JP6819398B2 - Transmissive decorative screen and transmissive projection system - Google Patents

Description

The present invention relates to a transmissive decorative screen that is decorated and provides while transmitting light from a light source, and a transmissive projection system including the transmissive decorative screen.

In the process of transmitting the projected light from a light source such as a projector or a light emitting source, the transmissive screen displays the projected image so that the observer can see it, or functions as an illumination that illuminates the surroundings with planar light. To do. Then, in the transmissive screen, layers having various functions for improving the quality of the light reaching the observer side are laminated. For example, in a transmissive screen that displays an image from a projector, it is common to provide a smoke-colored transparent colored layer in order to absorb external light and improve the contrast of the image.

However, with such a transmissive screen, the appearance becomes translucent black when no light is projected from the light source, and when considering harmony with the surroundings, a layer decorated with a pattern or the like is placed on the surface. A transmissive decorative screen having a function has been desired.

For example, Patent Document 1 discloses a technique in which a portion that transmits light and a portion that has a concealing property are mixed, and an image (picture layer) such as an advertisement is arranged in the portion that has the concealing property. According to this, when the image is not projected, the image related to the decorated part such as an advertisement can be shown, and when the image is projected, the image light from the image source can be displayed. And it is possible to make a screen with high design in consideration of harmony with the surroundings.

Japanese Unexamined Patent Publication No. 2005-37818

In recent years, as a light source for projecting light such as image light on a screen, a short focus type light projection device (short focus type projector or the like) that realizes a large screen display by projection from a close distance has been widely used. Such a short-focus type light projection device can project light such as image light onto the transmissive decorative screen from above and below or from the center at an incident angle larger than that of a conventional light source. Therefore, the light projection device can be installed close to the screen, which contributes to space saving of the projection system using the screen.

However, in the short focus type light source, since the distance between the light source and the transmissive decorative screen is short, the angle of the light incident on the transmissive decorative screen becomes large with respect to the screen surface normal direction. At this time, since the angle increases as the distance from the light source increases, the amount of light transmitted varies greatly depending on the part of the screen, and the uneven brightness becomes remarkable.

When the incident angle of light becomes large in this way, for example, in a transmissive decorative screen as in Patent Document 1, not only the brightness unevenness is generated on the screen, but also the decorated design part is unexpectedly visually recognized depending on the part. There is a problem that it ends up.

Therefore, in view of the above problems, the present invention is a transmission type capable of providing the observed light with high quality by reducing the influence of the decorative portion even when a short focus type light source is used. The subject is to provide a decorative screen. Further, a transmissive projection system using such a transmissive decorative screen is provided.

Hereinafter, the present invention will be described. Reference numerals of the accompanying drawings are added in parentheses to facilitate understanding of the present invention, but the present invention is not limited to the illustrated form.

One aspect of the present invention is a transmissive decorative screen (10, 110) that transmits the light projected from the light source (2) to the observer side, and the pattern layer (18) and the direction of the incident light. A direction changing sheet (11, 111) for changing the light to be closer to the screen normal direction, a light diffusing layer (15) for scattering and transmitting light arranged between the pattern layer and the direction changing sheet, and In the pattern layer, a plurality of light transmitting portions (20), which are holes or slits penetrating in the thickness direction, are arranged in the layer surface direction, and the direction changing sheet projects to the side opposite to the pattern layer side. A plurality of unit optical elements (14, 114) are arranged, and the unit optical elements have an incident surface (14a, 114a) that causes light to enter the unit optical element and a pattern layer that reflects light incident from the incident surface. A transmissive decorative screen (10, 110) comprising a side-facing reflective surface (14b, 114b).

In the transmissive decorative screens (10, 110), a light shielding layer (16) that absorbs light is provided between the light diffusing layer (15) and the pattern layer (18), and the light transmitting portion (20) is provided. The light shielding layer may also penetrate.

Another aspect of the present invention is a transmissive projection system (1, 101) comprising a light source (2) and the transmissive decorative screens (10, 110) described above.

