JP2009139612A - Screen and projection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen which reduces influence by external light, so that contrast of a projection image in a bright room or the like is improved, and which effectively utilizes projection light on a periphery side of the screen, especially, on the periphery side in a right-and-left direction thereof, and to provide a projection system. <P>SOLUTION: Transmissive glass beads TB are reduced in an area CP near the center of each cylindrical lens CL of the screen 10, and much more transmissive glass beads TB are made to exist in an area FP on the periphery side, whereby reflection with stronger regressivity is generated on the periphery side in the right-and-left direction on the screen 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a screen that reflects projection light from a projection device such as a front projector and displays a projected image, and a projection system using the screen.

As a screen using a lenticular lens, there is known a screen having a diffusivity to widen a viewing angle. For example, a screen using a light diffusing material in order to have a diffusivity (see Patent Document 1), or a diffusing lens. What provides an unevenness | corrugation is known (refer patent document 2). In addition, as a transmissive screen, in which beads are arranged on the surface layer for light diffusion (see Patent Documents 3 and 4), the weight concentration of the light diffusing fine particles is changed between the light incident side and the light emission side. (See Patent Document 5). In addition to this, there is known one that increases light diffusibility at the upper and lower end portions as compared with the center portion of the screen (see Patent Document 6).
JP-A-4-322240 JP-A-4-297640 JP-A-4-282625 JP-A-1-161328 JP-A-5-61120 JP-A-8-334837

  However, in the use of a reflective screen that reflects a projection light from a projection device such as a front projector and displays a projection image, the angle of the incident light from the projection device increases toward the peripheral side away from the center position of the screen. I will. For this reason, the light incident on the peripheral side of the screen is reflected and diffused further outward. In this case, there is a problem that light reflected and diffused on the peripheral side particularly in the left-right direction of the screen is reflected and diffused in a direction where there is no observer on the outer screen and is not used effectively.

  As another problem, in the use of a reflective screen, a part of the external light that is unnecessary light may be reflected in the direction of the observer of the screen, and the reflected external light is projected image. This may cause a decrease in contrast.

  Therefore, the present invention can reduce the influence of external light, improve the contrast of the projected image in a bright room, etc., and further effectively use the projection light on the peripheral side of the screen, particularly in the lateral direction. An object is to provide a screen and a projection system that can.

  In order to solve the above-described problems, a screen according to the present invention has (a1) a surface formed by arranging a plurality of cylindrical lenses in a direction perpendicular to the longitudinal direction of each cylindrical lens, and (a2) vertical A groove having a bottom surface inclined with respect to a specific direction along the longitudinal direction on the back side of the plurality of cylindrical lenses; (b) disposed on the bottom surface corresponding to at least the end side of the lenticular lens; (B2) having a convex part and / or a concave part showing recursive properties for reflecting the light having passed through the lenticular lens again in the incident direction, and (b3) as the distance from the center of the lenticular lens to the end side is increased. And (b) an undulating portion that increases the regressability by changing the state of the convex portion and / or the concave portion. Here, “regression” refers to a reflection phenomenon in which incident light returns to the incident direction again. Unlike normal reflection, where the incident angle and the reflection angle are equal, the received light remains as it is. It means retroreflectivity that rebounds to the generation side. Further, “changing the state of the convex part and / or the concave part” means, for example, changing the arrangement and shape of the convex part and / or the concave part, thereby increasing the strength of “returnability” of the undulating part. Change.

  The above screen has a bottom surface that is inclined with respect to the direction in which the grooves provided on the back side of the plurality of cylindrical lenses are arranged, and has a undulation portion on the bottom surface, that is, adjustment of the reflection angle by the bottom surface and the undulation portion. Due to the regressive action, it is possible to increase the tendency of the projection light incident on the screen to be emitted in a direction substantially normal to the screen plane. In particular, the undulating portion can be structured to generate a stronger recursive property as the distance from the center of the lenticular lens, that is, the center of the screen, to the peripheral side in the longitudinal direction, so that the periphery of the cylindrical lens in the longitudinal direction, that is, the horizontal direction of the screen The tendency to return the light projected to the front side to the front side increases, and the projected light can be used effectively. At this time, by adjusting the shape of the groove, the influence of external light can be reduced, and the contrast of the projected image in a bright room or the like can be improved.

