Patents by Inventor Mutsumi Honda
Mutsumi Honda 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: 6087287Abstract: A dielectric ceramic essentially in the form of an aggregate of crystal grains each having a ferroelectric core enclosed in a paraelectric shell. The shells are created by thermal diffusion of magnesium into the crystal grains. Through control of the firing temperature and time the thicknesses of the shells are confined in the range of approximately 5-30% of the average grain size. The resulting ceramic is low in dielectric constant and favorable in temperature characteristic of capacitance, making it suitable for use in laminated capacitors.Type: GrantFiled: September 13, 1999Date of Patent: July 11, 2000Assignee: Taiyo Yuden Co., Ltd.Inventors: Yoshiaki Iguchi, Mutsumi Honda, Hiroshi Kishi
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Patent number: 5977006Abstract: A dielectric ceramic essentially in the form of an aggregate of crystal grains each having a ferroelectric core enclosed in a paraelectric shell. The shells are created by thermal diffusion of magnesium into the crystal grains. Through control of the firing temperature and time the thicknesses of the shells are confined in the range of approximately 5-30% of the average grain size. The resulting ceramic is low in dielectric constant and favorable in temperature characteristic of capacitance, making it suitable for use in laminated capacitors.Type: GrantFiled: May 6, 1998Date of Patent: November 2, 1999Assignee: Taiyo Yuden Co., Ltd.Inventors: Yoshiaki Iguchi, Mutsumi Honda, Hiroshi Kishi
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Patent number: 5181157Abstract: A ceramic capacitor having excellent electric characteristics which includes internal electrodes essentially comprising a base metal such as Ni, and a method for fabricating the capacitor includes the step of firing under a non-oxidation atmosphere. A dielectric layer of the ceramic capacitor comprises basic and additional components. The basic component comprises a material represented by the following formula:(Ba.sub.k-(x+y) M.sub.x L.sub.y)O.sub.k (Ti.sub.1-z R.sub.z)O.sub.2-l z/2where, M is Mg and/or Zn, L is Ca and/or Sr, R is a rare earth element, and k, x, z and y are numerals fulfilling the conditions of 1.00.ltoreq.k.ltoreq.1.05, 0<x<0.10, 0<y.ltoreq.0.05, 0.01.ltoreq.x+y<0.10, and 0.002<z.ltoreq.0.06. The additional component consists comprises Li.sub.2 O )or B.sub.2 O.sub.3), SiO.sub.2 and MO (MO is at least one metal oxide selected from the group consisting of BaO, SrO, CaO, MgO and ZnO).Type: GrantFiled: October 17, 1991Date of Patent: January 19, 1993Assignee: Taiyo Yuden KabusikigaishaInventors: Hirokazu Chazono, Mutsumi Honda, Hirosi Kisi, Hirosi Saito, Hisamitsu Shizuno
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Patent number: 5111357Abstract: A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula,(Ba.sub.k-x-y M.sub.x L.sub.y)O.sub.k TiO.sub.2where M is either or both the magnesium and zinc, L is either or both of calcium and magnesium, and k, x and y are numerals in specified ranges. To this major ingredient is added a minor proportion of a first additive ingredient and a second additive ingredient. The first additive ingredient is at least either of dichromium trioxide and aluminum oxide. The second ingredient is a mixture of boric oxide or lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide. For the fabrication of capacitors the mixture of the above major ingredient and additives in finely divided form are formed into moldings of desired shape and size, each with at least two electrodes buried therein.Type: GrantFiled: October 22, 1990Date of Patent: May 5, 1992Assignee: Taiyo Yuden Company, Ltd.Inventors: Hirokazu Chazono, Hiroshi Saito, Mutsumi Honda, Hisamitsu Shizuno, Hiroshi Kishi
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Patent number: 5103370Abstract: A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula(1-.alpha.){(Ba.sub.k-x M.sub.x)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+.alpha.CaZrO.sub.3where M is either or both of magnesium and zinc, R is a rare earth element or elements, and .alpha., k, x and y are numerals in specified ranges. To this major ingredient is added a minor proportion of a first additive ingredient and a second additive ingredient. The first additive ingredient is at least either of chromium oxide and aluminum oxide. The second additive ingredient is a mixture of boric oxide or lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide.Type: GrantFiled: November 29, 1990Date of Patent: April 7, 1992Assignee: Taiyo Yuden Co., Ltd.Inventors: Hiroshi Saito, Mutsumi Honda, Hiroshi Kishi, Hisamitsu Shizuno, Hirokazu Chazono
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Patent number: 5103369Abstract: A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula,(1--.alpha.) {(Ba.sub.k-x-z M.sub.x L.sub.z)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+.alpha.CaZrO.sub.3where M is either or both of magnesium and zinc, L is either or both of calcium and magnesium, R is a rare earth element or elements, and .alpha., k, x, z and y are numerals in specified ranges. To this major ingredient is added a minor proportion of a first additive ingredient and a second additive ingredient. The first additive ingredient is at least either of chromium oxide and aluminum oxide. The second additive ingredient is a mixture of boric oxide or lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide.Type: GrantFiled: November 29, 1990Date of Patent: April 7, 1992Assignee: Taiyo Yuden Co., Ltd.Inventors: Hiroshi Saito, Mutsumi Honda, Hiroshi Kishi, Hisamitsu Shizuno, Hirokazu Chazono
