core materials. Then a plurality of grooves are formed in the tubular core material across one of the bonded portions to form a plurality of track surfaces. The grooves are then filled with a fused glass material, and the other of the bonded portions is removed to form a substantially U-shaped core block having a plurality of track surfaces separated by the glass-filled grooves. The U-shaped core block is then sliced along each of the grooves to obtain a plurality of magnetic head cores. A complex magnetic head manufactured by the method is also disclosed.
    Type: Grant
    Filed: June 4, 1999
    Date of Patent: June 4, 2002
    Assignee: Mitsubishi Denki K.K.
    Inventors: Hirofumi Ouchi, Toshihisa Obuse, Yoshio Kasuga, Tatsunori Hibara, Masao Kouhashi, Kouichi Yamada, Seiichi Handa, Hiromasa Ishii, Seiichi Watanabe
  • Patent number: 6377890
    Abstract: Route guiding information is displayed on the basis of set information and positional data when set information and positional data are set by a keyboard or are transmitted from a sensor BOX 12.
    Type: Grant
    Filed: July 10, 2000
    Date of Patent: April 23, 2002
    Assignee: Mitsubishi Denki K.K.
    Inventor: Katsuji Doi
  • Patent number: 6259989
    Abstract: The present invention is a navigation device comprising a map data base which stores map data relating to each target geographical point and a display data base which distinguishes between named intersections and general roads and expressways at the geographical point and stores display data for display. The attributes of roads entering the target intersection at the target geographical point are determined, display data stored in the display data base corresponding to the attributes of the determined roads are acquired and named intersections at the target geographical point are displayed based on acquired display data. In this way, it is easy for the user to understand named intersections of the expressway.
    Type: Grant
    Filed: September 23, 1999
    Date of Patent: July 10, 2001
    Assignee: Mitsubishi Denki K.K.
    Inventor: Toshiki Kusama
  • Patent number: 5404418
    Abstract: A closed-loop feedback control system is disclosed for controlling an operation of a load. An actual operation signal is subtracted from a reference operation signal to produce a resultant signal which is used to control the operation of the load. A filter unit, such as a notch filter, operates to suppress any machine resonance frequencies found in the operation signal due to load fluctuations, machine variations, operating environment changes, deterioration with age, etc. A filter coefficient of the filter unit is adjusted so that any fluctuation in the resonance frequency can be suppressed effectively.
    Type: Grant
    Filed: July 31, 1991
    Date of Patent: April 4, 1995
    Assignee: Mitsubishi Denki K.K.
    Inventor: Tetsuaki Nagano
  • Patent number: 5386421
    Abstract: In the conventional image memory diagnosis, diagnosis data is written in the image memory for a comparison between the data read out of the image memory and the diagnosis data. All the address and control signals for the image memory are output by the system. By contrast, according to the invention, the display control signal output by the CRT controller is converted into address and control signals for the image memory, thus not only increasing the process speed but also reducing the system load.
    Type: Grant
    Filed: March 16, 1994
    Date of Patent: January 31, 1995
    Assignee: Mitsubishi Denki K.K.
    Inventor: Yasuo Ishikawa
  • Patent number: 5373826
    Abstract: An ignition apparatus for an internal combustion engine having a current limiting function is simple in construction and can avoid variations In the current limiting values for respective power transistors 103. A current limiting circuit 109 includes a common resistor 105 connected at one end thereof to a power supply 101 and at the other end thereof to a plurality of ignition voltage generating circuits 104. an operational amplifier 107 making a comparison between a voltage V.sub.105 across the resistor 105 and a reference voltage Vr which corresponds to a predetermined upper limit current for each power transistor 103 and generating an output signal A of a magnitude proportional to a difference (V.sub.105 -Vr) therebetween, and a plurality of transistors 108 provided one for each power transistor 103 and connected to receive the output signal A from the operational amplifier 107 for limiting a current through a corresponding power transistor 103 in response to the output signal A.
    Type: Grant
    Filed: February 17, 1993
    Date of Patent: December 20, 1994
    Assignee: Mitsubishi Denki K.K.
    Inventors: Masaaki Taruya, Mitsuru Koiwa
  • Patent number: 5336954
    Abstract: A drain unit of a starter is a cover of resin material which covers a drain hole of the under surface of said starter. The cover is provided with a plurality of upward projections which are inserted and fixed to the drain hole by the spring function of a fixing hook formed at the top end of each upward projection. A drain outlet is positioned of a horizontal distance from the drain hole, and a water preventing wall defines a labyrinthial construction between the drain hole position and the drain outlet.
    Type: Grant
    Filed: December 24, 1991
    Date of Patent: August 9, 1994
    Assignee: Mitsubishi Denki K.K.
    Inventor: Shigeru Shiroyama
  • Patent number: 5306998
    Abstract: A protection control circuit for a variable speed hoisting device driven by an induction motor includes, in addition to the inverter unit 1 for supplying power to the induction motor 2 and relays, a rotary encoder 16 and an abnormality detector 15. When the rotary encoder 16 does not generate output in spite of the fact that an operation instruction is input, the abnormality detector 15 opens the normally closed contact 15b2 to stop the inverter unit 1 and turns on the invertor abnormality display lamp 15d1 and rotation detector abnormality display lamp 15d2.
    Type: Grant
    Filed: August 25, 1992
    Date of Patent: April 26, 1994
    Assignee: Mitsubishi Denki K.K.
    Inventor: Youji Nakamura
  • Patent number: 5301546
    Abstract: In a misfire detecting device for an internal combustion engine, a crank angle detector detects the crank angle of the engine, a speed detector detects the speed of the engine from the crank angle thus detected, a load detector detects the load of the engine from the speed thus detected; and a misfire detector detects the misfire rate of the engine from the load thus detected, and outputs a misfire detection signal when the misfire rate thus detected exceeds a misfire rate determining value set according to a certain amount of load.
