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1. 发明授权

US11378788B2 Zoom lens system and imaging apparatus 有权
公开(公告)号：US11378788B2
公开(公告)日：2022-07-05
申请号：US15733907
申请日：2019-06-04
申请人： NITTOH INC.
发明人： Tetsuya Abe
IPC分类号： G02B15/14
摘要： A zoom lens system (10) for imaging, includes, in order from an object side (11); a first lens group (G1) with negative refractive power that moves at the time of zooming; a second lens group (G2) with a positive refractive power that moves at the time of zooming, the second lens group including an aperture stop (St); a third lens group (G3) with a positive refractive power, the position of which is fixed relative to the image plane. The second lens group includes: a first sub-lens group (S1) with a positive refractive power arranged on the object side and having the aperture stop; and a second sub-lens group (S2) with a negative refractive power arranged on the image plane side and configured to move independently of the first sub-lens group at the time of focusing.

2. 发明授权

US11314042B2 Optical system for image pickup, and image pickup device 有权
公开(公告)号：US11314042B2
公开(公告)日：2022-04-26
申请号：US16614902
申请日：2018-05-25
申请人： NITTOH INC.
发明人： Akira Sawamoto
IPC分类号： G02B9/12 , G02B13/02 , H04N5/225
摘要： An optical system (10) for image pickup includes a first refractive optical system (Si) disposed on an object side with respect to an aperture stop (St) and a second refractive optical system (S2) disposed on an image plane side with respect to the aperture stop. The first refractive optical system includes, in order from the object side (11), a first lens group (G1) with positive refractive power, a second lens group (G2) with positive refractive power, and a third lens group (G3) with negative refractive power. The second refractive optical system includes, in order from the object side (11), a fourth lens group (G4) with positive refractive power, a fifth lens group (G5) with positive refractive power, and a sixth lens group (G6) with negative refractive power. When focusing from infinity to a short distance, the second lens group and the fourth lens group move toward the object side.

3. 发明申请

US20220026688A1 Lens for Filming 有权
公开(公告)号：US20220026688A1
公开(公告)日：2022-01-27
申请号：US17311732
申请日：2019-12-16
申请人： Nittoh Inc.
发明人： Kazuhiro Oe
IPC分类号： G02B13/02 , G02B9/64
摘要： A lens for filming includes a plurality of movable lenses and arranged apart from each other in the direction of an optical axis, and which move in the direction of the optical axis for focusing, and a fixed lens, which does not move, is provided between at least one pair of lenses adjacent to each other among them.

4. 发明申请

US20210263291A1 LENS SYSTEM AND IMAGING APPARATUS 有权
公开(公告)号：US20210263291A1
公开(公告)日：2021-08-26
申请号：US17252803
申请日：2019-06-18
申请人： NITTOH INC.
发明人： Yuya MIYASHITA
IPC分类号： G02B15/14 , G02B13/02 , G02B27/00
摘要： A lens system for imaging includes, in order from the object side, a first lens group with negative refractive power, a second lens group with positive refractive power, a third lens group with positive refractive power, a stop, and a fourth lens group with positive refractive power. The third lens group includes, closest to the image plane side, a cemented lens on the object side of the stop and whose image plane-side surface includes a concave surface on the object side. The fourth lens group includes, closest to the object side, a cemented lens on the image plane side of the stop and whose object-side surface includes a concave surface on the image plane side. A radius of curvature g3er of the object side concave surface and the radius of curvature g4fr of the image plane side concave surface satisfy the following condition: 2.5≤|g4fr/g3er|≤4.0.

5. 发明授权

US10754239B2 Projection optical assembly and projector device 有权
公开(公告)号：US10754239B2
公开(公告)日：2020-08-25
申请号：US16387700
申请日：2019-04-18
申请人： NITTOH INC.
发明人： Takahiko Matsuo
IPC分类号： G03B21/28 , G02B13/16 , G02B13/18 , G02B13/22 , G02B15/16 , G02B15/20 , G02B17/08 , G02B15/15 , G03B21/14 , H04N9/31 , G02B15/163
摘要： A projection optical system (1) that projects from a first image plane on a reducing side to a second image plane on an enlargement side, including a first refractive optical system (11) that includes eight lenses (L1) to (L8) and forms a first intermediate image (31) on the enlargement side using light that is incident from the reducing side, a second refractive optical system (12) that includes six lenses (L9) to (L14) and forms the first intermediate image (31) on the reducing side into a second intermediate image (32) on the enlargement side, and a first reflective optical system (20) that includes a first reflective surface (21a) with positive refractive power that is positioned closer to the enlargement side than the second intermediate image (32).

