Patents by Inventor Tomoko Kumasawa
Tomoko Kumasawa 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: 9001401Abstract: A process by which a multi-image type hologram, wherein one 3D image changes over to another depending on a viewing direction, can be fabricated in a simple construction, and a multi-image type hologram fabricated by that process. According to the process for the fabrication of a multi-image type hologram wherein one image changes over to another depending on a viewing direction, the area of a hologram recording material is divided into a plurality of sub-areas. Objects to be displayed on different images are holographically recorded in the respective sub-areas, using reference light having the same angle of incidence, images recorded in the respective sub-areas are simultaneously reconstructed from the recorded first-stage hologram, so that a second-stage hologram recording material is located near the reconstructed object images for recording them as a reflection or transmission type volume hologram.Type: GrantFiled: December 7, 2006Date of Patent: April 7, 2015Assignee: Dai Nippon Printing Co., Ltd.Inventors: Tsuyoshi Yamauchi, Masachika Watanabe, Tomoko Kumasawa, Makio Kurashige, Akiko Kitamura, Mitsuru Kitamura, Kenji Ueda
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Patent number: 8743443Abstract: The invention provides a hologram fabrication process, characterized by comprising steps of fabricating a computer-generated hologram (CGH) having amplitude information and phase information recorded by computer operation on a given recording surface, irradiating the computer-generated hologram (CGH) with the first reconstructing illumination light (2) to generate the first diffracted light (3) from the computer-generated hologram (CGH) thereby reconstructing a first reconstruction image (O?), simultaneously entering the first diffracted light (3) and the first reference light (4) in a first-stage hologram recording material (11) faced away from the first reconstructed image to record a first-stage hologram (11) in it, irradiating the recorded first-stage hologram (11) with the second reconstructing illumination light (5) to generate the second diffracted light (6) from the first-stage hologram (11) thereby reconstructing the second reconstruction image (O?), and simultaneously entering the second diffractedType: GrantFiled: November 12, 2007Date of Patent: June 3, 2014Assignee: Dai Nippon Printing Co., Ltd.Inventors: Tomoko Kumasawa, Makio Kurashige, Mitsuru Kitamura, Masachika Watanabe
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Patent number: 8289595Abstract: The invention relates to a security-conscious hologram which can apply a sufficient three-dimensional appearance to a reconstructed image in both its vertical and horizontal directions, and which is difficult to illegally copy and easily told from any illegal copy forged from it, and a holographic process of recording it The hologram H2 is of a combined reflection and volume type, wherein a subject image P is recorded, and minute reflection images F and O? from a light source are recorded at least in front of, or in the rear of, the subject image P, both in a reconstructible fashion, and a viewing position E is moved along a hologram surface, so that the subject image P and the minute reflection images F and O? are viewable at varied relative positions.Type: GrantFiled: April 10, 2009Date of Patent: October 16, 2012Assignee: Dai Nippon Printing Co., Ltd.Inventors: Tsuyoshi Yamauchi, Masachika Watanabe, Tomoko Kumasawa
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Patent number: 7940436Abstract: An authenticity indicator is difficult to be forged and has an authenticity that can be confirmed easily and accurately. The authenticity of the authenticity indicator can be checked by making light enter the authenticity indicator from front side and observing the light emerging from the front side or rear side. The authenticity indicator includes a polarized-light selectively reflecting layer that reflects a specified polarized component of incident light, and a transmission volume hologram layer disposed on the front side of the polarized-light selectively reflecting layer. According to this authenticity indicator, its authenticity can be checked accurately by making use of its first authenticity recognition function attributed to the diffracting action of the transmission volume hologram layer and its second authenticity recognition function attributed to the polarized-light selectivity of the polarized-light selectively reflecting layer.Type: GrantFiled: March 28, 2007Date of Patent: May 10, 2011Assignee: Dai Nippon Printing Co., Ltd.Inventor: Tomoko Kumasawa
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Patent number: 7719762Abstract: The present invention provides a see-through transmitting-reflecting projection screen excellent in transparency, capable of sharply displaying, on its both sides, identical or different images even under bright environmental light. A transmitting-reflecting projection screen 10 comprises a reflection-type screen 11 and a transmission-type screen 12. The reflection-type screen 11 reflects a specific polarized component of imaging light projected. The reflection-type screen 11 does not reflect a polarized component, different from the specific polarized component, of the imaging light, and this polarized component passes through the reflection-type screen 11 and the transmission-type screen 12.Type: GrantFiled: January 18, 2006Date of Patent: May 18, 2010Assignee: Dai Nippon Printing Co., Ltd.Inventors: Tomoko Kumasawa, Masanori Umeya, Masachika Watanabe, Tsuyoshi Yamauchi
