JP5750355B2 - Transmission screen and rear projection device - Google Patents

Description

  The present invention relates to a transmissive screen and a rear projection apparatus.

A screen is known in which incident video light is totally reflected by a reflecting portion formed on an inclined surface and is emitted to a side opposite to the incident side (see, for example, Patent Document 1).
[Patent Document 1] JP 2006-162830 A

  However, in the above-described screen, the reflection part reflects the image light in approximately one direction. As a result, there is a problem that the viewing angle of the video is small.

  In the first aspect of the present invention, a plurality of prisms having a flat base portion and a pair of surfaces provided on one surface of the base portion, at least one inclined with respect to the one surface and intersecting each other. And a plurality of diffuse reflection layers that are provided on one surface of the pair of surfaces of each prism portion and diffuse light reflected from the other surface of the pair of surfaces and reflect the light to the base portion. A transmissive screen is provided.

  In a second aspect of the present invention, the image processing apparatus includes a video output unit that outputs video light that forms video, and a transmissive screen that transmits the video light, the transmissive screen including a flat base portion, Provided on one surface of the base portion, having at least one inclined surface with respect to the one surface, intersecting each other, and having a pair of surfaces including an incident surface on which the image light is incident and a reflecting surface intersecting the incident surface Provided is a rear projection device that includes a plurality of prism portions and a plurality of diffuse reflection layers that are provided on the reflection surface of each prism portion and diffuse the image light incident from the incident surface and reflect the diffused light to the base portion. .

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

1 is an overall configuration diagram of a rear projection apparatus 10. FIG. 1 is an overall perspective view of a transmissive screen 18. FIG. 3 is an enlarged cross-sectional view of a transmission screen 18. FIG. FIG. 4 is a partially enlarged view of FIG. 3. It is an expanded sectional view of transmission type screen 118 by another embodiment. It is an expanded sectional view of the transmission type screen 218 by another embodiment. FIG. 7 is a partially enlarged view of FIG. 6. It is an expanded sectional view of the transmission type screen 318 by another embodiment. It is the schematic explaining the specific example of arrangement | positioning of the projection apparatus 410. FIG. FIG. 10 is a partially enlarged view of the transmission screen 418 shown in FIG. 9. FIG. 10 is a partially enlarged view of the transmission screen 418 shown in FIG. 9. FIG. 10 is a partially enlarged view of the transmission screen 418 shown in FIG. 9. It is the schematic explaining the other specific example of arrangement | positioning of the projection apparatus 510. FIG. FIG. 14 is a partially enlarged view of the transmission screen 518 shown in FIG. 13. FIG. 14 is a partially enlarged view of the transmission screen 518 shown in FIG. 13. FIG. 14 is a partially enlarged view of the transmission screen 518 shown in FIG. 13.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 is an overall configuration diagram of the rear projection apparatus 10. As shown in FIG. 1, the rear projection apparatus 10 includes a video output unit 14, a reflection mirror 16, and a transmissive screen 18. The video output unit 14 outputs video light PL that forms a video to the reflection mirror 16. The reflection mirror 16 reflects the video light PL output from the video output unit 14 to the transmissive screen 18. The transmission screen 18 transmits and reflects the image light PL reflected by the reflection mirror 16 and projects it forward.

  FIG. 2 is an overall perspective view of the transmissive screen 18. FIG. 3 is an enlarged cross-sectional view of the transmission screen 18. FIG. 4 is a partially enlarged view of FIG. As shown in FIGS. 2, 3, and 4, the transmissive screen 18 includes a base portion 22, a plurality of prism portions 24, and a plurality of diffuse reflection layers 26.

  The base portion 22 is formed in a rectangular flat plate shape when viewed from the front. The base portion 22 is made of a material that can transmit light. The base portion 22 is made of a flexible material that can be wound. Examples of the material constituting the base portion 22 are acrylic resin, epoxy resin, polycarbonate resin, polyester resin, styrene resin, acrylic styrene copolymer resin, silicone resin, and urethane resin.

