Patents by Inventor Takeo Itou
Takeo Itou 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: 5444329Abstract: The present invention is directed to an antireflection film having a multilayer structure in which an antireflection multilayer film including at least two thin films is formed on a substrate, wherein at least one of the thin films contains a coloring agent. The antireflection multi-layer film absorbs light of an entire range of wavelength of 400-700 nm, and the reflectance of the antireflection multi-layer film with regard to the wavelength, light of which this antireflection multi-layer film can absorb, is smaller than the reflectance of the substrate. The antireflection film can be applied to a cathode ray tube or a light-transmitting display substrate of a display apparatus such as a liquid crystal display apparatus for the purpose of effectively avoiding reflection of external light.Type: GrantFiled: November 5, 1993Date of Patent: August 22, 1995Assignee: Kabushiki Kaisha ToshibaInventors: Hidemi Matsuda, Takeo Itou, Hisashi Chigusa, Michiyo Abe
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Patent number: 5281893Abstract: A display device including a display screen having an optical film provided thereon. The optical film is a porous thin film made of fine magnesium fluoride particles and a binder containing a condensate of a silane compound having a fluoroalkyl group, a co-condensate of the silane compound and silicon, or a co-condensate of the silane compound and a metal oxide compound. The combination of the specific binder and fine magnesium fluoride particles permits forming a porous optical film having a surprisingly high mechanical strength, excellent resistance to humidity and reduced external light reflection from the display plane.Type: GrantFiled: July 22, 1991Date of Patent: January 25, 1994Assignee: Kabushiki Kaisha ToshibaInventors: Hidemi Matsuda, Takeo Itou, Kazuhiko Shimizu
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Patent number: 5218268Abstract: A cathode ray tube has a vacuum envelope which includes a faceplate, an optical filter formed on the faceplate, the optical filter including mainly of SiO.sub.2 and containing a coloring material, and a phosphor layer formed on the inner surface of the faceplate. The optical filter includes silicon having a fluorine-containing group and a siloxane bond at least on the surface thereof, and a maximum light absorption wavelength in a range of 400 to 650 nm is in a region of 575.+-.20 nm, and where the transmissivity for the wavelength of 450 nm is T.sub.450, that for 530 nm is T.sub.530, that for 550 nm is T.sub.550, that for 630 nm is T.sub.630, and that for the maximum absorption wavelength is Tmin, the following relationship is established:Tmin.ltoreq.T.sub.550 .ltoreq.T.sub.530,1.ltoreq.T.sub.450 /T.sub.539 .ltoreq.2,1.ltoreq.T.sub.630 /T.sub.530 .ltoreq.2,0.7.ltoreq.T.sub.450 /T.sub.630 .ltoreq.1.43.Type: GrantFiled: April 15, 1992Date of Patent: June 8, 1993Assignee: Kabushiki Kaisha ToshibaInventors: Hidemi Matsuda, Takeo Itou, Kazuhiko Shimizu
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Patent number: 5153481Abstract: A display device comprising a display screen, and an optical film formed on the display screen and having a porous lower layer mainly consisting of TiO.sub.2 and having a porosity of 30% to 75% and an average pore size of 10 nm or less and an upper layer stacked on the lower layer and essentially consisting of a silicon compound having a fluorine-containing group and a siloxane bond. In this display device, the optical film can be easily formed and has a satisfactory anti-reflection effect and satisfactory strength.Type: GrantFiled: March 5, 1991Date of Patent: October 6, 1992Assignee: Kabushiki Kaisha ToshibaInventors: Hidemi Matsuda, Takeo Itou, Kazuhiko Shimizu
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Patent number: 5148082Abstract: A color picture tube comprising an envelope including a front panel, a phosphor screen formed in the inner surface of the front panel, and an electron gun arranged in the envelope. The phosphor screen includes a light absorbing layer having a plurality of holes and phosphor layers formed in the holes so as to partially overlap the light absorbing layer. The transmittance T of the light absorbing layer, the ratio a of the area of a light emitting region in a portion where the light absorbing layer overlaps the phosphor layers to the area of the phosphor screen, the ratio b of the area of the light absorbing layer to the area of the phosphor screen, and the ratio r of the light emitting region in the holes to the area of the holes satisfy the following relational expression: 1/T.gtoreq.1/2{(rb/a)-[a/(1-b)r]}.Type: GrantFiled: February 13, 1992Date of Patent: September 15, 1992Assignee: Kabushiki Kaisha ToshibaInventors: Takeo Itou, Hidemi Matsuda, Hajime Tanaka, Kazuhiko Shimizu
