JP2009223007A - Reflectve screen and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reflective screen which is improved in contrast. <P>SOLUTION: The reflective screen 1 reflects projection light projected by a projection light source. The reflective screen 1 includes: a light reflective sheet 4 disposed on a back side; a light transmissive layer 5 disposed on an incidence side and having horizontally extending unevenness 9 formed continuously in a horizontal direction; a light shielding layer 6 formed nearly covering projections 10 of the light transmissive layer 5; and a light reflective layer 7 formed nearly covering the light shielding layer 6. Circumference of peak portions of the projections 10 of the light transmissive layer 5 are stuck on the light reflective sheet 4 with the light shielding layer 6 and light reflective layer 7 interposed, and air layers 8 are formed in recesses 11. Bottom portions 11a of the recesses 11 are inclined from a main surface 1a of the screen 1 to the side of the projection light source. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reflective screen, a manufacturing method thereof, and a front projection display system using the reflective screen.

  Conventionally, projectors using liquid crystal and DMD (Digital Micro mirror Device) as video sources have been widely used. In particular, a front projector that projects projection light (image light) on the front surface of a reflective screen (hereinafter sometimes simply referred to as “screen”) has the advantage that the screen can be easily enlarged. Widely used.

  In recent years, front projectors have been used in various projection arrangements. 7 and 8 show an example of the projection arrangement. As shown in FIG. 7, the front projector 2 is often disposed on the desk a, and the entire screen b is higher than the height of the desk a so that the screen b does not become a shadow of the desk a when viewed from the observer. Is also located above. That is, the lower end of the screen b is positioned at the height of the desk a. Therefore, the projection system optical axis K1 of the front projector 2 is at a position biased downward in the center of the screen b in the vertical direction. Furthermore, as shown in FIG. 8, the position of the projection optical axis K1 may be outside the screen b.

  By the way, the front projector has a drawback that when viewed in a bright room, external light is reflected on the screen surface and the contrast of the image is poor.

  An example of a screen for improving this point is disclosed in Patent Document 1. In the screen disclosed in Patent Document 1, a lenticular lens sheet is provided with a reflection layer and a light absorption layer. The contrast is improved by efficiently condensing the projection light on the reflection layer by the lenticular lens.

  Another example of the screen is disclosed in Patent Documents 2 and 3. These screens include a Fresnel-shaped member having an inclined surface as a reflecting surface and a rising surface disposed between the inclined surfaces as an absorbing surface. The contrast is improved by optimizing the reflection directivity of the projection light on the inclined surface and absorbing the outside light on the light absorption surface.

Further, another example of the screen is disclosed in Patent Document 4. The screen disclosed in Patent Document 4 is formed by alternately forming a plurality of first inclined surfaces and second inclined surfaces extending in the vertical direction in the horizontal direction in the horizontal direction, and the first inclined surface as a translucent surface, It is the screen which used the 2nd inclined surface as the light absorption surface. The projection light is transmitted through the first inclined surface and is reflected by the reflective layer on the back side. On the other hand, external light is absorbed by the light absorption surface. Thereby, the contrast is improved.
JP-A-2-072340 JP-A-5-011345 JP-A-1-161228 JP-A-6-282009

  However, in the screen of Patent Document 1, when the external light source is near the front front of the screen, the contrast improvement effect may be insufficient. There is a possibility that external light that has entered the unit lens of the lenticular lens from directly above the front of the screen reaches a reflection layer located under the light absorption layer under the reflection layer facing the lenticular lens. This is because the external light may be reflected on the incident side (observation side).

  Further, in the screens of Patent Documents 2 and 3, there is a problem that if the reflection directivity is enhanced by using the reflection surface as a mirror surface, the image becomes dark when the image is viewed from outside the specific visual field range. On the other hand, if the reflection directivity is weakened by using the reflecting surface as the diffusing surface, the external light is diffusely reflected and the contrast improving effect becomes insufficient.

  In addition, even with the screen of Patent Document 4, the effect of improving contrast may be insufficient. This is because part of the external light incident on the light transmitting surface may be refracted by the light transmitting surface and reach the reflective layer on the back side and reflected on the incident side.

