Patents by Inventor Keisuke Takada
Keisuke Takada 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: 20180231746Abstract: An image pickup apparatus includes an optical system which includes a plurality of lenses, and an image sensor which is disposed at an image position of the optical system, wherein the optical system includes in order from an object side, a first lens having a negative refractive power, an aperture stop, a second lens having a positive refractive power, and a third lens, and an object-side surface of the third lens has a shape which his concave toward the object side, and each of the first lens, the second lens, and the third lens is formed of a material having a refractive index not higher than 1.70, and the following conditional expression (1) is satisfied: 0.5<?L/IH<3.0??(1), where, IH denotes a maximum image height, and ?1L denotes an effective aperture at an object-side surface of the first lens.Type: ApplicationFiled: April 16, 2018Publication date: August 16, 2018Applicant: OLYMPUS CORPORATIONInventors: Yoshihiro UCHIDA, Keisuke TAKADA
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Publication number: 20180224637Abstract: An image pickup apparatus includes an optical system which includes a plurality of lenses, and an image sensor which is disposed at an image position of the optical system, wherein the optical system includes in order from an object side, a first lens having a negative refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, and a fourth lens, and the following conditional expressions (1) and (2) are satisfied: ? max?? min<4.0×10?5/° C.??(1), and 0.1<R1R/FL<2.5??(2).Type: ApplicationFiled: April 5, 2018Publication date: August 9, 2018Applicant: OLYMPUS CORPORATIONInventors: Yoshihiro UCHIDA, Keisuke TAKADA
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Publication number: 20180224635Abstract: An image pickup apparatus includes an optical system which includes a plurality of lenses, and an image sensor which is disposed at an image position of the optical system, wherein the optical system has a lens surface positioned nearest to object and a lens surface positioned nearest to image, and includes in order from the object side, a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a positive refractive power, and a fourth lens, and an object-side surface of the second lens has a shape which is convex toward the object side, and the following conditional expressions (1) and (2) are satisfied: ?max??min<4.0×10?5/° C.??(1), and 1.8<?d/FL<6.5??(2).Type: ApplicationFiled: April 3, 2018Publication date: August 9, 2018Applicant: OLYMPUS CORPORATIONInventors: Keisuke TAKADA, Yoshihiro UCHIDA
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Publication number: 20180224638Abstract: An image pickup apparatus includes an optical system which includes a plurality of lenses, and an image sensor which is disposed at an image position of the optical system, wherein the optical system includes in order from an object side, a first lens having a negative refractive power, an aperture stop, a second lens having a positive refractive power, and a third lens having a positive refractive power, and each of the first lens, the second lens, and the third lens is formed of a material having a refractive index not higher than 1.70, and the following conditional expressions (1), (2), (3), and (4) are satisfied: 0<f3/f2?1.7??(1), 0.5<?1n/IH<3.0??(2), 0.05<D1R2L/?d<0.5??(3), and ?0.4<f1/R1L<0.2??(4).Type: ApplicationFiled: April 5, 2018Publication date: August 9, 2018Applicant: OLYMPUS CORPORATIONInventors: Yoshihiro UCHIDA, Keisuke TAKADA
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Publication number: 20180224636Abstract: An image pickup apparatus includes an optical system which includes a plurality of lenses and an aperture stop, and an image sensor which is disposed at an image position of the optical system, wherein the optical system includes in order from an object side, a first lens having a negative refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, and a fourth lens, and the following conditional expressions (1) and (3) are satisfied: ?max??min<4.0×10?5/° C.??(1), and 0.2<D1Ls/DsF<3.0??(3).Type: ApplicationFiled: April 5, 2018Publication date: August 9, 2018Applicant: OLYMPUS CORPORATIONInventors: Yoshihiro Uchida, Keisuke Takada
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Publication number: 20180224639Abstract: An image pickup apparatus includes an optical system which includes a plurality of lenses, and an image sensor which is disposed at an image position of the optical system, wherein the optical system has a lens surface positioned nearest to object and a lens surface positioned nearest to image, and includes in order from the object side, a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a positive refractive power, and a fourth lens, and an object-side surface of the second lens has a shape which is convex toward the object side, and the following conditional expressions (1), (2), and (A) are satisfied: ?max??min<4.0×10?5/° C.??(1), 1.8<?d/FL<6.5??(2), and 1<f2/FL<15.2??(A).Type: ApplicationFiled: April 3, 2018Publication date: August 9, 2018Applicant: OLYMPUS CORPORATIONInventors: Keisuke TAKADA, Yoshihiro UCHIDA
