Patents by Inventor Takami Hikita
Takami Hikita 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: 10852455Abstract: A laminate of optical elements comprises a transparent first optical element, a second optical element, and a transparent pressure-sensitive adhesive layer for bonding the first optical element to the second optical element. The pressure-sensitive adhesive layer comprises a base adhesive zone, a transparent refractive index-adjusting zone. The base adhesive zone is made essentially of a transparent base pressure-sensitive adhesive material and formed over a given range from a first principal surface of the pressure-sensitive adhesive layer facing the first optical element, in a thickness direction of the pressure-sensitive adhesive layer. The a transparent, adherent, refractive index-adjusting zone is formed over a given range from a second principal surface of the pressure-sensitive adhesive layer facing the second optical element.Type: GrantFiled: January 16, 2015Date of Patent: December 1, 2020Assignee: NITTO DENKO CORPORATIONInventors: Toru Umemoto, Hirofumi Katami, Hiroyuki Takao, Takahiro Nonaka, Atsushi Yasui, Takami Hikita
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Patent number: 10613263Abstract: There is provided a circularly polarizing plate for an organic EL display apparatus, which has an excellent antireflection function and has an excellent organic EL panel-protecting function. A circularly polarizing plate according to the present invention is used in an organic EL display apparatus. The circularly polarizing plate includes in this order: a polarizer; a retardation layer functioning as a ?/4 plate; a barrier layer; and a pressure-sensitive adhesive layer having a barrier function. An angle formed between an absorption axis of the polarizer and a slow axis of the retardation layer is from 35° to 55°.Type: GrantFiled: January 3, 2019Date of Patent: April 7, 2020Assignee: NITTO DENKO CORPORATIONInventors: Takeshi Murashige, Youichirou Sugino, Takami Hikita, Hiroyuki Takemoto, Mariko Hirai
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Patent number: 10527882Abstract: There is provided an optical laminate capable of toeing suitably applied even to an organic EL display apparatus that is extremely thin and is bendable or foldable. An optical laminate according to an embodiment of the present invention is used for an organic electroluminescence display apparatus. The optical laminate includes in this order: a surface protective layer; a polarizer; and an optical compensation layer. The surface protective layer is flexible, has a function of substituting for a cover glass for an organic electroluminescence display apparatus, and functions as a protective layer for the polarizer.Type: GrantFiled: November 16, 2016Date of Patent: January 7, 2020Assignee: NITTO DENKO CORPORATIONInventors: Takami Hikita, Kentarou Takeda, Tomonori Ueno, Atsushi Kishi
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Patent number: 10520656Abstract: There is provided a circularly polarizing plate for an organic EL display apparatus, which has an excellent antireflection function and has an excellent organic EL panel-protecting function. A circularly polarizing plate according to the present invention is used in an organic EL display apparatus. The circularly polarizing plate includes in this order: a polarizer; a retardation layer functioning as a ?/4 plate; a barrier layer; and a pressure-sensitive adhesive layer having a barrier function. An angle formed between an absorption axis of the polarizer and a slow axis of the retardation layer is from 35° to 55°.Type: GrantFiled: November 18, 2015Date of Patent: December 31, 2019Assignee: NITTO DENKO CORPORATIONInventors: Takeshi Murashige, Youichirou Sugino, Takami Hikita, Hiroyuki Takemoto, Mariko Hirai
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Publication number: 20190391312Abstract: There is provided an optical laminate capable of being suitably applied even to an organic EL display apparatus that is extremely thin and is bendable or foldable. An optical laminate according to an embodiment of the present invention is used for an organic electroluminescence display apparatus. The optical laminate includes in this order: a surface protective layer; a polarizer; and an optical compensation layer. The surface protective layer is flexible, has a function of substituting for a cover glass for an organic electroluminescence display apparatus, and functions as a protective layer for the polarizer.Type: ApplicationFiled: September 5, 2019Publication date: December 26, 2019Applicant: NITTO DENKO CORPORATIONInventors: Takami Hikita, Kentarou Takeda, Tomonori Ueno, Atsushi Kishi
