Patents by Inventor Yasumori Nagahara

Yasumori Nagahara 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).

  • Patent number: 7110700
    Abstract: A belt driving controller includes a driving roller having a radius r1, a plurality of driven rollers that is driven by rotation of the driving roller, the driven rollers having a radius r2, an endless belt that is wound on the driving roller and the driven rollers and an encoder that is attached to one of the driven rollers, and that outputs a signal. The rotation of the driving roller is controlled based on the signal from the encoder, and (?2/?1)×(r1/r2)?1 is satisfied where ?1 is a correction coefficient for a fluctuation in thickness of the endless belt caused by a belt winding angle on the driving roller, and ?2 is a correction coefficient for a fluctuation in the thickness on the driven roller.
    Type: Grant
    Filed: August 27, 2004
    Date of Patent: September 19, 2006
    Assignee: Ricoh Company, Limited
    Inventors: Toshiyuki Andoh, Yasumori Nagahara, Tadashi Shinohara, Yuuji Matsuda, Kazuhiko Kobayashi, Nobuto Yokokawa, Masato Yokoyama, Yohhei Miura, Toshiyuki Takahashi, Jun Hosokawa
  • Publication number: 20050085945
    Abstract: A belt driving controller includes a driving roller having a radius r1, a plurality of driven rollers that is driven by rotation of the driving roller, the driven rollers having a radius r2, an endless belt that is wound on the driving roller and the driven rollers and an encoder that is attached to one of the driven rollers, and that outputs a signal. The rotation of the driving roller is controlled based on the signal from the encoder, and (?2/?1)×(r1/r2)?1 is satisfied where ?1 is a correction coefficient for a fluctuation in thickness of the endless belt caused by a belt winding angle on the driving roller, and ?2 is a correction coefficient for a fluctuation in the thickness on the driven roller.
    Type: Application
    Filed: August 27, 2004
    Publication date: April 21, 2005
    Inventors: Toshiyuki Andoh, Yasumori Nagahara, Tadashi Shinohara, Yuuji Matsuda, Kazuhiko Kobayashi, Nobuto Yokokawa, Masato Yokoyama, Yohhei Miura, Toshiyuki Takahashi, Jun Hosokawa
  • Patent number: 5646749
    Abstract: A color image forming apparatus is provided with a printer controller which is capable of receiving color image data for one page, which is divided into a plurality of data for each of a corresponding plurality of colors, at an irregular interval, and, upon receiving the image data for one color, driving an image forming device to form an image of the color whose data has been received, and after images of all of the plurality of colors are completed, outputting the final image on a recording media. The image forming device may also include, an intermediate image transfer belt for forming thereupon an image of each of the plurality of colors, superposing one on another, and a leading edge detect sensor to detect a leading edge of an image of each of the plurality of colors for registering the leading edges of images of the plurality of colors.
    Type: Grant
    Filed: March 19, 1996
    Date of Patent: July 8, 1997
    Assignee: Ricoh Company, Ltd.
    Inventors: Kyoji Omi, Yasumori Nagahara
  • Patent number: 4951160
    Abstract: An image forming apparatus includes a fixing speed setting unit for selectively setting the fixing speed in accordance with a desired mode of operation, a fixing unit for fixing a reproduced image of an original formed on a image forming medium at a variable fixing speed in accordance with the fixing speed setting unit, and a scanning unit provided with opto-electrical elements arranged in one line extended laterally to a predetermined scanning direction for optically receving an image of the original through the opto-electrical elements. The opto-electrical elements are carrying out a scanning operation in the predetermined scanning direction with varied scanning speed by changing a sweep spacing of an image data with averaging every N line of the image data in accordance with the operation mode with using every N-1 lines of the image data to reproduce the image of the original on the image forming medium.
