Patents by Inventor Shinya Kawahara

Shinya Kawahara 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: 7456132
    Abstract: The present invention provides a reversible thermosensitive recording medium including a support and a thermosensitive recording layer thereon, in which the thermosensitive recording layer comprises an electron-donating coloring compound and an electron-accepting compound, and the thermosensitive recording layer is capable of forming a relatively developed condition and a relatively erased condition depending on at least one of the difference of heating temperatures and the difference of cooling rates following to heating, and in which the electron-accepting compound comprises a phenol compound represented by the General Formula (1): where, in the General Formula (1) “l” represents an integer of 1 to 3, “m” represents an integer of 1 or more, and “n” represents an integer of 7 or more.
    Type: Grant
    Filed: July 12, 2005
    Date of Patent: November 25, 2008
    Assignee: Ricoh Company, Ltd.
    Inventors: Satoshi Yamamoto, Kyoji Tsutsui, Hiromi Furuya, Kyohji Okada, Kunio Hayakawa, Shinya Kawahara, Hitoshi Shimbo
  • Patent number: 7439993
    Abstract: To provide an image processing method including at least an image recording step and an image erasing step, wherein a laser beam is parallel light and wherein the laser scanning speed for the peripheral region surrounding the central region of the optical axis of the laser beam is lower than the laser scanning speed for the central region, the laser output for the peripheral region is greater than the output for the central region, or an overlapping area between a laser irradiation area that corresponds to a peripheral region surrounding a central region of the optical axis of the laser beam and a nearby laser irradiation area is larger than an overlapping area between a laser irradiation area that corresponds to the central region and the nearby laser irradiation area.
    Type: Grant
    Filed: March 14, 2007
    Date of Patent: October 21, 2008
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomomi Ishimi, Shinya Kawahara, Yoshihiko Hotta
  • Patent number: 7432223
    Abstract: A reversible thermosensitive recording medium including a substrate, a reversible thermosensitive recording layer and an intermediate layer. The reversible thermosensitive recording layer is configured to reversibly record and erase an image therein and disposed overlying the substrate and includes a binder resin and a reversible thermosensitive coloring composition. The reversible thermosensitive coloring composition includes an electron donating coloring compound and an electron accepting compound. The intermediate layer includes another binder resin and a content of hollow particles having a hollow ratio not less than 70% and a ratio of a maximum particle diameter thereof to a 50% cumulative particle diameter of from 2.0 to 3.0. The reversible thermosensitive recording layer achieves a colored state when heated to a temperature not lower than a melting point thereof, and achieves a discolorization state when heated to a temperature lower than the melting point.
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: October 7, 2008
    Assignee: Ricoh Company, Ltd.
    Inventors: Kunio Hayakawa, Shinya Kawahara, Hitoshi Shimbo
  • Patent number: 7422996
    Abstract: There is provided a reversible thermosensitive recording medium including a support, an intermediate layer, and a thermosensitive recording layer which reversibly changes a color thereof depending on a temperature, wherein the thermosensitive recording layer contains an electron-donating coloring compound, and an electron-accepting compound represented by the following general formula 1: where, n is an integer of 23 or more, and wherein the intermediate layer is disposed between the support and the thermosensitive recording layer, and contains hollow particles having a void ratio of 70% or more, a maximum diameter D100 of 5.0 ?m to 10.0 ?m, and a ratio D100/D50 of 2.0 to 3.0 where the ratio D100/D50 is a ratio of the maximum diameter D100 to a 50% cumulative particle diameter D50 of the hollow particles.
    Type: Grant
    Filed: March 15, 2007
    Date of Patent: September 9, 2008
    Assignee: Ricoh Company, Ltd.
    Inventors: Hitoshi Shimbo, Kunio Hayakawa, Shinya Kawahara
  • Publication number: 20080214391
    Abstract: The present invention provides an image processing method which includes at least any one of image recording and image erasing, wherein a light irradiation intensity at a center position of the laser beam irradiated in the image recording is controlled; in the image recording, a first auxiliary line extended by a predetermined distance from a start point of each of image lines constituting an image in the opposite direction from the scanning direction and a second auxiliary line extended by a predetermined distance from an end point of each of the image lines in the scanning direction are prepared, and when the first and second auxiliary lines including an image line are continuously scanned, the image line is scanned with irradiating the laser beam, and the first and the second auxiliary lines are scanned without irradiating the laser beam to thereby record the image.
