Patents by Inventor Ikuko Ebihara
Ikuko Ebihara 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: 7717564Abstract: A projection system includes a light source producing illumination light, an imager disposed to receive the illumination light, and a projection lens disposed to receive the illumination light from the imager. The imager includes an intrinsic polarizer. The intrinsic polarizer can be an intrinsic polarizer stack including a U.V. curable adhesive.Type: GrantFiled: May 21, 2008Date of Patent: May 18, 2010Assignee: Seiko Epson CorporationInventors: Philip J. Ralli, Pradnya V. Nagarkar, James N. Gordon, Ikuko Ebihara, Charles L. Bruzzone, Giorgio B. Trapani
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Publication number: 20080218698Abstract: A projection system including an intrinsic polarizer is disclosed. The projection system includes a light source producing illumination light, an imager disposed to receive the illumination light, and a projection lens disposed to receive the illumination light from the imager. The imager includes an intrinsic polarizer. An intrinsic polarizer stack including a U.V. curable adhesive is also disclosed.Type: ApplicationFiled: May 21, 2008Publication date: September 11, 2008Inventors: PHILIP J. RALLI, Pradnya V. Nagarkar, James N. Gordon, Ikuko Ebihara, Charles L. Bruzzone, Giorgio B. Trapani
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Patent number: 7391569Abstract: A projection system including an intrinsic polarizer is disclosed. The projection system includes a light source producing illumination light, an imager disposed to receive the illumination light, and a projection lens disposed to receive the illumination light from the imager. The imager includes an intrinsic polarizer. An intrinsic polarizer stack including a U.V. curable adhesive is also disclosed.Type: GrantFiled: May 18, 2005Date of Patent: June 24, 2008Assignee: 3M Innovative Properties CompanyInventors: Philip J. Ralli, Pradnya V. Nagarkar, James N. Gordon, Ikuko Ebihara, Charles L. Bruzzone, Giorgio B. Trapani
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Patent number: 7298442Abstract: An optical body includes a) first particles comprising a first cholesteric liquid crystal material and b) a second cholesteric liquid crystal material. The first particles and the second cholesteric liquid crystal material form a structure where the first cholesteric liquid crystal material has a pitch that is different than the second cholesteric liquid crystal material. In one example, the second cholesteric liquid crystal material is in the form of second particles. In another example, the first particles are dispersed in a matrix of the second cholesteric liquid crystal material. In other examples, the optical body has more than one layer. In addition, one or more additional cholesteric liquid crystal materials can be used in the optical body. These optical bodies can be used as a reflective polarizer and can be used in a display.Type: GrantFiled: February 24, 2005Date of Patent: November 20, 2007Assignee: 3M Innovative Properties CompanyInventors: Christopher C. Bowley, Ikuko Ebihara, Gregory Edward Gilligan, Richard John Pokorny, Marc Dudley Radcliffe, Prabhakara Satyauolu Rao, Philip Edwin Watson
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Patent number: 7277141Abstract: An optical body includes a substrate and a cholesteric liquid crystal layer disposed on the substrate. The cholesteric liquid crystal layer has a non-uniform pitch along a thickness direction of the layer and comprises a crosslinked polymer material that substantially fixes the cholesteric liquid crystal layer. The crosslinking hinders diffusion of cholesteric liquid crystal material within the cholesteric liquid crystal layer. In other methods of making an optical body, a reservoir of chiral material is provided during the process over a first cholesteric liquid crystal layer to diffuse into the layer and provide a non-uniform pitch. Alternatively, two coating compositions can be disposed on a substrate where the material of the first coating composition is not substantially soluble in the second coating composition.Type: GrantFiled: May 31, 2005Date of Patent: October 2, 2007Assignee: 3M Innovative Properties CompanyInventors: Richard J. Pokorny, Marc D. Radcliffe, Philip E. Watson, Christopher C. Bowley, Ikuko Ebihara
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Publication number: 20060197903Abstract: An optical body includes a substrate and a cholesteric liquid crystal layer disposed on the substrate. The cholesteric liquid crystal layer has a non-uniform pitch along a thickness direction of the layer and comprises a crosslinked polymer material that substantially fixes the cholesteric liquid crystal layer. The crosslinking hinders diffusion of cholesteric liquid crystal material within the cholesteric liquid crystal layer. In other methods of making an optical body, a reservoir of chiral material is provided during the process over a first cholesteric liquid crystal layer to diffuse into the layer and provide a non-uniform pitch. Alternatively, two coating compositions can be disposed on a substrate where the material of the first coating composition is not substantially soluble in the second coating composition.Type: ApplicationFiled: May 31, 2005Publication date: September 7, 2006Inventors: Richard Pokorny, Marc Radcliffe, Philip Watson, Christopher Bowley, Ikuko Ebihara
