Patents by Inventor Hiroyoshi Funato

Hiroyoshi Funato 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: 5031978
    Abstract: A recording optical system includes a semiconductor laser for emitting a light beam and a shutter device for changing the spot size of the light beam. The shutter device has a shutter array in which a plurality of shutter elements are arranged in a line, each of the shutter elements being controlled so as to be opened and shut in accordance with a gradational image. The recording optical system also has a deflection optical system for deflecting the light beam which passes through the shutter device and an image formation optical system for focusing the light beam which is deflected by the deflection optical system on a recording medium, so that the light beam scans the recording medium to form the image.
    Type: Grant
    Filed: August 16, 1990
    Date of Patent: July 16, 1991
    Assignee: Ricoh Company, Ltd.
    Inventors: Takashi Shibaguchi, Hiroyoshi Funato
  • Patent number: 4987299
    Abstract: A rotation quantity measuring method and system measures a rotation quantity of an object body. The rotation quantity is measured by irradiating a light from a light source on a grating pattern which is formed on a peripheral surface of a cylindrical body which rotates integrally with the object body, and detecting a shadow picture pattern which is generated by a reflected light received from the grating pattern based on a diffraction caused by the grating pattern. Then, the rotation quantity of the object body is measured based on a movement of the shadow picture pattern as the object body rotates.
    Type: Grant
    Filed: August 23, 1989
    Date of Patent: January 22, 1991
    Assignees: Ricoh Company, Ltd., Hiroshi Kobayashi, Haruhiko Machida
    Inventors: Hiroshi Kobayashi, Haruhiko Machida, Jun Akedo, Hiroyoshi Funato
  • Patent number: 4971414
    Abstract: An optical information record/read apparatus comprises a light source for emitting light, a converging optical system for converging the emitted light from the light source on the optical record medium so that the converged light is reflected by the optical record medium, and an optical waveguide element having a waveguide layer. A light coupling system is provided for coupling the reflected light from the optical record medium with the waveguide layer so that the light coupled with the waveguide layer is then propagated, as a guided light, within the waveguide layer. At least a part of the light coupling system is integrally formed with the optical waveguide element. A light detecting system for detecting the guided light propagated within the waveguide layer is integrally formed with the optical waveguide element.
    Type: Grant
    Filed: June 16, 1989
    Date of Patent: November 20, 1990
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroyoshi Funato, Shigeyoshi Misawa
  • Patent number: 4876680
    Abstract: An optical pick-up for use in an optically information recording and reproducing apparatus is provided. The pick-up includes a substrate on which an optical waveguide layer is formed and a grating coupler is formed on the optical waveguide layer. Photosensors are also provided to receive light travelling along the waveguide from the grating coupler. A beam splitter is also formed on the substrate for splitting the light from the grating coupler into two separate light beams before reception by the photosensors. If the substrate is opaque, the substrate is formed with an opening through which light emitted from a light source passes. An objective lens is also provided for focusing the light emitted from the light source onto the information recording surface of an optical disc. A quarter wavelength plate may also be provided to change the nature of polarization of the light used.
    Type: Grant
    Filed: September 4, 1987
    Date of Patent: October 24, 1989
    Assignee: Ricoh Company, Ltd.
    Inventors: Shigeyoshi Misawa, Hiroyoshi Funato
  • Patent number: 4761046
    Abstract: A plurality of laser beams are applied to a scanning medium at different positions thereon and are converted thereby to respective scanning light beams. The laser beams are modulated by color image signals representative of respective differently colored images. As the scanning medium rotates, it deflects the applied laser beams and emits them as the scanning light beams. The scanning light beams are then applied to respective photosensitive bodies to scan them, forming latent images thereon which correspond to the color image signals, respectively. The latent images are developed into respective color images which are transferred and fixed to a single recording medium thereby to form a color image thereon.
    Type: Grant
    Filed: April 18, 1986
    Date of Patent: August 2, 1988
    Assignee: Ricoh Company, Ltd.
    Inventor: Hiroyoshi Funato
  • Patent number: 4712852
    Abstract: A hologram disk for deflecting a light beam in a hologram scanner includes a plurality of straight-line gratings formed by holograms in an annular pattern for deflecting the light beam. The line-to-line distance d.theta. between adjacent lines of each of said straight-line gratings is determined to meet, at least approximately, the following equation when said each straight-line grating is rotated through an angle .theta.R: ##EQU1## where .lambda. is the wavelength of the light beam and .alpha. is a proportionality constant. Therefore, the angle .theta.s through which the light beam is deflected is expressed by .theta.s=.alpha..multidot..theta.R.
