Patents by Inventor Takao Umeda
Takao Umeda 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: 7873312Abstract: A transfer apparatus comprises a toner image supporting body and a corona transfer means, which are oppositely disposed, and a vibrating unit for exerting vibration force to the rear face of a toner supporting body, disposed opposite to the corona transfer means, wherein the vibrating unit has a cantilever structure for holding an end of a piezoelectric bimorph element in which a pair of piezoelectric bodies each having an electrode, are bonded to both sides of a conductive elastic member (a shim member). A protrusion portion is provided on the other end of the piezoelectric bimorph element.Type: GrantFiled: December 20, 2007Date of Patent: January 18, 2011Assignee: Ricoh Company, Ltd.Inventors: Takao Umeda, Hiroyuki Mabuchi, Shunichi Oohara
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Patent number: 7745307Abstract: In a method of manufacturing an inkjet head, a silicon dioxide (SiO2) layer is produced on the surface of first silicon member formed from single-crystal silicon. Next, a glass layer formed of borosilicate glass or the like is sputtered onto the surface of the silicon dioxide (SiO2) layer. A silicon oxide (SiOx, x<2) layer is then formed on the surface of a second silicon member. The first and second silicon members and are bonded together by applying heat at about 450° C. with heaters, as a DC voltage is applied across electrode terminals. As a result, a silicon dioxide (SiO2) layer is formed at the interface of the glass layer and silicon oxide (SiOx, x<2) layer, anodically bonding the two layers.Type: GrantFiled: July 7, 2008Date of Patent: June 29, 2010Assignee: Ricoh Printing Systems, Ltd.Inventors: Takao Umeda, Osamu Machida, Jun Nagata
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Patent number: 7651197Abstract: In a method of manufacturing an inkjet head, a silicon dioxide (SiO2) layer is produced on the surface of first silicon member formed from single-crystal silicon. Next, a glass layer formed of borosilicate glass or the like is sputtered onto the surface of the silicon dioxide (SiO2) layer. A silicon oxide (SiOx, x<2) layer is then formed on the surface of a second silicon member. The first and second silicon members and are bonded together by applying heat at about 450° C. with heaters, as a DC voltage is applied across electrode terminals. As a result, a silicon dioxide (SiO2) layer is formed at the interface of the glass layer and silicon oxide (SiOx, x<2) layer, anodically bonding the two layers.Type: GrantFiled: December 22, 2005Date of Patent: January 26, 2010Assignee: Ricoh Printing Systems, Ltd.Inventors: Takao Umeda, Osamu Machida, Jun Nagata
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Patent number: 7643779Abstract: A developer transporting amount controlling member that is used in a developing apparatus is disclosed. The developing apparatus includes a recording unit having a surface that sustains an electrostatic latent image and attracts a developer, a developer transporting unit that transports the developer, and a developing unit that guides the developer to the recording unit. The recording unit, the developer transporting unit, and the developing unit have rotational center axes that are parallel to each other. The developer transporting amount controlling member includes a magnetic part and a nonmagnetic part that is harder than the magnetic part and is fixed to the developing apparatus such that a portion of the nonmagnetic part is disposed closest to the developing unit.Type: GrantFiled: November 27, 2006Date of Patent: January 5, 2010Assignee: Ricoh Company, Ltd.Inventors: Hiroyuki Mabuchi, Takao Umeda
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Publication number: 20080293216Abstract: In a method of manufacturing an inkjet head, a silicon dioxide (SiO2) layer is produced on the surface of first silicon member formed from single-crystal silicon. Next, a glass layer formed of borosilicate glass or the like is sputtered onto the surface of the silicon dioxide (SiO2) layer. A silicon oxide (SiOx, x<2) layer is then formed on the surface of a second silicon member. The first and second silicon members and are bonded together by applying heat at about 450° C. with heaters, as a DC voltage is applied across electrode terminals. As a result, a silicon dioxide (SiO2) layer is formed at the interface of the glass layer and silicon oxide (SiOx, x<2) layer, anodically bonding the two layers.Type: ApplicationFiled: July 7, 2008Publication date: November 27, 2008Inventors: Takao Umeda, Osamu Machida, Jun Nagata
