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公开(公告)号：US20210333526A1
公开(公告)日：2021-10-28
申请号：US17370196
申请日：2021-07-08
Inventor： Takuya IMAOKA , Qinghua ZHAO
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 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. The magnification optical system has a first lens element and a second lens element in this order from the magnification side, and the second lens element has a positive power. The optical system satisfies the following condition (1): 23
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公开(公告)号：US20170212334A1
公开(公告)日：2017-07-27
申请号：US15403516
申请日：2017-01-11
Inventor： Takuya IMAOKA
Abstract: A lens system which includes a lens group including at least one lens element and forms an image on an image sensor which is rectangular with a first side and a second side greater than or equal to the first side in length, the lens system including: in order from an object side to an image surface side, a front lens group; a diaphragm; and a rear lens group, wherein at least one of the front lens group and the rear lens group includes a freeform surface lens asymmetric about an optical axis, and the lens system satisfies 1
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公开(公告)号：US20160274342A1
公开(公告)日：2016-09-22
申请号：US15070375
申请日：2016-03-15
Inventor： Qinghua ZHAO , Yoshiyuki HISATOMI , Takuya IMAOKA
IPC: G02B15/173 , G02B27/00
CPC classification number: G02B15/173 , G02B27/0025
Abstract: A zoom lens system according to the present disclosure includes, in order from an object side to an image plane side, a first lens group having positive optical power; a second lens group having negative optical power; a third lens group having positive optical power; and a subsequent lens group including a fourth lens group, a fifth lens group, and a sixth lens group. The first lens group comprises, in order from the object side, a first lens element having negative optical power; a second lens element having positive optical power; a third lens element having positive optical power; and a fourth lens element having positive optical power. The fifth lens group in the subsequent lens group has negative optical power. The first lens group is fixed with respect to the image plane in zooming from a wide-end to a tele-end upon image shooting.
Abstract translation: 根据本公开的变焦透镜系统包括从物体侧到像面侧的顺序具有正光焦度的第一透镜组; 具有负光焦度的第二透镜组; 具有正光焦度的第三透镜组; 以及包括第四透镜组，第五透镜组和第六透镜组的后续透镜组。 第一透镜组从物体依次包括具有负光焦度的第一透镜元件; 具有正光焦度的第二透镜元件; 具有正光焦度的第三透镜元件; 以及具有正光焦度的第四透镜元件。 后续透镜组中的第五透镜组具有负光焦度。 在图像拍摄时，第一透镜组相对于图像平面被从广角端变焦成远端端。
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公开(公告)号：US20150237242A1
公开(公告)日：2015-08-20
申请号：US14687075
申请日：2015-04-15
Inventor： Takuya IMAOKA
CPC classification number: H04N5/2254 , G02B15/14 , G02B15/173 , G02B27/646
Abstract: A zoom lens system, in order from an object side to an image side, comprising: a first lens unit having positive optical power; a second lens unit having negative optical power; a third lens unit having positive optical power; a fourth lens unit having negative optical power, a fifth lens unit having negative optical power; and a sixth lens unit having positive optical power, wherein the condition: 3.5
Abstract translation: 变焦透镜系统，从物体侧到像侧依次包括：具有正光焦度的第一透镜单元; 具有负光焦度的第二透镜单元; 具有正光焦度的第三透镜单元; 具有负光焦度的第四透镜单元，具有负光焦度的第五透镜单元; 以及具有正光焦度的第六透镜单元，其中满足条件：3.5 <| f6 / f2 | <15.5（f2：第二透镜单元的焦距，f6：第六透镜单元的焦距）。
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公开(公告)号：US20230384571A1
公开(公告)日：2023-11-30
申请号：US18232936
申请日：2023-08-11
Inventor： Qinghua ZHAO , Katsu YAMADA , Takuya IMAOKA
CPC classification number: G02B15/1461 , G02B13/0095 , G02B13/16
Abstract: The present disclosure is directed to an optical system internally having an intermediate imaging position that is conjugate with both of a magnification conjugate point on a magnification side and a reduction conjugate point on reduction side, including: 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 the relay optical system includes a plurality of moving lens groups which are independently movable in an optical axis direction during zooming, and wherein the reduction side-closest moving lens group that is positioned closest to the reduction side among the plurality of moving lens groups has a negative refractive power.
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Patent Agency Ranking
公开(公告)号：US20220283412A1
公开(公告)日：2022-09-08
申请号：US17748636
申请日：2022-05-19
Inventor： Qinghua ZHAO , Takuya IMAOKA , Katsu YAMADA
Abstract: The present disclosure is directed to an optical system internally having an intermediate imaging position that is conjugate 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 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 a first lens element located closest to the magnification side among the plurality of lens elements in magnification optical system is an aspherical lens having a negative power, the optical system satisfies the conditions (1) to (3).
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公开(公告)号：US20220214528A1
公开(公告)日：2022-07-07
申请号：US17703192
申请日：2022-03-24
Inventor： Yoshio MATSUMURA , Hiroyuki SHOBAYASHI , Takuya IMAOKA , Tomoko IIYAMA
Abstract: A lens system includes lens elements and a diaphragm. The lens elements include freeform lenses each having a freeform surface asymmetrical with respect to first and second directions. At least one freeform lens is placed on the image plane side of the diaphragm. The lens system satisfies a following conditional expression (1); 0.0075
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公开(公告)号：US20210356693A1
公开(公告)日：2021-11-18
申请号：US17387028
申请日：2021-07-28
Inventor： Takuya IMAOKA , Qinghua ZHAO
Abstract: The present embodiment discloses an interchangeable lens that can be detachably attached to an apparatus body having an image forming surface on which an image is formed, and the interchangeable lens has a magnification conjugate point on a magnification side and a reduction conjugate point on a reduction side. The interchangeable lens includes a focus lens group that can move along an optical axis to adjust a focus at the magnification conjugate point and a flange back distance correction lens group that can move along the optical axis to correct an error in a flange back distance of the interchangeable lens with respect to the image forming surface.
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公开(公告)号：US20200319433A1
公开(公告)日：2020-10-08
申请号：US16905207
申请日：2020-06-18
Inventor： Takuya IMAOKA , Hideo ONISHI , Kenji IKEO , Katsu YAMADA
Abstract: A projection lens system projects an image of a reduction side into a magnification side in an image projection device, a back glass being disposed on the reduction side. In the projection lens system, all of one or more negative lenses that satisfy, in a surface on the reduction side or a surface on the magnification side, condition |h/H|
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公开(公告)号：US20190025561A1
公开(公告)日：2019-01-24
申请号：US16137637
申请日：2018-09-21
Inventor： Takuya IMAOKA
Abstract: An imaging optical system includes a plurality of lens groups each moving such that spaces between each one of the plurality of lens groups change during a zooming. The imaging optical system conjugates a conjugate point on a magnification side and an intermediate imaging position, and conjugates a conjugate point on a reduction side and the intermediate imaging position. The imaging optical system includes a first lens group located at a furthest place on the magnification side and a rear group in this order from the magnification side toward the reduction side. The first lens group includes a field curvature correction lens group moving along an optical axis when an amount of a field curvature is changed, and a focusing lens group. The imaging optical system satisfies condition (4) below: |{(1−βcw2)×βcrw2}/{(1−βfw2)×βfrw2}|
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