Patents by Inventor Keiichi Tokuyama
Keiichi Tokuyama has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11938983Abstract: A train position estimation device which calculates the position of a vehicle traveling on a predetermined path and comprises a surroundings shape measurement unit that is installed in the vehicle and measures the shape of the surroundings of the current location of the vehicle and a map storage unit for storing surroundings shape data at positions measured in advance, the train position estimation device being characterized by comprising a start position estimation unit for storing the probability of presence of the vehicle at each position; a map retrieval section determination device for outputting surroundings shape data for each position in descending order of presence probability; and a matching processing device that compares the surroundings shape data for the current location with the retrieved surroundings shape data and outputs the position for which the difference therebetween is equal to or less than a predetermined threshold value.Type: GrantFiled: January 28, 2019Date of Patent: March 26, 2024Assignee: HITACHI, LTD.Inventors: Yuhi Tsutsumi, Atsushi Oda, Keiichi Katsuta, Kazuo Tokuyama
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Patent number: 5031479Abstract: There are disclosed an automatic gear change control apparatus for an automobile and a method of controlling such apparatus. A rotational output of an internal combustion engine is connected to drive wheels of the automobile and a load device. When a gear shifting-up of an automatic transmission is to be effected, the load applied by the load device is increased, or the load is connected to an output rotation shaft of the engine via a selectively-connecting device, thereby reducing the rotational speed of the output rotation shaft of the engine to a required level.Type: GrantFiled: June 4, 1990Date of Patent: July 16, 1991Assignee: Hitachi, Ltd.Inventors: Masahiko Ibamoto, Keiichi Tokuyama, Hiroyuki Ohiwa, Hiroshi Kimura, Mitsuhiro Masuda
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Patent number: 4752771Abstract: In a color liquid crystal type electronic instrument panel, the quantity of light to be radiated from a background light source is changed in accordance with a color to be displayed. The color liquid crystal type electronic instrument panel is of the type that a plurality of plural-primary-color stripe filters are disposed on each segment of a display element in the longitudinal direction of the segment; a voltage is applied to electrodes corresponding to the stripe filters having a color selected based on the contents to be displayed, and the background light source is positioned at the back of the display element to enable color-displaying. A device for detecting the brightness of outdoor light is further provided in the liquid crystal display type electronic instrument panel, wherein the quantity of light to be radiated from the background light source is changed in accordance with a detected signal by the detecting device.Type: GrantFiled: August 22, 1985Date of Patent: June 21, 1988Assignee: Hitachi, Ltd.Inventors: Kouzou Katogi, Osamu Igarashi, Keiichi Tokuyama, Hirohisa Yamamura, Seiji Suda
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Patent number: 4736198Abstract: A liquid crystal display panel including transparent electrode pairs confronting each other with liquid crystal substance disposed therebetween. At least one of each electrode pair is split into thin line electrode strips with color filters of several kinds of color being disposed thereon or on corresponding positions on the opposite electrode. The panel produces a display in an arbitrary color through the application of a certain combination of color signals between the electrodes selectively.Type: GrantFiled: May 28, 1985Date of Patent: April 5, 1988Assignee: Hitachi, Ltd.Inventors: Keiichi Tokuyama, Seiji Suda, Osamu Igarashi, Hirohisa Yamamura, Kouzo Katogi, Hiroshi Ito, Masaru Kugo, Kazuhiko Sato
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Patent number: 4708440Abstract: In a segment display type multi-color liquid crystal display device, the area of the display surface of the display device except the areas of segment electrodes is formed so as to present a color identical or similar to a color presented by the segment electrodes in an unselected state. Selected segments can be clearly recognized.Type: GrantFiled: February 18, 1986Date of Patent: November 24, 1987Assignee: Hitachi, Ltd.Inventors: Masaru Kugo, Hideyuki Ouchi, Kouzou Katogi, Osamu Igarashi, Seiji Suda, Keiichi Tokuyama, Hirohisa Yamamura
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Patent number: 4700303Abstract: An apparatus for adjusting height of a motor vehicle have functions of detecting abnormality of sensors for detecting the vehicle height, driving a compressor independent of outputs of the sensors when pressure within a suspension is lower than a predetermined value, enabling actuation of the compressor after lapse of a predetermined time since turning-on of an ignition switch, enabling decreasing of the vehicle height for a predetermined time after turning-off of the ignition switch, and a self-diagnosing function for preventing runaway of the control.Type: GrantFiled: April 19, 1985Date of Patent: October 13, 1987Assignee: Hitachi, Ltd.Inventors: Keiichi Tokuyama, Mitsuhiro Masuda, Osamu Igarashi, Taiji Hasegawa