    Type: Application
    Filed: December 21, 2007
    Publication date: September 4, 2008
    Applicant: Ricoh Company, Ltd.
    Inventors: Shinya KAWAHARA, Yoshihiko Hotta, Tomomi Ishimi
  • Publication number: 20080192618
    Abstract: A surface-condition-information obtaining unit obtains information on a surface condition of a rewritable display medium on which information is reversely displayed visually. A write-laser output unit outputs a write laser to irradiate the rewritable display medium with the write laser, to perform a drawing on the rewritable display medium. A control unit performs a write process for displaying an image on the rewritable display medium by adjusting a laser output condition based on the information obtained by the surface-condition-information obtaining unit and controlling the write-laser output unit based on an adjustment of the laser output condition.
    Type: Application
    Filed: February 8, 2008
    Publication date: August 14, 2008
    Inventors: Yoshiko NAKATA, Tsutomu Nakajima, Noriyuki Ochiai, Yukiko Sahashi, Yoshihiko Hotta, Shinya Kawahara, Hiroshi Uenishi, Tomomi Ishimi
  • Publication number: 20080153698
    Abstract: The present invention provides an image processing method which includes any one of recording an image on a thermally reversible recording medium that can reversibly change any one of its transparency and color tone depending on temperature by irradiating and heating the thermally reversible recording medium with a laser beam, and erasing the image recorded on the thermally reversible recording medium by heating the thermally reversible recording medium, wherein in any one of the image recording and the image erasing, the thermally reversible recording medium is located at a position farther than a focal position of the laser beam, and at least any one of the image recording and the image erasing is performed.
    Type: Application
    Filed: December 21, 2007
    Publication date: June 26, 2008
    Applicant: Ricoh Company, Ltd.
    Inventors: Shinya Kawahara, Yoshihiko Hotta, Tomomi Ishimi
  • Publication number: 20080151033
    Abstract: The present invention provides an image processing method which includes at least any one of an image recording step and an image erasing step, wherein a light irradiation intensity I1 at a center position of the laser beam irradiated in the image recording step and a light irradiation intensity I2 on an 80% light energy bordering surface to the total light energy of the irradiated laser beam satisfy the expression, 0.40?I1/I2?2.00, and in the image recording step, at an overlap portion where a first image line among a plurality of image lines constituting an image is overlapped with a second image line, any one of the first image line and the second image line is not to be recorded.
    Type: Application
    Filed: December 21, 2007
    Publication date: June 26, 2008
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomomi Ishimi, Yoshihiko Hotta, Shinya Kawahara
  • Patent number: 7338919
    Abstract: A reversible thermosensitive recording medium including a substrate; and a reversible thermosensitive recording layer located on the substrate and reversibly achieving a relatively colored state and a relatively discolored state depending on the temperature to which the recording layer is heated or the cooling speed at which the recording layer is cooled after heating, wherein the reversible thermosensitive recording layer comprises a polyalkylene glycol compound having a number average molecular weight not less than 2,000 exclusive of polypropylene glycol having a number average molecular weight not greater than 5,000. A reversible thermosensitive recording device, and an image processing method and apparatus using the reversible thermosensitive recording medium are also be provided.
    Type: Grant
    Filed: March 2, 2005
    Date of Patent: March 4, 2008
    Assignee: Ricoh Company, Ltd.
    Inventors: Shinya Kawahara, Kunio Hayakawa, Hitoshi Shimbo
  • Publication number: 20070285488
    Abstract: To provide an image processing method including at least an image recording step and an image erasing step, wherein a laser beam is parallel light and wherein the laser scanning speed for the peripheral region surrounding the central region of the optical axis of the laser beam is lower than the laser scanning speed for the central region, the laser output for the peripheral region is greater than the output for the central region, or an overlapping area between a laser irradiation area that corresponds to a peripheral region surrounding a central region of the optical axis of the laser beam and a nearby laser irradiation area is larger than an overlapping area between a laser irradiation area that corresponds to the central region and the nearby laser irradiation area.
