Patents by Inventor Naotoshi Hakamata
Naotoshi Hakamata 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: 11723534Abstract: An object is to simply and easily evaluate differences in behavior of the eyes of subjects. A binocular measurement system 1 includes a photodetector 7 that detects reflected light from the right eye ER and the left eye EL of a subject, and outputs image signal of the reflected light, a feature amount calculating unit 11 that calculates a feature amount corresponding to the right eye ER and a feature amount corresponding to the left eye EL based on the image signal, and a comparison value calculating unit 13 that calculates, based on the two feature amounts, a comparison value obtained by comparing the two feature amounts.Type: GrantFiled: November 17, 2020Date of Patent: August 15, 2023Assignee: HAMAMATSU PHOTONICS K.K.Inventors: Kazutaka Suzuki, Munenori Takumi, Naotoshi Hakamata, Haruyoshi Toyoda, Yoshinori Matsui
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Publication number: 20210068653Abstract: An object is to simply and easily evaluate differences in behavior of the eyes of subjects. A binocular measurement system 1 includes a photodetector 7 that detects reflected light from the right eye ER and the left eye EL of a subject, and outputs image signal of the reflected light, a feature amount calculating unit 11 that calculates a feature amount corresponding to the right eye ER and a feature amount corresponding to the left eye EL based on the image signal, and a comparison value calculating unit 13 that calculates, based on the two feature amounts, a comparison value obtained by comparing the two feature amounts.Type: ApplicationFiled: November 17, 2020Publication date: March 11, 2021Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Kazutaka SUZUKI, Munenori TAKUMI, Naotoshi HAKAMATA, Haruyoshi TOYODA, Yoshinori MATSUI
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Patent number: 10893800Abstract: An object is to simply and easily evaluate differences in behavior of the eyes of subjects. A binocular measurement system 1 includes a photodetector 7 that detects reflected light from the right eye ER and the left eye EL of a subject, and outputs image signal of the reflected light, a feature amount calculating unit 11 that calculates a feature amount corresponding to the right eye ER and a feature amount corresponding to the left eye EL based on the image signal, and a comparison value calculating unit 13 that calculates, based on the two feature amounts, a comparison value obtained by comparing the two feature amounts.Type: GrantFiled: March 30, 2016Date of Patent: January 19, 2021Assignee: HAMAMATSU PHOTONICS K.K.Inventors: Kazutaka Suzuki, Munenori Takumi, Naotoshi Hakamata, Haruyoshi Toyoda, Yoshinori Matsui
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Patent number: 10722112Abstract: A tablet terminal 1A is a measurement apparatus for measuring a subject's eyelid position, and includes a display section 3 that generates a vertically long light emitting region to make a reflection image form on a corneal surface of the subject's eyeball, a camera 5 that images the reflection image formed by the display section 3, and an arithmetic circuit 7 that derives reflection image information concerning a size or position of the reflection image based on image data of the reflection image obtained by the camera 5, and measures the eyelid position based on the reflection image information.Type: GrantFiled: November 14, 2014Date of Patent: July 28, 2020Assignee: HAMAMATSU PHOTONICS K.K.Inventors: Kazutaka Suzuki, Yoshinori Matsui, Haruyoshi Toyoda, Munenori Takumi, Naotoshi Hakamata
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Patent number: 10478063Abstract: An eyeblink measurement system 10 is a measurement apparatus for measuring a subject's eyelid position, and includes a lighting device 1 that irradiates light extending across upper to lower eyelids of the subject's eye region E, and an image measurement device 2 that has an optical axis Ia on a plane for which a plane including an irradiation optical axis La of the light is rotated by a predetermined angle ? around an axis A1 along the light to be irradiated onto the subject, obtains height information based on the position of an optical image of the light in an image imaged, and measures the eyelid position based on the height information.Type: GrantFiled: November 14, 2014Date of Patent: November 19, 2019Assignee: HAMAMATSU PHOTONICS K.K.Inventors: Yoshinori Matsui, Kazutaka Suzuki, Haruyoshi Toyoda, Munenori Takumi, Naotoshi Hakamata
