WO2021171713A1 - 光学系、画像投写装置および撮像装置 - Google Patents

光学系、画像投写装置および撮像装置 Download PDF

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Publication number
WO2021171713A1
WO2021171713A1 PCT/JP2020/042935 JP2020042935W WO2021171713A1 WO 2021171713 A1 WO2021171713 A1 WO 2021171713A1 JP 2020042935 W JP2020042935 W JP 2020042935W WO 2021171713 A1 WO2021171713 A1 WO 2021171713A1
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WIPO (PCT)
Prior art keywords
optical system
lens
magnifying
lens element
group
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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/JP2020/042935
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English (en)
French (fr)
Japanese (ja)
Inventor
卓也 今岡
慶華 趙
克 山田
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.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
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Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to JP2022503093A priority Critical patent/JP7664544B2/ja
Priority to CN202080097408.9A priority patent/CN115176188A/zh
Publication of WO2021171713A1 publication Critical patent/WO2021171713A1/ja
Priority to US17/821,231 priority patent/US12422655B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • G02B15/22—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 movable lens means specially adapted for focusing at close distances
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/0095—Relay lenses or rod lenses
    • 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
    • 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
    • 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
    • G02B15/146—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 more than five groups
    • G02B15/1461—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 more than five groups the first group being positive

Definitions

  • the present disclosure relates to an optical system that forms an intermediate image.
  • the present disclosure also relates to an image projection device and an image pickup device using such an optical system.
  • the intermediate imaging type optical system has the advantage of being able to realize wide-angle projection of a large screen with a short focus, but the overall length of the optical system tends to be large. Therefore, the optical system becomes heavy, and when a part of the optical system is mounted outside the housing of the image projection device main body, the optical system is tilted with respect to the device main body due to the moment acting on the center of gravity, and the optical performance may deteriorate. There is sex.
  • Synthetic resin has a lower specific gravity than glass, but has lower thermal conductivity and a higher coefficient of linear expansion. Therefore, although the weight of the optical system can be reduced, optical aberration, particularly chromatic aberration, tends to increase due to local temperature rise and thermal deformation. This tendency becomes particularly remarkable in the case of high-luminance projection.
  • Patent Document 1 discloses a wide-angle imaging optical system, and the first lens L1a closest to the magnifying conjugate point has the largest aperture. Since the first lens L1a has aspherical surfaces on both sides and has a considerably complicated shape, it is presumed that a synthetic resin lens is used. However, it is expected that such a complicated aspherical shape becomes considerably sensitive to thermal deformation, and the deterioration of optical aberration due to temperature rise becomes remarkable.
  • the present disclosure provides an optical system capable of reducing the moment acting on the center of gravity and reducing the influence of heat.
  • the present disclosure also provides an image projection device and an image pickup device using such an optical system.
  • One aspect of the present disclosure is an optical system having an intermediate imaging position that is conjugate to the enlargement conjugate point on the enlargement side and the reduction conjugate point on the reduction side, respectively.
  • a magnifying optical system located on the magnifying side of the intermediate imaging position A relay optical system located on the reduction side from the intermediate imaging position is provided.
  • the relay optical system The first lens group on the most magnified side, Two lens groups on the reduction side of the first lens group, It has a negative lens group arranged between two lens groups, This is an optical system in which two lens groups move while the negative lens group is fixed during zooming.
  • the image projection device includes the above optical system and an image forming element that generates an image projected on a screen via the optical system.
  • the image pickup apparatus includes the above optical system and an image pickup element that receives an optical image formed by the optical system and converts it into an electrical image signal.
  • the moment acting on the center of gravity can be reduced, and the influence of heat can be reduced. Therefore, stable optical performance can be maintained when high-intensity light passes through the lens, for example, in the case of high-luminance projection.
  • Layout of the wide-angle end of the zoom lens of Example 1 at an object distance of 1065.7157 mm Schematic of longitudinal aberration at an object distance of 1065.7157 mm of the zoom lens of Example 1.
  • FIG. 6 is a longitudinal aberration diagram of the zoom lens of Example 2 at an object distance of 1065.7157 mm.
  • FIG. 6 is a longitudinal aberration diagram of the zoom lens of Example 3 at an object distance of 1065.7157 mm.
  • FIG. 6 is a longitudinal aberration diagram of the zoom lens of Example 4 at an object distance of 1065.7157 mm.
  • FIG. 6 is a longitudinal aberration diagram of the zoom lens of Example 5 at an object distance of 1065.7157 mm.
  • FIG. 6 is a longitudinal aberration diagram of the zoom lens of Example 7 at an object distance of 1065.7157 mm.
  • the optical system projects the image light of the original image S, in which the incident light is spatially modulated by an image forming element such as a liquid crystal display or a DMD (Digital Micromirror Device) based on the image signal, onto the screen (image projection).
  • an image forming element such as a liquid crystal display or a DMD (Digital Micromirror Device)
  • the optical system according to the present disclosure can be used for arranging a screen (not shown) on the extension line on the enlargement side and enlarging the original image S on the image forming element arranged on the reduction side and projecting it on the screen.
  • the optical system according to the present disclosure is for collecting light emitted from an object located on an extension line on the enlargement side and forming an optical image of the object on the image pickup surface of an image pickup device arranged on the reduction side. Is also available.
  • FIG. 1, FIG. 4, FIG. 7, FIG. 10, FIG. 13, and FIG. 16 are layout drawings showing an optical path at a wide-angle end at an object distance of 1065.7157 mm of the zoom lens system according to the first to sixth embodiments.
  • FIG. 5, FIG. 8, FIG. 11, FIG. 14, and FIG. 17 are layouts of wide-angle ends of the zoom lens system according to the first to sixth embodiments at an object distance of 1065.7157 mm.
  • 2 (a), 5 (a), 8 (a), 11 (a), 14 (a), and 17 (a) show a lens arrangement diagram at the wide-angle end of the zoom lens system.
  • 2 (b), 5 (b), 8 (b), 11 (b), 14 (b), and 17 (b) show a lens arrangement diagram at an intermediate position of the zoom lens system.
  • 2 (c), 5 (c), 8 (c), 11 (c), 14 (c), and 17 (c) show a lens arrangement diagram at the telephoto end of the zoom lens system.
  • the wide-angle end is the shortest focal length state in which the entire system has the shortest focal length fw.
  • the intermediate position is the intermediate focal length state between the wide-angle end and the telephoto end.
  • the zoom lens system according to the first embodiment includes a magnifying optical system Op, a relay optical system Ol, and an optical element P, and the relay optical system Ol includes a first lens group G1 to a fourth lens group G4.
  • the magnifying optical system Op is composed of the first lens element L1 to the twelfth lens element L12, and includes surfaces 1 to 24 (see numerical examples described later).