    Type: Grant
    Filed: July 3, 1989
    Date of Patent: August 21, 1990
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasumori Nagahara, Kenichirou Asada, Takanobu Fujioka, Yoshiaki Kanmoto, Mitsuo Hasebe, Kiyoto Nagasawa, Akio Katsumata, Setsuo Soga
  • Patent number: 4421405
    Abstract: A multiple mode copying apparatus including a drive for moving a lens in the direction of a principal light beam, a conversion cam for converting the distance covered by the movement of a lens into a rotational angle, and a mirror moving device for moving mirrors in accordance with the rotational angle. The conversion cam is formed with a first cam surface for deciding the distance to be covered by the movement of the mirrors and a second cam surface for following up the distance covered by the movement of the lens. The second cam surface is profiled such that it is in the form of an arc such that when a cam follower moves past a point of contact of the cam follower for effecting copying without magnification and reduction, the direction movement of the cam member is reversed by starting at the point of contact thereof. By selecting a suitable profile for the second cam surface, it is possible to have the first cam surface profiled to be in the form of a straight line.
    Type: Grant
    Filed: May 26, 1982
    Date of Patent: December 20, 1983
    Assignee: Ricoh Company, Ltd.
    Inventor: Yasumori Nagahara
  • Patent number: 4350750
    Abstract: Either a single copy or a plurality of copies of an original document may be made. Making a single copy or the last copy of a plurality of copies comprises, during a first revolution of a photoconductive drum, electrostatically charging the drum, radiating a light image of the document onto the drum to form an electrostatic image, developing the electrostatic image using a magnetic brush to form a toner image, transferring the toner image to a copy sheet, electrostatically discharging the drum and uniformly radiating the drum with light to further discharge the same. During a second revolution of the drum the drum is cleaned with the same magnetic brush to remove residual toner, and again electrostatically discharged and uniformly radiated. During a third revolution of the drum the magnetic brush is again used for cleaning.
    Type: Grant
    Filed: August 14, 1980
    Date of Patent: September 21, 1982
    Assignee: Ricoh Company, Ltd.
    Inventors: Shigeru Suzuki, Minoru Suzuki, Koichi Suzuki, Kyoji Omi, Yasumori Nagahara, Yoshiharu Kagari, Makoto Hashimoto, Goro Mori
  • Patent number: 4299475
    Abstract: In a variable magnification copying machines capable of performing slit exposure of the image of original document to the surface of a photoconductor with a desired magnification by moving a contact glass on which the original document is placed or an optical system in synchronization with the photoconductor which is moved at a predetermined constant speed, a scanning method and apparatus in which the moving speed of the optical system or of the contact glass at the exposure step and the moving speed of the same at the returning step to the original position thereof are made variable depending upon a selected magnification of the copy of the original document, and the moving speed of the optical system or of the contact glass is set in such a manner that the sum of the time required for the optical system or the contact glass to move for exposure scanning and the time required for the optical system or the contact glass to return to the home position thereof is constant regardless of the selected magnificatio
    Type: Grant
    Filed: March 12, 1980
    Date of Patent: November 10, 1981
    Assignee: Ricoh Company, Ltd.
    Inventor: Yasumori Nagahara
  • Patent number: 4297021
    Abstract: The powder material transportation apparatus for transporting powder materials such as developer powder, by a rotating member such as a coil is provided with an agitator for destroying a bridge of powder material which is apt to be formed in an upper portion of the rotating member. The diameter or pitch of a rotating coil member is designed to be greater in a transportation termination portion than in a transportation initiation portion, whereby the powder material transportation force is increased in the transportation termination portion and formation of the bridge of powder material is prevented.
    Type: Grant
    Filed: June 6, 1979
    Date of Patent: October 27, 1981
    Assignee: Ricoh Company, Ltd.
    Inventors: Tatsuo Tani, Yasumori Nagahara, Sakae Ohta, Minoru Suzuki, Kiyozo Hashizume
  • Patent number: 4231653
    Abstract: An oil supply apparatus for use with copying machines comprises a tank for holding an offset preventing oil therein, a pump for sucking the oil from the tank, a container for holding the sucked oil therein, an oil application device for applying the oil taken from the container to an image fixing roller and an oil recovery means device for recovering an excessive amount of the oil which was taken from the container and returning it to the tank. The oil is always circulated in the oil supply apparatus and the container can be detached from the tank. When the container is detached from the tank, a stopper is engaged in a drain hole formed in the container concurrently with the detachment action so as to prevent the oil from being spilled.
