Patents by Inventor Takaaki Yada
Takaaki Yada 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: 9557261Abstract: The present invention improves an S/N ratio and light intensity resolution provided by an A/D converter, and an analyzer includes: a measurement cell irradiated with light during sample measurement; a dimming element irradiated with the light during reference measurement; an amplifier configured to amplify an analog light intensity signal outputted from a light detector; an A/D converter configured to convert the analog light intensity signal into a digital light intensity signal; and an arithmetic device configured to calculate absorbance using a digital sample light intensity signal outputted from the A/D converter during the sample measurement and a digital reference light intensity signal outputted from the A/D converter during the reference measurement, wherein an amplification factor of the amplifier is set such that the analog reference light intensity signal and the analog sample light intensity signal become less than or equal to a full scale of the A/D converter.Type: GrantFiled: December 26, 2013Date of Patent: January 31, 2017Assignee: HORIBA, Ltd.Inventors: Takaaki Yada, Shun Kuroda, Issei Yokoyama, So Takagi, Yoko Nakai
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Patent number: 9339218Abstract: A concentration measuring device having a spot-application region, and a configuration capable of measuring the concentration of an object component in the sample liquid dropped on the spot-application region, the concentration measuring device including: a light irradiation device, which is provided on a side below the spot-application region, for emitting an irradiation light having a wavelength absorbable by a coloring matter in the dropped sample liquid. The irradiation light passes through the spot-application region, thereby the sample liquid dropped on the spot-application region is irradiated with the irradiation light from the side below the spot-application region. As a result, a non-covered region in the spot-application region can be easily found by visual observation. The spot-application region is composed of, for example, a through hole formed on the supporting film and a separation membrane that blocks the through hole.Type: GrantFiled: July 11, 2014Date of Patent: May 17, 2016Assignee: HORIBA, Ltd.Inventors: Tomoyuki Murata, Takao Minai, Takaaki Yada
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Patent number: 9007591Abstract: The present invention includes: an optical fiber being provided either of between a light source and a measurement cell and between the measurement cell and a light detection part; and light path switching means adapted to achieve switching between a measurement cell passage state in which a light path formed by light transmission means passes through the measurement cell and a measurement cell non-passage state in which the light path formed by the light transmission means passes through a region different from the measurement cell, wherein calibration processing for a first calibration with a long calibration cycle is performed in the measurement cell passage state, and calibration processing for a second calibration with a short calibration cycle is performed in the measurement cell non-passage state.Type: GrantFiled: November 26, 2013Date of Patent: April 14, 2015Assignee: HORIBA, Ltd.Inventors: Kimihiko Arimoto, So Takagi, Takaaki Yada
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Publication number: 20150014161Abstract: A concentration measuring device having a spot-application region, and a configuration capable of measuring the concentration of an object component in the sample liquid dropped on the spot-application region, the concentration measuring device including: a light irradiation device, which is provided on a side below the spot-application region, for emitting an irradiation light having a wavelength absorbable by a coloring matter in the dropped sample liquid. The irradiation light passes through the spot-application region, thereby the sample liquid dropped on the spot-application region is irradiated with the irradiation light from the side below the spot-application region. As a result, a non-covered region in the spot-application region can be easily found by visual observation. The spot-application region is composed of, for example, a through hole formed on the supporting film and a separation membrane that blocks the through hole.Type: ApplicationFiled: July 11, 2014Publication date: January 15, 2015Inventors: Tomoyuki Murata, Takao Minai, Takaaki Yada
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Publication number: 20140185049Abstract: The present invention improves an S/N ratio and light intensity resolution provided by an A/D converter, and an analyzer includes: a measurement cell irradiated with light during sample measurement; a dimming element irradiated with the light during reference measurement; an amplifier configured to amplify an analog light intensity signal outputted from a light detector; an A/D converter configured to convert the analog light intensity signal into a digital light intensity signal; and an arithmetic device configured to calculate absorbance using a digital sample light intensity signal outputted from the A/D converter during the sample measurement and a digital reference light intensity signal outputted from the A/D converter during the reference measurement, wherein an amplification factor of the amplifier is set such that the analog reference light intensity signal and the analog sample light intensity signal become less than or equal to a full scale of the A/D converter.Type: ApplicationFiled: December 26, 2013Publication date: July 3, 2014Applicant: HORIBA, Ltd.Inventors: Takaaki Yada, Shun Kuroda, Issei Yokoyama, So Takagi, Yoko Nakai