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Publication number: 20180125357Abstract: An object is to simply and easily evaluate differences in behavior of the eyes of subjects. A binocular measurement system 1 includes a photodetector 7 that detects reflected light from the right eye ER and the left eye EL of a subject, and outputs image signal of the reflected light, a feature amount calculating unit 11 that calculates a feature amount corresponding to the right eye ER and a feature amount corresponding to the left eye EL based on the image signal, and a comparison value calculating unit 13 that calculates, based on the two feature amounts, a comparison value obtained by comparing the two feature amounts.Type: ApplicationFiled: March 30, 2016Publication date: May 10, 2018Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Kazutaka SUZUKI, Munenori TAKUMI, Naotoshi HAKAMATA, Haruyoshi TOYODA, Yoshinori MATSUI
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Publication number: 20160345818Abstract: An eyeblink measurement method includes a step of detecting reflected light from a part including a target person's eyelid and eye and outputting an image signal of the reflected light, using a photodetector, a step of calculating a position of a corneal reflected light produced on the eye in the part and a position of the eyelid in the part based on the image signal, a step of correcting the position of the eyelid based on the position of the corneal reflected light, and a step of calculating a feature amount regarding blinking based on a temporal change in the corrected position of the eyelid.Type: ApplicationFiled: May 25, 2016Publication date: December 1, 2016Inventors: Kazutaka SUZUKI, Munenori TAKUMI, Naotoshi HAKAMATA, Haruyoshi TOYODA, Yoshinori MATSUI
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Publication number: 20160317033Abstract: An eyeblink measurement system 10 is a measurement apparatus for measuring a subject's eyelid position, and includes a lighting device 1 that irradiates light extending across upper to lower eyelids of the subject's eye region E, and an image measurement device 2 that has an optical axis Ia on a plane for which a plane including an irradiation optical axis La of the light is rotated by a predetermined angle ? around an axis A1 along the light to be irradiated onto the subject, obtains height information based on the position of an optical image of the light in an image imaged, and measures the eyelid position based on the height information.Type: ApplicationFiled: November 14, 2014Publication date: November 3, 2016Inventors: Yoshinori MATSUI, Kazutaka SUZUKI, Haruyoshi TOYODA, Munenori TAKUMI, Naotoshi HAKAMATA
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Publication number: 20160302662Abstract: A tablet terminal 1A is a measurement apparatus for measuring a subject's eyelid position, and includes a display section 3 that generates a vertically long light emitting region to make a reflection image form on a corneal surface of the subject's eyeball, a camera 5 that images the reflection image formed by the display section 3, and an arithmetic circuit 7 that derives reflection image information concerning a size or position of the reflection image based on image data of the reflection image obtained by the camera 5, and measures the eyelid position based on the reflection image information.Type: ApplicationFiled: November 14, 2014Publication date: October 20, 2016Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Kazutaka SUZUKI, Yoshinori MATSUI, Haruyoshi TOYODA, Munenori TAKUMI, Naotoshi HAKAMATA
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Patent number: 7407287Abstract: A pupil measuring apparatus comprises a mark 1d placed in a space where a background is observable from the two eyes E; a mark moving device 1e for moving the mark 1d between the two eyes E and the background; an illumination optical system 1g for illuminating the two eyes E from the background side; two cameras A, B for respectively imaging the two pupils PP; calculating means 2a to 2e for calculating areas or diameters of the respective pupils thus imaged, from video signals of the two cameras A, B; and a display 3 for providing an output of a graph of change in the areas or diameters calculated against a position of the mark 1d or a time associated with the position on a single screen.Type: GrantFiled: April 10, 2006Date of Patent: August 5, 2008Assignee: Hamamatsu Photonics K.K.Inventor: Naotoshi Hakamata
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Publication number: 20060181679Abstract: A pupil measuring apparatus comprises a mark 1d placed in a space where a background is observable from the two eyes E; a mark moving device 1e for moving the mark 1d between the two eyes E and the background; an illumination optical system 1g for illuminating the two eyes E from the background side; two cameras A, B for respectively imaging the two pupils PP; calculating means 2a to 2e for calculating areas or diameters of the respective pupils thus imaged, from video signals of the two cameras A, B; and a display 3 for providing an output of a graph of change in the areas or diameters calculated against a position of the mark 1d or a time associated with the position on a single screen.Type: ApplicationFiled: April 10, 2006Publication date: August 17, 2006Inventor: Naotoshi Hakamata
