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公开(公告)号：US10976522B2
公开(公告)日：2021-04-13
申请号：US15722181
申请日：2017-10-02
Applicant: HOYA CORPORATION
Inventor： Yutaka Takakubo , Eijiroh Tada
Abstract: An imaging optical system includes a positive or negative first lens group, a diaphragm and a positive second lens group. The first lens group includes a positive lens element, provided closest to the object side, that has an aspherical surface on the object side thereof, the aspherical surface including a paraxial convex surface convexing toward the object side. This aspherical surface has a curvature that is positive along a meridional cross-section at the paraxial portion thereof, and the curvature of the meridional cross-section changes from a positive value to a negative value in an area within 75% of an effective aperture from the paraxial portion toward the periphery of the aspherical surface.
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公开(公告)号：US10698183B2
公开(公告)日：2020-06-30
申请号：US16165272
申请日：2018-10-19
Applicant: HOYA CORPORATION
Inventor： Eijiroh Tada , Yutaka Takakubo
Abstract: The object-side surface of a negative lens element closest to the object side within a first lens group includes a paraxial convex surface and a peripheral surface having a curvature less than that of the paraxial surface. The image-side surface of a last lens element of a second lens group includes a paraxial concave surface and a peripheral surface having an inflection point changing from positive to negative values. 0.10
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公开(公告)号：US09874734B2
公开(公告)日：2018-01-23
申请号：US15240454
申请日：2016-08-18
Applicant: HOYA CORPORATION
Inventor： Yutaka Takakubo , Eijiroh Tada
IPC: G02B15/14 , G02B9/00 , G02B15/177 , G02B13/00 , G02B13/18 , G02B9/34 , G02B13/04 , G02B15/24 , G02B5/00
CPC classification number: G02B15/177 , G02B5/005 , G02B9/34 , G02B13/004 , G02B13/0045 , G02B13/0065 , G02B13/009 , G02B13/04 , G02B13/18 , G02B15/14 , G02B15/24
Abstract: A zoom optical system includes a negative first lens group having a first deflection optical element, a positive second lens group, a positive third lens group, a positive fourth lens group, and a second deflection optical element, in that order from the object side. The first lens group is provided at a fixed position relative to an imaging plane. Zooming is performed by moving at least the second and third lens groups so that distances between adjacent lens groups of the first through fourth lens groups change. The third lens group is a focusing lens group which moves along the optical axis during focusing. The following condition (1) is satisfied: 0.2
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公开(公告)号：US20190121095A1
公开(公告)日：2019-04-25
申请号：US16165272
申请日：2018-10-19
Applicant: Hoya Corporation
Inventor： Eijiroh Tada , Yutaka Takakubo
Abstract: The object-side surface of a negative lens element closest to the object side within a first lens group includes a paraxial convex surface and a peripheral surface having a curvature less than that of the paraxial surface. The image-side surface of a last lens element of a second lens group includes a paraxial concave surface and a peripheral surface having an inflection point changing from positive to negative values. 0.10
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Patent Agency Ranking
公开(公告)号：US11774649B2
公开(公告)日：2023-10-03
申请号：US17237617
申请日：2021-04-22
Applicant: HOYA CORPORATION
Inventor： Toshiki Nakamura , Yutaka Takakubo , Yoshitake Tanno , Yasushi Tsutsumi , Naomi Matsumoto
IPC: G02B5/18
CPC classification number: G02B5/1814 , G02B2005/1804
Abstract: An optical element includes a glass body including a colored layer provided inside the glass body and positioned at an optical function surface of the optical element. An optical apparatus including the optical element is also provided.
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公开(公告)号：US11656456B2
公开(公告)日：2023-05-23
申请号：US16991411
申请日：2020-08-12
Applicant: HOYA CORPORATION
Inventor： Toshiki Nakamura , Masaru Eguchi , Yutaka Takakubo , Yoshitake Tanno , Naomi Matsumoto
CPC classification number: G02B27/0018 , G02B1/11 , G02B5/003
Abstract: An optical element including a glass body is provided. The optical element includes a colored layer provided inside the glass body and positioned outside an effective aperture of the optical element. Coloring of the colored layer is a reduction pigment occurring in a glass component of the glass body. The colored layer suppresses occurrence of stray light and obtains sufficient light-shielding properties, so that a superior image quality can be achieved.
