CN100492163C - reflective screen - Google Patents

Abstract

A reflection type screen (1) capable of forming a bright, high-contrast, clear projection image even in a bright room, the screen (1) comprising a reflection layer (30) installed on the rear side of a projection-light incident surface, a horizontal-direction viewing-angle expanding layer (20) disposed on the incidence side of the reflection layer (30) so as to improve the horizontal-direction viewing angle of a projected light, and a diffusion layer (40) disposed on the incidence side of the expanding layer (20). The expanding layer (20) has a lenticular, prismatic or wavy convex stripe swelling toward the rear side so that the longitudinal direction of the convex stripe agrees with the vertical direction of the reflection screen (1), thereby improving the horizontal-direction viewing-angle characteristics of the screen (1), and controlling vertical-direction diffusion characteristics to prevent a disturbance light from above such as an illuminating light from reflecting in an observer direction. Accordingly, the reflection type screen has a high-contrast even in a bright room, can accommodate a large screen, and is free from a deterioration in CCR(center/circumference luminance ratio).

Description

reflective screen

technical field

The present invention relates generally to reflective screens, and more particularly to reflective screens for projecting video images and displayed video images, etc., by a projection device (projector) capable of displaying bright projected images with high contrast in a bright room.

Background technique

Prior art reflective screens include a screen substrate and a substrate made of a sheet of fiberglass or rayon, where such a woven sheet may be a layer of fiberglass impregnated with vinyl chloride resin, a synthetic resin layer of vinyl chloride, or aluminum metal layers; and reflective layers made of the aforementioned materials deposited on the surface of the screen substrate are known.

The above-mentioned reflective layer is formed by coating bead paint or bead ink, in which coating powder of titanium dioxide or mica fragments is dispersed in a binder made of Aluminum metal powder made of transparent resin or silver powder paint or ink. Furthermore, it is known to arrange a variety of transparent microbeads on the reflective layer to provide reflection.

Screens comprising a diffusing layer in which finely divided calcite crystal particles are dispersed in a binder as a light diffusing substrate with low light absorption, said layer being laminated on the aforementioned reflective layer is also known.

If the diffusion on the screen is excessively increased on a reflective screen, it will not be possible to distinguish between externally disturbing light and reflected light in a bright room, resulting in reduced contrast. Therefore, the degree of diffusion on the image surface should be suppressed to some extent.

Because there is a large difference in the horizontal direction between the incident angle of light in the peripheral area and the incident central area on a large incident size screen, which becomes very noticeable in a large screen with a screen aspect ratio of 16:9, So horizontal diffusion is necessary so that enough viewing angles can be obtained to cover angular differences. By reducing the diffusion angle of the screen, the gain in the direction of the front surface of the screen can be increased. At this time, viewing characteristics such as viewing angle and screen CCR (central ray/peripheral ray ratio) deteriorate.

Considering the above, the degree of diffusion should be suppressed to some extent to enhance the contrast of reflective screens in bright rooms, which requires reflective properties that can produce light diffusion to increase the viewing angle in the horizontal direction.

Patent Document 1 (Japanese Laid-Open Patent Publication No. H11-38509) discloses a prior art reflective screen having the structure shown in FIG. 60 . The reflective screen 110 includes a light diffusing layer 118 formed on the surface 116A of the substrate 116 of the prism layer 112 for diffusing the projected image, and a plurality of prisms 120 in the form of strips of optically transparent material to The vertical direction of the screen extends and is arranged on the back surface 116B of the substrate 116 . Each prism 120 has portions in the shape of an equilateral triangle so that it has a given vertex angle and a given side length. The light absorbing layer 114 is placed parallel to the prism layer 112 such that it faces the prism group at the rear end of the prism layer 112 . The light absorbing layer 114 is black in order to sufficiently absorb the emitted light at the side opposite to the rear end.

External disturbing light R, which is often incident on the screen at a high incident angle, is absorbed by the light absorbing layer 114 by emission through the prisms in the reflective screen of Patent Document 1.

61 to 63 are views explaining the functions of the prisms on the reflective screen of Cited Patent Document 1, and only schematically show the prisms 120 and the substrate 116 constituting the reflective screen. Reflection at the interface between the parts of the prism 120 having different coefficients that are difficult to control is considered within the reflective screen of Cited Patent Document 1. Because the incident angle of light projected on the reflective screen 110 is in the range of 0-15 degrees in the horizontal direction, the light incident on the reflective screen 110 in the vertical direction is retroreflected, as shown in FIG. 61 . On the contrary, light incident on the reflective screen 110 at certain incident angles will pass through the first prism interface as shown in Figure 62, or pass through the second prism interface without being reflected on it as shown in Figure 63, and will be The absorbent layer 114 absorbs. Because of this behavior, there is a large difference in luminance of light between the central area and the peripheral area on the reflective screen 110, thereby degrading the viewing angle and CCR (screen/peripheral area luminance ratio) of the peripheral area. This deterioration of CCR is more pronounced if the screen is a wide screen.

As described above, the reflective screen 110 of cited Patent Document 1 is intended to improve projection light in a bright room by the operation of the prism 120 expanding in the vertical direction and by absorbing light having a high incident angle to the reflective screen 110. Contrast, to increase viewing angle. However, only light incident on the screen in the horizontal direction, such as sunlight incident on the room, is considered. As described above, by using the light absorbing layer 114 to absorb the diffused light incident in the extended horizontal direction, it is advantageous to improve the contrast. However, it does not take into account the case that the externally disturbing light is mainly incident on the reflective screen 110 from a higher position, such as a light bulb. In other words, when using the prism 120 extended in the vertical direction, it is impossible to absorb external disturbance light incident from a higher position.

In other words, if the screen of cited Patent Document 1 is used under the light of an indoor lighting lamp, most of the projected light incident on the peripheral area of the screen in the downward direction will pass through the prism 120 as shown in FIGS. 62 and 63 , and was eventually absorbed. Therefore, the projected light is not returned to the viewer and the screen appears darker. Considering the angle of incidence especially on wide screens, this darkness is even more noticeable.

Therefore, in view of the above, for reflective screens, excellent characteristics such as excellent contrast in a bright room, excellent viewing angle in the horizontal direction, and excellent CCR of the screen are required.

The present invention has been made in consideration of the above circumstances. An object of the present invention is to provide a reflective screen having high contrast even in a bright room, and a reflective screen having excellent horizontal viewing angle and excellent screen CCR in addition to high contrast.

Patent Document 1: Japanese Patent Publication, Publication No. H11-38509

Contents of the invention

A first technical means of the reflective screen of the invention resides in a reflective screen comprising a diffusing layer for limiting the diffusion of light and a reflective layer for reflecting light rays emitted through said diffusing layer.

A second technical means of the reflective screen of the present invention resides within a reflective screen in which the light spread in the horizontal direction is relatively greater than in the vertical direction.

The third technical device of the reflective screen of the present invention resides in the reflective screen, which includes a diffusion layer for limiting the diffusion of light, a horizontal viewing angle increasing layer for increasing the horizontal viewing angle, and a reflective layer for reflecting from the projection light incident The side in turn passes through the horizontal viewing angle increasing layer to emit light from the reflective layer.

The fourth technical means of the reflective screen of the present invention resides in the reflective screen of the third technical means, wherein the horizontal viewing angle increasing layer is constituted such that various ridges can be arranged successively, and the apex of each ridge is placed on one side of the reflective layer.

The fifth technical device of the reflective screen of the present invention resides in the reflective screen of the fourth technical device, wherein the horizontal viewing angle increasing layer is constructed as a structure in which a plurality of convex ridges are arranged successively, and the various convex ridges are successively arranged Positioned so that the longitudinal direction of each of said raised ridges is aligned with the vertical direction of said reflective screen.

A sixth technical means of the reflective screen of the present invention resides within the reflective screen of the fourth technical means, wherein the pitch between said array of raised ridges is 200 microns or less, preferably 155 microns or less .

A seventh technical means of the reflective screen of the present invention resides within the reflective screen of the fifth technical means, wherein the pitch between the arrayed ridges is 200 microns or less, preferably 155 microns or less Small.

The eighth technical means of the reflective screen of the present invention resides in the reflective screen of any one from the fourth to seventh technical means, wherein the cross-section of the ridge of the horizontal viewing angle increasing layer is cylindrical.

A ninth technical means of the reflective screen of the present invention resides in any one of the reflective screen from the fourth to seventh technical means, wherein the cross-section of the ridge of the horizontal viewing angle increasing layer is prism-shaped.

A tenth technical device of the reflective screen of the present invention resides in any one of the reflective screen from the fourth to seventh technical devices, wherein the cross-section of the ridge of the horizontal viewing angle increasing layer is wavy.

The eleventh technical device of the reflective screen of the present invention resides in the reflective screen of any one of the third to seventh technical devices, wherein the reflective layer is placed in a non-bonding manner at the horizontal viewing angle Add layers to the back side.

The twelfth technical device of the reflective screen of the present invention resides in any one of the reflective screens of the third to seventh technical devices, wherein the reflective layer is bonded to the horizontal viewing angle increasing layer through a bonding layer rear side.

The thirteenth technical device of the reflective screen of the present invention resides in the reflective screen of the eleventh technical device, wherein the ridge cross-section of the horizontal viewing angle increasing layer is cylindrical, and the reflective layer is placed Between the focal position of the cylindrical lens formed by the cylinder and the apex of the ridge.

