WO2018117210A1 - Système optique de projection et projecteur - Google Patents

Système optique de projection et projecteur Download PDF

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Publication number
WO2018117210A1
WO2018117210A1 PCT/JP2017/045877 JP2017045877W WO2018117210A1 WO 2018117210 A1 WO2018117210 A1 WO 2018117210A1 JP 2017045877 W JP2017045877 W JP 2017045877W WO 2018117210 A1 WO2018117210 A1 WO 2018117210A1
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Prior art keywords
optical system
lens
projection optical
image
intermediate image
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PCT/JP2017/045877
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English (en)
Japanese (ja)
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吉田　政史
恭彦 松尾
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株式会社ｎｉｔｔｏｈ
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Publication of WO2018117210A1 publication Critical patent/WO2018117210A1/fr

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    • 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
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems

Definitions

  • the present invention relates to a projection optical system of a projector.
  • Japanese Unexamined Patent Publication No. 2013-61604 discloses a technique for providing a smaller projection optical system capable of projecting a good image on a projection surface at a shorter distance.
  • This document 1 forms a first image conjugate with an object and has a first optical system having an optical axis and a second optical that projects a second image conjugate with the first image onto a projection surface.
  • a projection optical system including the system is disclosed.
  • the first image satisfies the condition of Im ⁇ Tr ⁇ 1.70.
  • Im represents the length of the first image in the direction of the optical axis of the first optical system normalized by the focal length of the first optical system
  • Tr represents the slow ratio for the projection optical system.
  • the slow ratio is the ratio of the projection distance of the projection optical system (from the principal point of the second optical system to the screen) to the size of the image projected on the screen in the horizontal direction.
  • One aspect of the present invention is a projection optical system that projects from a first image plane on the reduction side to a second image plane on the enlargement side, and has a first optical system that includes a plurality of lenses. It is a system.
  • the first optical system enlarges the first intermediate image formed on the first side of the optical axis inside the first optical system by the light incident from the reduction side as compared with the first optical system.
  • An image is formed as a second intermediate image on the second side of the side optical axis.
  • the projection optical system further includes a second optical system including a first reflecting surface having a positive refractive power and located closer to the enlargement side than the second intermediate image.
  • the first optical system includes a first lens system including a first cemented lens and a biconvex first positive lens arranged in order from the reduction side on the most enlargement side.
  • a first optical system that forms a first intermediate image therein and forms the first intermediate image as a second intermediate image on the enlargement side, that is, the input side (reduction side) of the first reflecting surface
  • the projection optical system which has can shorten the length along the optical axis of the 2nd intermediate image used as the input of the 1st reflective surface. For this reason, it is possible to dispose a compact first reflecting surface having a large refractive power, and it is possible to provide a projection optical system that is compact, has a high magnification, and has a small slow ratio.
  • the first intermediate image formed on the first side of the optical axis is placed on the enlargement side of the first optical system, and the second side of the optical axis, that is, the first intermediate image and the optical axis are sandwiched.
  • the most magnified side is composed of a first cemented lens arranged in order from the reduction side and a biconvex first positive lens.
  • the light beam forming the second intermediate image can be designed so as to intersect the optical axis mainly in the first lens system including the first positive lens and the first cemented lens. Therefore, the second intermediate image can be formed near the first optical system, and the diameter on the enlargement side of the first optical system is reduced. Can be placed near the system.
  • the light beam forming the second intermediate image mainly intersects the optical axis in the first lens system
  • the light beam forming the second intermediate image is the first cemented lens and the first positive lens. The positions passing through the lens are dispersed, and it becomes easy to correct the aberration by these lenses. For this reason, it is easy to correct not only chromatic aberration but also field curvature and astigmatism by the first lens system including the first cemented lens.
  • the first cemented lens has a negative refractive power. While the light beam concentrates and intersects with the optical axis in the first lens system, it is suitable for aberration correction, while tolerance sensitivity (error sensitivity, effect amount) is increased.
  • tolerance sensitivity error sensitivity, effect amount
  • the enlargement side surface of the first cemented lens may be a concave surface on the enlargement side.
  • the curvature radii (curvature) of these surfaces are It can be turned in the same direction and the change in the surface spacing can be suppressed. Therefore, tolerance sensitivity by the combination of these lenses can be reduced, and an image with higher image quality can be projected more stably.
  • the combined focal length fa of the projection optical system and the radius of curvature rm of the first reflecting surface may satisfy the following conditions (1) and (2). 40 ⁇
  • condition (1) the power of the first reflecting surface and the power of the projection optical system are sufficiently large, and the power of the first reflecting surface in the power of the projection optical system is in the range shown in condition (2). It is suitable for providing a projection optical system that is compact and has a small slow ratio.
  • the lower limit of the condition (1) may be 45.5, and the upper limit may be 60.0 or 49.0. Further, the lower limit of the condition (2) may be 6.25, and the upper limit may be 6.65.
  • the curvature radius rm of the first reflecting surface satisfies the following condition (3). 15.0 ⁇
  • the first optical system includes an intermediate lens formed so as to straddle the first intermediate image, a first lens group disposed on the reduction side of the intermediate lens including the intermediate lens, and an enlargement side of the intermediate lens.
  • the second lens group may be included.
  • the first intermediate image may be formed to be inclined so as to approach the reduction side as it is away from the optical axis.
  • the base end close to the optical axis of the first intermediate image is enlarged outside the intermediate lens.
