Patents by Inventor Hiromi Wakasono
Hiromi Wakasono 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: 6784607Abstract: In a color cathode ray tube in which a shadow mask and an inner magnetic shield are supported by a mask frame and an electron shield is provided in the mask frame, at least a part of the electron shield is made to have a smaller anhysteretic magnetic permeability than the shadow mask, the mask frame and the inner magnetic shield when an applied magnetic field is 800 A/m (10 Oe). Since the magnetic resistance of the electron shield increases, it is possible to reduce a leakage magnetic field from a tube-axis-side edge of the electron shield. Thus, a color cathode ray tube that reduces mis-landing due to a terrestrial magnetism and has no color displacement can be provided.Type: GrantFiled: April 5, 2001Date of Patent: August 31, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Koji Shimada, Hiromi Wakasono
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Patent number: 6774554Abstract: A cathode ray tube includes a bulb including a front panel and a funnel, and an electron gun. The front panel includes a color selection mechanism and phosphors on an inner surface thereof. The funnel includes a conductive layer on an inner wall thereof. The electron gun is accommodated in a neck portion of the funnel. The conductive layer is divided into at least two regions, each of which has a different electric potential. A high electric potential conductive layer having a high electric potential, an insulating region, a resistive layer, and a low electric potential conductive layer having an electric potential lower than that of the high electric potential conductive layer are formed in this order from the panel side to the electron gun side. With this configuration, the two conductive layers do not interfere with each other because of discharge or the like and are independent, and stable voltage can be maintained. Thus, an electrostatic lens can be formed.Type: GrantFiled: August 24, 2000Date of Patent: August 10, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toshikuni Kojima, Masanori Morii, Hiromi Wakasono
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Patent number: 6727640Abstract: In a disclosed glass bulb for a cathode-ray tube (CRT), a funnel unit have a less depth than a conventional one. The glass bulb for the CRT includes a panel unit having a panel screen, a neck unit holding an electron gun, and a funnel unit having a funnel-like shape, and the panel unit and the neck unit are bridged by the funnel unit. In the glass bulb, the funnel unit is formed from a plurality of glass members and a maximum-to-minimum thickness ratio of each of the plurality of glass members is designed to be within a range suitable for producing the glass members using pressing.Type: GrantFiled: May 7, 2001Date of Patent: April 27, 2004Assignees: Matsushita Electric Industrial Co., Ltd., Nippon Electric Glass Co., Ltd.Inventors: Hiroshi Sakurai, Hiromi Wakasono, Masaya Kyono, Koji Kuwahara
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Patent number: 6534935Abstract: In a color CRT apparatus in which three electron beams are not superimposed on one point on the screen at a time, a time difference is applied to modulating signals corresponding to the respective electron beams to adjust phase, thus achieving convergence of images, the screen is flat, both a horizontal magnetic deflection field and a vertical magnetic deflection field have uniform magnetic field distribution, paths of both side electron beams and a path of the center electron beam of the three electron beams emitted from electron sources are approximately parallel, and the time difference applied to the modulating signals is set to be approximately constant throughout the screen. Thus, images formed of imaging spots of the three electron beams can be superimposed on the screen with high precision to be matched without causing increased cost.Type: GrantFiled: October 12, 2000Date of Patent: March 18, 2003Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroshi Sakurai, Etsuji Tagami, Hiromi Wakasono
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Patent number: 6528935Abstract: A cathode-ray tube in which an outer surface of a face portion is substantially flat, an inner surface of the face portion is a curved surface convex to the outer surface, and when the axis extending approximately in parallel to a long side through the center of the inner surface is X-axis, the axis extending approximately in parallel to a short side through the center of the inner surface is Y-axis, the radius of curvature of the inner surface along the X-axis is Rx, the radius of curvature of the inner surface along the Y-axis is Ry, the radius of curvature of the inner surface along a long side of a phosphor screen is Rt, the length of a long side of the phosphor screen is H, and the length of a short side of the phosphor screen is V, the following inequalities are satisfied: 1.2H1.3923<Rx<3.00H1.4284, (1) 1.2H1.3923<Rt<3.00H1.4284, (2) and 3.0V1.4670<Ry<6.67V1.5453.Type: GrantFiled: October 5, 2000Date of Patent: March 4, 2003Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiromi Wakasono, Yuichi Kimura
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Patent number: 6447963Abstract: A light quantity correction filter that can implement the desired transmittance distribution precisely and easily without complicating an exposure system, a method of making the light quantity correction filter, and a method of manufacturing a color cathode ray tube using the light quantity correction filter are provided.Type: GrantFiled: October 4, 1999Date of Patent: September 10, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventor: Hiromi Wakasono