  • the relay optical system Ol is composed of the 13th lens element L13 to the 25th lens element L25, and includes surfaces 25 to 51.
  • the first lens group G1 has a positive power, is composed of the thirteenth lens element L13 to the fifteenth lens element L15, and includes surfaces 25 to 30.
  • the second lens group G2 has a positive power, is composed of the 16th lens element L16 to the 18th lens element L18, and includes the surfaces 31 to 36.
  • the third lens group G3 has a negative power, is composed of the 19th lens element L19 to the 22nd lens element L22, and includes surfaces 37 to 45.
  • the fourth lens group G4 has a positive power, is composed of the 23rd lens element L23 to the 25th lens element L25, and includes surfaces 46 to 51.
  • the optical element P includes surfaces 52 to 53.
  • the zoom lens system according to the second embodiment includes a magnifying optical system Op, a relay optical system Ol, and an optical element P, and the relay optical system Ol includes a first lens group G1 to a fourth lens group G4.
  • the magnifying optical system Op is composed of the first lens element L1 to the twelfth lens element L12, and includes surfaces 1 to 24 (see numerical examples described later).
  • the relay optical system Ol is composed of the 13th lens element L13 to the 25th lens element L25, and includes surfaces 25 to 51.
  • the first lens group G1 has a positive power, is composed of the thirteenth lens element L13 to the fifteenth lens element L15, and includes surfaces 25 to 30.
  • the second lens group G2 has a positive power, is composed of the 16th lens element L16 to the 18th lens element L18, and includes the surfaces 31 to 36.
  • the third lens group G3 has a negative power, is composed of the 19th lens element L19 to the 22nd lens element L22, and includes surfaces 37 to 45.
  • the fourth lens group G4 has a positive power, is composed of the 23rd lens element L23, and includes surfaces 46 to 47.
  • the fifth lens group G5 has a positive power, is composed of the 24th lens element L24 and the 25th lens element L25 to the 25th lens element L25, and includes surfaces 48 to 51.
  • the optical element P includes surfaces 52 to 53.
  • the zoom lens system according to the third embodiment includes a magnifying optical system Op, a relay optical system Ol, and an optical element P, and the relay optical system Ol includes a first lens group G1 to a fourth lens group G4.
  • the magnifying optical system Op is composed of the first lens element L1 to the twelfth lens element L12, and includes surfaces 1 to 24 (see numerical examples described later).
  • the relay optical system Ol is composed of the 13th lens element L13 to the 25th lens element L25, and includes surfaces 25 to 51.
  • the first lens group G1 has a positive power, is composed of the thirteenth lens element L13 to the fifteenth lens element L15, and includes surfaces 25 to 30.
  • the second lens group G2 has a positive power, is composed of the 16th lens element L16 to the 18th lens element L18, and includes the surfaces 31 to 36.
  • the third lens group G3 has a negative power, is composed of the 19th lens element L19 to the 22nd lens element L22, and includes surfaces 37 to 45.
  • the fourth lens group G4 has a positive power, is composed of the 23rd lens element L23, and includes surfaces 46 to 47.
  • the fifth lens group G5 has a negative power, is composed of the 24th lens element L24, and includes surfaces 48 to 49.
  • the sixth lens group G6 has a positive power, is composed of the 25th lens element L2, and includes surfaces 50 to 51.
  • the optical element P includes surfaces 52 to 53.
  • the zoom lens system according to the fourth embodiment includes a magnifying optical system Op, a relay optical system Ol, and an optical element P, and the relay optical system Ol includes a first lens group G1 to a fourth lens group G4.
  • the magnifying optical system Op is composed of the first lens element L1 to the twelfth lens element L12, and includes surfaces 1 to 24 (see numerical examples described later).
  • the relay optical system Ol is composed of the 13th lens element L13 to the 25th lens element L25, and includes surfaces 25 to 51.
  • the first lens group G1 has a positive power, is composed of the thirteenth lens element L13 to the fifteenth lens element L15, and includes surfaces 25 to 30.
  • the second lens group G2 has a positive power, is composed of the 16th lens element L16 to the 17th lens element L17, and includes surfaces 31 to 34.
  • the third lens group G3 has a positive power, is composed of the 18th lens element L18, and includes surfaces 35 to 36.
  • the fourth lens group G4 has a negative power, is composed of the 19th lens element L19 to the 22nd lens element L22, and includes surfaces 37 to 45.
  • the fifth lens group G4 has a positive power, is composed of the 23rd lens element L23, and includes surfaces 46 to 47.
  • the sixth lens group G6 has a positive power, is composed of the 24th lens element L25, and includes surfaces 48 to 51.
  • the optical element P includes surfaces 52 to 53.
  • the zoom lens system according to the fifth embodiment includes a magnifying optical system Op, a relay optical system Ol, and an optical element P, and the relay optical system O1 includes a first lens group G1 to an eighth lens group G8.
  • the magnifying optical system Op is composed of the first lens element L1 to the twelfth lens element L12, and includes surfaces 1 to 24 (see numerical examples described later).
  • the relay optical system Ol is composed of the 13th lens element L13 to the 25th lens element L25, and includes surfaces 25 to 51.
  • the first lens group G1 has a positive power, is composed of the thirteenth lens element L13 to the fifteenth lens element L15, and includes surfaces 25 to 30.
  • the second lens group G2 has a positive power, is composed of the 16th lens element L16, and includes surfaces 31 to 32.
  • the third lens group G3 has a negative power, is composed of the 17th lens element L17, and includes surfaces 33 to 34.
  • the fourth lens group G4 has a positive power, is composed of the 18th lens element L18, and includes surfaces 35 to 36.
  • the fifth lens group G5 has a negative power, is composed of the 19th lens element L19 to the 22nd lens element L22, and includes surfaces 37 to 45.
  • the sixth lens group G6 has a positive power, is composed of the 23rd lens element L23, and includes surfaces 46 to 47.
  • the seventh lens group G7 has a negative power, is composed of the 24th lens element, and includes surfaces 48 to 49.
  • the eighth lens group G8 has a positive power and is composed of the 25th lens element L25, and includes surfaces 50 to 51.
  • the optical element P includes surfaces 52 to 53.
  • the zoom lens system according to the sixth embodiment includes a magnifying optical system Op, a relay optical system Ol, and an optical element P, and the relay optical system O1 includes a first lens group G1 to an eighth lens group G8.
  • the magnifying optical system Op is composed of the first lens element L1 to the twelfth lens element L12, and includes surfaces 1 to 24 (see numerical examples described later).
  • the relay optical system Ol is composed of the 13th lens element L13 to the 25th lens element L25, and includes surfaces 25 to 51.
