Patents by Inventor Miki Shiraogawa
Miki Shiraogawa 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: 8373829Abstract: A light source comprising sidelight type backlight light guide plate (L), wherein a transmittance angle dependent layer (T1) which transmits normally incident light and reflects obliquely incident light is disposed on one surface of the sidelight type backlight light guide plate (L), and a reflection plate (R) having a repetitive slope structure is disposed on the other surface of the sidelight type backlight light guide plate (L). The invention light source is less in absorption loss due to repetition of light reflection and the like.Type: GrantFiled: October 26, 2010Date of Patent: February 12, 2013Assignee: Nitto Denko CorporationInventors: Kazutaka Hara, Naoki Takahashi, Kentarou Takeda, Miki Shiraogawa
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Publication number: 20110037927Abstract: A light source comprising sidelight type backlight light guide plate (L), wherein a transmittance angle dependent layer (T1) which transmits normally incident light and reflects obliquely incident light is disposed on one surface of the sidelight type backlight light guide plate (L), and a reflection plate (R) having a repetitive slope structure is disposed on the other surface of the sidelight type backlight light guide plate (L). The invention light source is less in absorption loss due to repetition of light reflection and the like.Type: ApplicationFiled: October 26, 2010Publication date: February 17, 2011Applicant: NITTO DENKO CORPORATIONInventors: Kazutaka Hara, Naoki Takahashi, Kentarou Takeda, Miki Shiraogawa
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Patent number: 7841730Abstract: A light source comprising sidelight type backlight light guide plate (L), wherein a transmittance angle dependent layer (T1) which transmits normally incident light and reflects obliquely incident light is disposed on one surface of the sidelight type backlight light guide plate (L), and a reflection plate (R) having a repetitive slope structure is disposed on the other surface of the sidelight type backlight light guide plate (L). The invention light source is less in absorption loss due to repetition of light reflection and the like.Type: GrantFiled: August 20, 2004Date of Patent: November 30, 2010Assignee: Nitto Denko CorporationInventors: Kazutaka Hara, Naoki Takahashi, Kentarou Takeda, Miki Shiraogawa
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Patent number: 7777836Abstract: There is provided a liquid crystal display apparatus having a high contrast ratio in an oblique direction and small color change depending upon a viewing angle. A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a first polarizer placed on one side of the liquid crystal cell; a second polarizer placed on the other side of the liquid crystal cell; a first O-plate placed between the liquid crystal cell and the first polarizer; a second O-plate placed between the liquid crystal cell and the second polarizer; a first biaxial retardation layer placed between the liquid crystal cell and the first O-plate; and a second biaxial retardation layer placed between the liquid crystal cell and the second O-plate.Type: GrantFiled: April 5, 2007Date of Patent: August 17, 2010Assignee: Nitto Denko CorporationInventors: Miki Shiraogawa, Junichi Inagaki
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Patent number: 7746421Abstract: An optical element comprising: a polarizing element (A), separating incident light into polarization to then emit light, and made of a cholesteric liquid crystal, and a linearly polarized light reflection polarizer (B) transmitting linearly polarized light with one polarization axis and selectively reflecting linearly polarized light with the other polarization axis perpendicular to the one polarization axis, wherein the polarizing element (A) has a distortion rate with respect to emitting light to incident light in the normal direction of 0.5 or more and a distortion rate with respect to emitting light to incident light at an angle inclined from the normal direction by 60 degrees or more of 0.2 or less, the polarizing element (A) has a function increasing a linearly polarized light component of emitting light as incidence angle is larger; is capable of condensation and collimation of incident light from a light source and capable of suppressing transmission of light in an arbitrary direction.Type: GrantFiled: August 24, 2004Date of Patent: June 29, 2010Assignee: Nitto Denko CorporationInventors: Naoki Takahashi, Kazutaka Hara, Miki Shiraogawa, Kentarou Takeda