    Type: Application
    Filed: March 14, 2007
    Publication date: December 13, 2007
    Inventors: Tomomi Ishimi, Shinya Kawahara, Yoshihiko Hotta
  • Publication number: 20070225162
    Abstract: To provide an image processing method including at least one of an image recording step and an image erasing step, wherein (1) laser beams are swept in the same direction and laser scanning involves a period where laser application is discontinued, (2) laser beams are swept in alternating directions and the laser scanning involves a period where laser application is discontinued, (3) laser beams are swept in alternating directions and laser scanning involves a period where laser application is discontinued, wherein the period involves no laser beam application from first laser scanning end point to second laser scanning point, or (4) laser beams are applied in alternating directions while avoiding continuous laser irradiation of nearby portions between adjacent laser beam lines, and laser scanning involves a period where laser application is discontinued.
    Type: Application
    Filed: March 14, 2007
    Publication date: September 27, 2007
    Inventors: Shinya Kawahara, Tomomi Ishimi, Yoshihiko Hotta
  • Publication number: 20070225163
    Abstract: The reversible thermosensitive recording medium according to the present invention comprises a support, a thermosensitive layer and a protective layer in order, the thermosensitive layer comprises an electron-donating coloring compound and an electron-accepting compound and reversibly changes the color depending on temperatures, and the protective layer comprises a reactive heterocyclic compound, and inorganic fine particles of which surface is at least partially treated into hydrophobic, alternatively the protective layer comprises inorganic fine particles of which number-average particle size is 100 nm or less and of which surface is at least partially coated with organic silane compounds.
    Type: Application
    Filed: May 21, 2007
    Publication date: September 27, 2007
    Inventors: Hitoshi Shimbo, Tadafumi Tatewaki, Shin Yamamoto, Kunio Hayakawa, Shinya Kawahara
  • Publication number: 20070225161
    Abstract: The present invention provides a reversible thermosensitive recording medium including a support and a thermosensitive recording layer thereon, in which the thermosensitive recording layer comprises an electron-donating coloring compound and an electron-accepting compound, and the thermosensitive recording layer is capable of forming a relatively developed condition and a relatively erased condition depending on at least one of the difference of heating temperatures and the difference of cooling rates following to heating, and in which the electron-accepting compound comprises a phenol compound represented by the General Formula (1): where, in the General Formula (1) “l” represents an integer of 1 to 3, m represents an integer of 1 or more, and n represents an integer of 7 or more.
    Type: Application
    Filed: July 12, 2005
    Publication date: September 27, 2007
    Inventors: Satoshi Yamamoto, Kyoji Tsutsui, Hiromi Furuya, Kyohji Okada, Kunio Hayakawa, Shinya Kawahara, Hitoshi Shimbo
  • Publication number: 20070219093
    Abstract: There is provided a reversible thermosensitive recording medium including a support, an intermediate layer, and a thermosensitive recording layer which reversibly changes a color thereof depending on a temperature, wherein the thermosensitive recording layer contains an electron-donating coloring compound, and an electron-accepting compound represented by the following general formula 1: where, n is an integer of 23 or more, and wherein the intermediate layer is disposed between the support and the thermosensitive recording layer, and contains hollow particles having a void ratio of 70% or more, a maximum diameter D100 of 5.0 ?m to 10.0 ?m, and a ratio D100/D50 of 2.0 to 3.0 where the ratio D100/D50 is a ratio of the maximum diameter D100 to a 50% cumulative particle diameter D50 of the hollow particles.
    Type: Application
    Filed: March 15, 2007
    Publication date: September 20, 2007
    Inventors: Hitoshi Shimbo, Kunio Hayakawa, Shinya Kawahara
  • Patent number: 7238642
    Abstract: The reversible thermosensitive recording medium according to the present invention comprises a support, a thermosensitive layer and a protective layer in order, the thermosensitive layer comprises an electron-donating coloring compound and an electron-accepting compound and reversibly changes the color depending on temperatures, and the protective layer comprises a reactive heterocyclic compound, and inorganic fine particles of which surface is at least partially treated into hydrophobic, alternatively the protective layer comprises inorganic fine particles of which number-average particle size is 100 nm or less and of which surface is at least partially coated with organic silane compounds.
    Type: Grant
    Filed: June 22, 2004
    Date of Patent: July 3, 2007
    Assignee: Ricoh Company, Ltd.
