Patents by Inventor Akira Ebisawa
Akira Ebisawa 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: 9028976Abstract: A highly stable organic EL material having the properties of both benzofluoranthene and anthracene structures is provided. The organic EL device has at least one organic compound layer containing a compound presented by the general formula (I) below: (in which L is a linking group linking any one of the positions 1 to 12 and any one of the positions 13 to 22; the unlinked positions 1 to 22 are substituted by any of a hydrogen atom, substituted or unsubstituted aryl group, substituted or unsubstituted heterocyclic group, substituted or unsubstituted alkyl group, and aromatic amino group; and L presents any of a single bond, substituted or unsubstituted arylene group, substituted or unsubstituted heterocyclic group, and substituted or unsubstituted alkylene group).Type: GrantFiled: May 27, 2011Date of Patent: May 12, 2015Assignee: Futaba CorporationInventors: Akira Ebisawa, Hajime Amano, Sumiko Kitagawa, Tetsushi Inoue
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Publication number: 20110295017Abstract: A highly stable organic EL material having the properties of both benzofluoranthene and anthracene structures is provided. The organic EL device has at least one organic compound layer containing a compound presented by the general formula (I) below: (in which L is a linking group linking any one of the positions 1 to 12 and any one of the positions 13 to 22; the unlinked positions 1 to 22 are substituted by any of a hydrogen atom, substituted or unsubstituted aryl group, substituted or unsubstituted heterocyclic group, substituted or unsubstituted alkyl group, and aromatic amino group; and L presents any of a single bond, substituted or unsubstituted arylene group, substituted or unsubstituted heterocyclic group, and substituted or unsubstituted alkylene group).Type: ApplicationFiled: May 27, 2011Publication date: December 1, 2011Applicant: TDK CorporationInventors: Akira EBISAWA, Hajime Amano, Sumiko Kitagawa, Tetsushi Inoue
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Patent number: 7897269Abstract: Organic EL elements provided with a substrate 10, a first electrode layer 12 and a second electrode layer 18 situated in a mutually opposing manner on one side of the substrate 10, and a luminescent layer 20 situated between the electrode layers, wherein one of the first electrode layer 12 and the second electrode layer 18 is a hole injection electrode layer and the other is an electron injection electrode layer, and there is formed in the luminescent layer 20 a modified section 16 which contains an organic polymer compound different from the organic compound composing the luminescent layer 14, in bias toward the electron injection electrode layer.Type: GrantFiled: August 20, 2004Date of Patent: March 1, 2011Assignee: TDK CorporationInventors: Emiko Kambe, Akira Ebisawa, Satoshi Shirai, Masahiro Shinkai, Tetsushi Inoue
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Patent number: 7425375Abstract: An organic EL element of the present invention comprises a substrate, an electrode layer, an organic layer, and an electrode layer, whereas the organic layer 3 contains a vinyl polymer obtained by polymerizing a polymerizable monomer containing a compound represented by formula (1) or (2): wherein each of L1 and L2 is a bivalent group; each of X1, X2, X3, X4, X5, and X6 is alkyl group or the like; each of a and e is 0 or 1; each of b, f, g, and h is an integer of 0 to 3; c is an integer of 0 to 2; and d is an integer of 0 to 4.Type: GrantFiled: March 29, 2004Date of Patent: September 16, 2008Assignee: TDK CorporationInventors: Satoshi Shirai, Akira Ebisawa, Masahiro Shinkai, Emiko Kambe
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Publication number: 20060238110Abstract: An organic EL element of the present invention comprises a substrate, an electrode layer, an organic layer, and an electrode layer, whereas the organic layer 3 contains a vinyl polymer obtained by polymerizing a polymerizable monomer containing a compound represented by formula (1) or (2): wherein each of L1 and L2 is a bivalent group; each of X1, X2, X3, X4, X5, and X6 is alkyl group or the like; each of a and e is 0 or 1; each of b, f, g, and h is an integer of 0 to 3; c is an integer of 0 to 2; and d is an integer of 0 to 4.Type: ApplicationFiled: March 29, 2004Publication date: October 26, 2006Applicant: TDK CorporationInventors: Satoshi Shirai, Akira Ebisawa, Masahiro Shinkai, Emiko Kambe
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Patent number: 7049011Abstract: A vinyl polymer having a 9,10-substituted anthracene structure which is a stable structure with a high solid quantum efficiency is obtained from a vinyl monomer having a group derived from the structure of formula (1) wherein n1 is an integer of 1 to 3, each of X1, X2, X3 and X4 is a substituent group, k1 and k4 are integers of 0 to 5, and k2 and k3 are integers of 0 to 4. An organic EL device comprising an organic layer containing the vinyl polymer becomes a molecule dispersed type organic EL device featuring a high efficiency and a long life.Type: GrantFiled: March 14, 2003Date of Patent: May 23, 2006Assignee: TDK CorporationInventors: Akira Ebisawa, Masahiro Shinkai
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Publication number: 20060040137Abstract: A first organic EL device in accordance with the present invention comprises a pair of electrodes opposing each other and a luminescent layer, disposed between the electrodes, containing a polymer having an anthracene structure; and a hole-transferring compound having a glass transition temperature of at least 70° C. A second organic EL device in accordance with the present invention comprises a hole injection electrode and an electron injection electrode which oppose each other; a luminescent layer, disposed between the hole injection electrode and electron injection electrode, containing a polymer having an anthracene structure and having a modified part, disposed near the surface on the side closer to the electron injection electrode, containing a hole-blocking compound having a bandgap of at least 4.0 eV; and an electron-blocking layer, disposed between the hole injection electrode and the luminescent layer, containing a hole-transferring compound having an electron affinity of 3.0 eV or less.Type: ApplicationFiled: August 12, 2005Publication date: February 23, 2006Applicant: TDK CORPORATIONInventors: Emiko Kambe, Akira Ebisawa