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Publication number: 20060139574Abstract: A projection system including an intrinsic polarizer is disclosed. The projection system includes a light source producing illumination light, an imager disposed to receive the illumination light, and a projection lens disposed to receive the illumination light from the imager. The imager includes an intrinsic polarizer. An intrinsic polarizer stack including a U.V. curable adhesive is also disclosed.Type: ApplicationFiled: May 18, 2005Publication date: June 29, 2006Inventors: Philip Ralli, Pradnya Nagarkar, James Gordon, Ikuko Ebihara, Charles Bruzzone, Giorgio Trapani
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Patent number: 6917399Abstract: An optical body includes a substrate and a cholesteric liquid crystal layer disposed on the substrate. The cholesteric liquid crystal layer has a non-uniform pitch along a thickness direction of the layer and comprises a crosslinked polymer material that substantially fixes the cholesteric liquid crystal layer. The crosslinking hinders diffusion of cholesteric liquid crystal material within the cholesteric liquid crystal layer. In other methods of making an optical body, a reservoir of chiral material is provided during the process over a first cholesteric liquid crystal layer to diffuse into the layer and provide a non-uniform pitch. Alternatively, two coating compositions can be disposed on a substrate where the material of the first coating composition is not substantially soluble in the second coating composition.Type: GrantFiled: February 22, 2001Date of Patent: July 12, 2005Assignee: 3M Innovative Properties CompanyInventors: Richard John Pokorny, Marc Dudley Radcliffe, Philip Edwin Watson, Christopher Chadwick Bowley, Ikuko Ebihara
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Publication number: 20050140918Abstract: An optical body includes a) first particles comprising a first cholesteric liquid crystal material and b) a second cholesteric liquid crystal material. The first particles and the second cholesteric liquid crystal material form a structure where the first cholesteric liquid crystal material has a pitch that is different than the second cholesteric liquid crystal material. In one example, the second cholesteric liquid crystal material is in the form of second particles. In another example, the first particles are dispersed in a matrix of the second cholesteric liquid crystal material. In other examples, the optical body has more than one layer. In addition, one or more additional cholesteric liquid crystal materials can be used in the optical body. These optical bodies can be used as a reflective polarizer and can be used in a display.Type: ApplicationFiled: February 24, 2005Publication date: June 30, 2005Inventors: Christopher Bowley, Ikuko Ebihara, Gregory Gilligan, Richard Pokorny, Marc Radcliffe, Prabhakara Rao, Philip Watson
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Patent number: 6876427Abstract: An optical body includes a) first particles comprising a first cholesteric liquid crystal material and b) a second cholesteric liquid crystal material. The first particles and the second cholesteric liquid crystal material form a structure where the first cholesteric liquid crystal material has a pitch that is different than the second cholesteric liquid crystal material. In one example, the second cholesteric liquid crystal material is in the form of second particles. In another example, the first particles are dispersed in a matrix of the second cholesteric liquid crystal material. In other examples, the optical body has more than one layer. In addition, one or more additional cholesteric liquid crystal materials can be used in the optical body. These optical bodies can be used as a reflective polarizer and can be used in a display.Type: GrantFiled: September 21, 2001Date of Patent: April 5, 2005Assignee: 3M Innovative Properties CompanyInventors: Christopher C. Bowley, Ikuko Ebihara, Gregory Edward Gilligan, Richard John Pokorny, Marc Dudley Radcliffe, Prabhakara Satyauolu Rao, Philip Edwin Watson
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Patent number: 6624936Abstract: A polarizer has low color shift and is particularly well suited to use in an LCD display. The polarizer has a double pass color shift of |&Dgr;x|≦0.005 and |&Dgr;y|≦0.005 for illumination by a C-illuminant, and a double pass contrast modulation of at least 90%. The display includes two or more layers stacked together, at least one of the layers being an absorbing polarizer having a double pass color shift of |&Dgr;x|≦0.005 and |&Dgr;y|≦0.005 for illumination by a C-illuminant. A polarizer with a selected color shift is also used with a rear projection screen having a dispersing layer stacked together with first absorbing polarizer. The polarizer has a single pass color shift with at least one of &Dgr;x and &Dgr;y being negative under illumination by a C-illuminant, and a polarization co-efficiency greater than 90%.Type: GrantFiled: May 10, 2001Date of Patent: September 23, 2003Assignee: 3M Innovative Properties CompanyInventors: Keith M. Kotchick, Ikuko Ebihara, Gregory E. Gilligan
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Patent number: 6521732Abstract: A (meth)acrylate terpolymer comprising 1-30% of total terpolymer weight epoxy-functional (meth)acrylate monomer units, 1-98% of total terpolymer weight tackifier (meth)acrylate monomer units, and 1-98% of total terpolymer weight compatibilizing (meth)acrylate monomer units, wherein the compatibilizing (meth)acrylate monomer unit is a (meth)acrylic ester derived from an aromatic alcohol containing 6-14 carbon atoms. Also provided are self-fixturing adhesive compositions comprising the acrylate terpolymer of the present invention and methods of their use.Type: GrantFiled: April 5, 2001Date of Patent: February 18, 2003Assignee: 3M Innovative Properties CompanyInventors: Mario Alberto Perez, Ahmed Salih Abuelyaman, Ikuko Ebihara, Lani S. Kangas