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Publication number: 20140146317Abstract: The present invention includes: an optical fiber being provided either of between a light source and a measurement cell and between the measurement cell and a light detection part; and light path switching means adapted to achieve switching between a measurement cell passage state in which a light path formed by light transmission means passes through the measurement cell and a measurement cell non-passage state in which the light path formed by the light transmission means passes through a region different from the measurement cell, wherein calibration processing for a first calibration with a long calibration cycle is performed in the measurement cell passage state, and calibration processing for a second calibration with a short calibration cycle is performed in the measurement cell non-passage state.Type: ApplicationFiled: November 26, 2013Publication date: May 29, 2014Applicant: HORIBA, Ltd.Inventors: Kimihiko Arimoto, So Takagi, Takaaki Yada
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Patent number: 6993444Abstract: A measuring method of determining component concentration in a solution by calculating component concentrations in the solution at various temperatures in a small number of steps. The component concentration is measured at an arbitrary temperature T by using a solution absorbance spectrum and solvent absorbance spectrum at a plurality of wavelength(s)r, and preliminarily determining a calibration coefficient Mij (TO). Concentration of Ci of component i in solution at reference temperature TO, is obtained at differential spectrum of solution spectrum S (?j, T) at temperature T in j-th wavelength ?j and solvent spectrum B (?j, T) at temperature T in j-th wavelength ?j, calculating calibration coefficient Mij (TO) the specific component concentrations.Type: GrantFiled: September 2, 2004Date of Patent: January 31, 2006Assignee: Horiba, Ltd.Inventors: Issei Yokoyama, Yoshihito Yuhara, Junji Kojima, Takaaki Yada
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Publication number: 20050065750Abstract: A measuring method of determining component concentration in a solution by calculating component concentrations in the solution at various temperatures in a small number of steps. The component concentration is measured at an arbitrary temperature T by using a solution absorbance spectrum and solvent absorbance spectrum at a plurality of wavelength(s)r, and preliminarily determining a calibration coefficient Mij (TO). Concentration of Ci of component i in solution at reference temperature TO, is obtained at differential spectrum of solution spectrum S (?j, T) at temperature T in j-th wavelength ?j and solvent spectrum B (?j, T) at temperature T in j-th wavelength ?j, calculating calibration coefficient Mij (TO) the specific component concentrations.Type: ApplicationFiled: September 2, 2004Publication date: March 24, 2005Inventors: Issei Yokoyama, Yoshihito Yuhara, Junji Kojima, Takaaki Yada
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Patent number: 5200706Abstract: A device for measuring ionic concentration in a sample liquid, having a detachable waterproof electrode housing. A body member has a computing device disposed therein and a display panel on an exterior surface. The waterproof electrode housing is demountably coupled to the body member. The electrode housing includes a flat surface sensor capable of measuring ionic concentration of the sample liquid when the device is placed on a flat surface, and is waterproof for measuring ionic concentration by immersion. A gap is formed between the body and the flat surface for preventing water from entering the body when the flat surface ionic concentration measurement procedure is being conducted.Type: GrantFiled: April 8, 1991Date of Patent: April 6, 1993Assignee: Horiba, Ltd.Inventor: Takaaki Yada
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Patent number: 4883563Abstract: A flat shaped composite electrode includes a flat substrate having a high electrical insulating property. A flat inside pair of electrodes and a flat outside pair of electrodes are fixed on the substrate. A flat support layer having a high electrical insulating property overlays the electrodes and substrate. The support layer describes two holes into which a gelatinized internal solution is placed. An ion response glass membrane is mounted on the support layer and over one hole, while a liquid junction membrane is similarly mounted over the other hole.Type: GrantFiled: October 28, 1988Date of Patent: November 28, 1989Assignee: Horiba, Ltd.Inventors: Haruo Kotani, Katsuhiko Tomita, Takaaki Yada, Tsuyoshi Nakanishi
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Patent number: 4816132Abstract: A flat shaped composite electrode includes a flat substrate having a high electrical insulating property. A flat inside pair of electrodes and a flat outside pair of electrodes are fixed on the substrate. A flat support layer having a high electrical insulating property overlays the electrodes and substrate. The support layer describes two holes into which a gelatinized internal solution is placed. An ion response glass membrane is mounted on the support layer and over one hole, while a liquid junction membrane is similarly mounted over the other hole.Type: GrantFiled: November 24, 1987Date of Patent: March 28, 1989Assignee: Horiba, Ltd.Inventors: Haruo Kotani, Katsuhiko Tomita, Takaaki Yada, Tsuyoshi Nakanishi
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Patent number: 4745358Abstract: The direction of change of an analog signal which is digitally displayed on a digital display can be immediately determined at a glance by providing a change-display in the vicinity of the digital display, which digitally displays the analog signal value. The change-display displays whether the analog input signal is increasing or decreasing by comparing the present value of the input signal with a previous value thereof. This comparison may be effected by integrating the input signal and comparing the integrated input signal with the input signal or by differentiating the input signal or by using a sample and hold circuit to hold a previous input signal value which is then compared with the present input signal value.Type: GrantFiled: January 2, 1986Date of Patent: May 17, 1988Assignee: Horiba, Ltd.Inventors: Takaaki Yada, Tadao Nakamura, Ichiro Asano