  Further, as a specific aspect of the present invention, the undulating portion has a linear shape extending in a direction in which the convex portion and / or the concave portion intersect the longitudinal direction, and a plurality of linear convex portions and / or concave portions are provided in the longitudinal direction. It is arranged. In this case, the convex part and / or the concave part has a linear shape extending in the direction intersecting the longitudinal direction, so that the light incident on the screen according to the position and inclination in the longitudinal direction on the bottom surface of the convex part and the concave part. The desired regression can be produced. Of the convex portions and / or concave portions of the undulating portion, at least the central portion of the lenticular lens has a gradient equal to, for example, the vertical direction relative to the longitudinal direction on the bottom surface, that is, the gradient due to the inclination of the bottom surface. It shall extend in the direction. In this case, the convex portion and / or the concave portion on the center side return incident light toward the front.

  Moreover, as a specific aspect of the present invention, the distance between the linear convex portions and / or the concave portions is smaller as it is provided in the peripheral portion of the screen. Thereby, since the number of convex parts and / or concave parts per unit area increases toward the side away from the center of the lenticular lens in the longitudinal direction, that is, the peripheral part of the screen, it is possible to strengthen the regression.

  Moreover, as a specific aspect of the present invention, (a) a linear convex portion and / or a concave portion is such that an angle formed by a direction along the straight line and a longitudinal direction is provided in the peripheral portion of the screen. One end of the small and (b) linear convex portion and / or concave portion disposed at a position close to the lenticular lens is located closer to the center of the screen than the other end. In this case, the lens existing on the center side of the lenticular lens extends on the bottom surface in a large angular direction (for example, perpendicular) to the longitudinal direction, while the other protrusions and / or recesses have one end extending in the longitudinal direction. As it goes away from the periphery along the direction, it extends in a small angular direction with respect to the longitudinal direction (specifically, the direction tilted toward the center of the lenticular lens), and the direction in which the recesses and protrusions extend is incident It can be made substantially perpendicular to the central light flux of the light to be transmitted. Thereby, a linear convex part and / or a recessed part can be arrange | positioned so that the recursive reflection with respect to the incident light may become the optimal.

  Further, as a specific aspect of the present invention, the height of the linear convex portion and / or the depth of the concave portion is larger as the peripheral portion of the screen is provided. Thereby, the regressive action per one convex part and / or concave part becomes stronger toward the side away from the center of the lenticular lens in the longitudinal direction, that is, the peripheral side of the screen.

  Further, as a specific aspect of the present invention, the undulating portion has a lenticular shape or a prism array shape on the bottom surface. In this case, by appropriately adjusting the lenticular shape or the prism array shape, it is possible to strengthen the regressability per unit area at a necessary portion of the screen.

  As a specific aspect of the present invention, the screen further includes a light absorbing material on at least the back side of the undulating portion and the surrounding bottom surface on the back side of the lenticular lens. In this case, the light absorbing material can absorb unnecessary light such as external light to form a high-contrast image.

  As a specific aspect of the present invention, the lenticular lens has an antireflection coating on the surface. Thereby, reflection on the screen surface can be prevented.

  Further, as a specific aspect of the present invention, the lenticular lens can be rolled up and has a structure in which the longitudinal directions of a plurality of cylindrical lenses are arranged along the direction of the axis of rolling. Thereby, when the screen is rolled and stored, the boundary portion between the plurality of cylindrical lenses is mainly bent, so that the deformation amount of the main body portion of the cylindrical lens can be reduced.

  As a specific aspect of the present invention, a projection system according to the present invention includes (a) any of the screens described above, and (b) an image projection device that projects a projected image on the screen. In this case, by using the screen, the projection system can effectively use the projection light, reduce the influence of external light, and improve the contrast of the projection image in a bright room or the like.