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Patent number: 7083280Abstract: A pupil measuring apparatus includes a mark placed in a space where a background is observable by both eyes; a mark moving device for moving the mark between the eyes and the background; an illumination optical system for illuminating the eyes from the background side; two cameras for respectively imaging the pupils of the eyes; a calculating means for calculating areas or diameters of the respective pupils thus imaged, from video signals of the two cameras; and a display for providing an output of a graph showing change in the areas or diameters of the two pupils calculated against a position of the mark or a time associated with the position on a single screen.Type: GrantFiled: January 6, 2003Date of Patent: August 1, 2006Assignee: Hamamatsu Photonics K.K.Inventor: Naotoshi Hakamata
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Publication number: 20030098951Abstract: A pupil measuring apparatus comprises a mark 1d placed in a space where a background is observable from the two eyes E; a mark moving device 1e for moving the mark 1d between the two eyes E and the background; an illumination optical system 1g for illuminating the two eyes E from the background side; two cameras A, B for respectively imaging the two pupils PP; calculating means 2a to 2e for calculating areas or diameters of the respective pupils thus imaged, from video signals of the two cameras A, B; and a display 3 for providing an output of a graph of change in the areas or diameters calculated against a position of the mark 1d or a time associated with the position on a single screen.Type: ApplicationFiled: January 6, 2003Publication date: May 29, 2003Applicant: HAMAMATSU PHOTONICS K.K.Inventor: Naotoshi Hakamata
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Patent number: 5103829Abstract: An examination apparatus for measuring the oxygenation in body organs by the near infrared light transmission spectrophotometry. The invention relates to an improvement of an illumination-side fixture and a detection-side fixture. In order to hold optical fibers for introducing infrared light in their natural conditions, the fixtures are equipped with respective prisms for changing light paths by prescribed angles. Also, the fixtures are equipped with respective light-emitting diodes for indicating if the examination apparatus is in its operating condition.Type: GrantFiled: May 2, 1988Date of Patent: April 14, 1992Assignee: Hamamatsu Photonics Kabushiki KaishaInventors: Susumu Suzuki, Sumio Yagi, Naotoshi Hakamata, Takeo Ozaki
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Patent number: 4908762Abstract: An examination apparatus measures the oxygenation in body organs by the near infrared light transmission spectrophotometry. To inspect the examination apparatus itself before the oxygenation measurement, an illumination-side fixture and a detection-side fixture have such structures that these fixtures can be assembled together in such a manner that near infrared light is directly made incident on the detection-side fixture from the illumination-side fixture. In the midst of the measurement, the examination apparatus is regularly inspected and a photomultiplier tube can be separately inspected by employing a separate light source for inspection.Type: GrantFiled: May 2, 1988Date of Patent: March 13, 1990Assignee: Hamamatsu Photonics Kabushiki KaishaInventors: Susumu Suzuki, Sumio Yagi, Naotoshi Hakamata, Takeo Ozaki
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Patent number: 4907876Abstract: An examination apparatus which measures the oxygenation in objects with near infrared light transmission spectrophotometry and that automatically adjusts a transmission light quantity to a magnitude suitable for detection by a photomultiplier tube. The examination apparatus comprises a ring-like ND filter whose transmission factor varies along its circumference, a filter driver for automatically setting a transmission factor of a filter, and a light source control device for automatically controlling output powers of light sources.Type: GrantFiled: May 2, 1988Date of Patent: March 13, 1990Assignee: Hamamatsu Photonics Kabushiki KaishaInventors: Susumu Suzuki, Sumio Yagi, Naotoshi Hakamata, Takeo Ozaki
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Patent number: 4901238Abstract: An examination apparatus measures the oxygenation of body organs by using the near infrared transmission spectrophotometry. To assure the measurement reliability and the object person's safety, the examination apparatus monitors the variation of the fitting position of an illumination-side fixture by detecting the reflection light quantity from the measuring object.Type: GrantFiled: May 2, 1988Date of Patent: February 13, 1990Assignee: Hamamatsu Photonics Kabushiki KaishaInventors: Susumu Suzuki, Sumio Yagi, Naotoshi Hakamata, Takeo Ozaki