    Inventors: Hitoshi Shimbo, Tadafumi Tatewaki, Shin Yamamoto, Kunio Hayakawa, Shinya Kawahara
  • Publication number: 20070036039
    Abstract: It is an object of the present invention to provide a method for image processing and an image processing apparatus which are capable of performing repetitive forming and erasing of high-contrast images at high speeds by forming high-density, uniform images and uniformly erasing images in a short period of time, and in addition, suppressing the degradation of the thermoreversible recording medium due to repetitive forming and erasing is possible.
    Type: Application
    Filed: August 10, 2006
    Publication date: February 15, 2007
    Inventors: Shinya Kawahara, Yoshihiko Hotta, Satoshi Arai
  • Publication number: 20050197250
    Abstract: A reversible thermosensitive recording medium including a substrate; and a reversible thermosensitive recording layer located on the substrate and reversibly achieving a relatively colored state and a relatively discolored state depending on the temperature to which the recording layer is heated or the cooling speed at which the recording layer is cooled after heating, wherein the reversible thermosensitive recording layer comprises a polyalkylene glycol compound having a number average molecular weight not less than 2,000 exclusive of polypropylene glycol having a number average molecular weight not greater than 5,000. A reversible thermosensitive recording device, and an image processing method and apparatus using the reversible thermosensitive recording medium are also be provided.
    Type: Application
    Filed: March 2, 2005
    Publication date: September 8, 2005
    Inventors: Shinya Kawahara, Kunio Hayakawa, Hitoshi Shimbo
  • Publication number: 20050137088
    Abstract: A reversible thermosensitive recording medium including a substrate, a reversible thermosensitive recording layer and an intermediate layer. The reversible thermosensitive recording layer is configured to reversibly record and erase an image therein and disposed overlying the substrate and includes a binder resin and a reversible thermosenstive coloring composition. The reversible thermosenstive coloring composition includes an electron donating coloring compound and an electron accepting compound. The intermediate layer includes another binder resin and a content of hollow particles having a hollow ratio not less than 70% and a ratio of a maximum particle diameter thereof to a 50% cumulative particle diameter of from 2.0 to 3.0. The reversible thermosensitive recording layer achieves a colored state when heated to a temperature not lower than a melting point thereof, and achieves a discolorization state when heated to a temperature lower than the melting point.
    Type: Application
    Filed: December 17, 2004
    Publication date: June 23, 2005
    Inventors: Kunio Hayakawa, Shinya Kawahara, Hitoshi Shimbo
  • Publication number: 20050014645
    Abstract: The reversible thermosensitive recording medium according to the present invention comprises a support, a thermosensitive layer and a protective layer in order, the thermosensitive layer comprises an electron-donating coloring compound and an electron-accepting compound and reversibly changes the color depending on temperatures, and the protective layer comprises a reactive heterocyclic compound, and inorganic fine particles of which surface is at least partially treated into hydrophobic, alternatively the protective layer comprises inorganic fine particles of which number-average particle size is 100 nm or less and of which surface is at least partially coated with organic silane compounds.
    Type: Application
    Filed: June 22, 2004
    Publication date: January 20, 2005
    Inventors: Hitoshi Shimbo, Tadafumi Tatewaki, Shin Yamamoto, Kunio Hayakawa, Shinya Kawahara
  • Patent number: 6309696
    Abstract: A sublimation thermal transfer recording material which includes a substrate and an ink layer formed on the substrate for forming a color image, the ink layer including a plurality of sublimable dye groups each of which has different hue and each of which includes one or more sublimable dyes, wherein, provided that weighted average values of solubility of each dye to toluene in each sublimable dye group are values D1, D2, D3, . . . , and Dn, and a maximum value thereof is Dh, each of the values Dn other than the maximum value Dh is greater than about 0.5×Dh, and/or wherein, provided that weighted average values of a product of solubility of each dye to toluene and an extinction coefficient of the dye in each sublimable dye group are values E1, E2, E3, . . . , and En, and a maximum value thereof is Eh, each of the values En other than the maximum value Eh is greater than about 0.5×Eh.
    Type: Grant
    Filed: October 8, 1999
    Date of Patent: October 30, 2001
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidehiro Mochizuki, Shinya Kawahara, Makoto Sekiyama, Yutaka Ariga