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Publication number: 20100073745Abstract: The invention provides a hologram fabrication process, characterized by comprising steps of fabricating a computer-generated hologram (CGH) having amplitude information and phase information recorded by computer operation on a given recording surface, irradiating the computer-generated hologram (CGH) with the first reconstructing illumination light (2) to generate the first diffracted light (3) from the computer-generated hologram (CGH) thereby reconstructing a first reconstruction image (O?), simultaneously entering the first diffracted light (3) and the first reference light (4) in a first-stage hologram recording material (11) faced away from the first reconstructed image to record a first-stage hologram (11) in it, irradiating the recorded first-stage hologram (11) with the second reconstructing illumination light (5) to generate the second diffracted light (6) from the first-stage hologram (11) thereby reconstructing the second reconstruction image (O?), and simultaneously entering the second diffractedType: ApplicationFiled: November 12, 2007Publication date: March 25, 2010Applicant: DAI NIPPON PRINTING CO., LTDInventors: Tomoko Kumasawa, Makio Kurashige, Mitsuru Kitamura, Masachika Watanabe
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Patent number: 7598025Abstract: The present invention is characterized to provide a hologram silver halide photographic material having high sensitivity and diffraction efficiency, providing an excellent image and having less color residue and noise in a transparent part, a hologram, a method for producing the same. In the present invention, a hologram silver halide photographic material having at least one silver halide emulsion layer formed on a support, wherein an average particle diameter of silver halide particles in a silver halide emulsion is 0.03 ?m to 0.07 ?m; a film thickness of the silver halide emulsion layer is 4 ?m to 9 ?m; a silver/gelatin ratio of the silver halide emulsion layer is 0.3 to 0.6; and the silver halide emulsion layer contains sensitizing dye of specific structure.Type: GrantFiled: January 17, 2007Date of Patent: October 6, 2009Assignees: Konica Minolta Opto Inc., Dia Nippon Printing Co., Ltd.Inventors: Kenji Michiue, Tomonobu Moriya, Masashi Iwasaki, Toshihiro Kubota, Masachika Watanabe, Tsuyoshi Yamauchi, Tomoko Kumasawa, Kenji Ueda
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Publication number: 20090195846Abstract: The invention relates to a security-conscious hologram which can apply a sufficient three-dimensional appearance to a reconstructed image in both its vertical and horizontal directions, and which is difficult to illegally copy and easily told from any illegal copy forged from it, and a holographic process of recording it The hologram H2 is of a combined reflection and volume type, wherein a subject image P is recorded, and minute reflection images F and O? from a light source are recorded at least in front of, or in the rear of, the subject image P, both in a reconstructible fashion, and a viewing position E is moved along a hologram surface, so that the subject image P and the minute reflection images F and O? are viewable at varied relative positions.Type: ApplicationFiled: April 10, 2009Publication date: August 6, 2009Applicant: DAI NIPPON PRINTING CO., LTD.Inventors: Tsuyoshi YAMAUCHI, Masachika Watanabe, Tomoko Kumasawa
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Patent number: 7538919Abstract: The invention relates to a security-conscious hologram which can apply a sufficient three-dimensional appearance to a reconstructed image in both its vertical and horizontal directions, and which is difficult to illegally copy and easily told from any illegal copy forged from it, and a holographic process of recording it. The hologram H2 is of a combined reflection and volume type, wherein a subject image P is recorded, and minute reflection images F and O? from a light source are recorded at least in front of, or in the rear of, the subject image P, both in a reconstructible fashion, and a viewing position E is moved along a hologram surface, so that the subject image P and the minute reflection images F and O? are viewable at varied relative positions.Type: GrantFiled: July 11, 2006Date of Patent: May 26, 2009Assignee: Dai Nippon Printing Co., Ltd.Inventors: Tsuyoshi Yamauchi, Masachika Watanabe, Tomoko Kumasawa
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Publication number: 20070291339Abstract: An authenticity indicator that is difficult to be forged and whose authenticity can be confirmed easily and accurately is provided. The authenticity of the authenticity indicator 10 can be checked by making light enter the authenticity indicator 10 from front side and observing the light emerging from the front side or rear side. The authenticity indicator comprises a polarized-light selectively reflecting layer 30 that reflects a specified polarized component of incident light, and a transmission volume hologram layer 20 disposed on the front side of the polarized-light selectively reflecting layer 30. According to this authenticity indicator, its authenticity can be checked accurately by making use of its first authenticity recognition function attributed to the diffracting action of the transmission volume hologram layer and its second authenticity recognition function attributed to the polarized-light selectivity of the polarized-light selectively reflecting layer.Type: ApplicationFiled: March 28, 2007Publication date: December 20, 2007Applicant: DAI NIPPON PRINTING CO., LTD.Inventor: Tomoko Kumasawa