As described above, the improvement in contrast is insufficient even with the above-described technique.
The present invention has been made to solve the above-described problems, and provides a reflective screen with improved contrast, a method for manufacturing the same, and a front projection display system using the reflective screen. For the purpose.

The reflective screen according to the present invention is
A reflective screen for reflecting the projection light emitted from the projection light source,
A light reflecting sheet disposed on the back side;
A light-transmitting layer that is arranged on the incident side, and on the back side, the unevenness extending in the horizontal direction is continuously formed in the vertical direction;
A light shielding layer formed so as to substantially cover the convex portion of the light transmitting layer;
A light reflecting layer formed so as to substantially cover the light shielding layer,
The vicinity of the top of the convex portion of the translucent layer is bonded to the light reflecting sheet via the light shielding layer and the light reflecting layer, and an air layer is formed in the concave portion,
The bottom of the recess is inclined toward the projection light source from the main surface of the screen. Thereby, the projection light is reflected to the incident side, and the outside light can be absorbed, resulting in a good contrast.

  It is preferable that a lenticular lens that condenses the projection light on the bottom of the concave portion is provided on the incident side of the light transmitting layer. Thereby, it is possible to reliably reflect the incident light incident from the lower side of the screen to the incident side, and to effectively shield the external light incident from the upper side of the screen.

  It is preferable that the bottom of the above-mentioned recess is inclined at an angle of (2π / 360) × 5 rad or more (2π / 360) × 45 rad or less from the main surface of the screen to the projection light source side.

The front projection display system according to the present invention is
The reflective screen according to any one of claims 1 to 3,
A projection light source that emits projection light;
It has. Thereby, the projection light is reflected to the incident side, and the outside light can be absorbed, resulting in a good contrast.

A reflective screen manufacturing method according to the present invention includes:
A method of manufacturing a reflective screen that reflects projection light emitted from a projection light source,
On one surface, a step of forming a translucent layer in which the bottom of the recess is inclined from the main surface of the screen to the projection light source side, extending in the horizontal direction and continuous in the vertical direction;
Forming a light shielding layer so as to substantially cover the convex portion of the light transmitting layer;
Forming a light reflecting layer so as to substantially cover the light shielding layer;
Pasting the vicinity of the top of the convex portion of the translucent layer to the light reflecting sheet via the light shielding layer and the light reflecting layer, and forming an air layer in the concave portion;
It has. Thereby, the projection light is reflected to the incident side, and the outside light can be absorbed, resulting in a good contrast. Moreover, since the vicinity of the top part of the convex part of a translucent layer should just be bonded to a light reflection sheet, high precision is not required and manufacture is easy.

  It is preferable to form a lenticular lens that condenses the projection light on the bottom of the concave portion on the incident side of the light transmitting layer. Thereby, it is possible to reliably reflect the incident light incident from the lower side of the screen to the incident side, and to effectively shield the external light incident from the upper side of the screen.

  The black ink is applied by roll printing or screen printing so as to substantially cover the convex portion of the light transmitting layer, and the light shielding layer is formed, and the white ink is applied by roll printing or screen printing so as to substantially cover the light shielding layer. The light reflecting layer is preferably formed. Thereby, a light shielding layer and a light reflection layer can be easily formed.

  ADVANTAGE OF THE INVENTION According to this invention, the reflection type screen which improved the contrast further, its manufacturing method, and the front projection type display system using the said reflection type screen can be provided.

  Embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments. In addition, for clarity of explanation, the following description and drawings are simplified as appropriate.

<Embodiment 1>
FIG. 1 is a schematic side view showing an example of a front projection display system 100 using the reflective screen 1 of the present embodiment. FIG. 1 is a schematic cross-sectional view in which the lower and upper portions of the screen 1 are enlarged. A front projection display device (front projector) 2 having a projection light source (not shown) is installed at substantially the same height as the lower end of the screen 1 as shown in FIG. That is, the optical axis (projection system optical axis) of the projection lens (not shown) that emits the projection light L 0 of the front projection display device 2 is substantially the same height as the lower part of the screen 1. Then, the projection light L0 projected from the front projection display device 2 spreads radially around the projection optical axis of the front projection display device 2 and reaches the screen 1. In other words, most of the screen 1 is positioned higher than the projection optical axis of the front projection display device 2, so that the projection light L 0 enters the screen 1 from below.