[First Embodiment]
Hereinafter, a screen according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view schematically showing a screen according to the present embodiment. FIGS. 2 (a) and 2 (b) are diagrams schematically showing the state of the front side and the back side of the screen, respectively. FIG. 3 is a diagram illustrating the entire screen and the usage state. The screen 10 of the present embodiment is a reflective screen, and the lenticular lens 1, the undulating portion 2 locally formed on the back side of the lenticular lens 1, and the back surface of the lenticular lens 1 on which the undulating portion 2 is formed. A light absorbing sheet 3 which is a light absorbing material covering the whole. The undulating portion 2 is formed by a large number of convex portions 2 a, and the scattering material 2 b is applied to the entire back of the bottom surface BS including the undulating portion 2.

As shown in FIG. 1 and FIG. 2A, the lenticular lens 1 as a whole is formed by arranging a large number of cylindrical lenses CL extending in the x direction (longitudinal direction) and arranging them in the y direction perpendicular to the longitudinal direction. A surface 10a extending in parallel to the xy plane is configured (see FIG. 3). That is, these cylindrical lenses CL are two-dimensionally arranged to form the surface 10 a of the screen 10. Each cylindrical lens CL causes the projection light PL to be incident and condensed, and emits the projection light PL scattered and reflected inside the screen 10 at a predetermined divergence angle. Further, as shown in FIGS. 1 and 2B, a groove GT having a wedge-shaped cross section is formed on the back side of the lenticular lens 1 along the longitudinal direction of each cylindrical lens CL, that is, the x direction. That is, as shown in FIG. 1, the shape of the groove GT in the yz section is defined by the side surface SS substantially perpendicular to the y direction in which the cylindrical lenses CL are arranged and the inclined bottom surface BS. In the illustrated example, the bottom surface BS is uniformly determined with respect to the z direction in order to increase the tendency to reflect the projection light PL that is collected by each cylindrical lens CL and is inclined obliquely upward and incident in the front direction, that is, the + z direction. It is inclined at the inclination angle alpha _1.

As shown in FIGS. 1 and 2B, the undulating portion 2 has a lenticular shape as a whole by arranging a large number of linear convex portions 2a along the longitudinal direction of the bottom surface BS on the surface of the bottom surface BS. It has become. More specifically, each convex portion 2a forming the undulating portion 2 has a columnar shape with a semicircular cross section, is made of the same material as the lenticular lens 1, and is integrally molded with the lenticular lens 1. Is. Each convex portion 2a, extend in the vertical direction in a straight line at the same angle of inclination alpha ₁ and the bottom surface BS along the inclination of the bottom surface BS. That is, each convex portion 2a extends vertically on the bottom surface BS so as to intersect the longitudinal direction of the bottom surface BS. Each convex portion 2a shows a recursive reflection characteristic in which the direction of light incident on the bottom surface BS is changed and reflected in a direction reverse to the incident direction. Further, the scattering material 2b that coats the bottom surface BS and the undulating portion 2 is formed by mixing a material containing a scattering component as a main component with a material containing a reflective component, and reflects light incident from the bottom surface BS in the + z direction. At this time, the light is scattered with an appropriate dispersion characteristic having no inclination in the vertical direction, that is, the y direction. Thereby, the effect which guides the projection light PL incident on the screen 10 from the lower side close to the front with a certain spread can be produced. As the scattering component, for example, barium sulfate or the like is used. As the reflective component, for example, pearl white ink is used. As described above, on the bottom surface BS, the emission light in a state of being appropriately scattered by the scattering property by the scattering material 2b is formed, and the light emission direction with respect to the incident light is adjusted by the recurrence of the convex portion 2a of the undulating portion 2. To do. Furthermore, the undulating portion 2 reduces the pitch of the convex portions 2a as the distance from the center in the longitudinal direction, that is, in the x direction, with respect to the center position in the longitudinal direction of each cylindrical lens CL, so that the amount of the regression component is reduced. It has been adjusted to increase. That is, the interval between the plurality of linear protrusions is smaller as it is provided in the periphery of the screen 10. Here, as shown in FIG. 2B, in the screen 10, the region CP near the center of each cylindrical lens CL is a region with few convex portions 2 a, and the region on the peripheral side in the longitudinal direction of the cylindrical lens CL. The FP is a region with many convex portions 2a. Thereby, the effect which returns the projection light PL which injected into the left and right both sides of the screen 10 to the front can be produced.

