Patents by Inventor Hiroshi Kagata
Hiroshi Kagata 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: 20010051584Abstract: A dielectric ceramic composition including at least a first component containing Al2O3, MgO and ROa (R is at least one element selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Tb and Gd; a is a value stoichiometrically determined in accordance with the valence of R); SiO2 as a second component; and a third component containing a glass composition including two or more components containing at least one selected from the group consisting of SiO2 and B2O3. A dielectric ceramic composition stably has a high strength in a high frequency band such as microwave, millimeter wave, etc., and has a small dielectric constant, a low loss, and a small temperature constant at capacitance.Type: ApplicationFiled: April 20, 2001Publication date: December 13, 2001Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Kenji Harada, Hiroshi Kagata, Hidenori Katsumura
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Publication number: 20010045876Abstract: A dielectric laminated device, has a layered product including a plurality of dielectric layers; andType: ApplicationFiled: May 23, 2001Publication date: November 29, 2001Inventors: Emiko Kawahara, Toru Yamada, Hiroshi Kagata
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Publication number: 20010035253Abstract: To provide a flat ceramic sintered body without warp and waviness, and a method of producing the same.Type: ApplicationFiled: June 15, 1999Publication date: November 1, 2001Inventors: KOUJI KAWAKITA, HIROSHI KAGATA, MARIKO ISHIKAWA
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Patent number: 6310525Abstract: By using a method for manufacturing a dielectric laminated device, an opening is formed on a first dielectric sheet, a strip line and an input and output line including an input and output electrode are formed by burying electrode materials in said opening, the first dielectric sheet is laminated with the second and third dielectric sheets disposed above and below respectively to form a laminate, a first and second shield electrodes and a ground electrode are formed, an end of the strip line is connected to the ground electrode, the first shield electrode and the second shield electrode are mutually connected through the ground electrode, and the input and output electrode is exposed along the line direction of the strip line. By this constitution of the above dielectric laminated device, the mounting reliability of the dielectric laminated device can be further increased.Type: GrantFiled: July 19, 1999Date of Patent: October 30, 2001Assignee: Matsushita Electric Industrial Co. Ltd.Inventors: Hideaki Nakakubo, Toshio Ishizaki, Toru Yamada, Hiroshi Kagata, Tatsuya Inoue, Shoichi Kitazawa
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Patent number: 6258462Abstract: A dielectric ceramic composition used in a high frequency band such as microwave or millimeter wave, etc., and having a low dielectric constant, low loss and small absolute value of the temperature coefficient at resonance frequency. The dielectric ceramic composition comprises Al2O3, MgO and ROn. The Al2O3, MgO and ROn are expressed by a composition formula: xAlO3/2—YMgO—zROn (R is at least one element selected from La, Ce, Pr, Nd, Sm, Eu, Gd and Tb; and n is a value stoichiometrically determined in accordance with the valence of the R), wherein x≧55, y≧0.5, z≧0.5 and x+y+z=100. A dielectric ceramic comprising a crystal phase and a glass phase also is provided. The crystal phase includes a magneto-plumbite phase that includes Al2O3.Type: GrantFiled: April 6, 1999Date of Patent: July 10, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroshi Kagata, Hidenori Katsumura
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Patent number: 6227051Abstract: An acceleration sensor has a piezoelectric element which includes a piezoelectric member layer in which a plurality of piezoelectric members are stacked and electrodes which are disposed in major opposed surfaces of the piezoelectric member layer; and a support member for supporting the piezoelectric element, wherein some piezoelectric members of the piezoelectric member layer are polarized. The electrodes are disposed in both surfaces of the polarized piezoelectric members. Capacitors which are formed by the polarized piezoelectric members and the electrodes in both surfaces of the polarized piezoelectric members are connected parallel to each other.Type: GrantFiled: March 21, 2000Date of Patent: May 8, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tetsuro Otsuchi, Katsu Takeda, Katsunori Moritoki, Osamu Kawasaki, Junichi Kato, Kouji Kawakita, Hiroshi Kagata
