Patents by Inventor Keiichi Maeno

Keiichi Maeno 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: 20210055644
    Abstract: A light source device includes a blue laser light module that emits a blue laser light, and a dichroic mirror including an incident surface, and that reflects the incident blue laser light in a second direction different from a first direction which is an emission direction of the blue laser light so as to introduce the blue laser light into a fluorescent body, and allow part of light excited by the fluorescent body and emitted in a direction opposite to the second direction to penetrate through the dichroic mirror. The incident surface is provided with a dichroic coat region coated with a dichroic coat so as to reflect the blue laser light, and the dichroic coat region is formed on the incident surface such that a length in a direction orthogonal to the first direction is longer as a distance from the blue laser module is farther.
    Type: Application
    Filed: August 14, 2020
    Publication date: February 25, 2021
    Inventors: Keiichi MAENO, Tadashi FURUKAWA, Takatsugu AIZAKI
  • Publication number: 20070030457
    Abstract: A projection display apparatus that is lightweight and provides bright, high quality images is provided. The projection display apparatus comprising a color separation and synthesis optical system 4, that performs color synthesis, generating an image, after separating light of the three primary colors of determined polarities into the respective three colors, and modulating those three color lights in relation to respective image signals therefor, and a projection lens 106. The color separation and synthesis optical system 4 comprises polarized light separating means 8, 9, 11 and 16 disposed in respective diagonal directions therein and reflecting spatial light modulating elements 12, 13 and 14 disposed to perform light modulation coordinated to an image signal for each respective color, for light separated according to polarization by the four polarized light separating means 8, 9, 11.
    Type: Application
    Filed: October 11, 2006
    Publication date: February 8, 2007
    Inventors: Tetsuji Suzuki, Keiichi Maeno, Satoru Moriya
  • Patent number: 7131729
    Abstract: A projection display apparatus that is lightweight and provides bright, high quality images is provided. The projection display apparatus comprising a color separation and synthesis optical system 4, that performs color synthesis, generating an image, after separating light of the three primary colors of determined polarities into the respective three colors, and modulating those three color lights in relation to respective image signals therefor, and a projection lens 106. The color separation and synthesis optical system 4 comprises polarized light separating means 8, 9, 11 and 16 disposed in respective diagonal directions therein and reflecting spatial light modulating elements 12, 13 and 14 disposed to perform light modulation coordinated to an image signal for each respective color, for light separated according to polarization by the four polarized light separating means 8, 9, 11.
    Type: Grant
    Filed: March 26, 2004
    Date of Patent: November 7, 2006
    Assignee: Victor Company of Japan Ltd.
    Inventors: Tetsuji Suzuki, Keiichi Maeno, Satoru Moriya
  • Publication number: 20040189950
    Abstract: A projection display apparatus that is lightweight and provides bright, high quality images is provided. The projection display apparatus comprising a color separation and synthesis optical system 4, that performs color synthesis, generating an image, after separating light of the three primary colors of determined polarities into the respective three colors, and modulating those three color lights in relation to respective image signals therefor, and a projection lens 106. The color separation and synthesis optical system 4 comprises polarized light separating means 8, 9, 11 and 16 disposed in respective diagonal directions therein and reflecting spatial light modulating elements 12, 13 and 14 disposed to perform light modulation coordinated to an image signal for each respective color, for light separated according to polarization by the four polarized light separating means 8, 9, 11.
    Type: Application
    Filed: March 26, 2004
    Publication date: September 30, 2004
    Inventors: Tetsuji Suzuki, Keiichi Maeno, Satoru Moriya
  • Publication number: 20040001250
    Abstract: There is disclosed a data presentation apparatus including: a data laying table on which data such as a written/drawn draft and solid material are to be laid; an aspheric reflection mirror, disposed above the vicinity of a side part of the data laying table, for obliquely taking an image light of the data laid on the data laying table and reflecting the image light of the data; an image forming optical system which cooperates with the aspheric reflection mirror to form the image light of the data reflected by the aspheric reflection mirror into an image; and an image pickup element for receiving the image light of the data formed into the image by the image forming optical system.
    Type: Application
    Filed: June 24, 2003
    Publication date: January 1, 2004
    Inventors: Tatsuru Kobayashi, Keiichi Maeno, Manabu Kobayashi, Yoshinori Suzuki
  • Patent number: 5565882
    Abstract: An image processing system for an image display comprising an image data producing device for producing image data corresponding to an image to be displayed and a display device for displaying the image on the basis of the produced image data. The image data producing device divides the image data into a plurality of data sections respectively corresponding to image areas constituting the image so that each of the plurality of data sections is produced as serial data and the plurality of data sections are outputted in parallel. The display device includes a number of pixel elements continuously arranged one-dimensionally or two-dimensionally and equally divided into a plurality of element sections respectively corresponding to the plurality of data sections.