  • the tip of the first intermediate image that is away from the optical axis is located on the reduction side outside the intermediate lens.
  • the first intermediate image is an image in the course of aberration correction, and the influence of straddling the intermediate lens is small, and it is easy to correct it.
  • the lower limit of condition (3) may be 16.5, and the upper limit may be 18.5.
  • the combined focal length fa of the projection optical system and the combined focal length f2 of the second lens group satisfy the following condition (4). 8 ⁇ f2 / fa ⁇ 20 (4)
  • the unit of the synthetic focal length fa and the synthetic focal length f2 is mm.
  • the lower limit of the condition (4) may be 10.0 or 13.0. Further, the upper limit may be 18.0 or 15.0.
  • the luminous flux concentrates around the optical axis, so that the effective diameter of the first lens system may be relatively small and compact.
  • interference with the light beam reflected by the first reflecting surface can be easily removed.
  • the first optical system with respect to the total length La along the optical axis from the reduction side surface of the first reduction lens to the first reflection surface of the first optical system.
  • the ratio of Le (the effective length of the refracting optical system, the distance along the optical axis from the reduction side surface of the most reduction lens to the enlargement side surface of the enlargement side lens) is 0.
  • the ratio of the space that can be used for aberration correction is large with respect to the total length, such as 6 or more, and more than 0.62, and the entire optical system can be made compact and slow as shown in condition (6).
  • An optical system with a ratio TR of 0.19 or less, and even smaller than 0.19 can be provided.
  • the above projection optical system as shown in the condition (7), with respect to the total length La along the optical axis from the reduction side surface of the first reduction lens to the first reflection surface of the first optical system.
  • the ratio of the length from the first optical system to the first reflecting surface (the length along the optical axis from the lens surface on the most enlarged side of the first optical system to the first reflecting surface) Lf is 0. .35 or less, and smaller than 0.38, the ratio of the space between the refractive optical system and the reflecting surface that cannot be used for aberration correction to the entire length is small, and the entire optical system is In addition to being compact, it is possible to provide an optical system with a slow ratio TR of 0.19 or less as shown in condition (6). 0.26 ⁇ Lf / La ⁇ 0.38 (7)
  • One of the different aspects of the present invention is a projector having the projection optical system described above and a light modulator that forms an image on the first image plane.
  • the projector may include an illumination optical system that illuminates the first image plane.
  • the first optical system includes an intermediate lens formed so as to straddle the first intermediate image, a first lens group disposed on the reduction side of the intermediate lens including the intermediate lens, and an enlargement side of the intermediate lens.
  • the second lens group may be included.
  • the first intermediate image may be formed to be inclined so as to approach the reduction side as it is away from the optical axis.
  • the base end close to the optical axis of the first intermediate image is enlarged outside the intermediate lens.
  • the tip of the first intermediate image that is away from the optical axis is located on the reduction side outside the intermediate lens.
  • the first intermediate image is an image in the course of aberration correction, and the influence of straddling the intermediate lens is small, and it is easy to correct it.
  • the focal length fm of the intermediate lens and the combined focal length fa of the projection optical system may satisfy the following condition (8). If the power of the intermediate lens is too large, the effect on focusing is too large to adjust, and if it is too small, it is not suitable for focusing. 10 ⁇
  • the first optical system includes a front lens disposed adjacent to the reduction side of the intermediate lens, and a front focusing lens group that moves for focusing, and a lens that is disposed adjacent to the magnification side of the intermediate lens. And a rear focusing lens group that includes a side lens and moves for focusing. Since the amount of movement of the intermediate lens for focusing is limited, a clearer image can be displayed by moving the lens groups before and after the intermediate lens for focusing.
  • the first optical system includes an intermediate lens and a front focusing lens group, includes a first lens group disposed on the reduction side of the intermediate lens and a rear focusing lens group, and is disposed on the enlargement side of the intermediate lens. And a second lens group.
  • the first lens group includes a lens disposed on the reduction side of the front focusing lens group, and includes a front fixed lens group that does not move during focusing.
  • the second lens group includes a lens disposed on the enlargement side of the rear focusing lens group, and includes a rear fixed lens group that does not move during focusing.
  • the intermediate lens, the front focusing lens group, and the rear focusing lens group respectively move from the standard state to the reduction side for focusing from the standard state, and move to the enlargement side for focusing from the standard state to the infinite side.
  • the distance Di1 that the front side focusing lens group moves to focus from the closest side to the infinity side, the distance Di2 that the intermediate lens moves to focus from the near side to the infinity side, and the rear side focusing lens group The distance Di3 moved for focusing from the side to the infinite side may satisfy the following condition (9). Di2 ⁇ Di1 ⁇ Di3 (9)
  • the combined focal length ff of the front focusing lens group, the focal length fm of the intermediate lens, and the combined focal length fr of the rear focusing lens group may satisfy the following condition (10). fr ⁇ fm ⁇ ff (10)
  • the figure which shows an example of a structure of a projector and a projection optical system The figure which shows lens data. The figure which shows the focal distance of each lens and a lens group. The figure which shows aspherical data. The figure which shows the position of each group in the case of focusing. The figure which shows an aberration.
  • the figure which shows an example of a structure of a different projector and projection optical system The figure which shows the lens data of the projection optical system shown in FIG.
  • the figure which shows aspherical data The figure which shows the position of each group in the case of focusing.
