WO2016143061A1 - 投写型映像表示装置 - Google Patents
投写型映像表示装置 Download PDFInfo
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- WO2016143061A1 WO2016143061A1 PCT/JP2015/056962 JP2015056962W WO2016143061A1 WO 2016143061 A1 WO2016143061 A1 WO 2016143061A1 JP 2015056962 W JP2015056962 W JP 2015056962W WO 2016143061 A1 WO2016143061 A1 WO 2016143061A1
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- lens
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- image
- mirror
- projection
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/022—Mountings, adjusting means, or light-tight connections, for optical elements for lenses lens and mount having complementary engagement means, e.g. screw/thread
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/28—Reflectors in projection beam
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/30—Details adapted to collapse or fold, e.g. for portability
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/147—Optical correction of image distortions, e.g. keystone
Definitions
- the present invention relates to a projection display apparatus using a lens or a reflection mirror formed by plastic injection molding.
- Patent Document 1 includes a projection lens including a first optical system including a transmissive refractive element and a second optical system including a reflective refracting element.
- a projection optical device is disclosed that is housed in a lower space whose lower limit is the lower end of the optical system.
- Patent Document 2 discloses a projection type video display device that can project a good projection image with a large image in a short distance by combining a lens system and a concave mirror.
- a projection image can be projected favorably with a large image by combining a lens system and a concave mirror in the projection optical system of the projection display apparatus.
- a plastic lens having a symmetrical shape with respect to the optical axis of the lens is assumed as a lens constituting the lens system, and a problem that occurs when the plastic lens is molded. There is no description about the solution.
- the object of the present invention is different from a plastic lens having a symmetric shape with respect to the optical axis of the lens, and a problem that arises when molding a lens or a mirror having an asymmetric and complicated shape used in combination with a convex mirror. And to provide a projection display apparatus having excellent characteristics at a relatively low cost.
- the present application includes a plurality of means for solving the above-mentioned problem.
- a projection-type image display apparatus that projects an enlarged image light obtained by modulating light from a light source with a light modulation unit,
- An inclined projection optical system for enlarging and projecting the modulated image light the inclined projection optical system including a plurality of lens elements and a reflecting mirror having a convex shape with respect to the image projection surface;
- the outer center of one or more lens elements arranged closest to the reflection mirror is located above the optical axis shared by other lens elements, and the reflection mirror is the reflection mirror.
- the shape of the reflecting surface perpendicular to the image projection plane including the optical axis of the image is connected at the center of the image projection plane with respect to the average radius of curvature of the region through which the light beam imaged on the upper end of the image projection plane passes.
- Average curvature of the area through which the luminous flux passes The lens element, which is formed so as to have a small diameter and is located closest to the reflecting mirror, has an average horizontal cross-section on the image projection surface of the lens surface facing the reflecting mirror at the upper end.
- the radius of curvature has a shape larger than the average radius of curvature of a region through which a light beam formed at the center of the image projection surface of the same lens surface passes.
- FIG. 1 is a perspective view showing an overall appearance of a projection display apparatus according to an embodiment of the present invention. It is a lens arrangement
- FIG. 2 is a diagram illustrating an outer shape of a free-form surface lens (L11) according to an embodiment, and (A) to (E) are respectively a front perspective view, a rear perspective view, a front view, a side view, and It is a rear view.
- FIG. 2 is a diagram showing an outer shape of a free-form surface lens (L12) according to an embodiment, and (A) to (E) are respectively a front perspective view, a rear perspective view, a front view, a side view, and It is a rear view.
- FIG. 2 is a diagram showing an outer shape of a free-form curved mirror (M13) according to an embodiment, and (A) to (C) are a front view, a side view, and a rear view, respectively. It is explanatory drawing for demonstrating the structure and design method of the free-form surface lens (L11) of one Embodiment. It is explanatory drawing for demonstrating the structure and design method of the free-form surface lens (L12) of one Embodiment.
- FIG. 7 is a diagram showing the shape of a conventional first free-form surface lens for comparison with an embodiment, and (A) to (D) are a perspective view, a plan view, a side view, and a side sectional view, respectively.
