Patents by Inventor Eiji Yokoyama
Eiji Yokoyama 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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Publication number: 20240116736Abstract: A position measuring unit detects a present position of a car. A point-of-origin detecting unit detects a passage of the car at a point-of-origin position which is separated by a distance set in advance from a landing position of the car. Each of pattern generating units generates a run pattern based on mutually different algorithms. In each run pattern, an acceleration from before the car passes the point-of-origin position until the car stops is continuous. A pattern selecting unit selects a run pattern which minimizes a landing time as a run pattern which a run control unit causes a run of the car to follow based on a present position. The pattern selecting unit makes the selection based on a speed of the car at a timing when the car passes the point-of-origin position.Type: ApplicationFiled: April 12, 2021Publication date: April 11, 2024Applicant: Mitsubishi Electric CorporationInventors: Eiji YOKOYAMA, Hidetaka ISHIGURO, Hiroyuki ENOKIJIMA
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Patent number: 11940347Abstract: A pressure sensor has a stem in which a pressure introduction hole into which a pressure medium is introduced and a diaphragm deformable according to the pressure of the pressure medium are formed, and a strain detecting element which is arranged on the diaphragm via an insulating film and being configured to output a detection signal according to the deformation of the diaphragm. The strain detecting element is configured to have a portion made of polysilicon. A low doping layer having a higher electrical resistivity than polysilicon and a higher crystallinity than the insulating film is arranged between the insulating film and the strain detecting element.Type: GrantFiled: October 22, 2021Date of Patent: March 26, 2024Assignees: DENSO CORPORATION, NAGANO KEIKI CO., LTD.Inventors: Hiroshi Kodama, Naoki Yoshida, Kaori Miyashita, Eiji Takeda, Nobuaki Yamada, Yoshihiro Tomomatsu, Yasushi Yanagisawa, Yusuke Midorikawa, Shirou Kamanaru, Kenichi Yokoyama, Inao Toyoda, Hisayuki Takeuchi, Naohisa Niimi, Masao Takahashi, Yasutake Ura, Kouji Asano, Yukihiro Kamada
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Publication number: 20240034594Abstract: An elevator device includes: a car which travels through a hoistway; a code tape suspended in the hoistway; a code read sensor which reads a code described in the code tape; a code tape elongation/contraction detection unit which detects an amount of elongation or contraction of the code tape; a reference marker which is installed in the hoistway and which indicates a reference position of the car; a reference sensor which is installed in the car and which detects the reference marker; and a control unit which, when a condition based on the amount of elongation or contraction is satisfied, moves the car to the reference position in accordance with a detection result of the reference sensor, causes position information of the car to be read as reference position information, calculates compensatory position information based on the reference position information, and controls the car using the compensatory position information.Type: ApplicationFiled: October 21, 2020Publication date: February 1, 2024Applicant: Mitsubishi Electric CorporationInventors: Takuo KUGIYA, Masayuki KAKIO, Eiji YOKOYAMA, Hidetaka ISHIGURO
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Patent number: 11586231Abstract: A reaction compensation device includes a drive mechanism driving a first movable part with respect to a base, a reaction mass drive mechanism driving a second movable part with respect to the base; and a first relative position sensor measuring a relative position between the first movable part and the base. There is also a second relative position sensor measuring a relative position between the second movable part and the base, a first control system controlling the drive mechanism by taking in a signal outputted from the first relative position sensor as a feedback signal in response to a command value, and a second control system correcting the command value using a correction parameter for adjusting a difference between mass properties of the drive mechanism and reaction mass drive mechanism and for controlling the reaction mass drive mechanism.Type: GrantFiled: December 26, 2017Date of Patent: February 21, 2023Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Osamu Takahara, Eiji Yokoyama, Kazuhide Kodeki
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Publication number: 20220185506Abstract: A formation flight control device for generating and outputting orbit control information for controlling observation satellites in an observation satellite group orbiting a celestial body and sequentially observing a ground surface of the celestial body with an observation interval includes an orbit information acquirer, an orbit control information generator, and an orbit control information outputter. The orbit information acquirer acquires orbit information indicating an observation time of a preceding observation satellite of which an observation order precedes by one, and an orbit of the preceding observation satellite at the observation time.Type: ApplicationFiled: May 14, 2019Publication date: June 16, 2022Applicant: Mitsubishi Electric CorporationInventors: Masanori KAWAMURA, Osamu TAKAHARA, Eiji YOKOYAMA