  • the figure which shows an aberration The figure which shows an example of a structure of a different projector and projection optical system.
  • FIG. 1 The figure which shows the lens data of the projection optical system shown in FIG.
  • FIG. 1 shows an example of a projector.
  • the projector 1 projects a projection optical system 10 that projects from an image plane (first image plane) 5 a of a light modulator (light valve) 5 on the reduction side 2 onto a screen or wall surface (second image plane) 6 on the enlargement side 3.
  • the light valve 5 may be an LCD, a digital mirror device (DMD), an organic EL, or the like that can form an image, and may be a single plate type or a system that forms an image of each color.
  • the light bulb 5 may be a light emitting type or an illumination type. In the case of the illumination type, the projector 1 further includes an illumination optical system (not shown).
  • the screen 6 may be a wall surface or a white board, and the projector 1 may be a front projector or a rear projector including a screen.
  • the projection optical system 10 includes a first optical system 11 including a plurality of lenses and a second optical system 12 including a first reflecting surface M1 having a positive refractive power.
  • the reflection surface M1 of the second optical system 12 reflects the light output from the first optical system 11 and projects it onto the screen 6 as projection light 19.
  • the first optical system 11 generates a second intermediate image IM1 formed inside the first optical system 11 by the light incident from the reduction side 2 on the enlargement side 3 from the first optical system 11. This is a refractive optical system (lens system) that forms an intermediate image IM2.
  • the first intermediate image IM1 is formed on the upper side (first side) of the optical axis 7 in the drawing
  • the second intermediate image IM2 is a light beam with respect to the first intermediate image IM1.
  • the image is formed on the opposite side of the axis 7 (the lower side of the drawing, the second side).
  • the first optical system 11 is arranged on the reduction side (input side) 2 and has a first lens group (first refractive optical system) G1 having a positive power as a whole and an enlargement of the first lens group G1. And a second lens group (second refractive optical system) G2 which is disposed on the side (output side) 3 and has a positive power as a whole.
  • the lens on the most enlargement side 3 of the first lens group G1 is an intermediate lens L9 formed so as to straddle the first intermediate image IM1, and the first lens group G1 and the second lens group G2 are used to form a first lens L9.
  • the intermediate image IM1 is formed as a second intermediate image IM2 on the reduction side 2 of the first reflecting surface (mirror) M1.
  • the positive power mirror M1 magnifies and projects the second intermediate image IM2 onto the screen 6.
  • FIG. 2 shows data of each element of the projection optical system 10.
  • S is the surface number when the element is a lens
  • Ri is the radius of curvature (mm) of each element (each lens surface in the case of a lens) arranged in order from the reduction side 2
  • di is in order from the reduction side 2.
  • the distance (space, mm) between the surfaces of each element, Di represents the effective diameter (diameter, mm), refractive index (d line), and Abbe number (d line) of each element.
  • FIG. 3 shows the focal length (mm) of each lens and a combination of a plurality of lenses.
  • FIG. 4 shows an aspheric surface number and aspheric surface data in each element surface.
  • the aspherical surface is represented by the coefficient Ri shown in FIG.
  • a first optical system (lens system, refractive optical system) 11 of the projection optical system 10 includes, from the reduction side 2, an incident side glass block CG, a first lens group G1, and a second lens group G2. Including.
  • the first lens group G1 includes, from the reduction side (light valve side) 2, a biconvex positive lens L1, a stop St, a negative meniscus lens L2 convex to the reduction side 2, and a biconcave negative lens L3.
  • the lenses L3 and L4 are cemented to form a cemented lens (balsam lens) B1, and the lenses L5 and L6 are cemented to configure a cemented lens B2.
  • the cemented lens B1 is suitable for correcting axial chromatic aberration
  • the cemented lens B2 is suitable for correcting lateral chromatic aberration.
  • the second lens group G2 includes a positive meniscus lens L10 convex from the reduction side 2 to the reduction side 2, a biconcave negative lens L11, a biconvex positive lens L12, and a biconvex positive lens L13.
  • the six-lens configuration includes a biconcave negative lens L14 and a biconvex positive lens L15.
  • the lenses L13 and L14 are cemented to form a cemented lens B3.
  • the cemented lens B3 is suitable for correcting axial chromatic aberration and lateral chromatic aberration.
  • the biconvex positive lens L15 is the lens on the most magnifying side 3 of the first optical system 11, and becomes the first positive lens L15. Further, the cemented lens B3 becomes the first cemented lens B3 disposed on the reduction side 2 with only the air interval from the first positive lens L15. Therefore, the first optical system 11 includes the first lens system LS1 including the first cemented lens B3 and the first positive lens L15 on the most enlargement side 3.
  • the projection optical system 10 is an interfocus type, and the lenses L7 and L8 of the first lens group G1 move together as a first focusing group LF1 for focus adjustment, and the lens L9 of the first lens group G1.
  • the (intermediate lens) moves as a second focusing group LF2 for focus adjustment, and the lenses L10, L11 and L12 of the second lens group G2 serve as a third focusing group LF3 for focus adjustment. Move together.
  • the first focusing group LF1 is a front focusing lens group that includes a front lens L8 disposed adjacent to the reduction side 2 of the intermediate lens L9 and moves for focusing.
  • the third focusing group LF3 is a rear focusing lens group that includes a rear lens L10 disposed adjacent to the magnification side 3 of the intermediate lens L9 and moves for focusing.
