Patents by Inventor Tomoaki Yokoyama

Tomoaki 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).

  • Publication number: 20200206904
    Abstract: A robot of one aspect includes a first base configuring a trunk portion, a second base configuring a head region, a connecting mechanism that connects the first base and the second base, and a drive unit that drives the connecting mechanism. The drive unit includes motors disposed on the first base. The connecting mechanism includes linking mechanisms that are disposed in parallel to each other and are driven by the motors respectively. Each linking mechanism includes a drive link fixed to a rotary shaft of the motor and a driven link that is connected to the drive link via a first joint and connected to the second base via a second joint. The first joint is a single axis hinge joint, and the second joint is a universal joint.
    Type: Application
    Filed: March 13, 2020
    Publication date: July 2, 2020
    Inventors: Tomoaki YOKOYAMA, Kaname HAYASHI
  • Patent number: 9688153
    Abstract: An electric vehicle includes: an engine which is disposed on a front side in the vehicle, and which is configured to drive rear wheels of the vehicle, the engine which includes a crank shaft that is extended in a front/back direction of the vehicle; and a drive motor which is arranged in line with the engine in a width direction of the vehicle, and which is disposed on an air intake side of the engine, the drive motor which is configured to drive front wheels of the vehicle.
    Type: Grant
    Filed: June 12, 2015
    Date of Patent: June 27, 2017
    Assignees: MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA, MITSUBISHI JIDOSHA ENGINEERING KABUSHIKI KAISHA
    Inventors: Takuya Yamamoto, Hidetoshi Ono, Eiji Akita, Naoki Kida, Tomoaki Yokoyama
  • Publication number: 20150360572
    Abstract: An electric vehicle includes: an engine which is disposed on a front side in the vehicle, and which is configured to drive rear wheels of the vehicle, the engine which includes a crank shaft that is extended in a front/back direction of the vehicle; and a drive motor which is arranged in line with the engine in a width direction of the vehicle, and which is disposed on an air intake side of the engine, the drive motor which is configured to drive front wheels of the vehicle.
    Type: Application
    Filed: June 12, 2015
    Publication date: December 17, 2015
    Applicants: MITSUBISHI JIDOSHA ENGINEERING KABUSHIKI KAISHA, MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA
    Inventors: Takuya YAMAMOTO, Hidetoshi ONO, Eiji AKITA, Naoki KIDA, Tomoaki YOKOYAMA
  • Publication number: 20040111417
    Abstract: A first computer system designates a search condition, requesting a second computer system to retrieve records that satisfy the search condition from a database. The second computer system retrieves all records that satisfy the search condition from the database, sending the contents thereof to the first computer system. The first computer system executes preset data manipulations on a memory to the database object, which corresponds to contents of the retrieved records, recording the contents of the data manipulations into the memory as a log by a record. The first computer system stores the contents of the database object and the log after the data manipulation into a massage, sending it to the second computer system when all preset data manipulations to the database object are completed. The second computer system accesses the database according to the log in the received massage to reflect the database object to the database.
    Type: Application
    Filed: August 22, 2003
    Publication date: June 10, 2004
    Applicant: FUJITSU LIMITED
    Inventors: Hisasi Goto, Shigeru Makita, Tomoaki Yokoyama
  • Patent number: 5491541
    Abstract: The present invention is characterized in that two magnetic poles of a magnetic member which are positioned to confront a nipping region between a sleeve and a photoreceptor in neighboring relation with each other are of the same polarity. These neighboring poles of the same polarity produce a distribution of magnetic flux density having first and second local maximum points and a local minimum point therebetween. A central angle .theta.1 between a line extending from a center of the magnetic member to the first local maximum point and a line extending the center to the local minimum point is smaller than a central angle .theta.2 between the line extending from the center to the local minimum point and a line extending from the center to the second local maximum point. Further, a developer material retained by the magnetic force of attraction generated by the neighboring magnetic poles of same polarity are kept in contact with the electorostatic latent image bearing member.
