WO2018179607A1 - Système optique de projection, appareil de projection d'image et système de projection d'image - Google Patents

Système optique de projection, appareil de projection d'image et système de projection d'image Download PDF

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Publication number
WO2018179607A1
WO2018179607A1 PCT/JP2017/044305 JP2017044305W WO2018179607A1 WO 2018179607 A1 WO2018179607 A1 WO 2018179607A1 JP 2017044305 W JP2017044305 W JP 2017044305W WO 2018179607 A1 WO2018179607 A1 WO 2018179607A1
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optical system
projection
lens
projection optical
lenses
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PCT/JP2017/044305
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English (en)
Japanese (ja)
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恒夫 内田
克 山田
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パナソニックＩｐマネジメント株式会社
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Publication of WO2018179607A1 publication Critical patent/WO2018179607A1/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 disclosure relates to a projection optical system for projecting an image generated by an image display element.
  • Patent Document 1 discloses a projection apparatus using a projection optical system including a reflecting surface.
  • the projection optical system is a projection optical system for enlarging and projecting an image formed on the light valve onto a projection surface, and includes a lens optical system, a first reflection surface, and a second reflection surface.
  • the lens optical system includes a plurality of lenses, and has a positive power for forming an intermediate image of an image between the projection surface and the light valve.
  • the first reflecting surface reflects the divergent light beam after forming the intermediate image and has a positive power to form an image on the projection surface.
  • the second reflecting surface causes the light emitted from the lens optical system to enter the first reflecting surface. As a result, a large screen with reduced chromatic aberration and distortion can be projected.
  • the present disclosure provides a projection optical system that can reduce image distortion while being small in size.
  • a projection optical system is a projection optical system that is used for projecting an image on a projection surface and has a conjugate relationship between a reduction-side image plane and a projection-side image plane.
  • An optical system and a reflective optical system are provided.
  • the transmission optical system includes an aperture stop and a plurality of lenses each having power.
  • the reflection optical system reflects the light emitted from the transmission optical system.
  • the principal ray of the reference ray is a ray that passes through the center of the aperture stop among the rays that are projected closest to the projection optical system on the projection surface.
  • the projection optical system has an intermediate image plane conjugate with the reduction-side image plane between the transmission optical system and the reflection optical system, and satisfies the following conditional expression (1).
  • Tl is the distance from the most reduced lens among the plurality of lenses to the lens closest to the projection surface among the plurality of lenses.
  • Pex is the maximum distance among the optical path lengths of the principal rays of the reference rays from the exit pupil position of the transmission optical system with reference to the principal ray of the reference rays to the lens closest to the projection surface among the plurality of lenses. .
  • An image projection apparatus includes the above-described projection optical system and an image forming element that forms an image and has an image display surface as a reduction-side image surface.
  • the image projection device can be reduced in size and image distortion can be reduced.
  • FIG. 1 is a diagram illustrating an image projection system according to the present disclosure.
  • FIG. 2 is a configuration diagram illustrating an image projection apparatus according to the present disclosure.
  • FIG. 3 is a configuration diagram of a transmission optical system in Numerical Example 1.
  • FIG. 4 is a configuration diagram of a transmission optical system in Numerical Example 2.
  • FIG. 5 is a configuration diagram of a transmission optical system in Numerical Example 3.
  • FIG. 6 is a configuration diagram of a transmission optical system in Numerical Example 4.
  • FIG. 7 is a configuration diagram of a transmission optical system in Numerical Example 5.
  • FIG. 1 is a diagram illustrating an image projection system 1 according to the present disclosure.
  • the image projection system 1 includes an image projection device 10 and a screen SC (an example of a projection surface).
  • the image projection apparatus 10 includes a projection optical system 100, an image display element 130, and a transmission element 140.
  • the projection optical system 100 includes a transmission optical system 110 and a reflection optical system 120.
  • the image projection device 10 projects the image formed by the image display element 130 onto the screen SC in a direction (diagonal direction) that does not face the image.
  • the direction in which the screen SC does not face is that the direction of the normal line at the point on the screen SC where the reference ray R reaches and the principal ray optical path of the reference ray R emitted from the final surface of the projection optical system 100. Say when the direction does not match.
  • a straight line connecting the rotationally symmetric axes of the lens elements arranged on the enlargement side is defined as an optical axis AZ.
  • the optical axis AZ may be an axis that shares the most lens centers.