  • the first lens group G1 includes a second focusing group LF2, a first focusing group LF1, which is a front focusing lens group, and lenses L1 to L6 arranged on the reduction side 2, and is used for focusing.
  • the front fixed lens group FF1 that does not move to the front.
  • the second lens group G2 includes a rear focusing lens group LF3 and lenses L13 to L15 arranged on the enlargement side 3, and is a first lens system LS1 that is a rear fixed lens group that does not move during focusing. Including.
  • the first intermediate image IM1 is formed to be inclined so as to approach the reduction side 2 when it is separated from the optical axis 7.
  • An intermediate lens L9 is provided so as to straddle the first intermediate image IM1.
  • a large number of lenses in this example, 15 lenses (lenses L1 to L1) are provided for the entire length La of the first optical system 11. L15) can be arranged.
  • the overall length of the projection optical system 1 can be shortened, the slow ratio TR can be reduced, and the projected image quality can be improved.
  • an increase in the lens diameter near the first intermediate image can be suppressed, which is also suitable for downsizing.
  • the intermediate lens L9 is a lens that moves to the standard state Pos1, the closest side Pos2, and the infinite side Pos3 for focusing. Before and after the first intermediate image IM1, the light beam 8 is dispersed corresponding to the image height (direction away from the optical axis 7).
  • the intermediate lens L9 formed across the first intermediate image IM1 has a large effect on focusing, and moving the intermediate lens L9 is suitable for focusing.
  • the base end IM1-b close to the optical axis 7 of the first intermediate image IM1 has an enlargement side 3 outside the intermediate lens L9, that is, an enlargement outside the surface S16 on the enlargement side 3 of the lens L9.
  • the tip IM1-t of the first intermediate image IM1 away from the optical axis 7 is located on the reduction side 2 outside the intermediate lens L9, that is, on the reduction side 2 of the surface S15 on the reduction side 2 of the lens L9.
  • the intermediate lens L9 (second focusing group LF2) moves between the distal end IM1-t and the proximal end IM1-b for focusing.
  • the base end IM1-b of the first intermediate image IM1 moves so as to enter the intermediate lens L9, the image is clear on the side of the base end IM1-b, and dust or the like is attached to the surface of the intermediate lens L9. It becomes susceptible to that.
  • the intermediate lens L9 moves so that the front end IM1-t of the first intermediate image IM1 enters the intermediate lens L9, it becomes difficult to correct the aberration of the peripheral portion having a large magnification rate away from the optical axis 7 of the image.
  • the intermediate lens L9 in this example is a positive meniscus lens that is inclined in the opposite direction to the first intermediate image IM1 and is convex on the reduction side 2.
  • a lens (front lens) L8 disposed adjacent to the reduction side 2 of the intermediate lens L9 is a negative meniscus convex to the enlargement side 3, and the lens interval between the intermediate lens L9 and the front lens L8 is the optical axis.
  • the combination of these lenses L8 and L9 is suitable for trapezoidal correction.
  • the distance d28 from the mirror M1 to the screen 6 is the first focusing group LF1, the second focusing group LF2, and the first focusing group LF2 in the standard state (Pos1), the closest side (Pos2), and the infinite side (Pos3).
  • 3 shows distances d10, d14, d16 and d22 indicating the positional relationship of the three focusing groups LF3.
  • the distance d10 indicates the distance between the surface S10 on the enlargement side 3 of the lens L6 and the surface S11 on the reduction side 2 of the lens L7
  • the distance d14 indicates the surface S14 on the enlargement side 3 of the lens L8 and the surface S15 on the reduction side 2 of the lens L9.
  • the distance d16 represents the distance between the surface S16 on the enlargement side 3 of the lens L9 and the surface S17 on the reduction side 2 of the lens L10
  • the distance d22 represents the distance between the surface S22 on the enlargement side 3 of the lens L12 and the lens L13.
  • the distance from the reduction side 2 surface S23 is shown. The same applies to the following embodiments.
  • These focusing groups LF1, LF2, and LF3 are moved from the reduction side 2 to the enlargement side 3 as the focal length from the closest side to the infinite side through the standard state increases, that is, as the distance between the mirror M1 and the screen 6 increases. , Each move, and the amount of movement varies depending on each group.
  • the first focusing group LF1, which is the front focusing lens group, moves monotonously to the enlargement side 3 by the distance Di1 when focusing from the closest side Pos2 to the infinite side Pos3. That is, the first focusing group LF1 moves to the reduction side 2 at the closest side Pos2 and moves to the enlargement side 3 at the infinite side Pos3 with respect to the standard state Pos1.
  • the third focusing group FL3, which is the rear focusing lens group, is the same, and in order to perform focusing, from the closest side Pos2 to the infinite side Pos3, the standard state Pos1 is sandwiched monotonically from the reduction side 2 to the enlargement side 3. Move by distance Di3.
  • the distances Di1, Di2, and Di3 are calculated as follows.
  • the smallest moving amount is the second focusing group LF2 including the intermediate lens L9 which is formed so as to straddle the first intermediate image IM1 and has a large effect amount (tolerance sensitivity) during focusing.