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Patent number: 5089932Abstract: A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula,(1-.alpha.){(Ba.sub.k-x M.sub.x)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+.alpha.CaZrO.sub.3where M is either or both of magnesium and zinc, R is a rare earth element or elements, and .alpha., k, x and y are numerals in specified ranges. To this major ingredient is added a minor proportion of an additive. The additive is a mixture of boric oxide or lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide. For the fabrication of capacitors the mixture of the above major ingredient and additives in finely divided form are formed into moldings of desired shape and size, each with at least two electrodes buried therein.Type: GrantFiled: November 27, 1990Date of Patent: February 18, 1992Assignee: Taiyo Yuden Co., Ltd.Inventors: Hiroshi Saito, Mutsumi Honda, Hiroshi Kishi, Hisamitsu Shizuno, Hirokazu Chazono
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Patent number: 5089933Abstract: A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula(1-.alpha.){(Ba.sub.k-x M.sub.x)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+.alpha.CaZrO.sub.3where M is either or both of calcium and strontium, R is a rare earth element or elements, and .alpha., k, x and y are numerals in specified ranges. To this major ingredient is added a minor proportion of a first additive ingredient and a second additive ingredient. The first additive ingredient is at least either of chromium oxide and aluminum oxide. The second additive ingredient is a mixture of boric oxide or lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide.Type: GrantFiled: November 29, 1990Date of Patent: February 18, 1992Assignee: Taiyo Yuden Co., Ltd.Inventors: Hiroshi Saito, Mutsumi Honda, Hiroshi Kishi, Hisamitsu Shizuno, Hirokazu Chazono
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Patent number: 5077636Abstract: A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula,(1-.alpha.){(Ba.sub.k-x-z M.sub.x L.sub.z)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+.alpha.CaZrO.sub.3where M is either or both of magnesium and zinc, L is either or both of calcium and magnesium, R is a rare earth element or elements, and .alpha., k, x, z and y are numerals in specified ranges. To this major ingredient is added a minor proportion of an additive ingredient. The additive ingredient is a mixture of boric oxide or lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide. For the fabrication of capacitors the mixture of the above major ingredient and additives in finely divided form are formed into moldings of desired shape and size, each with at least two electrodes buried therein.Type: GrantFiled: November 27, 1990Date of Patent: December 31, 1991Assignee: Taiyo Yuden Co., Ltd.Inventors: Hiroshi Saito, Mutsumi Honda, Hiroshi Kishi, Hisamitsu Shizuno, Hirokazu Chazono
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Patent number: 5075819Abstract: A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula,(1-.alpha.) {(Ba.sub.k-x M.sub.x)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+.alpha.CaZrO.sub.3where M is either or both of calcium and strontium, R is a rare earth element or elements, and .alpha., k, x and y are numerals in specified ranges. To this major ingredient is added a minor proportion of an additive. The additive is a mixture of boric oxide or lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide. For the fabrication of capacitors the mixture of the above major ingredient and additives in finely divided form are formed into moldings of desired shape and size, each with at least two electrodes buried therein.Type: GrantFiled: November 27, 1990Date of Patent: December 24, 1991Assignee: Taiyo Yuden Co., Ltd.Inventors: Hiroshi Saito, Mutsumi Honda, Hiroshi Kishi, Hisamitsu Shizuno, Hirokazu Chazono
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Patent number: 5051863Abstract: A monolithic capacitor having a dielectric ceramic body sintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula(Ba.sub.k-x M.sub.x)O.sub.k TiO.sub.2where M is either or both of magnesium and zinc, and K and X are numerals in specified ranges. To this major ingredient is added a minor proportion of a first additive ingredient and a second additive ingredient. The first additive ingredient is at least either of dichromium trioxide and aluminum oxide. The second ingredient is a mixture of boric oxide or lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide. For the fabrication of capacitors the mixture of the above major ingredient and additives in finely divided form are formed into moldings of desired shape and size, each with at least two electrodes buried therein.Type: GrantFiled: October 22, 1990Date of Patent: September 24, 1991Assignee: Taiyo Yuden Co., Ltd.Inventors: Hirokazu Chazono, Hiroshi Saito, Mutsumi Honda, Hisamitsu Shizuno, Hiroshi Kishi
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Patent number: 5051864Abstract: A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula,(Ba.sub.k-x M.sub.x)O.sub.k TiO.sub.2where M is either or both of calcium and strontium, and K and X are numerals in specified ranges. To this major ingredient is added a minor proportion of a first additive ingredient and a second additive ingredient. The first additive ingredient is at least either of dichromium trioxide and aluminum oxide. The second ingredient is a mixture of boric oxide or lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide. For the fabrication of capacitors the mixture of the above major ingredient and additives in finely divided form are formed into moldings of desired shape and size, each with at least two electrodes buried therein.Type: GrantFiled: October 22, 1990Date of Patent: September 24, 1991Assignee: Taiyo Yuden Co., Ltd.Inventors: Hirokazu Chazono, Hiroshi Saito, Mutsumi Honda, Hisamitsu Shizuno, Hiroshi Kishi