- FIG. 8 is a diagram showing the shape of a conventional second free-form surface lens for comparison with the embodiment, and (A) to (D) are a perspective view, a plan view, a side view, and a side sectional view, respectively. .
- a free-form surface lens and a free-form surface mirror will be used as an example of an asymmetric and complicated lens and mirror.
- FIG. 1 is a perspective view showing the overall appearance of a projection display apparatus according to an embodiment using a free-form surface lens according to an embodiment of the present invention in combination with a concave mirror.
- reference numeral 100 denotes a projection display apparatus
- 101 denotes a top cover of the projection display apparatus 100
- 102 denotes a bottom cover.
- a window 103 that is opened when the projection display apparatus 100 is used is attached to a part of the top cover 101 so as to be opened and closed.
- a state in which the window portion 103 is opened is shown, and a free-form surface lens constituting a projection optical system described below is indicated by L12.
- components for configuring the projection display apparatus 100 are mounted in an internal space formed by the upper surface cover 101 and the lower surface cover 102.
- the components include, for example, a lamp that is a light source, a light modulator, an inclined projection optical system including a free-form surface lens and a free-form surface mirror, various circuit components including a power supply circuit and a control circuit, a cooling fan, and the like.
- the light modulation unit is a light modulation unit that modulates light from a light source into video light based on a video signal from the outside, and is a video display element such as a DLP (Digital Light Processing) or a liquid crystal panel.
- the tilt projection optical system is capable of projecting the image light from an extremely short distance (large tilt angle) with respect to the wall surface while reducing trapezoidal distortion and the like, so that an excellent projection image can be obtained. Including free-form surface lenses and free-form surface mirrors.
- the various circuit components include a power supply circuit and a control circuit that supply necessary power and control signals to the components.
- the cooling fan guides the heat generated by the components to the outside of the apparatus.
- FIG. 2 is a lens arrangement diagram for explaining the operation principle of the projection lens in the tilted projection optical system.
- the inclined projection optical system of FIG. 2 is composed of a total of 12 lenses indicated by L1 to L12 and a mirror indicated by M13.
- the reflecting surface of the mirror M13 and the lens surfaces of the lenses L11 and L12 each form a free-form surface.
- the lenses L11 and L12 are so-called free-form surface lenses. For this reason, even a tilted projection optical system that projects an image at an extremely large tilt angle can obtain a projected image with reduced trapezoidal distortion. That is, according to this, the degree of design freedom is as large as about 5 times that of the aspherical surface, and good aberration correction is possible.
- the light source is a semiconductor light source in this example.
- the light from the light source is totally reflected by the prism surface, enters the image display element indicated by P1, is converted into an image light beam by the image display element P1, passes through the prism surface, and enters the projection lens.
- the video display element P1 is a reflective video display element.
- the image light beam from the image display element P1 passes through different positions of each lens in the projection lens with respect to the image formation position of the projection surface.
- the free-form surface mirror M13 and the free-form surface lenses L11 and L12 are located above the optical axis shared by most other lenses, and as is apparent from FIG. L11 and L12 have an average curvature radius in a horizontal section on the image projection surface of the lens surface facing the mirror M13 at the upper end, and a light beam that forms an image at the central portion of the image projection surface of the same lens surface passes. It has a shape that is larger than the average radius of curvature of the area to be operated.
- the mirror M13 has a reflection surface shape perpendicular to the image projection plane including its optical axis, and the center of the image projection plane is equal to the average radius of curvature of the region through which the light beam formed on the upper end of the image projection plane passes. It is formed so that the average radius of curvature of the region through which the light beam that forms an image passes is small. Therefore, unnecessary lens effective area can be eliminated and miniaturization can be achieved. Therefore, the cost of the entire apparatus can be reduced.
- the lens indicated by L10 in FIG. 2 corrects coma and spherical aberration by using an aspheric lens surface. That is, the lens L10 is an aspheric lens. Further, since the lens L10 is disposed at a position where the light beam passes in an uneven manner, the lens surface is aspherical so that the higher order generated when the light beam is obliquely incident on the lens. The coma aberration is corrected.