    Type: Grant
    Filed: March 9, 1995
    Date of Patent: October 15, 1996
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Itsuo Takanashi, Shintaro Nakagaki, Ichiro Negishi, Tetsuji Suzuki, Fujiko Tatsumi, Ryusaku Takahashi, Keiichi Maeno
  • Patent number: 5502490
    Abstract: A display unit includes a light-emitting element array having a plurality of linearly arranged light-emitting elements drivable by a time sequential image information signal to emit beams of light in accordance with pieces of information allotted to the corresponding picture elements, a deflector such as a polygon mirror for deflecting the light beams simultaneously in a direction perpendicular to the longitudinal direction of the light-emitting element array, and a light-to-light conversion element including a photoconductive layer and a photo-modulation layer, the light beams being imaged on the photoconductive layer.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: March 26, 1996
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Itsuo Takanashi, Shintaro Nakagaki, Ichiro Negishi, Tetsuji Suzuki, Fujiko Tatsumi, Ryusaku Takahashi, Keiichi Maeno
  • Patent number: 5463468
    Abstract: A display unit includes a light-emitting element array having a plurality of linearly arranged light-emitting elements drivable by a time sequential image information signal to emit beams of light in accordance with pieces of information allotted to the corresponding picture elements, a deflector such as a polygon mirror for deflecting the light beams simultaneously in a direction perpendicular to the longitudinal direction of the light-emitting element array, and a light-to-light conversion element including a photoconductive layer and a photo-modulation layer, the light beams being imaged on the photoconductive layer.
    Type: Grant
    Filed: March 16, 1994
    Date of Patent: October 31, 1995
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Itsuo Takanashi, Shintaro Nakagaki, Ichiro Negishi, Tetsuji Suzuki, Fujiko Tatsumi, Ryusaku Takahashi, Keiichi Maeno
  • Patent number: 5381188
    Abstract: The present invention offers a display system for displaying information comprising a linear array of N light-emitting devices emitting light of predetermined wavelength, the devices are arranged respectively with N pixels, a stream of the information is divided into pieces each of which containing the N pixels, and the N light-emitting devices are caused to emit N light beams simultaneously in a form of array during a given period for every divided piece of the information, the every divided piece of information may correspond to one line of a frame of picture, the N light beams are intensity-modulated respectively with the divided piece of the information, the N light beams are deflected simultaneously in a direction perpendicular to a direction of the array of the N light beams, and a spatial light modulator having a photoconductive layer and a light modulation layer interposed between a pair of electrodes, the photoconductive layer is responsive to the deflected N light beams incident thereto through a fo
    Type: Grant
    Filed: May 4, 1992
    Date of Patent: January 10, 1995
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Toshio Konno, Shintaro Nakagaki, Ichiro Negishi, Tetsuji Suzuki, Fujiko Tatsumi, Ryusaku Takahashi, Keiichi Maeno
  • Patent number: 5357289
    Abstract: This specification discloses an image projector for projecting a tri-color composite optical image on a screen as a magnified optical image. A reading light beam emitted from a light source is separated into three color beams, e.g., Red, Green and Blue color beams through a tri-color separation and composition optical system. The separated color beams are irradiated on image forming devices provided correspondingly with Red, Green and Blue color images to read out color images respectively therefrom. Each of the reflected light beams from the image forming device carrying color image information impinges again on the tri-color separation and composition optical system to compose a composite image beam. The composite image beam is projected on the screen through an optical lens system comprising a first lens group, a second lens group and a third lens group disposed along an optical axis in order.
    Type: Grant
    Filed: January 13, 1994
    Date of Patent: October 18, 1994
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Toshio Konno, Shintaro Nakagaki, Ighiro Negishi, Tetsuji Suzuki, Fujiko Tatsumi, Ryusaku Takahashi, Keiichi Maeno
  • Patent number: 5294992
    Abstract: A light-light transfer method using a spatial light modulator realizes an image display with a high utilizing of light without causing an undesirable residual image. The spatial light modulator is constituted to include two electrodes and at least a photoconductor layer member and a photo-modulation layer member used in a birefringence operating mode both being sandwiched between the two electrodes. A writing light is entered from the photoconductive layer member side so that its exposure value varies from the minimum exposure value to the maximum exposure value in a condition that a predetermined operation voltage is supplied between the two electrodes. In this instant, a voltage applied between both ends of the photo-modulation layer member corresponds to a voltage obtained by subtracting a voltage drop amount, occurring in the photoconductor layer member due to an incidence of the writing light, from said predetermined operation voltage applied in advance between said two electrodes.
