Patents by Inventor Naotoshi Ogawa
Naotoshi Ogawa 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: 20240027740Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having positive refractive power, the first lens unit being configured not to move for zooming, an intermediate group including a plurality of lens units, the plurality of lens units being configured to move for zooming, and a rear lens unit. An interval between adjacent lens units changes for zooming. The intermediate group includes a lens unit having negative refractive power including a negative lens LN that satisfies the following inequalities: 1.60<ndLN<2.00 25.0<vdLN<60.0 0.490<?CtLN?0.00417×vdLN<0.550 where ndLN is a refractive index of a material of the negative lens LN for d-line, vdLN is Abbe number of the material for d-line, and OCtLN is a partial dispersion ratio of the material for C-line and t-line.Type: ApplicationFiled: July 14, 2023Publication date: January 25, 2024Inventor: NAOTOSHI OGAWA
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Patent number: 11347034Abstract: A zoom lens includes, from the object side, a positive first lens unit not moving for zooming, a negative second lens unit moving for zooming, and a positive third lens unit moving for zooming. The second lens unit includes a negative lens closest to the object side, the third lens unit consists of a 3-1 sub-lens unit and a 3-2 sub-lens unit from the object side. Conditional expressions ?18.0<f1/f2<?3.0, 0.2<f21/f2<3.6, ?0.95<f21/r2<?0.25, 7.0<?2t/?2w<125.0, and 0.3<f31/f32<2.5, are satisfied where f1, f2, and f21 are the focal lengths of the first lens unit, the second lens unit, and the negative lens, r2 is an image-side radius of curvature of the negative lens, ?2w and ?2t are the lateral magnifications of the second lens unit at the wide angle end and the telephoto end, and f31 and f32 are the focal lengths of the 3-1 sub-lens unit and the 3-2 sub-lens unit.Type: GrantFiled: February 19, 2019Date of Patent: May 31, 2022Assignee: CANON KABUSHIKI KAISHAInventors: Masao Hori, Kazuya Shimomura, Naotoshi Ogawa
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Publication number: 20210405336Abstract: A zoom lens includes, from an object side a first lens unit (a positive refractive power) configured not to move for zooming, two or more intermediate lens units configured to move in zooming, and a rear lens unit (a positive refractive power), wherein an interval between each pair of adjacent lens units changes in zooming, the first lens unit includes, from the object side, a first lens subunit (a negative refractive power) configured not to move for focusing, a second lens subunit (a positive refractive power) configured to move for focusing, and a third lens subunit (a positive refractive power), the zoom lens satisfies specific inequalities concerning a focal length of the first lens unit, a length on an optical axis from a last surface to a rear principal point of the first lens unit, and a focal length of the zoom lens at a telephoto end.Type: ApplicationFiled: June 23, 2021Publication date: December 30, 2021Inventors: Tomoya Yamada, Masaru Sakamoto, Yu Inomoto, Naotoshi Ogawa
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Publication number: 20210405335Abstract: A zoom lens includes, in order from an object side, a positive first lens unit configured not to move for zooming, two or more intermediate lens units configured to move for zooming, and a positive rear lens unit. A distance between each pair of adjacent lens units changes for zooming. The first lens unit includes, in order from the object side, a negative first sub lens unit configured not to move for focusing, a positive second sub lens unit configured to move for focusing, and a positive third sub lens unit. Specific conditional expressions are satisfied with respect to a focal length and a thickness of the first lens unit, focal lengths of the zoom lens at a wide angle end and a telephoto end, a backfocus, and a focal length of the first sub lens unit.Type: ApplicationFiled: June 18, 2021Publication date: December 30, 2021Inventors: Naotoshi Ogawa, Tomoya Yamada, Masaru Sakamoto, Yu Inomoto
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Patent number: 11187876Abstract: Provided is a zoom lens including in order from an object side: a positive first lens unit not moving for a change in magnification; a negative second lens unit moving for a change in magnification; and two or three rear lens units having a positive refractive power as a whole, at least one of the rear lens units being configured to move for a change in magnification. The first lens unit includes a negative first lens sub-unit not moving for focusing, a positive second lens sub-unit moving for focusing, a third lens sub-unit not moving for focusing, and a positive fourth lens sub-unit moving for focusing. An amount of movement of the second lens sub-unit during focusing from infinity to a minimum object distance, and an amount of movement of the fourth lens sub-unit during focusing from infinity to the minimum object distance satisfy a specific conditional expression.Type: GrantFiled: July 24, 2020Date of Patent: November 30, 2021Assignee: CANON KABUSHIKI KAISHAInventor: Naotoshi Ogawa