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Patent number: 6154356Abstract: A laminated ceramic device formed by laminating ceramics and conductive metals having a conductor section at a part of at least one of its upper and lower surfaces, in which the difference in level between the conductor section and the section other than the conductor section is smaller than the thickness of the conductor section. Consequently, even in the case of arranging the pattern conductors on both the upper and the lower surfaces of the device, a laminated ceramic device can be obtained in which pattern conductors can be arranged with high accuracy at low cost, no special care is required in the case of polishing, and the thickness accuracy and the bond strength of electrodes are high.Type: GrantFiled: September 10, 1998Date of Patent: November 28, 2000Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroshi Kagata, Kouji Kawakita, Tatsuya Inoue, Hiroshi Sogou
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Patent number: 6050144Abstract: An acceleration sensor has a piezoelectric element which includes a piezoelectric member layer in which a plurality of piezoelectric members are stacked and electrodes which are disposed in major opposed surfaces of the piezoelectric member layer; and a support member for supporting the piezoelectric element, wherein some piezoelectric members of the piezoelectric member layer are polarized, the electrodes are disposed in the both surfaces of the polarized piezoelectric members, capacitors which are formed by the polarized piezoelectric members and the electrodes in the both surfaces of the polarized piezoelectric members are connected parallel to each other.Type: GrantFiled: June 3, 1998Date of Patent: April 18, 2000Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tetsuro Otsuchi, Katsu Takeda, Katsunori Moritoki, Osamu Kawasaki, Junichi Kato, Kouji Kawakita, Hiroshi Kagata
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Patent number: 6020798Abstract: By using a method for manufacturing a dielectric laminated device, an opening is formed on a first dielectric sheet, a strip line and an input and output line including an input and output electrode are formed by burying electrode materials in said opening, the first dielectric sheet is laminated with the second and third dielectric sheets disposed above and below respectively to form a laminate, a first and second shield electrodes and a ground electrode are formed, an end of the strip line is connected to the ground electrode, the first shield electrode and the second shield electrode are mutually connected through the ground electrode, and the input and output electrode is exposed along the line direction of the strip line. By this constitution of the above dielectric laminated device, the mounting reliability of the dielectric laminated device can be further increased.Type: GrantFiled: July 15, 1997Date of Patent: February 1, 2000Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hideaki Nakakubo, Toshio Ishizaki, Toru Yamada, Hiroshi Kagata, Tatsuya Inoue, Shoichi Kitazawa
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Patent number: 5929727Abstract: A coaxial dielectric resonator which is prismatic and has a through hole in a vertical direction, has such feature that each base side of said prism being no more than 1.6 mm, a diameter of said through hole being no more than 0.8 mm, said coaxial dielectric resonator having an electrode portion on a surface thereof and on an inner surface of said through hole.Type: GrantFiled: October 10, 1997Date of Patent: July 27, 1999Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroshi Kagata, Tatsuya Inoue, Junichi Kato, Hiroshi Sogo
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Patent number: 5824616Abstract: The invention provides a dielectric ceramic composition represented by Formula 1:(1-x)Re.sub.1+a (A.sub.2/3 Nb.sub.1/3)O.sub.3+1.5a -xB.sub.1+b TiO.sub.3+bFormula 1wherein Re represents a component comprising a rare earth element, A represents a component comprising at least one element selected from the group consisting of Mg and Zn, B represents a component comprising Ca, x represents a number in the range of 0.40 to 0.80, a represents a number in the range of 0 to 0.15, and b represents a number in the range of 0 to 0.08. The composition has a high relative permittivity, a Q value and a small resonant frequency temperature coefficient. The composition is useful in miniaturizing dielectric resonators.Type: GrantFiled: February 22, 1996Date of Patent: October 20, 1998Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroshi Kagata, Junichi Kato, Keiji Nishimoto
