Patents by Inventor Masaaki Hanebuchi
Masaaki Hanebuchi 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: 7416301Abstract: An eye refractive power measurement apparatus capable of measuring even an eye with a small pupil diameter with accuracy and stability. The apparatus has a measurement optical system including a projection optical system, having a light source, for projecting spot-shaped measurement light onto a fundus and a photo-receiving optical system, having a photodetector, for photo-receiving the measurement light reflected from the fundus via a peripheral pupillary portion, a calculation part which obtains the eye reflective power based on an output from the photodetector, alight deflection member, an arrangement of which in the measurement optical system being prevented from having a positional relationship optically approximately conjugate with a pupil, and a rotation unit which rotates the light deflection member about a measurement optical axis of the measurement optical system.Type: GrantFiled: December 17, 2004Date of Patent: August 26, 2008Assignee: Nidek Co., Ltd.Inventors: Masaaki Hanebuchi, Mitsuhiro Gono
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Patent number: 7370968Abstract: An ocular depth dimension measurement apparatus capable of accurately obtaining an ocular depth dimension. The apparatus has a measurement light projecting optical system with a light source which is arranged to make a part of the light from the light source into first and second measurement light and collect the respective measurement light on first and second measurement surfaces of the eye, an interference optical system with a separation unit arranged to make the light into reference light and an optical path length changing unit which is arranged to synthesize the first and second measurement light respectively with the reference light to make them interfere with each other so as to photo-receive and obtain interference signals of the respective interference light, and a calculation part arranged to calculate the ocular depth dimension based on the interference signals and a driving result of the changing unit.Type: GrantFiled: May 29, 2007Date of Patent: May 13, 2008Assignee: Nidek Co., Ltd.Inventor: Masaaki Hanebuchi
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Publication number: 20080100802Abstract: An ophthalmic measurement apparatus which measures wavefront aberration of a patient's eye with high accuracy includes an irradiation optical system including a high-coherence measurement light source, a photo-receiving optical system including a light dividing element and a photodetector, a measurement light deflector placed in a position on an optical path of the irradiation optical system and not on that of the photo-receiving optical system, a memory storing deflection information and a pattern photo-received on the photodetector and associated with the information, and a control unit which drives the deflector to form patterns in different deflection states, controls the photodetector to photo-receive the patterns, reads out from the memory the information and the pattern, corrects the patterns based on their corresponding information by an amount of displacement of the read-out pattern with respect to a reference pattern, and performs addition to the corrected patterns so as to calculate the wavefront aType: ApplicationFiled: October 26, 2007Publication date: May 1, 2008Applicant: NIDEK CO., LTD.Inventor: Masaaki Hanebuchi
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Patent number: 7364298Abstract: An ophthalmic apparatus with which it is easy to open eyelids of an examinee at the time of intraocular pressure measurement has a measurement unit including an measurement part measuring intraocular pressure by blowing fluid to a cornea of an examinee's eye via a nozzle to deform the cornea and a measurement part having a measurement optical system for measuring eye characteristics of the eye, wherein the intraocular pressure measurement part is placed above the eye characteristic measurement part, a device making a selective changeover between an intraocular pressure measurement mode and an eye characteristic measurement mode, and a first movement mechanism part moving the measurement unit in an up-and-down direction with respect to the eye so that a measurement optical axis of either of the measurement parts to be used for the selected mode is positioned at approximately the same height as the examinee's eye.Type: GrantFiled: October 31, 2006Date of Patent: April 29, 2008Assignee: Nidek Co., Ltd.Inventors: Akihiro Hayashi, Masaaki Hanebuchi, Tetsuyuki Miwa, Mikio Kurachi
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Patent number: 7316480Abstract: An eye refractive power measurement apparatus which is capable of measuring even an eye with a small pupil diameter and measuring a normal eye with a large enough pupil diameter with accuracy and stability. The apparatus includes a measurement optical system for photo-receiving measurement light from a fundus via a ring-shaped aperture arranged at an approximately conjugate position with a pupil by using a photodetector, a changing device for changing a size of the ring-shaped aperture on a pupillary surface to a size different in both inside diameter and outside diameter, and a calculation device for calculating the eye refractive power based on a photo-receiving result obtained by the photodetector.Type: GrantFiled: September 27, 2004Date of Patent: January 8, 2008Assignee: Nidek Co., Ltd.Inventors: Masaaki Hanebuchi, Mitsuhiro Gono, Mikio Kurachi, Naoki Isogai
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Publication number: 20070279592Abstract: An ocular depth dimension measurement apparatus capable of accurately obtaining an ocular depth dimension. The apparatus has a measurement light projecting optical system with a light source which is arranged to make a part of the light from the light source into first and second measurement light and collect the respective measurement light on first and second measurement surfaces of the eye, an interference optical system with a separation unit arranged to make the light into reference light and an optical path length changing unit which is arranged to synthesize the first and second measurement light respectively with the reference light to make them interfere with each other so as to photo-receive and obtain interference signals of the respective interference light, and a calculation part arranged to calculate the ocular depth dimension based on the interference signals and a driving result of the changing unit.Type: ApplicationFiled: May 29, 2007Publication date: December 6, 2007Applicant: NIDEK CO., LTD.Inventor: Masaaki Hanebuchi