The fourteenth technical device of the reflective screen of the present invention resides in the reflective screen of the twelfth technical device, wherein the ridge cross-section of the horizontal viewing angle increasing layer is cylindrical, and the reflective layer is placed Between the focal position of the cylindrical lens formed by the cylinder and the apex of the ridge.

The fifteenth technical device of the reflective screen of the present invention resides in the reflective screen of the thirteenth technical device, wherein the distance between the reflective layer and the apex of the ridge of the horizontal viewing angle increasing layer is the 1/7 or less of the distance between the focal position of the cylindrical lens and the apex of the ridge of the horizontal viewing angle increasing layer.

The sixteenth technical device of the reflective screen of the present invention resides in the reflective screen from the fourteenth technical device, wherein the distance between the reflective layer and the apex of the ridge of the horizontal viewing angle increasing layer is the 1/7 or less of the distance between the focal position of the cylindrical lens and the apex of the ridge of the horizontal viewing angle increasing layer.

The seventeenth technical means of the reflective screen of the present invention resides in the reflective screen of the eleventh technical means, wherein the distance between the reflective layer and the horizontal viewing angle increasing layer is adjustable.

The eighteenth technical device of the reflective screen of the present invention resides in the reflective screen from the twelfth technical device, wherein the reflective layer is partially bonded to the horizontal viewing angle increasing layer and has a A medium of a refractive index of the index of the horizontal viewing angle increasing layer is placed between the horizontal viewing angle increasing layer and the bonding layer at a non-bonding position between the reflective layer and the horizontal viewing angle increasing layer.

The nineteenth technical device of the reflective screen of the present invention resides in the reflective screen of any one of the fourth to seventh technical devices, wherein the reflective layer is formed at the level by vacuum deposition or coating technique Viewing angle increasing layers are arranged on the surface of the ridges.

The twentieth technical device of the reflective screen of the present invention resides in the reflective screen of any one of the fourth to seventh technical devices, wherein the reflective layer is formed of Reflective sheet composition.

The twenty-first technical device of the reflective screen of the present invention resides in the reflective screen of any one of the third to seventh technical devices, wherein the diffusion layer is composed of beads and/or dyes dispersed therein as a diffuser Material transparent resin bond formation.

The twenty-second technical means of the reflective screen of the present invention resides within the reflective screen of the twenty-first technical means, wherein said diffusion layer comprises at least A distinct plurality of layers, and wherein the surface roughness and internal haze factor of the diffusion layer are independently controlled.

The twenty-third technical device of the reflective screen of the present invention resides in the reflective screen of any one of the third to seventh technical devices, wherein the reflective screen includes a dyed layer containing paint, the dyed layer The layer is stacked on the side of the projected image light incident side opposite to the horizontal viewing angle increasing layer.

The twenty-fourth technical device of the reflective screen of the present invention resides in any one of the reflective screen from the third to seventh technical devices, wherein the reflective screen includes a black matrix layer formed with a black matrix, so The black matrix layer is laminated on a side of the projected image light incident side opposite to the horizontal viewing angle increasing layer.

The twenty-fifth technical device of the reflective screen of the present invention resides in any one of the reflective screen from the third to the seventh technical devices, wherein the reflective screen includes a substrate made of a transparent resin sheet, the A substrate is laminated on a side of the projected image light incident side with respect to the horizontal viewing angle increasing layer.

A twenty-sixth technical means of the reflective screen of the present invention resides in the reflective screen of any one of the fourth to seventh technical means, wherein said horizontal viewing angle increasing layer comprises a layer in which a row of said ridges is formed sheet substrate.

The twenty-seventh technical device of the reflective screen of the present invention resides in a reflective screen for receiving light projected from a projection device placed in front of said screen to form a projected image, said the screen has a long horizontal shape and is used in a room where external disturbing light is mainly incident from above, the projection device includes a light diffusing part, and a viewing angle increasing and reflecting part for reflecting projected light emitted through the light diffusing part, and It is possible to increase a viewing angle in a horizontal angle and reflect external disturbing light emitted through the light diffusion part in a downward direction.

The twenty-eighth technology means of the reflective screen of the present invention resides within the reflective screen of the twenty-seventh technology means, wherein the screen has a viewing angle of 15° or greater.

The twenty-ninth technical means of the reflective screen of the present invention resides within the reflective screen of the twenty-seventh or twenty-eighth technical means, wherein the distance between the screen and the viewer is 1.5 meters or more.

The thirtieth technical device of the reflective screen of the present invention resides in the reflective screen of the twenty-seventh or twenty-eighth technical device, wherein the viewing angle increasing and reflecting portion is formed with concavities and convexities arranged in a horizontal direction , and the concave and convex surfaces extend in the vertical direction of the reflective screen.

The thirty-first technical means of the reflective screen of the present invention resides within the reflective screen of the twenty-seventh or twenty-eighth technical means, wherein the viewing angle increasing and reflective portion comprises a viewing angle increasing layer, and a reflective layer placed behind the viewing angle increasing layer.

Description of drawings

FIG. 1A is a view illustrating the behavior of illuminating light rays and light rays projected onto the screen by a projection device of one embodiment of the reflective screen of the present invention.

FIG. 1B is a view illustrating an embodiment of the reflective screen of the present invention and showing an example of the structure of the reflective screen having a weak diffusion layer and a reflective layer.

FIG. 2 is a diagram illustrating the behavior of illumination rays and rays projected by a projection device onto an uneven or rough-surfaced screen.

Fig. 3 is an example of viewing angle characteristics in the horizontal and vertical directions displayed on the reflective screen of the present invention.

Fig. 4 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 5 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 6 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 7 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 8 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 9 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 10 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 11 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 12 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 13 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 14 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 15 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 16 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 17 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 18 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 19 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 20 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 21 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 22 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 23 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 24 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 25 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 26 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 27 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 28 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 29 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 30 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 31 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 32 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 33 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 34 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 35 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 36 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 37 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 38 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 39 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 40 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 41 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 42 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 43 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 44 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 45 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 46 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 47 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 48 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 49 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 50 is a view illustrating still another embodiment of the reflective screen of the present invention.

Fig. 51 is a view illustrating a method of measuring the luminance of the reflective screen of the present invention.

Fig. 52 is a view illustrating a position for measuring the luminance of the reflective screen of the present invention.

FIG. 53 is a table showing measurement results of luminance at various luminance positions and calculation results of screen contrast on a reflective type screen.

FIG. 54A is a view simulating an optical path when the distance between the horizontal viewing angle increasing layer and the reflective layer is 0. FIG.

Fig. 54B is a view simulating the viewing angle characteristics corresponding to Fig. 54A.

FIG. 55A is a view simulating an optical path when the distance between the horizontal viewing angle increasing layer and the reflective layer is 20 μm.

Fig. 55B is a view simulating the viewing angle characteristics corresponding to Fig. 55A.

FIG. 56A is a view simulating an optical path when the distance between the horizontal viewing angle increasing layer and the reflective layer is 30 μm.

Fig. 56B is a view simulating the viewing angle characteristics corresponding to Fig. 56A.

FIG. 57A is a view simulating an optical path when the distance between the horizontal viewing angle increasing layer and the reflective layer is 140 μm.

Fig. 57B is a view simulating the viewing angle characteristics corresponding to Fig. 57A.

FIG. 58A is a view simulating an optical path when the distance between the horizontal viewing angle increasing layer and the reflective layer is 200 μm.

Fig. 58B is a view simulating the viewing angle characteristics corresponding to Fig. 58A.

FIG. 59 is a view simulating an optical path when the distance between the horizontal viewing angle increasing layer and the reflective layer is 60 μm.

FIG. 60 is a view showing the structure of a reflective screen disclosed in Japanese Laid-Open Patent Publication No. H11-38509.

Fig. 61 is a view showing the operation of the reflection type screen disclosed in Japanese Laid-Open Patent Publication No. H11-38509.

Fig. 62 is another view showing the operation of the reflection type screen disclosed in Japanese Laid-Open Patent Publication No. H11-38509.

Fig. 63 is another view showing the operation of the reflection type screen disclosed in Japanese Laid-Open Patent Publication No. H11-38509.

Detailed ways

Now, the present invention will be described by way of an embodiment of a reflective screen with reference to the accompanying drawings. Components having similar functions are denoted by the same reference numerals throughout the drawings, and repeated descriptions thereof are omitted.

The reflective screen of the present invention has high contrast and excellent horizontal viewing angle and CCR even in a bright room. The contrast of the image displayed on the screen in the optical space is low due to the fact that the light projected by the projection device and the room lighting light create external disturbances affecting the viewer. Therefore, by using the difference in the angle of incidence between the light from the projection device and the external interference light used for lighting with respect to the screen, the reflection directions of the two can be separated to achieve the purpose of improving the contrast in bright rooms, so that only The light projected by the projection device affects the viewer as much as possible.

In order to achieve the above function, the light projected from the projection device placed in front of the screen is reflected by mirror reflection in front of the screen, and the external disturbance light from the illumination light incident on the screen from a higher position in an oblique direction The downward direction is reflected, so the contrast in a bright room can be improved.

Since the image cannot be viewed if the incident light rays are only mirror-reflected and no diffusion occurs at the image surface at this time, it is necessary to diffuse the projected light rays on the image surface.