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Patent number: 11187878Abstract: Provided is a zoom lens including, in order from an object side to an image side: a front lens unit having a positive refractive power and configured not to move for zooming; one or two intermediate lens units having a negative refractive power as a whole and configured to move for zooming; a first rear lens unit having a negative refractive power and configured to move for zooming; a second rear lens unit having a positive refractive power and configured to move for zooming; and a third rear lens unit having a positive refractive power and configured not to move for zooming. In the zoom lens, all intervals between adjacent lens units are changed for zooming, and focal lengths of the front lens unit, the one or two intermediate lens units, the first rear lens unit, and the zoom lens at a telephoto end are appropriately set.Type: GrantFiled: August 7, 2020Date of Patent: November 30, 2021Assignee: CANON KABUSHIKI KAISHAInventor: Naotoshi Ogawa
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Patent number: 11143850Abstract: Provided is a zoom lens including, in order from object side: a positive first unit configured not to be moved for zooming; one or two negative second units configured to be moved for zooming; a stop configured to reduce an outer part of an off-axis light; two or three third units configured to be moved for zooming; and a fourth unit, in which focal lengths of the first unit and the second units, a distance on an optical axis from the stop to a vertex of a surface closest to the object side in the third units under a zoom state in which F-drop starts, and a distance on the optical axis from a vertex of a surface closest to the image side in the second units to the vertex of the surface closest to the object side in the third units under the zoom state are appropriately set.Type: GrantFiled: November 5, 2019Date of Patent: October 12, 2021Assignee: CANON KABUSHIKI KAISHAInventors: Masao Hori, Naotoshi Ogawa
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Patent number: 11137586Abstract: A zoom lens consists of, in order from the object side to the image side, a first lens unit having a positive refractive power and configured not to be moved for zooming, a second lens unit having a negative refractive power and configured to be moved for zooming, and a rear lens group including at least one lens unit. The first lens unit includes at least six lenses, a lens closest to the object side included in the first lens unit is a negative lens, and the zoom lens satisfies conditional expressions: ?1.65<f1n/f1<?1.10; 37<?1n<48; and 87<?pave<100, where f1n is a focal length of the negative lens, ?1n is an Abbe number of the negative lens with respect to d-line, f1 is a focal length of the first lens unit, and ?pave is an average of Abbe numbers of positive lenses included in the first lens unit with respect to d-line.Type: GrantFiled: February 25, 2019Date of Patent: October 5, 2021Assignee: CANON KABUSHIKI KAISHAInventors: Kazuya Shimomura, Naotoshi Ogawa, Masao Hori
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Patent number: 10955647Abstract: A zoom lens includes, in order from the object side, a positive first lens unit not moving for zooming, a negative second lens unit moving for zooming, positive third and fourth lens units moving for zooming, and a positive fifth lens unit not moving for zooming. Intervals between adjacent ones of the first to fifth lens units change for zooming. The third lens unit consists of positive, positive, and negative lenses in order from the object side. Appropriate settings are made to the zoom lens's focal lengths at the wide angle and telephoto ends, the lateral magnifications of the second lens unit at the wide angle and telephoto ends, the focal lengths of the third lens unit and the negative lens in the third lens unit, and the average Abbe number of the positive lenses and the Abbe number of the negative lens in the third lens unit.Type: GrantFiled: February 27, 2019Date of Patent: March 23, 2021Assignee: CANON KABUSHIKI KAISHAInventors: Naotoshi Ogawa, Masao Hori, Kazuya Shimomura
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Publication number: 20210048654Abstract: Provided is a zoom lens including, in order from an object side to an image side: a front lens unit having a positive refractive power and configured not to move for zooming; one or two intermediate lens units having a negative refractive power as a whole and configured to move for zooming; a first rear lens unit having a negative refractive power and configured to move for zooming; a second rear lens unit having a positive refractive power and configured to move for zooming; and a third rear lens unit having a positive refractive power and configured not to move for zooming. In the zoom lens, all intervals between adjacent lens units are changed for zooming, and focal lengths of the front lens unit, the one or two intermediate lens units, the first rear lens unit, and the zoom lens at a telephoto end are appropriately set.Type: ApplicationFiled: August 7, 2020Publication date: February 18, 2021Inventor: Naotoshi Ogawa