The transmissive projection system (1, 101) can be configured such that the distance between the light emitting surface of the light source (2) and the surface of the transmissive decorative screen (10, 110) is within 1 m.

According to the present invention, even if a short focus type light source is used or light is projected when the light emitting source is arranged at a position close to the screen, the influence of the decorated portion is affected regardless of the position of the screen surface. It can suppress and provide high quality light.

It is a figure explaining one form, and is the perspective view of the transmission type projection system 1. It is sectional drawing of the transmission type projection system 1. 3A and 3B are diagrams for explaining an example of the shape and pattern of the light transmitting portion 20. 4 (a) and 4 (b) are views for explaining an example of the shape and pattern of the light transmitting portion 20. It is sectional drawing of the transmission type projection system 101.

Hereinafter, the present invention will be described based on a mode example with reference to the drawings shown as appropriate. However, the present invention is not limited to these forms.
The shape of each configuration provided in the transmissive decorative screen described below may actually be very minute or thin sheet-like. Therefore, in each of the figures shown below, each shape is exaggerated and deformed for easy viewing. In addition, the reference numerals to be repeated in the drawings may be attached to only a part thereof and the others may be omitted.

FIG. 1 is a perspective view of a transmission type projection system 1 for explaining one embodiment. FIG. 1 also shows the orientation in the posture in which the transmission type projection system 1 is used. FIG. 2 shows a cross-sectional view in the thickness direction of the transmissive decorative screen 10 provided in the transmissive projection system 1 along the vertical direction.

As can be seen from FIGS. 1 and 2, the transmissive projection system 1 includes a video source 2 and a transmissive decorative screen 10. Each will be described below.

The image source 2 is a device that functions as an aspect of a light source and projects image light toward a transmissive decorative screen 10 as a light source accompanied by image information, and is a so-called short focus type image source. As can be seen from FIGS. 1 and 2, in the present embodiment, the image source 2 projects the image light toward the transmissive decorative screen 10 from below the center of the screen of the transmissive decorative screen 10. That is, the image light emitting surface (outermost lens surface) of the image source 2 shown in FIGS. 1 and 2 and the surface of the transmissive decorative screen 10 (the point closest to the image source 2 in the thickness direction). The distance can be shortened. In the short focus type video source 2, specifically, the size of B is 1 m or less, and may be 0.5 m or less. According to the transmissive projection system 1 using the short focus type image source 2, the distance between the image source and the transmissive decorative screen can be made very short, so that it is not necessary to take a large installation space and space is saved. Can be converted. For example, in a conference room, the equipment is less likely to get in the way. Further, when it is installed as a display device in a vehicle such as an automobile or a train, the convenience of space saving is more remarkable considering that it is necessary to arrange many devices in a originally limited space.
Here, the "short focus" varies depending on the size of the projected image, but for example, when an 80-inch size image is projected, the value of B is 1 m or less, preferably 0.65 m or less. As another example, in the case of 8 inches (aspect ratio, 9:16) such as a car navigation display device, the length x width of the screen is 100 mm x 177 mm, and when an image is projected on this, the value of B is It is 0.1 m or less, preferably 0.065 m or less. On the other hand, if the lower limit of the value of B is shorter than this, it can be classified as a short focus, but the value of B is at least larger than 0 m.

Further, in this embodiment, an example in which a video source (projector) is applied as a light source will be described, but other forms can also be applied as a light source.
For example, a single-color light source (single-color light source) for a transparent film on which a fixed image is printed with high transparency (such as an OHP sheet) or for which a light-shielding part is provided to display light and dark (masking). ) May be used to illuminate and transmit the transmitted light, and the transmitted light may be projected toward the transmissive decorative screen 10. At this time, if the color of the monochromatic light source is changed, an image of a different color can be displayed.
Further, the light source may be a light source that does not include video or image information and plays a role of illumination or lighting display. For example, a light source of a lighting device, a light source of an evacuation route light, a lamp of a fire alarm, and a light source of a warning light can be mentioned.