  • the optical axis AZ may be set at a position eccentric with respect to the image display element 130 in a plane including the optical path of the emitted light.
  • the optical path of the emitted light means the optical path of the principal ray from the center of the image display element 130 to the center of the enlarged image on the screen SC in the optical path from the image display element 130 to the screen SC.
  • the reduction side means the image display element 130 side in the projection optical system 100.
  • the enlargement side means the screen SC side in the projection optical system 100.
  • the principal ray of the reference ray R is a ray that passes through the center of the aperture stop A among the rays that are projected closest to the projection optical system 100 of the screen SC.
  • the optical axis AZ is an extension of the optical axis of the optical system after being reflected and bent by the reflecting surface. It may be set as a line.
  • the image projection apparatus 10 projects an image on a screen SC having a curvature.
  • FIG. 2 is a configuration diagram illustrating the image projection device 10 of the present disclosure.
  • the projection optical system 100 includes a transmission optical system 110 having a positive power as a whole and a reflection optical system 120 having a positive power as a whole.
  • the principal ray of the reference ray R passing through the center of the aperture stop A does not intersect the optical axis AZ between the image plane on the reduction side and the aperture stop A.
  • the transmission optical system 110 includes a first lens group G1 having positive power, a second lens group G2 having positive power, a third lens group G3 having positive power, and a fourth lens having positive power. It consists of a group G4 and a prism PB.
  • the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 are arranged in order from the image display element 130 to the screen SC.
  • the prism PB is disposed between the image display element 130 and the first lens group G1. In the present disclosure, the prism PB has no power. Therefore, for example, in the transmission optical system 110 of FIG. 3, the plurality of lenses having power means the lens elements L1 to L14.
  • the first lens group G1 includes a first lens element L1 that is a single biconvex lens having a rotationally symmetric axis.
  • the first lens element L1 has an aspheric shape.
  • the second lens group G2 includes a second lens element L2, a third lens element L3, a fourth lens element L4, and a fifth lens element L5.
  • the second lens element L2 has a rotationally symmetric axis and has a negative meniscus shape.
  • the convex surface of the second lens element L2 faces the reduction side.
  • the third lens element L3 has a rotationally symmetric axis and has a biconvex shape.
  • the fourth lens element L4 has a rotationally symmetric axis and has a biconcave shape.
  • the fifth lens element L5 has a rotationally symmetric axis and has a biconvex shape.
  • the second lens element L2, the third lens element L3, and the fourth lens element L4 are cemented with each other.
  • the third lens group G3 includes an aperture stop A and has a positive power as a whole.
  • the third lens group G3 includes a sixth lens element L6, a seventh lens element L7, an eighth lens element L8, a ninth lens element L9, and a tenth lens element L10.
  • the sixth lens element L6 is disposed on the enlargement side with respect to the aperture stop A, has a rotationally symmetric axis, and has a positive meniscus shape.
  • the convex surface of the sixth lens element L6 faces the enlargement side.
  • the seventh lens element L7 (negative meniscus lens) has a rotationally symmetric axis and has a negative meniscus shape.
  • the convex surface of the seventh lens element L7 faces the enlargement side.
  • the eighth lens element L8 has a rotationally symmetric axis and has a positive meniscus shape.
  • the convex surface of the eighth lens element L8 faces the reduction side.
  • the ninth lens element L9 has a rotationally symmetric axis and has a biconvex shape.
  • the tenth lens element L10 has a rotationally symmetric axis and has a negative meniscus shape.
  • the convex surface of the tenth lens element L10 faces the enlargement side.
  • the fourth lens group G4 is arranged closest to the screen SC among the lens groups of the transmission optical system 110.
  • the fourth lens group G4 includes an eleventh lens element L11, a twelfth lens element L12, a thirteenth lens element L13, and a fourteenth lens element L14.
  • the eleventh lens element L11, the twelfth lens element L12, the thirteenth lens element L13, and the fourteenth lens element L14 are arranged in order from the image display element 130 to the screen SC.
  • the eleventh lens element L11 has a rotationally symmetric axis and has positive power.
  • the convex surface of the eleventh lens element L11 faces the reduction side.
  • the twelfth lens element L12 has a rotationally symmetric axis and has negative power.
  • the concave surface of the twelfth lens element L12 faces the enlargement side.
  • the thirteenth lens element L13 has a rotationally symmetric axis and has a biconcave shape.
  • the fourteenth lens element L14 has a rotationally symmetric axis and has a positive meniscus shape.