- the light flux ⁇ 2 that forms an image at the upper end portion of the projection surface and the light beam ⁇ 1 that forms an image at the substantially central portion of the projection surface are determined by which of the individual lenses indicated by L1 to L12 constituting the projection lens. It is shown in FIG.
- the upper limit light of the light beam ⁇ 2 that forms an image at the upper end portion of the projection surface and the lower limit light of the light beam ⁇ 1 that forms an image at a substantially central portion of the projection surface are L10 that is an aspheric lens and L11 and L12 that are free-form surface lenses. Since they do not overlap, aberration correction can be performed independently, and the correction capability is greatly improved.
- Lenses L1 to L10 that contribute to aberration correction in a region relatively close to the optical axis are incorporated in the lens barrel B1
- L11 and L12 that contribute to aberration correction in a region away from the optical axis are In order to adjust the focus, the lens is incorporated in a lens barrel B2 that is separate from the lens barrel B1.
- interval of the lens L10, the lens L11, the lens L12, and the free-form surface mirror M13 it is set as the structure which can also adjust the space
- the free-form surface mirror M13 is attached to the mirror base MB1, and can be opened and closed by an electric motor (not shown), for example. Furthermore, since all of these are fixed to the projection lens base with high accuracy, a predetermined focusing performance can be obtained.
- FIG. 3 shows the outer shape of the above-described free-form surface lens L11.
- 3A is a perspective view seen from the front side of the free-form lens L11
- FIG. 3B is a perspective view seen from the back side
- FIG. 3C is a front view
- FIG. 3D is a side view
- FIG. The rear views are shown respectively.
- This free-form surface lens L11 is a plastic lens, and as is apparent from FIG. 3, a so-called lens edge portion (also referred to as an edge portion) L11-b is provided together with the lens effective area L11-a.
- the lens edge portion L11-b is provided on the outer periphery of the lens effective area L11-a for the purpose of positioning and holding when the lens is incorporated into the lens barrel B2.
- L11-b particularly indicates the edge surface.
- contour lines for indicating the surface shape are indicated by broken lines in the lens effective area L11-a of the free-form surface lens L11. Further, L11-c in FIG. 3 indicates a gate portion when resin is injected.
- FIG. 4 shows the outer shape of the above-described free-form surface lens L12 as in FIG. 4A is a perspective view seen from the front side of the free-form lens L12
- FIG. 4B is a perspective view seen from the back side
- FIG. 4C is a front view
- FIG. 4D is a side view
- FIG. Each show a rear view.
- the free-form surface lens L12 is also a plastic lens like the above L13, and as is apparent from FIG. 4, a so-called lens edge portion L12-b is provided together with the lens effective region L12-a.
- the lens edge portion L12-b is provided on the outer periphery of the lens effective area L12-a for the purpose of positioning and holding when the lens is incorporated into the lens barrel B2.
- contour lines for indicating the surface shape are indicated by broken lines in the lens effective area L12-a of the free-form surface lens L12. Further, L12-c in FIG. 4 indicates a gate portion when the resin is injected.
- FIG. 5 shows the outer shape of the above-described free-form curved mirror M13.
- 5A shows a front view of the free-form surface mirror M13
- FIG. 5B shows a side view
- FIG. 5C shows a rear view.
- This free-form surface mirror M13 is made of plastic as described above.
- the free-form surface mirror M13 has a free-form surface that is a lens region obtained by extending the free-form surface as it is on the outer periphery of the effective lens region M13-a. Has an area.
- the reflection mirror surface is convex with respect to the image projection surface, and is preferably designed to have a uniform mirror thickness in order to improve the moldability of the mirror and obtain mass production stability.
- the back surface shape may be a curved surface or a substantially flat surface in which the average curvature is matched to the reflecting surface.
- the surface roughness of the back surface is preferably smaller than 20 times the surface roughness of the lens effective area.
- the back surface (the mold surface is a convex surface) closely adheres during mirror molding, and the balance between the reflective surface and the back surface of the mold during release (in other words, adhesion of the molded product to the mold surface) is improved.
- the accuracy of the free-form surface of the mirror surface is improved.