The transmissive decorative screen 10 is in the form of a thin sheet as a whole formed by laminating a plurality of layers. In this embodiment, the sheet surface is installed so as to stand in a vertical direction or a posture close to it in a deployed state at least during use. Will be done. Further, the transmissive decorative screen may be configured to have flexibility so that it can be rolled into a compact shape when not in use.
In this embodiment, an example will be described in which the screen surface is used so as to be substantially vertical, but the present invention is not limited to this. For example, the screen surface may be installed in a nearly horizontal position, such as the operation screen of an automated teller machine (ATM). The present invention can be applied even in such a case.

Then, the transmissive decorative screen 10 transmits the image light projected from the image source 2 to the observer A (see FIGS. 1 and 2) and emits it in the unfolded posture regardless of whether or not it can be wound. By doing so, it functions as a screen.
Further, the transmissive decorative screen 10 can visually recognize the design drawn on the pattern layer 18 when the image light is not projected from the image source 2, and is a screen with high design.

The transmissive decorative screen 10 of this embodiment has a direction changing sheet 11, a light diffusing layer 15, a light shielding layer 16, a colored pattern shielding layer 17, a pattern layer 18, and a transparent protective layer 19 from the image source 2 side. It is composed of. Further, the transmissive decorative screen 10 is formed with at least a plurality of light transmitting portions 20 penetrating the light shielding layer 16, the colored pattern shielding layer 17, and the pattern layer 18 in the thickness direction. Each will be described below.

The direction change sheet 11 changes the direction of the light obliquely projected from the image source 2 arranged on the back side (the side opposite to the observer side), and changes the direction of the light to the normal direction of the transmissive decorative screen 10. It has a function to change the direction so that it approaches (thickness direction). Therefore, as is well shown in FIG. 2, the direction changing sheet 11 includes a base portion 12 and an optical element portion 13, and the optical element portion 13 includes a plurality of unit optical elements 14.

The base portion 12 is a portion that serves as a base material for forming the optical element portion 13, and supports the optical element portion 13 so as to prevent deformation. From this point of view, specific examples of the material constituting the base 12 include transparent resins such as acrylic resin, styrene resin, polyester resin, polycarbonate resin, and acrylic-styrene copolymer resin.

The optical element unit 13 is a portion having a plurality of unit optical elements 14. In the present embodiment, each unit optical element 14 has a portion having a substantially triangular cross section, and the ridge line thereof is arranged so as to project on the side opposite to the pattern layer 18 (observer side). The planes forming the hypotenuse of each unit optical element 14 are the incident surface 14a and the reflecting surface 14b.
The incident surface 14a is a surface that refracts the light from the image source 2 and causes it to enter the unit optical element 14, and is a surface on the side facing the image source 2.
On the other hand, the reflecting surface 14b is a surface that reflects the light incident from the incident surface 14a and turns to the observer side, and is a surface opposite to the image source 2 side.
Such an optical element portion may have a form that acts as described above, and is not particularly limited, but includes, for example, a Fresnel lens layer and a prism lens layer.

Further, as can be seen from FIG. 1, in this embodiment, each unit optical element 14 has a so-called linear shape in which the ridgeline thereof extends in the horizontal direction and the plurality of unit optical elements 14 are arranged in the vertical direction. As a result, the direction change sheet 11 with high productivity can be obtained.
However, in addition to such a form, a so-called circular shape may be obtained in which the ridgeline of each unit optical element extends in an arc shape and is arranged concentrically around a point where a plurality of unit optical elements are present.

Various materials can be used as the material forming the optical element portion 13. However, it is preferable to use a material that is widely used as a material for a sheet incorporated in a screen, has excellent mechanical properties, optical properties, stability, processability, and the like, and is inexpensively available. Examples thereof include transparent resins containing one or more of acrylic, styrene, polycarbonate, polyethylene terephthalate, acrylonitrile and the like as main components, and epoxy acrylate and urethane acrylate-based reactive resins (ionizing and radiation curable resins and the like).