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Patent number: 7742136Abstract: A sheet with anti-counterfeit functions for making counterfeiting highly difficult in the case where authentication information is recorded using the properties of cholesteric liquid crystal is provided. A cholesteric liquid crystal layer 110 having a selective reflected wavelength band in at least the visible light region is provided in such a manner that this cholesteric liquid crystal layer 110 is a single layer of which thickness is approximately uniform, and an authentication region 112 of which selective reflected wavelength band is different is provided in at least one place. Preferably, an adhesive layer 130 is provided on one side of the cholesteric liquid crystal layer 110. Preferably, a base 120 is provided between the cholesteric liquid crystal layer 110 and the adhesive layer 130. Preferably, a light absorbing layer 140 is provided on adhesive layer 130 of the cholesteric liquid crystal layer 110.Type: GrantFiled: November 17, 2005Date of Patent: June 22, 2010Assignee: Nitto Denko CorporationInventors: Seiji Umemoto, Miki Shiraogawa, Takahiro Fukuoka, Naoki Takahashi, Kentarou Takeda
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Patent number: 7633678Abstract: An optical element of the invention comprises at least two laminated layers of reflective polarizer; and at least one retardation layer for changing polarization properties laminated between the reflective polarizers, the combination of the layers being designed so as to provide a incident-light transmittance depending on an incident angle of an incident light and designed such that a shielded light is not absorbed but reflected. The optical element can effectively shield transmitted lights with respect to obliquely incident lights and can control coloring.Type: GrantFiled: January 7, 2009Date of Patent: December 15, 2009Assignee: Nitto Denko CorporationInventors: Naoki Takahashi, Kentarou Takeda, Kazutaka Hara, Miki Shiraogawa
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Patent number: 7630134Abstract: An optical element of the invention comprises at least two laminated layers of reflective polarizer; and at least one retardation layer for changing polarization properties laminated between the reflective polarizers, the combination of the layers being designed so as to provide a incident-light transmittance depending on an incident angle of an incident light and designed such that a shielded light is not absorbed but reflected. The optical element can effectively shield transmitted lights with respect to obliquely incident lights and can control coloring.Type: GrantFiled: January 7, 2009Date of Patent: December 8, 2009Assignee: Nitto Denko CorporationInventors: Naoki Takahashi, Kentarou Takeda, Kazutaka Hara, Miki Shiraogawa
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Publication number: 20090231517Abstract: There is provided a liquid crystal display apparatus having a high contrast ratio in an oblique direction and small color change depending upon a viewing angle. A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a first polarizer placed on one side of the liquid crystal cell; a second polarizer placed on the other side of the liquid crystal cell; a first O-plate placed between the liquid crystal cell and the first polarizer; a second O-plate placed between the liquid crystal cell and the second polarizer; a first biaxial retardation layer placed between the liquid crystal cell and the first O-plate; and a second biaxial retardation layer placed between the liquid crystal cell and the second O-plate.Type: ApplicationFiled: April 5, 2007Publication date: September 17, 2009Applicant: NITTO DENKO CORPORATIONInventors: Miki Shiraogawa, Junichi Inagaki
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Publication number: 20090128907Abstract: An optical element of the invention comprises at least two laminated layers of at least one kind of reflective polarizer (a); and at least one layer of at least one kind of retardation layer (b) for changing polarization properties laminated between the reflective polarizers (a), the combination of the layers being designed so as to provide a incident-light transmittance depending on an incident angle of an incident light and designed such that a shielded light is not absorbed but reflected, wherein at least one layer of the reflective polarizer (a) is a circular polarization type reflective polarizer (a1) capable of transmitting a certain circularly polarized light and selectively reflecting an oppositely circularly polarized light; at least one layer of the reflective polarizer (a) is a linear polarization type reflective polarizer (a2) capable of transmitting one of perpendicular linearly polarized lights and selectively reflecting the other of the perpendicular linearly polarized lights; and the retardatiType: ApplicationFiled: January 7, 2009Publication date: May 21, 2009Applicant: NITTO DENKO CORPORATIONInventors: Naoki Takahashi, Kentarou Takeda, Kazutaka Hara, Miki Shiraogawa