  • the first lens group G1 has a negative power, is composed of the thirteenth lens element L13 to the fifteenth lens element L15, and includes surfaces 25 to 30.
  • the second lens group G2 has a positive power, is composed of the 16th lens element L16 to the 18th lens element L18, and includes the surfaces 31 to 36.
  • the third lens group G3 has a positive power, is composed of the 19th lens element L19, and includes surfaces 37 to 38.
  • the fourth lens group G4 has a negative power, is composed of an aperture and a 20th lens element L20, and includes surfaces 39 to 41.
  • the fifth lens group G5 has a negative power, is composed of the 21st lens element L21 to the 22nd lens element L22, and includes surfaces 42 to 45.
  • the sixth lens group G6 has a positive power, is composed of the 23rd lens element L23 to the 25th lens element L25, and includes surfaces 46 to 51.
  • the optical element P includes surfaces 52 to 53.
  • the polygonal line arrows shown between each figure (a) and each figure (b) of FIGS. 2, 5, 8, 11, 14, and 17 are the wide-angle ends in order from the top in the figure. It is a straight line obtained by connecting the positions of the first lens group G1 to the eighth lens group G8 in each state of the intermediate position and the telephoto end. The wide-angle end and the intermediate position, and the intermediate position and the telephoto end are simply connected by a straight line, which is different from the actual movement of each lens group G1 to G8.
  • the symbols (+) and (-) attached to the symbols of the respective lens groups G1 to G8 indicate the positive and negative of the power of the respective lens groups G1 to G8.
  • a focusing adjustment lens group that adjusts the focus when the object distance changes, and a field curvature aberration after the focusing adjustment lens group adjusts the focus. It may include a group of image plane curvature correction lenses for correcting the above.
  • the image formation position on the enlargement side (that is, the enlargement conjugate point) is located on the left side
  • the image formation position on the reduction side that is, the reduction conjugate point
  • the straight line described on the most reduced side represents the position of the original image S
  • the optical element P is located on the enlarged side of the original image S.
  • the optical element P represents an optical element such as a prism for color separation and color synthesis, an optical filter, parallel flat glass, a crystal low-pass filter, and an infrared cut filter.
  • the zoom lens system according to Examples 1 to 6 has an intermediate imaging position MI that is conjugate to the enlargement conjugate point on the enlargement side and the reduction conjugate point on the reduction side, respectively. Further, in each figure, the magnifying optical system Op is arranged on the enlargement side of the intermediate image formation position MI, and the relay optical system Ol is arranged on the reduction side of the intermediate image formation position MI.
  • the magnifying optics Op has the longest air spacing along the optical axis in the magnifying optics. For example, as shown in FIGS. 2, 5, 8, 11, 14, and 17, there is the longest air gap between the ninth lens element L9 and the tenth lens element L10.
  • the magnifying optical system Op includes a front group Opf located on the expanding side of the longest air spacing and a rear group Opr located on the contracting side of the longest air spacing.
  • the front group Opf and the rear group Opr may have a single or multiple lens elements.
  • FIG. 6, FIG. 9, FIG. 12, FIG. 15, and FIG. 18 are longitudinal aberration diagrams at an object distance of 1065.7157 mm of the zoom lens system according to the first to sixth embodiments.
  • (A), (b), and (c) in each figure show longitudinal aberration diagrams at the wide-angle end, the intermediate position, and the telephoto end of the zoom lens system.
  • Each longitudinal aberration diagram shows spherical aberration (SA (mm)), astigmatism (AST (mm)), and distortion (DIS (%)) in order from the left side.
  • the vertical axis represents the height of the pupil
  • the solid line is the d-line
  • the short dashed line is the F-line
  • the long dashed line is the C-line. ..
  • the vertical axis represents the image height
  • the solid line is the characteristic of the sagittal plane (indicated by s in the figure)
  • the broken line is the characteristic of the meridional plane (indicated by m in the figure).
  • the vertical axis represents the image height. Distortion represents distortion for equidistant projection.
  • the zoom lens system according to the first embodiment includes a magnifying optical system Op and a relay optical system Ol.
  • the magnifying optical system Op is composed of the first lens element L1 to the twelfth lens element L12.
  • the magnifying optics Op includes a front group Opf and a rear group Opr.
  • the front group Opf of the magnifying optical system Op is composed of the first lens element L1 to the ninth lens element L9 in order from the magnifying side to the reducing side.
  • the first lens element L1 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the second lens element L2 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the third lens element L3 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the fourth lens element L4 has a positive meniscus shape with a convex surface facing the reduction side.
  • the fifth lens element L5 has a positive meniscus shape with a convex surface facing the reduction side.
  • the sixth lens element L6 has a positive meniscus shape with a convex surface facing the reduction side.
  • the seventh lens element L7 has a negative meniscus shape with a convex surface facing the reduction side.
  • the eighth lens element L8 has a positive meniscus shape with a convex surface facing the reduction side.
  • the ninth lens element L9 has a positive meniscus shape with a convex surface facing the reduction side.
  • the rear group Opr of the magnifying optical system Op is composed of the tenth lens element L10 to the twelfth lens element L12 in order from the magnifying side to the reducing side.
  • the tenth lens element L10 has a biconvex shape.
  • the eleventh lens element L11 has a positive meniscus shape with a convex surface facing the magnifying side.
  • the twelfth lens element L12 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the relay optical system Ol is composed of the 13th lens element L13 to the 25th lens element L25 in order from the enlargement side to the reduction side.
  • the thirteenth lens element L13 has a positive meniscus shape with a convex surface facing the reduction side.
  • the 14th lens element L14 has a biconcave shape.
  • the fifteenth lens element L15 has a positive meniscus shape with a convex surface facing the reduction side.
  • the 16th lens element L16 has a biconvex shape.
  • the 17th lens element L17 has a negative meniscus shape with a convex surface facing the reduction side.
  • the 18th lens element L18 has a biconvex shape.
  • the 19th lens element L19 has a positive meniscus shape with a convex surface facing the magnifying side.
  • the 20th lens element L20 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the 21st lens element L21 has a biconcave shape.
  • the 22nd lens element L22 has a biconvex shape.
  • the 23rd lens element L23 has a biconvex shape.
  • the 24th lens element L24 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the 25th lens element L25 has a biconvex shape.
  • the relay optical system Ol has a first lens group (L13 to L15) having a positive power, a second lens group (L16 to L18) having a positive power, and a negative power in order from the enlargement side to the reduction side. It consists of a third lens group (L19 to L22) and a fourth lens group (L23 to L25) having positive power.
  • the first lens group and the third lens group are fixed, and the second lens group and the fourth lens group are displaced along the optical axis, and when zooming from the wide-angle end to the telephoto end, the second lens is used.
