WO2021230218A1 - レンズシステムおよびプロジェクタ - Google Patents

レンズシステムおよびプロジェクタ Download PDF

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Publication number
WO2021230218A1
WO2021230218A1 PCT/JP2021/017790 JP2021017790W WO2021230218A1 WO 2021230218 A1 WO2021230218 A1 WO 2021230218A1 JP 2021017790 W JP2021017790 W JP 2021017790W WO 2021230218 A1 WO2021230218 A1 WO 2021230218A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
lens group
lens system
face
wide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/017790
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
恵一 望月
悠哉 宮下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nittoh Inc
Original Assignee
Nittoh Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nittoh Inc filed Critical Nittoh Inc
Priority to US17/924,001 priority Critical patent/US20230273413A1/en
Priority to JP2022521916A priority patent/JPWO2021230218A1/ja
Publication of WO2021230218A1 publication Critical patent/WO2021230218A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
    • G02B15/1421—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only the first group being positive
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
    • G02B15/1425—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only the first group being negative
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
    • G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
    • G02B15/143507—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -++
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
    • G03B3/10—Power-operated focusing

Definitions

  • FIG. 2 shows the data of each lens constituting the lens system 10.
  • the refractive index r is the radius of curvature (mm) of each surface S of each lens arranged in order from the magnifying side 3, the interval d is the distance (mm) between each lens surface, and the effective diameter D is the effective diameter (diameter) of each lens surface.
  • Mm the refractive index
  • n indicates the refractive index (d line) of each lens
  • the Abbe number ( ⁇ ) indicates the Abbe number (d line) of each lens.
  • the end face S4 of the magnifying side 3 of the second lens group G2 is guided to diffuse the light beam toward the optical axis 7 from the first end face S2 having a large diameter of the magnifying side 3 (direction spreading from the optical axis 7).
  • a concave surface having a relatively small radius of curvature and suitable for diverging light rays can be introduced into the lens system 10 as a second end surface S4.
  • the concave surface S4 on the magnifying side 3 having a small radius of curvature the Petzval sum of the lens system 10 can be reduced. Therefore, the imaging ability can be improved by improving the aberration correction ability of the lens system 10.
  • the magnifying side 3 of the second lens group G2 is provided with a diaphragm that moves together with the second lens group G2 and defines the effective diameter of the second end surface of the most magnifying side 3 of the second lens group G2. May be good.
  • the second end face S4 of the magnifying side 3 of the lens L2 of the most magnifying side 3 of the second lens group G2 also serves as a diaphragm.
  • the second end surface S4 is a concave surface on the magnifying side 3, and the first end surface S2 of the most reducing side 2 of the first lens group G1 is made a convex surface on the reducing side 2.
  • the bending angle of the light rays on the end face S4 can be set large, and the light rays passing through the second end face S4 can be narrowed down.
  • the lens system 10 includes a focal length ft at the telephoto end of the entire system, a focal length fw at the wide-angle end of the entire system, a focal length f1 of the first lens group G1, and a focal length f2 of the second lens group G2. May satisfy the following conditions (1) and (2). 1 ⁇ f1 / ft ⁇ 1.4 ... (1) 1 ⁇ f2 / fw ⁇ 1.4 ... (2) In the positive-positive zoom lens system 10, the power of the second lens group G2 on the reduction side 2 is designed to be stronger than the power of the first lens group G1 on the enlargement side 3.
  • the focal length f1 of the first lens group G1 and the focal length f2 of the second lens group G2 may satisfy the following condition (3). 1.5 ⁇ f1 / f2 ⁇ 2.5 ... (3)
  • the lower limit of the condition (3) When the lower limit of the condition (3) is exceeded, the power ratio between the first lens group G1 and the second lens group G2 is too small, and the moving distance during zooming becomes too large, so that the lens system 10 is compactly integrated. It becomes difficult, and it becomes difficult to secure the brightness.
  • the upper limit of the condition (3) is exceeded, the power of the second lens group G2 becomes extremely large, it becomes difficult to correct the aberration in cooperation with the first lens group G1, and the imaging performance is improved. descend.
  • the abbreviation number ⁇ dt of all the positive lenses included in the whole system of the lens system 10 and the abbreviation number ⁇ dn of all the negative lenses included in the whole system satisfy the following conditions (10) and (11). You may. 35 ⁇ dp ⁇ 85 (10) 20 ⁇ dn ⁇ 40 (11)
  • the lens system 10 shown in FIG. 1 has a first lens group G1 composed of a positive power lens L1 arranged along the optical axis 7, and a negative lens system 10 arranged in order from the magnifying side 3. It includes a second lens group G2 composed of three lenses L2 to L4 having positive-positive power.
  • the lens L1 constituting the first lens group G1 is a biconvex positive lens, and the radius of curvature r1 of the surface S1 on the enlargement side 3 is smaller than the radius of curvature r2 of the surface S2 on the reduction side 2 (in absolute value).
  • the aperture ST is arranged adjacent to the surface S2 on the reduction side 2 of the lens L1.
  • the lens system 10 shown in FIG. 1 satisfies all of the conditions (1) to (11), and is a compact zoom lens system having a configuration of 4 elements in 2 groups, but has a zoom ratio. It is a zoom lens system that can project a clear image with an F value of 2.0, which is almost constant at the telephoto end and the wide-angle end.
  • FIG. 8 shows a different example of the projector 1.
  • FIG. 8A shows the lens arrangement of the lens system 10 at the telephoto end
  • FIG. 8B shows the lens arrangement of the lens system 10 at the wide-angle end.
  • the projector 1 also includes a lens system 10 and an image forming device 5 arranged on the conjugate surface of the reduction side 2.
  • the projector 1 further includes a lens system 10 and a lens unit 21 including a first lens group G1, a second lens group G2, and a drive unit 20 capable of controlling the position of at least one of the devices 5.
  • the lens system 10 is a zoom lens system for a projector, and is a lens system having four elements in two groups as in the above example.
  • FIG. 11 shows various numerical values at the telephoto end and the wide-angle end of the lens system 10
  • FIG. 12 shows spherical aberration, astigmatism, and distortion of the lens system 10
  • FIGS. 13 and 14 show the lens system 10 It shows lateral aberration.
  • 12 (a) and 13 show various aberrations at the telephoto end
  • FIGS. 12 (b) and 14 show various aberrations at the wide-angle end.
  • the numerical values of the lens system 10 and the values of each condition are as follows.
  • the lens system 10 shown in FIG. 8 also satisfies all of the conditions (1) to (11).
  • the lens system 10 is a compact zoom lens system composed of 4 elements in 2 groups, has a zoom ratio of 2.0, and can project a bright and clear image with an F value of almost constant at the telephoto end and the wide-angle end.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)
PCT/JP2021/017790 2020-05-12 2021-05-11 レンズシステムおよびプロジェクタ Ceased WO2021230218A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US17/924,001 US20230273413A1 (en) 2020-05-12 2021-05-11 Lens system and projector
JP2022521916A JPWO2021230218A1 (https=) 2020-05-12 2021-05-11

