Patents by Inventor Tsuyoshi Obikawa
Tsuyoshi Obikawa 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: 8144303Abstract: A liquid crystal apparatus includes: a liquid crystal panel having a pair of substrates and including a display area; and a case body having an opening in an area corresponding to the display area of the liquid crystal panel and being attached to the liquid crystal panel, in which the case body includes: a plurality of panel-shaped members having a laminated structure including a clearance in the direction of the thickness of the liquid crystal panel, openings provided at portions on the side of one side of the liquid crystal panel and on the side of the other side thereof opposing the one side corresponding to the clearance, a diaphragm formed in the clearance of the plurality of panel-shaped members from the side of the one side toward the side of the other side.Type: GrantFiled: December 11, 2008Date of Patent: March 27, 2012Assignee: Seiko Epson CorporationInventors: Koichi Terao, Tsuyoshi Obikawa
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Publication number: 20090207327Abstract: A liquid crystal apparatus includes: a liquid crystal panel having a pair of substrates and including a display area; and a case body having an opening in an area corresponding to the display area of the liquid crystal panel and being attached to the liquid crystal panel, in which the case body includes: a plurality of panel-shaped members having a laminated structure including a clearance in the direction of the thickness of the liquid crystal panel, openings provided at portions on the side of one side of the liquid crystal panel and on the side of the other side thereof opposing the one side corresponding to the clearance, a diaphragm formed in the clearance of the plurality of panel-shaped members from the side of the one side toward the side of the other side.Type: ApplicationFiled: December 11, 2008Publication date: August 20, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Koichi TERAO, Tsuyoshi Obikawa
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Patent number: 6650463Abstract: A dispersion medium, for dispersing electrophoretic particles in an electrophoretic display device, contains an organic compound having two or more rings in its structural formula, where the organic compound comprises at least about 30% by weight of the dispersion medium. The thus constituted dispersion medium improves the reliability and response of the electrophoretic device. The organic compound comprises one or more of the materials defined by the structural formulae (1) to (4), wherein each of A1 to A6, C1, and C2 are ring compounds.Type: GrantFiled: March 12, 2002Date of Patent: November 18, 2003Assignee: Seiko Epson CorporationInventors: Tsuyoshi Obikawa, Makoto Katase, Satoshi Kinoshita, Masamitsu Uehara
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Publication number: 20020175891Abstract: A dispersion medium, for dispersing electrophoretic particles in an electrophoretic display device, contains an organic compound having two or more rings in its structural formula, where the organic compound comprises at least about 30% by weight of the dispersion medium. The thus constituted dispersion medium improves the reliability and response of the electrophoretic device. The organic compound comprises one or more of the materials defined by the structural formulae (1) to (4), wherein each of A1 to A6, C1, and C2 are ring compounds.Type: ApplicationFiled: March 12, 2002Publication date: November 28, 2002Inventors: Tsuyoshi Obikawa, Makoto Katase, Satoshi Kinoshita, Masamitsu Uehara
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Patent number: 5354502Abstract: A 1,3-dioxane derivative and a liquid crystal composition containing it as expressed by the general formula ##STR1## (where R is a straight chain alkyl group of carbon number 1 to 10, A is a single bond or --CH.sub.2 CH.sub.2 -- group, n is 0 or 1, and the cyclohexane ring and 1,3-dioxane ring are respectively in trans form is disclosed.) The 1,3-dioxane derivative represented by general formula (I) has a very large dielectric anisotropy and a small birefringence. Liquid crystal compositions containing (I) can be driven at low voltage and will provide a liquid crystal display apparatus with a wide visual angle.Type: GrantFiled: December 8, 1992Date of Patent: October 11, 1994Assignee: Seiko Epson CorporationInventors: Tsuyoshi Obikawa, Shuji Ikukawa, Jitsuko Nakayama
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Patent number: 5238599Abstract: Trans-2-phenyl-5-trans-4'-alkylcyclohexyl-1,3-dioxane derivatives represented by the general formula: ##STR1## wherein R is a linear alkyl group of 1 to 10 carbon atoms, A is a single covalent bond or a --CH.sub.2 CH.sub.2 -- group, X is F or CN, Y is F if X is CN or Y is H or F if X is F, and the cyclohexane ring and the 1,3-dioxane ring are trans isomers. The 1,3-dioxane derivatives have large positive dielectric constant anisotropy (.DELTA..epsilon.), small birefringence (.DELTA.n) and have good compatibility with other liquid crystal compounds. The dioxane derivatives may be included in liquid crystal compositions for improved display devices having a low threshold voltage, a low driving voltage and a wide visual angle.Type: GrantFiled: May 25, 1990Date of Patent: August 24, 1993Assignee: Seiko Epson CorporationInventors: Tsuyoshi Obikawa, Shuji Ikukawa, Jitsuko Nakayama
