Patents by Inventor Shin Imamura
Shin Imamura 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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Publication number: 20110063819Abstract: There are provided a backlight capable of improving luminance efficiency (brightness efficiency) by devising a structure of a HCFL to allow adjustment of a cold spot temperature, and further provided a liquid crystal display device using the backlight. A distance (cathode length) between one tube end portion and one filament of a pair of filaments is set longer than a distance (cathode length) between the other tube end portion and the other filament. In this manner, at least the tube end portion on the longer cathode length side can be set as the cold spot. Further, a tube end portion of a hot cathode fluorescent tube is arranged outside a lamp house. In this manner, the cold spot set at the tube end portion of the hot cathode fluorescent tube can be arranged outside the lamp house where the temperature is low, and the cold spot temperature can be decreased.Type: ApplicationFiled: May 27, 2010Publication date: March 17, 2011Inventors: Kenichi YAMAMOTO, Yoshiro Mikami, Shin Imamura, Makoto Katagishi
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Publication number: 20100096975Abstract: In order to reduce the discharge delay time and increase the image quality in a display device such as a PDP using ultraviolet light emission produced by discharge, there is provided a display device including: a front panel and a rear panel disposed opposite to each other with discharge spaces formed therebetween, and a discharge gas being injected into the discharge spaces; at least a pair of electrodes for performing a display discharge; and phosphor layers emitting visible light by using ultraviolet light emission produced by discharge of the discharge gas. At least one of the compounds represented by the composition formulas Cs(1?x)M1xAl02 (where M1 is the I group element, 0?5x<1) and Cs(1?x)M2xAl(1+x)O(2+2x) (where M2 is the II group element, 0?x<1) is present in any of the components constituting the discharge spaces of the display device.Type: ApplicationFiled: October 14, 2009Publication date: April 22, 2010Applicant: HITACHI CONSUMER ELECTRONICS CO., LTD.Inventors: Shin IMAMURA, Tatsuya MIYAKE, Shunsuke MORI, Kazutaka TSUJI, Keizo SUZUKI, Toshiaki KUSUNOKI, Mitsuharu IKEDA, Shirun HO
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Patent number: 7656081Abstract: To provide an imaging device that shows high resolution and high luminance and produces good-quality images, an imaging device includes phosphor layer having a thickness of 40 ?m or less and containing a phosphor having a composition represented by chemical formula: Y2?x?yTbxScySiO5, wherein “x” and “y” are atomic ratios and satisfy the following conditions: 0<x?1 and 0<y?1. The phosphor preferably has a strongest diffraction peak at diffraction angle 2? of 30.65° to 30.9° in X-ray diffraction for better properties. The phosphor can be prepared by firing a mixture of a compound containing Y, Sc, and Tb with a compound containing Si.Type: GrantFiled: May 30, 2006Date of Patent: February 2, 2010Assignee: Hitachi Displays, Ltd.Inventors: Shin Imamura, Masaaki Komatsu, Hidetsugu Matsukiyo, Masatoshi Shiiki
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Publication number: 20090230836Abstract: Provided is a display device such as a plasma display device including a front plate and a rear plate arranged opposing to each other to form a discharge space, where a discharge gas filled inside the discharge space, and at least a pair of electrodes for performing a display discharge and a phosphor layer for emitting visible light by an ultraviolet ray emission by the discharge of the discharge gas are provided. Inside the discharge space, a material whose main composition is alumina oxychloride of a group IIa metal and/or a group IIb metal is at least partly contained. Accordingly, a sustain discharge voltage can be reduced.Type: ApplicationFiled: February 24, 2009Publication date: September 17, 2009Inventors: Shin Imamura, Shunsuke Mori, Tatsuya Miyake, Hideto Momose, Kazutaka Tsuji, Ryo Inoue, Shirun Ho, Keizo Suzuki