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Publication number: 20080152399Abstract: A transfer apparatus comprises a toner image supporting body and a corona transfer means, which are oppositely disposed, and a vibrating unit for exerting vibration force to the rear face of a toner supporting body, disposed opposite to the corona transfer means, wherein the vibrating unit has a cantilever structure for holding an end of a piezoelectric bimorph element in which a pair of piezoelectric bodies each having an electrode, are bonded to both sides of a conductive elastic member (a shim member). A protrusion portion is provided on the other end of the piezoelectric bimorph element.Type: ApplicationFiled: December 20, 2007Publication date: June 26, 2008Inventors: Takao Umeda, Hiroyuki Mabuchi, Shunichi Oohara
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Publication number: 20070196138Abstract: A developer transporting amount controlling member that is used in a developing apparatus is disclosed. The developing apparatus includes a recording unit having a surface that sustains an electrostatic latent image and attracts a developer, a developer transporting unit that transports the developer, and a developing unit that guides the developer to the recording unit. The recording unit, the developer transporting unit, and the developing unit have rotational center axes that are parallel to each other. The developer transporting amount controlling member includes a magnetic part and a nonmagnetic part that is harder than the magnetic part and is fixed to the developing apparatus such that a portion of the nonmagnetic part is disposed closest to the developing unit.Type: ApplicationFiled: November 27, 2006Publication date: August 23, 2007Inventors: Hiroyuki Mabuchi, Takao Umeda
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Publication number: 20060139407Abstract: In a method of manufacturing an inkjet head, a silicon dioxide (SiO2) layer is produced on the surface of first silicon member formed from single-crystal silicon. Next, a glass layer formed of borosilicate glass or the like is sputtered onto the surface of the silicon dioxide (SiO2) layer. A silicon oxide (SiOx, x<2) layer is then formed on the surface of a second silicon member. The first and second silicon members and are bonded together by applying heat at about 450° C. with heaters, as a DC voltage is applied across electrode terminals. As a result, a silicon dioxide (SiO2) layer is formed at the interface of the glass layer and silicon oxide (SiOx, x<2) layer, anodically bonding the two layers.Type: ApplicationFiled: December 22, 2005Publication date: June 29, 2006Inventors: Takao Umeda, Osamu Machida, Jun Nagata
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Patent number: 6345163Abstract: A developing device for use in an image forming apparatus has control means operatively responsive to receipt of an output signal of a first toner density detector means provided in a development unit for driving developing powder delivery means provided in a preliminary mixture/stirring unit to supply developing powder from a stirring chamber toward the development unit, while controlling regulator means so that introduction of the developing powder to the stirring chamber is inhibited at least within a developing powder refilling time period.Type: GrantFiled: September 26, 2000Date of Patent: February 5, 2002Assignee: Hitachi Koki Co. Ltd.Inventors: Katsuhiko Suzuki, Takao Umeda, Hisao Okada
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Patent number: 6330403Abstract: An image forming apparatus has an image retaining body which is supported so as to be able to move endlessly, a transfer means which is installed at a specific distance away from the surface of the image retaining body or in contact with the surface of the image retaining body, and a paper guide which is installed upstream and downstream, of or at least upstream or downstream the transfer means along the moving direction of the image retaining body for guiding a sheet of paper between the image retaining body and the transfer means and for pressing the paper onto the surface of the image retaining body. The image forming apparatus is equipped with an adjusting means for adjusting the distance between the paper guide means and the transfer means along the moving direction of the image retaining body, thereby varying the length of the paper wound onto the image retaining body.Type: GrantFiled: August 14, 2000Date of Patent: December 11, 2001Assignee: Hitachi Koki Co., Ltd.Inventors: Akio Tsujita, Takashi Rokutanda, Takao Umeda