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Publication number: 20070183011Abstract: The invention relates to a process by which a multi-image type hologram wherein one 3D image changes over to another depending on a viewing direction can be fabricated in simple construction and a multi-image type hologram fabricated by that process. According to the process for the fabrication of a multi-image type hologram wherein one image changes over to another depending on a viewing direction, the area of a hologram recording material is divided into a plurality of sub-areas 111, 112 and 113. Objects to be displayed on different images are holo-graphically recorded in the respective sub-areas, using reference light having the same angle of incidence, thereby recording the first-stage hologram 11.Type: ApplicationFiled: December 7, 2006Publication date: August 9, 2007Applicant: DAI NIPPON PRINTING CO., LTD.Inventors: Tsuyoshi YAMAUCHI, Masachika WATANABE, Tomoko KUMASAWA, Makio KURASHIGE, Akiko KITAMURA, Mitsuru KITAMURA, Kenji UEDA
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Publication number: 20070172779Abstract: The present invention is characterized to provide a hologram silver halide photographic material having high sensitivity and diffraction efficiency, providing an excellent image and having less color residue and noise in a transparent part, a hologram, a method for producing the same. In the present invention, a hologram silver halide photographic material having at least one silver halide emulsion layer formed on a support, wherein an average particle diameter of silver halide particles in a silver halide emulsion is 0.03 ?m to 0.07 ?m; a film thickness of the silver halide emulsion layer is 4 ?m to 9 ?m; a silver/gelatin ratio of the silver halide emulsion layer is 0.3 to 0.6; and the silver halide emulsion layer contains sensitizing dye of specific structure.Type: ApplicationFiled: January 17, 2007Publication date: July 26, 2007Applicants: Dai Nippon Printing Co., Ltd., Konica Minolta Opto Inc.Inventors: Kenji Michiue, Tomonobu Moriya, Masashi Iwasaki, Toshihiro Kubota, Masachika Watanabe, Tsuyoshi Yamauchi, Tomoko Kumasawa, Kenji Ueda
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Publication number: 20070008596Abstract: The invention relates to a security-conscious hologram which can apply a sufficient three-dimensional appearance to a reconstructed image in both its vertical and horizontal directions, and which is difficult to illegally copy and easily told from any illegal copy forged from it, and a holographic process of recording it. The hologram H2 is of a combined reflection and volume type, wherein a subject image P is recorded, and minute reflection images F and O? from a light source are recorded at least in front of, or in the rear of, the subject image P, both in a reconstructible fashion, and a viewing position E is moved along a hologram surface, so that the subject image P and the minute reflection images F and O? are viewable at varied relative positions.Type: ApplicationFiled: July 11, 2006Publication date: January 11, 2007Inventors: Tsuyoshi Yamauchi, Masachika Watanabe, Tomoko Kumasawa
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Publication number: 20060181769Abstract: The present invention provides a see-through transmitting-reflecting projection screen excellent in transparency, capable of sharply displaying, on its both sides, identical or different images even under bright environmental light. A transmitting-reflecting projection screen 10 comprises a reflection-type screen 11 and a transmission-type screen 12. The reflection-type screen 11 reflects a specific polarized component of imaging light projected. The reflection-type screen 11 does not reflect a polarized component, different from the specific polarized component, of the imaging light, and this polarized component passes through the reflection-type screen 11 and the transmission-type screen 12.Type: ApplicationFiled: January 18, 2006Publication date: August 17, 2006Applicant: DAI NIPPON PRINTING CO., LTD.Inventors: Tomoko Kumasawa, Masanori Umeya, Masachika Watanabe, Tsuyoshi Yamauchi
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Patent number: RE44890Abstract: An authenticity indicator is difficult to be forged and has an authenticity that can be confirmed easily and accurately. The authenticity of the authenticity indicator can be checked by making light enter the authenticity indicator from front side and observing the light emerging from the front side or rear side. The authenticity indicator includes a polarized-light selectively reflecting layer that reflects a specified polarized component of incident light, and a transmission volume hologram layer disposed on the front side of the polarized-light selectively reflecting layer. According to this authenticity indicator, its authenticity can be checked accurately by making use of its first authenticity recognition function attributed to the diffracting action of the transmission volume hologram layer and its second authenticity recognition function attributed to the polarized-light selectivity of the polarized-light selectively reflecting layer.Type: GrantFiled: March 13, 2013Date of Patent: May 13, 2014Assignee: Dai Nippon Printing Co., Ltd.Inventor: Tomoko Kumasawa