  • the group and the fourth lens group are displaced to the magnifying side.
  • the relay optical system Ol has a first lens group (example of the first lens group) having positive power on the enlargement side, and a second lens group and a fourth lens group (example of two lens groups) on the reduction side. ), And the second lens group and the fourth lens group are on the magnifying side while the third lens group is fixed during zooming. Move to.
  • the zoom lens system according to the second embodiment includes a magnifying optical system Op and a relay optical system Ol.
  • the magnifying optical system Op is composed of the first lens element L1 to the twelfth lens element L12.
  • the magnifying optics Op includes a front group Opf and a rear group Opr.
  • the front group Opf of the magnifying optical system Op is composed of the first lens element L1 to the ninth lens element L9 in order from the magnifying side to the reducing side.
  • the first lens element L1 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the second lens element L2 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the third lens element L3 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the fourth lens element L4 has a positive meniscus shape with a convex surface facing the reduction side.
  • the fifth lens element L5 has a positive meniscus shape with a convex surface facing the reduction side.
  • the sixth lens element L6 has a positive meniscus shape with a convex surface facing the reduction side.
  • the seventh lens element L7 has a negative meniscus shape with a convex surface facing the reduction side.
  • the eighth lens element L8 has a positive meniscus shape with a convex surface facing the reduction side.
  • the ninth lens element L9 has a positive meniscus shape with a convex surface facing the reduction side.
  • the rear group Opr of the magnifying optical system Op is composed of the tenth lens element L10 to the twelfth lens element L12 in order from the magnifying side to the reducing side.
  • the tenth lens element L10 has a biconvex shape.
  • the eleventh lens element L11 has a positive meniscus shape with a convex surface facing the magnifying side.
  • the twelfth lens element L12 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the relay optical system Ol is composed of the 13th lens element L13 to the 25th lens element L25 in order from the enlargement side to the reduction side.
  • the thirteenth lens element L13 has a positive meniscus shape with a convex surface facing the reduction side.
  • the 14th lens element L14 has a biconcave shape.
  • the fifteenth lens element L15 has a positive meniscus shape with a convex surface facing the reduction side.
  • the 16th lens element L16 has a biconvex shape.
  • the 17th lens element L17 has a negative meniscus shape with a convex surface facing the reduction side.
  • the 18th lens element L18 has a biconvex shape.
  • the 19th lens element L19 has a positive meniscus shape with a convex surface facing the magnifying side.
  • the 20th lens element L20 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the 21st lens element L21 has a biconcave shape.
  • the 22nd lens element L22 has a biconvex shape.
  • the 23rd lens element L23 has a biconvex shape.
  • the 24th lens element L24 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the 25th lens element L25 has a biconvex shape.
  • the relay optical system Ol has a first lens group (L13 to L15) having a positive power, a second lens group (L16 to L18) having a positive power, and a negative power in order from the enlargement side to the reduction side. It consists of a third lens group (L19 to L22), a fourth lens group (L23) having a positive power, and a fifth lens group (L24 to L25) having a positive power.
  • the first lens group, the third lens group, and the fifth lens group are fixed, and the second lens group and the fourth lens group are displaced along the optical axis, and when zooming from the wide-angle end to the telescopic end.
  • the second lens group and the fourth lens group are displaced to the magnifying side.
  • the relay optical system Ol has a first lens group (example of the first lens group) having positive power on the enlargement side, and a second lens group and a fourth lens group (example of two lens groups) on the reduction side. ), And the second lens group and the fourth lens group are on the magnifying side while the third lens group is fixed during zooming. Move to.
  • the zoom lens system according to the third embodiment includes a magnifying optical system Op and a relay optical system Ol.
  • the magnifying optical system Op is composed of the first lens element L1 to the twelfth lens element L12.
  • the magnifying optics Op includes a front group Opf and a rear group Opr.
  • the front group Opf of the magnifying optical system Op is composed of the first lens element L1 to the ninth lens element L9 in order from the magnifying side to the reducing side.
  • the first lens element L1 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the second lens element L2 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the third lens element L3 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the fourth lens element L4 has a positive meniscus shape with a convex surface facing the reduction side.
  • the fifth lens element L5 has a positive meniscus shape with a convex surface facing the reduction side.
  • the sixth lens element L6 has a positive meniscus shape with a convex surface facing the reduction side.
  • the seventh lens element L7 has a negative meniscus shape with a convex surface facing the reduction side.
  • the eighth lens element L8 has a positive meniscus shape with a convex surface facing the reduction side.
  • the ninth lens element L9 has a positive meniscus shape with a convex surface facing the reduction side.
  • the rear group Opr of the magnifying optical system Op is composed of the tenth lens element L10 to the twelfth lens element L12 in order from the magnifying side to the reducing side.
  • the tenth lens element L10 has a biconvex shape.
  • the eleventh lens element L11 has a positive meniscus shape with a convex surface facing the magnifying side.
  • the twelfth lens element L12 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the relay optical system Ol is composed of the 13th lens element L13 to the 25th lens element L25 in order from the enlargement side to the reduction side.
  • the thirteenth lens element L13 has a positive meniscus shape with a convex surface facing the reduction side.
  • the 14th lens element L14 has a biconcave shape.
  • the fifteenth lens element L15 has a positive meniscus shape with a convex surface facing the reduction side.
  • the 16th lens element L16 has a biconvex shape.
  • the 17th lens element L17 has a negative meniscus shape with a convex surface facing the reduction side.
  • the 18th lens element L18 has a biconvex shape.
  • the 19th lens element L19 has a positive meniscus shape with a convex surface facing the magnifying side.
  • the 20th lens element L20 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the 21st lens element L21 has a biconcave shape.
  • the 22nd lens element L22 has a biconvex shape.
  • the 23rd lens element L23 has a biconvex shape.
  • the 24th lens element L24 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the 25th lens element L25 has a biconvex shape.
  • the relay optical system Ol has a first lens group (L13 to L15) having a positive power, a second lens group (L16 to L18) having a positive power, and a negative power in order from the enlargement side to the reduction side. It consists of a third lens group (L19 to L22), a fourth lens group (L23) having a positive power, a fifth lens group (L24) having a negative power, and a sixth lens group (L25) having a positive power. ..
  • the 1st lens group, the 3rd lens group, and the 6th lens group are fixed, and the 2nd lens group, the 4th lens group, and the 5th lens group are displaced along the optical axis, and are telescopic from the wide-angle end.
  • the second lens group, the fourth lens group, and the fifth lens group are displaced toward the magnifying side.