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Patent number: 5769988Abstract: A method of manufacturing a ceramic electronic component having a dielectric ceramic and a conductor containing Ag as a main component, wherein a dielectric resonator with a high Q value is produced by heat treating at 400.degree. C. or more in an atmosphere containing 10% or less by volume of oxygen after sintering the dielectric ceramic. Using a BaO--TiO.sub.2 --Nd.sub.2 O.sub.3 --Bi.sub.2 O.sub.3 based composition (.epsilon..sub.r =92, Qf=5000 GHz) as a dielectric, a coaxial type dielectric ceramic is produced by granulating calcined powder of the dielectric and then compacting the powder, followed by sintering. A dielectric resonator of .lambda./4 is produced by coating the dielectric ceramic with Ag paste at a position other than either the upper or lower side and then burning the paste. Thereafter, the electrodes(1,4) are formed by burning the paste at 400.degree. C. or more in an atmosphere containing 10% or less by volume of oxygen.Type: GrantFiled: November 20, 1996Date of Patent: June 23, 1998Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroshi Kagata, Ichiro Kameyama, Tatsuya Inoue, Junichi Kato
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Patent number: 5629252Abstract: A dielectric ceramic composition that can be sintered at a low temperature of around 1000.degree. C. and also can have a high dielectric constant, a high Q value and small temperature coefficient at a resonant frequency includes a glass component that promotes sintering. The dielectric ceramics include: the main component comprising calcium oxide, magnesium oxide, niobium oxide and titanium oxide and expressed by the Formula: Ca{(Mg.sub. 1/3 Nb.sub. 2/3).sub.1-x Ti.sub.x }O.sub.3 (wherein X is more than 0 not more than 0.50) within the range of not less than 40 parts by weight nor more than 98 parts by weight; the accessory component comprising at least one selected from SiO.sub.2 and B.sub.2 O.sub.3 within the range of not less than 2 parts by weight nor more than 60 parts by weight; and at least one oxide selected from the group consisting of MgO, NiO, CuO, MNO.sub.2 and WO.sub.3 within the range of not less than 0.1 parts by weight nor more than 10 parts by weight.Type: GrantFiled: June 13, 1996Date of Patent: May 13, 1997Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Keiji Nishimoto, Hiroshi Kagata, Junichi Kato, Tatsuya Inoue
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Patent number: 5525562Abstract: This invention provides a dielectric ceramic compound for microwave use which has a high dielectric constant and a high Q value, and which also has a small temperature coefficient of a resonant frequency. The dielectric ceramic compound comprising a compound represented by Formula 1 at least includes calcium oxide, magnesium oxide, zinc oxide, niobium oxide, tantalum oxide, and titanium oxide, (Formula 1)Ca[{(Mg.sub.1-x Zn.sub.x).sub.1/3 (Nb.sub.1-z Ta.sub.z).sub.2/3 }.sub.1-y Ti.sub.y ]O.sub.3wherein x and y are present within an area formed by the following apexes A, B, C, and D, excluding an area on straight line AB,A: (x, y)=(0.0, 0.0)B: (x, y)=(0.0, 0.5)C: (x, y)=(1.0, 0.55)D: (x, y)=(1.0, 0.0)and z is present in the range of 0.0.ltoreq.z.ltoreq.1.0, excluding z=1.0 when y=0.0.Type: GrantFiled: December 27, 1994Date of Patent: June 11, 1996Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroshi Kagata, Junichi Kato, Keiji Nishimoto
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Patent number: 5484753Abstract: This invention provides a dielectric ceramic composition which has a high dielectric constant and a high Q value, and also has lower temperature coefficient of resonance frequency. The dielectric ceramic composition is attained by sintering composition which comprises a first component from 40 to 98 wt % and a second component from 2 to 60 wt %. The first component is represented by the following formula,Ca{(Mg.sub.1/3 Nb.sub.2/3).sub.1-x Ti.sub.x }O.sub.3where 0.ltoreq.x.ltoreq.0.50. The second component includes at least one element selected from the group consisting of SiO.sub.2 and B.sub.2 O.sub.3.Type: GrantFiled: February 10, 1995Date of Patent: January 16, 1996Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroshi Kagata, Junichi Kato, Tatsuya Inoue, Ichiro Kameyama, Keiji Nishimoto