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Publication number: 20090224668Abstract: There is provided a plasma display panel device using phosphors to improve reliability and color reproductivity or color performance. A plasma display panel includes: a discharge gas for generating ultraviolet light as a result of electric discharge, and a phosphor layer containing a phosphor for emitting light as a result of excitation by the ultraviolet light, in which the phosphor contains an Eu activated silicate phosphor added with at least one element selected from Al, Ga, Y and Gd, represented by the following General Formula (1): M13-yM2Si2O8:Euy (1) wherein M1 is at least one element selected from the group consisting of Ba, Ca, and Sr; M2 is at least one element selected from the group consisting of Mg and Zn; and y satisfies the condition of 0.001?y?0.2.Type: ApplicationFiled: October 8, 2008Publication date: September 10, 2009Inventors: Hirotaka Sakuma, Hitoshi Oaku, Choichiro Okazaki, Shin Imamura, Masaaki Komatsu
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Publication number: 20090115332Abstract: A problem of the present invention is to reduce discharge delay and discharge voltage in an image display device such as a PDP using ultraviolet rays emission generated by the discharge, thereby improving image quality and reducing cost. In order to solve the above problem, according to the present invention, the image display device using the ultraviolet rays emission generated by discharge includes, within a discharge space, a phosphor where a 1/10 afterglow time is 1 ms or more and a light emitting wavelength is in a range of 200 to 460 nm in which light emitting intensity is at the maximum. Under the same condition, the effect of the invention can be improved by making the 1/10 afterglow time 8 ms or more. Further, the effect of the present invention is further effective by making the 1/10 afterglow time 100 ms or more.Type: ApplicationFiled: October 30, 2008Publication date: May 7, 2009Inventors: Shin Imamura, Hitoshi Oaku, Tatsuya Miyake, Masaaki Komatsu, Shunsuke Mori, Masatoshi Shiiki
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Publication number: 20080218664Abstract: In conventional fluorescent lamps and imaging devices using the same, there have been challenges that lighting efficiency should be enhanced and variation in emission colors should be reduced. The present invention has solved these challenges by providing a novel fluorescent lamp. The phosphor layers of the fluorescent lamp is composed of at least two types of phosphors, in which at least the most outer surface is a phosphor layer made of one of the phosphors (the first phosphor); and the rest portion of the phosphor layers, is made of mixed phosphors including a plurality of phosphors having respective emitting colors.Type: ApplicationFiled: February 20, 2008Publication date: September 11, 2008Inventors: Shin IMAMURA, Kenji Okishiro, Masaki Nishikawa
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Publication number: 20080160218Abstract: Existent imaging device involves a problem of low resolution and incapable of satisfying all of long lifetime, high luminance, and favorable color reproduction. The foregoing object can be attained according to the invention in an imaging device having excitation unit of irradiating an excitation energy to a phosphor layer to emit a light, in which at least a portion of a phosphor forming a phosphor layer contains a phosphor having a composition represented by the general formula (La1-x-y-zLnxScyMz)2SiO5 where Ln represents at least one element of Tb and Ce, M represents at least one element of Lu, Y and Gd, and x, y, and z satisfy: 0<x<1, 0<y<1, and 0<z<1.Type: ApplicationFiled: August 9, 2007Publication date: July 3, 2008Inventors: Shin Imamura, Masaaki Komatsu, Hirotaka Sakuam
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Publication number: 20080067917Abstract: In order to improve luminescence life, color temperature, the linearity of luminous intensity, and colority that have not been solved by conventional methods, a thin panel display of electron beam excitation type includes a substrate including plural first electrodes parallel to each other, plural second electrodes parallel to each other that are orthogonal to the first electrodes, and electron emitters disposed in intersections of the first electrodes and the second electrodes, or near the intersections, and a faceplate on which phosphor layers are formed, in which, as the phosphor layers, blue emitting phosphor layers are used which contain CaMgSi2O6:Eu blue emitting phosphors that have 0.16° or less as full width at half maximum of an X-ray diffraction peak developing near a central peak of 29.8°.Type: ApplicationFiled: July 11, 2007Publication date: March 20, 2008Inventors: Masaaki Komatsu, Hirotaka Sakuma, Shin Imamura