- the surface roughness of the back surface is made smaller than 10 times the surface roughness of the lens effective area, a further improvement effect can be obtained.
- a free-form surface mirror with excellent shape accuracy is provided.
- fixing portions 141 and 144 are provided in the portion other than the free curved surface region of the free curved mirror for the purpose of positioning and holding when the mirror base MB1 is attached.
- the fixing part 141 is indicated by 141L and 141R.
- the above-described free-form surface lenses L11 and L12 and further the free-form surface mirror M13 are created as follows as a design method including the molding method.
- the design method produces a mold for injection molding, considering the shrinkage and warping of the plastic, etc., and the shape of the molded lens surface is multiple times so that the minimum error with respect to the design shape. Repeat the correction of the mold shape. Using the mold having the shape obtained by such correction, the lens and the mirror are created by injection molding.
- a transparent resin in the form of pellets or powder is melted in a screw and pressurized by rotation of the screw, and the gate part (L11-c, L12-c) through the mold spool and runner. , M13-c), heat-dissolved resin is extruded into the space formed by the movable and fixed pieces, thereby filling the mold.
- the free-form surface lens is effective at the incident surface on which an effective light beam, which is a light beam contributing to image formation, is incident and on the exit surface from which the light beam is emitted after being subjected to the lens action.
- Aberration correction is performed as a degree of design freedom for the lens shape of the effective region through which the light beam passes.
- a lens edge surface that is, a surface for fixing the lens to the lens barrel is set together with the lens effective area described above, and these are joined together. Determine the final shape of the lens.
- the lens surface often has an asymmetric shape with respect to the optical axis, and thus it is difficult to provide the edge surface over the entire lens surface.
- FIG. 8 shows the shape of a conventional first free-form surface lens for comparison with the present embodiment.
- FIG. 9 shows the shape of a conventional second free-form surface lens for comparison with the present embodiment.
- a free-form surface lens L15 shown in FIGS. 8A to 8D is a lens corresponding to the free-form surface lens L12 shown in FIG. 8A is a perspective view of L15
- FIG. 8B is a plan view
- FIG. 8C is a side view
- FIG. 8D is a side sectional view
- a free-form surface lens L16 shown in FIGS. 9A to 9D is a lens corresponding to the free-form surface lens L11 shown in FIG. 9A is a perspective view of L16
- FIG. 9B is a plan view
- FIG. 9C is a side view
- FIG. 9D is a side sectional view.
- a lens edge portion L15-b for positioning and holding during assembling is provided on the outer peripheral portion of the lens effective region L15-a.
- a lens edge portion 16-b is provided on the outer peripheral portion of the lens effective region L16-a for positioning and holding during assembly.
- the free-form surface lens has a complicated lens shape, and a part thereof, that is, lens effective areas L15-a and L16 in FIGS. 8A to 8D and FIGS. 9A to 9D. At the lower end portion of -a, a portion where the edge portions L15-b and 16-b are not provided is generated.
- the design method of the present embodiment is such that the lens surface has a concave shape, and if the edge surface cannot be provided over the entire circumference of the lens surface, the surface of the lens effective area is inclined.
- the lens effective area and the edge surface are connected by a plane or a curved surface (straight line or curve) to such an extent that the direction (ie, the sign of the differential value) does not change, and the edge surface L11-b is continuously formed on the outer periphery of the lens effective area.
- the end surface is at least 5 degrees and at most 20 degrees or less. It has been found that providing a tapered surface is effective. If the taper angle exceeds 20 degrees, it is difficult to continuously form the lens effective area and the edge portion.
- the free-form surface lens L11 As shown in FIG. 3 and FIG. 6, at the outer periphery of the lens effective area L11-a (indicated by the mesh area in FIGS. 3C and 3E).
- the curved surface L11-w and the flat surface L11-p are formed, thereby connecting the edge surface L11-b.
- 109 in FIG. 3 indicates a concave portion formed in the edge portion L11-b for positioning and holding when the lens is assembled, and 112 and 113 indicate protrusions for positioning and holding similarly. Yes.
- the edge surfaces on both sides of the lens effective area L11-a are formed by forming the curved surface L11-w and the plane L11-p. L11-b is connected.