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Patent number: 5126627Abstract: A color cathode ray tube includes an envelope having, a faceplate, light filtering device provided on an outer surface of the faceplate, and a phosphor screen formed on an inner surface of the faceplate. The phosphor screen is composed of red, blue, and green emitting phosphors. The red emitting phosphor is primarily a Y.sub.2 O.sub.3 :Eu phosphor with an Eu activation amount between 3.0 mol % and 9.0 mol % inclusive with respect to a Y.sub.2 O.sub.3 amount as a base material. The light filtering device is provided in front of the faceplate for selectively transmitting light having a maximum absorption wavelength of 575.+-.20 nm in a wavelength range from 400 nm to 650 nm, and satisfies the following relationship: T.sub.min .ltoreq.T.sub.550 .ltoreq.T.sub.530, 1.ltoreq.T.sub.450 /T.sub.530 .ltoreq.2, 1.ltoreq.T.sub.615 /T.sub.530 .ltoreq.2, 0.7.ltoreq.T.sub.450 /T.sub.615 .ltoreq.1.43, T.sub.615 /T.sub.580-600 .gtoreq.1.1, wherein T.sub.450, T.sub.530, T.sub.505, T.sub.615, T.sub.min and T.sub.Type: GrantFiled: December 12, 1990Date of Patent: June 30, 1992Assignee: Kabushiki Kaisha ToshibaInventors: Takeo Itou, Hidemi Matsuda, Hajime Tanaka
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Patent number: 5045750Abstract: A color picture tube includes a vacuum envelope having a faceplate, a phosphor screen formed to include semitransparent black light-absorption layers coated on a first region of the faceplate in stripes or in a matrix, and phosphor layers of blue, red and green emitting phosphors coated on a second region of the faceplate in stripes or in dots, and an electron gun, arranged within the vacuum envelope, for emitting and focusing electron beams. End portions of the phosphor layers extend over the black light-absorption layers, thereby forming overlapped portions. Gaps are provided between the phosphor layers and over the black light-absorption layers, thereby forming light-absorption sections on which no phosphor layer is provided.Type: GrantFiled: July 25, 1990Date of Patent: September 3, 1991Assignee: Kabushiki Kaisha ToshibaInventors: Takeo Itou, Hidemi Matsuda, Kazuhiko Shimizu, Hajime Tanaka
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Patent number: 4987338Abstract: a cathode ray tube comprises an envelope including a faceplate with an inner and outer surface and an antistatic layer covering the outer surface of the faceplate for discharging static charges accumulating in the faceplate. The antistatic layer is formed by using a solution containing an alcoholate of silicon as main constituent. The antistatic layer contains a stabilizing substance for maintaining antistatic characteristics. The antistatic layer also has light filtering characteristics when the layer contains xanthene dye as filtering substance.Type: GrantFiled: March 23, 1989Date of Patent: January 22, 1991Assignee: Kabushiki Kaisha ToshibaInventors: Takeo Itou, Hidemi Matsuda, Hajime Tanaka
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Patent number: 4977347Abstract: A color filter comprising a vitreous material including at least one kind of organic compound having visible light absorbing properties, and at least one metallic compound selected from the group consisting of a Ni compound and a Co compound. A given dye can be used in the color filter of this invention as the organic compound. Thus, the hue of the color filter is freely selectable. In addition, high light resistance can be attained by sealing the organic compound in the vitreous material in the presence of the metal compound.Type: GrantFiled: August 4, 1989Date of Patent: December 11, 1990Assignee: Kabushiki Kaisha ToshibaInventors: Takeo Itou, Hidemi Matsuda
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Patent number: 4937493Abstract: A cathode ray tube has an envelope including a faceplate with a sidewall portion and a neck receiving an electron gun emitting at least one electron beam. The faceplate is coated with a phosphor layer for emitting a visible light by bombardment of the electron beam on its inner surface and is covered with an antistatic film. To prevent accumulation of electrostatic charges, the antistatic film is electrically connected to a metal tension band wound around the sidewall portion by a connecting element. The connecting element is conductive oxide layer which essentially consists of a conductive substance and a binder consisting at least amorphous silicon oxide or silicon hydroxide.Type: GrantFiled: December 27, 1988Date of Patent: June 26, 1990Assignee: Kabushiki Kaisha ToshibaInventors: Norio Koike, Takeo Itou, Hidemi Matsuda, Masakazu Takaki
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Patent number: 4908232Abstract: A method of and apparatus for forming a thin film having a smooth surface and a uniform film thickness such as an antistatic or antireflection film on the outer surface of a display screen of a cathode ray tube, includes the steps of applying a film formation material solution containing a volatile solvent on the outer surface of the display screen of the cathode ray tube to form a solution film, rotating the cathode ray tube about a tube axis thereof to obtain an uniform film thickness of the solution film, and causing a portion of the solution film applied in and near the center of the outer surface of the display screen to dry while the cathode ray tube is being rotated.Type: GrantFiled: April 8, 1988Date of Patent: March 13, 1990Assignee: Kabushiki Kaisha ToshibaInventors: Takeo Itou, Hidemi Matsuda, Sakae Kamitani, Norihisa Takiura
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Patent number: 4900984Abstract: A cathode ray tube according to the present invention has a sufficient antistatic property which can be obtained by forming a glass film containing SiO.sub.2 or P.sub.2 O.sub.5 as a main component and a hygroscopic metal salt on the outer surface of its front panel.Type: GrantFiled: April 27, 1988Date of Patent: February 13, 1990Assignees: Kabushiki Kaisha Toshiba, Tama Chemicals Co., Ltd.Inventors: Takeo Itou, Hidemi Matsuda, Mamory Yoshizako, Osamu Yagi
