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公开(公告)号：US20220221694A1
公开(公告)日：2022-07-14
申请号：US17705745
申请日：2022-03-28
Inventor： Hiroyuki SHOBAYASHI , Yoshio MATSUMURA , Takuya IMAOKA , Tomoko IIYAMA
Abstract: A lens system includes a plurality of lens elements arranged from an object side to an image plane side, and a diaphragm arranged between the plurality of lens elements. The plurality of lens elements include a plurality of freeform lenses each having a freeform surface that is asymmetrical with respect to a first direction and a second direction which cross with each other. At least one freeform lens is placed on the image plane side of the diaphragm. With a lens thickness T1 in the first direction at a maximum height of an axial ray and a lens thickness T2 in the second direction at the maximum height of the axial ray, at least one freeform lens satisfying 0.3
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公开(公告)号：US20160209632A1
公开(公告)日：2016-07-21
申请号：US14996501
申请日：2016-01-15
Inventor： Takuya IMAOKA
IPC: G02B15/20 , G03B7/20 , G02B7/14 , G02B15/177 , G02B5/00
CPC classification number: G03B7/20 , G02B13/009 , G02B15/155 , G02B15/161 , G02B15/177 , G02B15/20 , G02B15/22
Abstract: A zoom lens system according to the present disclosure includes a plurality of lens groups each of which is made up of at least one lens element. The zoom lens system includes, in order from an object side to an image side: a first focusing lens group having a negative power; and a second focusing lens group having a positive power, wherein when zooming is performed from a wide end to a telephoto end, the first focusing lens group and the second focusing lens group move along an optical axis, when focusing is performed from an infinity focusing state to a proximity object focusing state, the first focusing lens group and the second focusing lens group move to perform the focusing, and a predetermined condition is satisfied.
Abstract translation: 根据本公开的变焦透镜系统包括多个透镜组，每个透镜组由至少一个透镜元件组成。 变焦透镜系统从物体侧到像侧依次包括具有负光焦度的第一聚焦透镜组; 以及具有正功率的第二聚焦透镜组，其中当从宽端到望远端进行变焦时，当从无限远聚焦进行聚焦时，第一聚焦透镜组和第二聚焦透镜组沿着光轴移动 状态到接近物体聚焦状态，第一聚焦透镜组和第二聚焦透镜组移动以执行聚焦，并且满足预定条件。
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公开(公告)号：US20250138407A1
公开(公告)日：2025-05-01
申请号：US18987771
申请日：2024-12-19
Inventor： Takuya IMAOKA , Hiroaki OKAYAMA
Abstract: The present disclosure is directed to an optical system having a reduction conjugate point on a reduction side and a magnification conjugate point on a magnification side, the optical system comprising: a prism including a first transmission surface located on the magnification side, a second transmission surface located on the reduction side, and at least three reflection surfaces located on an optical path between the first and second transmission surfaces; wherein the at least three reflection surfaces include first and second reflection surfaces in order from the magnification side to the reduction side, and a most reduction-side reflection surface located closest to the reduction side, wherein an intermediate imaging position related with both the reduction and magnification conjugate points is positioned inside the prism, and wherein the first reflection surface is positioned in a region where a plurality of principal rays traveling inside the prism are converged on.
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公开(公告)号：US20230288685A1
公开(公告)日：2023-09-14
申请号：US18198358
申请日：2023-05-17
Inventor： Tsuneo UCHIDA , Takuya IMAOKA , Katsu YAMADA , Satoshi KUZUHARA
CPC classification number: G02B17/086 , G02B13/18 , G02B13/16 , G03B21/28 , H04N23/55
Abstract: The optical system includes a first sub-optical system including an aperture stop and a second sub-optical system including a prism. The prism has a first transmission surface located on a reduction side, a second transmission surface located on a magnification side, and at least one reflection surface between the first transmission surface and the second transmission surface. The first sub-optical system includes a plurality of rotationally symmetric lens elements. When the axis passing through at least two centers of the rotationally symmetric lens element is defined as a reference optical axis, at least one optical surface of the prism is formed such that in a plane perpendicular to the reference optical axis, a maximum angle θmax and a minimum angle θmin in terms of an angle at which a principal ray of light rays having an image-forming relationship on a concentric circle centered on an intersection of the reference optical axis and a reduction conjugate point of the rectangular region intersects a normal line of the plane at a position where the principal ray is made incident on the optical surface satisfy the following Expression (1): 45°>|θmax|−|θmin|>0.014°.