  • These three focusing groups LF1, FL2 and LF3 are groups of lenses arranged in the vicinity of the first intermediate image IM1, and the light beams before and after the first intermediate image IM1 are relatively parallel to the optical axis or Pass through in a dispersed manner. For this reason, it is easy to finely adjust the aberration correction by moving the lenses included in these focusing groups LF1, LF2, and LF3 and finely adjusting the positions where the light rays are dispersed and passed. For this reason, the fluctuation
  • FIG. 6A shows spherical aberration, astigmatism, and distortion in the standard state
  • FIG. 6B shows lateral aberration diagrams (coma aberration) at various image heights in the standard state.
  • various aberrations including coma are corrected well, and a clear image can be projected onto the screen 6.
  • the spherical aberration in FIG. 6A and the coma aberration in FIG. 6B show a wavelength of 650 nm (broken line), a wavelength of 550 nm (solid line), and a wavelength of 450 nm (dashed line), and astigmatism and coma aberration. Show tangential rays (T) and sagittal rays (S), respectively.
  • the main parameters of the projection optical system 10 are as follows. Magnification: 136.0 Overall composite focal length (fa): 2.70 mm F value: 2.5 Maximum angle of view (half angle of view): 77.66 degrees Image circle (first image plane, diameter): 24.05 mm Radius of curvature of first reflecting surface M1 (
  • the total length La of the projection optical system 10 indicates the distance along the optical axis 7 from the reduction-side surface S1 of the most reduction-side lens L1 to the first reflection surface M1, and the effective length of the first optical system 11
  • the length Le indicates the distance along the optical axis 7 from the surface S1 on the reduction side 2 of the lens L1 on the most reduction side 2 to the surface S27 on the expansion side 3 of the lens L15 on the most enlargement side 3, and the first optical system
  • a distance Lf from 11 to the first reflecting surface M1 indicates a distance along the optical axis 7 from the surface S27 on the magnifying side 3 of the lens L15 closest to the magnifying side 3 to the first reflecting surface M1.
  • the projection optical system 10 includes a first intermediate image formed by the first optical system 11 on the first side of the optical axis 7 inside the first optical system 11 by light incident from the reduction side 2.
  • IM1 is formed as a second intermediate image IM2 on the opposite side (second side) of the optical axis 7 on the magnification side 3 relative to the first optical system 11, and the magnification side 3 is larger than the second intermediate image IM2.
  • a first intermediate image IM1 is formed inside, and the first intermediate image IM1 is formed as a second intermediate image IM2 on the enlargement side 3, that is, on the input side (reduction side) 2 of the first reflecting surface M1.
  • the projection optical system 10 having the first optical system 11 can shorten the length along the optical axis 7 of the second intermediate image IM2 serving as the input of the first reflecting surface M1. For this reason, it is possible to arrange the first reflecting surface M1 that has a large refractive power and is compact, and it is possible to provide the projection optical system 10 that is compact, has a high magnification, and has a small slow ratio TR.
  • the first optical system 11 includes a first cemented lens B3 arranged in order from the reduction side 2 on the most enlargement side 3, and a first biconvex first positive lens L15.
  • a lens system LS1 is included.
  • a biconvex first positive lens L15 that has positive power on both sides and can exhibit relatively strong power on both sides is disposed at the most enlargement side 3, that is, the end of the enlargement side 3 of the first optical system 11.
  • the light beam 8 forming the second intermediate image IM2 is designed so as to cross the optical axis 7 mainly in the first lens system LS1 including the first positive lens L15 and the first cemented lens B3. it can.
  • 8 can be designed so as to mainly intersect with the optical axis 7 in the first lens system LS1 disposed at the end of the first optical system 11 on the enlargement side 3.
  • the light beam 8 gathers around the optical axis 7 in the first lens system LS1, and includes the first cemented lens B3 having a small lens diameter, including not only the central light but also the peripheral light, and the biconvex first lens system LS1. 1 positive lens L15. Therefore, the second intermediate image IM2 whose aberration is efficiently corrected by the lenses L13 to L15 included in the first lens system LS1 is formed in the vicinity of the enlargement side 3 of the first optical system 11 with a relatively small size. it can.
  • the ratio Le / La occupied by the first optical system 11 which is a refractive optical system with respect to the total length La of the projection optical system 10 can be increased.
  • 15 lenses L1 ⁇ L15 can be arranged. For this reason, the overall length La of the projection optical system 10 can be shortened, the slow ratio TR can be reduced, and the image quality projected on the screen 6 can be improved.
  • the ratio of the first optical system 11 that is a refractive optical system can be 50% or more, and an image with a well-corrected aberration can be obtained with a slow ratio TR of 0.19 or less (
  • the projection optical system 10 and the projector 1 including the projection optical system 10 can be arranged near the screen 6 and projected.
  • the second intermediate image IM2 can be formed near the first optical system 11, and the diameter of the enlargement side 3 of the first optical system 11 is reduced.
  • the first reflecting surface M1 that is large (the radius of curvature rm is small and the absolute value of the focal length is short) can be disposed near the first optical system 11.
  • the curvature radius rm of the first reflecting surface M1 satisfies the conditions (1), (2), and (3), and the first occupying the entire power of the projection optical system 10.
  • the power of the reflective surface M1 is sufficiently large, and the power of the first reflective surface M1 itself is sufficiently large.
  • the lens having the maximum effective diameter is the lens L13 on the most reduction side, and the effective diameter D23 of the surface S23 on the reduction side is 17 mm.
  • the lens with the maximum effective diameter of the second lens group G2 is the lens L10 on the most reduction side, and the effective diameter D17 of the reduction side surface S17 is 25.3 mm. Accordingly, in the second lens group G2, the diameter (effective diameter) of the first lens system LS1 disposed on the most enlargement side 3 is small, and the projection light is projected from the first reflecting surface M1 toward the screen 6.