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Publication number: 20190154899Abstract: There is provided a circularly polarizing plate for an organic EL display apparatus, which has an excellent antireflection function and has an excellent organic EL panel-protecting function. A circularly polarizing plate according to the present invention is used in an organic EL display apparatus. The circularly polarizing plate includes in this order: a polarizer; a retardation layer functioning as a ?/4 plate; a barrier layer; and a pressure-sensitive adhesive layer having a barrier function. An angle formed between an absorption axis of the polarizer and a slow axis of the retardation layer is from 35° to 55°.Type: ApplicationFiled: January 3, 2019Publication date: May 23, 2019Applicant: NITTO DENKO CORPORATIONInventors: Takeshi Murashige, Youichirou Sugino, Takami Hikita, Hiroyuki Takemoto, Mariko Hirai
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Publication number: 20180329125Abstract: There is provided an optical laminate capable of toeing suitably applied even to an organic EL display apparatus that is extremely thin and is bendable or foldable. An optical laminate according to an embodiment of the present invention is used for an organic electroluminescence display apparatus. The optical laminate includes in this order: a surface protective layer; a polarizer; and an optical compensation layer The surface protective layer is flexible, has a function of substituting for a cover glass for an organic electroluminescence display apparatus, and functions as a protective layer for the polarizer.Type: ApplicationFiled: November 16, 2016Publication date: November 15, 2018Applicant: NITTO DENKO CORPORATIONInventors: Takami HIKITA, Kentarou TAKEDA, Tomonori UENO, Atsushi KISHI
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Publication number: 20180284332Abstract: There is provided a circularly polarizing plate for an organic EL display apparatus, which has an excellent antireflection function and has an excellent organic EL panel-protecting function. A circularly polarizing plate according to the present invention is used in an organic EL display apparatus. The circularly polarizing plate includes in this order: a polarizer; a retardation layer functioning as a ?/4 plate; a barrier layer; and a pressure-sensitive adhesive layer having a barrier function. An angle formed between an absorption axis of the polarizer and a slow axis of the retardation layer is from 35° to 55°.Type: ApplicationFiled: November 18, 2015Publication date: October 4, 2018Applicant: NITTO DENKO CORPORATIONInventors: Takeshi Murashige, Youichirou Sugino, Takami Hikita, Hiroyuki Takemoto, Mariko Hirai
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Patent number: 10072184Abstract: A pressure-sensitive adhesive sheet comprises a support and a transparent pressure-sensitive adhesive layer on the support. The pressure-sensitive adhesive layer comprises a base adhesive zone made essentially of a transparent base pressure-sensitive adhesive material and formed over a given range from a first principal surface of the pressure-sensitive adhesive layer in a thickness direction of the pressure-sensitive adhesive layer, and a transparent, adherent, refractive index-adjusting zone formed over a given range from a second principal surface of the pressure-sensitive adhesive layer in the thickness direction, and wherein the refractive index-adjusting zone has a refractive index greater than a refractive index of the base pressure-sensitive adhesive material.Type: GrantFiled: January 16, 2015Date of Patent: September 11, 2018Assignee: NITTO DENKO CORPORATIONInventors: Hirofumi Katami, Toru Umemoto, Hiroyuki Takao, Takahiro Nonaka, Atsushi Yasui, Takami Hikita
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Publication number: 20180155511Abstract: A laminate roll that is an elongated laminate wound in a form of a roll, wherein the laminate includes a transparent electrically conductive film including a polycycloolefin film and a transparent electrically conductive layer, and inclination of the direction of the slow axis of the polycycloolefin film with respect to the longitudinal direction of the elongated laminate falls within a range of±2° over the entire elongated laminate except opposite end portions thereof each of which accounts for 5% of the entire width of the elongated laminate.Type: ApplicationFiled: April 14, 2016Publication date: June 7, 2018Inventors: Kentaro TAKEDA, Naoki TSUNO, Hidehiko ANDO, Akinori NISHIMURA, Takami HIKITA
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Publication number: 20160115357Abstract: A pressure-sensitive adhesive sheet comprises a support and a transparent pressure-sensitive adhesive layer on the support. The pressure-sensitive adhesive layer comprises a base adhesive zone made essentially of a transparent base pressure-sensitive adhesive material and formed over a given range from a first principal surface of the pressure-sensitive adhesive layer in a thickness direction of the pressure-sensitive adhesive layer, and a transparent, adherent, refractive index-adjusting zone formed over a given range from a second principal surface of the pressure-sensitive adhesive layer in the thickness direction, and wherein the refractive index-adjusting zone has a refractive index greater than a refractive index of the base pressure-sensitive adhesive material.Type: ApplicationFiled: January 16, 2015Publication date: April 28, 2016Inventors: Hirofumi KATAMI, Toru UMEMOTO, Hiroyuki TAKAO, Takahiro NONAKA, Atsushi YASUI, Takami HIKITA