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Publication number: 20020159019Abstract: An optical body includes a substrate and a cholesteric liquid crystal layer disposed on the substrate. The cholesteric liquid crystal layer has a non-uniform pitch along a thickness direction of the layer and comprises a crosslinked polymer material that substantially fixes the cholesteric liquid crystal layer. The crosslinking hinders diffusion of cholesteric liquid crystal material within the cholesteric liquid crystal layer. In other methods of making an optical body, a reservoir of chiral material is provided during the process over a first cholesteric liquid crystal layer to diffuse into the layer and provide a non-uniform pitch. Alternatively, two coating compositions can be disposed on a substrate where the material of the first coating composition is not substantially soluble in the second coating composition.Type: ApplicationFiled: February 22, 2001Publication date: October 31, 2002Inventors: Richard John Pokorny, Marc Dudley Radcliffe, Philip Edwin Watson, Christopher Chadwick Bowley, Ikuko Ebihara
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Publication number: 20020110685Abstract: A tie layer film, comprising an admixture of polyvinyl alcohol and a water dispersible polyester, for bonding a support film to a topcoat layer. The preferred tie layer comprises a sulfopolyester, preferably including terephthalate groups or isophthalate groups. Most preferred are sulfopolyesters produced from ingredients comprising monomers selected from the group consisting of dimethyl 5-sodiosulfoisophthalate, dimethyl terephthalate, dimethyl isophthalate, ethylene glycol, and polycaprolactone diol. Alternatively the support film may be a layered film. In a preferred embodiment, the topcoat layer is formed from the same PVA material as the tie layer and the support film includes at least a portion of the same sulfopolyester as the tie layer. The tie layer is capable of maintaining the bond between the support film and the topcoat layer when heat stretched to a stretch ratio in the range of 2 times to 10 times its original dimension.Type: ApplicationFiled: February 9, 2001Publication date: August 15, 2002Inventors: Ikuko Ebihara, Guy M. Kallman, Gregory E. Gilligan, William L. Kausch, Brian H. Williams, Robert W. Horn
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Publication number: 20010055153Abstract: A polarizer has low color shift and is particularly well suited to use in an LCD display. The polarizer has a double pass color shift of |&Dgr;x|≦0.005 and |&Dgr;y|≦0.005 for illumination by a C-illuminant, and a double pass contrast modulation of at least 90%. The display includes two or more layers stacked together, at least one of the layers being an absorbing polarizer having a double pass color shift of |&Dgr;x|≦0.005 and |&Dgr;y|≦0.005 for illumination by a C-illuminant. A polarizer with a selected color shift is also used with a rear projection screen having a dispersing layer stacked together with first absorbing polarizer. The polarizer has a single pass color shift with at least one of &Dgr;x and &Dgr;y being negative under illumination by a C-illuminant, and a polarization co-efficiency greater than 90%.Type: ApplicationFiled: May 10, 2001Publication date: December 27, 2001Applicant: 3M Innovative Properties CompanyInventors: Robert S. Moshrefzadeh, Keith M. Kotchick, Ikuko Ebihara, Gregory E. Gilligan
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Publication number: 20010031837Abstract: A (meth)acrylate terpolymer is provided comprising 1-30% of total terpolymer weight epoxy-functional (meth)acrylate monomer units, 1-98% of total terpolymer weight tackifier (meth)acrylate monomer units, and 1-98% of total terpolymer weight compatibilizing (meth)acrylate monomer units, wherein said compatibilizing (meth)acrylate monomer unit is a (meth)acrylic ester derived from an aromatic alcohol containing 6-14 carbon atoms. Also provided are self-fixturing adhesive compositions comprising the acrylate terpolymer of the present invention and methods of their use.Type: ApplicationFiled: April 5, 2001Publication date: October 18, 2001Applicant: 3M Innovative Properties CompanyInventors: Mario Alberto Perez, Ahmed Salih Abuelyaman, Ikuko Ebihara, Lani S. Kangas
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Patent number: 6235850Abstract: A (meth)acrylate terpolymer is provided comprising 1-30% of total terpolymer weight epoxy-functional (meth)acrylate monomer units, 1-98% of total terpolymer weight tackifier (meth)acrylate monomer units, and 1-98% of total terpolymer weight compatibilizing (meth)acrylate monomer units, wherein said compatibilizing (meth)acrylate monomer unit is a (meth)acrylic ester derived from an aromatic alcohol containing 6-14 carbon atoms. Also provided are self-fixturing adhesive compositions comprising the acrylate terpolymer of the present invention and methods of their use.Type: GrantFiled: December 11, 1998Date of Patent: May 22, 2001Assignee: 3M Immovative Properties CompanyInventors: Mario Alberto Perez, Ahmed Salih Abuelyaman, Ikuko Ebihara, Lani S. Kangas