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Publication number: 20220135367Abstract: Proposed is an elevator control device in which an unbalance torque estimation unit configured to estimate an unbalance torque in a motor is implemented in accordance with such a new finding that the unbalance torque can be estimated based on a first time period from an output change of a brake state command signal for switching an operation state of a brake from a braking state to a releasing state to a time when the motor starts a rotating operation along with release of the brake, and on a positive or negative sign of a velocity signal obtained when the motor starts rotation. As a result, as compared to the related art, a smaller calculation load can be achieved. Further, the elevator control device can have a sufficient responsiveness for suppressing an influence of the unbalance torque.Type: ApplicationFiled: March 29, 2019Publication date: May 5, 2022Applicant: Mitsubishi Electric CorporationInventors: Tetsuya KIMURA, Eiji YOKOYAMA, Toshiyuki BABA, Yasushi OTSUKA
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Publication number: 20210269278Abstract: Provided is an elevator control device that can control uncomfortable vibration in a car by using simple calculation. The elevator control device includes, in an elevator in which the car and a counter weight are supported by a main rope wound around a sheave of a motor, a car speed instruction value generator that generates a car speed instruction value with respect to the car; a motor speed controller that controls a motor drive circuit that controls rotation of the motor, based on a motor speed instruction value; and a car vibration control calculator that outputs to the motor speed controller the motor speed instruction value having, relative to the car speed instruction value, a reduced component of a vibration frequency of vibration generated in the car.Type: ApplicationFiled: September 25, 2018Publication date: September 2, 2021Applicant: Mitsubishi Electric CorporationInventors: Kazufumi HIRABAYASHI, Hidetaka ISHIGURO, Eiji YOKOYAMA, Hiroyuki SEKIGUCHI
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Patent number: 11101760Abstract: Provided is an electric motor control device including: a speed controller configured to calculate an operation amount directed to an electric motor, and output the operation amount; a first filter configured to use the operation amount as an input to calculate a first correction amount in accordance with a first transfer function from the operation amount to the first correction amount, and output the first correction amount; a second filter configured to use a rotational speed as an input to calculate a second correction amount in accordance with the second transfer function from the rotational speed to the second correction amount, and output the second correction amount; and a control command calculator configured to add the first correction amount and the second correction amount to one another, to thereby calculate a control command, and output the control command.Type: GrantFiled: December 20, 2017Date of Patent: August 24, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Tetsuya Kimura, Yasushi Otsuka, Eiji Yokoyama
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Publication number: 20210194402Abstract: Provided is an electric motor control device including: a speed controller configured to calculate an operation amount directed to an electric motor, and output the operation amount; a first filter configured to use the operation amount as an input to calculate a first correction amount in accordance with a first transfer function from the operation amount to the first correction amount, and output the first correction amount; a second filter configured to use a rotational speed as an input to calculate a second correction amount in accordance with the second transfer function from the rotational speed to the second correction amount, and output the second correction amount; and a control command calculator configured to add the first correction amount and the second correction amount to one another, to thereby calculate a control command, and output the control command.Type: ApplicationFiled: December 20, 2017Publication date: June 24, 2021Applicant: Mitsubishi Electric CorporationInventors: Tetsuya KIMURA, Yasushi OTSUKA, Eiji YOKOYAMA