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Publication number: 20070210693Abstract: To improve luminescence life, linearity of emission luminescence, and colority of an electron beam excitation display of thin flat type. The electron beam excitation display of thin flat type has a rear plate provided with a plurality of first electrodes in parallel with one another, a plurality of second electrodes in parallel with one another and orthogonal to the first electrodes, and electron emitters placed at points of intersection or near the points of intersection of the first electrodes and the second electrodes and a faceplate formed with a phosphor layer. By using a blue-emitting phosphor formed by mixing a blue-emitting phosphor ZnS:Ag and a blue-emitting phosphor CaMgSi2O6:Eu for the phosphor layer, the electron beam excitation display of thin flat type improved in luminescence life, linearity of emission luminescence, and colority that have been left unsolved is provided.Type: ApplicationFiled: February 9, 2007Publication date: September 13, 2007Inventors: Masaaki KOMATSU, Shin Imamura, Hirotaka Sakuma
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Publication number: 20060267474Abstract: To provide an imaging device that shows high resolution and high luminance and produces good-quality images, an imaging device includes phosphor layer having a thickness of 40 ?m or less and containing a phosphor having a composition represented by chemical formula: Y2?x?yTbxScySiO5, wherein “x” and “y” are atomic ratios and satisfy the following conditions: 0<x?1 and 0<y?1. The phosphor preferably has a strongest diffraction peak at diffraction angle 2? of 30.65° to 30.9° in X-ray diffraction for better properties. The phosphor can be prepared by firing a mixture of a compound containing Y, Sc, and Tb with a compound containing Si.Type: ApplicationFiled: May 30, 2006Publication date: November 30, 2006Inventors: Shin Imamura, Masaaki Komatsu, Hidetsugu Matsukiyo, Masatoshi Shiiki
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Patent number: 7005197Abstract: The luminance of phosphor is enhanced by forming a phosphor screen of a fluorescence generation unit by phosphor expressed by the following composition formula: (L1-a-bGdaCeb)3(Al1-cGac)5O12:Md wherein, a, b and c are each in the following ranges of 0?a?1.0, 0<b?0.1 and 0?c?1.0, M is dopant of a monovalent metal element and is included in phosphor by approximately 0<d?1000 wt-ppm. Dopant M of a monovalent metal element is at least one type of element selected from a group consisting of K, Na, Li, Cu, Ag and Au. Thus, a display using a white light of improved luminescence and having excellent characteristics can be realized.Type: GrantFiled: February 14, 2002Date of Patent: February 28, 2006Assignee: Hitachi, Ltd.Inventors: Masatoshi Shiiki, Choichiro Okazaki, Teruki Suzuki, Shin Imamura, Masaaki Komatsu, Hiromichi Yamada
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Publication number: 20060033860Abstract: An object of the present invention is to provide a moving picture displayable liquid crystal display device capable of attaining satisfactory moving picture characteristics, color reproducibility and reliability at the same time.Type: ApplicationFiled: June 17, 2005Publication date: February 16, 2006Inventors: Kenji Okishiro, Shin Imamura, Masatoshi Shiiki
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Patent number: 6808829Abstract: An image-display device using phosphor can improve the its luminescence efficiency and characteristics of color coordinates by adding an IIA element to a host crystal of ZnS phosphor to form a composite crystal. The image-display device improves the luminescence efficiency and color coordinate characteristics by using a phosphor expressed by Zn(1−x)MIIAxS:MIB, MIII where MIIA is one or more IIA elements in periodic table of elements, MIB is one or more IB elements and MIII is one or more MIIIA elements such as Sc or Y.Type: GrantFiled: November 22, 2002Date of Patent: October 26, 2004Assignee: Hitachi, Ltd.Inventors: Masaaki Komatsu, Masatoshi Shiiiki, Shin Imamura
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Patent number: 6791253Abstract: A field-emission display apparatus includes a faceplate on which a phosphor layer is formed, and a means for irradiating electron beam onto the phosphor layer and the phosphor layer is constituted by phosphors formed by mixing main phosphors with small particle phosphors, the averaged particle diameter of which is smaller than ½ of an averaged particle diameter of the main phosphors, enhancing the filing density of the phosphor layer and also enhancing both a lifetime characteristic and a luminescent characteristic of the phosphor layer.Type: GrantFiled: June 20, 2002Date of Patent: September 14, 2004Assignee: Hitachi, Ltd.Inventors: Masaaki Komatsu, Masatoshi Shiiki, Shin Imamura