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Patent number: 4649381Abstract: A liquid crystal panel device comprises a liquid crystal panel having a relatively large area particularly while in use with an automobile dashboard and having a plurality of display sections, a diffusion plate disposed opposing the rear face of the liquid crystal panel for diffusing receiving light rays, a printed circuit board disposed opposing the rear face of the diffusion plate, and a plurality of light emitting members disposed in equally spaced relation to each other on the printed circuit board over the whole region of the liquid crystal panel. A reflection plate is provided between the diffusion plate and the board, and a partition plate corresponding to the display section of the liquid crystal panel is provided. Within a space defined by the diffusion plate, board, reflection plate, and partition plate, the light emitting members consisting of three or four incandescent lamps are disposed.Type: GrantFiled: October 25, 1984Date of Patent: March 10, 1987Assignee: Hitachi, Ltd.Inventors: Mitsuhiro Masuda, Osamu Igarashi, Keiichi Tokuyama, Kozo Katogi
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Patent number: 4635034Abstract: A display apparatus for a vehicle comprising arithmetic unit for processing outputs of different sensors in accordance with a given process program so as to provide display signals adapted to be displayed on different display units, a memory for storing predetermined process programs corresponding to different display standards, and a program selecting device for selecting one of the process programs stored in the memory in accordance with a desired one of the display standards and supplying the selected process program to the arithmetic unit, whereby the display units can display signals to meet any one of the different display standards.Type: GrantFiled: May 11, 1983Date of Patent: January 6, 1987Assignee: Hitachi, Ltd.Inventors: Keiichi Tokuyama, Shotaro Naito, Mitsuhiro Masuda
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Patent number: 4630840Abstract: A vehicle height adjusting device comprises a vehicle height sensor for sensing the height of a vehicle, means for controlling the vehicle height which produces a vehicle height adjusting signal in response to the signal from the vehicle height sensor, driving means for adjusting the vehicle height in response to the vehicle height adjusting signal, constant voltage conversion means for converting a power supply voltage into a constant voltage and supplying the constant voltage to the means for controlling the vehicle height, and power supply control means for on-off controlling the supply of the power supply voltage in accordance with the turn-on and turn-off of an ignition switch.Type: GrantFiled: December 5, 1985Date of Patent: December 23, 1986Assignee: Hitachi, Ltd.Inventors: Mitsuhiro Masuda, Osamu Igarashi, Keiichi Tokuyama
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Patent number: 4564905Abstract: A vehicle trip computer for detecting the distance traveled by a vehicle and the amount of fuel remaining in the fuel tank and computing and displaying the capable travel distance of the vehicle through the desired computational operations in accordance with the detected data. During the initial period following the connection of the trip computer to the power source, the capable travel distance of the vehicle is computed by using a predetermined initial gas mileage in place of the computed gas mileage. Also, the trip computer does not replace the initial gas mileage with the computed actual gas mileage until the distance traveled by the vehicle exceeds a predetermined distance.Type: GrantFiled: June 17, 1983Date of Patent: January 14, 1986Assignee: Hitachi, Ltd.Inventors: Mitsuhiro Masuda, Shotaro Naito, Keiichi Tokuyama, Shizuhisa Watanabe
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Patent number: 4553196Abstract: Herein disclosed is a vehicular power source system which uses as its load a memory-arithmetic circuit (5) such as a microcomputer.An electric power is supplied to the load (5) through a diode (6) and a constant voltage circuit (4), when a switch (2) for running the vehicle is open, but a booster (3) is operated to supply the power when the switch (2) is turned on.The voltage drop of a battery (1), which may be caused during the running operation of the vehicle, is not transmitted to the load (5), but a constant voltage is supplied to the load (5) at all times so that the storage data of the memory unit (5) is always held.Type: GrantFiled: February 1, 1983Date of Patent: November 12, 1985Assignee: Hitachi, Ltd.Inventors: Keiichi Tokuyama, Shotaro Naito, Shizuhisa Watanabe
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Patent number: 4398260Abstract: A skid control device employs a wheel speed sensor and the control circuit which includes a microcomputer. The microcomputer computes wheel speed on the basis of a pulse signal derived from the wheel speed sensor and delivers a break releasing signal when the wheels slip. A brake control apparatus for controlling the pressure of oil for applying the brakes to the wheels responds to the outputs of the microcomputer. The microcomputer contains a free-running counter which counts clock pulses and a memory containing a sequence of storage locations. This sequence of storage locations stores count values of the free-running counter. A pulse signal from the wheel speed sensor is employed to produce an interrupt request for the microcomputer. The contents of successively adjacent locations in memory are employed by the microcomputer for carrying out the necessary calculations and computing wheel speed.Type: GrantFiled: May 8, 1980Date of Patent: August 9, 1983Assignee: Hitachi, Ltd.Inventors: Junichi Takahashi, Takanori Shibata, Shotaro Naito, Keiichi Tokuyama