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Publication number: 20090128905Abstract: An optical element of the invention comprises at least two laminated layers of at least one kind of reflective polarizer (a); and at least one layer of at least one kind of retardation layer (b) for changing polarization properties laminated between the reflective polarizers (a), the combination of the layers being designed so as to provide a incident-light transmittance depending on an incident angle of an incident light and designed such that a shielded light is not absorbed but reflected, wherein at least one layer of the reflective polarizer (a) is a circular polarization type reflective polarizer (a1) capable of transmitting a certain circularly polarized light and selectively reflecting an oppositely circularly polarized light; at least one layer of the reflective polarizer (a) is a linear polarization type reflective polarizer (a2) capable of transmitting one of perpendicular linearly polarized lights and selectively reflecting the other of the perpendicular linearly polarized lights; and the retardatiType: ApplicationFiled: January 7, 2009Publication date: May 21, 2009Applicant: NITTO DENKO CORPORATIONInventors: Naoki Takahashi, Kentarou Takeda, Kazutaka Hara, Miki Shiraogawa
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Patent number: 7492516Abstract: An optical element of the invention comprises at least two laminated layers of reflective polarizer; and at least one retardation layer for changing polarization properties laminated between the reflective polarizers, the combination of the layers being designed so as to provide a incident-light transmittance depending on an incident angle of an incident light and designed such that a shielded light is not absorbed but reflected. The optical element can effectively shield transmitted lights with respect to obliquely incident lights and can control coloring.Type: GrantFiled: March 19, 2004Date of Patent: February 17, 2009Assignee: Nitto Denko CorporationInventors: Naoki Takahashi, Kentarou Takeda, Kazutaka Hara, Miki Shiraogawa
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Patent number: 7326451Abstract: A rotatory polarization plate capable of extracting an emission polarized light from an incident polarized light and rotating an azimuth angle of an polarization axis of the incident polarized light, wherein a rotatory polarization angle of the azimuth angle is changed by an incidence angle of the incident polarized light, is useful for an optical element capable of condensing and collimating incident light from a light source in a specific direction.Type: GrantFiled: October 21, 2004Date of Patent: February 5, 2008Assignee: Nitto Denko CorporationInventors: Kentarou Takeda, Kazutaka Hara, Naoki Takahashi, Miki Shiraogawa
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Publication number: 20070132914Abstract: An optical element comprising: a polarizing element (A), separating incident light into polarization to then emit light, and made of a cholesteric liquid crystal, and a linearly polarized light reflection polarizer (B) transmitting linearly polarized light with one polarization axis and selectively reflecting linearly polarized light with the other polarization axis perpendicular to the one polarization axis, wherein the polarizing element (A) has a distortion rate with respect to emitting light to incident light in the normal direction of 0.5 or more and a distortion rate with respect to emitting light to incident light at an angle inclined from the normal direction by 60 degrees or more of 0.2 or less, the polarizing element (A) has a function increasing a linearly polarized light component of emitting light as incidence angle is larger; is capable of condensation and collimation of incident light from a light source and capable of suppressing transmission of light in an arbitrary direction.Type: ApplicationFiled: August 24, 2004Publication date: June 14, 2007Applicant: Nitto Denko CorporationInventors: Naoki Takahashi, Kazutaka Hara, Miki Shiraogawa, Kentarou Takeda
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Publication number: 20070064168Abstract: An optical element comprising: a polarizing element (A), separating incident light into polarization to then emit light, and made of a cholesteric liquid crystal, wherein the polarizing element (A) has a distortion rate with respect to emitting light to incident light in the normal direction of 0.5 or more and a distortion rate with respect to emitting light to incident light at an angle inclined from the normal direction by 60 degrees or more of 0.Type: ApplicationFiled: August 24, 2004Publication date: March 22, 2007Applicant: NITTO DENKO CORPORATIONInventors: Miki Shiraogawa, Kentarou Takeda, Kazutaka Hara, Naoki Takahashi