The direction change sheet 11 has a function of changing the direction of the incident light and bringing the traveling direction of the light closer to the normal direction of the screen. Since light is projected from the image source 2 arranged on the back surface side of the direction changing sheet 11 from an oblique direction, the light is incident on each unit optical element 14 at a different angle. Therefore, each unit optical element 14 provided in the direction changing sheet 11 may have the same shape or may be different. That is, it can be configured so that the shape differs depending on the position where it is arranged. Specifically, the pitch of the unit optical element, the protruding height (size in the thickness direction) of the unit optical element, the inclination angle of the incident surface 14a and the reflecting surface 14b, and the like can be specified for each unit optical element.

Such a direction changing sheet 11 can be manufactured by extrusion molding, or by molding or pasting the optical element portion 13 on the base portion 12. In the direction changing sheet 11 manufactured by extrusion molding, the base portion 12 and the optical element portion 13 can be integrally formed. Further, when the direction changing sheet 11 is manufactured by molding or pasting, the material forming the base portion 12 and the material forming the optical element portion 13 may be different or the same.

Such a direction changing sheet 11 may be laminated on the light diffusion layer 15 with an adhesive as in the present embodiment, but may be arranged with a gap between the light diffusion layer 15 and the light diffusion layer 15.
When the direction changing sheet 11 is laminated and integrated with another layer (light diffusion layer 15 in this embodiment) as in this embodiment, the air interface disappears, interfacial reflection can be prevented, and the light utilization efficiency can be improved. ..
On the other hand, if the direction changing sheet 11 is separated from the other layers and a gap is provided, the occurrence of optical distortion can be suppressed and the transparency can be improved because there is no layer due to the adhesive or the adhesive. ..

The light diffusion layer 15 is a layer that scatters the image light from the image source 2 toward the observer side so that the observer can visually recognize the image. Specific means for scattering light are known, and examples thereof include a form in which light diffusing particles are dispersed in a transparent resin.

The transparent resin that disperses the light diffusing particles is not particularly limited as long as it has light transmittance and can retain the light diffusing particles. This includes, for example, polyester resin, acrylic resin, polyester acrylate resin, polyurethane acrylate resin, urethane resin, epoxy resin, polycarbonate resin, acetal resin, vinyl resin, polyethylene resin, polystyrene resin, etc. Examples thereof include thermoplastic resins such as polypropylene-based resins, polyamide-based resins, polyimide-based resins, melamine-based resins, phenol-based resins, silicone-based resins, and fluorine-based resins, thermosetting resins, and ionizing radiation-curable resins.

Examples of the light diffusing particles include inorganic particles such as silica, alumina, talc, zirconia, zinc oxide, and titanium dioxide, and organic particles of polymethylmethacrylate, polystyrene, polyurethane, benzoguanamine, and silicone resin.

The average particle size of the light diffusing particles is preferably 6 μm or more and 10 μm or less, and more preferably 8 μm or more. Sufficient light diffusivity can be obtained by setting the average particle size to 6 μm or more. If the average particle size is made larger than 10 μm, the whitening of the layer due to the aggregation of the particles becomes remarkable, and the image may be blurred.
The average particle size of the particles can be obtained, for example, from a cross-sectional image of the light diffusion layer 15 by a cross-sectional electron microscope (transmission electron microscope such as TEM or STEM) using image processing software. Further, the average particle size of the particles may be obtained by manually calculating the average value using the image of the cross-section electron microscope in consideration of the scale. Further, when the particles are present alone, the average particle size of the particles can be measured by a laser scattering method at a stage before the light diffusing particles are dispersed in the transparent resin.
When a fine particle light diffusing material such as titanium oxide is used, the average particle size thereof is 10 nm or more and 1000 nm or less, preferably 300 nm or more and 700 nm or less.