  • the relay optical system Ol has a first lens group (example of the first lens group) having positive power on the enlargement side, and a second lens group and a fourth lens group (example of two lens groups) on the reduction side. ), And the second lens group and the fourth lens group are on the magnifying side while the third lens group is fixed during zooming. Move to.
  • the relay optical system Ol further has a fifth lens group (an example of another negative lens group), and the third lens group has a smaller negative power than the fifth lens group.
  • the zoom lens system according to the fourth embodiment includes a magnifying optical system Op and a relay optical system Ol.
  • the magnifying optical system Op is composed of the first lens element L1 to the twelfth lens element L12.
  • the magnifying optics Op includes a front group Opf and a rear group Opr.
  • the front group Opf of the magnifying optical system Op is composed of the first lens element L1 to the ninth lens element L9 in order from the magnifying side to the reducing side.
  • the first lens element L1 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the second lens element L2 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the third lens element L3 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the fourth lens element L4 has a positive meniscus shape with a convex surface facing the reduction side.
  • the fifth lens element L5 has a positive meniscus shape with a convex surface facing the reduction side.
  • the sixth lens element L6 has a positive meniscus shape with a convex surface facing the reduction side.
  • the seventh lens element L7 has a biconcave shape.
  • the eighth lens element L8 has a biconvex shape.
  • the ninth lens element L9 has a positive meniscus shape with a convex surface facing the reduction side.
  • the rear group Opr of the magnifying optical system Op is composed of the tenth lens element L10 to the twelfth lens element L12 in order from the magnifying side to the reducing side.
  • the tenth lens element L10 has a biconvex shape.
  • the eleventh lens element L11 has a positive meniscus shape with a convex surface facing the magnifying side.
  • the twelfth lens element L12 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the relay optical system Ol is composed of the 13th lens element L13 to the 25th lens element L25 in order from the enlargement side to the reduction side.
  • the thirteenth lens element L13 has a positive meniscus shape with a convex surface facing the reduction side.
  • the 14th lens element L14 has a biconcave shape.
  • the fifteenth lens element L15 has a positive meniscus shape with a convex surface facing the reduction side.
  • the 16th lens element L16 has a biconvex shape.
  • the 17th lens element L17 has a negative meniscus shape with a convex surface facing the reduction side.
  • the 18th lens element L18 has a biconvex shape.
  • the 19th lens element L19 has a positive meniscus shape with a convex surface facing the magnifying side.
  • the 20th lens element L20 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the 21st lens element L21 has a biconcave shape.
  • the 22nd lens element L22 has a biconvex shape.
  • the 23rd lens element L23 has a biconvex shape.
  • the 24th lens element L24 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the 25th lens element L25 has a biconvex shape.
  • the relay optical system Ol has a first lens group (L13 to L15) having a positive power, a second lens group (L16 to L17) having a positive power, and a positive power in order from the enlargement side to the reduction side.
  • the 1st lens group, the 4th lens group, and the 6th lens group are fixed, and the 2nd lens group, the 3rd lens group, and the 5th lens group are displaced along the optical axis, and are telescopic from the wide-angle end.
  • the second lens group, the third lens group, and the fifth lens group are displaced toward the magnifying side.
  • the relay optical system Ol has a first lens group (example of the first lens group) having positive power on the enlargement side, and a third lens group and a fifth lens group (example of two lens groups) on the reduction side. ), And the third lens group and the fifth lens group are on the magnifying side while the fourth lens group is fixed during zooming. Move to.
  • the zoom lens system according to the fifth embodiment includes a magnifying optical system Op and a relay optical system Ol.
  • the magnifying optical system Op is composed of the first lens element L1 to the twelfth lens element L12.
  • the magnifying optics Op includes a front group Opf and a rear group Opr.
  • the front group Opf of the magnifying optical system Op is composed of the first lens element L1 to the ninth lens element L9 in order from the magnifying side to the reducing side.
  • the first lens element L1 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the second lens element L2 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the third lens element L3 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the fourth lens element L4 has a positive meniscus shape with a convex surface facing the reduction side.
  • the fifth lens element L5 has a positive meniscus shape with a convex surface facing the reduction side.
  • the sixth lens element L6 has a positive meniscus shape with a convex surface facing the reduction side.
  • the seventh lens element L7 has a biconcave shape.
  • the eighth lens element L8 has a positive meniscus shape with a convex surface facing the reduction side.
  • the ninth lens element L9 has a biconvex shape.
  • the rear group Opr of the magnifying optical system Op is composed of the tenth lens element L10 to the twelfth lens element L12 in order from the magnifying side to the reducing side.
  • the tenth lens element L10 has a biconvex shape.
  • the eleventh lens element L11 has a positive meniscus shape with a convex surface facing the magnifying side.
  • the twelfth lens element L12 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the relay optical system Ol is composed of the 13th lens element L13 to the 25th lens element L25 in order from the enlargement side to the reduction side.
  • the thirteenth lens element L13 has a positive meniscus shape with a convex surface facing the reduction side.
  • the 14th lens element L14 has a biconcave shape.
  • the fifteenth lens element L15 has a positive meniscus shape with a convex surface facing the reduction side.
  • the 16th lens element L16 has a biconvex shape.
  • the 17th lens element L17 has a negative meniscus shape with a convex surface facing the reduction side.
  • the 18th lens element L18 has a biconvex shape.
  • the 19th lens element L19 has a positive meniscus shape with a convex surface facing the magnifying side.
  • the 20th lens element L20 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the 21st lens element L21 has a biconcave shape.
  • the 22nd lens element L22 has a biconvex shape.
  • the 23rd lens element L23 has a biconvex shape.
  • the 24th lens element L24 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the 25th lens element L25 has a biconvex shape.
  • the relay optical system Ol has a first lens group (L13 to L15) having a positive power, a second lens group (L16) having a positive power, and a third lens group having a negative power in order from the enlargement side to the reduction side.
  • the 1st lens group, the 5th lens group, and the 8th lens group are fixed, and the 2nd lens group, the 3rd lens group, the 3rd lens group, the 4th lens group, the 6th lens group, and the 7th lens group are fixed.
  • the lens group is displaced along the optical axis and zooms from the wide-angle end to the telescopic end, the second lens group, the third lens group, the fourth lens group, the sixth lens group, and the seventh lens group move to the magnifying side. Displace.
  • the relay optical system Ol has a first lens group (example of the first lens group) having positive power on the enlargement side, and a fourth lens group and a sixth lens group (example of two lens groups) on the reduction side. ), And the 4th lens group and the 6th lens group are on the magnifying side while the 5th lens group is fixed during zooming. Move to.
  • the relay optical system Ol further has a third lens group and a seventh lens group (examples of other negative lens groups), and the fifth lens group has a smaller negative power than the third lens group and the seventh lens group.