  • the convex surface of the fourteenth lens element L14 faces the enlargement side.
  • the eleventh lens element L11 and the twelfth lens element L12 are cemented with each other.
  • the thirteenth lens element L13 and the fourteenth lens element L14 are lens elements having an aspherical shape.
  • the third lens group G3 includes an aperture stop A and has a positive power as a whole.
  • the third lens group G3 includes a sixth lens element L6, a seventh lens element L7, an eighth lens element L8, a ninth lens element L9, and a tenth lens element L10.
  • the sixth lens element L6 is disposed on the enlargement side with respect to the aperture stop A, has a rotationally symmetric axis, and has a positive meniscus shape.
  • the convex surface of the sixth lens element L6 faces the enlargement side.
  • the seventh lens element L7 (negative meniscus lens) has a rotationally symmetric axis and has a negative meniscus shape.
  • the convex surface of the seventh lens element L7 faces the enlargement side.
  • the eighth lens element L8 has a rotationally symmetric axis and has positive power.
  • the convex surface of the eighth lens element L8 faces the reduction side.
  • the ninth lens element L9 has a rotationally symmetric axis and has a biconcave shape.
  • the tenth lens element L10 has a rotationally symmetric axis and has a biconvex shape.
  • the ninth lens element L9 and the tenth lens element L10 are cemented with each other.
  • the fourth lens group G4 is disposed closest to the screen SC in the transmission optical system 110.
  • the fourth lens group G4 includes an eleventh lens element L11, a twelfth lens element L12, and a thirteenth lens element L13.
  • the eleventh lens element L11, the twelfth lens element L12, and the thirteenth lens element L13 are arranged in order from the image display element 130 to the screen SC.
  • the eleventh lens element L11 has a rotationally symmetric axis and has a positive meniscus shape.
  • the convex surface of the eleventh lens element L11 faces the reduction side.
  • the twelfth lens element L12 has a rotationally symmetric axis and has a biconcave shape.
  • the thirteenth lens element L13 has a rotationally symmetric axis and has a positive meniscus shape.
  • the convex surface of the thirteenth lens element L13 faces the enlargement side.
  • the twelfth lens element L12 and the thirteenth lens element L13 are lens elements having an aspherical shape.
  • the lens adjacent to the image display element 130 side of the most projected side lens or a part of the lens elements constituting the fourth lens group G4 has a biconcave shape. It is desirable that at least one surface of the biconcave lens has an aspherical shape. Specifically, this aspherical shape is a shape in which the curvature decreases with increasing distance from the center of the lens in the radial direction. That is, this aspherical shape is a shape in which the power on the outer side of the lens is smaller than that on the lens center side.
  • the third lens element L3 (positive lens) may have the strongest positive power among the lens elements.
  • the fourth lens element L4 (negative lens) may have the strongest negative power among the lens elements. 3 to 7, the third lens element L3 and the fourth lens element L4 are joined, but they may be arranged adjacent to each other without being joined.
  • the projection optical system 100 is focused by two lens groups, the second lens group G2 and the fourth lens group G4.
  • the fourth lens group G4 includes at least one aspheric surface, and suppresses image distortion and resolution degradation that occur during focusing. Thereby, good optical performance can be satisfied even if the projection distance changes.
  • the projection optical system 100 uses a part of the lens elements or a plurality of lens elements on the enlargement side of the aperture stop A as a focus group, thereby suppressing image distortion and resolution degradation that occur during focusing. It is also possible. Thereby, good optical performance can be satisfied even if the projection distance changes.
  • the concave surface of the positive meniscus-shaped maximum magnification side lens and the concave surface on the expansion side of the negative meniscus lens or the negative lens element joined to the positive lens element face each other. Yes.
  • the fourth lens group G4 has the most projection side lens on the most screen SC side.
  • the most projection side lens has a shape with the largest thickness deviation ratio in the transmission optical system 110. As a result, the difference in refractive power between the center and the periphery of the transmitted light beam can be increased, which is effective in correcting field curvature.
  • an effect can be expected to reduce the height of the transmission optical system 110.
  • a part of the lens elements away from the aperture stop A such as a lens element arranged on the reduction side and a lens element arranged on the enlargement side, a further reduction in height can be expected. Note that the cut lens element does not have a rotationally symmetric axis.
