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公开(公告)号：US12253659B2
公开(公告)日：2025-03-18
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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公开(公告)号：US09746651B2
公开(公告)日：2017-08-29
申请号：US15070375
申请日：2016-03-15
Inventor： Qinghua Zhao , Yoshiyuki Hisatomi , Takuya Imaoka
IPC: G02B15/15 , 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.
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公开(公告)号：US20240288755A1
公开(公告)日：2024-08-29
申请号：US18653197
申请日：2024-05-02
Inventor： Takuya Imaoka
CPC classification number: G03B21/142 , G02B13/02 , G02B13/16 , G02B27/025 , G02B27/18
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, the optical system including an imaging optical system having a plurality of lens elements that are rotationally symmetric with respect to an optical axis, and an aperture stop, wherein a first rectangular region at the reduction conjugate point and a second rectangular region at the magnification conjugate point have an optically conjugate image forming relation, a normal line of the second rectangular region is inclined at a tilt angle of 10 degrees or more with respect to the optical axis, and a tilt correction plate CP that corrects defocus in the first rectangular region or the second rectangular region is positioned on the reduction side of the aperture stop between the reduction conjugate point and the magnification conjugate point.
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公开(公告)号：US12072548B2
公开(公告)日：2024-08-27
申请号：US17387028
申请日：2021-07-28
Inventor： Takuya Imaoka , Qinghua Zhao
CPC classification number: G02B7/14 , G02B13/02 , G02B13/06 , G02B15/146 , G03B17/14
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：US11982800B2
公开(公告)日：2024-05-14
申请号：US17370196
申请日：2021-07-08
Inventor： Takuya Imaoka , Qinghua Zhao
CPC classification number: G02B15/145127 , G02B13/0095 , G02B13/18
Abstract: An optical system internally has 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 includes a magnification optical system having a first lens element and a second lens element 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 first lens element and the second lens element are positioned in this order from the magnification side, and the second lens element has a positive power. The optical system satisfies: 23
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Patent Agency Ranking
公开(公告)号：US20240126157A1
公开(公告)日：2024-04-18
申请号：US18545433
申请日：2023-12-19
Inventor： Takuya Imaoka
CPC classification number: G03B21/28 , G02B13/0065 , G02B17/0856
Abstract: An optical system includes lenses and a prism. The prism includes a first transmissive surface, a first reflective surface, a second reflective surface, and a second transmissive surface. A first rectangular region at a reduction conjugate point: has an imaging relationship in which the first rectangular region is conjugate to a second rectangular region at a magnification conjugate point; and does not intersect with an optical axis. When a space is divided into a first space and a second space, all principal rays passing through the first rectangular region pass through the first rectangular region, the first transmissive surface, and the first reflective surface in the first space, and pass through the second reflective surface and the second transmissive surface in the second space.
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公开(公告)号：US11520126B2
公开(公告)日：2022-12-06
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：US12287462B2
公开(公告)日：2025-04-29
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：US12007539B2
公开(公告)日：2024-06-11
申请号：US17113376
申请日：2020-12-07
Inventor： Takuya Imaoka
CPC classification number: G02B15/143105 , G02B13/16
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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公开(公告)号：US20220397749A1
公开(公告)日：2022-12-15
申请号：US17821231
申请日：2022-08-22
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 conjugated to a magnification conjugate point on a magnification side and a reduction conjugate point on a reduction side, respectively, the optical system comprising: a magnification optical system positioned on the magnification side with respect to the intermediate imaging position; and a relay optical system positioned on the reduction side with respect to the intermediate imaging position; the relay optical system including: a first lens group positioned closest to the magnification side; two lens groups positioned on the reduction side with respect to the first lens group; and a negative lens group interposed between the two lens groups, wherein during zooming the negative lens is fixed, while the two lens groups are displaced.
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