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Patent number: 5459115Abstract: The dielectric composition according to the present invention is used in a microwave band and is characterized in having a low sintering temperature and a property to be controllable independently in the respect of a dielectric constant and a temperature coefficient of the resonant frequency.The dielectric composition is represented by the formula:A.sub.1+a BO.sub.3+a (a.ltoreq.0)wherein A site mainly contains at least Pb atom and Ca atom which is more than 20 wt % of A and further may contain Sr or Ba atom, and B site mainly contains Fe and Nb atoms and further contains at least one atom selected from the group comprising Ti and W and may contain at least one atom selected from the group comprising Cr, Mn, Co, Ni, Cu, Zn, Si, Al, Mg, Bi and Sb.Type: GrantFiled: September 22, 1993Date of Patent: October 17, 1995Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroshi Kagata, Tatsuya Inoue, Ichiro Kameyama, Junichi Kato, Keiji Nishimoto
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Patent number: 5350639Abstract: Dielectric ceramics a microwave device made of (Bi.sub.2 O.sub.3).sub..times. (Nb.sub.2 O.sub.5).sub.1-x includes at least one of subcomponents of CuO and V.sub.2 O.sub.5, wherein the composition ratio x is fallen into a range of 0.48.ltoreq..times..ltoreq.0.51, an atomic ratio AR1 defined by the following equation:AR1=(the number of Cu atoms of the CuO)/ARO,whereARO=(the number of Bi atoms of the (Bi.sub.2 O.sub.3).sub.x (Nb.sub.2 O.sub.5).sub.1-x)+(the number of Nb atoms of the (Bi.sub.2 O.sub.3).sub.x (Nb.sub.2 O.sub.5).sub.1-x)is fallen into a range of 0<AR1< 0.01, and another atomic ratio AR2 defined by the following equation:AR2=(the number of V atoms of the V.sub.2 O.sub.5)/AROis fallen into a range of 0<AR2.ltoreq. 0.02.Type: GrantFiled: September 8, 1992Date of Patent: September 27, 1994Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tatsuya Inoue, Hiroshi Kagata, Junichi Kato, Ichiro Kameyama
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Patent number: 5273944Abstract: A dielectric ceramic composition which consists essentially of bismuth oxide, calcium oxide and niobium oxide, wherein when the dielectric ceramic composition is expressed by a formula xBiO.sub.3/2 -yCaO-zNbO.sub.5/2 and the x, y and z are plotted in a ternary system diagram so as to total 1.0, the x, y and z fall in a region enclosed by a pentagon having the following vertexes A, B, C, D and E,A: (x, y, z)=(0.55, 0.16, 0.29)B: (x, y, z)=(0.5, 0.21, 0.29)C: (x, y, z)=(0.44, 0.24, 0.32)D: (x, y, z)=(0.44, 0.2, 0.36) andE: (x, y, z)=(0.5, 0.175, 0.325); anda multilayer microwave device including a dielectric layer formed by the dielectric ceramic composition.Type: GrantFiled: February 8, 1993Date of Patent: December 28, 1993Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroshi Kagata, Tatsuya Inoue, Junichi Kato, Ichiro Kameyama
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Patent number: 5273943Abstract: A dielectric ceramic composition which consists essentially of a sintered mixture represented by the formulaxBiO.sub.3/2 -y[(Ca.sub.1-a-b Zn.sub.a Pb.sub.b)O]-zNbO.sub.5/2wherein x, y and z independently represent a molar fraction and x+y+z=1, x, y and z are within a pentagonal range surrounded by lines, inclusive, plotted between points, A, B, C, D and E in a ternary ceramic composition of FIG. 1 where a is an atomic ratio of substituted Zn to Ca and b is an atomic ratio of substituted Pb to Ca, and 0<a.ltoreq.0.6 and 0.ltoreq.b.ltoreq.0.4. The points A, B, C, D and E, respectively, correspond to those points of (x, y, z)=(0.55, 0.16, 0.29), (x, y, z)=(0.5, 0.21, 0.29), (x, y, z)=(0.5, 0.175, 0.325), (x, y, z)=(0.345, 0.28, 0.375), and (x, y, z)=(0.345, 0.245, 0.41). Microwave devices making use of the ceramic composition are also described.Type: GrantFiled: February 24, 1993Date of Patent: December 28, 1993Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Ichirou Kameyama, Hiroshi Kagata, Tatsuya Inoue, Junichi Kato
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Patent number: 5219809Abstract: A dielectric ceramic composition possessing a high relative dielectric constant, a high unloaded Q, and an excellent temperature characteristic is expressed as xPbO-yZrO.sub.2 -zCaO, in the relation of x+y+z=1, wherein x, y, z are in mol percentage ranges of 0.125.ltoreq.x.ltoreq.0.49, 0.4.ltoreq.y.ltoreq.0.6, 0.11 .ltoreq.z.ltoreq.0.275. A part of ZrO.sub.2 of the composition formula may be replaced by (B1B2)0.sub.2 (where B1 is Mg, Ca, Zn, Co, Ni, Mn, Cu, Al, Ga, or Y, and B2 is Nb, Ta, or W), or Sn.Type: GrantFiled: July 2, 1991Date of Patent: June 15, 1993Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Junichi Kato, Hiroshi Kagata