  The light-absorbing sheet 3 is an elastic sheet material made of a light-absorbing material. The light-absorbing sheet 3 is attached to the rear side of the undulating portion 2 of the lenticular lens 1 and covers the entire surface on the back side of the lenticular lens 1. Yes. The light absorbing sheet 3 absorbs unnecessary light such as outside light.

  As shown in FIG. 3, image projection is performed by projecting projection light PL onto a screen 10 from a projection light source point S of a projection lens PO included in a projection device or the like. The projection light source point S is installed at a lower position close to the screen 10. Here, as shown in the figure, the light beam axis AX of the projection light PL incident on the center position O of the screen 10 is the projection angle α, and the distance from the projection light source point S to the screen 10 is the projection distance d. In this state, the light is projected from below to above. In the case of the so-called front projection type as shown in FIG. 3, the screen 10 is optically designed with the center position O as a reference for the center position. Here, the light beam axis AX of the projection light PL intersects the axis HX extending through the center position O in the horizontal direction of the screen 10, that is, in the x direction, perpendicularly. In the case of FIG. 3, in the left-right direction, that is, the x direction, the vertical axis LX that passes through the center position O on the screen 10 and perpendicularly intersects the axis HX and extends in the y direction is separated from the vertical axis LX toward the peripheral side. As it goes, the angle of the projection light PL becomes easier. In particular, when performing proximity projection, that is, when the value of the projection distance d is small, the incident angle β of the projection light PL incident on the peripheral side becomes large. For this reason, the projection light PL incident on the peripheral side in the left-right direction of the screen is reflected more outward on the screen 10 and is out of the field of view of the observer in front of the screen 10, that is, on the + z direction side in front of the screen 10. However, in the present embodiment, an image that is relatively easy to see can be displayed by suppressing such a tendency.

Hereinafter, returning to FIG. 1, the structure of the screen 10 will be described in detail by explaining the formation of a projected image on the screen 10. As described above, the projection light PL emitted from a projection device such as an image projection device is incident from the lens surfaces 11a of the plurality of cylindrical lenses CL formed on the screen 10 around the standard projection angle α. The incident projection light PL is condensed on the bottom surface BS on the back surface side by each cylindrical lens CL. Here, the inclination angle alpha ₁ of the bottom surface BS is designed to be substantially equal to half the standard incident angle of the bottom surface BS of the projection light PL that has been redirected by the focusing of the cylindrical lens CL. In this case, the fact that the projection light PL, for example the incident angle on the bottom surface BS is in a state equal to twice the inclination angle alpha ₁ is specularly reflected in the normal + z-direction. Therefore, by standard incident angle of the bottom surface BS of the projection light PL is set to be approximately 2 times the tilt angle alpha _1, tend to reflect the projection light PL incident on the bottom surface BS in the front direction, that is + z direction Will increase. In addition, the projection light PL is appropriately scattered by the scattering component of the scattering material 2b applied behind the bottom surface BS and the undulating portion 2 formed on the bottom surface BS and emitted from the bottom surface BS. Further, the light incident on the convex portion 2a of the undulating portion 2 is reflected in a direction reverse to the incident direction due to the regressive reflection characteristic. The projection light PL emitted from the bottom surface BS in this way is emitted from the screen 10 after being expanded to an appropriate divergence angle by a cylindrical lens CL or the like. As described above, the projection image by the projection light PL incident on the screen 10 has an appropriate viewing angle characteristic due to the effect of scattering or the like while maintaining the tendency to reflect in the front direction, that is, the + z direction, and the periphery of the cylindrical lens CL. On the side, the reflexive reflection characteristic is adjusted so that the reflection direction is biased toward the front side of the screen 10.