    Type: Grant
    Filed: February 12, 1992
    Date of Patent: April 12, 1994
    Assignee: Mitsubishi Denki K.K.
    Inventors: Masanori Inada, Akira Demizu, Akihiro Nakagawa
  • Patent number: 5293500
    Abstract: A parallel processor is provided with a plurality of independently operable command units and a plurality of function units each connected to the command unit. A data unit, a register file, and a carry bit are shared such that the command and function units operate in parallel without any conflict. A priority scoreboard is provided to control the register file so that the command units operate independently according to the parallelism of a program, and detect and avoid a contention for a register according to the order of priority, making simultaneous execution of a plurality of commands possible, resulting in the increased process speed.
    Type: Grant
    Filed: May 27, 1993
    Date of Patent: March 8, 1994
    Assignee: Mitsubishi Denki K.K.
    Inventors: Hitoshi Ishida, Shigeyuki Kazama, Minoru Shiga
  • Patent number: 5285378
    Abstract: An apparatus for and method of automatically tuning control parameters of a servo or spindle drive system controlled by a numerical control unit is disclosed. The numerical control unit employs an automatic tuning device that automatically selects a tuning program and test run program associated with a selected control parameter. The tuning device test runs the servo or spindle according to the test run program selected and changes and controls the status value data measured in accordance with the control parameter selected. The invention also relates to a method of changing a criterion for the feature values of a control parameter, a method of comprehensively determining the feature values where there are a plurality of tuning conditions, and a method of sampling the status value data of the servo or spindle.
    Type: Grant
    Filed: March 30, 1992
    Date of Patent: February 8, 1994
    Assignee: Mitsubishi Denki K.K.
    Inventor: Kouki Matsumoto
  • Patent number: 5285354
    Abstract: A controller base unit for a DIN-standard installation wherein a molded base is provided with an internal chassis for support and a contour that permits the direct and releasable attachment of the unit to a DIN rail via a plurality of hooks that are simultaneously moveable between an engaged and non-engaged position. The base is provided with a recess in a planar face thereof for accommodating a printed circuit board and has fixed tabs along the periphery of the recess. The circuit board has cut-outs that mate with the tabs for insertion of the board into the recess and is slidable laterally into a position where the tabs secure the board against the surface of the recess and a screw or the like can secure the board against further lateral movement. The board has at both ends thereof a pair of connectors that are connectable with either end of a separate similarly designed board via a cable.
    Type: Grant
    Filed: February 21, 1992
    Date of Patent: February 8, 1994
    Assignee: Mitsubishi Denki K.K.
    Inventors: Osamu Ohsawa, Noboru Takahashi
  • Patent number: 5281940
    Abstract: A solenoid coil bobbin of the present invention for an electromagnetic switch which has a lead wire part of a coil being provided with projections an outer circumference walls adjacent to a pair grooves to be included the lead wire in the opening therebetween, each top end of the projections further having a swollen portion which protrudes in some length from a shape of a hall of the rigid iron core to be inserted the lead wire part therein, so that the swollen portion closes the opening of the lead wire part when inserting the lead wire part in the hall.
    Type: Grant
    Filed: March 30, 1992
    Date of Patent: January 25, 1994
    Assignee: Mitsubishi Denki K.K.
    Inventor: Takeo Goto
  • Patent number: 5281791
    Abstract: A pulsed arc welding for carrying out arc welding or short-circuit transfer type arc welding by utilizing the pulsed discharge generated at the tip of a wire electrode. The propensity of wire electrode curvature causes irregular changes in the contact point of the wire electrode and variations in the arc length between the wire electrode tip and workpieces. Consequently, the invention detects arc voltage and current and checks the instantaneous variation in the arc length. The arc voltage value thus detected is converted to a reference arc voltage variable. Then the detected arc voltage value is compared with the reference value to compute a true arc length. A simulation arc length signal, which varies as welding proceeds, and a reference simulation welding current waveform are set, to compare the simulation arc length signal with the computed arc length signal.
    Type: Grant
    Filed: December 27, 1990
    Date of Patent: January 25, 1994
    Assignee: Mitsubishi Denki K.K.
    Inventors: Yoichiro Tabata, Shigeo Ueguri, Yoshihiro Ueda, Masanori Mizuno, Yoshiaki Katou, Osamu Nagano
  • Patent number: 5280259
    Abstract: A superconductive magnet device includes a superconductive magnet body and non-magnetic pipes made of a transparent non-magnetic material. Preferably, the magnetic shims for compensating for the inhomogeneous magnetic field components generated by the superconductive magnet body are colored in accordance with the kinds thereof. Thus, during the adjustment operation of the inhomogeneous magnetic field, the number, kinds, and the position of the magnetic shims within the non-magnetic pipes can be ascertained from without.
    Type: Grant
    Filed: November 13, 1991
    Date of Patent: January 18, 1994
    Assignee: Mitsubishi Denki K.K.
    Inventors: Toshiki Idemaru, Tatuya Oue, Naoji Yoshida
  • Patent number: 5280569
    Abstract: A three-dimensional model displaying method of displaying on a display screen a three-dimensional model expressed in a computer in the field of CAD or CAM. The quadrangular patches of the upper interface of a three-dimensional model is approximated with rectangular regions along the x-axis and y-axis of a two-dimensional coordinate system on the display screen. Accordingly, it is unnecessary to perform the operation of painting quadrangles irregular in configuration, and therefore the patch painting process can be achieved at high speed and with high accuracy.
    Type: Grant
    Filed: January 10, 1991
    Date of Patent: January 18, 1994
    Assignee: Mitsubishi Denki K.K.
    Inventor: Yoshinori Tsujido