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Publication number: 20210141404Abstract: A reaction compensation device includes a drive mechanism driving a first movable part with respect to a base, a reaction mass drive mechanism driving a second movable part with respect to the base; and a first relative position sensor measuring a relative position between the first movable part and the base. There is also a second relative position sensor measuring a relative position between the second movable part and the base, a first control system controlling the drive mechanism by taking in a signal outputted from the first relative position sensor as a feedback signal in response to a command value, and a second control system correcting the command value using a correction parameter for adjusting a difference between mass properties of the drive mechanism and reaction mass drive mechanism and for controlling the reaction mass drive mechanism.Type: ApplicationFiled: December 26, 2017Publication date: May 13, 2021Applicant: Mitsubishi Electric CorporationInventors: Osamu TAKAHARA, Eiji YOKOYAMA, Kazuhide KODEKI
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Patent number: 10495281Abstract: A projection optical instrument includes a light source unit, a projection optical member and a support part. The light source unit emits light. The projection optical member transforms the light emitted from the light source unit into projection light. The support part supports the projection optical member to be movable with respect to the light source unit in at least one direction orthogonal to an optical axis direction of the light source unit. When vibration is applied to at least one of the light source unit and the projection optical member, the projection optical member accordingly vibrates with respect to the light source unit in a direction orthogonal to the optical axis direction of the light source unit.Type: GrantFiled: November 4, 2016Date of Patent: December 3, 2019Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Mitsuhiro Yamazumi, Atsushi Michimori, Eiji Yokoyama
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Publication number: 20190301700Abstract: A projection optical instrument includes a light source unit, a projection optical member and a support part. The light source unit emits light. The projection optical member transforms the light emitted from the light source unit into projection light. The support part supports the projection optical member to be movable with respect to the light source unit in at least one direction orthogonal to an optical axis direction of the light source unit. When vibration is applied to at least one of the light source unit and the projection optical member, the projection optical member accordingly vibrates with respect to the light source unit in a direction orthogonal to the optical axis direction of the light source unit.Type: ApplicationFiled: November 4, 2016Publication date: October 3, 2019Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Mitsuhiro YAMAZUMI, Atsushi MICHIMORI, Eiji YOKOYAMA
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Patent number: 8879143Abstract: A screen includes a light diffusion layer in which microcapsules, each having therein a light diffusion liquid that scatters light for displaying a video image, are planarly arranged. The light diffusion layer is fixed to a supporting sheet by a binder material. On a surface of the supporting sheet, a Fresnel lens is formed. A light diffusion plate is made up of the light diffusion layer and the supporting sheet. The screen is made up of the light diffusion plate and a light diffusion plate. Scattering distribution of a scattered wave of light that passes through the light diffusion layer temporally changes.Type: GrantFiled: December 8, 2010Date of Patent: November 4, 2014Assignee: Mitsubishi Electric CorporationInventors: Satoru Okagaki, Eiji Yokoyama, Tomohiro Sasagawa, Jun Kondo, Muneharu Kuwata, Kuniko Kojima, Yuzo Nakano
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Patent number: 8827457Abstract: A projector includes: a plurality of reflection-type light modulation device which modulate a plurality of color light fluxes according to image information; a plurality of reflection-type polarizing plate; a color combining device; a projection lens that projects the combined color light from the color combining device; and a light-transmissive member that transmits a color light flux incident thereon, wherein the light-transmissive member is disposed only in an optical path between a first reflection-type polarizing plate, which is one of the plurality of reflection-type polarizing plate, and the color combining device.Type: GrantFiled: January 19, 2011Date of Patent: September 9, 2014Assignee: Seiko Epson CorporationInventors: Eiji Yokoyama, Shinichi Wakabayashi
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Patent number: 8675145Abstract: A projector includes: a reflection-type polarizing plate which separates entering luminous flux by polarization into first linearly polarized light and second linearly polarized light whose polarization directions cross each other at right angles; a reflection-type light modulation device disposed inclined to the reflection-type polarizing plate to modulate the first linearly polarized light separated by polarization by the reflection-type polarizing plate according to image information and emit the modulated first linearly polarized light toward the reflection-type polarizing plate; a supporting body which supports the reflection-type polarizing plate and the reflection-type light modulation device; and a light shielding member disposed in an area to emit side of the second linearly polarized light which entering the reflection-type polarizing plate before modulation by the reflection-type light modulation device and separated by polarization, and connected with the supporting body.Type: GrantFiled: December 20, 2010Date of Patent: March 18, 2014Assignee: Seiko Epson CorporationInventors: Shinichi Wakabayashi, Eiji Yokoyama