6. 发明申请

US20200241400A1 PROJECTION OPTICAL SYSTEM AND PROJECTOR 审中-公开
公开(公告)号：US20200241400A1
公开(公告)日：2020-07-30
申请号：US16471580
申请日：2017-12-21
申请人： NITTOH INC.
发明人： Masashi YOSHIDA , Takahiko MATSUO
IPC分类号： G03B21/14 , G03B21/28
摘要： A projection optical projects from a first image plane on a reducing side onto a second image plane on a magnifying side includes: a first optical system with a plurality of lenses that forms a first intermediate image on a first side of an optical axis inside the first optical system by light that is incident from the reducing side, into a second intermediate image on a second side of the optical axis at a position closer to the magnifying side than the first optical system. A second optical system includes a first reflective surface with positive power that is positioned closer to the magnifying side than the second intermediate image. The first optical system includes an intermediate lens. The first intermediate image is formed to be inclined to be closer to the reducing side as a distance from the optical axis increases so as to straddle the intermediate lens.

7. 发明授权

US10558008B2 Lens unit 有权
公开(公告)号：US10558008B2
公开(公告)日：2020-02-11
申请号：US15353382
申请日：2016-11-16
申请人： Nittoh Inc.
发明人： Takuya Kageyama
IPC分类号： G02B7/02
摘要： A lens unit includes a display member that is in a cylindrical shape, that rotates around an optical axis of the lens unit, and that has a scale indicating a photographing distance on an outer circumference surface thereof, and a window member that is provided over the display member, that exposes part of the outer circumference surface including the scale of the display member, and that hides the other part of the outer circumference surface of the display member. The photographing distance has first and second length units. The display member is movable along the optical axis between a first position and a second position. When the display member is in the first positon, the window member exposes the first length unit. Further, when the display member is in the second position, the window member exposes the second length unit.

8. 发明授权

US10557975B2 Reflecting mirror and mirror holding mechanism 有权
公开(公告)号：US10557975B2
公开(公告)日：2020-02-11
申请号：US15758245
申请日：2016-06-28
申请人： NITTOH INC.
发明人： Takashi Yamaguchi
IPC分类号： G02B5/10 , G02B7/182 , G03B21/28
摘要： In a reflection mirror having a concave curved reflection surface, when a surface of the reflection mirror on the side where the reflection surface is formed is a front surface, a surface thereof opposite to the front surface is a rear surface, a direction parallel to an optical axis of the reflection mirror is a first direction, and a direction from the front surface toward the rear surface which is oriented to one side in the first direction is a second direction, the rear surface of the reflection mirror has a flat surface orthogonal to the first direction and a wall surface that rises from at least a part of a region around the flat surface toward the second direction.

9. 发明授权

US10375363B2 Projection optical system and projector 有权
公开(公告)号：US10375363B2
公开(公告)日：2019-08-06
申请号：US16044982
申请日：2018-07-25
申请人： NITTOH INC.
发明人： Takahiko Matsuo
IPC分类号： H04N9/31 , G02B13/16 , G02B17/08 , G03B21/00 , G03B21/14 , G03B21/28 , G02B15/20
摘要： A projection optical system (10) projects from a first image plane (5) on a reducing side to a second image plane (6) on an enlargement side. The projection optical system (10) includes a first optical system (11) that includes a plurality of lenses and forms a first intermediate image (51) formed inside the first optical system (11) by light incident from the reducing side into a second intermediate image (52) on the enlargement side of the first optical system (11); a second optical system (12) that includes a first reflective surface (M1) with positive refractive power which is positioned further to the enlargement side than the second intermediate image (52); and a glass block (30) that is disposed between the first optical system (11) and the first reflective surface (M1), the glass block (30) passing light rays from the first optical system (11) to the second intermediate image (52).

10. 发明申请

US20190154950A1 PROJECTION LENS BARREL AND PROJECTION DISPLAY DEVICE 审中-公开
公开(公告)号：US20190154950A1
公开(公告)日：2019-05-23
申请号：US16252995
申请日：2019-01-21
申请人： Nittoh Inc.
发明人： Takafumi HANAOKA , Takahiko MATSUO , Takuya FUJIMATSU
IPC分类号： G02B7/02 , G03B21/14 , G02B13/16 , G02B27/00 , G02B7/04
摘要： In order to provide a projection lens barrel and a projection display device that are capable of correcting the optical characteristics of a plurality of lens groups, a projection lens barrel, comprising a lens optical system causing light from an image display element to be formed as a projected image on a screen, also comprises correction mechanisms that move each of at least two lens groups along an optical axis and correct the optical characteristics to be corrected, said lens groups each having different optical characteristics for correction in order to suppress reduction in image quality of a projected image caused by changes in optical characteristics caused by temperature changes in the projection lens barrel.

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