The thickness of the light diffusion layer 15 is preferably 1 μm or more and 50 μm or less, more preferably 14 μm or more and 20 μm or less, and further preferably 16 μm or more and 18 μm or less. If the thickness of the light diffusion layer 15 is less than 1 μm, the light diffusion effect may not be sufficiently obtained. If the thickness of the light diffusion layer 15 exceeds 50 μm, the resolution of the displayed image deteriorates, and the image may be blurred and observed.

The light shielding layer 16 is a layer configured to absorb light. This makes it possible to improve the contrast of the image light. The specific structure of the layer that absorbs light is known, and examples thereof include a form in which a transparent resin contains a light absorbing material such as light absorbing particles, a light absorbing pigment or a dye.

The transparent resin for the light shielding layer 16 is also not particularly limited, and for example, polyester resin, acrylic resin, polyester acrylate resin, polyurethane acrylate resin, urethane resin, epoxy resin, polycarbonate resin, acetal resin, etc. Vinyl-based resins, polyethylene-based resins, polystyrene-based resins, polypropylene-based resins, polyamide-based resins, polyimide-based resins, melamine-based resins, phenol-based resins, silicone-based resins, fluororesins and other thermoplastic resins, thermosetting resins, Examples thereof include an ionized thermosetting resin.

When light absorbing particles are used as the light absorbing material, light absorbing colored particles such as carbon black are preferably used, but the light absorbing particles are not limited thereto. Specific examples thereof include organic fine particles colored with metal salts such as carbon black, graphite and black iron oxide, dyes and pigments, and colored glass beads. In particular, colored organic fine particles are preferably used from the viewpoints of cost, quality, availability, and the like.

The thickness of the light shielding layer 16 is not particularly limited, but is preferably 0.1 μm or more and 50 μm or less. A thicker one is easier to block light, and a thinner one is more durable against deformation such as bending and stretching. Therefore, a balanced layer can be obtained by setting the thickness within the above range. More preferably, it is 1 μm or more and 20 μm or less.
Further, the light shielding property of the light shielding layer 16 is preferably 10% or less, more preferably 1% or less, and more preferably 0.1% or less in terms of light transmittance.

The colored pattern shielding layer 17 displays the decoration such as the design drawn on the pattern layer 18 on which the pattern layer 18 is laminated so that the observer can easily see it. When the pattern layer 18 is thin and the pattern layer 18 transmits light, the colored pattern shielding layer 17 functions as a base for the pattern layer 18, so that the colored pattern shielding layer 17 has an appropriate color as a base. It is an opaque layer.
The specific structure of the colored pattern shielding layer 17 as an opaque layer having a predetermined color is known, and examples thereof include a form in which a transparent resin contains a white or a pigment or dye of a necessary color. Can be done. Therefore, the predetermined color referred to here is a concept including white.

The thickness of the colored pattern shielding layer 17 is not particularly limited, but is preferably 0.1 μm or more and 50 μm or less. The thicker the color, the darker the color and the more difficult it is to transmit light, and the thinner the color, the higher the durability against deformation such as bending and stretching. Therefore, the thickness in the above range provides a well-balanced layer. More preferably, it is 1 μm or more and 20 μm or less.

The pattern layer 18 is a layer that has been decorated (designed), and can be arranged here without particular limitation such as various patterns, color patterns, photographs, paintings, and drawings. The design of such a pattern layer 18 can be formed, for example, by printing on a base material or by printing on a colored pattern shielding layer.

The thickness of the pattern layer 18 is not particularly limited, but is preferably 0.1 μm or more and 50 μm. The thicker the color, the darker the color and the more difficult it is to transmit light, and the thinner the color, the higher the durability against deformation such as bending and stretching. Therefore, the thickness in the above range provides a well-balanced layer. More preferably, it is 1 μm or more and 20 μm or less.