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Publication number: 20070014127Abstract: A light source comprising sidelight type backlight light guide plate (L), wherein a transmittance angle dependent layer (T1) which transmits normally incident light and reflects obliquely incident light is disposed on one surface of the sidelight type backlight light guide plate (L), and a reflection plate (R) having a repetitive slope structure is disposed on the other surface of the sidelight type backlight light guide plate (L). The invention light source is less in absorption loss due to repetition of light reflection and the like.Type: ApplicationFiled: August 20, 2004Publication date: January 18, 2007Applicant: Nitto Denko CorporationInventors: Kazutaka Hara, Naoki Takahashi, Kentarou Takeda, Miki Shiraogawa
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Publication number: 20060262401Abstract: An optical element of the invention comprises at least two laminated layers of at least one kind of reflective polarizer (a); and at least one layer of at least one kind of retardation layer (b) for changing polarization properties laminated between the reflective polarizers (a), the combination of the layers being designed so as to provide a incident-light transmittance depending on an incident angle of an incident light and designed such that a shielded light is not absorbed but reflected, wherein at least one layer of the reflective polarizer (a) is a circular polarization type reflective polarizer (a1) capable of transmitting a certain circularly polarized light and selectively reflecting an oppositely circularly polarized light; at least one layer of the reflective polarizer (a) is a linear polarization type reflective polarizer (a2) capable of transmitting one of perpendicular linearly polarized lights and selectively reflecting the other of the perpendicular linearly polarized lights; and the retardatiType: ApplicationFiled: March 19, 2004Publication date: November 23, 2006Applicant: NITTO DENKO CORPORATIONInventors: Naoki Takahashi, Kantarou Takeda, Kazutaka Hara, Miki Shiraogawa
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Publication number: 20060209238Abstract: A cholesteric liquid crystal film of the invention consist of a single layer, which is a cholesteric liquid crystal film, formed by applying a liquid crystal mixture containing a polymerizable mesogen compound (A) and a polymerizable chiral agent (B) to an alignment substrate, and applying ultraviolet irradiation to the mixture, wherein a cholesteric liquid crystal film has at least two independent selective reflection wavelength bands. The cholesteric liquid crystal film can be prepared by a simple and easy procedure.Type: ApplicationFiled: April 15, 2004Publication date: September 21, 2006Inventors: Miki Shiraogawa, Kazutaka Hara, Takahiro Fukuoka
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Publication number: 20060108063Abstract: A sheet with anti-counterfeit functions for making counterfeiting highly difficult in the case where authentication information is recorded using the properties of cholesteric liquid crystal is provided. A cholesteric liquid crystal layer 110 having a selective reflected wavelength band in at least the visible light region is provided in such a manner that this cholesteric liquid crystal layer 110 is a single layer of which thickness is approximately uniform, and an authentication region 112 of which selective reflected wavelength band is different is provided in at least one place. Preferably, an adhesive layer 130 is provided on one side of the cholesteric liquid crystal layer 110. Preferably, a base 120 is provided between the cholesteric liquid crystal layer 110 and the adhesive layer 130. Preferably, a light absorbing layer 140 is provided on adhesive layer 130 of the cholesteric liquid crystal layer 110.Type: ApplicationFiled: November 17, 2005Publication date: May 25, 2006Applicant: NITTO DENKO CORPORATIONInventors: Seiji Umemoto, Miki Shiraogawa, Takahiro Fukuoka, Naoki Takahashi, Kentarou Takeda
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Patent number: 7011775Abstract: A liquid crystal orientation film, which is formed of a liquid crystal polymer, having a satisfactory orientation property is obtained by a method for manufacturing a liquid crystal orientation film, comprising the steps; coating a polymerizable liquid crystal monomer on an orientation substrate; orienting said polymerizable liquid crystal monomer in a state of liquid crystal; polymerizing said polymerizable liquid crystal monomer to form a liquid crystal orientation layer (1); coating a liquid crystal polymer on said liquid crystal orientation layer (1); and orienting said liquid crystal polymer in a state of liquid crystal to form a liquid crystal orientation layer (2).Type: GrantFiled: February 10, 2003Date of Patent: March 14, 2006Assignee: Nitto Denko CorporationInventors: Hironori Motomura, Ikuo Kawamoto, Miki Shiraogawa