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Publication number: 20160084991Abstract: A laminate of optical elements comprises a transparent first optical element, a second optical element, and a transparent pressure-sensitive adhesive layer for bonding the first optical element to the second optical element. The pressure-sensitive adhesive layer comprises a base adhesive zone, a transparent refractive index-adjusting zone. The base adhesive zone is made essentially of a transparent base pressure-sensitive adhesive material and formed over a given range from a first principal surface of the pressure-sensitive adhesive layer facing the first optical element, in a thickness direction of the pressure-sensitive adhesive layer. The a transparent, adherent, refractive index-adjusting zone is formed over a given range from a second principal surface of the pressure-sensitive adhesive layer facing the second optical element.Type: ApplicationFiled: January 16, 2015Publication date: March 24, 2016Inventors: Toru UMEMOTO, Hirofumi KATAMI, Hiroyuki TAKAO, Takahiro NONAKA, Atsushi YASUI, Takami HIKITA
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Publication number: 20160002505Abstract: The pressure sensitive adhesive of the present invention includes an acryl-based base polymer and a hydrogenated terpene phenolic resin having a softening point of 70° C. to 150° C. The hydrogenated terpene phenolic resin preferably has a terpene molar ratio of 0.1 to 0.7. The content of acryl-based base polymer is preferably 45 to 95 parts by weight based on total 100 parts by weight of the pressure sensitive adhesive composition. In addition, total content of the acryl-based base polymer and the hydrogenated terpene phenolic resin is preferably 70 parts by weight or more. The pressure sensitive adhesive of the present invention is hardly clouded even under a high-temperature and high-humidity environment, and has level difference followability, thus can be used by disposing between a front transparent plate and a touch panel, between a front transparent plate and an image display panel or between a touch panel and an image display panel.Type: ApplicationFiled: March 12, 2014Publication date: January 7, 2016Applicant: NITTO DENKO CORPORATIONInventors: Masaki MIZUTANI, Yuki HASEGAWA, Yusuke MOTEGI, Shou TAKARADA, Shinya YAMAMOTO, Takami HIKITA
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Patent number: 9034566Abstract: A resin composition for forming an optical waveguide brings together excellent bending resistance, a low refractive index, and low tackiness suitable for a roll-to-roll (R-to-R) process as a material for forming an optical waveguide, in particular, a material for forming a clad layer. The resin composition for forming an optical waveguide to be used in formation of an optical waveguide includes a polyvinyl acetal compound having a structural unit represented by the following general formula (1) as a main component: in the formula (1), R represents an alkyl group having 1 to 3 carbon atoms, and k, m, and n represent ratios of respective repeating units in a main chain and each represent an integer of 1 or more.Type: GrantFiled: December 20, 2012Date of Patent: May 19, 2015Assignee: NITTO DENKO CORPORATIONInventors: Tomoyuki Hirayama, Takami Hikita
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Patent number: 8538220Abstract: A manufacturing method of an optical waveguide device and an optical waveguide device obtained thereby. An under cladding layer is formed on the front surface of a colored-layer-coated PET substrate including a PET substrate portion and a colored layer of a color that absorbs irradiation light and formed on the back surface of the PET substrate portion, and then a photosensitive resin layer for the formation of cores is formed thereon. In forming the cores, when the irradiation light reaches the bottom surface of the PET substrate portion, most of the irradiation light is absorbed by the colored layer, so that there is little irradiation light reflected from the bottom surface of the PET substrate portion. This significantly reduces the irradiation light reflected diffusely from the PET substrate portion and reaching the photosensitive resin layer to thereby effectively suppress the surface roughening of the side surfaces of the cores.Type: GrantFiled: September 18, 2009Date of Patent: September 17, 2013Assignee: Nitto Denko CorporationInventors: Takami Hikita, Junichi Fujisawa, Yusuke Shimizu
