Patents by Inventor Hiroshi Sumimura
Hiroshi Sumimura 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: 10754065Abstract: An object of the present invention is to provide a retardation film excellent in various properties such as optical properties, heat resistance, mechanical properties, and reliability. The present invention relates to a retardation film containing a thermoplastic resin and composed of a single layer, in which the retardation film has a value of wavelength dispersion that is a ratio of retardations at a wavelength of 450 nm and at a wavelength of 550 nm being 0.75 or more and 0.92 or less; a birefringence at a wavelength of 550 nm and the wavelength dispersion satisfy a relationship of ?n?0.0140×(R450/R550)?0.0082; and a photoelastic coefficient is 25×10?12 Pa?1 or less.Type: GrantFiled: October 14, 2016Date of Patent: August 25, 2020Assignees: NITTO DENKO CORPORATION, Mitsubishi Chemical CorporationInventors: Shingo Namiki, Yuuichi Hirami, Hisatoshi Uehara, Hiroyuki Hayashi, Takashi Shimizu, Hiroshi Sumimura, Nao Murakami
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Patent number: 10732323Abstract: The retardation film of the present invention contains a resin having positive refractive index anisotropy and containing at least one bonding group of a carbonate bond and an ester bond and one or more structural units selected from the group consisting of a structural unit represented by the general formula (1) and a structural unit represented by the general formula (2), in which the value of wavelength dispersion (R450/R550) as a ratio of retardation R450 at a wavelength of 450 nm to retardation R550 at a wavelength of 550 nm is more than 0.5 and less than 1.0: (in formula (1) and formula (2), definitions of R1 to R9 are the same as in the description).Type: GrantFiled: October 14, 2016Date of Patent: August 4, 2020Assignees: NITTO DENKO CORPORATION, Mitsubishi Chemical CorporationInventors: Shingo Namiki, Yuuichi Hirami, Hisatoshi Uehara, Hiroyuki Hayashi, Takashi Shimizu, Hiroshi Sumimura, Nao Murakami
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Patent number: 10670773Abstract: The retardation film of the present invention contains a thermoplastic resin and is constituted of a single layer. A value of wavelength dispersion (R450/R550) that is a ratio of a retardation R450 at a wavelength of 450 nm and a retardation R550 at a wavelength of 550 nm is 0.70 or more and 0.85 or less; and a photoelastic coefficient is 14×10?12 Pa?1 or less.Type: GrantFiled: October 14, 2016Date of Patent: June 2, 2020Assignees: NITTO DENKO CORPORATION, Mitsubishi Chemical CorporationInventors: Shingo Namiki, Yuuichi Hirami, Hisatoshi Uehara, Hiroyuki Hayashi, Takashi Shimizu, Hiroshi Sumimura, Nao Murakami
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Publication number: 20190079231Abstract: There is provided an optical laminate that has a conductive layer directly formed on a retardation layer, is extremely thin and has an excellent antireflection function, and further, can realize excellent display characteristics even when it is applied to a bent portion of an image display apparatus. An optical laminate according to an embodiment of the present invention includes: a polarizer; a retardation layer; and a conductive layer, which is directly formed on the retardation layer. The retardation layer has an in-plane retardation Re(550) being from 100 nm to 180 nm and satisfying a relationship of Re(450)<Re(550)<Re(650), and has a glass transition temperature (Tg) of 150° C. or more and an absolute value of a photoelastic coefficient of 20×10?12 (m2/N) or less. An angle formed between a slow axis of the retardation layer and an absorption axis of the polarizer is from 35° to 55°.Type: ApplicationFiled: January 31, 2017Publication date: March 14, 2019Applicants: MITSUBISHI CHEMICAL CORPORATION, NITTO DENKO CORPORATIONInventors: Hiroshi Sumimura, Takashi Shimizu, Shingo Namiki, Yuuichi Hirami
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Patent number: 10107946Abstract: There is provided a thin polarizing plate with a retardation layer excellent in reworkability. A polarizing plate with a retardation layer according to the present invention includes: a polarizing plate including a polarizer and a protective layer on at least one side of the polarizer; a retardation layer; a first adhesive layer configured to bond the polarizing plate and the retardation layer; and a second adhesive layer arranged as an outermost layer on an opposite side of the retardation layer to the polarizing plate. An average linear expansion coefficient of the second adhesive layer when an ambient temperature is changed from ?150° C. to 20° C. is 38.0(×10?5/° C.) or more, and is larger than an average linear expansion coefficient of the first adhesive layer when an ambient temperature is changed from ?150° C. to 20° C.Type: GrantFiled: July 11, 2016Date of Patent: October 23, 2018Assignee: NITTO DENKO CORPORATIONInventors: Takeharu Kitagawa, Tadashi Kojima, Hiroshi Sumimura