  The plurality of prism portions 24 are formed on the rear surface of the base portion 22. The plurality of prism portions 24 are integrated with the base portion 22. The prism portion 24 is made of the same material as the base portion 22. The prism portion 24 is formed in a triangular prism shape extending linearly along the horizontal direction. The length of the prism portion 24 in the horizontal direction is equal to the length of the base portion 22 in the horizontal direction. Therefore, the prism portion 24 is provided over the entire length of the base portion 22 in the horizontal direction. Each prism part 24 is arrange | positioned mutually parallel. The plurality of prism portions 24 are periodically arranged along the vertical direction. An example of the pitch of the prism portions 24 is 100 μm to 300 μm. An example of the height in the front-rear direction of the prism portion 24 is 70 μm to 200 μm.

  The prism unit 24 has an incident surface 30 and a reflecting surface 32. The incident surface 30 and the reflecting surface 32 are an example of a pair of surfaces. The reflecting surface 32 is an example of one surface of the pair of surfaces, and the incident surface 30 is an example of the other surface of the pair of surfaces.

  The incident surface 30 is formed in a rectangular planar shape. The incident surface 30 is disposed upstream of the reflecting surface 32 in the traveling direction of the image light PL. The incident surface 30 is inclined from the normal direction of the base portion 22. The normal direction of the incident surface 30 is preferably slightly shifted from the traveling direction of the image light PL. Thereby, it is possible to suppress the image light PL reflected by the incident surface 30 from being irradiated to the image output unit 14 while suppressing the reflection of the image light PL by the incident surface 30.

  The reflection surface 32 is formed in a rectangular planar shape. The reflecting surface 32 is disposed below the incident surface 30. The reflecting surface 32 is disposed downstream of the incident surface 30 in the traveling direction of the image light PL. The reflecting surface 32 intersects the incident surface 30. The reflective surface 32 is inclined from the normal direction of the base portion 22. The inclination direction of the reflection surface 32 is preferably set to an angle at which the diffuse reflection layer 26 can totally reflect the image light PL. In this case, the inclination direction of the reflecting surface 32 is set corresponding to the incident angle of the image light PL.

An example of the angle θ _α between the incident surface 30 of the prism portion 24 and the vertical plane parallel to the exit surface 23 of the base portion 22 is 51 °. An example of the angle θ _β between the reflecting surface 32 of the prism portion 24 and the vertical surface parallel to the emission surface 23 of the base portion 22 is 75 °. In addition, it is preferable that the angles θ _α and θ _β of the prism portions 24 are all equal from the viewpoint of simplifying the manufacturing process. On the other hand, the angles θ _α and θ _β of the prism portions 24 are preferably different from the viewpoint of improving the image quality. When the angles θ _α and θ _β are made different from each other, it is preferable that the incident angle of the image light PL incident on each prism section 24 is made to correspond to the angles θ _α and θ _β and gradually changed.

  The diffuse reflection layer 26 is provided on the reflection surface 32 of each prism portion 24. The diffuse reflection layer 26 is made of a reflective paint containing silica, mica, titanium oxide, and barium carbonate. The diffuse reflection performance of the diffuse reflection layer 26 can be improved by making the refractive index of the binder resin of the reflective paint substantially the same as the refractive index of the resin of the prism portion 24. The diffuse reflection layer 26 diffuses the incident video light PL incident from the incident surface 30 and reflects the diffused image light PL to the base portion 22. An example of the thickness of the diffuse reflection layer 26 is 10 μm to 20 μm. By increasing the thickness of the diffuse reflection layer 26, the concealability can be improved and the gain can be improved. The diffuse reflection layer 26 is formed over the entire length of the reflection surface 32 in the horizontal direction. The diffuse reflection layer 26 is provided from the top 50 between the incident surface 30 and the reflection surface 32 to the middle of the reflection surface 32. The top portion 50 is a portion where the incident surface 30 and the reflecting surface 32 intersect each other in each prism portion 24. An example of the intermediate portion is an intersection 52 where a straight line passing through the apex 50 of the prism portion 24 and parallel to the traveling direction of the image light PL intersects the reflecting surface 32. From the viewpoint of suppressing reflection of external light output from external illumination or the like, the diffuse reflection layer 26 may be reduced closer to the top portion 50 than the intersecting portion 52.