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Publication number: 20210033833Abstract: Provided is a zoom lens including in order from an object side: a positive first lens unit not moving for a change in magnification; a negative second lens unit moving for a change in magnification; and two or three rear lens units having a positive refractive power as a whole, at least one of the rear lens units being configured to move for a change in magnification. The first lens unit includes a negative first lens sub-unit not moving for focusing, a positive second lens sub-unit moving for focusing, a third lens sub-unit not moving for focusing, and a positive fourth lens sub-unit moving for focusing. An amount of movement of the second lens sub-unit during focusing from infinity to a minimum object distance, and an amount of movement of the fourth lens sub-unit during focusing from infinity to the minimum object distance satisfy a specific conditional expression.Type: ApplicationFiled: July 24, 2020Publication date: February 4, 2021Inventor: Naotoshi Ogawa
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Publication number: 20200158997Abstract: Provided is a zoom lens including, in order from object side: a positive first unit configured not to be moved for zooming; one or two negative second units configured to be moved for zooming; a stop configured to reduce an outer part of an off-axis light; two or three third units configured to be moved for zooming; and a fourth unit, in which focal lengths of the first unit and the second units, a distance on an optical axis from the stop to a vertex of a surface closest to the object side in the third units under a zoom state in which F-drop starts, and a distance on the optical axis from a vertex of a surface closest to the image side in the second units to the vertex of the surface closest to the object side in the third units under the zoom state are appropriately set.Type: ApplicationFiled: November 5, 2019Publication date: May 21, 2020Inventors: Masao Hori, Naotoshi Ogawa
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Patent number: 10578843Abstract: An image pickup apparatus includes: a mount to which an interchangeable lens is mountable; an image sensor; an optical system having a refractive power and imaging an object point located on an image side of a most-object-side surface of the optical system onto the image sensor; and an optical filter arranged between the optical system and the image sensor, and a distance on an optical axis from a flange surface of the mount to the object point located on the image side of the most-object-side surface, a distance on the optical axis from the flange surface of the mount to the image pickup element, and a lateral magnification of the optical system when the interchangeable lens is mounted to the image pickup apparatus and the object point located on the image side of the most-object-side surface, is imaged onto the image pickup element, are appropriately set.Type: GrantFiled: June 4, 2018Date of Patent: March 3, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Kazuya Shimomura, Naotoshi Ogawa
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Publication number: 20190265451Abstract: A zoom lens consists of, in order from the object side to the image side, a first lens unit having a positive refractive power and configured not to be moved for zooming, a second lens unit having a negative refractive power and configured to be moved for zooming, and a rear lens group including at least one lens unit. The first lens unit includes at least six lenses, a lens closest to the object side included in the first lens unit is a negative lens, and the zoom lens satisfies conditional expressions: ?1.65<f1n/f1<?1.10; 37<?1n<48; and 87<?pave<100, where f1n is a focal length of the negative lens, ?1n is an Abbe number of the negative lens with respect to d-line, f1 is a focal length of the first lens unit, and ?pave is an average of Abbe numbers of positive lenses included in the first lens unit with respect to d-line.Type: ApplicationFiled: February 25, 2019Publication date: August 29, 2019Inventors: Kazuya Shimomura, Naotoshi Ogawa, Masao Hori
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Publication number: 20190265448Abstract: A zoom lens includes, in order from the object side, a positive first lens unit not moving for zooming, a negative second lens unit moving for zooming, positive third and fourth lens units moving for zooming, and a positive fifth lens unit not moving for zooming. Intervals between adjacent ones of the first to fifth lens units change for zooming. The third lens unit consists of positive, positive, and negative lenses in order from the object side. Appropriate settings are made to the zoom lens's focal lengths at the wide angle and telephoto ends, the lateral magnifications of the second lens unit at the wide angle and telephoto ends, the focal lengths of the third lens unit and the negative lens in the third lens unit, and the average Abbe number of the positive lenses and the Abbe number of the negative lens in the third lens unit.Type: ApplicationFiled: February 27, 2019Publication date: August 29, 2019Inventors: Naotoshi Ogawa, Masao Hori, Kazuya Shimomura