1A and 1B are views illustrating an embodiment of a reflective screen of the present invention. Figure 1A shows the behavior of illumination rays and rays projected by a projection device on a screen with reflective and image surfaces with weakly diffusive properties. FIG. 1B shows an exemplary structure of a reflective screen with a weak diffusing layer and a reflective layer whose degree of diffusion of light is obtained. The first embodiment of the reflective screen of the present invention includes a diffuser layer 40 of which the degree of diffusion is suppressed, and a reflective layer 30 for reflecting light incident on the reflective screen and emitted through the diffuser layer 40, as shown in FIG. 1B . The diffusion layer 40 has a weak diffusion property as described in s below and can limit the diffusion of external disturbance light in the vertical direction, and the external disturbance light is incident from a higher position of the reflective screen 1 . The light used for external disturbance is reflected towards the audience I, thus preventing the reduction of contrast.

When the illuminating light C from the illuminating source B is reflected on the reflective screen 1 in the direction H, the spread of the reflected light can be indicated by "G" in FIG. 1A. The component of the diffuse light in the direction of viewer I is denoted by "J". When the light F projected from the projection device P is reflected on the reflective screen 1 in the direction E, the diffusion of the reflected light can be indicated by "D", and the component of the diffused light in the direction towards the audience I can be indicated by "K". . At this time, the length ratio of J to K can be expressed as a measure of the influence of external light.

An example is described with reference to FIG. 2 in which an uneven screen having a high degree of diffusion is used with a diffusion layer instead of having the above-mentioned weak diffusion layer. When the illuminating light C from the illuminating source B is reflected on the screen A in the H direction, the spread of the reflected light is indicated by "0". The component of the diffuse light towards the viewer I is indicated by "L". When the light F projected from the projection device P is reflected on the screen A in the direction E, the spread of the light in this direction is indicated by "N". The diffuse ray component towards the viewer I is indicated by "M". At this time, the length ratio of L to M can be expressed as a measure of the influence of external light.

When the projected ray is fully diffused on the screen, the ratio of the reflected intensity becomes a circle independent of the angle of incidence. The radius of this circle, expressed as a ratio of reflected intensity, can vary according to the incident illuminance. The shape of the reflected intensity ratio on an uneven screen is slightly elongated compared to the fully diffused ring shape shown in Figure 2 above. On weakly diffused screens, the shape of the intensity ratio of the diffused rays is considerably elongated, as shown in Figure 1A. Diffusion in which the reflected intensity ratio shape of the diffuse ray is elongated compared to a ring is called "weak diffusion", and "limited diffusion".

Provided that a screen has a light-diffusing layer on its image surface so that a viewer can view an image, it has been frequently used. However, it is a feature of the present invention that the effect of the shape of the reflected intensity ratio from circular to elliptical (D, G in FIG. 1A and O, N in FIG. 2 ) according to the degree of diffusion on the light diffusing layer can be conveniently Applied to improve the contrast of projected images in bright rooms where light sources such as lighting rays etc. are above the screen.

As described above, if the degree of diffusion of the image surface is excessively increased on a reflective type screen, external disturbance light cannot be distinguished from projected light, resulting in a decrease in contrast. Therefore, it is necessary to provide a weak diffusion layer in which the degree of diffusion of the image surface is suppressed to some extent.

The first embodiment of the reflective screen of the present invention comprises: basic components, a diffusion layer 40 having weak diffusion properties and wherein the degree of light diffusion is suppressed, and a reflective layer 30 for reflecting light passing through the diffusion layer 40, as shown in FIG. 1B. The diffusion layer 40 focuses the projected image and has viewing angle characteristics that depend on the degree of diffusion. The reflection layer 30 can increase the reflection efficiency of light projected by the projection device. The diffusion layer 40 also reduces ghost images of the projector lens due to reflections on the screen surface and due to insufficiently diffused hot spots and hot spots.

As described above, in the current embodiment, the contrast between projected light and external disturbing light from above the screen can be improved by using reflection intensity ratios defined with different degrees of diffusion. A preferred contrast ratio depending on external disturbing light can be obtained by providing a weak diffusion layer with an appropriate value.

The reflective layer 30 also contributes to an increase in reflection factor and an improvement in contrast ratio because the reflective layer 30 reflects external disturbing light emitted from the bulb through the diffuser layer 40 in a downward direction so that it is not incident on the viewer's eyes.

The reflective screen of this embodiment includes a diffusion layer 40 and a reflection layer 30, and the diffusion layer 40 has weak diffusion properties. The most preferred weak diffusion characteristics are that the transmission factor of all light is not lower than 80% and the haze coefficient is 75±10%. The reflective layer 30 is composed of aluminum and has a mirror-forming surface. A decrease in contrast due to external disturbance light from above the screen and insufficient diffusion can be prevented by using a weak diffusion layer having such characteristics, so that a projected image with excellent contrast can be obtained. For example, if the angles of light incident on the central and peripheral areas of the screen are not much different depending on the distance of the projection and the size of the screen, then projections with excellent contrast can be obtained when viewing them in front of the screen image. The diffusion layer 40 and the reflective layer 30 having weak diffusion properties are included in various embodiments described below.

Now, other embodiments of the present invention having a characteristic of increasing the viewing angle in the horizontal direction will be described. Because the angle of light incident on the peripheral area and the central area of a large-sized screen with a screen aspect ratio of 16:9 is very different in the horizontal direction, and this screen will become the mainstream, horizontal diffusion is necessary, so that a viewing angle sufficient to cover the angular difference can be obtained.

The next feature of the present invention is to provide an increase and a reflective part reflecting the horizontal viewing angle of light emitted from the diffusion layer 40, so that the light can certainly be diffused in the horizontal direction (the reflective part corresponds to the horizontal viewing angle increasing layer in the embodiment to be described below. and reflective layers). This increases the horizontal viewing angle and prevents deterioration of the CCR.

If, as shown in cited Patent Document 1, in the case where an absorbing layer is provided, projected light from a projection device incident on a large-sized screen is to be emitted through a prism according to the above-mentioned incident angle, the emitted light will be Absorbed and not reflected. On the contrary, the structure of the present invention prevents deterioration of the CCR because most of the light incident on the screen is reflected.

A further embodiment of the reflective screen of the present invention which will be described below basically comprises a diffuser layer forming an image of the projected light rays and a horizontal viewing angle increasing layer for increasing the horizontal viewing angle which is added to the reflective layer for increasing the projection from the projected The reflection efficiency of light projected by the device.

The diffuser layer forms an image that reflects light and improves the contrast ratio by providing a screen with optically diffuse properties. The diffusion layer also reduces the formation of projector prism ghost images due to reflections on the screen surface and hot spots or hot spots due to insufficient diffusion. If the degree of diffusion of projected light on the image surface is excessively increased, projected light in a bright room cannot be distinguished from external disturbing light, resulting in a decrease in contrast. Therefore, the diffusion layer should be a weak diffusion layer in which the degree of light diffusion is suppressed. In the embodiment of the present invention to be described with the horizontal viewing angle increasing layer, it is preferable to use a diffusion layer with diffusion properties (wherein the transmission factor of all light is not lower than 80% and the haze coefficient is 75±10%). Apart from this limitation, the diffusion characteristics can be chosen appropriately, which provides the best contrast ratio according to the specifications of the screen and the projection equipment or installation using the screen.

The light diffusion portion defined in claim 24 corresponds to a diffusion layer in an embodiment to be described later. The viewing angle increasing and reflecting portion defined in claim 24 corresponds to a horizontal viewing angle increasing layer and reflecting layer in an embodiment to be described later. The viewing angle increasing layer defined in claim 28 corresponds to a horizontal viewing angle increasing layer in an embodiment to be described later.

Referring now to FIG. 3, this figure shows an example of the horizontal and vertical viewing angle characteristics on a reflective screen of the present invention having a horizontal viewing angle increasing layer for increasing the viewing angle in the horizontal direction. The axis of abscissa represents the viewing angle (degrees) and the axis of ordinate represents luminance (gain). Shows the difference in horizontal and vertical properties. The reflective screen of the present invention is anisotropic as shown in the figure, and exhibits large differences in the horizontal and vertical directions. Due to this characteristic, there is provided a reflective screen that has a wide viewing angle in the horizontal direction and in which high contrast can be obtained by suppressing reflection of external disturbing light from illumination light placed at a high position toward the viewer.

4 to 6 are views illustrating other embodiments of the reflective screen of the present invention. The structure of the horizontal portion of the screen is schematically depicted. The symbols i and o schematically represent schematic optimal paths for explaining the functions of the present invention. The embodiments to be described also use the same reference numerals. 4 to 6, reference numeral 1 denotes a reflective screen; 10, a transparent resin sheet; 20, a horizontal viewing angle increasing layer; 30, a reflective layer; 40, a diffusion layer; 41, beads of acrylic resin, and 42 Transparent resin bonding agent.

The reflective screen 1 includes a diffusion layer 40 formed on one side of a transparent resin sheet 10 as a substrate. The horizontal viewing angle increasing layer 20 is formed on the other side of the transparent resin sheet 10 . The reflective layer 30 is placed on the outer surface of the horizontal viewing angle increasing layer 20 . Light projected from the projection device is incident on the diffusion layer 40 side. In other words, in the reflection type screen of this embodiment, the diffusion layer 40, the transparent resin sheet 10, the horizontal viewing angle increasing layer 20, and the reflection layer 30 are sequentially stacked from the side where projected image light is incident.