  Next, the operation of the transmissive screen 18 will be described. The image light PL is reflected by the reflection mirror 16 and reaches the transmissive screen 18. An example of the traveling direction of the image light PL reflected by the reflecting mirror 16 is a direction inclined backward by 15 ° from the vertical direction. The image light PL that has reached the transmissive screen 18 is incident from the incident surface 30 of the prism portion 24. The image light PL passes through the prism portion 24 and reaches the reflection surface 32. The image light PL is diffused and reflected by the diffuse reflection layer 26 provided on the reflection surface 32. Thereafter, the image light PL travels through the prism portion 24 and the base portion 22 and is emitted forward from the output side surface of the base portion 22. As a result, the user can view the video.

  As described above, the transmissive screen 18 includes the diffuse reflection layer 26 that diffuses and reflects the video light PL. Thereby, since the transmission screen 18 can widen the emission direction of the image light PL, the viewing angle can be widened. Further, since the transmissive screen 18 spreads the image light PL by the diffuse reflection layer 26, a lenticular lens for diffusion can be omitted. As a result, the transmissive screen 18 is lighter and thinner than the transmissive screen composed of a Fresnel lens and a lenticular lens, and the positioning of both lenses can be omitted, thus simplifying the manufacturing process. Can be Furthermore, since the transmissive screen 18 does not use both lenses, floating and relative distortion caused by both lenses do not occur, and it is difficult to be affected by temperature and humidity. Thereby, the transmission type screen 18 can suppress the fall of an image.

  FIG. 5 is an enlarged cross-sectional view of a transmission screen 118 according to another embodiment. As shown in FIG. 5, the transmissive screen 118 further includes a reflection-side light absorption layer 34.

  The reflection side light absorption layer 34 is formed over the entire length of the reflection surface 32 in the horizontal direction. The reflection side light absorption layer 34 covers the entire reflection surface 32. A part of the reflection side light absorption layer 34 covers the reflection surface 32 via the diffuse reflection layer 26. In addition, although the reflection side light absorption layer 34 may be formed in a part of each reflective surface 32, it is preferable to cover at least the area | region in which the diffuse reflection layer 26 is not formed. An example of the material constituting the reflection side light absorption layer 34 is urethane containing carbon black. By making the refractive index of the binder resin of the light-absorbing paint substantially the same as the refractive index constituting the resin of the prism portion 24, the light absorption of the reflection side light absorption layer 34 can be improved.

  In the transmissive screen 118, for example, the external light OL that has entered from the emission-side surface of the base portion 22 and stray light due to internal reflection are absorbed by the reflection-side light absorption layer 34. An example of the incident angle of the external light OL is less than 20 ° forward from the vertical direction. Thereby, it can suppress that external light OL and stray light are absorbed by the reflection side light absorption layer 34, and are radiate | emitted from the output side. As a result, the transmissive screen 118 can improve contrast.

  FIG. 6 is an enlarged cross-sectional view of a transmission screen 218 according to another embodiment. FIG. 7 is a partially enlarged view of FIG. As shown in FIGS. 6 and 7, the transmissive screen 218 further includes an incident side light absorption layer 36. An example of the material constituting the incident side light absorption layer 36 is urethane containing carbon black. By making the refractive index of the binder resin of the light-absorbing paint substantially the same as the refractive index constituting the resin of the prism portion 24, the light absorption of the incident side light absorption layer 36 can be improved.

  The incident side light absorption layer 36 is formed over the entire length of the incident surface 30 in the horizontal direction. The incident side light absorption layer 36 is formed in a partial region on the base portion 22 side of the incident surface 30. For example, the incident side light absorption layer 36 is formed from the bottom part to the middle part in the top part direction. The bottom portion is a portion where the front end portion of the incident surface 30 and the front end portion of the reflecting surface 32 of the adjacent prism portion 24 intersect each other. An exposed region exposed from the incident side light absorption layer 36 is formed from the top 50 to the middle of the incident surface 30. An example of the intermediate portion here is a crossing portion 54 between a straight line passing through the apex 50 of the prism portion 24 and parallel to the incident direction, and the incident surface 30. As a result, the exposed area becomes substantially equal to the incident area of the image light PL. The formation region of the exposure region may be changed as appropriate, and it may be configured so that at least part of the image light reaches the reflection surface 32.

  In the transmissive screen 218, for example, after the external light OL that has entered from the exit-side surface of the base portion 22 is reflected by the diffuse reflection layer 26, the external light OL that has reached the entrance surface 30 is incident on the incident-side light absorption layer 36. Can be absorbed. As a result, the transmissive screen 218 can improve contrast.

