Patents by Inventor Hiroshi Tomohiro
Hiroshi Tomohiro 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: 7885779Abstract: A measurement error correcting method and electronic component characteristic measuring device capable of accurately coping with an electronic component which includes nonsignal line ports and whose electrical characteristics are changed by a jig. The method includes the steps of measuring an electrical characteristic, with correcting-data-acquisition samples mounted on a test jig enabling measuring nonsignal line ports, and the samples mounted on a reference jig; measuring a through device in which a signal line port and a nonsignal line port are electrically connected to each other; determining a numerical expression for calculating, from results of measurement on the test jig, an estimated electrical characteristic value obtained on the reference jig; measuring an arbitrary electronic component, on the test jig; and calculating the estimated electrical characteristic value obtained on the reference jig.Type: GrantFiled: November 27, 2006Date of Patent: February 8, 2011Assignee: Murata Manufacturing Co., Ltd.Inventors: Taichi Mori, Gaku Kamitani, Hiroshi Tomohiro
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Publication number: 20070084035Abstract: A measurement error correcting method and electronic component characteristic measuring device capable of accurately coping with an electronic component which includes nonsignal line ports and whose electrical characteristics are changed by a jig.Type: ApplicationFiled: November 27, 2006Publication date: April 19, 2007Inventors: Taichi Mori, Gaku Kamitani, Hiroshi Tomohiro
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Patent number: 6772491Abstract: A manufacturing method for a ceramic oscillator capable of controlling the oscillation frequency with a high accuracy is disclosed. In this method, a mother substrate is polarized, electrodes in discrete ceramic oscillator units are formed, the mother substrate is cut into discrete ceramic oscillator units, an outer package is applied to each of the ceramic oscillators, and thus a ceramic oscillator as a finished product is achieved. Herein, the polarization processing for the mother substrate is executed by finishing the application of a high DC voltage, when the antiresonant frequency fa of the mother substrate in a thickness vibration mode is measured while the voltage is applied to the mother substrate, and the antiresonant frequency fa which is being measured has reached a target value of the antiresonant frequency of the mother substrate during polarization corresponding to a target oscillation frequency of the ceramic oscillator as a finished product.Type: GrantFiled: December 20, 2001Date of Patent: August 10, 2004Assignee: Murata Manufacturing Co., Ltd.Inventors: Naoki Fujii, Hiroshi Tomohiro, Mikio Nakajima, Keiichi Kami
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Patent number: 6628042Abstract: In order to polarize a piezoelectric material in high-temperature gas, a temperature-raising portion raises the temperature of the piezoelectric material to a temperature required to polarize the piezoelectric material. A constant-temperature bath has an atmosphere of the temperature of which is kept at the required temperature, and incorporates a polarizing portion that polarizes the piezoelectric material whose temperature is kept at the required temperature. When the temperature of the piezoelectric material is raised quickly to the temperature required to polarize the piezoelectric material by the temperature raising portion and is placed into the constant-temperature bath, the temperature of the piezoelectric material is at a temperature near a set temperature of the inside of the constant-temperature bath, so that the piezoelectric material can be polarized in a short period of time with high precision.Type: GrantFiled: December 4, 2001Date of Patent: September 30, 2003Assignee: Murata Manufacturing Co., Ltd.Inventor: Hiroshi Tomohiro
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Patent number: 6521166Abstract: A DC voltage is applied to a piezoelectric body for polarization treatment in the air and in an atmosphere with a temperature equal to or higher than an aging temperature, and then, the piezoelectric body is aged at the aging temperature. The polarization degree is determined based on the frequency characteristic while the piezoelectric body is polarized. The application of the DC voltage is stopped at the time when the measured polarization degree reaches a set level. The set level is determined based on a correlation between the polarization degree obtained immediately before the application of the DC voltage is stopped and the stable polarization degree obtained after the aging and the ordinary temperature restoration following the stop of the voltage application.Type: GrantFiled: August 11, 2000Date of Patent: February 18, 2003Assignee: Murata Manufacturing Co., Ltd.Inventors: Hiroshi Tomohiro, Naoki Fujii
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Patent number: 6464925Abstract: A method of polarization-treating a piezoelectric body, which is constructed such that current flows through the piezoelectric body in response to application of a DC voltage to the piezoelectric body, includes the steps of measuring current flowing through the piezoelectric body, and stopping the application of the DC voltage at the time when the measured current value reaches a set level. The polarization degree is controlled based on the current value by utilization of a correlation between the current and the polarization degree during polarization. With this method, a desired polarization degree is obtained, and dispersion of the polarization is reduced.Type: GrantFiled: August 12, 2000Date of Patent: October 15, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Hiroshi Tomohiro, Naoki Fujii
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Publication number: 20020089265Abstract: In order to polarize a piezoelectric material in high-temperature gas, a temperature-raising portion raises the temperature of the piezoelectric material to a temperature required to polarize the piezoelectric material. A constant-temperature bath has an atmosphere of the temperature of which is kept at the required temperature, and incorporates a polarizing portion that polarizes the piezoelectric material whose temperature is kept at the required temperature. When the temperature of the piezoelectric material is raised quickly to the temperature required to polarize the piezoelectric material by the temperature raising portion and is placed into the constant-temperature bath, the temperature of the piezoelectric material is at a temperature near a set temperature of the inside of the constant-temperature bath, so that the piezoelectric material can be polarized in a short period of time with high precision.Type: ApplicationFiled: December 4, 2001Publication date: July 11, 2002Inventor: Hiroshi Tomohiro
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Publication number: 20020084862Abstract: A manufacturing method for a ceramic oscillator capable of controlling the oscillation frequency with a high accuracy is disclosed. In this method, a mother substrate is polarized, electrodes in discrete ceramic oscillator units are formed, the mother substrate is cut into discrete ceramic oscillator units, an outer package is applied to each of the ceramic oscillators, and thus a ceramic oscillator as a finished product is achieved. Herein, the polarization processing for the mother substrate is executed by finishing the application of a high DC voltage, when the antiresonant frequency fa of the mother substrate in a thickness vibration mode is measured while the voltage is applied to the mother substrate, and the antiresonant frequency fa which is being measured has reached a target value of the antiresonant frequency of the mother substrate during polarization corresponding to a target oscillation frequency of the ceramic oscillator as a finished product.Type: ApplicationFiled: December 20, 2001Publication date: July 4, 2002Inventors: Naoki Fujii, Hiroshi Tomohiro, Mikio Nakajima, Keiichi Kami
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Patent number: 6403012Abstract: In a method of polarization-treating a piezoelectric material, the maximum polarization degree &Dgr;f180max achieved by 180° rotation is determined. A residual polarization degree &Dgr;f as a target value and the maximum polarization degree &Dgr;f180max are compared. In the case of &Dgr;f≦&Dgr;f180max, a determination is made as to the temperature TA for obtaining the polarization degree &Dgr;f made up solely of the polarization degree achieved by 180° rotation. Half-polarization is carried out at the temperature TA, and aging is conducted at the temperature TA, whereby a piezoelectric material of which the ratio of the polarization achieved by 180° rotation is 100%, which is stable thermally with passage of time, and has a polarization degree &Dgr;f correctly coincident with a target value, can be obtained.Type: GrantFiled: December 7, 1999Date of Patent: June 11, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Hiroshi Tomohiro, Naoki Fujii