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Patent number: 7281798Abstract: An optometry apparatus comprising: a target projecting optical system adapted for diopter movement, for projecting a target onto a fundus of an examinee's eye to form an image of the target on the fundus, wherein the target projecting optical system including: an objective lens to be positioned at the front of the examinee's eye: a relay lens arranged so that a front focal point of the relay lens coincides with an approximate conjugate point of an anterior segment of the examinee's eye with respect to the objective lens positioned at the front of the examinee's eye; a plus-power lens arranged at the approximate conjugate point of the anterior segment with respect to the positioned objective lens, the plus-power lens having refractive power determined so that a front focal point of the plus-power lens coincides with an approximate conjugate point of the fundus with respect to the positioned objective lens; and an astigmatism correction optical element arranged between the relay lens and the plus-power lens, foType: GrantFiled: March 27, 2006Date of Patent: October 16, 2007Assignee: Nidek Co., Ltd.Inventor: Masaaki Hanebuchi
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Patent number: 7275825Abstract: An eye refractive power measurement apparatus capable of reducing an influence of scattered light and performing measurement with high accuracy. The apparatus has a measurement optical system including a system having a light source projecting spot-shaped measurement light onto a fundus of an examinee's eye, and a system having an optical axis, a photodetector, a ring-shaped aperture, a member by which the light reflected from the fundus via a peripheral pupillary portion and the aperture forms a ring-shaped image on the photodetector, and a diaphragm of a size such that a projection region by the diaphragm on the photodetector overlaps the axis within a predetermined amount and that the reflection light forms the image within the region in projecting the measurement light onto a myopic eye with the measurable highest diopter, and a part which obtains the eye refractive power based on an output from the photodetector.Type: GrantFiled: June 1, 2005Date of Patent: October 2, 2007Assignee: Nidek Co., Ltd.Inventor: Masaaki Hanebuchi
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Patent number: 7255440Abstract: The purpose of the present invention is to provide a corneal-ablation-data determining apparatus and a corneal-ablation-data determining program capable of controlling corneal ablation amount distribution and expanding ablation applicability. In the present invention, the corneal-ablation-data determining apparatus for use in keratorefractive surgery for ablating a corneal surface to correct a refractive error has input means for inputting measurement data on any one of wavefront aberration distribution and refractive power distribution of a patient's eye, decentering means for decentering a reference axis being a calculation reference for a corneal ablation amount, and calculation means for obtaining the corneal ablation amount based on the measurement data and data on eccentricity of the reference axis.Type: GrantFiled: June 3, 2002Date of Patent: August 14, 2007Assignee: Nidek Co., Ltd.Inventor: Masaaki Hanebuchi
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Publication number: 20070097317Abstract: An ophthalmic apparatus with which it is easy to open eyelids of an examinee at the time of intraocular pressure measurement has a measurement unit including an measurement part measuring intraocular pressure by blowing fluid to a cornea of an examinee's eye via a nozzle to deform the cornea and a measurement part having a measurement optical system for measuring eye characteristics of the eye, wherein the intraocular pressure measurement part is placed above the eye characteristic measurement part, a device making a selective changeover between an intraocular pressure measurement mode and an eye characteristic measurement mode, and a first movement mechanism part moving the measurement unit in an up-and-down direction with respect to the eye so that a measurement optical axis of either of the measurement parts to be used for the selected mode is positioned at approximately the same height as the examinee's eye.Type: ApplicationFiled: October 31, 2006Publication date: May 3, 2007Applicant: NIDEK CO., LTD.Inventors: Akihiro Hayashi, Masaaki Hanebuchi, Tetsuyuki Miwa, Mikio Kurachi
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Publication number: 20070002277Abstract: An ophthalmic apparatus capable of obtaining various kinds of ocular information on an examinee's eye by itself without contacting the eye. The ophthalmic apparatus has a first projection optical system which makes first light with short coherence length converge at a fundus of the eye, a second projection optical system which makes second light with short coherence length converge at an anterior segment of the eye, a photo-receiving optical system which synthesizes the first light reflected from the fundus and the second light reflected from the anterior segment into interference light, disperses the interference light into frequency components and photo-receives the dispersed light with a first photodetector, and a calculation part which obtains depth information of the eye as ocular information based on a result obtained by analyzing an output signal from the first photodetector by means of Fourier transform.Type: ApplicationFiled: June 30, 2006Publication date: January 4, 2007Applicant: NIDEK CO., LTD.Inventor: Masaaki Hanebuchi