    Type: Grant
    Filed: November 10, 1993
    Date of Patent: February 13, 1996
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Tomoaki Yokoyama, Makoto Takase
  • Patent number: 5442425
    Abstract: A twin magnetic pole type developing apparatus of the present invention includes a rotatable sleeve enclosing a non-rotatable magnetic member therein. The magnetic member has two magnetic poles of the same polarity which are positioned so as to confront a developing region in neighboring relation with each other. Developer material to be used is a two-component type developer material consisting of toner particles and carrier particles. Especially, the carrier particles have an average particle size of 25 .mu.m or more and are capable of being magnetized to an intensity of magnetization of 30 emu/g or more. Further, a packing density in the developing region ranges from 5% to 40%. Consequently, the developer material can contact with an electrostatic latent image formed on a photoreceptor to develop it into the image of high density.
    Type: Grant
    Filed: January 25, 1994
    Date of Patent: August 15, 1995
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Tomoaki Yokoyama, Makoto Takase
  • Patent number: 5283615
    Abstract: An image forming apparatus is provided with an optical system for forming a first electrostatic latent image and a second electrostatic latent image on a rotatable photosensitive member, a first developing device accommodating a first developer for developing the first electrostatic latent image, and a second developing device accommodating a second developer for developing the second electrostatic latent image. The second developing device is located downstream from the first developing device in a direction of rotation of the photosensitive member and is provided with a developing roller having a magnetic force. The second developer differs in color from the first developer and has a magnetism greater than the first developer. The second developer is transported to the second electrostatic latent image along a periphery of the developing roller.
    Type: Grant
    Filed: October 11, 1990
    Date of Patent: February 1, 1994
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Tomoaki Yokoyama, Tateki Oka, Kunio Toda
  • Patent number: 5122843
    Abstract: An image forming apparatus includes an image support member; a first electrostatic latent image forming device for forming a first electrostatic latent image on the image support member; a first developing device for developing the first electrostatic latent image with first toner; a second electrostatic latent image forming device for forming a second electrostatic latent image on the image support member; and a second developing device for developing the second electrostatic latent image with second toner; the second toner having a color different from that of the first toner and having charging characteristics relative to carrier, identical with those of the first toner; the second toner having an average particle diameter larger than that of the first toner.
    Type: Grant
    Filed: February 13, 1991
    Date of Patent: June 16, 1992
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Tomoaki Yokoyama, Tateki Oka, Kunio Toda
  • Patent number: 5063127
    Abstract: A first electrostatic latent image on an image bearer is developed with a first toner in a first developing unit, and a second electrostatic latent image thereon is developed with a second toner in a second developing unit, wherein the first toner is transmittable to the image bearer at a lower bias voltage than the second toner, and wherein the second toner and a foreign first toner mixed in the second developing unit are chargeable to the same polarity by friction with a carrier contained in the second developing unit; the second developing unit is put into operation for a non-image forming portion of the image bearer by applying a voltage thereto wherein the voltage is maintained higher than the surface potential of the non-image forming portion so as to enable the foreign first toner to adhere thereto.
    Type: Grant
    Filed: November 21, 1989
    Date of Patent: November 5, 1991
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Tateki Oka, Tomoaki Yokoyama
  • Patent number: 5040023
    Abstract: A device for replenishing a developing device with a toner is disclosed, which device is for use in electrophotographic image forming equipment such as a copying machine or a printer. The replenishment of the developing device with the toner is executed when the toner concentration in the developer held in the developing device decreases below a prescribed reference concentration. Otherwise, this replenishment is effected supplementarily when the ratio of the dark part to the bright part of the image on a given document to be printed exceeds a prescribed reference value and, at the same time, the equipment is set for a copying mode in which the toner is consumed quickly. This mode consists in causing the copying action to be performed continuously, allowing the copying operation to be performed on copying papers of a size larger than a prescribed reference size, or reproducing an image in a high density.