  In addition, an indoor illumination 3 (external light source) is installed directly above the screen 1, and external light L <b> 1 emitted from the indoor illumination 3 enters from above the screen 1.

  As shown in FIGS. 1 and 2, the screen 1 includes a light reflecting sheet 4, a light transmitting layer 5, a light shielding layer 6, a light reflecting layer 7, and an air layer 8.

  The light reflecting sheet 4 is disposed on the back side. As the light reflecting sheet 4, a resin film mixed with a diffusing material, a sheet coated with white ink, a sheet subjected to metal vapor deposition, or the like can be used.

  The light transmitting layer 5 is disposed on the incident side. The translucent layer 5 is formed so that the incident side is flat, and on the back side, irregularities 9 extending in the horizontal direction are formed in such a manner that the convex portions 10 and the concave portions 11 are alternately continued in the vertical direction. ing. The unevenness 9 is an asymmetric quadrangular shape. Specifically, the top portion 10a of the convex portion 10 is flat, and the bottom portion 11a of the concave portion 11 is inclined from the main surface 1a of the screen 1 toward the front projection display device 2 (that is, the projection light source). And the lower side surface 10b of the convex part 10 inclines to the indoor lighting 3 side so that the external light from the indoor lighting 3 installed upwards may enter easily. On the other hand, although the details of the upper side surface 10c of the convex portion 10 will be described later, the projection light from the front projection display device 2 is incident on the light reflecting layer 7 formed so as to cover the upper side surface 10c. It is inclined to the light reflecting sheet 4 side so that it can be emitted to the incident side or emitted to the light reflecting sheet 4 side. That is, the convex portion 10 has a shape widened toward the incident side.

  The angle α of the bottom 11a of the recess 11 with respect to the main surface 1a of the screen 1 may be appropriately set depending on the arrangement of the front projection display device 2, the external light source 3 and the screen 1, and the ease of manufacture. 2π / 360) × 5 rad or more (2π / 360) × 45 rad or less. If it is less than (2π / 360) × 5 rad, the effects of the present invention may not be sufficiently obtained. Further, if it is larger than (2π / 360) × 45 rad, it may be difficult to manufacture.

  Depending on the specifications and arrangement of the front projection display device 2, the incident angle θ on the screen 1 is, for example, (2π / 360) × −10 rad (−10 °) to (2π / 360) × 10 rad (10 °). (Near the extension line of the projector optical axis K1 in FIG. 7). Considering that the refractive index of a synthetic resin generally used for the light-transmitting layer 5 is about 1.5 to 1.6, the critical angle is about (2π / 360) × 40 rad (40 °). Therefore, even if the incident light enters the main surface 1a of the screen 1 substantially perpendicularly, the projected light is not totally reflected by the bottom portion 11a of the concave portion 11, but is transmitted and reaches the air layer 8 in the concave portion 11. The angle α of the bottom 11a of the recess 11 is preferably (2π / 360) × 40 rad (40 °) or less, more preferably (2π / 360) × 35 rad (35 °) or less, and (2π / 360) × 30 rad (30 °) The following are particularly preferred: By setting the angle α of the bottom 11a of the concave portion 11 in this way, it is possible to more effectively shield external light incident from above the screen 1, and more incident light incident from below the screen 1 can be blocked. It can be reliably reflected to the incident side.

  Note that the angle α may be larger toward the upper part of the screen, considering that the upper part of the screen is irradiated with the projection light from below the screen 1 and the external light is emitted from the front side.

  Moreover, although it is preferable that the bottom part 11a of the recessed part 11 is smooth, it can give a fine unevenness | corrugation in the range which exhibits the effect of this invention, or can make it a concave surface and a convex surface.