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Publication number: 20010052750Abstract: Disclosed is a color cathode ray tube, comprising a glass bulb having a phosphor screen formed on the inner surface, a mask frame having a frame-like body arranged within the glass bulb, a shadow mask stretched between the mutually facing two sides of the mask frame, and a reinforcing band mounted to the outer circumferential surface of the glass bulb, wherein the reinforcing band exhibits a permeability &mgr; falling within a range of between 430 and 640 under a magnetic field of 0.3 Oe.Type: ApplicationFiled: June 5, 2001Publication date: December 20, 2001Applicant: NKK CorporationInventors: Yasushi Tanaka, Hideki Matsuoka, Kenji Tahara, Susumu Kitajima, Hiromi Wakasono
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Publication number: 20010046633Abstract: A light quantity correction filter that can implement the desired transmittance distribution precisely and easily without complicating an exposure system, a method of making the light quantity correction filter, and a method of manufacturing a color cathode ray tube using the light quantity correction filter are provided.Type: ApplicationFiled: October 4, 1999Publication date: November 29, 2001Inventor: HIROMI WAKASONO
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Publication number: 20010043041Abstract: In a disclosed glass bulb for a cathode-ray tube (CRT), a funnel unit have a less depth than a conventional one. The glass bulb for the CRT includes a panel unit having a panel screen, a neck unit holding an electron gun, and a funnel unit having a funnel-like shape, and the panel unit and the neck unit are bridged by the funnel unit. In the glass bulb, the funnel unit is formed from a plurality of glass members and a maximum-to-minimum thickness ratio of each of the plurality of glass members is designed to be within a range suitable for producing the glass members using pressing.Type: ApplicationFiled: May 7, 2001Publication date: November 22, 2001Inventors: Hiroshi Sakurai, Hiromi Wakasono, Masaya Kyono, Koji Kuwahara
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Publication number: 20010033129Abstract: In a color cathode ray tube in which a shadow mask and an inner magnetic shield are supported by a mask frame and an electron shield is provided in the mask frame, at least a part of the electron shield is made to have a smaller anhysteretic magnetic permeability than the shadow mask, the mask frame and the inner magnetic shield when an applied magnetic field is 800 A/m (10 Oe). Since the magnetic resistance of the electron shield increases, it is possible to reduce a leakage magnetic field from a tube-axis-side edge of the electron shield. Thus, a color cathode ray tube that reduces mis-landing due to a terrestrial magnetism and has no color displacement can be provided.Type: ApplicationFiled: April 5, 2001Publication date: October 25, 2001Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Koji Shimada, Hiromi Wakasono
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Patent number: 6235165Abstract: A light quantity correction filter that can implement the desired transmittance distribution precisely and easily without complicating an exposure system, a method of making the light quantity correction filter, and a method of manufacturing a color cathode ray tube using the light quantity correction filter are provided.Type: GrantFiled: June 30, 1998Date of Patent: May 22, 2001Assignee: Matsushita Electronics CorporationInventor: Hiromi Wakasono
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Patent number: 6157124Abstract: An effective picture area A, displaying an image on the inside of a face panel, is curved and has no inflection points. An origin O marks the center of the effective picture area A on the inside of the face panel. The x-axis passes the origin O and is parallel to the long sides X.sub.a of the effective picture area. The y-axis passes the origin O and is parallel to the short sides Y.sub.a of the effective picture area. The z-axis passes the origin O and is parallel to the tube axis. Using a Cartesian coordinate system of the axes x, y, and z, the saggital height Z of any point (x, y, z) on the inner surface of the face panel 4 from the origin O in the direction of the tube is given by Z=a.sub.1 x.sup.2 +a.sub.2 x.sup.4 +a.sub.3 y.sup.2 +a.sub.4 x.sup.2 y.sup.2 +a.sub.5 x.sup.4 y.sup.2 +a.sub.6 y.sup.4 +a.sub.7 x.sup.2 y.sup.4, which describes a curved surface without inflection points.Type: GrantFiled: October 16, 1998Date of Patent: December 5, 2000Assignee: Matsushita Electronics CorporationInventor: Hiromi Wakasono
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Patent number: 5155410Abstract: A shadow mask type color cathode ray tube which has a face panel whose screen face is flattened to more than two times the flatness of the conventional flat panels without reducing the resistance of the glass bulb to outside pressure in spite of its relatively thin glass wall, and has an enhanced reflection characteristic of incident light as well as improved local doming characteristics.Type: GrantFiled: March 13, 1991Date of Patent: October 13, 1992Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiromi Wakasono, Osamu Adachi, Osamu Konosu, Shigeya Ashizaki