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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：US20180239118A1
公开(公告)日：2018-08-23
申请号：US15957544
申请日：2018-04-19
Inventor： Tsuneo UCHIDA , Katsu YAMADA
Abstract: A projection optical system is an optical system that magnifies and projects an image onto a projection surface from an oblique position defined by a Y-axis and a Z-axis. The image is displayed on an image display element, is defined by a positive direction of an X-axis and a positive direction of the Y-axis, and includes a long side parallel to the X-axis and a short side parallel to the Y-axis when a positional relationship is expressed using an XYZ coordinate. The projection optical system includes a transmission optical system and a transmission element. An incident angle of a light beam of the image incident on a reference vertical intersecting line with respect to one of surfaces of the transmission element is zero only at one point on the reference vertical intersecting line.
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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：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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公开(公告)号：US20220082805A1
公开(公告)日：2022-03-17
申请号：US17511799
申请日：2021-10-27
Inventor： Tsuneo UCHIDA , Katsu YAMADA , Satoshi KUZUHARA
Abstract: An optical system according to the present disclosure 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 the reduction side, a second transmission surface located on the magnification side, and at least one reflection surface located on the optical path between the first transmission surface and the second transmission surface. A first reflection surface closest to the intermediate imaging position has a shape with a concave surface facing a direction into which a light ray incident on first the reflection surface is reflected. A curvature shape of the first reflection surface is set such that some of multiple principal rays passing through the reduction conjugate point intersect on the optical path between the first reflection surface and the second transmission surface.
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Patent Agency Ranking
公开(公告)号：US20170285451A1
公开(公告)日：2017-10-05
申请号：US15464585
申请日：2017-03-21
Inventor： Tsuneo UCHIDA , Katsu YAMADA
CPC classification number: G03B21/147 , G02B13/16 , G02B13/18 , G02B17/08 , G02B17/0852 , G03B21/28
Abstract: A projection optical system of the present disclosure projects onto a projection surface (screen) an image ray bundle formed on an image display element, and includes a transmissive optical system that is positioned on a side of an emission surface of the image display element and has positive power, and a reflective optical system including at least one mirror for reflecting, toward the projection surface, light rays emitted from the transmissive optical system. The transmissive optical system includes an aperture stop, at least one positive lens disposed closer to the image display element than the aperture stop is, a first positive meniscus-shaped lens, a negative lens, and a second positive meniscus-shaped lens with the first and second positive lenses and the negative lens being closer to the projection surface than the aperture stop is. The first and second positive lenses are disposed with the negative lens being disposed therebetween so that their respective concave surfaces face each other. During focusing, a spacing between the first positive lens and the negative lens and a spacing between the second positive lens and the negative lens remain unchanged.
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公开(公告)号：US20250138290A1
公开(公告)日：2025-05-01
申请号：US19008754
申请日：2025-01-03
Inventor： Tsuneo UCHIDA , Katsu YAMADA , Satoshi KUZUHARA
Abstract: An optical system according to the present disclosure 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 the reduction side, a second transmission surface located on the magnification side, and at least one reflection surface located on the optical path between the first transmission surface and the second transmission surface. A first reflection surface closest to the intermediate imaging position has a shape with a concave surface facing a direction into which a light ray incident on first the reflection surface is reflected. A curvature shape of the first reflection surface is set such that some of multiple principal rays passing through the reduction conjugate point intersect on the optical path between the first reflection surface and the second transmission surface.
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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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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：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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