  On the other hand, illumination light or the like that generates external light OL that is unnecessary for image projection is often installed, for example, on the ceiling side of a room to illuminate the room. As described above, most of the external light OL projected from above is incident on a portion of the screen 10 where the side surface SS of the groove GT or the light absorbing sheet 3 is exposed. The external light OL incident on the side surface SS of the groove GT is reflected from the angle of the side surface SS without going to the front of the screen 10 on which the observer is present, and the external light OL incident on the light absorbing sheet 3 is also reflected on the screen 10. Absorbed without heading forward.

  Note that an AR coating CT which is an antireflection coating is applied to the surfaces of the plurality of cylindrical lenses CL constituting the surface of the lenticular lens 1. Thereby, reflection of light is prevented.

  The screen 10 can be rolled up in the direction of arrow AW shown in FIGS. 2 (a) and 2 (b). In this case, the boundary portion BP connecting the cylindrical lenses CL of the lenticular lens 1 is mainly bent, so that the cylindrical lens CL itself can be rolled and stored without being deformed so much.

  FIG. 4A is a diagram illustrating a part of the screen 10 and is an enlarged view of a part of the cylindrical lens CL extracted from the lenticular lens 1. 4A corresponds to the center side of the screen 10 in FIG. 2B, that is, the region CP side in FIG. 2B, and the left side in FIG. 4B corresponds to the peripheral side, that is, the region FP side in FIG. It corresponds to. As can be seen from FIG. 4A, the pitch between the convex portions 2a becomes finer toward the peripheral side, that is, the region FP side in FIG. 2B, and the convex portions 2a are in a dense state. That is, the undulating portion 2 is in a state in which there are more convex portions 2a per unit area as it moves away from the center position of the lenticular lens 1 along the longitudinal direction toward the peripheral side. Specifically, the density of the convex portions 2a monotonously increases in proportion to the distance away from the vertical axis LX in FIGS. 2B and 3 in the ± x direction. Due to the recurrence of each convex portion 2a, stronger recursive reflection occurs on the peripheral side of the screen 10 in the left-right direction. FIG. 4B shows the cross-sectional shape of the convex portion 2 a that forms the undulating portion 2. In this case, as shown in the drawing, the cross-sectional shape of each convex portion 2a is a semicircular shape protruding from the bottom surface BS.

  FIG. 4C is a diagram showing a modification of the present embodiment. In the present modified example, the inclination direction of each convex portion 2a on the bottom surface BS is further different. Specifically, among the plurality of protrusions 2a, the one on the center side of the screen 10 is arranged perpendicular to the longitudinal direction of the bottom surface BS, whereas the one that goes to the peripheral side of the screen 10 They are arranged with a large inward or central tilt. That is, of the both ends of each linear convex portion 2 a, the upper end EP of the screen 10, that is, the end EP protruding to the lenticular lens CL side is inclined toward the center of the screen 10. In other words, the end EP on the side closer to the lenticular lens CL among the both ends of each linear convex portion 2 a is inclined toward the center of the screen 10. As described with reference to FIG. 3, the projection light PL is more likely to have an angle as it moves away from the vertical axis LX toward the peripheral side. That is, the incident angle β of the projection light PL incident on the peripheral side is increased. In this modification, the inclination direction on the bottom surface BS of each convex portion 2a is adjusted in accordance with the change in the incident angle β. Specifically, each projection 2a is tilted toward the center of the screen 10 in accordance with the incident angle β, so that the projection light PL incident on the center of each projection 2a and the linear projection 2a are substantially perpendicular. It is designed to intersect. Thereby, each convex part 2a has an exact regression according to an arrangement place. In the case of FIG. 4C as well, the cross-sectional shape of each convex portion 2a is a protruding semicircular shape.

