Patents by Inventor Tomohiko Ishibashi
Tomohiko Ishibashi 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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Publication number: 20230171480Abstract: An image processing apparatus includes at least one processor, and a memory coupled to the at least one processor, the memory storing instructions that, when executed by the processor, perform operations as a first acquiring unit, a second acquiring unit, a setting unit, and a third acquiring unit. The first acquiring unit is configured to acquire a first image generated by imaging an object via a polarizing element configured to transmit lights having a plurality of polarization azimuths different from each other. The second acquiring unit is configured to acquire information on an imaging condition in the imaging. The setting unit is configured to set information on a polarization azimuth in the first image according to the information on the imaging condition. The third acquiring unit is configured to acquire polarization information from the first image using the information on the polarization azimuth.Type: ApplicationFiled: November 28, 2022Publication date: June 1, 2023Inventors: Rie Ishimatsu, Tomohiko Ishibashi
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Patent number: 11435507Abstract: An optical element having an area in which a transmittance changes in a first direction, the optical element includes a substrate and a first layer in a second direction orthogonal to the first direction. A thickness of the first layer in the second direction changes in the first direction, and the extinction coefficient of the first layer changes in the first direction. A predetermined conditional expression is satisfied.Type: GrantFiled: January 31, 2020Date of Patent: September 6, 2022Assignee: CANON KABUSHIKI KAISHAInventors: Tomohiko Ishibashi, Kazue Uchida
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Publication number: 20210311236Abstract: The disclosed optical filter is provided on a substrate. The optical filter includes a first layer, an absorption layer, and a second layer in order from a substrate side. The condition of |R1?R2|?10 is satisfied where R1 [%] represents a reflectance of the optical filter for light whose wavelength is 550 nm and that makes incident on the optical filter from a side opposite to the substrate, and R2 [%] represents a reflectance of the optical filter for light whose wavelength is 550 nm and that makes incident on the optical filter from the substrate side.Type: ApplicationFiled: March 19, 2021Publication date: October 7, 2021Inventors: Kazue UCHIDA, Tomohiko ISHIBASHI
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Publication number: 20210124182Abstract: An optical system includes an aperture stop, a first optical element disposed on one of an object side and an image side of the aperture stop, and a second optical element disposed on the other of the object side and the image side. Each of the first optical element and the second optical element includes an area in which a transmittance changes in a direction perpendicular to an optical axis. The following conditional expressions are satisfied: 0.60?|m1/a1|<|m2/a2|?1.40, 0.40?T1(h1)/T2(h2)<0.98, and 0.30?2×h1/?1?0.70.Type: ApplicationFiled: October 16, 2020Publication date: April 29, 2021Inventor: Tomohiko Ishibashi
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Publication number: 20200257026Abstract: An optical element having an area in which a transmittance changes in a first direction, the optical element includes a substrate and a first layer in a second direction orthogonal to the first direction. A thickness of the first layer in the second direction changes in the first direction, and the extinction coefficient of the first layer changes in the first direction. A predetermined conditional expression is satisfied.Type: ApplicationFiled: January 31, 2020Publication date: August 13, 2020Inventors: Tomohiko Ishibashi, Kazue Uchida
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Patent number: 10712524Abstract: An optical system of the present invention includes a plurality of lenses inclusive of an aspheric lens having an aspheric surface. A light absorption portion having thickness distribution in a direction perpendicular to an optical axis of the optical system is provided on the optical axis. Here, a refractive index of the aspheric lens, a refractive index of the light absorption portion, an aspheric sag amount of the aspheric lens, an aspheric sag amount of the light absorption portion, a height of a position in the aspheric lens through which a marginal ray of an axial ray passes, and a height of a position in the light absorption portion through which the marginal ray of the axial ray passes are each appropriately set.Type: GrantFiled: August 28, 2018Date of Patent: July 14, 2020Assignee: CANON KABUSHIKI KAISHAInventor: Tomohiko Ishibashi
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Patent number: 10401544Abstract: An optical system includes an optical element made of resin and a reflection portion configured to reflect ultraviolet radiation. The reflection portion is provided on an optical surface located closer to an object side than the optical element, and conditional expressions 0.10?Lu/L?0.90 and |tan?1(H0/Lr)?tan?1{H0(Lr?Lu)/(Ru×Lr)}|?25° are satisfied, in which H0 represents a maximum height, from an optical axis, of an optical surface closest to the object side, Lu represents a distance from the optical surface closest to the object side to the reflection portion, Lr represents a distance from the optical surface closest to the object side to the optical element, L represents a total length of the optical system, and Ru represents a radius of curvature of the optical surface on which the reflection portion is provided.Type: GrantFiled: July 13, 2016Date of Patent: September 3, 2019Assignee: CANON KABUSHIKI KAISHAInventor: Tomohiko Ishibashi