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Patent number: 10036840Abstract: There is provided a circularly polarizing plate capable of realizing a bendable display apparatus in which an excellent reflection hue is obtained and a color change due to bending is suppressed. A circularly polarizing plate according to the present invention is used in a bendable display apparatus. The circularly polarizing plate includes: a polarizer; and a retardation film arranged on one side of the polarizer. In-plane retardations of the retardation film satisfy a relationship of Re(450)<Re(550)<Re(650), and a slow axis direction of the retardation film is adjusted so as to form an angle of from 20° to 70° with respect to a bending direction of the display apparatus.Type: GrantFiled: January 29, 2014Date of Patent: July 31, 2018Assignee: NITTO DENKO CORPORATIONInventors: Kentarou Takeda, Hironori Yaginuma, Hiroshi Sumimura, Nao Murakami
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Publication number: 20170031060Abstract: The retardation film of the present invention contains a resin having positive refractive index anisotropy and containing at least one bonding group of a carbonate bond and an ester bond and one or more structural units selected from the group consisting of a structural unit represented by the general formula (1) and a structural unit represented by the general formula (2), in which the value of wavelength dispersion (R450/R550) as a ratio of retardation R450 at a wavelength of 450 nm to retardation R550 at a wavelength of 550 nm is more than 0.5 and less than 1.0: (in formula (1) and formula (2), definitions of R1 to R9 are the same as in the description).Type: ApplicationFiled: October 14, 2016Publication date: February 2, 2017Applicants: NITTO DENKO CORPORATION, Mitsubishi Chemical CorporationInventors: Shingo NAMIKI, Yuuichi HIRAMI, Hisatoshi UEHARA, Hiroyuki HAYASHI, Takashi SHIMIZU, Hiroshi SUMIMURA, Nao MURAKAMI
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Publication number: 20170031062Abstract: The retardation film of the present invention contains a thermoplastic resin and is constituted of a single layer. A value of wavelength dispersion (R450/R550) that is a ratio of a retardation R450 at a wavelength of 450 nm and a retardation R550 at a wavelength of 550 nm is 0.70 or more and 0.85 or less; and a photoelastic coefficient is 14×10?12 Pa?1 or less.Type: ApplicationFiled: October 14, 2016Publication date: February 2, 2017Applicants: NITTO DENKO CORPORATION, Mitsubishi Chemical CorporationInventors: Shingo NAMIKI, Yuuichi HIRAMI, Histatoshi UEHARA, Hiroyuki HAYASHI, Takashi SHIMIZU, Hiroshi SUMIMURA, Nao MURAKAMI
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Publication number: 20170031061Abstract: An object of the present invention is to provide a retardation film excellent in various properties such as optical properties, heat resistance, mechanical properties, and reliability. The present invention relates to a retardation film containing a thermoplastic resin and composed of a single layer, in which the retardation film has a value of wavelength dispersion that is a ratio of retardations at a wavelength of 450 nm and at a wavelength of 550 nm being 0.75 or more and 0.92 or less; a birefringence at a wavelength of 550 nm and the wavelength dispersion satisfy a relationship of ?n?0.0140×(R450/R550)?0.0082; and a photoelastic coefficient is 25×10?12 Pa?1 or less.Type: ApplicationFiled: October 14, 2016Publication date: February 2, 2017Applicants: NITTO DENKO CORPORATION, Mitsubishi Chemical CorporationInventors: Shingo NAMIKI, Yuuichi HIRAMI, Hisatoshi UEHARA, Hiroyuki HAYASHI, Takashi SHIMIZU, Hiroshi SUMIMURA, Nao MURAKAMI
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Publication number: 20170023716Abstract: There is provided a thin polarizing plate with a retardation layer excellent in reworkability. A polarizing plate with a retardation layer according to the present invention includes: a polarizing plate including a polarizer and a protective layer on at least one side of the polarizer; a retardation layer; a first adhesive layer configured to bond the polarizing plate and the retardation layer; and a second adhesive layer arranged as an outermost layer on an opposite side of the retardation layer to the polarizing plate. An average linear expansion coefficient of the second adhesive layer when an ambient temperature is changed from ?150° C. to 20° C. is 38.0(×10?5/° C.) or more, and is larger than an average linear expansion coefficient of the first adhesive layer when an ambient temperature is changed from ?150° C. to 20° C.Type: ApplicationFiled: July 11, 2016Publication date: January 26, 2017Applicant: NITTO DENKO CORPORATIONInventors: Takeharu Kitagawa, Tadashi Kojima, Hiroshi Sumimura
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Publication number: 20150369981Abstract: There is provided a circularly polarizing plate capable of realizing a bendable display apparatus in which an excellent reflection hue is obtained and a color change due to bending is suppressed. A circularly polarizing plate according to the present invention is used in a bendable display apparatus. The circularly polarizing plate includes: a polarizer; and a retardation film arranged on one side of the polarizer. In-plane retardations of the retardation film satisfy a relationship of Re(450)<Re(550)<Re(650), and a slow axis direction of the retardation film is adjusted so as to form an angle of from 20° to 70° with respect to a bending direction of the display apparatus.Type: ApplicationFiled: January 29, 2014Publication date: December 24, 2015Applicant: NITTO DENKO CORPORATIONInventors: Kentarou Takeda, Hironori Yaginuma, Hiroshi Sumimura, Nao Murakami