  5 (a) and 5 (b) are diagrams showing other modified examples of the present embodiment. The projection 2a and the peripheral side in the vicinity of the center of the screen 10, that is, the region CP in FIG. 2 (b), respectively. It is a figure which shows typically the convex part 2a in the area | region FP of FIG.2 (b). As can be seen by comparing FIGS. 5A and 5B, the height of the convex portion 2a formed on the bottom surface BS is lower in the vicinity of the center of the screen 10 than on the peripheral side. Here, in particular, the height of the convex portion 2a is gradually increased from the vicinity of the center of the screen 10 toward the peripheral side. Thereby, the regressibility by the undulating portion 2 gradually becomes stronger from the central position toward the peripheral side. That is, on the screen 10, stronger recursive reflection occurs on the peripheral side in the left-right direction.

  FIG. 6A is a diagram showing still another modification of the present embodiment. In the above example, each of the undulating portions 2 has a configuration in which a large number of convex portions 2a protruding from the surface of the bottom surface BS are arranged. In this modified example, as shown in FIG. The undulating portion 2 is formed by providing a cylindrical recess 22a on the surface of the BS. That is, in this case, as shown in FIG. 6B, the cross-sectional shape of each recess 22a is a concave semicircular shape. Also in this case, similarly to the above-described case, the recess 22a has the reflexive reflection characteristic, so that the projection light PL incident on the screen 10 is appropriately reflexively reflected according to the position of the screen 10. Can do.

  FIGS. 7A and 7B are cross-sectional views showing examples of other undulating portions of the present embodiment. As described above, the shape of the undulating portion 2 is formed by the convex portion 2a or the concave portion 22a having a semicircular cross section as shown in FIGS. 4B and 6B, for example. Alternatively, for example, a convex portion 2a having a mountain-shaped cross section as shown in FIG. 7A or a concave portion 22a having a wedge-shaped cross section as shown in FIG. 7B may be used. Various shapes can be used as the undulating portion 2 on the bottom surface BS as long as they exhibit appropriate reflexive reflection characteristics. For example, the undulating portion 2 may have a prism array shape. It is also possible to form the undulating portion 2 by combining a convex shape and a concave shape.

As described above, in the screen 10 according to the present embodiment, first, by the bottom surface BS is inclined at an inclination angle alpha ₁ relative to the z-direction, thereby regularly reflected projection light PL from below toward the viewer In addition, the side light SS and the light absorbing sheet 3 do not reflect the external light OL from above to the viewer side, and can form an image with high contrast even when used in a bright room. Further, in the vertical direction of the screen 10, that is, in the y direction, the projection light PL is emitted to the observer side as being scattered with appropriate dispersion characteristics by the scattering effect of the scattering material 2 b applied to the bottom surface BS and the undulating portion 2. Can do. In addition to the above, in the left-right direction of the screen 10, that is, in the x direction, the convex portion 2a or the concave portion 22a in the undulating portion 2 is changed according to the distance away from the vertical axis VL in the ± x direction, thereby increasing the regression effect. Thus, the projection light PL is appropriately reflected by recursion. Accordingly, it is possible to avoid the state in which the projection light PL incident on the peripheral side of the screen 10 is directed in the direction where there is no observer on the outer screen, and to effectively use the projection light PL. In addition, when the scattering action is not required, the scattering material 2 b may not be applied on the undulating portion 2. Conversely, the entire groove GT may be filled with the scattering material 2b. In addition to the scattering material 2b, the groove GT may be filled with, for example, a light absorbing material.

[Second Embodiment]
FIG. 8 is a diagram illustrating a screen according to the second embodiment. FIG. 8 is a view for explaining the structure of the back side of the lenticular lens 101 of the screen 110 according to the present embodiment, and the undulating portion formed on the bottom surface BS of the groove GT formed corresponding to each cylindrical lens CL. The state of 102 is shown. Since the screen 110 of this modification is the same as the screen 10 of FIG. 1 and the like except for the configuration of the undulating portion 102, the illustration and detailed description of the configuration other than the configuration of the undulating portion 102 are omitted.