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Patent number: 6144836Abstract: A transport roll 1 consists of a metal roll 3 of 40 mm in diameter covered with a conductive PFA tube 2 of 10.sup.10 .OMEGA.cm in volume resistivity and 200 .mu.m in thickness. A DC voltage source 4 is connected to the metal roll. A sheet of paper 5 bearing toner images 6 and 7 on both sides thereof receives a drive force from a paper drive roll, and turns with the movement of the paper. The DC voltage source produces voltage VB1 of the same polarity as the charging polarity (positive) of the toner image 6 being in contact with the transport roll. The voltage VB1 is optimumly controlled so as to prevent the transport roll from being soiled with toner.Type: GrantFiled: September 9, 1997Date of Patent: November 7, 2000Assignee: Hitachi Koki Co., Ltd.Inventors: Takao Umeda, Akio Tsujita, Takashi Rokutanda, Yukio Otome
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Patent number: 6101347Abstract: There are provided a paper separating mechanism for bringing paper into a state of non-contact with a paper carrying roll; a motor for independently driving the paper carrying roll; and a switch for changing-over the paper carrying roll driving mode between a following mode and an independent driving mode so that the driving mode is changed over to the following mode and independent driving mode at the time of printing and at the time of non-printing, respectively.Type: GrantFiled: June 3, 1999Date of Patent: August 8, 2000Assignee: Hitachi Koki Co., Ltd.Inventors: Takashi Rokutanda, Takao Umeda, Yukio Otome, Nobuyuki Mori
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Patent number: 6070032Abstract: In an electrostatic printing apparatus, the residual image phenomenon conspicuously observed at low density printing can be eliminated while photo-deterioration of the photosensitive body is being suppressed to a minimum in a high speed printing process. A charging unit, a writing light source, a developing unit, a transfer unit, a first erase lamp, an AC discharging unit and a second erase lamp are arranged around a photosensitive drum. Therein, the light intensity of the erase lamp is strengthened when the density of a printed image is light and is weakened when the density of the printed image is dark. That is, by changing the light intensity of the erase lamps corresponding to a developing bias, the residual image phenomenon can be eliminated while suppressing deterioration of the photosensitive drum to a minimum.Type: GrantFiled: June 2, 1999Date of Patent: May 30, 2000Assignee: Hitachi Koki Co., Ltd.Inventors: Takashi Rokutanda, Takao Umeda, Yukio Otome
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Patent number: 6032015Abstract: A fixing system for fixing toner images onto an image printing system such that the image printing medium bearing the toner images on the obverse side and the reverse sides thereof is passed through a nip area between a pair of fixing rollers. In the nip area, a rotation speed of a first fixing roller, which comes into contact with a not-yet fixed toner image, which is formed on the obverse side of the image printing medium, is set to be substantially equal to a rotation speed of a second fixing roller, which comes in contact with a not-yet fixed toner image, formed on the reverse side of the image printing medium. This is accomplished by setting the diameters of the various layers of the first fixing roller to be equal to that of the second fixing roller. When the image printing medium is moved through the nip area by the fixing rollers, a moving speed of the upper side of the image printing medium is equal to that of the lower side thereof.Type: GrantFiled: January 20, 1998Date of Patent: February 29, 2000Assignee: Hitachi Koki Co, Ltd.Inventors: Takao Umeda, Ryoji Kojima, Masayasu Anzai, Michio Yokosuka, Katsuhiko Suzuki, Tadahiro Kaneko
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Patent number: 5848323Abstract: In an electrostatic both-side printing system, a first image forming unit is provided upstream of an image printing medium when viewed in the transporting direction of the image printing medium, and a second image forming unit is provided downstream of the image printing medium. A medium transporting path for transporting the image printing medium is formed between the first and the second image forming units. A first transferring unit, located facing the first image forming unit with the medium transporting path intervening therebetween, for applying no charge onto the rear side of the image printing medium, which does not face the first image forming unit. A second transferring unit being located facing the second image forming unit with the image printing medium with the medium transporting path intervening therebetween, in a state that the second transferring unit is apart from a first toner image formed on the image printing medium by the first image forming unit.Type: GrantFiled: February 1, 1996Date of Patent: December 8, 1998Assignee: Hitachi Koki Co., Ltd.Inventors: Takao Umeda, Ryoji Kojima, Masayasu Anzai, Michio Yokosuka, Katsuhiko Suzuki, Tadahiro Kaneko