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Publication number: 20050129979Abstract: Organic EL elements provided with a substrate 10, a first electrode layer 12 and a second electrode layer 18 situated in a mutually opposing manner on one side of the substrate 10, and a luminescent layer 20 situated between the electrode layers, wherein one of the first electrode layer 12 and the second electrode layer 18 is a hole injection electrode layer and the other is an electron injection electrode layer, and there is formed in the luminescent layer 20 a modified section 16 which contains an organic polymer compound different from the organic compound composing the luminescent layer 14, in bias toward the electron injection electrode layer.Type: ApplicationFiled: August 20, 2004Publication date: June 16, 2005Applicant: TDK CORPORATIONInventors: Emiko Kambe, Akira Ebisawa, Satoshi Shirai, Masahiro Shinkai, Tetsushi Inoue
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Publication number: 20040048100Abstract: A vinyl polymer having a 9,10-substituted anthracene structure which is a stable structure with a high solid quantum efficiency is obtained from a vinyl monomer having a group derived from the structure of formula (1) wherein n1 is an integer of 1 to 3, each of X1, X2, X3 and X4 is a substituent group, k1 and k4 are integers of 0 to 5, and k2 and k3 are integers of 0 to 4. An organic EL device comprising an organic layer containing the vinyl polymer becomes a molecule dispersed type organic EL device featuring a high efficiency and a long life.Type: ApplicationFiled: March 14, 2003Publication date: March 11, 2004Applicant: TDK CORPORATIONInventors: Akira Ebisawa, Masahiro Shinkai
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Patent number: 6284342Abstract: An organic EL structure is received in a gas-tight casing to construct an organic EL display assembly. The organic EL structure includes a hole injecting electrode, an electron injecting electrode, and at least one organic layer disposed between the electrodes. A desiccant selected from calcium hydride, strontium hydride and a mixture thereof is disposed in the casing out of contact with the organic EL structure. This EL display assembly substantially eliminates the influence of moisture and has a long lifetime.Type: GrantFiled: June 11, 1999Date of Patent: September 4, 2001Assignee: TDK CorporationInventors: Akira Ebisawa, Osamu Onitsuka, Hiroyuki Endo, Masayuki Kawashima, Toshio Hayakawa
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Patent number: 6268071Abstract: An organic EL device comprises a substrate, an organic EL structure stacked on the substrate, a sealing plate located on the organic EL structure with a predetermined space therebetween, and a sealing adhesive agent for fixing the sealing plate on the substrate and thereby closing up the organic EL structure. The sealing adhesive agent is a photo-curing type adhesive agent which, upon photo-curing, generates gases under heating conditions of 85° C. and 60 minutes. In these gases, the total amount of a low-molecular straight-chain aliphatic hydrocarbon which may have a substituent, an aromatic hydrocarbon which may have a substituent, an alicyclic hydrocarbon which may have a substituent, and a heterocyclic compound and a siloxane which may have a substituent is 200 &mgr;g/g or lower calculated as benzene.Type: GrantFiled: August 28, 1998Date of Patent: July 31, 2001Assignee: TDK CorporationInventors: Kouji Yasukawa, Hiroyuki Endo, Hideo Kato, Junichi Shimamura, Osamu Onitsuka, Akira Ebisawa
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Patent number: 6259204Abstract: An organic EL structure is formed on a substrate 1, and a sealing sheet is located at a position above the substrate, where the sealing sheet comes in no contact with the organic EL structure. A height from the surface of the substrate, on which an organic EL device structure in a film form is provided, to a junction of the sealing sheet with the substrate has a value larger than the value obtained by adding the size of an irregularity or undulation of the sealing sheet to the height of the organic EL structure.Type: GrantFiled: October 15, 1998Date of Patent: July 10, 2001Assignee: TDK CorporationInventors: Akira Ebisawa, Kouji Yasukawa, Hiroyuki Endo, Taku Someya, Osamu Onitsuka
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Patent number: 6049167Abstract: In an organic EL display device, an organic EL multilayer structure is disposed in a gastight space defined between a substrate and a shield member and filled with an inert gas. The organic EL multilayer structure includes organic materials having a Tg of at most 140.degree. C. The shield member is a continuous member free of a filling port. The shield member is joined to the substrate with a UV-curing epoxy resin adhesive of the cationic curing type. The inert gas in the space has a water content of at most 100 ppm. The steps of forming layers on substrates to form organic EL multilayer structures and the steps of adhesively joining shield members to the substrates are carried out in inert gas atmospheres.Type: GrantFiled: February 13, 1998Date of Patent: April 11, 2000Assignee: TDK CorporationInventors: Osamu Onitsuka, Akira Ebisawa, Mitsunari Suzuki, Hiroshi Yamamoto, Michio Arai
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Patent number: 6023371Abstract: A color conversion material comprises a high-molecular material having a light transmittance of at least 90% in a visible light region, a fluorescent dye contained therein, and a fluorescent pigment particle dispersed therein. The wavelength of unconverted light incident on the color conversion material is up to 520 nm, the light emission maximum wavelength of the conversion material is at least 580 nm upon incident light conversion, and the conversion efficiency of at least 10% is obtained.Type: GrantFiled: June 8, 1998Date of Patent: February 8, 2000Assignee: TDK CorporationInventors: Osamu Onitsuka, Tetsushi Inoue, Akira Ebisawa, Mutsuko Nakano