- the curved surface L11-w is set so that the direction of inclination of the lens effective area 11-a in the vicinity thereof (that is, the sign of the differential value) does not change.
- the curved surface L11-w is set as a curve protruding downward.
- the flat surface L11-p at the end of the formed curved surface L11-w is the aforementioned tapered surface.
- the end of the lens effective area L11-a is continuously formed between the edge surfaces L11-b on both sides thereof. .
- the connection between the edge surfaces L11-b is enhanced, and the mold release resistance generated along with the mold release becomes uniform within the lens surface, so that the completed free-form surface lens can be obtained without any lens deformation. It is possible to stably take out from the mold without deformation.
- FIG. 6 is an explanatory diagram for explaining a design method of the free-form surface lens L11, and shows an enlarged view of the lens effective area L11-a and the edge surface L11-b of the free-form surface lens L11 of FIG.
- a part of the lens L12-b (the lower part in the drawing) is not provided with the lens effective region.
- a curved surface L12-w and a plane L12-p are formed on the outer periphery of the lens effective area L12-a.
- the edge portions L12-b on both sides of the lens effective area L12-a are connected by forming the curved surface L12-w and the plane L12-p described above.
- the curved surface L12-w is also set so that the direction of inclination of the lens effective region 12-a in the vicinity thereof (that is, the sign of the differential value) does not change.
- the flat surface L12-p at the end of the formed curved surface L12-w is the aforementioned tapered surface.
- a dam-like convex portion L12-d is further formed between the curved edge portions L12-b, and the side surfaces thereof are tapered surfaces as described above.
- 129L and 129R in FIG. 4 respectively indicate concave portions formed in the edge portion L12-b for positioning and holding when the lens is incorporated, and 122 and 123 are the positioning and holding portions, respectively. The protrusion part for this is shown.
- the connection between the edge surfaces L12-b is further enhanced, including the function of the dam-shaped convex portion L12-d, and the mold release
- the mold release resistance generated along with the lens becomes uniform in the lens surface, and without accompanying deformation of the lens, more specifically, the U-shaped lens L12 having a cross section does not spread on both sides.
- the completed free-form surface lens can be safely removed from the mold.
- FIG. 7 is an explanatory diagram for explaining a design method of the free-form surface lens L12, and shows an enlarged view of the lens effective area L12-a and the edge surface L12-b of the free-form surface lens L12 in FIG.
- the free-form surface lenses L11 and L12 described above are caused by the shrinkage of the lens caused by the temperature difference between the resin forming the lens and the mold, particularly when the shape of the lens surface is molded.
- the lens effective areas L11-a and L12-a, the edge surfaces L11-b and L12-b, and the taper surface are adhered to the mold. This is also one of the causes of deformation of the lens when the completed free-form surface lens is taken out of the mold.
- the lens surface has a mirror-finished surface, so the adverse effect of such a phenomenon is great.
- the free curved lenses L11 and L12 are roughened to reduce the sticking to the above-described mold. This proved to be effective as a countermeasure.
- surface roughness it is good to set it as about 20 nm or more and 100 nm or less, for example.
- the phenomenon as described above was not limited to the free-form surface lenses L11 and L12, but was also observed in the free-form surface mirror M13, which is a plastic mirror molded from a synthetic resin.
- the free-form surface mirror M13 which is a plastic mirror. More specifically, the free-form surface mirror and the design method thereof according to the present embodiment are the lens effective region M13 ⁇ that is the reflection surface of the free-form surface mirror M13 shown in FIGS.
- the outer peripheral part of a is provided with a free curved surface area which is a lens area obtained by extending the free curved surface shape as it is.
- the reflection mirror surface is convex with respect to the image projection surface, and is designed to have a uniform mirror thickness in order to improve the moldability of the mirror and obtain mass production stability.
- the mirror having a uniform thickness is obtained by making the shape of the back surface of the mirror surface, which is a reflection surface, substantially the same as that of the reflection surface.
- a reflection mirror protruding pin is formed in the range of the back surface of the reflection mirror from which the free curved surface effective surface is removed, and the forming accuracy within the free curved surface effective surface of the reflection mirror generated at the time of mold release is stabilized.