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Patent number: 10365453Abstract: An optical device including first and second optical elements formed of mutually different materials, and a bonding member bonding the first and second optical elements to each other, wherein the following conditional expression is satisfied: 0.14<Log(te/tc)×Log(E1×E2/Ec2)<5.0 where tc is a thickness in an optical axis direction of the bonding member on an optical axis, te is a thickness in the optical axis direction of the bonding member in a maximum diameter of interfaces between the first and second optical elements and the bonding member, and E1, E2, and Ec are respective Young's moduli of the first and second optical elements and the bonding member.Type: GrantFiled: June 29, 2017Date of Patent: July 30, 2019Assignee: Canon Kabushiki KaishaInventor: Tomohiko Ishibashi
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Patent number: 10281735Abstract: An optical system includes an aperture diaphragm, a first optical element disposed on a light incident side of the aperture diaphragm, and a second optical element disposed on a light emission side of the aperture diaphragm. Transmittance distribution of the first optical element satisfies a predetermined conditional expression. Transmittance distribution of the second optical element satisfies a predetermined conditional expression.Type: GrantFiled: August 28, 2017Date of Patent: May 7, 2019Assignee: Canon Kabushiki KaishaInventor: Tomohiko Ishibashi
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Publication number: 20190064472Abstract: An optical system of the present invention includes a plurality of lenses inclusive of an aspheric lens having an aspheric surface. A light absorption portion having thickness distribution in a direction perpendicular to an optical axis of the optical system is provided on the optical axis. Here, a refractive index of the aspheric lens, a refractive index of the light absorption portion, an aspheric sag amount of the aspheric lens, an aspheric sag amount of the light absorption portion, a height of a position in the aspheric lens through which a marginal ray of an axial ray passes, and a height of a position in the light absorption portion through which the marginal ray of the axial ray passes are each appropriately set.Type: ApplicationFiled: August 28, 2018Publication date: February 28, 2019Inventor: Tomohiko Ishibashi
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Patent number: 10067322Abstract: Provided is an optical system including, in order from an object side to an image side, a first lens unit and a second lens unit with a positive refractive power. One of lenses of the first lens unit is the closest to the object side and has a negative refractive power. The second lens unit includes an aperture diaphragm. One of lenses that is included in the second lens unit, located on the object side or the image side of the aperture diaphragm and the closest to the aperture diaphragm has a concave lens surface that faces the aperture diaphragm. Conditions are satisfied whose values are set by using refractive indexes of a negative lens and a positive lens of the first lens unit that respectively have the smallest Abbe number.Type: GrantFiled: November 13, 2015Date of Patent: September 4, 2018Assignee: Canon Kabushiki KaishaInventor: Tomohiko Ishibashi
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Publication number: 20180067333Abstract: An optical system includes an aperture diaphragm, a first optical element disposed on a light incident side of the aperture diaphragm, and a second optical element disposed on a light emission side of the aperture diaphragm. Transmittance distribution of the first optical element satisfies a predetermined conditional expression. Transmittance distribution of the second optical element satisfies a predetermined conditional expression.Type: ApplicationFiled: August 28, 2017Publication date: March 8, 2018Inventor: Tomohiko Ishibashi
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Publication number: 20180003904Abstract: An optical device including first and second optical elements formed of mutually different materials, and a bonding member bonding the first and second optical elements to each other, wherein the following conditional expression is satisfied: 0.14<Log(te/tc)×Log(E1×E2/Ec2)<5.0 where tc is a thickness in an optical axis direction of the bonding member on an optical axis, te is a thickness in the optical axis direction of the bonding member in a maximum diameter of interfaces between the first and second optical elements and the bonding member, and E1, E2, and Ec are respective Young's moduli of the first and second optical elements and the bonding member.Type: ApplicationFiled: June 29, 2017Publication date: January 4, 2018Inventor: Tomohiko Ishibashi
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Publication number: 20170031071Abstract: An optical system includes an optical element made of resin and a reflection portion configured to reflect ultraviolet radiation. The reflection portion is provided on an optical surface located closer to an object side than the optical element, and conditional expressions 0.10?Lu/L?0.90 and |tan?1(H0/Lr)?tan?1{H0(Lr?Lu)/(Ru×Lr)}|?25° are satisfied, in which H0 represents a maximum height, from an optical axis, of an optical surface closest to the object side, Lu represents a distance from the optical surface closest to the object side to the reflection portion, Lr represents a distance from the optical surface closest to the object side to the optical element, L represents a total length of the optical system, and Ru represents a radius of curvature of the optical surface on which the reflection portion is provided.Type: ApplicationFiled: July 13, 2016Publication date: February 2, 2017Inventor: Tomohiko Ishibashi