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Publication number: 20180095247Abstract: An image pickup apparatus includes an image forming optical system which includes an aperture stop and a plurality of lens components, and an image pickup section which has a light-receiving surface which is not flat but is curved to be concave toward the image forming optical system. The image forming optical system includes a first lens component having a negative refractive power, a second lens component having a positive refractive power, and a third lens component having a positive refractive power. In the first lens component, a lens surface on the object side is convex toward the object side, and in a lens surface on the object side of the second lens component, a part of an area is concave toward the object side. Moreover, the following conditional expression (1) is satisfied: 0.5<(R1L+R1R)/(R1L?R1R)<2.5 ??(1).Type: ApplicationFiled: September 28, 2017Publication date: April 5, 2018Applicant: OLYMPUS CORPORATIONInventors: Takahiro AMANAI, Keisuke TAKADA, Kyoko IIJIMA
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Patent number: 9902851Abstract: A resin composition containing a cyclic epoxy-modified silicone compound (A) represented by formula (1), a cyanic acid ester compound (B) and/or a phenol resin (C) and an inorganic filler (D): wherein Ra each independently represent an organic group having an epoxy group; Rb each independently represent a substituted or unsubstituted monovalent hydrocarbon group; x represents an integer of 0 to 2; and y represents an integer of 1 to 6; and the siloxane unit marked with x and the siloxane unit marked with y are arranged mutually at random.Type: GrantFiled: October 18, 2013Date of Patent: February 27, 2018Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Hiroshi Takahashi, Tomo Chiba, Nobuyoshi Ohnishi, Katsuya Tomizawa, Keisuke Takada, Eisuke Shiga, Takaaki Ogashiwa
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Publication number: 20170363846Abstract: A zoom image pickup apparatus includes a mount portion, a zoom lens which forms an image of light incident from the mount portion, and an image pickup element which is disposed at an image forming position, wherein the zoom lens includes in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power, and the fourth lens unit is a focusing lens unit, and at the time of zooming from a wide angle end to a telephoto end, only the second lens unit and the fourth lens unit move, and the following conditional expression (1) is satisfied: ?L1<?3GL1??(1).Type: ApplicationFiled: August 10, 2017Publication date: December 21, 2017Applicant: OLYMPUS CORPORATIONInventor: Keisuke TAKADA
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Publication number: 20170336593Abstract: A zoom image pickup apparatus includes a mount portion, a zoom lens which forms an image of light incident from the mount portion, and an image pickup element which is disposed at an image forming position. The zoom lens includes in order from an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a lens unit having a negative refractive power. The second lens unit is a focusing lens unit. At the time of zooming from a wide angle end to a telephoto end, the third lens unit and the lens unit having a negative refractive power positioned on an object side of the third lens unit move, and the following conditional expression (1) is satisfied: ?L1<?3GL1 ??(1).Type: ApplicationFiled: August 10, 2017Publication date: November 23, 2017Applicant: OLYMPUS CORPORATIONInventor: Keisuke TAKADA
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Publication number: 20170336594Abstract: A zoom image pickup apparatus includes a mount portion, a zoom lens which forms an image of light incident from the mount portion, and an image pickup element which is disposed at an image forming position. The zoom lens includes a plurality of lens unit, and a focusing lens unit, and the following conditional expressions (1) and (2) are satisfied: 1.5<fLt/fLw ??(1), and |(yw7d??yw7d)/yw7d×100<0.66 ??(2).Type: ApplicationFiled: August 10, 2017Publication date: November 23, 2017Applicant: OLYMPUS CORPORATIONInventor: Keisuke TAKADA
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Patent number: 9823452Abstract: A zoom lens comprising in order from an object side, a first lens unit having a negative refractive power, a second lens unit having a negative refractive power, a lens unit having a positive refractive power, and a rearmost lens unit having a negative refractive power, and the rearmost lens unit is positioned nearest to an image in the plurality of lens units, and at the time of zooming, distances between the lens units in the plurality of lens units change. Moreover, an image pickup apparatus includes the zoom lens, and an image pickup element having an image pickup surface.Type: GrantFiled: October 9, 2015Date of Patent: November 21, 2017Assignee: OLYMPUS CORPORATIONInventors: Takashi Fujikura, Keisuke Takada
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Patent number: 9739997Abstract: An objective lens including a first lens group immovable in changing magnification from a normal observation state to a close-up observation state, a second lens group arranged nearer to the image side than the first lens group and moving along the optical axis in the change of magnification, a third lens group arranged nearer to the image side than the second lens group and immovable in the change of magnification, and an aperture stop arranged between the second lens group and an image plane and immovable in the change of magnification, and the objective lens satisfying the following condition: 1.24<|F1f/Fn|<1.8 where F1f denotes the focal length of a lens that is placed nearest to the object side in the first lens group and Fn denotes the focal length of the whole system in the normal observation state.Type: GrantFiled: June 8, 2015Date of Patent: August 22, 2017Assignee: OLYMPUS CORPORATIONInventor: Keisuke Takada