  The light shielding layer 6 is formed so as to substantially cover the convex portion 10 of the light transmitting layer 5. The translucent layer 6 can be formed by applying black ink by roll printing or screen printing using, for example, a roll knife so as to substantially cover the convex portion 10.

  The light reflecting layer 7 is formed so as to substantially cover the light shielding layer 6. The light reflection layer 7 can be formed by applying white ink by roll printing or screen printing, for example, in the same manner as the ink application method, so as to substantially cover the light shielding layer 6.

  The vicinity of the top portion 10 a of the convex portion 10 of the light transmitting layer 5 is bonded to the light reflecting sheet 4 through the light shielding layer 6 and the light reflecting layer 7. As a result, the air layer 8 is formed in the concave portion 11 of the translucent layer 5.

  The projection light L0 and the external light L1 incident on the screen 1 having such a configuration follow a light ray path as shown in FIG.

  The external light L1 from obliquely above the screen 1 is refracted by the main surface (incident surface) of the screen 1, and part of the external light L1 reaches the light shielding layer 6 directly and is absorbed. The other part of the external light L1 reaches the bottom 11a of the recess 11, but the bottom 11a of the recess 11 forming the air layer 8 is inclined toward the projection light source side, so that it is totally reflected at the interface, and then to the light shielding layer 6. Reach and be absorbed. That is, since the bottom 11a of the recess 11 is inclined toward the projection light source, the incident angle of the external light L1 that has reached the bottom 11a of the recess 11 becomes relatively large and becomes greater than the critical angle. Therefore, the external light L1 is totally reflected at the bottom 11a of the recess 11. The totally reflected external light L1 reaches the light shielding layer 6 protruding to the incident side and is absorbed.

  On the other hand, the projection light L0 from obliquely below the screen 1 is refracted by the main surface of the screen 1, and a part of the projection light L0 reaches the bottom 11a of the recess 11, but the bottom 11a of the recess 11 faces the projection light source side. Since it is inclined, unlike the case of the external light L1, it is transmitted without being totally reflected. Thereafter, the light is reflected by the light reflecting layer 7 formed so as to cover the light reflecting sheet 4 and the light shielding layer 6 on the back surface, and is emitted to the incident side. That is, since the bottom 11a of the recess 11 is inclined toward the projection light source, the incident angle of the projection light L0 that has reached the bottom 11a of the recess 11 is relatively small and smaller than the critical angle. Therefore, the projection light L 0 is transmitted through the bottom 11 a of the recess 11 and reflected by the light reflecting sheet 4 and the light reflecting layer 7 in the air layer 8.

  Here, the other part of the projection light L0 is incident on the light shielding layer 6, but if the bottom 11a of the recess 11 is inclined to the projection light source side, the shape of the light shielding layer 6 is asymmetrical as shown in FIG. That is, it is easy to make the lower side surface 10b of the convex portion 10 project to the incident side with respect to the upper side surface 10c), and the ratio of reaching the bottom portion 11a of the concave portion 11 can be increased.

  In addition, when the projection light reflected by the light reflecting layer 7 is emitted to the incident side, the bottom 11a of the recess 11 and the main surface of the screen 1 have an effect similar to a prism, so that the observer is deflected slightly downward. The light is emitted and a brighter image is obtained.

  Accordingly, the screen 1 and the front projection display system 100 using the screen 1 can reflect the projection light to the incident side and can absorb the external light, resulting in good contrast. Further, when a diffusing material is mixed in the light reflecting sheet 4 or the light reflecting layer 7 or the surface has a concavo-convex structure, the projection light is diffusely reflected, so that a bright image can be viewed in a wide range.

The screen 1 described above is manufactured as follows.
First, by extrusion or the like, an asymmetric quadrangular unevenness 9 in which one side is flat and the bottom 11a of the recess 11 is inclined on the opposite surface from the main surface 1a of the screen 1 to the projection light source side extends in the horizontal direction. And the translucent layer 5 made of a styrene resin that is continuous in the vertical direction is formed.

  However, the translucent layer 5 can be formed by a molding method other than extrusion molding. For example, by applying urethane UV curable resin on one side of a transparent film, pressing a mold with a flat and asymmetrical rectangular shape on the bottom, and irradiating with UV light, one side is flat and the opposite side is asymmetric It is possible to form a light-transmitting layer 5 having a square-shaped unevenness 9.