  Furthermore, the incident side light absorption layer 36 is not formed in the incident region of the image light PL. Thereby, it can suppress that the incident side light absorption layer 36 absorbs image light PL. As a result, gain reduction can be suppressed.

  FIG. 8 is an enlarged cross-sectional view of a transmission screen 318 according to another embodiment. As shown in FIG. 8, the transmission screen 318 further includes a color compensation layer 40 and an antireflection layer 42.

  The color compensation layer 40 is provided on the emission side surface of the base portion 22. The color compensation layer 40 includes a tinting agent or the like and absorbs external light to compensate for a specific color. Thereby, the color compensation layer 40 enhances contrast. The color compensation layer 40 also functions as an adhesive that bonds the antireflection layer 42 and the base portion 22 together.

  The antireflection layer 42 is provided on the surface on the emission side of the base portion 22 via the color compensation layer 40. The antireflection layer 42 of the base portion 22 prevents reflection of external light. In place of the antireflection layer 42, an antiglare layer that prevents glare, a hard coat layer that suppresses scratches on the surface, and the like may be provided.

  Next, a specific example regarding the internal configuration of the projection apparatus and the arrangement of the illumination apparatus and the like will be described. FIG. 9 is a schematic diagram for explaining a specific example of the arrangement of the projection apparatus 410. In the projection apparatus 410 shown in FIG. 9, the video output unit 14 is disposed behind and below the transmissive screen 418. The refractive index of the base part 22 and the prism part 24 is set to 1.6. The transmission screen 418 is a 100 inch type having a height H of 1250 mm. Two illumination devices 60 and 62 are installed in front of and above the projection device 410.

  A vertical distance D1 between the video output unit 14 and the transmission screen 418 is 363 mm. The horizontal distance D2 between the video output unit 14 and the transmissive screen 418 is 432 mm. An angle θ1 between a line connecting the video output unit 14 and the center of the transmission screen 418 and the vertical direction is 24 °. An angle θ2 between a line connecting the video output unit 14 and the upper end of the transmission screen 418 and the vertical direction is 15 °. An angle θ3 between the line connecting the video output unit 14 and the lower end of the transmission screen 418 and the vertical direction is 50 °.

  A vertical distance D3 between the illumination devices 60 and 62 and the center of the transmission screen 418 is 1500 mm. A horizontal distance D4 between the illumination device 60 and the transmission screen 418 is 866 mm. A horizontal distance D5 between the illumination device 62 and the transmission screen 418 is 1500 mm. An angle θ4 between a line connecting the lighting device 60 and the center of the transmission screen 418 and the vertical direction is 30 °. An angle θ5 between a line connecting the lighting device 62 and the center of the transmission screen 418 and the vertical direction is 45 °.

  10, 11 and 12 are partially enlarged views of the transmission screen 418 shown in FIG. In the transmissive screen 418 shown in FIG. 10, the angle θ7 between the incident surface 30 and the vertical surface is 80 °. The angle θ8 between the reflecting surface 32 and the vertical surface is 60 °. The apex angle between the incident surface 30 and the reflecting surface 32 is 40 °. The video light PL output from the video output unit 14 enters the transmission screen 418 at an angle of 15 ° to 50 ° with the vertical direction. The incident video light PL is reflected while being diffused by the diffuse reflection layer 26, and then is output from the exit surface 23 with a certain spread and travels forward. For example, the image light PL incident on the transmission screen 418 at an angle of 24 ° with respect to the vertical direction is reflected while being diffused by the diffuse reflection layer 26. The diffused image light PL is output from the emission surface 23 and travels forward in a state of having a certain spread centering on a direction inclined downward by 18 °.

  As shown in FIG. 11, the external light OL <b> 1 output from the illumination device 60 is incident on the transmission screen 418 at an angle of about 30 ° with respect to the emission surface 23. A part of the external light OL1 is absorbed by the incident side light absorption layer. The remaining external light OL1 is diffused and reflected by the incident surface 30 and the diffuse reflection layer 26, and then most of the external light OL1 that is diffused and travels with a certain spread is mostly reflected side light absorbing layer 34 or incident side. It reaches the light absorption layer 36 and is absorbed.