  • An intermediate image plane I (see FIG. 2) is formed between the transmission optical system 110 and the screen SC. This makes it possible to employ a concave mirror as a part of the reflective optical system 120, which is advantageous for enlarging the projection area and reducing the size of the reflective optical system 120. Further, the intermediate image plane I formed by the transmission optical system 110 has a characteristic that an image point formed by a light ray closest to the optical axis AZ is formed at a position farthest from the transmission optical system 110. The intermediate image plane I is preferably formed at a position that does not straddle the reflection surface of the reflection optical system 120.
  • the reflection optical system 120 reflects the light beam emitted from the transmission optical system 110 and projects the reflected light beam onto the screen SC.
  • the reflective optical system 120 includes two mirrors, a first mirror 121 (an example of a concave mirror) and a second mirror 122 (an example of a plane mirror).
  • the reflecting surface of the first mirror 121 has a concave free-form surface.
  • the first mirror 121 has a positive power as a whole.
  • the reflection optical system 120 only needs to be composed of one or more mirrors, and is not limited to being composed of two mirrors.
  • the image display element 130 forms an image to be projected on the screen SC based on the image signal.
  • a spatial modulation element such as a DMD (Digital Micromirror Device) or a transmissive or reflective liquid crystal panel can be used.
  • the image display element 130 according to the present disclosure is a rectangle having a long side in the X-axis direction (perpendicular to the paper surface) in FIG. 2 and a short side in the Y-axis direction.
  • the transmissive element 140 is disposed between the reflective optical system 120 and the screen SC.
  • the light beam reflected by the reflective optical system 120 is transmitted through the transmissive element 140 and projected onto the screen SC.
  • the shape of the transmissive element 140 is a toroidal shape having different curvatures in a direction corresponding to the long side direction of the image display element 130 and a direction corresponding to the short side direction.
  • the convex surface of the transmissive element 140 faces the screen SC side. That is, the curvature in the X-axis direction (perpendicular to the paper surface in FIG. 2) corresponding to the long side direction of the image display element 130 on the incident surface of the transmission element 140 is larger than the curvature in the Y-axis direction corresponding to the short side direction.
  • the first mirror 121 on the image display element 130 side preferably has a free-form surface shape. Since the first mirror 121 has a free-form surface having a positive power, it is possible to suppress the height of light incident on the second mirror 122 while correcting image distortion. Therefore, it is advantageous for downsizing.
  • a projection optical system 100 is a projection optical system that is used for projecting an image on a screen SC and has a conjugate relationship between a reduction-side image plane and a screen SC-side image plane.
  • a transmission optical system 110 and a reflection optical system 120 are provided.
  • the transmission optical system 110 includes an aperture stop A and a plurality of lenses each having power.
  • the reflection optical system 120 reflects light emitted from the transmission optical system 110.
  • the principal ray of the reference ray R is a ray that passes through the center of the aperture stop A among the rays that are projected closest to the projection optical system 100 of the screen SC.
  • the projection optical system 100 has an intermediate image plane I conjugate with the reduction-side image plane between the transmission optical system 110 and the reflection optical system 120.
  • this configuration is referred to as a basic configuration of the embodiment.
  • the projection optical system 100 preferably satisfies the following conditional expression (1).
  • Tl is the distance from the most reduction side lens to the most screen SC side lens.
  • is the maximum distance in the optical path length of the principal ray of the reference ray R from the exit pupil position of the transmission optical system 110 with respect to the principal ray of the reference ray R to the lens closest to the screen SC.
  • Conditional expression (1) defines a preferable range between the exit pupil position and the total length with the principal ray of the reference ray R of the transmission optical system 110 as a reference (the optical axis of the ray).
  • the reference light beam R is a light beam projected by the image projection apparatus 10 including the projection optical system 100 to the foremost side of the screen SC.
  • the projection optical system 100 preferably satisfies the following conditional expression (2).
  • Conditional expression (2) defines a preferable range of the entrance pupil position and the total length with the principal ray of the reference ray R of the transmission optical system 110 as a reference (the optical axis of the ray).
  • / Tl falls below the lower limit of the conditional expression (2), the angle of light incident from the image plane increases, and the light loss when the DMD is used as the display element becomes significant. Therefore, it becomes difficult to maintain the illuminance distribution uniformity on the screen SC.
  • / Tl exceeds the upper limit of the conditional expression (2), the total length of the transmission optical system 110 with respect to the projection optical system 100 becomes short, and it becomes difficult to maintain the field curvature well.