    Type: Grant
    Filed: September 13, 1989
    Date of Patent: August 13, 1991
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventor: Tomoaki Yokoyama
  • Patent number: 5038176
    Abstract: An image forming apparatus having plural developing devices, comprising: a photosensitive member arranged rotatably in one direction and holding an electrostatic latent image corresponding to an original image; a developing sleeve rotatably arranged in each developing device at a position confronting said photosensitive member to transport a developer; a device for simultaneously driving for rotation of each of said developing sleeves in said developing devices; and an adjusting mechanism for adjusting operation of said developing devices so that in a region where said developing sleeves confront with said photosensitive member, a developer packaged density (F) in said developing device arranged at an upstream side in a rotational direction of said member is larger than that of said developing device arranged at a downstream side in the rotational direction of said member, which isF=Vd/Ds,where Vd is an amount of the developer passing between said developing sleeve and said photosensitive member per hour, and
    Type: Grant
    Filed: June 6, 1989
    Date of Patent: August 6, 1991
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Tomoaki Yokoyama, Kunio Toda, Taisuke Nagao
  • Patent number: 5036369
    Abstract: An image forming apparatus includes a photosensitive member rotatably supported; an upstream developing device, in a rotary direction of the member, for developing an electrostatic latent image corresponding to a solid image and/or a literal image with an accommodated developer therein; a downstream developing device, in the direction thereof, for developing an electrostatic latent image corresponding to a line image with an accommodated developer in the same color as that in the upstream developing device; a cleaning device for collecting the developer remained on the surface of the member; and a developer transporting device for transporting the developer collected by the cleaning device to the upstream developing device.
    Type: Grant
    Filed: June 29, 1989
    Date of Patent: July 30, 1991
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Kunio Toda, Tomoaki Yokoyama, Taisuke Nagao
  • Patent number: 5012285
    Abstract: A developing apparatus includes a photosensitive drum positioned in confronting relation to a developing sleeve. A toner accommodating tank is provided for supplying toner to the developing sleeve. The toner accommodating tank is divided into a small chamber and a supplementary chamber which are separated from one another by a partition which permits toner to be supplied from the supplementary chamber to the small chamber but which prevents the return of toner from the small chamber to the supplementary. A movable shutter selectively permits and prevents toner from being supplied from the supplementary chamber to the small chamber in accordance with operation of the apparatus.
    Type: Grant
    Filed: May 6, 1988
    Date of Patent: April 30, 1991
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Tateki Oka, Naoki Toyoshi, Tomoaki Yokoyama, Hiroshi Mizuno, Hiroshi Murasaki, Akihito Ikegawa, Kouichi Etou, Shuichi Nakagawa
  • Patent number: 5006893
    Abstract: When an image forming process is a prescribed process consuming toner rapidly, the toner is supplied at any time besides the normal toner supply timing. Therefore, the toner is supplied frequently, the period of normal toner supply timing in which a large amount of toner is supplied becomes longer, and the toner is well mixed with the developer. When the image forming process is a prescribed process consuming toner rapidly, the period of determining toner concentration is made shorter. Consequently, the number of toner replenishment is increased, and the fluctuation of the toner concentration in the developer becomes small.
    Type: Grant
    Filed: December 16, 1988
    Date of Patent: April 9, 1991
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventor: Tomoaki Yokoyama
  • Patent number: 4924270
    Abstract: A toner supply device including a hopper for containing the toner; a toner supply roller rotatably disposed below the hopper so as to fill an opening formed in a lower section of the hopper; a charging blade which is disposed so as to be in close contact under pressure with the toner supply roller to electrically charge the toner which is transported on the toner supply roller; a toner scraping mechanism having a toner scraping blade arranged at a position located downstream to the charging blade with respect to a rotational direction of the toner supply; a sensor for detecting the toner density; and a control unit for controlling the toner scraping mechanism depending on signals from the sensor so as to make the toner scraping blade move to one of a first position at which it comes in close contact under pressure with the toner supply roller and a second position at which the blade stands apart from the toner supply roller.