    Type: Grant
    Filed: May 4, 1992
    Date of Patent: March 15, 1994
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Toshio Konno, Shintaro Nakagaki, Ichiro Negishi, Tetsuji Suzuki, Fujiko Tatsumi, Ryusaku Takahashi, Keiichi Maeno
  • Patent number: 5264951
    Abstract: There is provided an optical system for a spatial light modulator. The system comprises a light source for emitting an unpolarized light, a separator for separating a first linearly polarized light having a specified plane of polarization from the unpolarized light and polarizer for rotating the plane of polarization of the first linearly polarized light at a specified angle different from the specified angle to obtain a second linearly polarized light, wherein the second linearly polarized light is adopted as a reading light. Also provided is a method of photomodulation, comprising the steps of separating a light in the region of a specified wavelength from an unpolarized light, separating a first linearly polarized light having a specified plane of polarization from the light and obtaining a second linearly polarized light by rotating the plane of polarization of the first linearly polarized light at a specified angle.
    Type: Grant
    Filed: November 23, 1992
    Date of Patent: November 23, 1993
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Itsuo Takanashi, Shintaro Nakagaki, Ichiro Negishi, Ryusaku Takahashi, Tetsuji Suzuki, Fujiko Tatsumi, Keiichi Maeno
  • Patent number: 5250939
    Abstract: A drive apparatus for an optical element array includes a counter counting clock pulses and being periodically reset at a horizontal scanning period. The counter outputs first and second counter signals out of phase with each other. A latch holds a pixel-corresponding segment of an input image signal. One of clock signals out of phase with each other is selected in response to the pixel-corresponding input-signal segment held by the latch. A first comparator compares the first counter signal and the pixel-corresponding input-signal segment held by the latch, and outputs a first identity signal when the first counter signal and the pixel-corresponding input-signal segment are equal to each other. A second comparator compares the second counter signal and the pixel-corresponding input-signal segment held by the latch, and outputs a second identity signal when the second counter signal and the pixel-corresponding input-signal segment are equal to each other.
    Type: Grant
    Filed: November 5, 1991
    Date of Patent: October 5, 1993
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Itsuo Takanashi, Shintaro Nakagaki, Ichiro Negishi, Tetsuji Suzuki, Fujiko Tatsumi, Ryusaku Takahashi, Keiichi Maeno, Tsuyoshi Yoshimura
  • Patent number: 5239322
    Abstract: There is provided an apparatus for displaying an image on a screen by projecting a reading light from a light source onto a spatial light modulator of reflective type in which the image is written, and projecting a reflected light from the modulator corresponding to the image onto the screen through a projection lens, the modulator, lens and screen being provided so that their optical axes are in agreement on one optical path. The apparatus comprises an optical device provided between the lens and screen for the reading light toward the modulator and passing the reflected light to the screen and a converging element for converging the reading light on the position which is on the optical axis of the lens and located between the lens and screen so that the reading light thus turned becomes a parallel pencil beam which is projected onto the modulator in parallel with the optical axis.
    Type: Grant
    Filed: May 15, 1991
    Date of Patent: August 24, 1993
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Itsuo Takanashi, Shintaro Nakagaki, Ichiro Negishi, Tetsuji Suzuki, Fujiko Tatsumi, Ryusaku Takahashi, Keiichi Maeno
  • Patent number: 5227902
    Abstract: A spatial light modulator which includes a light modulation layer which is interposed between two photoconductive layers and laminated to both layers; the two photo conductive layers have charge images written thereon, respectively, by illumination of a writing light carrying optical information; the illumination direction of the writing light to the photoconductive layers are different from each other; and the two photoconductive layers permit the reading light to pass therethrough. When illuminated by a reading light via either of the first or second photoconductive layers, the light modulation layer optically modulates the reading light in accordance with the first and second charge images, under the presence of a voltage applied to the modulator. Thus it reads read out the first information and second information. The first and second photoconductive layers permit the reading light to pass therethrough.
    Type: Grant
    Filed: May 15, 1991
    Date of Patent: July 13, 1993
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Itsuo Takanashi, Shintaro Nakagaki, Ichiro Negishi, Tetsuji Suzuki, Fujiko Tatsumi, Ryusaku Takahashi, Keiichi Maeno
  • Patent number: 5191408
    Abstract: A color imaging system for use as an electronic still camera, for example, includes a color separator for separating the optical image of a subject from a lens into a plurality of different color images, an optical shutter selectively openable for transmitting the optical image of the subject to the color separator, a photoconductive layer for converting the different color images into respective electric charge images, and an information recording medium for recording images corresponding to the electric charge images under an electric field developed between the photoconductive layer and the information recording medium. The timing with which the optical shutter is opened and the timing with which the electric field is generated by the power supply, are controlled by a control unit depending on imaging conditions selected by the user. The color imaging system also has an optical viewfinder for allowing the user to visually observe the optical image of the subject introduced by the lens.