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Patent number: 8390951Abstract: As a measure against vibration caused by disturbance due to mass eccentricity of a disc, a conventional disc device has a means to add an auxiliary mass that passively operates. This method has no way to enhance vibration damping effect other than setting the auxiliary mass to be large, and therefore there is a problem that the device becomes large. An auxiliary mass 300 is actively driven by an auxiliary mass driving portion 360. The driving of the auxiliary mass 300 is performed by amplifying a signal corresponding to a force transmitted from a main frame portion 100 to the auxiliary mass 300. This achieves a vibration damping effect using the small auxiliary mass 300 to the same degree as that where the large auxiliary mass is mounted.Type: GrantFiled: September 15, 2010Date of Patent: March 5, 2013Assignee: Mitsubishi Electric CorporationInventor: Eiji Yokoyama
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Publication number: 20120224109Abstract: A screen includes a light diffusion layer in which microcapsules, each having therein a light diffusion liquid that scatters light for displaying a video image, are planarly arranged. The light diffusion layer is fixed to a supporting sheet by a binder material. On a surface of the supporting sheet, a Fresnel lens is formed. A light diffusion plate is made up of the light diffusion layer and the supporting sheet. The screen is made up of the light diffusion plate and a light diffusion plate. Scattering distribution of a scattered wave of light that passes through the light diffusion layer temporally changes.Type: ApplicationFiled: December 8, 2010Publication date: September 6, 2012Inventors: Satoru Okagaki, Eiji Yokoyama, Tomohiro Sasagawa, Jun Kondo, Muneharu Kuwata, Kuniko Kojima, Yuzo Nakano
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Publication number: 20120155243Abstract: As a measure against vibration caused by disturbance due to mass eccentricity of a disc, a conventional disc device has a means to add an auxiliary mass that passively operates. This method has no way to enhance vibration damping effect other than setting the auxiliary mass to be large, and therefore there is a problem that the device becomes large. An auxiliary mass 300 is actively driven by an auxiliary mass driving portion 360. The driving of the auxiliary mass 300 is performed by amplifying a signal corresponding to a force transmitted from a main frame portion 100 to the auxiliary mass 300. This achieves a vibration damping effect using the small auxiliary mass 300 to the same degree as that where the large auxiliary mass is mounted.Type: ApplicationFiled: September 15, 2010Publication date: June 21, 2012Inventor: Eiji Yokoyama
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Patent number: 8149665Abstract: Means (101a) for evaluating positional control deviation and means (102a) for outputting a corrective signal, this being a set of signals with kick and brake functions, to an actuator (10) on the basis of the evaluation result are provided. Although control deviation may increase due to external shock or vibration acting on the disc device or when a disc having eccentricity, wobble, or another physical deformity is reproduced, the control deviation is suppressed without loss of control stability, and stable recording and reproducing is always possible.Type: GrantFiled: September 5, 2007Date of Patent: April 3, 2012Assignee: Mitsubishi Electric CorporationInventor: Eiji Yokoyama
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Publication number: 20110181799Abstract: A projector includes: a reflection-type polarizing plate which separates entering luminous flux by polarization into first linearly polarized light and second linearly polarized light whose polarization directions cross each other at right angles; a reflection-type light modulation device disposed inclined to the reflection-type polarizing plate to modulate the first linearly polarized light separated by polarization by the reflection-type polarizing plate according to image information and emit the modulated first linearly polarized light toward the reflection-type polarizing plate; a supporting body which supports the reflection-type polarizing plate and the reflection-type light modulation device; and a light shielding member disposed in an area to emit side of the second linearly polarized light which entering the reflection-type polarizing plate before modulation by the reflection-type light modulation device and separated by polarization, and connected with the supporting body.Type: ApplicationFiled: December 20, 2010Publication date: July 28, 2011Applicant: SEIKO EPSON CORPORATIONInventors: Shinichi WAKABAYASHI, Eiji YOKOYAMA