The transparent protective layer 19 is a layer that protects the pattern layer 18 and the transmissive decorative screen 10 from contamination, scratches, and the like, and can be made of transparent resin, transparent glass, or the like.
When a transparent resin is used, for example, a layer made of a thermoplastic resin or a cured resin can be mentioned.

Examples of the thermoplastic resin include acrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate, polyolefin resins such as polypropylene and polyethylene, polycarbonate resins, vinyl chloride resins, polyethylene terephthalate (PET), and polybutylene terephthalate. (PBT), polyester resins such as polyethylene naphthalate (PEN), acrylonitrile-butadiene-styrene resin (ABS resin), acrylonitrile-styrene-acrylic acid ester resins and the like can be mentioned. In addition, "(meth) acrylic" means acrylic or methacrylic.

The layer made of a curable resin is a layer obtained by curing the curable resin composition, and the curable resin composition is a composition containing a curable resin. Examples of the curable resin composition include a thermosetting resin composition containing a thermosetting resin, an ionizing radiation curable resin composition containing an ionizing radiation curable resin, and the like.
Examples of the thermosetting resin include unsaturated polyester resin, polyurethane resin (including two-component curable polyurethane), epoxy resin, aminoalkyd resin, phenol resin, urea resin, diallyl phthalate resin, melamine resin, and guanamine resin. Examples thereof include melamine-urea cocondensation resin, silicon resin, and polysiloxane resin. The thermosetting resin composition contains, if necessary, components involved in the curing reaction of the thermosetting resin, for example, a catalyst, a curing agent (including a cross-linking agent, a polymerization initiator, a polymerization accelerator, etc.) and the like. You may.
The ionizing radiation curable resin is a resin that undergoes a cross-linking polymerization reaction by irradiation with ionizing radiation and changes into a three-dimensional polymer structure. Ionizing radiation has energy quanta that can polymerize or cross-link molecules among electromagnetic waves and charged particle beams. In addition to ultraviolet rays (UV) and electron beams (EB), electromagnetic waves such as X-rays and γ-rays, α Although charged particle beams such as rays and ion rays are also included, electromagnetic waves (UV) or electron beams (EB) are usually used. Among the ionizing radiation curable resins, the electron beam curable resin can be solvent-free, does not require a photopolymerization initiator, and has stable curing characteristics.
As the ionizing radiation curable resin, for example, one or more kinds of monomers, oligomers, prepolymers and the like having a polymerizable unsaturated bond, an epoxy group or the like in the molecule which can be crosslinked by irradiation with ionizing radiation can be used.

The thickness of the transparent protective layer 19 is not particularly limited, but is preferably 0.1 μm or more and 20 μm or less. If it is thin, it has high durability due to bending, etc., but it is weak in scratch resistance, and if it is thick, it is resistant to scratches and scratches, but it is weak in deformation such as bending and cracks occur. The transparent protective layer 19 can be used. More preferably, it is 1 μm or more and 10 μm or less.

The light transmitting portion 20 is a portion for transmitting image light and providing an image to the observer side, and is formed by cavities such as holes and slits in this embodiment. The light transmitting portion 20 is at least a hole or a slit that penetrates the light shielding layer 16, the colored pattern shielding layer 17, and the pattern layer 18 in the thickness direction, and such a light transmitting portion 20 is a layer surface of the transmissive decorative screen 10. Multiple inward directions are provided. 3 and 4 show a diagram illustrating an example of the shape and arrangement pattern of the light transmitting portion 20.

FIG. 3A is an example in which the hole-shaped light transmitting portions 20 having a circular cross section are arranged in a grid pattern in the vertical and horizontal directions in the layer plane.
FIG. 3B is an example in which the hole-shaped light transmitting portions 20 having a square cross section are arranged in a grid pattern in the vertical and horizontal directions in the layer plane.
In this way, the light transmitting portions 20 can be made into a pattern arranged vertically and horizontally in the layer surface. The arrangement pattern is not limited to the above-exemplified grid pattern, and an arrangement offset in a staggered manner (staggered arrangement), an arrangement according to other predetermined rules, a random arrangement, or the like can be appropriately adopted.
Further, the cross-sectional shape of each light transmitting portion 20 may be circular, triangular, quadrangular, or any other appropriate shape, and the size is not particularly limited. Further, the cross-sectional shape and / or size need not be constant in one transmissive decorative screen 10.