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Publication number: 20190265447Abstract: A zoom lens includes, from the object side, a positive first lens unit not moving for zooming, a negative second lens unit moving for zooming, and a positive third lens unit moving for zooming. The second lens unit includes a negative lens closest to the object side, the third lens unit consists of a 3-1 sub-lens unit and a 3-2 sub-lens unit from the object side. Conditional expressions ?18.0<f1/f2<?3.0, 0.2<f21/f2<3.6, ?0.95<f21/r2<?0.25, 7.0<?2t/?2w<125.0, and 0.3<f31/f32<2.5, are satisfied where f1, f2, and f21 are the focal lengths of the first lens unit, the second lens unit, and the negative lens, r2 is an image-side radius of curvature of the negative lens, ?2w and ?2t are the lateral magnifications of the second lens unit at the wide angle end and the telephoto end, and f31 and f32 are the focal lengths of the 3-1 sub-lens unit and the 3-2 sub-lens unit.Type: ApplicationFiled: February 19, 2019Publication date: August 29, 2019Inventors: Masao Hori, Kazuya Shimomura, Naotoshi Ogawa
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Patent number: 10295806Abstract: A zoom lens, includes, in order from object side: a front unit including a unit including a first unit arranged closest to the object side and not moving for zooming; an Nf unit including three or more lenses and having a negative refractive power; an stop; a first rear unit moving during zooming; a second rear unit moving during zooming; and a third rear unit not moving for zooming, in which: the front unit includes four or more lenses and includes one or more units having a positive refractive power; and a difference between positions of the first rear unit at a wide angle end and a telephoto end, a difference between positions of the second rear unit at the wide angle end and the telephoto end, a focal length of the second rear unit, and a focal length of the zoom at the wide angle end are appropriately set.Type: GrantFiled: October 19, 2016Date of Patent: May 21, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Nobuyuki Miyazawa, Tomoyuki Nakamura, Naotoshi Ogawa, Kazuya Shimomura
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Publication number: 20180284404Abstract: An image pickup apparatus includes: a mount to which an interchangeable lens is mountable; an image sensor; an optical system having a refractive power and imaging an object point located on an image side of a most-object-side surface of the optical system onto the image sensor; and an optical filter arranged between the optical system and the image sensor, and a distance on an optical axis from a flange surface of the mount to the object point located on the image side of the most-object-side surface, a distance on the optical axis from the flange surface of the mount to the image pickup element, and a lateral magnification of the optical system when the interchangeable lens is mounted to the image pickup apparatus and the object point located on the image side of the most-object-side surface, is imaged onto the image pickup element, are appropriately set.Type: ApplicationFiled: June 4, 2018Publication date: October 4, 2018Inventors: Kazuya Shimomura, Naotoshi Ogawa
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Patent number: 10012821Abstract: An image pickup apparatus includes: a mount to which an interchangeable lens is mountable; an image sensor; an optical system having a refractive power and imaging an object point located on an image side of a most-object-side surface of the optical system onto the image sensor; and an optical filter arranged between the optical system and the image sensor, and a distance on an optical axis from a flange surface of the mount to the object point located on the image side of the most-object-side surface, a distance on the optical axis from the flange surface of the mount to the image pickup element, and a lateral magnification of the optical system when the interchangeable lens is mounted to the image pickup apparatus and the object point located on the image side of the most-object-side surface, is imaged onto the image pickup element, are appropriately set.Type: GrantFiled: July 25, 2016Date of Patent: July 3, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Kazuya Shimomura, Naotoshi Ogawa
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Publication number: 20170108678Abstract: A zoom lens, includes, in order from object side: a front unit including a unit including a first unit arranged closest to the object side and not moving for zooming; an Nf unit including three or more lenses and having a negative refractive power; an stop; a first rear unit moving during zooming; a second rear unit moving during zooming; and a third rear unit not moving for zooming, in which: the front unit includes four or more lenses and includes one or more units having a positive refractive power; and a difference between positions of the first rear unit at a wide angle end and a telephoto end, a difference between positions of the second rear unit at the wide angle end and the telephoto end, a focal length of the second rear unit, and a focal length of the zoom at the wide angle end are appropriately set.Type: ApplicationFiled: October 19, 2016Publication date: April 20, 2017Inventors: Nobuyuki Miyazawa, Tomoyuki Nakamura, Naotoshi Ogawa, Kazuya Shimomura