  In the screen 110 of the present embodiment, the undulating portion 102 is formed by a large number of array-shaped convex portions 102a that are two-dimensionally arranged on the bottom surface BS, that is, on a plane formed by the bottom surface BS. Each convex portion 102 a is a hemispherical lens-like member, made of the same material as the lenticular lens 101, and formed integrally with the lenticular lens 101. Each convex part 102a is arrange | positioned on one surface according to the position of the bottom face BS, and each shows a reflexive reflective characteristic. Specifically, as in the first embodiment, the number of convex portions 102a is adjusted so as to increase from the center of the cylindrical lens CL in the longitudinal direction, that is, along the x direction. Thereby, the effect which returns the projection light PL which injected into the left and right both sides of the screen 110 to the front can be produced.

  Also in the present embodiment, as in the first embodiment, convex portions and concave portions having various shapes and sizes shown in FIG. Further, the method of forming the undulating portion 102 is not limited to the method of integrally forming with the lenticular lens 101, and for example, the unevenness that becomes the undulating portion 102 may be formed by corroding the flat bottom surface BS with acid.

[Third Embodiment]
In the third embodiment, a projection system using the screen of the present invention will be described. FIG. 9 is a diagram showing an example of the projection system according to the present embodiment, and shows a projection system when a projector is used as the image projection apparatus for the screens 10 and 110 of the first and second embodiments. In FIG. 9, the projector 100 includes a projector body 50, a projection lens 20, and a reflection mirror RM. Each mechanism of projector 100 is housed in casing SC. Here, as the installation environment of the screens 10 and 110 and the projector 100, the illumination device 200 suspended from the ceiling is illuminated by external light OL from above, and the projector 100 is viewed from below the screen 10. Projection shall be performed.

  The image light formed by the control of the projector 50 is emitted from the projection lens 20 and further emitted as the projection light PL from the projector 100 in a state where a desired angle is given by reflection by the reflection mirror RM. . Accordingly, in this case, the projector 100 performs oblique projection in which the light beam axis of the projection light PL is inclined with respect to the normal line of the screens 10 and 110. The projection light PL projected on the screens 10 and 110 is reflected on the screens 10 and 110 as described above. At this time, as described above, since the screens 10 and 110 are configured corresponding to the projection angle of the projection light PL, the projected image reduces the influence of the external light OL and is projected in a bright room or the like. Not only can the contrast of the image be improved, but also the projection light PL can be used effectively on the peripheral side of the screens 10 and 110, particularly on the peripheral side in the left-right direction.

  In addition, this invention is not restricted to said embodiment, In the range which does not deviate from the summary, it can implement in a various aspect, For example, the following deformation | transformation is also possible.

  First, barium sulfate is used as the scattering material 2b. However, any material other than barium sulfate may be used as long as it exhibits an appropriate scattering action. Further, the pearl white ink is used as the reflective component to be mixed, but other than the pearl white ink may be used as long as it exhibits an appropriate reflection action.

  Moreover, in the said embodiment, although the undulation state of the undulation parts 2 and 102 shall be changed gradually or proportionally, it is not restricted to this, For example, the area | region of the bottom face BS is divided into some, and one area | region Shows uniform regression, but by changing the shape of the undulations 2 and 102 between different regions to give different regressions, the undulation state of the undulations 2 and 102 is changed step by step It may be a thing.

  Moreover, in the said embodiment, although the convex part 2a or recessed part 22a of the undulation parts 2 and 102 is all provided in the whole bottom face BS, the convex part 2a or the recessed part 22a is provided in the undulating parts 2 and 102 in the bottom face BS. It is provided only on the peripheral side, and it is not necessary to provide a recursive property in the vicinity of the center without providing irregularities.

  Further, instead of the light absorbing sheet 3, a light absorbing material may be formed by applying light absorbing ink or the like on the back side of the lenticular lens 1.

  In the above embodiment, the pitch of the grooves GT is not particularly defined, but the pitch of the grooves GT in the vertical direction of the screens 10 and 110 may be changed according to the incident angle of the projection light PL or the like. In this case, the thickness of the undulations 2 to be applied and the degree of change in density may be changed in each groove GT.

Moreover, in the said embodiment, although the inclination | tilt angle (alpha) ₁ of the bottom face BS is assumed to be uniform, the inclination angle may differ for every groove | channel GT of the screens 10 and 110 also about this. Furthermore, the degree of density of the convex portions 2a shown in FIG. 4A and the degree of inclination of the convex portions 2a shown in FIG. 4B may be different for each groove GT.