  • the zoom lens system according to the sixth embodiment includes a magnifying optical system Op and a relay optical system Ol.
  • the magnifying optical system Op is composed of the first lens element L1 to the twelfth lens element L12.
  • the magnifying optics Op includes a front group Opf and a rear group Opr.
  • the front group Opf of the magnifying optical system Op is composed of the first lens element L1 to the ninth lens element L9 in order from the magnifying side to the reducing side.
  • the first lens element L1 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the second lens element L2 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the third lens element L3 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the fourth lens element L4 has a positive meniscus shape with a convex surface facing the reduction side.
  • the fifth lens element L5 has a positive meniscus shape with a convex surface facing the reduction side.
  • the sixth lens element L6 has a positive meniscus shape with a convex surface facing the reduction side.
  • the seventh lens element L7 has a biconcave shape.
  • the eighth lens element L8 has a positive meniscus shape with a convex surface facing the reduction side.
  • the ninth lens element L9 has a biconvex shape.
  • the rear group Opr of the magnifying optical system Op is composed of the tenth lens element L10 to the twelfth lens element L12 in order from the magnifying side to the reducing side.
  • the tenth lens element L10 has a biconvex shape.
  • the eleventh lens element L11 has a positive meniscus shape with a convex surface facing the magnifying side.
  • the twelfth lens element L12 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the relay optical system Ol is composed of the 13th lens element L13 to the 25th lens element L25 in order from the enlargement side to the reduction side.
  • the thirteenth lens element L13 has a positive meniscus shape with a convex surface facing the reduction side.
  • the 14th lens element L14 has a biconcave shape.
  • the fifteenth lens element L15 has a positive meniscus shape with a convex surface facing the reduction side.
  • the 16th lens element L16 has a biconvex shape.
  • the 17th lens element L17 has a negative meniscus shape with a convex surface facing the reduction side.
  • the 18th lens element L18 has a biconvex shape.
  • the 19th lens element L19 has a positive meniscus shape with a convex surface facing the magnifying side.
  • the 20th lens element L20 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the 21st lens element L21 has a biconcave shape.
  • the 22nd lens element L22 has a biconvex shape.
  • the 23rd lens element L23 has a biconvex shape.
  • the 24th lens element L24 has a negative meniscus shape with a convex surface facing the magnifying side.
  • the 25th lens element L25 has a biconvex shape.
  • the relay optical system Ol has a first lens group (L13 to L15) having a negative power, a second lens group (L16 to L18) having a positive power, and a positive power in order from the enlargement side to the reduction side.
  • the 1st and 4th lens groups are fixed, the 2nd lens group, the 3rd lens group, the 5th lens group, and the 6th lens group are displaced along the optical axis, and are telescopic from the wide-angle end.
  • the second lens group, the fifth lens group, and the sixth lens group are displaced to the magnifying side, and the third lens group is displaced to the reducing side.
  • the relay optical system Ol has a first lens group (example of the first lens group) having a negative power on the enlargement side, and a third lens group and a fifth lens group (example of two lens groups) on the reduction side. ), And the 4th lens group is fixed during zooming, and the 3rd lens group moves to the reduction side. The group moves to the expansion side.
  • the relay optical system Ol further has a fourth lens group and a fifth lens group (examples of other negative lens groups), and the fourth lens group has a smaller negative power than the fifth lens group.
  • the zoom lens system according to Examples 1 to 6 includes not only a lens element having optical power but also an element having zero or substantially zero optical power, for example, a mirror, an aperture, a mask, a cover glass, a filter, and the like.
  • Optical elements such as prisms, wave plates, and polarizing elements may be included.
  • the zoom lens system according to the first to sixth embodiments is an optical system having an intermediate imaging position internally which is conjugated to an expansion conjugate point on the enlargement side and a reduction conjugate point on the reduction side, respectively, from the intermediate imaging position.
  • a first lens group including a magnifying optical system located on the magnifying side and a relay optical system located on the reducing side from the intermediate imaging position, and the relay optical system has a positive power on the magnifying side.
  • a state in which two lens groups and a negative lens group arranged between the two lens groups are provided on the reduction side of the first lens group, and the negative lens group is fixed during zooming. Then, the two lens groups move.
  • the effective diameter of the lens can be reduced, the weight of the lens can be reduced, and the zoom operating mechanism can be easily configured, so that the mechanical parts can be reduced in weight.
  • the weight of the entire lens can be reduced.
  • the first lens group and the magnifying optical system are fixed at the time of zooming.
  • the zoom operation mechanism for example, a cam, a motor, etc.
  • the zoom operation mechanism for example, a cam, a motor, etc.
  • the relay optical system further has another negative lens group, and the negative lens group has a smaller negative power than the other negative lens group.
  • the negative lens group has an aperture.
  • the lens on the most reduced side of the magnifying optical system is a negative lens.
  • the effective diameter of the lens close to the intermediate imaging can be reduced, and the weight of the lens can be reduced.
  • the lens on the most magnified side of the relay optical system is a positive lens.
  • the effective diameter of the lens close to the intermediate imaging can be reduced, and the weight of the lens can be reduced.
  • the zoom lens system according to Examples 1 to 6 may satisfy the condition (1). 0.1 ⁇ fp / fr ⁇ 0.5 ... (1) here, fp: Focal length of the magnifying optical system fr: Focal length of the relay optical system at the wide-angle end.
  • Condition (1) is a conditional expression for defining the relationship between the magnifying optical system and the combined focal length of the relay optical system. By satisfying this, it is possible to realize an optical system having a wide angle and a small lens diameter. If it falls below the lower limit of the conditional expression (1), the effective diameter of the positive power lens element, which is on the magnifying side from the intermediate imaging position and is the second closest to the magnifying side from the intermediate imaging position, becomes too large. The lens becomes heavy. On the contrary, if the upper limit is exceeded, the effective diameter of the lens on the most enlarged side becomes too large, and the lens becomes heavy.
  • the zoom lens system according to Examples 1 to 6 may satisfy the condition (2). 100 ⁇
  • Condition (2) is a conditional expression for defining the relationship between the focal length of the first lens group and the focal length of the entire system at the wide-angle end. By satisfying this, it is possible to realize an optical system having a wide angle and a small lens diameter. If the upper limit side of the condition (2) is exceeded, the aperture of the first lens group becomes too large and the lens becomes heavy. On the contrary, if it falls below the lower limit, the aperture of the rear group of the magnifying optical system becomes too large, and the lens becomes heavy.
  • the zoom lens system according to Examples 1 to 6 may satisfy the condition (3). 5 ⁇ frn / fw ⁇ 50 ... (3) here, frn: Focal length of the negative lens group fw: Focal length of the entire system at the wide-angle end.