  • a projector 1 that can prevent interference with the projector 19 and can project a large image in a compact manner.
  • the light beam 8 that forms the second intermediate image IM2 mainly intersects the optical axis 7 in the first lens system LS1
  • the light beam 8 that forms the second intermediate image IM2 is the first cemented lens.
  • the positions passing through B3 and the first positive lens L15 are dispersed with the optical axis 7 as the center, and these lenses L13 to L15 are in a state where aberrations can be easily corrected. Therefore, the first lens system LS1 including the first cemented lens B3 can satisfactorily correct not only chromatic aberration but also field curvature and astigmatism.
  • the first optical system 11 by selecting the power of the second lens group G2 that forms the second intermediate image IM2 from the first intermediate image IM1 so as to satisfy the condition (4), in the projection optical system 10 in which the first reflecting surface M1 has strong power, the second lens group G2 has sufficient power for aberration correction, and the first lens group G1 also has aberration correction. Can have the power of. Therefore, the first optical system 11 can perform a well-balanced aberration correction, and can provide the projection optical system 10 and the projector 1 that can project a high-quality image on the screen 6.
  • the first cemented lens B3 of the first lens system LS1 has a negative refractive power. While the light beam 8 concentrates and intersects with the optical axis 7 in the first lens system LS1, it is suitable for aberration correction, while tolerance sensitivity (error sensitivity, effect amount) for aberration correction by each lens is increased. That is, the projection optical system 10 has a design in which the aberration correction capability is likely to be different due to the manufacturing tolerance of each lens of the first lens system LS1 and the tolerance at the time of assembly in the first optical system 11.
  • the projection optical system 10 that can project a high image can be provided.
  • the surface S25 on the enlargement side 3 of the first cemented lens B3 facing the reduction surface 2 on the reduction side 2 of the biconvex first positive lens L15 of the first lens system LS1 is concave on the enlargement side 3. It has become a face of.
  • These surfaces S25 and S26 have the same curvature radius (curvature), and the distance between the surfaces S25 and S26, that is, the distance in the direction perpendicular to the optical axis 7 does not change significantly. Therefore, the tolerance sensitivity due to the combination of the lenses L13 to L15 constituting the first lens system LS1 can be further reduced, and the projection optical system 10 that projects an image with higher image quality more stably can be provided.
  • the first optical system 11 includes an intermediate lens L9 formed so as to straddle the first intermediate image IM1.
  • the space (effective length Le) of the first optical system 11 can be used more effectively, and a more compact projection optical system 10 can be provided.
  • the first intermediate image IM ⁇ b> 1 is formed to be inclined so as to approach the reduction side 2 when it is separated from the optical axis 7. That is, the proximal end that is the central light of the light beam 8 and is close to the optical axis 7 of the first intermediate image IM1 is located on the enlargement side 3 outside the intermediate lens L9, and is away from the optical axis 7 of the first intermediate image IM1.
  • the tip that is the peripheral light of the light beam 8 is located on the reduction side 2 outside the intermediate lens L9.
  • the first intermediate image IM1 is an image whose aberration is further corrected by the second lens group G2, and the first intermediate image IM1 straddles the intermediate lens L9, and the surface of the intermediate lens L9. Can be corrected by the second lens group G2. Therefore, since the first intermediate image IM1 straddles the intermediate lens L9, more lenses can be arranged on the effective length Le of the first optical system 11, and priority can be given to the improvement of aberration correction capability. .
  • the first intermediate image IM1 is inclined toward the reduction side 2, and the ambient light of the first intermediate image IM1 that is enlarged and projected further from the projection optical system 10 is transmitted to the second lens group G2.
  • aberration correction can be performed using the intermediate lens L9. Therefore, the projection optical system 10 and the projector 1 that project a higher quality image onto the screen 6 can be provided.
  • the lower limit of the condition (1) may be 45.5, and the upper limit may be 49.0.
  • the lower limit of condition (2) may be 6.25, and the upper limit may be 6.65.
  • the sag amount of the lens L8 can be reduced, and the lens L8 can be easily manufactured.
  • the lower limit of the condition (3) may be 16.5, and the upper limit may be 18.5.
  • the lower limit of the condition (4) may be 13.0, and the upper limit may be 15.0. Under these conditions, the sag amount of the lens L8 can be reduced, and the lens L8 can be easily manufactured.
  • the sag amount of the lens L8 can be reduced, and the lens L8 is manufactured. It becomes easy to do.
  • FIG. 7 shows another example of the projector.
  • the projector 1 also projects a projection optical system 10 that projects from the image plane (first image plane) 5a of the light modulator (light valve) 5 on the reduction side 2 onto the screen or wall surface (second image plane) on the enlargement side 3. including.
  • the projection optical system 10 includes a first optical system 11 including a plurality of lenses, and a second optical system 12 including a first reflecting surface M1 having a positive refractive power.
  • the first optical system 11 includes: The first intermediate image IM1 formed inside the first optical system 11 by the light incident from the reduction side 2 is formed as the second intermediate image IM2 on the enlargement side 3 with respect to the first optical system 11.
  • the first reflecting surface M1 projects the second intermediate image IM2 onto the second image surface as a video (final image).