  As shown in FIG. 12, the external light OL <b> 2 output from the illumination device 60 is incident on the transmission screen 418 at an angle of about 45 ° with respect to the emission surface 23. A part of the external light OL2 is absorbed by the incident side light absorption layer. The remaining external light OL2 is diffused and reflected by the incident surface 30 and the diffuse reflection layer 26, and then most of the external light OL2 that is diffused and travels with a certain spread is mostly reflected side light absorbing layer 34 or incident side. It reaches the light absorption layer 36 and is absorbed.

  FIG. 13 is a schematic diagram for explaining another specific example of the arrangement of the projection apparatus 510. In FIG. 13, the same reference numerals are assigned to the same configurations, angles, and distances as in FIG. In the projection apparatus 510 shown in FIG. 13, the video output unit 14 is disposed behind and above the transmissive screen 518.

  14, FIG. 15 and FIG. 16 are partially enlarged views of the transmission screen 518 shown in FIG. In the transmissive screen 518 shown in FIG. 14, for example, the video light PL that is incident on the transmissive screen 518 at an angle of 24 ° with respect to the vertical direction is reflected while being diffused by the diffuse reflection layer 26. The diffused image light PL is output from the emission surface 23 and travels forward in a state of having a certain spread centering on a direction inclined upward by 18 °.

  As shown in FIG. 15, the external light OL <b> 1 output from the illumination device 60 is incident on the transmission screen 518 at an angle of about 30 ° with respect to the emission surface 23. The external light OL1 reaches the reflection side light absorption layer 34 or the incident side light absorption layer 36 and is absorbed.

  As shown in FIG. 16, the external light OL <b> 2 output from the illumination device 60 is incident on the transmission screen 518 at an angle of about 45 ° with respect to the emission surface 23. The external light OL2 reaches the reflection side light absorption layer 34 or the incident side light absorption layer 36 and is absorbed.

  The shape, arrangement, number, material, and the like of each component in the above-described embodiment may be changed as appropriate. For example, the apex angle or the like of the prism portion 24 may be changed as appropriate.

  In the above-described embodiment, the transmissive screen that can be wound up has been described as an example. However, a plastic plate, a glass plate, and the like are provided on the outgoing side surface of the base portion to reinforce, thereby forming a panel type that cannot be rolled up. Also good.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The order of execution of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior to”. It should be noted that the output can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.

DESCRIPTION OF SYMBOLS 10 Rear projection apparatus 14 Image | video output part 16 Reflection mirror 18 Transmission type screen 22 Base part 23 Output surface 24 Prism part 26 Diffuse reflection layer 30 Incident surface 32 Reflective surface 34 Reflection side light absorption layer 36 Incident side light absorption layer 40 Color compensation layer 42 Antireflection Layer 50 Top 52 Crossing 54 Crossing 60 Lighting Device 62 Lighting Device 118 Transmission Screen 218 Transmission Screen 318 Transmission Screen 410 Projection Device 418 Transmission Screen 510 Projection Device 518 Transmission Screen

Claims (4)

A flat base portion;
A plurality of prism portions provided on one surface of the base portion and having a pair of surfaces at least one inclined from the normal direction of the one surface and intersecting each other;
A plurality of diffuse reflection layers provided on one surface of the pair of surfaces of each prism portion, diffusing light incident from the other surface of the pair of surfaces and reflecting the light to the base portion ;
A transmission type screen comprising: a light absorbing layer that is partially provided on the one surface of the prism portion via the plurality of diffuse reflection layers and absorbs light . The light-absorbing layer, of the one surface of the prism portion, the transmissive screen according to claim 1, further having a portion diffuse reflection layer is formed in a region not provided. The light-absorbing layer, of the other surface of the prism portion, the transmissive screen according to claim 1 or 2 further comprising at least a portion formed in the region of the base portion. An image output unit for outputting image light forming an image;
A transmissive screen that transmits the image light,
The transmission screen is
A flat base portion;
A plurality of surfaces having a pair of surfaces provided on one surface of the base portion, including at least one inclined surface with respect to the one surface, intersecting each other, and an incident surface on which the image light is incident and a reflecting surface intersecting the incident surface The prism part of
A plurality of diffuse reflection layers provided on the reflection surface of each prism portion and diffusing the image light incident from the incident surface and reflecting the diffused image light to the base portion;
A rear projection apparatus, comprising: a light absorption layer that is partially provided on the reflection surface of the prism portion via the plurality of diffuse reflection layers and absorbs light .

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