- the surface roughness of the back surface is roughened by about 20 times the surface roughness of the lens effective area, and the surface roughness is gradually reduced, and the back surface (the mold surface is a convex surface) is gold during mirror molding.
- the balance between sticking of the reflective surface and the back surface during release was performed.
- the surface roughness of the back surface is made smaller than 10 times the surface roughness of the lens effective area, a further improvement effect can be obtained, and the free curved surface effective area A free-form surface mirror with excellent shape accuracy was provided.
- 141L and 141R in FIG. 5 indicate protrusions for positioning and holding when the free curved surface mirror M13 formed at both end edges outside the free curved surface effective area is attached to the mirror base MB1.
- 142L, 142R are concave portions provided in the projecting portion.
- Reference numeral 144 denotes a protrusion formed at the lower edge of the free curved surface effective area.
- the free-form surface lenses L11 and L12 including the free-form surface mirror M13 which is the plastic mirror described above are used as free-form surface lenses and free-form surface mirrors constituting the inclined projection optical system of the projection display apparatus.
- these lenses and mirrors can be mass-produced at low cost from a resin using a mold.
- DESCRIPTION OF SYMBOLS 100 Projection type image display apparatus, L11, L12 ... Free-form surface lens, L11-a, L12-a ... Lens effective area, L11-b, L12-b ... Lens edge part, L11-c, L12-c ... Gate part, L11-p, L12-p ... plane, L11-w, L12-w ... curved surface, L12-d ... dam-shaped convex part, M13 ... free-form surface mirror, M13-a ... mirror effective area, M13-b ... edge part .
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Abstract
Description
Claims (2)
- 光源からの光を光変調部で変調した映像光を拡大して投写する投写型映像表示装置であって、
前記変調した映像光を拡大して投写する傾斜投写光学系を備えており、
前記傾斜投写光学系は、複数枚のレンズ素子と、映像投写面に対して凸形状をなす反射ミラーを含んでおり、
前記反射ミラーに最も近い位置に配置された一枚又は複数枚のレンズ素子の外形中心は、他のレンズ素子が共有する光軸より上部に位置しており、
前記反射ミラーは、当該反射ミラーの光軸を含む前記映像投影面に垂直方向の反射面形状が、前記映像投写面の上端部に結像する光束が通過する領域の平均曲率半径に対し、前記映像投写面の中央部で結像する光束が通過する領域の平均曲率半径が小さくなるように形成されており、
前記反射ミラーに最も近い位置に配置されたレンズ素子は、その上端部の前記反射ミラーに面したレンズ面における前記映像投写面に水平方向の断面の平均曲率半径が、同一レンズ面の前記映像投写面の中央部で結像する光束が通過する領域の平均曲率半径よりも大きい形状をなしている、投写型映像表示装置。 - 前記請求項1に記載した投写型映像表示装置において、少なくとも前記一枚又は複数枚のレンズ素子及び前記反射ミラーは、プラスチック材から形成されている、投写型映像表示装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2015/056962 WO2016143061A1 (ja) | 2015-03-10 | 2015-03-10 | 投写型映像表示装置 |
CN201910948093.3A CN110658670B (zh) | 2015-03-10 | 2015-03-10 | 投影型影像显示装置 |
CN201580077271.XA CN107407864B (zh) | 2015-03-10 | 2015-03-10 | 投影型影像显示装置 |
US15/555,019 US10678017B2 (en) | 2015-03-10 | 2015-03-10 | Projection image display device |
JP2017504477A JP6527578B2 (ja) | 2015-03-10 | 2015-03-10 | 投写型映像表示装置 |
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CN107407864A (zh) | 2017-11-28 |
JP6527578B2 (ja) | 2019-06-05 |
CN110658670A (zh) | 2020-01-07 |
JPWO2016143061A1 (ja) | 2017-11-02 |
CN110658670B (zh) | 2021-07-27 |
US20180052296A1 (en) | 2018-02-22 |
CN107407864B (zh) | 2020-05-12 |
US10678017B2 (en) | 2020-06-09 |
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