  Next, black ink is applied by roll printing or screen printing using, for example, a roll knife so as to substantially cover the convex portion 10 of the light transmissive layer 5, thereby forming the light shielding layer 6. Therefore, the light shielding layer 6 can be easily formed.

  Next, the light reflecting layer 7 is formed by applying white ink so as to substantially cover the light shielding layer 6. As with the black ink application method, the white ink application method can employ roll printing or screen printing, and the light reflecting layer 7 can be easily formed.

  Thereafter, the vicinity of the top portion 10 a of the convex portion 10 of the translucent layer 5 is bonded to the previously formed light reflecting sheet 4 via the light shielding layer 6 and the light reflecting layer 7, and the air layer 8 is formed in the recessed portion 11. When formed, the screen 1 is completed.

  Since the vicinity of the top portion 10a of the convex portion 10 of the light-transmitting layer 5 only needs to be bonded to the light reflecting sheet 4, high accuracy is not required and the manufacture is simple.

  Incidentally, in the bonding step, a transparent adhesive may be used, or a white diffusible adhesive may be used as an adhesive layer and a light reflecting layer.

<Embodiment 2>
The screen 1 of the first embodiment is formed flat on the incident side, but preferably includes a lenticular lens 12 that condenses the projection light on the bottom 11a of the recess 11 as shown in FIG.

  In the lenticular lens 12, a plurality of unit lenses 13 are continuously formed on the incident side of the translucent layer 5. The unit lens 13 is a columnar convex lens having a cross-sectional shape that is an umbilical shape (that is, a substantially C-shaped convex shape).

  At this time, the unit lens 13 of the lenticular lens 12 is preferably formed at a position corresponding to the bottom 11 a of the recess 11. Note that the position of the unit lens 13 of the lenticular lens 12 may be appropriately shifted from the position corresponding to the bottom 11 a of the recess 11 in accordance with the arrangement of the projection light source, the external light source, and the screen 1. In the present embodiment, considering that the front projection display device 2 is installed at substantially the same height as the lower end of the screen 1 and the projection light L0 is incident on a high portion of the screen 1 from below, in particular, the upper portion of the screen 1 is used. In this case, it is preferable to shift the position of the unit lens 13 downward from the position corresponding to the bottom 11a of the recess 11.

  The amount by which the position of the unit lens 13 is shifted downward from the position corresponding to the bottom 11a of the recess 11 can be about 1% to 10% of the lens pitch per 1 m in the vertical direction. Furthermore, the position of the unit lens 13 can be appropriately shifted in the vertical direction according to the focal position of the unit lens 13, the position of the bottom 11 a and the light shielding layer 6 of the recess 11, and the angle of the bottom 11 a of the recess 11.

  Moreover, it is preferable to design the thickness of the light-transmitting layer 5 constituting the lenticular lens 12 so that the bottom 11a of the recess 11 is positioned in the vicinity of the focal point of the lenticular lens 12 on the bottom 11a side. Specifically, the thickness of the translucent layer 5 is designed so that the bottom 11a of the recess 11 is disposed at a position 0.7 to 1.3 times the focal length from the top position of the unit lens 13, for example. It is preferable to do. By adopting such a configuration, it is possible to more reliably reflect the projection light L0 incident from below the screen 1 to the incident side, and to more effectively shield the external light L1 incident from above the screen 1. it can. At the same time, by appropriately shifting the position of the bottom 11a of the recess 11 from the focal position of the unit lens 13 to the unit lens 13 side, it is possible to view an image in a wider field of view.

  Note that the lenticular lens 12 may be formed so that the cross-sectional shape of the unit lens 13 is asymmetric in the vertical direction. Further, the lenticular lens 12 may be formed so that the cross-sectional shape of the unit lens 13 is a polygonal shape.

  The translucent layer 5 constituting such a lenticular lens 12 can also be formed by extrusion molding or the like.

