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公开(公告)号：US20210124244A1
公开(公告)日：2021-04-29
申请号：US17257359
申请日：2019-06-25
Applicant: Nittoh Inc.
Inventor： Takahiko Matsuo
Abstract: In a projection optical system for projecting an optical image from a first image plane on a reduction side onto a second image plane on a magnification side, the system includes an achromatic lens including a positive lens and a negative lens separately arranged in this order from the reduction side toward the magnification side, and the negative lens having a refractive index of 1.7 or higher and an Abbe's number of 55 or less satisfies the following expression: 3.5≤|R|/|f| (1), where the radius of curvature of a light incident surface is R and the focal length of an entire projection optical system is f.
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公开(公告)号：US09785043B2
公开(公告)日：2017-10-10
申请号：US14400820
申请日：2013-12-26
Applicant: NITTOH INC.
Inventor： Takahiko Matsuo
CPC classification number: G03B21/53 , G02B7/028 , G02B7/04 , G02B13/16 , G02B17/08 , G02B17/0896 , G03B21/005 , G03B21/28
Abstract: A projection optical system (2) projects from a DMD (7) on a reducing side onto a screen (9) on an enlargement side, and includes: a first refractive optical system (10) that forms a first intermediate image (51) on the enlargement side using light incident from the reducing side; a second refractive optical system (20) that forms the first intermediate image (51) on the reducing side into a second intermediate image (52) on the enlargement side; and a first reflective optical system (30) including a first reflective surface (31a) with positive refractive power that is positioned on the enlargement side of the second intermediate image (52), wherein the second refractive optical system (20) includes a first focus lens group (61) that moves when focusing is carried out, and the first focus lens group (61) includes at least one lens (L13) included in the second refractive optical system (20).
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公开(公告)号：US20230305275A1
公开(公告)日：2023-09-28
申请号：US18019712
申请日：2021-08-03
Applicant: Nittoh Inc.
Inventor： Takahiko Matsuo
CPC classification number: G02B13/16 , G02B15/143103 , G02B7/04
Abstract: An image formation optical system includes a first optical system, in which a first refractive system is arranged toward the reduction side of an intermediate image and a second refractive system is arranged toward the magnification side of the intermediate image, and the first refractive system has a first stop, and the second refractive system has a second stop. Lens surfaces are arranged next to and both toward the reduction side and toward the magnification side of the first stop and the second stop, and the following condition is satisfied:
1.5-
公开(公告)号：US10754239B2
公开(公告)日：2020-08-25
申请号：US16387700
申请日：2019-04-18
Applicant: NITTOH INC.
Inventor： Takahiko Matsuo
IPC: G03B21/28 , G02B13/16 , G02B13/18 , G02B13/22 , G02B15/16 , G02B15/20 , G02B17/08 , G02B15/15 , G03B21/14 , H04N9/31 , G02B15/163
Abstract: 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).
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公开(公告)号：US10375363B2
公开(公告)日：2019-08-06
申请号：US16044982
申请日：2018-07-25
Applicant: NITTOH INC.
Inventor： Takahiko Matsuo
Abstract: 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).
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Patent Agency Ranking
公开(公告)号：US10884326B2
公开(公告)日：2021-01-05
申请号：US16471580
申请日：2017-12-21
Applicant: NITTOH INC.
Inventor： Masashi Yoshida , Takahiko Matsuo
Abstract: 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.
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公开(公告)号：US10754120B2
公开(公告)日：2020-08-25
申请号：US16252995
申请日：2019-01-21
Applicant: Nittoh Inc.
Inventor： Takafumi Hanaoka , Takahiko Matsuo , Takuya Fujimatsu
Abstract: 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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公开(公告)号：US10222576B2
公开(公告)日：2019-03-05
申请号：US15519467
申请日：2015-08-27
Applicant: NITTOH INC.
Inventor： Takafumi Hanaoka , Takahiko Matsuo , Takuya Fujimatsu
Abstract: 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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公开(公告)号：US11720007B2
公开(公告)日：2023-08-08
申请号：US17257359
申请日：2019-06-25
Applicant: Nittoh Inc.
Inventor： Takahiko Matsuo
CPC classification number: G03B21/142 , G02B13/18
Abstract: In a projection optical system for projecting an optical image from a first image plane on a reduction side onto a second image plane on a magnification side, the system includes an achromatic lens including a positive lens and a negative lens separately arranged in this order from the reduction side toward the magnification side, and the negative lens having a refractive index of 1.7 or higher and an Abbe's number of 55 or less satisfies the following expression:
3.5≤|R|/|f| (1),
where the radius of curvature of a light incident surface is R and the focal length of an entire projection optical system is f.-
公开(公告)号：US10063819B2
公开(公告)日：2018-08-28
申请号：US15522120
申请日：2015-10-30
Applicant: NITTOH INC.
Inventor： Takahiko Matsuo
CPC classification number: H04N9/315 , G02B13/16 , G02B15/20 , G02B17/08 , G02B17/0852 , G03B21/00 , G03B21/14 , G03B21/147 , G03B21/28 , H04N9/3141
Abstract: 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).
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