A diffusion sheet using a transparent resin bond 42 in which beads of acrylic resin are dispersed as a diffusion material may be preferably used as the diffusion layer 40 to achieve weak diffusion. The transparent resin bonding agent 42 is a colorless material having excellent optical characteristics and a high transmission factor. By using the acrylic resin bead bonding agent, the surface of the diffusion layer 40 where projection light is incident becomes like an uneven surface. This uneven surface results in random reflections of incident light, thus reducing the reflection of the incident portion on the surface to provide an excellent image.

As described above, a diffusion sheet having a thickness of, for example, about 100 μm and a transmission factor of not less than 80% for all light rays and a haze coefficient of 75±10% can be preferably used.

As the diffusion material dispersed in the diffusion layer 40, urethane beads or styrene beads as well as the above-mentioned acrylic resin beads can be used. Diffusion materials of other dye types may be used. Because dye-type diffusing materials absorb light, which reduces the efficiency and, in turn, the transmission factor, the use of beads as described above is preferred. Although dye-type diffusing materials can provide an increased degree of diffusing. Since the present invention does not require strong diffusion, these bead diffusion materials provide the necessary degree of diffusion. The higher the transmission factor of the diffusion layer 40 is, the more incident light rays are emitted from the diffusion layer 40 to the horizontal viewing angle increasing layer 20 , so that the light returning to the viewer or audience is more easily affected by the horizontal viewing angle increasing layer 20 .

The diffusion layer 40 is laminated by bonding on one side of the transparent resin sheet 10 as a substrate on which projection light is incident. Any bonding agent that does not degrade optical properties can be used for this laminated structure. Alternatively, any bonding agent material that adds a diffusion effect may be applied on the surface of the transparent resin sheet 10 to form a layer after processing the resin sheet. At this time, a photocurable or thermosetting bonding agent material may be used, or a bonding agent material that swells or dissolves in a solvent may also be used on the transparent resin sheet 10, and thereafter evaporate the solvent to form layer.

Alternatively, in order to form the diffusion layer 40, a technique is required which extrudes the powder or beads of the transparent resin bonding agent 42 mixed with the light diffusing material in a T-shape by an extruder for forming a melt on the transparent resin sheet 10. or a layer in a semi-molten state and cool it thereafter.

The horizontal viewing angle increasing layer 20 can increase the viewing angle in the horizontal direction and is made on one side of the sheet on which the ridges are successively arranged. The horizontal viewing angle increasing layer 20 is formed such that the apex of each ridge is located on the side opposite to the side where the projected light is incident. The above-mentioned sheet on which continuous ridges are arranged may include a lens lens sheet on which cylindrical shapes are successively arranged, a prism-shaped sheet in which each ridge is prism-shaped in cross section, or a prism-shaped sheet in which each ridge is prism-shaped in cross section. For wavy wavy sheets. The expression "arrangement of continuous ridges" means an arrangement in which convexes and concaves are aligned in the horizontal direction and they extend in the vertical direction on the reflective screen.

FIG. 4 shows an exemplary structure of the horizontal viewing angle increasing layer 20 made of the above-mentioned lenticular sheet. FIG. 5 shows an exemplary structure of a horizontal viewing angle increasing layer made of a prism-shaped sheet. FIG. 6 shows an exemplary structure of a horizontal viewing angle increasing layer made of a corrugated sheet. Sheets with lenticular, prismatic, or corrugated cross-sections preferably have a thickness of 200 microns or less. The pitch between the ridges is 200 microns or less (1/10 or less of the pixel size). In the case of a prism shape, the apex angle is preferably 100°±10%. If the apex angle of the prism is 90°, light rays incident on the prism will be reflected to the surface of the prism. The audience behind the projection device can collect these rays by increasing the apex angle to 100°±10%. It will be appreciated that by bending the vertices of the prisms and the valleys between the arrayed prisms, a wave shape can be obtained.

As shown by the optical paths i and o in FIG. 4, the horizontal viewing angle increasing layer 20 only contributes to the diffusion characteristic in the horizontal direction. The screen is constructed so that, when the screen is installed, perpendicular to the ridges, the expanding direction (longitudinal direction of each ridge) such as the arrangement direction of lenses is aligned along with the vertical direction. This structure increases the degree of diffusion in the horizontal direction and is used to increase the viewing angle in the horizontal direction. This function of the horizontal viewing angle increasing layer 20 causes the anisotropy (that is, the diffusion characteristic) of the reflective properties of the screen in the vertical direction and the horizontal direction, so as to prevent the contrast reduction caused by external interference light in the vertical direction without preventing the contrast caused by the vertical direction. The weak diffusion layer 40 restricts the diffusion characteristics, and enhances the viewing angle characteristics of projected image light in the horizontal direction by diffusing the reflected light, thus increasing the viewing angle in the horizontal direction. In other words, the distribution of viewing angles in the horizontal direction of the screen changes due to the appearance of the horizontal viewing angle increasing layer 20 , while the distribution of viewing angles in the vertical direction does not change. More precisely, although the distribution of viewing angles in the vertical direction does not change, the peak magnitude of the gain still changes. Because the projection lens of the projection device has a depth of field, the lens has an imaging range in its depth of field. Therefore, the projected rays are imaged twice due to the reflection on the reflective layer 30 of current reflective screens.

While the shape and curvature of the ridges of the horizontal viewing angle increasing layer 20 can be optimized, it is also necessary to consider the distribution of diffusion which also affects the viewing angle and light collection (separate rays from total reflection) within the diffuser layer 40 . It is also necessary to shorten the optical path length between the first and second images and to pay attention to the distribution of reflected light within the diffusion layer 40 .

When the light incident on the horizontal viewing angle increasing layer 20 is refracted on the surface of the ridge, it is emitted therefrom, and is reflected on the reflective layer 30 and is incident on the surface of the ridge again and after being subjected to the action of the surface of the ridge exists in it. At certain angles of incidence, incident light rays are reflected on the surface of the ridge, and the reflected light is then incident on other parts of the surface of the ridge and is subject to effects such as refraction and reflection. Depending on the shape of the ridge, some light rays are reflected on the surface of the ridge and projected on the front surface of the screen without passing through the reflective layer 30 .

If the ridge has a cylindrical cross-section, refraction occurs along the cylindrical surface therein. Therefore, the rays reflected by the ridges and the reflective layer 30 are constantly expanding. Thus, the change in CCR is small. A shape having a cylindrical shape has a wider horizontal viewing angle than a shape having a prismatic cross-section. Ridges with a prism-shaped cross-section provide higher retroreflection, but the viewing angle can be increased through optimization of the prism's apex angle and Fresnel reflection brought about by the reflective layer 30 . Ridges with a wavy cross-section provide an effect similar to ridges with a prismatic cross-section, since these vertices can be considered as vertices of a cylinder, with reflective properties in which light rays are continuously expanded compared to ordinary reflection.

The reflective layer 30 is provided to increase utilization efficiency of image light projected from the projection device. The reflective layer 30 includes a flat reflective plate with a high reflectance factor on the surface, and the reflective layer 30 is placed on one side of the horizontal viewing angle increasing layer 20 with a raised ridge formed thereon. In this embodiment, it is only required that the reflective layer 30 is near the horizontal viewing angle increasing layer 20 . Lamination with a bonding agent layer is not necessary. For example, a reflective plate having a given hardness is used as the reflective layer 30 . The reflective plate formed on the transparent resin sheet 10 is safe to the frame of the reflective screen 1 . The reflective surface of the reflective layer 30 may be formed by covering the substrate with silver or aluminum, for example, by vacuum deposition or coating techniques.

When a reflective screen is fabricated by using the above-mentioned reflector, the central portion of the reflector is preliminarily deflected toward the direction of the horizontal viewing angle increasing layer 20 to bend the reflector, so deterioration of characteristics of the reflector due to aging can be reduced. If the gap between the reflective layer 30 and the horizontal viewing angle increasing layer 20 increases, then the diffusion characteristics will change. In order to prevent this, the reflection plate is bent toward the projection direction of the horizontal viewing angle increasing layer 20 at the center portion of the reflection plate. In this case, the peripheral frame of the reflective plate is secured so that the reflective plate can closely contact the horizontal viewing angle increasing layer 20 . Therefore, when the reflective plate holds internal tension that causes the reflective plate to be in close contact with the horizontal viewing angle increasing layer 20, widening of the gap between the reflective plate and the horizontal viewing angle increasing layer 20 can be suppressed by protecting the reflective plate.

The above technique can also be used for the horizontal viewing angle increasing layer 20 and the portion on one side of the reflection plate. In this case, the horizontal viewing angle increasing layer 20 is bent so that its center portion is projected toward the reflection plate, and then they are required to be stacked and protected from each other. Alternatively, the above technique can bend the reflective plate and the horizontal viewing angle increasing layer 20 and stack and protect each other.

Referring now to FIG. 7, this figure schematically shows the structure of still another embodiment of the reflective screen of the present invention. The structure shown is the intersection of this screen. The reflective screen of the present invention further includes a tinting (TINT) layer 50 formed on the light incident side of the diffusion layer 40 other than the structure of FIG. 4 . The TINT layer 50 absorbs external disturbance light components to improve contrast.

If the transfer factor of the TINT layer 50 is too low, the brightness of the screen will decrease. Therefore, it is preferred that the transfer factor is about 70%. It is necessary to select a TINT layer 50 with a particularly flat transmission spectral distribution in the visual range and to select a high transmission factor only on the long wavelength side or both long and short wavelength sides to compensate for the spectrum of the light emitted from the projection device distribution and the spectral reflectance distribution of the rest of the screen.