  However, the light-transmitting layer 5 constituting the lenticular lens 12 can be formed by methods other than extrusion molding as in the first embodiment. In other words, first, apply urethane-based UV curable resin on one side of the transparent film, press the mold with flat and asymmetrical quadrangular irregularities on the bottom, and irradiate with ultraviolet rays, so that one side is flat and opposite A translucent sheet having quadrangular irregularities 9 with asymmetric surfaces is formed. Furthermore, an ultraviolet curable urethane-based resin is applied to the flat surface side of the translucent sheet, a mold having a reverse shape of the lens shape is pressed, and irradiated with ultraviolet rays, whereby the lenticular lens 12 is provided on one side. And the translucent layer 5 which has the asymmetrical square-shaped unevenness | corrugation 9 on the opposite surface can be formed.

<Example 1>
As an example, a screen 1 was produced as follows.
First, as shown in FIG. 4, using a methacrylstyrene copolymer resin (refractive index = 1.57), a cylindrical convex lens (unit lens) having a pitch of 0.15 mm on one surface by an extruder and a roll mold. 13) has a plurality of lenticular lenses 12 arranged side by side, and a light-transmitting layer 5 having asymmetrical irregularities 9 on the opposite surface is formed. Incidentally, the methacrylstyrene copolymer resin was mixed with 4% by weight of a diffusion material composed of a crosslinked methacrylstyrene copolymer resin. The average particle diameter of the diffusing material is 8 μm.

  The concave portions 11 are formed at the same pitch as the lenticular lens 12 at positions corresponding to the unit lenses 13 of the lenticular lens 12. Therefore, moire does not occur due to the lenticular lens 12 and the unevenness 9 formed on the opposite surface. However, in the present example, as shown in FIG. 4, the bottom 11 a of the recess 11 was shifted about 0.01 mm above the lens optical axis of the unit lens 13.

  The concave portions 11 are formed so that the pitch of the bottom portions 11a is 0.15 mm. And when the screen 1 formed using the translucent layer 5 is installed in the wall etc., the bottom part 11a of the recessed part 11 is formed diagonally so that it may incline downward.

  Next, using a printing apparatus, black ink was applied to the top portion 10 a of the convex portion 10 formed on the back side of the translucent layer 5 and substantially the entire surface of the slope. Thereafter, the black ink was cured by irradiating ultraviolet rays, and the light shielding layer 6 was formed. As a result, a light shielding layer 6 having a thickness of about 0.01 mm was formed on the surface of the convex portion 10 of the light transmitting layer 5.

  Thereafter, an acrylic adhesive (refractive index = 1.49) mixed with a white pigment was applied so as to substantially cover the light shielding layer 6 to form the light reflecting layer 7. Next, the top portion 10 a of the convex portion 10 of the translucent layer 5 is bonded to the light reflecting sheet 4 through the light shielding layer 6 and the light reflecting layer 7, and the air layer 8 is formed in the recessed portion 11 to manufacture the screen 1. did. The light reflecting sheet 4 also serves as a usual backing sheet, and the screen 1 can be rolled up. The screen size of the produced screen 1 is 1.7 m long and 2.2 m wide.

<Comparative Example 1>
A conventional screen “WG-225” manufactured by Kuraray Plastics Co., Ltd. was used as a comparative screen.

[Evaluation of Comparative Example]
Visual visual evaluation of the screen 1 of an Example and the screen of a comparative example was performed.
FIG. 5 and FIG. 6 show examples of screen arrangement states in the example and the comparative example. As shown in FIGS. 5 and 6, images were projected on the screen 1 of the example and the screen of the comparative example in a bright room, and the brightness and contrast were evaluated. The front projection display device 2 used here is “MP-450” manufactured by Nippon Avionics Co., Ltd. The front projection display device 2 is arranged at substantially the same height as the lower end of the screen so that the projection optical axis of the front projection display device 2 is the lower end of the screen. The illumination (external light source) is fluorescent lamp illumination. The illuminance at the center of the screen of the illumination was 360 lux when lit.

[Visual evaluation of video]
In order to perform visual image evaluation, lighting was turned on, and a TV image was projected onto the screen 1 of the example and the screen of the comparative example, and was visually evaluated.