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Publication number: 20130118788Abstract: A polyimide precursor composition comprises (A), and at least one of (B) and (C), (B) and (C) being present in a proportion of 30-100 parts by weight based on 100 parts by weight of (A): (A) a polyimide precursor comprising: (a1) a unit of formula (1): R1 is a C1-C3 alkyl group connected to an aromatic ring, m is 0 or not greater than 4, and n is 1 to 4; and (a2) a unit of formula (2): (a1) and (a2) are present in a molar ratio of 20/80 to 70/30; (B) a compound of formula (3): R2 is a hydrogen atom or a methyl group, and R3 is a divalent hydrocarbon group having two or more carbon atoms; and (C) a compound of formula (4): R4 is a hydroxyl group or a methoxy group, R5 is a hydrogen atom or a methyl group, and k is 4-23.Type: ApplicationFiled: September 11, 2012Publication date: May 16, 2013Applicant: NITTO DENKO CORPORATIONInventors: Tomoaki Hishiki, Takami Hikita, Takatoshi Sakakura
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Patent number: 8236374Abstract: A method of manufacturing an optical waveguide device is provided which provides the excellent smoothness of a light receiving end surface and a light emitting end surface formed by cutting and which provides excellent productivity. A laminate of a film element (2) and a board (1) is prepared. The film element (2) includes at least one future optical waveguide portion. The board (1) is stacked on the film element (2). The laminate is die-cut from the side of the board (1). This provides an optical waveguide device including the die-cut board (1) and an optical waveguide formed thereon. A cutting die used for the die-cutting includes at least blades (3) for forming the light receiving end surface (20a) and the light emitting end surface (20b) of the optical waveguide. The blades (3) are flat blades including blade surfaces having an arithmetic means roughness (Ra) of less than 0.02 ?m.Type: GrantFiled: March 3, 2009Date of Patent: August 7, 2012Assignee: Nitto Denko CorporationInventor: Takami Hikita
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Patent number: 8187796Abstract: An optical waveguide device is provided which is capable of reducing light propagation losses in the cores of an optical waveguide when the optical waveguide is formed on a surface of a substrate, regardless of the type of substrate. A photosensitive resin layer (4A) for over cladding layer formation is made of a photosensitive resin composition of a non-solvent type, and is heated prior to the exposure thereof to light. This causes interface portions between the cores (3) and the photosensitive resin layer (4A) to be formed into mixed layers (5). This reduces light propagation losses.Type: GrantFiled: July 12, 2010Date of Patent: May 29, 2012Assignee: Nitto Denko CorporationInventors: Takami Hikita, Junichi Fujisawa
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Patent number: 7995895Abstract: A resin composition for an optical waveguide is provided, which comprises: an epoxy compound represented by the following general formula (1): wherein m is 1 or a positive integer, n is 1 or a positive integer, R and R? which may be the same or different are each represented by the following formula (2) or (3), wherein c is a positive integer of 1 to 3 and each one of c may be the same or different, and X is represented by the following formula (4): wherein a is an integer of 0 to 2, and b is a positive integer of 1 to 3, and satisfy a condition of a+b=3; and a photoacid generator. The resin composition has a lower viscosity, and is excellent in flexibility and moisture absorption resistance. An optical waveguide produced by employing the resin composition is also provided.Type: GrantFiled: July 1, 2009Date of Patent: August 9, 2011Assignees: Nitto Denko Corporation, Nippon Steel Chemical Co., Ltd.Inventors: Takami Hikita, Yusuke Shimizu, Kazuo Ishihara
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Patent number: 7957622Abstract: A method of manufacturing an opto-electric hybrid board which is capable of reducing the number of steps for the manufacture of the opto-electric hybrid board and which achieves the reduction in thickness of the opto-electric hybrid board to be manufactured, and an opto-electric hybrid board obtained thereby. A plurality of protruding cores (optical interconnect lines) 3 are formed in a predetermined pattern. Thereafter, a thin metal film 4 is formed in grooves defined between adjacent ones of the cores 3. Electroplating is performed on the thin metal film 4 to fill the above-mentioned grooves with an electroplated layer 6a. The electroplated layer 6a serves as electrical interconnect lines 6.Type: GrantFiled: January 23, 2009Date of Patent: June 7, 2011Assignee: Nitto Denko CorporationInventors: Yusuke Shimizu, Takami Hikita