Regarding the TINT layer 25, it is conceivable to adopt a method of directly die-dieting or coating a dye on the surface of this layer. In this example, for color trimming and transfer factor control, water soluble dyes will be used for dyeing. In short, in the present embodiment, the TINT layer 50 is formed by using a water-soluble mold for a die on the surface of the diffusion layer 40 . The TINT layer 50 is 25 microns thick. Alternatively, as the TINT layer 50 , a resin sheet to which dyeing is added or a resin sheet previously formed with a TINT layer on its surface may be used and laminated on the diffusion layer 40 .

Or the TINT layer 50 can be sandwiched between the transparent resin sheet 10 and the diffusion layer 40 as shown in FIG. 8 , or sandwiched between the transparent resin sheet 10 and the horizontal viewing angle increasing layer 20 as shown in FIG. 9 . If the TINT layer 50 can be formed on the surface of the diffusion layer 40 by coating in the structure of FIG. Haze factor caused by rough surfaces. The haze coefficient of the entire diffusion layer, inherently exhibited by the textured surface of the diffusion layer and the diffusion effects within the diffusion layer, will be reduced. Therefore, it is necessary to design the diffusion characteristics of the diffusion layer 40 in consideration of the variation in characteristics. In the structure shown in Figure 8, the placement of the TINT layer 50 is preferred. In this case, the back of the image is emphasized so that the displayed image looks more prominent.

The exemplary structure including the TINT layer 50 may be applied to a structure using the horizontal viewing angle increasing layer 10 having a prism shape and a wave shape as shown in FIGS. 5 and 6 , respectively. 10 and 11 show exemplary structures each having a TINT layer 50 on the light incident side of the diffusion layer 40 and the horizontal viewing angle increasing layer 20 made of a prism-shaped sheet and a corrugated sheet, respectively.

Fig. 12 is a view illustrating still another embodiment of the reflective screen of the present invention. The structure of the horizontal cross-section of the screen is shown. In FIG. 12, reference numerals 40a, 40b denote diffusion layers, 41a, 41b denote beads of acrylic resin used as diffusion means, and 42a, 42b denote transparent resin bonding agents.

In the structures of the foregoing embodiments, the diffusion layer 40 is a single-layer structure, but it is a multi-layer structure in this embodiment. Two diffusion layers 40a, 40b are laminated. The roughness of the light incident surface of the diffusion layer 40 and the diffusion layer 40 can be independently controlled by changing the particle size, material, content, and particle size distribution of the acrylic resin beads 41a, 41b dispersed in the diffusion layers 40a, 40b, respectively. The haze coefficient of (internal haze coefficient is independent of surface roughness). The particle size distribution can be controlled by varying the mixing ratio of beads with various particle sizes.

It is optimized to diffuse light reflected by the surface of the diffusion layer 40a by appropriately increasing the surface roughness of the diffusion layer 40a on its light incident side, so that it is difficult for viewers to see ghost images of projection equipment or indoor fluorescent lamps.

The appearance of hot spots or hot spots caused by projection device projector lenses can be reduced by increasing the haze coefficient of the diffusing layer 40b on its reflective side.

The two-layer diffusion layer 40 shown in FIG. 12 can be used for all the diffusion layers 40 of the foregoing embodiments. An exemplary structure of the screen includes a double diffusion layer and a diffusion layer 40 of the horizontal viewing angle increasing layer 20 made of the prism-shaped sheet and the corrugated sheet of FIGS. 13 and 14 , respectively. 12 to 14 for comparison, FIGS. 15 to 17 show exemplary structures in which the TINT layer 50 is placed on the light incident side of the diffusion layer. For comparison with the structure shown in FIG. 12 having a double diffusion layer 40, FIG. 18 shows a structure in which a TINT layer 50 is placed between diffusion layers 40a and 40b.

In the structure of each of the embodiments described above, the diffusion layer 40 can be formed by adding a transparent resin bonding agent for forming the diffusion layer 40 with TINT, so that it can also be used as the TINT layer. FIG. 19 shows an example in which the diffusion layer 40 of FIG. 4 is added with TINT. FIG. 20 shows an example in which TINT is added to the diffusion layer 40b on the reflective side of the diffusion layer 40 shown in FIG. 12 .

21 to 25 are views illustrating still another embodiment of the reflective screen of the present invention. A horizontal cross-section of this screen is schematically shown. In this embodiment, a part of the screen that does not contribute to light emission, that is, a part that does not form an optical path, is formed with the black matrix layer 60 containing black paint. External disturbing light from the illuminating lamp can be absorbed by forming the black matrix layer 60, which improves the visual effect of emphasizing the black area of the projected image. The black matrix is designed to most effectively enhance the visual effect without reducing brightness to match the design of the horizontal viewing angle enhancing layer 20 . The black matrix layer 60 includes, for example, black stripes. These stripes are placed in the vertical direction of the screen to match the spacing between the ridges of the convex surfaces of the horizontal viewing enhancement layer 20 such as lenticular lenses, prisms and waves.

The above-mentioned black matrix layer 60 may be laminated on the light incident side of the horizontal viewing angle increasing layer 20 at an appropriate position. FIG. 21 shows a structure in which the black matrix layer 60 is sandwiched between the diffusion layer 40 and the transparent resin sheet 10 . FIG. 22 shows where the black matrix layer 60 is laminated on the light incident side of the diffusion layer 40 . FIG. 23 shows a structure in which the black matrix layer 60 is sandwiched between the transparent resin sheet 10 and the horizontal viewing angle increasing layer 20 . FIG. 24 shows a structure in which a black matrix layer 60 is sandwiched between a diffusion layer 40 including two-layer diffusion layers 40 a , 40 b and a transparent resin sheet 10 . FIG. 25 shows a structure in which a black matrix layer 60 is sandwiched between two diffusion layers 40a and 40b. These structures can be used for the above-mentioned horizontal viewing angle increasing layer having a prism shape and a wavy shape.

As mentioned above, the TINT layer 50 and the black matrix layer 60 can enhance the visual effect by emphasizing the black areas of the projected image. At this time, the TINT layer 50 and the black matrix layer 60 absorb some projected light. This absorption serves the purpose of emphasizing black areas within the projected image. The amount of light absorbed is very small. This absorption is completely different from that of the light-absorbing sheet of the above-mentioned Patent Document 1 in the amount of absorption.

Fig. 26 is a view illustrating still another embodiment of the reflective screen of the present invention. The structure of the horizontal cross-section of the screen is schematically shown. In the above embodiments, the reflective layer 30 is placed on the horizontal viewing angle increasing layer 20 in a non-bonding manner. In this embodiment, the reflective layer 30 is bonded to the horizontal viewing angle increasing layer 20 by providing the bonding layer 70 . In order not to affect the effect of the shape of the ridge of the horizontal viewing angle increasing layer 20 , the bonding agent or glue used for the bonding layer 70 preferably has a different refractive index from the material of the horizontal viewing angle increasing layer 20 .

In this embodiment, the bonding layer 70 is formed on the surface of the reflective layer 30 , and then the bonding layer 70 is pressed on the surface of the ridge of the horizontal viewing angle increasing layer 20 . Accordingly, the reflective layer 30 may be bonded to the horizontal viewing angle increasing layer 20 with the bonding layer 70 interposed therebetween. At this time, the reflective layer 30 is partially bonded to the horizontal viewing angle increasing layer 20 in the vicinity of the concave surface and the convex ridge through the bonding layer 70 . The gap 71 may be filled with a medium having a refractive index different from that of the horizontal viewing angle increasing layer 20, such as grease.

For example, when the reflective layer 30 is bonded to the horizontal viewing angle increasing layer 20 with ridges having a height (thickness in the stacked structure direction) of 50 μm through a bonding layer 70 having a thickness of 20 μm, gaps are formed between the ridges 71 , so that all spaces between the horizontal viewing angle increasing layer 20 and the reflective layer 30 are not filled by the bonding layer 70 .

In the structure including the bonding layer 70, the above-mentioned gap 71 may be formed, or the space between the horizontal viewing angle increasing layer 20 and the reflective layer 30 may be completely filled with the bonding layer 70 made of a high-flow bonding agent or glue, which bonds The refractive index of the mixture or glue is different from that of the horizontal viewing angle increasing layer 20 .

The structure in which the reflective layer 30 is bonded to the horizontal viewing angle increasing layer 20 as described above can be applied to the reflective layer 30 of the foregoing embodiment. Fig. 27 is a view illustrating still another embodiment of the reflective screen of the present invention. In the figure, a horizontal cross-section of the screen is schematically shown. In this embodiment, the reflective layer 30 is formed by vacuum-depositing or coating a material that contributes to the reflective layer 30 on the surface of the horizontal viewing angle increasing layer 20 . The reflective layer 30 may be formed by vacuum-depositing, for example, silver or aluminum, or coating a material including these metals on the surface of the aligned ridges of the horizontal viewing angle increasing layer 20 . Alternatively, the reflective layer 30 may be formed by a sputtering technique.

Since the reflective layer 30 is a specular layer formed by vacuum deposition, sputtering, or coating silver or aluminum on its surface, its reflectance can be made higher and the gain toward the front of the screen can be enhanced. External disturbing light incident on the screen 1 at a large incident angle can be prevented from being reflected to the audience. By virtue of these functions, the reflective screen of the present invention can provide high contrast of projected images.