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公开(公告)号：US20210116688A1
公开(公告)日：2021-04-22
申请号：US17113376
申请日：2020-12-07
Inventor： Takuya IMAOKA
Abstract: A projection lens system is a projection lens system including a plurality of lens groups, the plurality of lens groups each including one or more lenses and moving such that an interval between the lens groups changes during a zooming action, the projection lens system including a first lens group disposed closest to a magnification side, the first lens group having positive power, wherein the first lens group includes one negative lens satisfying 0.0005
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Patent Agency Ranking
公开(公告)号：US20250102780A1
公开(公告)日：2025-03-27
申请号：US18975410
申请日：2024-12-10
Inventor： Takuya IMAOKA
Abstract: The present disclosure is directed to an optical system internally having an intermediate imaging position that is conjugate with each of a magnification conjugate point on a magnification side and a reduction conjugate point on a reduction side, the optical system comprising: a magnification optical system including a plurality of lens elements and positioned on the magnification side with respect to the intermediate imaging position; and a relay optical system including a plurality of lens elements and positioned on the reduction side with respect to the intermediate imaging position; wherein a first lens element positioned closest to the magnification side of the magnification optical system has a positive power, and the optical system satisfies the following condition (1): 0.9≤f1/f2≤1.5 . . . (1), where f1 is a focal length of the magnification optical system, and f2 is a focal length of the relay optical system.
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公开(公告)号：US20240329510A1
公开(公告)日：2024-10-03
申请号：US18735477
申请日：2024-06-06
Inventor： Takuya IMAOKA
Abstract: The present disclosure is directed to an optical system having a reduction conjugate point on a reduction side and a magnification conjugate point on a magnification side that are optically conjugate with each other, and includes a prism including a first transmission surface located on the reduction side, a second transmission surface located on the magnification side, and at least three reflection surfaces located on an optical path therebetween, wherein in the meridional plane, two light rays traveling in a direction perpendicular to the first rectangular region from two points on the first rectangular region intersect at two intersection positions after passing through the first transmission surface and then reflected by the at least three reflection surfaces and before passing through the second transmission surface, and the number of reflection of the two light rays intersecting at each intersection position before reaching the respective intersection positions is the same.
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公开(公告)号：US20220276475A1
公开(公告)日：2022-09-01
申请号：US17747323
申请日：2022-05-18
Inventor： Takuya IMAOKA , Qinghua ZHAO , Katsu YAMADA
Abstract: The present disclosure is directed to an optical system internally having an intermediate imaging position that is conjugate to magnification and reduction conjugate points, respectively, the optical system including: a magnification optical system having a plurality of lens elements, positioned on the magnification side with respect to the intermediate imaging position; and a relay optical system having a plurality of lens elements, positioned on the reduction side with respect to the intermediate imaging position, wherein there are a plurality of air distances among the lens elements, the magnification optical system includes a magnification optical system front group positioned on the magnification side with respect to the longest air distance in the magnification optical system and a magnification optical system rear group positioned on the reduction side with respect to the longest air distance, and the optical system satisfies the conditions (1) and (2).
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公开(公告)号：US20240045185A1
公开(公告)日：2024-02-08
申请号：US18381792
申请日：2023-10-19
Inventor： Takuya IMAOKA
CPC classification number: G02B15/143103 , G02B13/0095 , G02B15/144111
Abstract: The present disclosure is directed to an optical system internally having an intermediate imaging position MI that is conjugate with both of a magnification conjugate point on a magnification side and a reduction conjugate point on a reduction side, the optical system including: a first positive lens group GP1 including a plurality of lens elements and positioned on the magnification side with respect to the intermediate imaging position; a second positive lens group GP2 including a plurality of lens elements and positioned between the first positive lens group GP1 and the intermediate imaging position Ml; and a negative lens group GN including a plurality of lens elements and positioned on the reduction side with respect to the intermediate imaging position MI, wherein, during focusing, the first positive lens group GP1 and the negative lens group GN move in an optical axis direction, and the second positive lens group GP2 is stationary.
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公开(公告)号：US20210341715A1
公开(公告)日：2021-11-04
申请号：US17377776
申请日：2021-07-16
Inventor： Qinghua ZHAO , Takuya IMAOKA
Abstract: The present disclosure is directed to an optical system internally having an intermediate imaging position that is conjugated to a magnification conjugate point on a magnification side and a reduction conjugate point on a reduction side, respectively, the optical system including: a magnification optical system having A (A is an integer of three or more) pieces of lens elements, positioned on the magnification side with respect to the intermediate imaging position; and a relay optical system having B (B is an integer of two or more) pieces of lens elements, positioned on the reduction side with respect to the intermediate imaging position. A first lens group composed of β pieces (β is one or more and less than B) of lens elements positioned first from the magnification side in the relay optical system has a negative power.
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