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Patent number: 4873120Abstract: According to the invention, an antistatic/anti-reflecting film of high adhesive strength can be formed easily by forming an SiO.sub.2 film on a cathode-ray tube faceplate by means of a condensation reaction of polyalkyl siloxane consisting essentially of condensed alkyl silicates. As a result, the sintering conditions for forming an antistatic/anti-reflecting film can be set adequately. The antistatic effect can be further enhanced, reflection of the external light can be decreased, and workability can be greatly improved.Type: GrantFiled: December 23, 1987Date of Patent: October 10, 1989Assignees: Kabushiki Kaisha Toshiba, Tama Chemicals Co., Ltd.Inventors: Takeo Itou, Hidemi Matsuda, Mamoru Yoshizako, Osamu Yagi
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Patent number: 4831307Abstract: In a cathode ray tube, a single layer for prevention of a reflection of light rays is formed on a face plate having a non-spherical outer surface. The thickness of the layer is continuously decreased from the center region toward the peripheral regions of the face plate.Type: GrantFiled: December 23, 1987Date of Patent: May 16, 1989Assignee: Kabushiki Kaisha ToshibaInventors: Shigeo Takenaka, Takeo Itou, Hidemi Matsuda
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Patent number: 4785217Abstract: This invention provides a cathode-ray tube having an antistatic film formed mainly by metal oxide and containing particles of at least one metal selected from the group consisting of Pd, Sn, Pt, Ag and Au, the particles having an average particle size of 0.01 micron at most. The film can be easily formed from a solution, thus, reducing the cost.Type: GrantFiled: December 23, 1987Date of Patent: November 15, 1988Assignee: Kabushiki Kaisha ToshibaInventors: Hidemi Matsuda, Takeo Itou
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Patent number: 4772818Abstract: In a cathode ray tube with a phosphor screen containing a Zn type green emitting phosphor, e.g. ZnS, ZnCdS and Zn.sub.2 SiO.sub.4, the surface of the phosphor particle includes a surface area of (Co,Zn)O. The surface area is green colored to operate as a filter against incident light from outside the tube and reduces background brightness of picture images caused by excitation of scattering electrons. Thus, the contrast of the picture images rises. The contrast is further increased by Ni doped.Type: GrantFiled: October 21, 1986Date of Patent: September 20, 1988Assignee: Kabushiki Kaisha ToshibaInventors: Norio Koike, Takeo Itou, Hidemi Matsuda, Mitsuhiro Oikawa
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Patent number: 4772345Abstract: A method of manufacturing a phosphor screen of uniform thickness on an inner surface of a panel of a cathode ray tube, comprising the steps of forming a powder-receptive adhesive pattern on the inner surface of a substantially rectangular panel having a skirt portion at the periphery, forming a sealed vessel consisting essentially of a container for containing phosphor powder and the panel by combining integrally the container and the panel so that the openings of both are opposed, and rotating the sealed container about an axis parallel to the inner surface of the panel.Type: GrantFiled: March 30, 1987Date of Patent: September 20, 1988Assignee: Kabushiki Kaisha ToshibaInventors: Seiji Sagou, Takeo Itou
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Patent number: 4771214Abstract: Electron tube having an evacuated envelope equipped with an electron emitting cathode, wherein a layer of activated silicon oxide is formed inside the envelope. The activated silicon oxide layer improves the emission life.Type: GrantFiled: March 10, 1986Date of Patent: September 13, 1988Assignee: Kabushiki Kaisha ToshibaInventors: Shigeo Takenaka, Takeo Itou, Norio Koike, Hidemi Matsuda
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Patent number: 4732828Abstract: In a method for a phosphor screen of a cathode ray tube including the steps of forming a photo-tacky layer on a panel of a cathode ray tube, exposing the photo-tacky layer to form an adhesive pattern on the layer, and adhering phosphor powder on the adhesive pattern, in which these exposing and adhering steps are repeated. Before next exposing step, the photo-tacky layer is heated and then exposed after cooled. The heating step prevents the sensitivity of the layer from deterioration occurred by the preceding adhering step.Type: GrantFiled: November 5, 1986Date of Patent: March 22, 1988Assignee: Kabushiki Kaisha ToshibaInventors: Seiji Sagou, Takeo Itou
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Patent number: 4692659Abstract: In a color cathode ray tube provided with in-tube metallic members of which the main constituent is iron, such as the shadow mask assembly or inner shield, at least part of the surface of these metallic members is formed with a blackened region. The vicinity of the surface of this blackened region contains Al, Fe and Si, the Si content being selected in the range 1.5 wt % to 30 wt %, preferably 4 wt % to 15 wt %.Type: GrantFiled: March 24, 1986Date of Patent: September 8, 1987Assignee: Kabushiki Kaisha ToshibaInventors: Shigeo Takenaka, Norio Koike, Takeo Itou, Hidemi Matsuda