    Type: Grant
    Filed: June 3, 1986
    Date of Patent: December 15, 1987
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroyoshi Funato, Nobuo Banba
  • Patent number: 4678263
    Abstract: A photo scanner device including a rotary disk having a plurality of holograms thereon and arranged in at least two concentric circles with respect to the axis of rotation of the disk, and a light source which generates a beam of light which is incident on the disk at a selected radial distance which may be varied so as to illuminate the holograms arranged on a selected concentric circle. The holograms on the same concentric circle each subtend the same angle from the axis, and the holograms on different concentric circles subtend different angles from the axis, thereby permitting the angle of scan to be switched by selection of the radial distance at which the beam of light is incident.
    Type: Grant
    Filed: October 21, 1985
    Date of Patent: July 7, 1987
    Assignee: Ricoh Company, Ltd.
    Inventor: Hiroyoshi Funato
  • Patent number: 4637679
    Abstract: In a laser printer or the like, for the purpose of increasing a recording speed, the number of revolutions of a laser beam deflector is not increased but a plurality of scanning lines are simultaneously scanned. To this end, a plurality of laser beams with an angle of incidence slightly varied are simultaneously incident upon one and the same laser beam deflector. In the event that places for installation of a plurality of light sources are hindered each other by other light sources, light sources different in polarization surface from each other are used, and when beams are combined by means of a polarization beam combiner, a combined beam which is different in angle of emergence through a fine angle each other can be obtained without loss of light.
    Type: Grant
    Filed: July 12, 1983
    Date of Patent: January 20, 1987
    Assignee: Ricoh Company, Ltd.
    Inventor: Hiroyoshi Funato
  • Patent number: 4623791
    Abstract: An optical scanning device includes a grating disc for deflection which is provided with linear diffraction gratings in an annular arrangement and adapted to deflect a laser beam to optically scan a given plane by means of the deflected laser beam. The laser beam incident to the grating disc has an elliptical section in its incident position on the grating disc. The longer axis of the elliptical section extends in the radial direction of the grating disc.
    Type: Grant
    Filed: February 14, 1985
    Date of Patent: November 18, 1986
    Assignee: Ricoh Company, Ltd.
    Inventors: Yutaka Kaneko, Hiroyoshi Funato
  • Patent number: 4505537
    Abstract: The present invention provides a light scanning apparatus including a semiconductor laser as its light source, a hologram disk having a plurality of equidistant linear gratings of hologram arranged in the form of a circle, which is driven to rotate at constant speed in a predetermined direction, a first optical system for leading the light from the laser to be incident upon one of the gratings, and a second optical system for leading the light diffracted by said one grating to a scanning surface. In one aspect, the second optical system is so structured to maintain the scanning surface to be in conjugate relation in geometric optics with the surface of said one grating thereby allowing to keep the scan line at a desired position even if the oscillation wavelength of the light varies. In another aspect, the incident angle of the light into the one grating is varied in accordance with the oscillation wavelength of the light so as to maintain a constant diffracted angle.
    Type: Grant
    Filed: June 23, 1983
    Date of Patent: March 19, 1985
    Assignee: Ricoh Company, Ltd.
    Inventor: Hiroyoshi Funato
  • Patent number: 4470659
    Abstract: A light beam scanning apparatus in which a plurality of mutually equivalent diffraction gratings, or a plurality of mutually equivalent converging holographic lenses, is arranged on a disc in a circle equidistantly and equidirectionally. The disc is revolved at a constant speed around an axis vertical thereto that passes through the center of the circularlly arranged diffraction gratings, or the like. A laser beam is projected incident upon one of the diffraction gratings or holographic lenses on the disc at a predetermined location from a predetermined direction. The laser beam is diffracted by the diffraction grating or the holographic lens, and after converging once, becomes a diverging beam incident upon a concave mirror with a spherical or spheroidal reflecting surface which re-converges the diverging beam on a scan plane.
    Type: Grant
    Filed: November 5, 1981
    Date of Patent: September 11, 1984
    Assignee: Ricoh Company, Ltd.