  • the first optical system 11 includes a first lens group (first refractive optical system) G1 disposed on the reduction side (input side) 2 and an enlargement of the first lens group G1. And a second lens group (second refractive optical system) G2 disposed on the side (output side) 3.
  • the first lens group G1 includes an intermediate lens L9 that is formed on the most enlargement side 3 so that the first intermediate image IM1 straddles it.
  • the first lens group G1 includes lenses L1 to L9, and the basic configuration of each lens is the same as that of the projection optical system 10 shown in FIG.
  • the second lens group G2 includes lenses L10 to L15.
  • the basic configuration of each lens is a negative meniscus lens in which the lens L11 is convex on the enlargement side 3 and the lens L12 is a positive positive convex on the enlargement side 3. This is common except that it is a meniscus lens. Therefore, the first lens system LS1 includes the first lens system LS1 including the first cemented lens B3 and the first positive lens L15 on the most enlargement side 3.
  • the projection optical system 10 is also an interfocus type, and includes focusing groups LF1 to LF3.
  • FIG. 11 shows distances d10, d14, d16, and d22 indicating the positional relationship of the focusing groups LF1 to LF3 in the standard state (Pos1), the closest side (Pos2), and the infinite side (Pos3).
  • the focusing groups LF1, LF2 and LF3 are moved from the close side to the infinite side through the standard state, that is, as the distance between the mirror M1 and the screen 6 increases, from the reduction side 2 to the enlargement side 3, respectively.
  • the amount of movement varies depending on each group.
  • the smallest moving amount is the second focusing group LF2 including the intermediate lens L9 which is formed so as to straddle the first intermediate image IM1 and has a large effect amount (tolerance sensitivity) during focusing.
  • FIG. 12 (a) shows spherical aberration, astigmatism and distortion in the standard state
  • FIG. 12 (b) shows lateral aberration diagrams at various image heights in the standard state.
  • various aberrations including coma are corrected well, and a clear image can be projected onto the screen 6.
  • the main parameters of the projection optical system 10 of this embodiment are as follows. Magnification: 137.4 Overall composite focal length (fa): 2.70 mm F value: 2.5 Maximum angle of view (half angle of view): 77.75 degrees Image circle (first image plane, diameter): 24.05 mm Radius of curvature of first reflecting surface M1 (
  • the first optical system 11 forms a first intermediate image IM1 formed on the first side of the internal optical axis 7 on the enlargement side 3 with respect to the first optical system 11.
  • a second intermediate image IM2 is formed on the opposite side (second side) of the optical axis 7, and the first reflecting surface M1 projects the second intermediate image IM2 on the screen 6 in an enlarged manner.
  • the first optical system 11 includes a first cemented lens B3 arranged in order from the reduction side 2 on the most enlargement side 3, and a first biconvex first positive lens L15.
  • a lens system LS1 is included.
  • the second intermediate image IM2 whose aberration is efficiently corrected by the lenses L13 to L15 included in the first lens system LS1 is formed in the vicinity of the enlargement side 3 of the first optical system 11 with a relatively small size.
  • the first reflecting surface M1 having a large power (the radius of curvature rm is small and the absolute value of the focal length is short) is used as the first optical system. It can be placed near the system 11.
  • the curvature radius rm of the first reflecting surface M1 satisfies the conditions (1), (2), and (3), and the first occupying the entire power of the projection optical system 10.
  • the power of the reflective surface M1 is sufficiently large, and the power of the first reflective surface M1 itself is sufficiently large.
  • the first lens system LS1 disposed on the enlargement side 3 has the smallest diameter (effective diameter), and is projected from the first reflecting surface M1 toward the screen 6.
  • the conditions (5), (6), and (7) are satisfied, and the first optical system 11 that is a refractive optical system is the projection optical system 10 having a short total length La. It is possible to make the ratio occupied by 50% or more, and an image in which the aberration is corrected well includes the projection optical system 10 and the like so that the slow ratio TR is 0.19 or less.
  • the projector 1 can be projected near the screen 6. Furthermore, this projection optical system 10 also satisfies the conditions (8) to (10).
  • the power of the second lens group G2 is selected so as to satisfy the condition (4), and the second lens group G2 has sufficient power for aberration correction.
  • the first lens group G1 can also have power for aberration correction. Therefore, also in the first optical system 11, balanced aberration correction is possible, and the projection optical system 10 and the projector 1 that can project a high-quality image on the screen 6 can be provided.
  • the first cemented lens B3 of the first lens system LS1 has negative refractive power, and the surface S25 on the enlargement side 3 is a concave surface on the enlargement side 3. Therefore, it is possible to reduce the tolerance sensitivity due to the combination of the lenses L13 to L15 constituting the first lens system LS1, and it is possible to provide the projection optical system 10 that projects an image with higher image quality more stably.
  • the first optical system 11 also includes an intermediate lens L9 formed so as to straddle the first intermediate image IM1, and by using the effective length Le of the first optical system 11 more effectively, A more compact projection optical system 10 and projector 1 that project a higher quality image onto the screen 6 can be provided.
  • FIG. 13 shows another example of the projector.
  • the projector 1 also projects a projection optical system 10 that projects from the image plane (first image plane) 5a of the light modulator (light valve) 5 on the reduction side 2 onto the screen or wall surface (second image plane) on the enlargement side 3. including.
  • the projection optical system 10 includes a first optical system 11 including a plurality of lenses, and a second optical system 12 including a first reflecting surface M1 having a positive refractive power.