As described above, the structure of the reflective layer 30 formed directly on the horizontal viewing angle increasing layer 20 is applicable to the reflective layer 30 of each of the above-described respective embodiments. FIG. 27 shows an exemplary structure in which the reflective layer 30 of this embodiment formed by vacuum deposition or application is applicable to the structure shown in FIG. 4 . FIG. 28 shows another exemplary structure in which the reflective layer 30 described above can be applied to the structure shown in FIG. 7 . FIG. 29 shows the structure in which the reflective layer 30 is applicable to that shown in FIG. 8 . The reflective layer 30 shown in FIG. 30 can be applied to the structure shown in FIG. 12 . FIG. 31 shows the structure in which the reflective layer 30 is applicable to that shown in FIG. 21 .

Fig. 32 is a view illustrating still another embodiment of the reflective structure of the present invention. In the figure, a horizontal cross-section of the screen is schematically shown. In each of the above-described embodiments, the laminated structure can be achieved without using any transparent resin sheet 10 . In the structure shown in FIG. 32, the diffusion layer 40 is formed by directly forming an acrylic bead bond layer on the lens lens sheet constituting the horizontal viewing angle increasing layer 20 without using any transparent resin sheet 10 in the screen 1 of FIG. . Similarly, a laminated structure can be obtained by using the horizontal viewing angle increasing layer 20 as a substrate sheet without using any of the transparent resin sheets 10 in all the embodiments described above.

33 and 34 show structures using a prism-shaped sheet and a corrugated sheet, respectively, as the horizontal viewing angle increasing layer in the structure of FIG. 32 . 35 to 37 respectively show the structures shown in FIGS. 12 to 14 without using any transparent resin sheet 10 . 38 to 40 show structures in which TINT layers 50 are laminated on the light incident side of the diffusion layer 40 in the structures shown in FIGS. 35 to 37 , respectively. FIG. 40 shows an example of the screen formed without using any transparent resin sheet 10 and including a black matrix layer 60 in the structure of FIG. 21 .

42 to 44 show exemplary structures in which the horizontal viewing angle increasing layer and the reflective layer 30 having a cylindrical ridge arrangement directly formed on the transparent resin sheet 10 are formed by vacuum deposition or coating technology in a stripe arrangement. .

In FIG. 42, the horizontal viewing angle increasing layer includes cylindrical portions 21 having a partial cylindrical shape, which are integrally formed and successively arranged on one side of the transparent resin sheet 10 as a substrate. The cylindrical portion 21 is formed so that each cylindrical longitudinal direction (axis direction of the cylinder) corresponds to the vertical direction of the screen when the screen 1 is installed. Further, the cylindrical portion is formed so that the apex of the cylindrical portion 21 is located on the side facing the reflective layer 30 . The cylindrical portion 21 defines the shape of the reflective layer 30 . By forming the horizontal viewing angle increasing layer in this way, the diffusion range of the reflected light component in the horizontal direction of the screen 1 can be enlarged for enhancing the viewing angle characteristics of the screen 1 . Preferably, the pitch of the cylindrical parts is 200 microns or less (1/10 of the pitch of the apexes or less), more preferably 155 microns or less similarly to the above-mentioned embodiment.

The reflective layer 30 is formed on the surface of the cylindrical portion 21 . The diffusion layer 40 is laminated on the side of the transparent resin sheet 10 which is opposite to the side on which the cylindrical portion 21 is formed. The surface of the diffusion layer 40 is used as an incident surface of projection light. The screen 1 of the present embodiment includes a diffusion layer 40 , a transparent resin layer 10 to be a substrate, a cylindrical portion 21 , and a reflective layer 30 which are integrally formed sequentially from the projection light incident side.

The cylindrical portion 21 is formed by the process of coating a photosensitive curable resin on one side of the transparent resin sheet 10 . A mold or roll of a desired cylindrical shape is embedded in the transparent resin sheet 10 to form a cylindrical portion. Then, the transparent resin sheet 10 is bent in the light direction. Alternatively, the transparent resin sheet 10 may be formed directly by embedding a cylindrical roll in one side of the transparent resin sheet 10 during sheet formation of the transparent resin sheet 10 or in a subsequent step. Fine cylinders can be formed by optical fabrication methods such as laser or photolithography.

Fig. 43 is a view illustrating still another embodiment of the reflective screen of the present invention. A horizontal cross-section of the screen is schematically shown. In FIG. 43, reference numeral 30 denotes a reflective layer, 31 denotes a substrate, and 32 denotes a reflective sheet including the reflective layer and the substrate.

In the structure shown in FIG. 43 , the reflection layer 30 is formed by coating the reflection sheet 32 having reflection ability on the cylindrical portion 21 . In other words, the reflective sheet 32 having a substrate formed together with the reflective layer 30 is provided. The same function as that of the embodiment shown in FIG. 42 can be obtained by coating the reflective sheet 32 on the cylindrical portion 21 . The substrate 31 may be formed of a resin sheet. The reflective sheet 32 may be used in a case where a silver or aluminum layer is formed as the reflective layer 30 on the resin substrate 31 by vacuum deposition, sputtering, or coating techniques. Metal flakes, such as aluminum or silver, can be used as reflective layer 30 coated on substrate 31 . Alternatively, the above-mentioned separate metal foil may be used as the reflection sheet without using any resin substrate 31 . In the case of using metal foil, the structure is similar to that shown in Figure 42.

Fig. 44 is a view illustrating still another embodiment of the reflective screen of the present invention. A horizontal cross-section of the screen is schematically shown. In Fig. 44, reference numerals 40a, 40b denote acrylic resin beads used as diffusion materials, and 42a, 42b denote transparent resin bonding agents.

In the structure of FIG. 44, the diffusion layer 40 includes two diffusion layers 40a, 40b. The roughness of the light incident surface of the diffusion layer 40 and the diffusion layer can be independently controlled by changing the particle size, material, content, and particle size distribution of the beads 41a, 41b of acrylic resin dispersed in the diffusion layers 40a, 40b, respectively. Haze factor of 40 (internal haze factor is independent of surface roughness). The particle size distribution can be controlled by varying the mixing ratio of beads with various particle sizes.

By appropriately increasing the surface roughness of the diffusion layer 40a on the light incident side thereof, it is optimized to diffuse the light reflected by the surface of the diffusion layer 40a, so that it is difficult for the viewer to see the ghost image of the projection device or the indoor fluorescent lamp. Hot spots or hot spots can be reduced by increasing the haze coefficient of the diffuser layer 40b on its reflective side.

Although the reflective screen of the present invention has a row of ridges, such as the cylindrical portion 21, a multilayer screen can be formed by the above-mentioned structure shown in FIGS. 42 to 44 . This enhances the productivity of the screen and allows the user to handle the screen more easily.

45 to 47 show exemplary structures, wherein the horizontal viewing angle increasing layer is formed by a row of raised ridges having a prism cross-sectional shape formed directly on the transparent resin sheet 10, and a reflective layer is vacuum-deposited or coated on the raised ridges. superior. In these figures, reference numeral 22 denotes a prism-shaped portion.

48 to 50 show exemplary structures in which the horizontal viewing angle increasing layer is formed by a row of raised ridges having a prism cross-sectional shape directly formed on the transparent resin sheet 10, and a reflective layer is vacuum-deposited or coated on the raised ridges. superior. In these figures, reference numeral 23 denotes a wave-shaped portion.

In the exemplary structure using the prism-shaped portion 22 and the undulating portion 23, the cylindrical portion 21 in the structures shown in FIGS. 42 to 44 are replaced with the prism-shaped portion 22 and the undulating portion 23, respectively. Their operation is the same as in the embodiment of Figs. 42 to 44, except for the operation due to the shape of the ridge described above. Therefore, repeated descriptions of operations will be omitted.

The structure in which the horizontal viewing angle increasing layer is formed by directly forming the transparent resin sheet 10 with the cylindrical portion 21, the prism-shaped portion 22 or the corrugated portion 23 as shown in FIGS. 42 to 50 can be used for the horizontal viewing angle increasing of FIGS. Layer 20.

As described above, if the reflective layer 30 is formed by performing vacuum deposition, sputtering and coating, and adhesion of a reflective sheet on the horizontal viewing angle increasing layer 20 according to the shape of the ridges of the horizontal viewing angle increasing layer 20, the ridges The shape will determine the reflective properties since no gaps are formed between the ridges and the reflective layer 30, unlike the structures shown in Figures 4 to 41 that use a flat, plate-like reflective layer.

If reflection is performed on a cylindrical surface, the reflected ray will continue to expand horizontally relative to the incident ray, since the reflected ray is part of the cylinder. The obtained spread of the reflected light is greater than that of a structure using a flat reflective plate with a gap between the raised ridge and the reflective layer 30 . Screens having characteristics in which the viewing angle of the screen is also wide in the horizontal direction with respect to variations in the screen surface and CCR are rarely provided.

If reflection is implemented on a prism-shaped surface, when the apex angle of the prism is approximately 90°, light rays incident from the projection device will be retroreflected in the opposite direction to light rays incident on and towards the projection device and its vicinity. Provides excellent brightness when the viewer views the image on the screen close to the projection device. The divergence of the reflected light rays can be provided according to the invention by increasing the apex angle of the prism to 100° ± 10°.

Since the corrugated surface resembles a prismatic surface with rounded vertices, if reflection is performed by the corrugated surface, the screen has prismatic retroreflective and cylindrically extended reflective properties. Therefore, well-balanced characteristics of viewing angle, luminance, and CCR can be obtained.