    Type: Grant
    Filed: October 27, 1988
    Date of Patent: May 8, 1990
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Mineyuki Sako, Tateki Oka, Yasuyuki Hiromoto, Tomoaki Yokoyama, Kunio Toda
  • Patent number: 4917043
    Abstract: A developing device in an image forming apparatus which having a developing sleeve disposed in face-to-face relationship with a photoreceptor drum, a magnetic roller disposed inside the developing sleeve for forming a magnetic brush of developing material on an outer peripheral surface of the developing sleeve for the developing of a latent image on the photoreceptor drum, and a casing enclosing the developing sleeve and having a portion which is held in contact with the magnetic brush. Portions of the casing are formed of or with a toner adherence preventive material of a type capable of being charged to the same polarity as that of the toner particles when held in frictional contact with the material used to charge the toner particles.
    Type: Grant
    Filed: September 20, 1988
    Date of Patent: April 17, 1990
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventor: Tomoaki Yokoyama
  • Patent number: 4912513
    Abstract: A copying apparatus in which a developing bias voltage to be applied to a developing sleeve by a power source is changed to adjust the density of a reproduced image, while the electric potential difference between the developing sleeve and a toner supply roller is kept constant. As a result, a density of toner on the developing sleeve is kept constant. Therefore, a development is effected under the condition in which the density of the toner is constant, so that the tone of the image of an original document is reproduced in a desired density.
    Type: Grant
    Filed: July 1, 1988
    Date of Patent: March 27, 1990
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Tateki Oka, Naoki Toyoshi, Tomoaki Yokoyama
  • Patent number: 4897331
    Abstract: By utilizing an electrophotographic image forming process, a reversal image can be obtained in the following manner:charging a photosensitive member;forming an electrostatic latent image in a charged surface of the photosensitive member;developing the electrostatic latent image formed on the photosensitive member by using white toner;charging the photosensitive member again;developing the surface of the photosensitive member by using other toner different in color from the white toner; andtransferring the toner image formed on the photosensitive member onto a paper sheet.
    Type: Grant
    Filed: June 2, 1988
    Date of Patent: January 30, 1990
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Naoki Toyoshi, Hiroshi Okamoto, Kenji Tabuchi, Kaoru Takebe, Tomoaki Yokoyama
  • Patent number: 4891287
    Abstract: An image editing method utilizing an electrophotographic process, which method includes a first charging step of charging a photosensitive medium; a step of projecting an image onto the charged photosensitive medium to form an electrostatic latent image; a first developing step of developing the electrostatic latent image into a first powder image by the use of a first toner material having the same polarity as the charged polarity; a first transferring step of transferring the powder image onto a copying paper; a second charging step of again charging the photosensitive medium to a polarity the same as that of the charge established during the first charging step; a step of radiating rays of light to the charged photosensitive medium to remove the electrostatic charge at a specificed area of the photosensitive medium; a second developing step of developing the specified area of the photosensitive medium by the use of a second toner material different in color from the first toner material to form a second po
    Type: Grant
    Filed: June 2, 1988
    Date of Patent: January 2, 1990
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Naoki Toyoshi, Hiroshi Okamoto, Kenji Tabuchi, Kaoru Takebe, Tomoaki Yokoyama
  • Patent number: 4835566
    Abstract: A first developing device is provided in a demountable manner near a photoconductor drum of an electrophotographic copying apparatus. There is further provided a second developing device most downstream along a direction of rotation of the photoconductor drum. Developer containing color toner is stored in the first developing device and developer containing black toner is stored in the second developing device. An outline image forming unit for forming an outline image can be installed in place of the first developing device. When the first developing device is installed, development of a copy image is effected by either the first developing device or the second developing device. When the outline image forming unit is installed in place of the first developing device, an outline image formed by the outline image forming unit is developed by the second developing device.
    Type: Grant
    Filed: November 12, 1987
    Date of Patent: May 30, 1989
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Tateki Oka, Naoki Toyoshi, Tomoaki Yokoyama