    Inventor: Hiroyoshi Funato
  • Patent number: 4355858
    Abstract: A hologram lens capable of converting an output beam of light emitted from a semiconductor to a reconstruction light suitable for reconstructing holograms is prepared by use of the object light, which resembles a beam of light emitted divergently from a semiconductor laser for reconstructing holograms and which travels, in the opposite direction to the travelling direction of the beam of light from the semiconductor laser, in such a manner as to converge on a light emitting portion of the semiconductor laser, and the reference light which is an isotropic beam with a circular cross section.
    Type: Grant
    Filed: September 24, 1979
    Date of Patent: October 26, 1982
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroyoshi Funato, Yoshio Fukushima
  • Patent number: 4348080
    Abstract: In an optical scanning apparatus, a hologram prepared by the interference of two rays of light, each of which has a spherical wave or one of which has a spherical wave and the other of which has a plane wave, is illuminated by a reconstruction light containing an image signal, and the reconstruction light and the hologram are moved relative to each other. A beam produced from the hologram in accordance with the relative movement of the hologram is led onto a surface to be scanned, while continuously changing its output angle, and plural beams containing image information therein, which are modulated by plural and different image signals, are caused to enter the hologram simultaneously. Plural beams are thus diffracted and plural lines on the surface to be scanned are scanned simultaneously.
    Type: Grant
    Filed: October 17, 1979
    Date of Patent: September 7, 1982
    Assignee: Ricoh Company, Ltd.
    Inventor: Hiroyoshi Funato
  • Patent number: 4325601
    Abstract: An optical scanning device shifting an optical spot on the scanning surface by rotating a hologram record medium on which a hologram is recorded, is so improved that, in recording a hologram, the incident angle of the principal ray of an object light and the incident angle of the principal ray of a reference light are so defined as to satisfy a particular condition, whereby even if the hologram record is inclined, the optical spot is not displaced.
    Type: Grant
    Filed: March 3, 1980
    Date of Patent: April 20, 1982
    Assignee: Ricoh Co., Ltd.
    Inventor: Hiroyoshi Funato
  • Patent number: 4159166
    Abstract: Two lens groups are arranged symmetrically on opposite sides of a mirror which may be a half-mirror or a dichroic mirror. The mirror is oriented perpendicular to the optical axis of the lens groups. A light image incident on the lens assembly at an angle to the optical axis is split into two beams, one beam being transmitted through the mirror and the other being reflected by the mirror. The refraction of the two beams is the same since the reflected beam passes through the front lens group twice. Where the mirror is dichroic the beams constitute color components of the light image above and below the cutoff wavelength of the dichroic mirror.
    Type: Grant
    Filed: April 14, 1977
    Date of Patent: June 26, 1979
    Assignee: Ricoh Company, Ltd.
    Inventors: Nobuo Kasahara, Hiroyoshi Funato
  • Patent number: 4154500
    Abstract: In an electrostatic copying machine, a light source radiates an elongated, narrow beam of light onto an original document which is moved perpendicular to the beam of light for scanning. A plurality of imaging optical fibers are arranged in a row extending coextensively parallel to the light beam, which focus images of adjacent portions of the document onto a photoconductive member which is moved in a manner conjugate to the original document for scanningly forming an image of the document on the photoconductive member. The imaging optical fibers themselves extend parallel or at an angle to the document. First and second reflectors which may be mirrors or prisms are disposed between the document and imaging optical fibers and between the imaging optical fibers and the photoconductive member respectively to deflect the optical paths of the images.
    Type: Grant
    Filed: April 5, 1977
    Date of Patent: May 15, 1979
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroyoshi Funato, Nobuo Sakuma, Motoaki Kawazu
  • Patent number: 4149269
    Abstract: A large number of closely spaced holograms are formed on a sheet, each hologram comprising an information portion and an identification portion. First scan means movably position the sheet relative to a reconstruction beam and a sensor means for reading a selected hologram. The sensor means reads the identification portion of the reconstructed hologram to determine whether said hologram is the selected hologram. If said hologram is the selected hologram, a second scan means is actuated to read the information area. If said hologram is not the selected hologram, the first scan means is actuated to move to the next hologram. The process is continued until the selected hologram is located. The identification area further comprises a density reference section which is read to produce a bias reference signal for combination with the information signals. In digital applications the bias reference signal establishes the quantization threshold.
    Type: Grant
    Filed: September 28, 1977
    Date of Patent: April 10, 1979
    Assignee: Ricoh Co., Ltd.
    Inventors: Michiharu Abe, Hiroyoshi Funato