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Publication number: 20160291289Abstract: An optical element includes a first optical component, a second optical component cemented to the first optical component, and a third optical component cemented to the second optical component. At least either one of the first and third optical components and the second optical component are cemented to each other via a cement member. Following conditional expressions are satisfied: ?0.5<Log(E1×E3/E22)<10, and ?0.2<Log(E2/Ec)<10, where Young's moduli of the first to third optical components and the cement member are respectively denoted by E1, E2, E3, and Ec.Type: ApplicationFiled: March 15, 2016Publication date: October 6, 2016Inventors: Tomohiko Ishibashi, Hironobu Koga
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Publication number: 20160139385Abstract: Provided is an optical system including, in order from an object side to an image side, a first lens unit and a second lens unit with a positive refractive power. One of lenses of the first lens unit is the closest to the object side and has a negative refractive power. The second lens unit includes an aperture diaphragm. One of lenses that is included in the second lens unit, located on the object side or the image side of the aperture diaphragm and the closest to the aperture diaphragm has a concave lens surface that faces the aperture diaphragm. Conditions are satisfied whose values are set by using refractive indexes of a negative lens and a positive lens of the first lens unit that respectively have the smallest Abbe number.Type: ApplicationFiled: November 13, 2015Publication date: May 19, 2016Inventor: Tomohiko Ishibashi
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Patent number: 9134515Abstract: The optical system includes first (positive) and second (negative) lens units arranged in order from an object side to an image side, and an aperture stop disposed further on the image side than the second lens unit. The first lens unit includes at least one first optical element satisfying ?GH>0.0, ?dGH<39.5 and ndGH>1.70. The optical system satisfies 0.65<|?2/?1|<6.00 and 0.45<|??GH×?2/?12|<4.00. ?GH represents a refractive power of the first optical element when light-entrance and light-exit surfaces thereof are in contact with air, ?dGH and ndGH respectively represent an Abbe number and a refractive index of a material forming the first optical element for a d-line, ?1 and ?2 respectively represent the refractive powers of the first lens unit and the second lens unit, and ??GH represents a sum total of the refractive power ?GH of the at least one first optical element.Type: GrantFiled: February 16, 2011Date of Patent: September 15, 2015Assignee: CANON KABUSHIKI KAISHAInventor: Tomohiko Ishibashi
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Publication number: 20140028839Abstract: The image processing method includes acquiring an input image produced by image capturing through an image capturing optical system tilted with respect to an image pickup plane, acquiring tilt information showing a condition of the tilt of the image capturing optical system in the image capturing, and performing an image process on the input image, by using information on aberration of the image capturing optical system corresponding to the tilt information, to correct image degradation caused by the aberration. The tilt information shows a tilt direction and a tilt angle of the image capturing optical system with respect to the image pickup plane. The method acquires object distances for respective image heights in the image pickup plane by using the tilt direction and the tilt angle and performs the image process corresponding to the object distance for each image height.Type: ApplicationFiled: July 24, 2013Publication date: January 30, 2014Applicant: CANON KABUSHIKI KAISHAInventor: Tomohiko ISHIBASHI
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Patent number: 8279540Abstract: A compound lens comprises three or more optical elements, including first, second, and third optical components, that are cemented together. The material of the second optical element is an organic composite material. The first optical element is cemented to one surface of the second optical element. The third optical element is disposed remotest from the first optical element in an optical axis. The diameters of effective areas of the first optical element on the cemented surface between the first and the second optical elements, and of the second optical element, and the distance ti(?) between optically effective surfaces of the i-th optical element (i=1, 2, 3) along the optical axis at diameter ? are appropriately designed. The second optical element has such a shape that the decrease in the distance between its optically effective surfaces is small in a region outside the effective surface area.Type: GrantFiled: October 29, 2010Date of Patent: October 2, 2012Assignee: Canon Kabushiki KaishaInventors: Tomohiko Ishibashi, Satoshi Maetaki
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Patent number: 8189265Abstract: An optical element Ggi1 includes a medium that has a refractive index distribution. This optical element satisfies conditions of |?gF(pmax)??gF(pmin)|?0.02, |??gFgi(p1)|?0.0272,|??gdgi(p1)|?0.0250, and |?gFgi(pmaxgi)??gFgi(pmingi)|?0.1.Type: GrantFiled: September 23, 2010Date of Patent: May 29, 2012Assignee: Canon Kabushiki KaishaInventor: Tomohiko Ishibashi