  • Condition (3) is a conditional expression for defining the relationship between the focal length of the negative lens group and the focal length of the entire system at the wide-angle end. By satisfying this, it is possible to realize an optical system having a wide angle and a small lens diameter. If the upper limit side of the condition (3) is exceeded, the aperture of the negative lens group becomes too large and the lens becomes heavy. On the contrary, if it falls below the lower limit, the aperture of the group on the reduction side becomes too large as compared with the negative lens group, and the lens becomes heavy.
  • the magnifying optical system has the longest air spacing
  • the magnifying optical system front group on the magnifying side and the magnifying optical system rear on the reducing side are separated by the longest air spacing.
  • a group may be provided and the conditions (4) and (5) may be satisfied.
  • Condition (4) is a conditional expression that defines the relationship between the longest air spacing in the magnifying optical system and the focal length of the entire system at the wide-angle end. By satisfying the condition (4), the optical system can be widened. If it falls below the lower limit of the condition (4), the lens in the front group of the magnifying optical system becomes heavy. If the upper limit of the condition (4) is exceeded, the center of gravity of the entire optical system moves to the enlargement side.
  • Condition (5) is a conditional expression that defines the relationship between the distance from the magnifying surface of the rear group of the magnifying optical system to the intermediate imaging and the focal length of the entire system at the wide-angle end. By satisfying the condition (5), the effect of the condition (4) can be exhibited.
  • the zoom lens system according to Examples 1 to 6 may satisfy the following conditional expression (6). 0.8 ⁇ Tp / Tr ⁇ 1.0 ... (6) here, Tp: Distance from the most magnifying surface of the magnifying optical system to the intermediate imaging position Tr: Distance from the intermediate imaging position at the wide-angle end to the most reducing surface of the relay optical system.
  • Condition (6) is the relationship between the distance from the most magnifying surface of the magnifying optical system to the intermediate imaging position and the distance from the intermediate imaging position at the wide-angle end to the most reducing surface of the relay optical system. It is a conditional expression to specify. If the upper limit of the condition (6) is exceeded, it becomes difficult to correct the curvature of field. If it falls below the lower limit of the condition (6), the center of gravity moves to the expansion side.
  • the magnifying optical system has the longest air spacing, and the magnifying optical system front group on the magnifying side and the magnifying optical system rear group on the reducing side are separated by the longest air spacing. And, the following conditional expression (7) may be satisfied. 7 ⁇
  • Condition (7) is a conditional expression that defines the relationship between the focal length of the rear group of the magnifying optical system and the focal length of the entire system at the wide-angle end. If the upper limit of the condition (7) is exceeded, the aperture of the rear group of the magnifying optical system becomes too large, and the lens becomes heavy. If it falls below the lower limit of the condition (7), the aperture of the front group of the magnifying optical system becomes too large, and the lens becomes heavy.
  • the magnifying optical system has the longest air spacing, and the magnifying optical system front group on the magnifying side and the magnifying optical system rear group on the reducing side are separated by the longest air spacing. And, the following conditional expression (8) may be satisfied. 2 ⁇
  • Condition (8) is a conditional expression that defines the relationship between the focal length of the front group of the magnifying optical system and the focal length of the entire system at the wide-angle end. If the upper limit of the condition (8) is exceeded, the aperture of the front group of the magnifying optical system becomes too large, and the lens becomes heavy. If it falls below the lower limit of the condition (8), the aperture of the rear group of the magnifying optical system becomes too large, and the lens becomes heavy.
  • the first lens element is arranged on the most magnified side of the magnifying optical system, and the first lens element is an aspherical first lens magnifying lens facing the magnifying side. It has a side surface and an aspherical first lens reduction side surface facing the reduction side.
  • the first lens enlargement side surface and the first lens reduction side surface may satisfy the following condition (9) within the effective diameter from r> 0. dZ (r) / dr> 0 ...
  • r Distance from the apex of the plane along the plane perpendicular to the optical axis of the optical system (r> 0)
  • Condition (9) is a conditional expression that defines that the first derivative dZ (r) / dr of the surface sag amount Z (r) is positive.
  • the first lens element may be made of synthetic resin.
  • the weight of the lens can be reduced by using a synthetic resin.
  • all the lens elements satisfying the condition (10) among the plurality of lens elements may satisfy the condition (11), and the plurality of lens elements may satisfy the condition (11).
  • One of the lens elements does not have to satisfy both the conditions (10) and (11).
  • Condition (10) is a conditional expression that defines the relationship between the height at which the off-axis main ray at the telephoto end passes through the lens surface, the focal length of the entire system at the wide-angle end, and the maximum half-angle of view at the wide-angle end.
  • Condition (11) is a conditional expression that defines the glass transition point of the lens material.
  • the region not satisfying (10) in order to be less affected by heat and broaden the selection range of the glass material, even if a material not satisfying the glass transition point Tg of the lens material is selected.
  • a material having a low glass transition point Tg such as resin can be selected, and the weight can be reduced.
  • the zoom lens system according to Examples 1 to 6 may satisfy the following conditional expression (12). ⁇ m> 65 °... (12) here, ⁇ m: The maximum half-angle of view at the wide-angle end.
  • Condition (12) is a conditional expression that defines the maximum half-angle of view at the wide-angle end. By satisfying the condition (12), the working distance (working distance) can be shortened.
  • the zoom lens system according to Examples 1 to 6 may satisfy the following conditional expression (13). -1.5 ⁇ (L1R1 + L1R2) / (L1R2-L1R1) ⁇ -0.9 ... (13) here, L1R1: The central radius of curvature of the lens enlargement side surface on the most magnifying side L1R2: The central radius of curvature of the lens reduction side surface on the most magnifying side.
  • Condition (13) is a conditional expression that defines the shaping factor of the first lens element located on the magnifying side in the magnifying optical system.
  • condition (13) a more advantageous effect can be obtained by further satisfying the following condition (13A). -1.2 ⁇ (L1R1 + L1R2) / (L1R2-L1R1) ⁇ -1.07 ... (13A)
  • the group on the most enlarged side of the rear group has positive power, and may move to the enlarged side when zooming from the wide-angle end to the telephoto end.
  • the group on the enlargement side adjacent to the negative group may have positive power
  • the group adjacent to the reduction side may have positive power
  • the unit of length in the table is "mm", and the unit of angle of view is "°".
  • r is the radius of curvature
  • d is the surface spacing
  • nd is the refractive index for the d line
  • vd is the Abbe number for the d line.
  • the surface marked with * is an aspherical surface, and the aspherical surface shape is defined by the following equation.
  • Z The distance from the point on the aspherical surface whose height from the optical axis is h to the tangent plane of the aspherical apex
  • h Distance from the optical axis
  • r radius of curvature of the apex
  • ⁇ Cone constant
  • An An aspherical coefficient of order n.