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公开(公告)号：US10209494B2
公开(公告)日：2019-02-19
申请号：US16108825
申请日：2018-08-22
Applicant: HOYA CORPORATION
Inventor： Akitoshi Usui , Yutaka Takakubo
Abstract: An imaging optical system includes a positive or negative first lens group including a negative lens element closest to the object, a diaphragm, and a positive second lens group. The negative lens element closest to the object has an object-side aspherical surface including a paraxial convex surface, a paraxial curvature that is the greatest within the effective aperture, and a portion within the effective aperture having a curvature less than ½ of the paraxial curvature. These conditions are satisfied: R1/f 0.4 −2.5 56 “f” designates the overall focal length; f1, R1 and D1 respectively designate the focal length, paraxial radius of curvature of an object-side surface, and thickness, of the negative lens element closest to the object; and V designates the Abbe number regarding the d-line of a lens element, within the second lens group, closest to the diaphragm.
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公开(公告)号：US09429767B2
公开(公告)日：2016-08-30
申请号：US14677380
申请日：2015-04-02
Applicant: HOYA CORPORATION
Inventor： Yutaka Takakubo
IPC: G02B27/64 , G02B13/00 , G02B15/177
CPC classification number: G02B27/646 , G02B13/0065 , G02B15/177
Abstract: An imaging optical system includes a front lens group including a front lens element and a reflector element which reflects a light bundle that exits from the front lens element; and a rear lens group on the image side of the front lens group. The front lens element is a spherically-swingable lens group which suppresses image shake by spherically-swinging about a predetermined spherical-swing center in accordance with vibrations applied to the imaging optical system. The following conditions (1) and (2) are satisfied: νd>58 (1), and f/y>3 (2), wherein νd designates the Abbe number with respect to the d-line of at least one lens element of the spherically-swingable lens group, f designates the focal length of the imaging optical system, in a state where the focal length is at a maximum, and y designates the maximum image height of the imaging plane.
Abstract translation: 成像光学系统包括：前透镜组，其包括前透镜元件和反射从前透镜元件出射的光束的反射器元件; 和前透镜组的像侧的后透镜组。 前透镜元件是通过根据施加到成像光学系统的振动围绕预定的球形摆动中心进行球形摆动而抑制图像抖动的球形摆动透镜组。 满足以下条件（1）和（2）：vd> 58（1）和f / y> 3（2），其中νd表示相对于至少一个透镜元件的d线的阿贝数 在焦距最大的状态下，球面摆动透镜组f表示成像光学系统的焦距，y表示成像面的最大图像高度。
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公开(公告)号：US10082648B2
公开(公告)日：2018-09-25
申请号：US15450456
申请日：2017-03-06
Applicant: HOYA CORPORATION
Inventor： Akitoshi Usui , Yutaka Takakubo
CPC classification number: G02B13/006 , G02B9/60 , G02B9/62 , G02B9/64 , G02B13/002 , G02B13/0045 , G02B13/18 , G02B15/177
Abstract: An imaging optical system includes a positive or negative first lens group including a negative lens element closest to the object, a diaphragm, and a positive second lens group. The negative lens element closest to the object has an object-side aspherical surface including a paraxial convex surface, a paraxial curvature that is the greatest within the effective aperture, and a portion within the effective aperture having a curvature less than ½ of the paraxial curvature. These conditions are satisfied: R1/f 0.4 −2.5 56 “f” designates the overall focal length; f1, R1 and D1 respectively designate the focal length, paraxial radius of curvature of an object-side surface, and thickness, of the negative lens element closest to the object; and V designates the Abbe number regarding the d-line of a lens element, within the second lens group, closest to the diaphragm.
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