  • the projection optical system 100 preferably satisfies the following conditional expression (3).
  • Rf is the maximum focal length of the transmission optical system 110 based on the principal ray of the reference ray R.
  • Conditional expression (3) defines a preferable range between the focal length of the transmission optical system 110 and the total length with the principal ray of the reference ray R as a reference (the optical axis of the ray).
  • Tl / Rf falls below the lower limit of the conditional expression (3), the total length of the transmission optical system 110 becomes short, and it becomes difficult to maintain sufficient optical performance as the projection optical system 100.
  • the intermediate image plane I of the transmission optical system 110 is formed at a position away from the transmission optical system 110, the reflection optical system 120 becomes large, which is disadvantageous for downsizing the projection optical system 100.
  • Tl / Rf exceeds the upper limit of the conditional expression (3), the total length of the transmission optical system 110 is increased, which is disadvantageous for downsizing of the projection optical system 100.
  • the projection optical system 100 preferably satisfies the following conditional expression (4).
  • Conditional expression (4) defines a suitable range of the exit pupil position and the total length with reference to the optical axis AZ of the transmission optical system 110.
  • / Tl satisfies the conditional expression (4), it is possible to obtain a projection optical system 100 that is small in size and reduced in image distortion.
  • / Tl exceeds the upper limit of the conditional expression (4), the projection optical system 100 has a configuration close to a telecentric optical system. However, if the curvature of field is appropriately corrected, the size of the transmission optical system 110 increases, which is disadvantageous for downsizing the projection optical system 100.
  • the projection optical system 100 preferably satisfies the following conditional expression (5).
  • Conditional expression (5) defines a suitable range of the entrance pupil position and the total length with reference to the optical axis AZ of the transmission optical system 110.
  • / Tl is less than the lower limit of the conditional expression (5), the angle of light incident from the image plane becomes large, and the light amount loss becomes significant when DMD is used as a display element. Therefore, it becomes difficult to maintain the illuminance distribution uniformity on the screen SC.
  • / Tl exceeds the upper limit of the conditional expression (5), the total length of the transmission optical system 110 with respect to the projection optical system 100 becomes short, and it becomes difficult to maintain the field curvature well.
  • Tables 1 to 5 show corresponding values of the conditional expressions obtained for the projection optical systems according to Numerical Examples 1 to 5. As shown in each table, for
  • the unit of length in the data is “mm”, and the unit of angle of view is “°”.
  • r is a radius of curvature
  • d is a surface interval
  • nd is a refractive index with respect to the d line
  • vd is an Abbe number with respect to the d line.
  • the surface marked with * is an aspherical surface or a free-form surface, and the aspherical shape is defined by the following equation.
  • z sag amount of the plane parallel to the z-axis
  • c curvature at the surface vertex
  • k conic coefficient
  • the lens constituent length is the distance from the first surface to the end surface
  • the front principal point position is the distance from the first surface
  • the rear principal point position is from the first surface. Is the distance.
  • 80 inches means a wide angle
  • 100 inches means a middle
  • 50 inches means telephoto.
  • FIG. 3 is a configuration diagram of the transmission optical system 110 in Numerical Example 1.
  • FIG. 4 is a configuration diagram of the transmission optical system 110 in Numerical Example 2.
  • FIG. 5 is a configuration diagram of the transmission optical system 110 in Numerical Example 3.
  • FIG. 6 is a configuration diagram of the transmission optical system 110 in Numerical Example 4.
  • FIG. 7 is a configuration diagram of the transmission optical system 110 in Numerical Example 5.
  • Tables 6 to 11 below show specific data of the transmission optical system 110 of Numerical Example 1.
  • the slow ratio in Numerical Example 1 is 0.175.
  • the projection magnification is 112.75 to 217.06.
  • the size of the image display element 130 to be used is 9.856 mm in the long side direction and 6.162 mm in the short side direction.
  • the image display element 130 is shifted in the +1.23 mm Y direction with respect to the R1 surface apex of the first lens element L1.
  • the zoom data is shown in Table 8 below.
  • the zoom ratio is 0.94855.
  • the single lens data is shown in Table 9 below.
  • the lens group data is shown in Table 10 below.
  • the zoom lens group magnification is shown in Table 11 below.
  • Tables 12 to 17 below show specific data of the transmission optical system 110 of Numerical Example 2.
  • the slow ratio in Numerical Example 2 is 0.177.
  • the projection magnification is 112.76 to 217.11.