  • the first optical system 11 includes: The first intermediate image IM1 formed inside the first optical system 11 by the light incident from the reduction side 2 is formed as the second intermediate image IM2 on the enlargement side 3 with respect to the first optical system 11.
  • the first reflecting surface M1 projects the second intermediate image IM2 onto the second image surface as a video (final image).
  • the first optical system 11 includes a first lens group (first refractive optical system) G1 disposed on the reduction side (input side) 2 and a first lens group G1. And a second lens group (second refractive optical system) G2 disposed on the enlargement side (output side) 3.
  • the first lens group G1 includes an intermediate lens L9 that is formed on the most enlargement side 3 so that the first intermediate image IM1 straddles it.
  • the first lens group G1 includes lenses L1 to L9, and the basic configuration of each lens is the same as that of the projection optical system 10 shown in FIG.
  • the second lens group G2 includes lenses L10 to L15, and the basic configuration of each lens is common to the projection optical system 10 shown in FIG.
  • the first lens system 11 also includes a first lens system LS1 including a first cemented lens B3 and a first positive lens L15 on the most enlargement side 3.
  • the projection optical system 10 is also an interfocus type, and includes focusing groups LF1 to LF3.
  • FIG. 17 shows distances d10, d14, d16, and d22 indicating the positional relationship of the focusing groups LF1 to LF3 in the standard state (Pos1), the closest side (Pos2), and the infinite side (Pos3).
  • the focusing groups LF1, LF2 and LF3 are moved from the close side to the infinite side through the standard state, that is, as the distance between the mirror M1 and the screen 6 increases, from the reduction side 2 to the enlargement side 3, respectively.
  • the amount of movement varies depending on each group.
  • the smallest moving amount is the second focusing group LF2 including the intermediate lens L9 which is formed so as to straddle the first intermediate image IM1 and has a large effect amount (tolerance sensitivity) during focusing.
  • FIG. 18 (a) shows spherical aberration, astigmatism and distortion in the standard state
  • FIG. 18 (b) shows lateral aberration diagrams at various image heights in the standard state.
  • various aberrations including coma are corrected well, and a clear image can be projected onto the screen 6.
  • the main parameters of the projection optical system 10 of this embodiment are as follows. Magnification: 136.8 Overall composite focal length (fa): 2.70 mm F value: 2.5 Maximum angle of view (half angle of view): 77.73 degrees Image circle (first image plane, diameter): 24.05 mm Radius of curvature of first reflective surface M1 (
  • Condition (5) (Le / La): 0.69
  • Condition (6) (TR): 0.183
  • Condition (7) (Lf / La): 0.31
  • the first optical system 11 forms a first intermediate image IM1 formed on the first side of the internal optical axis 7 on the enlargement side 3 with respect to the first optical system 11.
  • a second intermediate image IM2 is formed on the opposite side (second side) of the optical axis 7, and the first reflecting surface M1 projects the second intermediate image IM2 on the screen 6 in an enlarged manner.
  • the first optical system 11 includes a first cemented lens B3 arranged in order from the reduction side 2 on the most enlargement side 3, and a first biconvex first positive lens L15.
  • a lens system LS1 is included.
  • the projection optical system 10 also satisfies the conditions (1) to (10), and it is possible to provide the projection optical system 10 and the projector 1 capable of projecting a compact and high-quality large image from the vicinity of the screen 6.
  • the first optical system 11 also includes an intermediate lens L9 formed so as to straddle the first intermediate image IM1, and by using the effective length Le of the first optical system 11 more effectively, A more compact projection optical system 10 and projector 1 that project a higher quality image onto the screen 6 can be provided.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Projection Apparatus (AREA)

Abstract

L'invention concerne un système optique de projection (10) qui projette une image à partir d'un premier plan d'image au niveau d'un côté de réduction sur un second plan d'image au niveau d'un côté grossissement. Ce système optique de projection (10) comprend : un premier système optique (11) qui comprend une pluralité de lentilles et qui forme, à partir d'une première image intermédiaire (IM1) formée au niveau d'un premier côté d'un axe optique à l'intérieur dudit premier système optique au moyen d'une lumière entrant depuis le côté de réduction, une seconde image intermédiaire (IM2) sur un second côté de l'axe optique, qui est situé plus près du côté grossissement que ledit premier système optique; et un second système optique (12) qui comprend un premier plan de réflexion qui a une réfringence positive et qui est situé plus près du côté grossissement que la seconde image intermédiaire. Le premier système optique (11) comprend, sur le côté le plus à grossissement, un premier système de lentilles (LS1) comprenant une première lentille collée (B3) et une première lentille positive (L15) dans une forme biconvexe qui sont disposées de manière séquentielle à partir du côté de réduction.
PCT/JP2017/045877 2016-12-21 2017-12-21 Système optique de projection et projecteur WO2018117210A1 (fr)

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WO2021241297A1 (fr) * 2020-05-27 2021-12-02 ソニーグループ株式会社 Dispositif d'affichage d'image et système optique de projection
WO2023186627A1 (fr) 2022-03-31 2023-10-05 Carl Zeiss Jena Gmbh Dispositif d'affichage transparent
DE102022107677A1 (de) 2022-03-31 2023-10-05 Carl Zeiss Jena Gmbh Transparente Anzeige
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WO2023237558A1 (fr) 2022-06-08 2023-12-14 Carl Zeiss Jena Gmbh Affichage transparent

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