If one or more of the transparent resin sheet 10, the horizontal viewing angle increasing layer 20, the reflective layer 30, and the diffusion layer 40 are laminated on another component in the above-mentioned embodiment, a bonding agent or a bonding agent may be used for the laminate. . To enhance the strength of the laminate, either one or both of the members to be laminated must be pre-surface-active treated, such as tip-discharged, or may be coated with a fixative. The above-mentioned bonding agent resin or bonding compound, bonding resin material, or fixing agent should have properties that do not hinder the optical characteristics of the screen or optimize properties such as refractive index and the like depending on the application site.

The above-mentioned bonding agent or bonding agent is a photosensitive curing or thermosetting bonding agent or bonding agent. They may be photocured or thermoset after application. Similarly, bonding agents or bonding partners that cross-link in the electronic direction may be used. By photocuring, thermal hardening or cross-linking, bonding agents or bonding agents increase their coefficient and change their bonding or bonding properties. It is desirable to stabilize the bonding or binding properties by, for example, increasing the viscosity. If optical lamination properties can be obtained by using a photocurable, thermally hardened or electronically cross-linked bonding agent or bonding agent, such bonding agent or bonding agent may be suitably employed.

A protective film can be coated on the surface of the screen to prevent soiling or damage to the screen surface. A protective film can be formed by laminating PET, PP, and materials with transparency and high surface hardness, which depend on the substrate of the bonding agent. Fluoropolymer resin sheets or coating materials may be laminated on the screen surface. This provides the characteristic and decontamination properties of the protective coating. A preferred protective sheet is an optical grade resin in which there are few fisheyes.

In order to prevent dust or foreign substances from being deposited on the screen due to electronic force, antistatic agents can be coated or sprayed on the surface of the screen. The antistatic agent can be incorporated in a protective sheet made of PET or PP. The antistatic agent can be incorporated in the transparent resin bonding agent 42 of the diffusion layer 40 .

An ultraviolet absorber may be used for inhibiting deterioration of the TINT layer 50 due to exposure to ultraviolet light. It is preferable that the ultraviolet absorbing agent is incorporated in a bonding agent or a bonding agent for lamination of the TINT layer 50 with a member (for example, the diffusion layer 40 ) on the light incident side of the TINT layer 50 . It may be incorporated in the diffusion layer 40 itself provided on the light incident side of the TINT layer 50, or a transparent sheet in which an ultraviolet absorber is incorporated may be laminated on the light incident side of the TINT layer 50. The UV absorber can be, for example, a benzotriazole agent.

In the above-described embodiments, the material of the transparent resin sheet 10 may include, for example, resin sheets of polyester, polymethylmethacrylate methacrylate, polypropylene, and nylon.

The material of the transparent resin bonding agent 42 may include vinyl acetate resin, modified vinyl acetate/acrylic copolymer resin, ethylene/acetate vinyl resin, polyester resin, acrylic copolymer resin, Acrylic silicone resin, cellulose resin, urethane resin, epoxy resin, modified ethylene polymer alcohol resin, acrylonitrile rubber. It should be understood that the present invention is not limited to these materials. Any suitable material may be used with the present invention.

An example of measuring the contrast on the reflective screen of the present invention will now be described. A screen having the structure shown in Fig. 23 is used. The surface of this screen can be divided into nine regions. The contrast ratio at each location was measured by measuring the brightness (gain) of the screen at separate center points.

FIG. 51 is a view explaining a method of measuring the luminance. The screen 1 can be made as a wide screen of 50 inches and having a size of 623×1107 mm. The luminance measurement device 102 was placed at a position where the normal n to the center of the screen 1 was 2500 mm from the surface of the screen. The external light source 100 is placed 1680 mm away from the surface of the screen 1 and moved 1000 mm upwards on the normal n. A projector (projection device) 101 is placed at a position 1660 mm away from the surface of the screen 1 and moved downward by 165 mm on the normal line n. It is assumed that the distance between the screen and the viewer (viewer) is not less than 1.5 meters.

FIG. 52 is a view explaining the luminance measurement position of the screen 1 . The surface of the screen 1 is equally divided into 9 regions, as shown in FIG. 52 . The screen brightness (gain) is measured at the center of each divided area. Luminance measurement is carried out by rotating the luminance measuring device.

Fig. 53 is a graph showing the measurement results of luminance at each measurement position and the calculation results of the contrast of the screen. The gain of projection light and the gain of external disturbance light were measured at the respective measurement positions 1 to 9 shown in FIG. 52 . Compute the image contrast for each location.

The contrast ratio is calculated as follows. (Projection light gain×projection light illuminance/π)+(external interference light gain×external interference light illuminance/π)/(projection light gain×projection light illuminance/π/contrast)+(external interference light gain×external Interference light illuminance/π).

The above projection light illuminance is 1015.71x (lux) obtained by dividing the total light flux of 700lm (lumen) by the projection area of 0.689 square meters. The illuminance of external disturbance light is 250lx. The projector itself has a contrast ratio of 1200:1.

The contrast ratios on the side of measurement positions 1 to 9 are (6.9:1), (7.2:1), (6.4:1), (25.3:1), (48.7:1), (24.9:1), (51.1: 1), (102.6:1), (49.2:1). If it is assumed that full diffusion occurs on the screen as a control example, then any projected rays and external interfering rays have a gain of 1 and the screen contrast ratio is 5.0:1. On the screen of the invention, excellent contrast can be obtained anywhere in a bright room. The viewing angle (half value) is 17.5°, which is not less than 15°.

Now, the relationship between the characteristics of the image formed on the screen and the distance between the horizontal viewing angle increasing layer 20 and the reflective layer 30 will be described.

In the structure in which the reflective plate is used as the reflective layer 30 shown in FIGS. 1 to 27, the distance between the reflective layer 30 and the horizontal viewing angle increasing layer 20 can be variably set. For example, the reflective layer 30 may be separated from the horizontal viewing angle increasing layer 20 .

As described above, when the light projected from the projection device is incident on the diffusion layer 40 and when the projected light reflected to the reflective layer 30 is emitted from the diffusion layer 40 again, 2x imaging occurs in the diffusion layer 40 which becomes the imaging layer at this time. Therefore, the greater the distance between the reflection layer 30 and the diffusion layer 40, the greater the defocus, resulting in deterioration of image quality. Therefore, it is mainly preferable that the distance (optical path) between the diffusion layer 40 and the reflection layer 30 be short. In other words, from a structural point of view, it is preferable that the horizontal viewing angle increasing layer 20 is close to the reflective layer 30 .

However, in order to optimize the characteristics of projected images and to rationalize the manufacturing process, the distance between the horizontal viewing angle increasing layer 20 and the reflective layer 30 may be slightly larger as required. At this time, the length of the optical path between the horizontal viewing angle increasing layer 20 and the reflective layer 30 has a tolerance on a practical level.

Now, when the distance between the reflective layer 30 and the horizontal viewing angle increasing layer 20 is large, if the optical path length between the diffuser layer 40 and the reflective layer 30 is large, the characteristics of the screen and the above-mentioned separation distance allowed by the screen will be considered .

54A to 54B are simulation results showing the optical path length and the horizontal viewing angle characteristics of the screen when a lenticular lens sheet is used as the horizontal viewing angle increasing layer 20, and the distance between the flat reflective layer 30 and the horizontal viewing angle increasing layer 20 is changed view. Wherein, the distance X between the horizontal viewing angle increasing layer 20 and the reflecting layer 30 (accurately, the distance between the apex of the horizontal viewing angle increasing layer 20 and the reflecting surface of the reflecting layer 30) is 0 (contact), 20 microns, 30 microns, 140 microns and 200 microns. 54A to 54B show optical path characteristics and viewing angle characteristics.

In particular, Figure 54A shows an optical path with a distance of zero. Fig. 54B shows the viewing angle characteristics corresponding to Fig. 54A. In particular, Figure 55A shows the optical path showing a distance of 20 microns. Fig. 55B shows the viewing angle characteristics corresponding to Fig. 55A. In particular, Figure 56A shows the optical path at a distance of 30 microns. Fig. 56B shows the viewing angle characteristics corresponding to Fig. 56A. In particular, Figure 57A shows the optical path at a distance of 140 microns. Fig. 57B shows the viewing angle characteristics corresponding to Fig. 57A. In particular, Figure 58A shows the optical path at a distance of 200 microns. Fig. 58B shows the viewing angle characteristics corresponding to Fig. 58A.

The various views of the optical path show the simulated results of the optical behavior when 20 light beams are incident on a cylindrical portion of the lens lens perpendicular to the screen surface. Brightnesses corresponding to divergences of reflected rays in the optical path length view are displayed in view angle characteristic views corresponding to the optical path length view, respectively. The cylindrical portion of the lens sheet is spaced 155 microns apart in the horizontal direction. The focal length of the cylindrical lens defined by each cylindrical portion is approximately 150 microns from the apex of the cylindrical portion.

In the simulation of viewing angle characteristics, diffusion in the diffusion layer 40 may not be considered. However, since a diffusion layer having the above-mentioned weak diffusion characteristics was used as the diffusion layer 40 of the present invention, it is considered that the result is actually the same as that obtained using an actual screen in this simulation.