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Publication number: 20060221301Abstract: An optometry apparatus comprising: a target projecting optical system adapted for diopter movement, for projecting a target onto a fundus of an examinee's eye to form an image of the target on the fundus, wherein the target projecting optical system including: an objective lens to be positioned at the front of the examinee's eye: a relay lens arranged so that a front focal point of the relay lens coincides with an approximate conjugate point of an anterior segment of the examinee's eye with respect to the objective lens positioned at the front of the examinee's eye; a plus-power lens arranged at the approximate conjugate point of the anterior segment with respect to the positioned objective lens, the plus-power lens having refractive power determined so that a front focal point of the plus-power lens coincides with an approximate conjugate point of the fundus with respect to the positioned objective lens; and an astigmatism correction optical element arranged between the relay lent and the plus-power lens, foType: ApplicationFiled: March 27, 2006Publication date: October 5, 2006Applicant: NIDEK CO., LTDInventor: Masaaki Hanebuchi
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Publication number: 20060087616Abstract: A method and an apparatus using optical coherence tomography based on spectral interference where depth information of an object can be speedily obtained and an information acquisition range in a depth direction can be enlarged by removing noise, and to provide an ophthalmic apparatus.Type: ApplicationFiled: September 30, 2005Publication date: April 27, 2006Applicant: NIDEK CO., LTD.Inventor: Masaaki Hanebuchi
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Publication number: 20060066869Abstract: An optical coherence tomography apparatus based on spectral interference where object information can be speedily obtained and an information acquisition range in a depth direction can be enlarged, and an ophthalmic apparatus.Type: ApplicationFiled: September 28, 2005Publication date: March 30, 2006Applicant: Nidek Co., Ltd.Inventors: Tokio Ueno, Masaaki Hanebuchi
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Publication number: 20050270488Abstract: An eye refractive power measurement apparatus capable of reducing an influence of scattered light and performing measurement with high accuracy. The apparatus has a measurement optical system including a system having a light source projecting spot-shaped measurement light onto a fundus of an examinee's eye, and a system having an optical axis, a photodetector, a ring-shaped aperture, a member by which the light reflected from the fundus via a peripheral pupillary portion and the aperture forms a ring-shaped image on the photodetector, and a diaphragm of a size such that a projection region by the diaphragm on the photodetector overlaps the axis within a predetermined amount and that the reflection light forms the image within the region in projecting the measurement light onto a myopic eye with the measurable highest diopter, and a part which obtains the eye refractive power based on an output from the photodetector.Type: ApplicationFiled: June 1, 2005Publication date: December 8, 2005Applicant: NIDEK CO., LTD.Inventor: Masaaki Hanebuchi
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Publication number: 20050157261Abstract: An eye refractive power measurement apparatus capable of measuring even an eye with a small pupil diameter with accuracy and stability. The apparatus has a measurement optical system including a projection optical system, having a light source, for projecting spot-shaped measurement light onto a fundus and a photo-receiving optical system, having a photodetector, for photo-receiving the measurement light reflected from the fundus via a peripheral pupillary portion, a calculation part which obtains the eye reflective power based on an output from the photodetector, alight deflection member, an arrangement of which in the measurement optical system being prevented from having a positional relationship optically approximately conjugate with a pupil, and a rotation unit which rotates the light deflection member about a measurement optical axis of the measurement optical system.Type: ApplicationFiled: December 17, 2004Publication date: July 21, 2005Applicant: NIDEK CO., LTD.Inventors: Masaaki Hanebuchi, Mitsuhiro Gono
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Publication number: 20050068497Abstract: An eye refractive power measurement apparatus which is capable of measuring even an eye with a small pupil diameter and measuring a normal eye with a large enough pupil diameter with accuracy and stability. The apparatus includes a measurement optical system for photo-receiving measurement light from a fundus via a ring-shaped aperture arranged at an approximately conjugate position with a pupil by using a photodetector, a changing device for changing a size of the ring-shaped aperture on a pupillary surface to a size different in both inside diameter and outside diameter, and a calculation device for calculating the eye refractive power based on a photo-receiving result obtained by the photodetector.Type: ApplicationFiled: September 27, 2004Publication date: March 31, 2005Applicant: NIDEK CO., LTD.Inventors: Masaaki Hanebuchi, Mitsuhiro Gono, Mikio Kurachi, Naoki Isogai
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Publication number: 20040135969Abstract: The purpose of the present invention is to provide a corneal-ablation-data determining apparatus and a corneal-ablation-data determining program capable of controlling corneal ablation amount distribution and expanding ablation applicability. In the present invention, the corneal-ablation-data determining apparatus for use in keratorefractive surgery for ablating a corneal surface to correct a refractive error has input means for inputting measurement data on any one of wavefront aberration distribution and refractive power distribution of a patient's eye, decentering means for decentering a reference axis being a calculation reference for a corneal ablation amount, and calculation means for obtaining the corneal ablation amount based on the measurement data and data on eccentricity of the reference axis.Type: ApplicationFiled: October 30, 2003Publication date: July 15, 2004Inventor: Masaaki Hanebuchi