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Patent number: 5832333Abstract: An electrostatic recording apparatus includes a background potential detector (12a, 12b, 13a and 13b) for detecting the potential (VMc) of a background region adjacent to a normal development region (having VHc) and the potential (VMd) of a background region adjacent to a reversal development region (having VLd), and a controller (25) for controlling a charge voltage, exposure intensity, and/or developing bias voltage according to the output of the background potential detector to eliminate a fogging phenomenon.Type: GrantFiled: September 26, 1996Date of Patent: November 3, 1998Assignee: Hitachi Koki Co., Ltd.Inventors: Takao Umeda, Seiji Maruo, Hiroyuki Mabuchi
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Patent number: 5659841Abstract: An electrostatic recording control method wherein there are provided a single surface potential sensor between a first and second developer units, a detector for detecting the characteristic of a factor influencing the dark attenuation characteristic of the sensitive body, comprising the steps of: irradiating the surface of a charged sensitive body with the test pattern having prescribed exposure energy by an exposure system to form a test electrostatic image on the photosensitive body; passing the test electrostatic latent image with the developing function of the first developer unit stopping to measure the surface potential of the test electrostatic latent image by the sensor; changing the control setting potential at a position where the sensor is set according to the output from the detector; comparing the potential measured by the passing step with the control setting potential changed by the changing step to control one of the voltage to be applied to the latent image forming charger and the exposure eType: GrantFiled: December 28, 1995Date of Patent: August 19, 1997Assignee: Hitachi Koki Co., Ltd.Inventors: Takao Umeda, Hiroyuki Mabuchi, Masayasu Anzai, Shinji Asai, Kozi Kato, Yoshihiro Gunji
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Patent number: 5630201Abstract: The present invention provides a development apparatus capable of improving the development pole of a plurality of development rolls and the rotation speed thereof, thus obtaining stable printing quality. A first development roll rotatable in the opposite direction to the moving direction of photosensitive body is disposed in the upstream of it, whereas a group of second development rolls are disposed in the down stream, which development rolls are rotatable in the same direction as the moving direction of photoconductive body and have magnets of the same polarity. The first development roll and the photoconductive body define a peripheral speed ratio ranging from 0.5 to 1.5, while allowing the second development roll and the photoconductive body to define a peripheral speed ratio ranging from 0.6 to 1.5. A development control member is provided between the first development roll and the group of second development rolls.Type: GrantFiled: February 28, 1996Date of Patent: May 13, 1997Assignee: Hitachi Koki Co., Ltd.Inventors: Katsuhiko Suzuki, Takao Umeda, Masayasu Anzai
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Patent number: 5623331Abstract: A fixing unit includes a fixing roller, a pressure roller forming a nipper in cooperation with said fixing roller, the nipper conveying a recording material on which an unfixed image is formed while nipping the recording material, a recording material pressing roller disposed at least one of upstream and downstream of said nipper in a recording material conveyance direction for pressing said recording material toward the fixing roller to form a region where the recording material is wound around the fixing roller, and a tension applying unit for applying tension to the recording material.Type: GrantFiled: May 26, 1995Date of Patent: April 22, 1997Assignees: Hitachi Koki Co., Ltd., Hitachi Ltd.Inventors: Tadahiro Kaneko, Takao Umeda, Tsutomu Maekawa, Teruaki Mitsuya
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Patent number: 5600405Abstract: A bias cleaning system has an electrically conductive brush roller for collecting toner which has to adhered a transfer belt by scrubbing the toner off the transfer belt under a condition in which a direct current voltage of the opposite polarity to the charge of the toner is applied to the brush roller. A corona charger is also provided for decreasing the amount of charge on the toner on the transfer belt in a region of the belt up-stream of the electrically conductive brush roller in the moving direction of the transfer belt.Type: GrantFiled: June 9, 1994Date of Patent: February 4, 1997Assignee: Hitachi, Ltd.Inventors: Takao Umeda, Katsuya Kawai, Yosuke Saito, Hiroyuki Mabuchi, Masayasu Anzai, Masato Miwa, Takashi Suzuki, Teruaki Mitsuya, Yasuo Takuma