  • the size of the image display element 130 to be used is 9.856 mm in the long side direction and 6.162 mm in the short side direction.
  • the image display element 130 is shifted in the +1.23 mm Y direction with respect to the R1 surface apex of the first lens element L1.
  • Table 12 below shows surface data of each optical element in Numerical Example 2.
  • the zoom data is shown in Table 14 below.
  • the zoom ratio is 0.92143.
  • the lens group data is shown in Table 16 below.
  • the zoom lens group magnification is shown in Table 17 below.
  • the zoom data is shown in Table 20 below.
  • the zoom ratio is 0.99414.
  • the lens group data is shown in Table 22 below.
  • zoom lens group magnifications are shown in Table 23.
  • Tables 24 to 29 below show specific data of the transmission optical system 110 according to Numerical Example 4.
  • the slow ratio in Numerical Example 4 is 0.194.
  • the projection magnification is 112.92 to 216.97 times.
  • the size of the image display element 130 to be used is 9.856 mm in the long side direction and 6.162 mm in the short side direction.
  • the image display element 130 is shifted in the +0.74 mm Y direction with respect to the R1 surface apex of the first lens element L1.
  • Table 25 shows the aspheric data.
  • the zoom data is shown in Table 26 below.
  • the zoom ratio is 1.003324.
  • Table 27 shows single lens data.
  • the lens group data is shown in Table 28 below.
  • zoom lens group magnifications are shown in Table 29.
  • Tables 30 to 35 below show specific data of the transmission optical system 110 of Numerical Example 5.
  • the slow ratio in Numerical Example 5 is 0.164.
  • the projection magnification is 112.85 to 217.06 times.
  • the size of the image display element 130 to be used is 9.856 mm in the long side direction and 6.162 mm in the short side direction.
  • the image display element 130 is shifted in the +1.24 mm Y direction with respect to the R1 surface apex of the first lens element L1.
  • Table 30 below shows surface data of each optical element in Numerical Example 5.
  • the zoom data is shown in Table 32 below.
  • the zoom ratio is 0.99046.
  • the lens group data is shown in Table 34 below.
  • zoom lens group magnifications are shown in Table 35.
  • the present disclosure can be applied to a projection optical system for projecting an image displayed on an image display element.
  • the present disclosure is applicable to a projector, a head-up display, and the like.

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Abstract

Ce système optique de projection (100) est un système optique de projection, qui est utilisé pour projeter une image sur une surface projetée (SC) et établit une relation conjuguée entre un plan d'image sur un côté de réduction et un plan d'image sur un côté de surface projetée (SC), le système optique de projection (100) étant pourvu d'un système optique transmissif (110) et d'un système optique réfléchissant (120). Le système optique transmissif (110) comprend un diaphragme d'ouverture et une pluralité de lentilles ayant chacune une puissance. Le système optique réfléchissant (120) réfléchit un faisceau émis par le système optique transmissif (110). Un faisceau principal dans un faisceau de référence est le faisceau qui passe à travers le centre du diaphragme d'ouverture parmi des faisceaux projetés sur la partie qui, sur la surface projetée (SC), est le plus proche du système optique transmissif (100). Le système optique de projection (100) a un plan d'image intermédiaire, qui a une relation conjuguée avec le plan d'image du côté de réduction, entre le système optique transmissif (110) et le système optique réfléchissant (120), et satisfait 0.70<|Pex|/Tl<40.
PCT/JP2017/044305 2017-03-29 2017-12-11 Système optique de projection, appareil de projection d'image et système de projection d'image WO2018179607A1 (fr)

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JP2014170127A (ja) * 2013-03-04 2014-09-18 Ricoh Co Ltd 投射光学系と画像表示装置
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WO2006043666A1 (fr) * 2004-10-21 2006-04-27 Sony Corporation Système optique de projection et affichage d’image de type projection
JP2013064816A (ja) * 2011-09-16 2013-04-11 Ricoh Co Ltd 画像表示装置
JP2014170127A (ja) * 2013-03-04 2014-09-18 Ricoh Co Ltd 投射光学系と画像表示装置
JP2014170186A (ja) * 2013-03-05 2014-09-18 Ricoh Co Ltd 投射光学系およびプロジェクタ
WO2018008199A1 (fr) * 2016-07-04 2018-01-11 パナソニックＩｐマネジメント株式会社 Système optique de projection et dispositif de projection d'images

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