  • Table 20 below shows the values of the variables of the conditional expressions (1) to (13) and the focal length of each group in each numerical example.
  • fp Focal length of the magnifying optical system fr: Focal length of the relay optical system at the wide-angle end
  • fw Focal length of the system fr1: Focal length of the first lens group frn: Focal length of the negative lens group
  • Ts Longest of the magnifying optical system Air spacing
  • Tpr Distance from the most magnified surface of the rear group of the magnifying optics to the intermediate imaging
  • Tp Distance from the most magnifying surface of the magnifying optical system to the intermediate imaging Tr: From the intermediate imaging at the wide-angle end Distance to the most reduced surface of the relay optical system
  • fpr Focal length of the rear group of the magnifying optical system
  • fpf Focal length of the front group of the magnifying optical system
  • ⁇ m Maximum half-angle angle at the wide-angle end ym: Passing through the surface at the telescopic end Height through which the main
  • Tables 21 and 22 below show the
  • the lens material Z330R is a product name of cycloolefin polymer (COP) (Zeon Corporation).
  • the lens element L1 can be made of various synthetic resins, thereby reducing the weight.
  • the remaining lens elements L2 to L25 are also made of various synthetic resins to reduce the weight. [Table 21] [Table 22]
  • FIG. 19 is a block diagram showing an example of the image projection device according to the present disclosure.
  • the image projection device 100 includes the optical system 1, the image forming element 101, the light source 102, the control unit 110, and the like disclosed in the first embodiment.
  • the image forming element 101 is composed of a liquid crystal display, a DMD, or the like, and generates an image to be projected on the screen SR via the optical system 1.
  • the light source 102 is composed of an LED (light emitting diode), a laser, or the like, and supplies light to the image forming element 101.
  • the control unit 110 is composed of a CPU, an MPU, or the like, and controls the entire device and each component.
  • the optical system 1 may be configured as an interchangeable lens that can be detachably attached to the image projection device 100. In this case, the device in which the optical system 1 is removed from the image projection device 100 is an example of the main body device.
  • the optical system 1 can reduce the moment acting on the center of gravity of the optical system 1, and can realize a wide-angle zoom function while reducing the influence of heat.
  • FIG. 20 is a block diagram showing an example of the image pickup apparatus according to the present disclosure.
  • the image pickup device 200 includes the optical system 1 disclosed in the first embodiment, the image pickup device 201, the control unit 210, and the like.
  • the image pickup device 201 is composed of a CCD (charge-coupled device) image sensor, a CMOS image sensor, and the like, and receives an optical image of an object OBJ formed by the optical system 1 and converts it into an electrical image signal.
  • the control unit 110 is composed of a CPU, an MPU, or the like, and controls the entire device and each component.
  • the optical system 1 may be configured as an interchangeable lens that can be detachably attached to the image pickup apparatus 200. In this case, the device in which the optical system 1 is removed from the image pickup device 200 is an example of the main body device.
  • the moment acting on the center of gravity of the optical system 1 can be reduced by the optical system 1 according to the first embodiment, and a wide-angle zoom function can be realized while reducing the influence of heat.
  • the present disclosure is applicable to image projection devices such as projectors and head-up displays, and imaging devices such as digital still cameras, digital video cameras, surveillance cameras in surveillance systems, Web cameras, and in-vehicle cameras.
  • imaging devices such as digital still cameras, digital video cameras, surveillance cameras in surveillance systems, Web cameras, and in-vehicle cameras.
  • the present disclosure is applicable to optical systems that require high image quality, such as projectors, digital still camera systems, and digital video camera systems.

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PCT/JP2020/042935 2020-02-27 2020-11-18 光学系、画像投写装置および撮像装置 Ceased WO2021171713A1 (ja)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008090200A (ja) * 2006-10-05 2008-04-17 Sony Corp ズームレンズおよび投射型画像表示装置
US20150103403A1 (en) * 2013-10-10 2015-04-16 Kazuhiro Oe Zoom lens system and imaging apparatus
JP2018180447A (ja) * 2017-04-20 2018-11-15 コニカミノルタ株式会社 投影光学系及び投影装置
JP2019204128A (ja) * 2019-08-27 2019-11-28 コニカミノルタ株式会社 投影光学系及びプロジェクター

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4919392B2 (ja) * 2006-05-10 2012-04-18 富士フイルム株式会社 投影用ズームレンズおよび投写型表示装置
JP5365155B2 (ja) * 2008-11-21 2013-12-11 ソニー株式会社 投射型画像表示装置および投射光学系
JP6578662B2 (ja) * 2015-02-05 2019-09-25 コニカミノルタ株式会社 投影光学系及びプロジェクター
JP6587591B2 (ja) * 2016-08-30 2019-10-09 富士フイルム株式会社 ズームレンズ、投写型表示装置、および、撮像装置
JP2018036390A (ja) * 2016-08-30 2018-03-08 富士フイルム株式会社 広角レンズ、投写型表示装置、および、撮像装置
JP6712932B2 (ja) * 2016-08-30 2020-06-24 富士フイルム株式会社 ズームレンズ、投写型表示装置、および、撮像装置
US10816780B2 (en) * 2017-03-29 2020-10-27 Panasonic Intellectual Property Management Co., Ltd. Lens system, and image projection apparatus and imaging apparatus that include the same
JP6939469B2 (ja) * 2017-11-27 2021-09-22 セイコーエプソン株式会社 投写光学系および投写型画像表示装置
JP2021036251A (ja) * 2017-12-19 2021-03-04 パナソニックＩｐマネジメント株式会社 投写レンズ系及び画像投写装置
US10838179B2 (en) * 2018-02-28 2020-11-17 Fujifilm Corporation Wide-angle lens, projection lens, relay lens, projection-type display apparatus, and relay lens unit
JP6858153B2 (ja) 2018-03-28 2021-04-14 富士フイルム株式会社 結像光学系、投写型表示装置、および撮像装置
JP2021076771A (ja) * 2019-11-12 2021-05-20 キヤノン株式会社 結像光学系およびそれを有する画像投影装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008090200A (ja) * 2006-10-05 2008-04-17 Sony Corp ズームレンズおよび投射型画像表示装置
US20150103403A1 (en) * 2013-10-10 2015-04-16 Kazuhiro Oe Zoom lens system and imaging apparatus
JP2018180447A (ja) * 2017-04-20 2018-11-15 コニカミノルタ株式会社 投影光学系及び投影装置
JP2019204128A (ja) * 2019-08-27 2019-11-28 コニカミノルタ株式会社 投影光学系及びプロジェクター

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