Considering the viewer's viewing position on the reflective screen to which the present invention is applied, the viewing position of the viewer in the room is generally 2 to 3 meters away from the screen. If the viewer occupies a horizontal width of 1 meter, the viewer's viewing angle with respect to the normal line to that screen is expressed as follows:

tanθ=(number of viewers×1 meter)/(distance between screen surface and viewers). If the distance between the screen surface and the audience is 2.5 meters, the viewing angle θ of the audience viewing the screen at the maximum tilt angle is 22° and 39° when there are two and four audiences, respectively. It is preferable that the viewing angle of the screen is at least 15° or more, even considering the viewing distance and general condition of the viewer.

If the above situation is considered, the ideal horizontal viewing angle for about 4 viewers in the room to watch the image is 40°, then the viewing angle characteristics shown in Figure 3 are ideal. In other words, Figure 3 shows the horizontal viewing angle characteristics such that the half-value of the luminance (the angle at which half-value luminance is obtained in the central region (0°)) is approximately 40°, and as the angle of the central region (0°) The larger the absolute value of , the brightness will gradually change. Brightness changes abruptly with viewing angle, which is not preferred. According to the viewing angle characteristics shown in FIG. 3, the best viewing angle characteristics and high image quality can be obtained.

Considering the foregoing, the simulation of FIGS. 54A to 54B will be considered. When the distance X between the horizontal viewing angle increasing layer 20 and the reflective surface of the reflective layer 30 (in particular, the distance between the apex of the ridge of the horizontal viewing angle increasing layer 20 and the reflective surface of the reflective layer 30) is 0 (FIGS. 54A and 54B) and 20 microns (FIGS. 55A and 55B), the half-value is 40° and the brightness changes gradually. When the distance X is 30 micrometers (FIGS. 56A and 56B), the half-value reduction is 33°. When the absolute value of the angle becomes larger, then the brightness changes suddenly.

When the distance X is 140 microns (FIGS. 57A and 57B), which substantially corresponds to the focal position of the cylindrical part, most of the light rays will return to the center (0°) position, so that a sufficient viewing angle cannot be obtained. When the distance X becomes 200 micrometers larger than the focal length (FIG. 58A and FIG. 58B), the reflected light component with a larger viewing angle increases relatively while the property of light collected into the central (0°) region is maintained. However, the half value is about 5°, so the viewing angle will not be improved. The larger the above-mentioned distance X, the larger the defocus. Therefore, image quality deteriorates.

From the above, it can be concluded that the distance X between the reflective layer 30 and the horizontal viewing angle increasing layer 20 that provides the ideal viewing angle characteristics shown in FIG. 3 is in the range of 0 microns to 20 microns.

Even if four viewers are placed side by side, the ideal viewing angle characteristic of Fig. 3 can provide brightness greater than a given value. If, for example, two viewers are arranged horizontally, the viewing angle θ is 22° under the above conditions. It can be considered that the case where the distance X is close to 60 micrometers is allowed. Fig. 59 shows the viewing angle characteristics when the distance X is 60 µm.

When a viewer views an image on a screen, the viewer is generally centered in nature. Therefore, even if the light collected into the central area (0°) is large, major problems other than CCR deterioration do not arise.

However, the longer the distance X is, the more the above-described defocus and image quality deterioration also occur. As the distance X of the focus point position becomes longer, the light collected into the central area (0°) increases. When it goes beyond the focus position, the light component that diffuses to the peripheral area increases slightly again. Therefore, even considering the constraints of a viewer viewing the image on the screen, making the distance X greater than the focal length by no means means that only the defocus becomes greater thereafter.

It can be seen from the above that the distance X between the horizontal viewing angle increasing layer 20 and the reflective layer 30 should not be greater than the distance to the focal point of the cylindrical lens when a lenticular lens sheet is used. Preferably, the distance X is 60 microns or less, more preferably 20 microns or less.

In other words, the relationship between the distance between the apex of the cylindrical portion of the horizontal viewing angle increasing layer 20 and the focal point of the lens lens formed by the cylindrical portion (hereinafter denoted as “Y”) and the distance X is preferably 0≤X≤ 3Y/7, more preferably 0≤X≤Y/7. Because the focal length of the cylindrical lens (hereinafter expressed as "Z") is 180 microns, the relationship between the distance X and the focal length Z of the cylindrical lens is preferably 0≤X≤Z/3, more preferably 0≤X≤Z /9.

In the above embodiments, the distance between the horizontal viewing angle increasing layer 20 and the reflective layer 30 is mostly fixed. However, the distance X does not have to be constant according to the number of spectators mentioned above. It is possible to provide screens that are reflective efficiently by making the distance X vary with the number of spectators. If the distance X varies with the number of viewers to 0 microns, 20 microns, 30 microns, 60 microns or 140 microns, depending on the conditions of use, the most effective reflective screen can be provided.

Since the adjustment of the distance X is on the order of microns, the adjustment can be implemented by providing a fine adjustment mechanism, such as a micrometer, at appropriate positions, such as the four corners of the screen. If the screen has a large size, the distance can be controlled by driving a fine adjustment mechanism by means of electrical appliances such as motors.

Although in the above-described embodiments, the distance X is kept constant over the entire area of the screen, the distance X may vary from the central area to the peripheral area. That is, in the central area, the incident angle of light rays projected from the projection device P with respect to the screen surface is different in the central area than in the peripheral area. Therefore, it is effective to make the distance X of the central region different from the distance X of the peripheral region in terms of reflection efficiency. In general, the contrast on the screen can be improved if the screen is configured such that the distance X is shorter in the central area than in the peripheral areas. Instead of the above-mentioned adjustment of the distance X, it is also effective that the contour of the entire screen is slightly curved in the direction of the projection device P for the peripheral area.

The embodiments of the present invention have been described. As apparent from the foregoing, the present invention can provide reflective screens with high contrast even in bright rooms and excellent horizontal viewing angles and screen CCR. In particular, according to the invention, it is possible to provide in which, by means of a horizontal viewing angle increasing layer, the contrast in bright rooms can be improved by providing different reflective properties (diffusion) in the horizontal and vertical directions of the screen, i.e. by limiting the vertical Diffusion is used to improve contrast in bright rooms and reflective screens are used to improve contrast in bright rooms by relatively increasing the diffusion in the horizontal direction to obtain a wide viewing angle. This is also suitable for large-sized screens and does not deteriorate CCR.

The black in the projected image can be enhanced by absorbing external disturbing light by the TINT layer or the black matrix layer. By providing a reflective layer behind the horizontal viewing angle increasing layer, the reflective efficiency and gain in the direction towards the front of the screen can be enhanced. By forming a multi-layer diffusion layer and individually controlling the surface roughness of the light incident surface and the haze coefficient of the diffusion layer, the diffusion of reflected light on the surface of the diffusion layer and the reduction of hot spots or hot spots can be obtained.

Claims (13)

1. A reflective screen comprising: a front side diffusion layer having a weak diffusion property so that the shape of the reflected intensity ratio of the diffused light is elongated compared to the circular ring; Horizontal viewing angle increase layer, used to increase horizontal viewing angle; and a rear diffuser layer placed sufficiently close to said horizontal viewing angle increasing layer for reflecting light that has been emitted through said horizontal viewing angle increasing layer; wherein The horizontal viewing angle increasing layer is configured such that a plurality of ridges are arranged successively, and the apex of each ridge is placed on a side of the horizontal viewing angle increasing layer that is sufficiently close to the reflective layer, and The plurality of ridges are positioned such that the longitudinal direction of each of the ridges is aligned with the vertical direction of the reflective screen. 2. The reflective screen according to claim 1, wherein the reflective layer has characteristics such that the transmission factor for all light rays is not lower than 80% and the haze coefficient is 75±10%. 3. The reflective screen according to claim 1, wherein the cross-section of the ridge of the horizontal viewing angle increasing layer is cylindrical. 4. The reflective screen according to claim 1 or 2, wherein the reflective layer is placed on the rear side of the horizontal viewing angle increasing layer in a non-bonding manner. 5. The reflective screen according to claim 4, wherein the distance between the reflective layer and the horizontal viewing angle increasing layer is adjustable. 6. The reflective screen according to claim 4, wherein the cross-section of the ridge of the horizontal viewing angle increasing layer is cylindrical, and the reflective layer is placed on the ridge formed by the cylindrical shape. between the focal point of the cylindrical lens and the apex of the ridge. 7. The reflective screen according to claim 6, wherein the distance between the reflective layer and the apexes of the ridges of the horizontal viewing angle increasing layer is 100° between the cylindrical lens and the horizontal viewing angle increasing layer One-seventh or less of the distance between the vertices of the raised ridges. 8. A reflective screen as claimed in any one of claims 1 to 3, wherein the pitch between the arrayed ridges is 200 microns or less. 9. The reflective screen according to any one of claims 1 to 3, characterized in that, the horizontal viewing angle increasing layer is formed on the surface of the ridges arranged by vacuum deposition or coating technology. the reflective layer. 10. The reflective screen according to any one of claims 1 to 3, wherein the reflective layer is composed of a reflective sheet laminated on the surface of the ridge. 11. The reflective screen according to any one of claims 1 to 3, wherein the diffusion layer is composed of a transparent resin bond dispersed with beads and/or dyes as a diffusion material. 12. The reflective screen of claim 11, wherein said diffusion layer comprises multiple layers differing in at least one of particle size, type, content, and particle size of said diffusion material, and wherein said diffusion The layer's surface roughness and internal haze coefficient are independently controlled. 13. The reflective screen according to any one of claims 1 to 3, wherein said horizontal viewing angle increasing layer comprises a sheet substrate in which a row of said raised ridges is formed.

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