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Patent number: 6762551Abstract: A white light source includes an ultraviolet-visible excitation light generation unit capable of generating visible light and ultraviolet light, and a fluorescence generation unit having a phosphor layer and being capable of generating visible light upon excitation by the ultraviolet light and uses, in the phosphor layer, a red light emitting phosphor represented by the following compositional formula: (Ca1−a−bSraEub)S:Mc, wherein a, b and c satisfy the following conditions: 0≦a<1.0, 0≦b<0.1 and 0≦c≦0.1; and M is a dopant element having absorption of excitation energy at about 350 nm to about 500 nm. The dopant element M includes rare earth elements such as Ce, Yb, Gd and Tm. By substituting part of Ca and/or Sr with Zn, the white light source can exhibit further improved performances.Type: GrantFiled: March 14, 2002Date of Patent: July 13, 2004Assignee: Hitachi, Ltd.Inventors: Masatoshi Shiiki, Masaaki Komatsu, Choichiro Okazaki, Shin Imamura, Teruki Suzuki
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Patent number: 6753099Abstract: The present invention provides a green emitting phosphor which includes an excess of the ordinary SiO2 component included in parent material Y2−2xSiO5 activated by Tb in terms of stoichiometric ratio. The composition of the above phosphor is represented by chemical formula: {(Y1−y−zMyGdz)1−xTbx}2(Si1−bGebO2)1+aO3 where values of x, y, z, a, and b are assigned, subject to 0<x≦1, 0≦y≦1, 0≦z≦1, 0<a≦1, and 0≦b≦1, and M is at least one element selected from a group comprising Sc, In, La, Lu, Yb, Ce, Eu, Sm, Tm, Ho, Er, and Nd. By using this phosphor, phosphors that emit light of higher luminance with less luminance degradation and are suitable for high-quality image display and imaging devices producing high-quality images are obtained.Type: GrantFiled: June 27, 2002Date of Patent: June 22, 2004Assignees: Hitachi, Ltd., Hitachi Device Engineering Co., Ltd., Kasei Optonix, Ltd.Inventors: Shin Imamura, Masatoshi Shiiki, Masaaki Komatsu, Hidetsugu Matsukiyo, Yoshihiro Koseki, Takashi Hase, Tsutomu Yamada
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Patent number: 6696782Abstract: Green-emitting phosphor having a composition formula represented by (Y1-x-aGdxMa)3-3yTb3y(Al1-zGaz)5O12, where 0<x≦1, 0≦a<1, 0<x+a≦1, 0<y<1 and 0≦z≦1 and M is at least one of Sc, Yb and La, improves emission color of phosphors of Y3(Al, Ga)5O12:Tb series, and in case that y=0.07, z=0.4 and a=0 in the foregoing composition, color y is increased with increasing Gd concentration, when Gd concentration x is changed, and the emission color becomes clear green.Type: GrantFiled: March 20, 2001Date of Patent: February 24, 2004Assignee: Hitachi, Ltd.Inventors: Shin Imamura, Masatoshi Shiiki, Hiromichi Yamada, Masaaki Komatsu
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Publication number: 20030164670Abstract: The present invention provides an image-display device using a phosphor which can improve a luminescence efficiency and characteristics of color coordinates by adding a IIA element to a host crystal of a ZnS phosphor to make a compound crystal.Type: ApplicationFiled: November 22, 2002Publication date: September 4, 2003Inventors: Masaaki Komatsu, Masatoshi Shiiiki, Shin Imamura
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Publication number: 20030155856Abstract: A white light source includes an ultraviolet-visible excitation light generation unit capable of generating visible light and ultraviolet light, and a fluorescence generation unit having a phosphor layer and being capable of generating visible light upon excitation by the ultraviolet light and uses, in the phosphor layer, a red light emitting phosphor represented by the following compositional formula: (Ca1−a−bSraEub)S:Mc, wherein a, b and c satisfy the following conditions: 0≦a<1.0, 0≦b<0.1 and 0≦c≦0.1; and M is a dopant element having absorption of excitation energy at about 350 nm to about 500 nm. The dopant element M includes rare earth elements such as Ce, Yb, Gd and Tm. By substituting part of Ca and/or Sr with Zn, the white light source can exhibit further improved performances.Type: ApplicationFiled: March 14, 2002Publication date: August 21, 2003Applicant: Hitachi, Ltd.Inventors: Masatoshi Shiiki, Masaaki Komatsu, Choichiro Okazaki, Shin Imamura, Teruki Suzuki