  In the embodiment described above, the direction of the light beam axis AX with respect to the projection light PL is from below in consideration of the use environment of a general projection apparatus or the like, and the shape of the bottom surface BS of the lenticular lens 1 is correspondingly changed. Although it is configured, when the projection light PL is other than below, the configuration of the lenticular lens 1 may be different depending on this. That is, for example, when the projection from the projector is performed from the side of the screen, the inclination of the bottom surface BS may be changed corresponding to the incident direction of the projection light PL. In addition, the present invention can be applied to front projection. In this case, the projection light PL tends to be reflected in the front direction, that is, the + z direction by arranging the bottom surface BS perpendicular to the z direction without providing an inclination. Can be increased.

It is the sectional side view which showed typically the screen which concerns on 1st Embodiment. (A), (b) is a figure explaining the surface and back surface of a screen. It is a figure explaining the projection to a screen from a projection apparatus etc. (A)-(c) is a figure for demonstrating the example of 1st Embodiment. (A), (b) is a figure for demonstrating the modification of 1st Embodiment. (A), (b) is a figure for demonstrating the other modification of 1st Embodiment. It is a figure for demonstrating the further another modification of 1st Embodiment. It is a figure for demonstrating the screen which concerns on 2nd Embodiment. It is a schematic diagram about the projection system which concerns on 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10,110 ... Screen, 1 ... Lenticular lens, 2 ... Relief part, 2a, 102a ... Convex part, 22a ... Concave part, 3 ... Light absorption board, CL ... Cylindrical lens, GT ... Groove, BS ... Bottom face, TB ... Transmissivity Glass beads, 100 ... projector, 200 ... lighting device

Claims (10)

A surface is formed by arranging a plurality of cylindrical lenses in a direction perpendicular to the longitudinal direction of each cylindrical lens, and a groove having a bottom surface inclined with respect to the perpendicular direction is formed on the back side of the plurality of cylindrical lenses. A lenticular lens having the longitudinal direction;
A convex portion and / or a concave portion which is disposed on the bottom surface corresponding to at least the end side of the lenticular lens and reflects the light having passed through the lenticular lens in the incident direction again, and has a center of the lenticular lens And a undulating portion that changes the state of the convex portion and / or the concave portion as the distance from the end portion to the end portion side increases along the longitudinal direction. The undulating portion has a linear shape extending in a direction in which the convex portion and / or the concave portion intersect the longitudinal direction,
The screen according to claim 1, wherein a plurality of the linear convex portions and / or concave portions are arranged in the longitudinal direction.   The screen according to claim 2, wherein a distance between the convex portions and / or concave portions of the linear shape is smaller as being provided in a peripheral portion of the screen. The convex portion and / or the concave portion of the linear shape is so small that the angle formed between the direction along the straight line and the longitudinal direction is provided in the peripheral portion of the screen,
The one end part arrange | positioned in the position close | similar to the said lenticular lens among the both ends of the said convex-shaped convex part and / or recessed part of the said linear shape is located in the center side of the said screen from the other end part. Item 4. The screen according to any one of items 3.   The screen according to any one of claims 2 to 4, wherein a height of the convex portion and / or a depth of the concave portion of the linear shape is larger as being provided in a peripheral portion of the screen.   The screen according to claim 2, wherein the undulating portion has a lenticular shape or a prism array shape on the bottom surface.   The screen according to any one of claims 1 to 6, further comprising a light absorbing material on at least a back side of the undulating portion and the bottom surface around the undulating portion on the back side of the lenticular lens.   The screen according to any one of claims 1 to 7, wherein the lenticular lens has an antireflection coating on a surface thereof.   The lenticular lens can be rolled up, and has a structure in which the longitudinal direction of the plurality of cylindrical lenses is arranged along a direction of a rolling axis. Item screen. A screen according to any one of claims 1 to 9,
A projection system comprising: an image projection device that projects a projection image on the screen.

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