    Type: Grant
    Filed: November 28, 1978
    Date of Patent: November 4, 1980
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasumori Nagahara, Haruki Iida
  • Patent number: 4045134
    Abstract: A photosensitive member for use in an electrophotographic apparatus in which a bias potential is applied to the member during development. The member comprises a conductive support having at least one support edge and a photosensitive layer formed on the surface of the support and extending up to a point substantially coincident with the support edge. A tapered surface is formed at the extremity of the photosensitive layer adjacent to each support edge which extends from the top of the photosensitive layer to the support edge. The maximum angle between a tangent of the tapered surface and the surface of the conductive support is less then 45.degree. thereby preventing an edge effect by which a background smearing in the form of a black band may appear on copied paper obtained. Such a tapered surface can be easily formed through a vaporizing technique with a special masking in accordance with the present invention.
    Type: Grant
    Filed: March 1, 1976
    Date of Patent: August 30, 1977
    Assignee: Ricoh Company, Ltd.
    Inventors: Shigeru Suzuki, Yasumori Nagahara, Koji Sakamoto, Katsuo Sakai
  • Patent number: 3997790
    Abstract: The apparatus is for heat-fixing a toner image onto a support sheet in which the fixing of toner image is effected through both infrared radiation and direct contact with a heated surface of fixing roller in succession. An endless belt, having a transparency for infrared and trained over a pair of rollers, is disposed within a heat insulating casing, an upper run of the belt defining a path of movement of a toner image bearing support sheet to be fixed. An infrared radiator is disposed beneath the upper run of belt while a reflecting plate is disposed at the opposite side of the belt from the radiator with respect to the path. A fixing roller is disposed downstream of the radiator along the path for completing the fixing.
    Type: Grant
    Filed: July 8, 1975
    Date of Patent: December 14, 1976
    Assignee: Ricoh Co., Ltd.
    Inventors: Shigeru Suzuki, Yasumori Nagahara, Koichi Suzuki
  • Patent number: 3970383
    Abstract: An apparatus for color electrophotography including optical scanning means which moves intermediate a stationary original document and a copy sheet for scanning the colored image on the document onto, and a drum-shaped photoreceptor which is rotated in synchronism with the scanning movement of said scanning means. Successive images are scanned through different color filters to form successive electrostatic latent images thereon which are successively transferred from the rotating photoreceptor onto a stationary copy sheet. Each electrostatic image is successively developed using developer of a color corresponding to that of the filter used during the preceding scan before the following scan.
    Type: Grant
    Filed: November 14, 1974
    Date of Patent: July 20, 1976
    Assignee: Ricoh Co., Ltd.
    Inventors: Saburo Honda, Kyoji Kunitomo, Yasumori Nagahara
  • Patent number: 3941472
    Abstract: An electrically insulated minor portion is provided on the periphery of a photosensitive drum comprising a cylindrical supporter, a photoconductive strip wound in roll form on a supply reel disposed in the interior of the cylindrical supporter and paid out thereof to apply a portion thereof to a major portion of the outer periphery of the cylindrical supporter so that the portion may serve as a photoreceptor on which an electrostatic latent image of an original to be copied is formed. The strip portion on the outer periphery is withdrawn and wound on a take-up reel that is also disposed in the interior of the cylindrical supporter. The minor portion of the outer periphery of the cylindrical supporter has on its surface an electrically insulating layer with electrical resistance in the range of 1 to 5 .times. 10.sup.9 .OMEGA.cm, the layer consisting of a material which is not charged by frictional contact with either the magnetic developing brush or the cleaning brush.
    Type: Grant
    Filed: August 17, 1973
    Date of Patent: March 2, 1976
    Assignee: Ricoh Co., Ltd.
    Inventors: Yasumori Nagahara, Kohji Suzuki