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Patent number: 9588324Abstract: A zoom lens having a plurality of lens units comprises in order from an object side, a first lens unit G1 having a positive refractive power, a second lens unit G2 having a negative refractive power, and a rearmost lens unit having a negative refractive power, and the rearmost lens unit is positioned nearest to an image in the plurality of lens units, and at the time of zooming from a wide angle end to a telephoto end, distances between the lens units change, and the first lens unit G1 moves toward the object side, and following conditional expression (1) is satisfied: 0.2<(?lt/?lw)/(ft/fw)<0.7??(1).Type: GrantFiled: October 30, 2015Date of Patent: March 7, 2017Assignee: Olympus CorporationInventors: Keisuke Takada, Takashi Fujikura
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Patent number: 9557542Abstract: A zoom lens includes in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a negative refractive power, and the fourth lens unit includes at least two lenses. At the time of zooming from a wide angle end to a telephoto end, a distance between the first lens unit and the second lens unit widens, a distance between the second lens unit and the third lens unit narrows, a distance between the third lens unit and the fourth lens unit fluctuates, and the first lens unit, after moving toward the image side, moves toward the object side.Type: GrantFiled: April 13, 2015Date of Patent: January 31, 2017Assignee: Olympus CorporationInventor: Keisuke Takada
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Publication number: 20160147050Abstract: A zoom lens includes in order from an object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a negative refractive power, and at the time of zooming, movement of the first lens unit includes at least a movement toward an image side, the second lens unit moves integrally with an aperture stop, and the third lens unit moves toward the object side, and the first lens unit includes at least a negative lens and a positive lens, and the negative lens is disposed nearest to an object, and the following conditional expressions are satisfied: 0.75<(?2t/?2w)/(?3t/?3w)<1.38 ?0.70<?2w<?0.32 0.96<f2/fw<1.80.Type: ApplicationFiled: January 28, 2016Publication date: May 26, 2016Inventors: Takashi Fujikura, Keisuke Takada, Keisuke Ichikawa
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Publication number: 20160048007Abstract: A zoom lens having a plurality of lens units comprises in order from an object side, a first lens unit G1 having a positive refractive power, a second lens unit G2 having a negative refractive power, and a rearmost lens unit having a negative refractive power, and the rearmost lens unit is positioned nearest to an image in the plurality of lens units, and at the time of zooming from a wide angle end to a telephoto end, distances between the lens units change, and the first lens unit G1 moves toward the object side, and following conditional expression (1) is satisfied: 0.2<(?lt/?lw)/(ft/fw)<0.7??(1).Type: ApplicationFiled: October 30, 2015Publication date: February 18, 2016Inventors: Keisuke Takada, Takashi Fujikura
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Publication number: 20160033749Abstract: A zoom lens comprising in order from an object side, a first lens unit having a negative refractive power, a second lens unit having a negative refractive power, a lens unit having a positive refractive power, and a rearmost lens unit having a negative refractive power, and the rearmost lens unit is positioned nearest to an image in the plurality of lens units, and at the time of zooming, distances between the lens units in the plurality of lens units change. Moreover, an image pickup apparatus includes the zoom lens, and an image pickup element having an image pickup surface.Type: ApplicationFiled: October 9, 2015Publication date: February 4, 2016Inventors: Takashi Fujikura, Keisuke Takada
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Publication number: 20150267047Abstract: A resin composition containing a cyclic epoxy-modified silicone compound (A) represented by formula (1), a cyanic acid ester compound (B) and/or a phenol resin (C) and an inorganic filler (D): wherein Ra each independently represent an organic group having an epoxy group; Rb each independently represent a substituted or unsubstituted monovalent hydrocarbon group; x represents an integer of 0 to 2; and y represents an integer of 1 to 6; and the siloxane unit marked with x and the siloxane unit marked with y are arranged mutually at random.Type: ApplicationFiled: October 18, 2013Publication date: September 24, 2015Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Hiroshi Takahashi, Tomo Chiba, Nobuyoshi Ohnishi, Katsuya Tomizawa, Keisuke Takada, Eisuke Shiga, Takaaki Ogashiwa
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Publication number: 20150268460Abstract: An objective lens including a first lens group immovable in changing magnification from a normal observation state to a close-up observation state, a second lens group arranged nearer to the image side than the first lens group and moving along the optical axis in the change of magnification, a third lens group arranged nearer to the image side than the second lens group and immovable in the change of magnification, and an aperture stop arranged between the second lens group and an image plane and immovable in the change of magnification, and the objective lens satisfying the following condition: 1.24<|F1f/Fn|<1.8 where F1f denotes the focal length of a lens that is placed nearest to the object side in the first lens group and Fn denotes the focal length of the whole system in the normal observation state.Type: ApplicationFiled: June 8, 2015Publication date: September 24, 2015Inventor: Keisuke Takada