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-083811 2020-05-12
JP2020083811 2020-05-12

Publications (1)

Publication Number Publication Date
WO2021230218A1 true WO2021230218A1 (ja) 2021-11-18

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ID=78524531

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/017790 Ceased WO2021230218A1 (ja) 2020-05-12 2021-05-11 レンズシステムおよびプロジェクタ

Country Status (3)

Country Link
US (1) US20230273413A1 (https=)
JP (1) JPWO2021230218A1 (https=)
WO (1) WO2021230218A1 (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2024541530A (ja) * 2021-11-25 2024-11-08 ヴァレオ ビジョン ３つのレンズを備えた光学投射装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0511184A (ja) * 1991-04-19 1993-01-19 Olympus Optical Co Ltd 大口径変倍レンズ
JPH1195101A (ja) * 1997-09-22 1999-04-09 Minolta Co Ltd ズームレンズ
JP2010134416A (ja) * 2008-11-04 2010-06-17 Hoya Corp リアフォーカス広角レンズ系及びそれを用いた電子撮像装置
JP2010266577A (ja) * 2009-05-13 2010-11-25 Canon Inc 光学系及びそれを有する光学機器
JP2011013469A (ja) * 2009-07-02 2011-01-20 Canon Inc 光学系及びそれを有する光学機器
JP2011053663A (ja) * 2009-08-04 2011-03-17 Konica Minolta Opto Inc 光学系及びそれを備えた画像投影装置及び撮像装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69726352T2 (de) * 1996-08-16 2004-09-09 3M Innovative Properties Co., St. Paul Miniaturprojektionszoomobjektiv zur Verwendung mit Anzeigetafel mit Pixelmatrix
WO2013171995A1 (ja) * 2012-05-16 2013-11-21 富士フイルム株式会社 投写用変倍光学系および投写型表示装置
JP6004840B2 (ja) * 2012-08-29 2016-10-12 キヤノン株式会社 ズームレンズ及びそれを有する撮像装置
JP6570239B2 (ja) * 2014-11-19 2019-09-04 キヤノン株式会社 光学系、及びそれを有する光学機器
JP6604090B2 (ja) * 2015-08-27 2019-11-13 株式会社リコー 投射光学系および投射装置および投射システム

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0511184A (ja) * 1991-04-19 1993-01-19 Olympus Optical Co Ltd 大口径変倍レンズ
JPH1195101A (ja) * 1997-09-22 1999-04-09 Minolta Co Ltd ズームレンズ
JP2010134416A (ja) * 2008-11-04 2010-06-17 Hoya Corp リアフォーカス広角レンズ系及びそれを用いた電子撮像装置
JP2010266577A (ja) * 2009-05-13 2010-11-25 Canon Inc 光学系及びそれを有する光学機器
JP2011013469A (ja) * 2009-07-02 2011-01-20 Canon Inc 光学系及びそれを有する光学機器
JP2011053663A (ja) * 2009-08-04 2011-03-17 Konica Minolta Opto Inc 光学系及びそれを備えた画像投影装置及び撮像装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2024541530A (ja) * 2021-11-25 2024-11-08 ヴァレオ ビジョン ３つのレンズを備えた光学投射装置

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US20230273413A1 (en) 2023-08-31
JPWO2021230218A1 (https=) 2021-11-18

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