    Type: Grant
    Filed: February 28, 1991
    Date of Patent: March 2, 1993
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Itsuo Takanashi, Shintaro Nakagaki, Tsutou Asakura, Masato Furuya, Yoshihisa Koyama, Yuji Uchiyama, Ichiro Negishi, Tetsuji Suzuki, Fujiko Tatsumi, Ryusaku Takahashi, Keiichi Maeno
  • Patent number: 5164854
    Abstract: There is provided a polarization converter for producing a beam of linearly polarized light from a randomly polarized light. The randomly polarized light is separated into a first polarized light which is projected in a first predetermined direction and a second polarized light having a predetermined angular relationship with the first polarized light. The second polarized light is converted into a third polarized light a polarization of which is identical to that of the first polarized light. By providing a predetermined two-dimensional positional relationship between the first and third polarized lights, the beam of linearly polarized light is produced and advanced on the outside of the converter in a second predetermined direction.
    Type: Grant
    Filed: July 26, 1991
    Date of Patent: November 17, 1992
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Itsuo Takanashi, Shintaro Nakagaki, Ichiro Negishi, Tetsuji Suzuki, Fujiko Tatsumi, Ryusaku Takahashi, Keiichi Maeno
  • Patent number: 5159456
    Abstract: A photo-to-photo transducer is composed by laminating a photoconductive layer member and a photo-modulation layer member including liquid crystals of scattering type each other and disposing the members between two transparent electrodes. The transducer is operated as follows: a specified voltage is applied across the electrodes to operate the photo-modulation layer member in the vicinity of operation threshold level thereof; an electro-magnetic radiation beam for writing information is projected onto the photoconductive layer member through the electrode at the side thereof; and an electro-magnetic radiation beam for reading the information is projected onto the photo-modulation layer member through the electrode at the side thereof, thus the electro-magnetic radiation beam for reading the information is modulated accordingly with intensity of the electro-magnetic radiation beam for writing the information.
    Type: Grant
    Filed: June 15, 1990
    Date of Patent: October 27, 1992
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Itsuo Takanashi, Shintaro Nakagaki, Tsutou Asakura, Masato Furuya, Tetsuji Suzuki, Keiichi Maeno
  • Patent number: 5130826
    Abstract: There is disclosed an optical system for a color picture display having three spatial light modulators of reflecting type corresponding to an optical image of one of three primary colors by photoelectric effect and photomodulation effect, a writing device for guiding writing lights each carrying the optical image of one of the colors to each device, a reading device for guiding reading lights each in the region of wavelength of one of the colors to each device and a composing device for composing a composed reading light of the reading lights which are emitted from the optical devices respectively after optically modulated. The optical system comprises an optical apparatus shared by the reading device and the composing device, having first, second and third prisms, a first dichroic filter provided between the first and the second prisms and a second dichroic filter provided between the second and the third prisms.
    Type: Grant
    Filed: April 3, 1991
    Date of Patent: July 14, 1992
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Itsuo Takanashi, Shintaro Nakagaki, Ichiro Negishi, Tetsuji Suzuki, Fujiko Tatsumi, Ryusaku Takahashi, Keiichi Maeno
  • Patent number: 5122895
    Abstract: An efficiency polarization converter of few optical components for converting a randomly polarized light into a single beam of linearly polarized light, comprises a first optical device receiving the random light and projecting two linearly polarized lights one projected in a first direction, another to a second optical device which changes the polarization plane thereof, the polarization changes light being directed by a third optical device to the first direction, thereby the two linearly polarized light are combined and aligned to have a common polarization to become the single beam linearly polarized light projected in the first direction. Typical first optical device is a polarization beam splitter, a typical second optical device is a quarterwave plate with a mirror, a halfwave plate or a Fresnel rhomb with a mirror, or a photomodulation material interposed between biased electrodes with a mirror, a typical third optical device is a polarization beam splitter, a prism or a mirror.
    Type: Grant
    Filed: December 4, 1990
    Date of Patent: June 16, 1992
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Itsuo Takanashi, Shintaro Nakagaki, Ichiro Negishi, Tetsuji Suzuki, Fujiko Tatsumi, Ryusaku Takahashi, Keiichi Maeno