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Patent number: 5200110Abstract: 2-phenyl-5-(4'-trans-cyclohexyl) phenyl pyrimidine derivatives represented by the general formula: ##STR1## wherein R is a straight chain alkyl group having 1 to 10 carbon atoms; X is CN or F; Y is F or H; Z is F or H; and when X is F, at least one of Y and Z is H; and the cyclohexane ring is a trans isomer, exhibiting a nematic phase and having a high nematic phase-isotropic liquid phase transition temperature (N-I Point) and large positive dielectric constant anisotropy (.DELTA..epsilon.). The pyrimidine derivatives may be included in liquid crystal compositions for improved display devices having a wide temperature range, including a high N-I point, a low threshold voltage and a low driving voltage.Type: GrantFiled: April 15, 1992Date of Patent: April 6, 1993Assignee: Seiko Epson CorporationInventors: Tsuyoshi Obikawa, Shuhei Yamada, Shuji Ikukawa
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Patent number: 5061400Abstract: 2'-fluoro-4"-trans-cyclohexyl-terphenyl derivatives represented by the general formula: ##STR1## wherein the cyclohexyl is the trans isomer, R is a straight chain alkyl having from 1 to 12 carbon atoms, X is a straight chain alkyl having from 1 to 12 carbon atoms, a straight chain alkoxy having from 1 to 12 carbon atoms or --CN and the compounds exhibit the nematic phase. The fluoro-cyclohexyl-terphenyl derivatives have a low crystal-nematic phase transition temperature (C-N point), a high nematic phase-isotropic liquid phase transition temperature (N-I point) and low viscosity and may be included in liquid crystal compositions for improved display devices having a wide temperature range, a low driving voltage and a rapid response speed.Type: GrantFiled: June 27, 1989Date of Patent: October 29, 1991Assignee: Seiko Epson CorporationInventor: Tsuyoshi Obikawa
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Patent number: 5026879Abstract: 2-(3', 4'-difluorophenyl)-1,3-dioxane derivatives represented by the general formula: ##STR1## wherein R is a linear alkyl group having from 1 to 8 atoms, and having large positive dielectric constant anisotropy (.DELTA..epsilon.) and small refractive index anisotropy (.DELTA.n). The dioxane derivatives may be included in liquid crystal compositions for improved display devices having a low threshold voltage, a low driving voltage and a wide visual angle.Type: GrantFiled: March 20, 1990Date of Patent: June 25, 1991Assignee: Seiko Epson CorporationInventor: Tsuyoshi Obikawa
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Patent number: 4879060Abstract: 2-phenylpyridine derivatives represented by the general formula: ##STR1## wherein when Y is R--, Z is one of R--, RO--, ##STR2## when Y is RO--, Z is one of straight chain pentyl, ##STR3## and when Y is one of Z is one of R--, RO-- and --CN; when Y is --CN, Z is one of RO--, ##STR4## and R is a straight chain alkyl group from 1 to 12 carbon atoms, are disclosed. The 2-phenylpyridine derivatives in accordance with the invention are particularly well-suited for use in nematic liquid crystal compositions for reducing the steepness and response time of the liquid crystal compositions in a liquid crystal display device.Type: GrantFiled: May 22, 1987Date of Patent: November 7, 1989Assignee: Seiko Epson Kabushiki KaishaInventors: Yoshio Shionozaki, Hiroshi Mukai, Tsuyoshi Obikawa, Shuhei Yamada
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Patent number: 4723018Abstract: 2-phenylpyridine derivatives having the general formula: ##STR1## wherein Y is ##STR2## and Z is a straight chain alkyl group having from 1 to 16 carbon atoms, ##STR3## R' is a straight chain alkyl group having from 2 to 12 carbon atoms, R.sup.2 is a straight chain alkyl group having from 1 to 12 carbon atoms, n is an integer from 1 to 10 and * is an asymmetric carbon are provided. The derivatives are stable, have low viscosity, excellent electro-optical response properties and broaden the ferroelectric temperature range when added to ferroelectric liquid crystal compositions.Type: GrantFiled: January 21, 1987Date of Patent: February 2, 1988Assignee: Seiko Epson CorporationInventors: Yoshio Shionozaki, Hiroshi Mukai, Tsuyoshi Obikawa, Shuhei Yamada, Rei Miyazaki
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Patent number: 4684220Abstract: 2-phenylpyridine derivatives represented by the general formula: ##STR1## wherein when Y is R--, Z is one of R--, RO--, ##STR2## when Y is RO--, Z is one of straight chain pentyl, ##STR3## and --CN; and when Y is one of ##STR4## Z is one of R--, RO-- and --CN; when Y is --CN, Z is one of RO--, ##STR5## and R is a straight chain alkyl group from 1 to 12 carbon atoms, are disclosed. The 2-phenylpyridine derivatives in accordance with the invention are particularly well-suited for use in nematic liquid crystal compositions for reducing the steepness and response time of the liquid crystal compositions in a liquid crystal display device.Type: GrantFiled: July 11, 1985Date of Patent: August 4, 1987Assignee: Seiko Epson Kabushiki KaishaInventors: Yoshio Shionozaki, Hiroshi Mukai, Tsuyoshi Obikawa, Shuhei Yamada