  As a result, on the screen 1 of the example, the image was displayed brightly and the contrast of the image was excellent. In addition, in the screen 1 of the example, moire caused by a shift between the pixel pitch and the lens pitch of the lenticular lens 12 was not observed.

  On the other hand, on the screen of the comparative example, the image was displayed white by the external light, and the contrast of the image was relatively poor.

  Thus, according to the present invention, it is possible to realize a screen that is bright and excellent in contrast, and in which moire caused by a shift between the pixel pitch and the lens pitch of the lenticular lens is not noticeable.

It is a side view schematic diagram which shows an example of the front projection type display system using the reflective screen which concerns on this invention. It is a cross-sectional schematic diagram which shows Embodiment 1 of the reflective screen which concerns on this invention. It is a cross-sectional schematic diagram which shows Embodiment 2 of the reflection type screen which concerns on this invention. It is a cross-sectional schematic diagram which shows the translucent layer of an Example. It is a side view schematic diagram which shows an example of the arrangement | positioning state of the reflective screen of an Example and a comparative example. It is a top view schematic diagram which shows an example of the arrangement | positioning state of the reflective screen of an Example and a comparative example. It is a side view schematic diagram which shows the arrangement | positioning state of a reflection type screen and a front projection type display apparatus. It is a side view schematic diagram which shows the different arrangement | positioning state of a reflective screen and a front projection type display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reflective screen 1a Main surface 2 of a reflective screen Front projector (front projection type display apparatus)
3 Indoor lighting (external light source)
4 Light reflecting sheet 5 Light transmitting layer 6 Light blocking layer 7 Light reflecting layer 8 Air layer 9 Convex / concave 10 Convex 10a Convex top 11 Concave 11a Concave bottom 12 Lenticular lens 13 Unit lens 100 Front projection display system L0 Projection light

Claims (7)

A reflective screen for reflecting the projection light emitted from the projection light source,
A light reflecting sheet disposed on the back side;
A light-transmitting layer that is arranged on the incident side, and on the back side, the unevenness extending in the horizontal direction is continuously formed in the vertical direction;
A light shielding layer formed so as to substantially cover the convex portion of the light transmitting layer;
A light reflecting layer formed so as to substantially cover the light shielding layer,
The vicinity of the top of the convex portion of the translucent layer is bonded to the light reflecting sheet via the light shielding layer and the light reflecting layer, and an air layer is formed in the concave portion,
A reflective screen in which the bottom of the recess is inclined from the main surface of the screen toward the projection light source.   The reflective screen according to claim 1, further comprising a lenticular lens that condenses projection light on a bottom portion of the concave portion on an incident side of the translucent layer.   The bottom of the recess is inclined at an angle of (2π / 360) × 5 rad or more (2π / 360) × 45 rad or less from the main surface of the screen to the projection light source side. 2. A reflective screen according to 2. The reflective screen according to any one of claims 1 to 3,
A projection light source that emits projection light;
Front projection type display system. A method of manufacturing a reflective screen that reflects projection light emitted from a projection light source,
On one surface, a step of forming a translucent layer in which the bottom of the recess is inclined from the main surface of the screen to the projection light source side, extending in the horizontal direction and continuous in the vertical direction;
Forming a light shielding layer so as to substantially cover the convex portion of the light transmitting layer;
Forming a light reflecting layer so as to substantially cover the light shielding layer;
Pasting the vicinity of the top of the convex portion of the translucent layer to the light reflecting sheet via the light shielding layer and the light reflecting layer, and forming an air layer in the concave portion;
A method of manufacturing a reflective screen comprising:   6. The method of manufacturing a reflective screen according to claim 5, wherein a lenticular lens for condensing projection light on the bottom of the concave portion is formed on the incident side of the translucent layer.   The black ink is applied by roll printing or screen printing so as to substantially cover the convex portion of the translucent layer to form the light shielding layer, and the white ink is applied by roll printing or screen printing so as to substantially cover the light shielding layer. The method for manufacturing a reflective screen according to claim 5, wherein the light reflecting layer is formed.

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