FIG. 4A shows a pattern in which slit-shaped light transmitting portions 20 are arranged, the light transmitting portions 20 extend in the horizontal direction, and a plurality of light transmitting portions 20 are arranged in the vertical direction.
FIG. 4B shows a pattern in which slit-shaped light transmitting portions 20 are arranged, the light transmitting portion 20 extends in the vertical direction, and a plurality of light transmitting portions 20 are arranged in the horizontal direction.
In this way, the light transmitting portion can be formed in a slit shape.

The more specific shape of the light transmitting portion is not particularly limited, but when it is circular in a plan view, its diameter is preferably 300 μm or less. It is more preferably 1 μm or more and 200 μm or less, further preferably 5 μm or more and 100 μm or less, and most preferably 10 μm or more and 50 μm or less. The smaller the diameter, the more difficult it is to see the light transmitting portion, but if it is too small, the amount of transmitted light decreases and the amount of transmitted light decreases, so that the light transmitting portion has a good balance according to the above range.
When the light transmitting portion is a quadrangle in a plan view, it may be replaced with the length of the long side as a size corresponding to the above diameter, and when the light transmitting portion is an ellipse in a plan view, it is set as a size corresponding to the above diameter. The length of the major axis may be replaced.

In the present embodiment, the light transmitting portion 20 is hollow, and the inside thereof is filled with air, but the present invention is not limited to this, and the inside of the light transmitting portion may be filled with a transparent resin.

Further, in the present embodiment, the light transmitting portion 20 penetrates the light shielding layer 16, the colored pattern shielding layer 17, and the pattern layer 18 in the thickness direction, but in addition to this, the transparent protective layer 19 also penetrates. It may be formed.

The transmissive decorative screen 10 having the above configuration can be manufactured, for example, as follows.
A light transmitting portion 20 is formed in a desired shape and pattern on the light shielding layer 16, the colored pattern shielding layer 17, and the pattern layer 18 laminated with the adhesive. This can be done by a known drilling process.
Of the surfaces of the laminated body of the light shielding layer 16, the colored pattern shielding layer 17, and the pattern layer 18 formed in this way, the light diffusion layer 15 is attached to the surface of the light shielding layer 16 with an adhesive. Further, the transparent protective layer 19 is attached to the surface of the pattern layer 18 with an adhesive.
Then, by further laminating the direction changing sheet 11 on the light diffusion layer 15 with an adhesive, the transmissive decorative screen 10 is obtained.

Next, the operation of the transmissive decorative screen 10 will be described with reference to an optical path example. However, the optical path example shown in the figure conceptually represents the path of light, and does not strictly represent the degree of refraction or the angle of reflection.

When the image light is projected from the image source 2 onto the transmissive decorative screen 10, the light emitted from the image source 2 reaches the direction change sheet 11 while spreading radially as shown by the alternate long and short dash line in FIG. Then, as shown by the image light L1 and the image light L2 in FIG. 2, the image light is incident from the incident surface 14a, totally reflected by the reflecting surface 14b, and the traveling direction is close to the normal direction of the screen surface. Can be changed. The image light L1 and the image light L2 reflected by the reflecting surface 14b reach the light diffusion layer 15.

The image light L1 that has reached the light diffusion layer 15 becomes diffused light and becomes light that can be visually recognized as an image, and also passes through the light transmitting portion 20 and reaches the observer A, so that the image light is visually recognized by the observer as image light. ..
On the other hand, the image light L2 that has reached the light diffusing layer 15 becomes diffused light and becomes visible as an image, but is absorbed here because it reaches the light shielding layer 16. Since the image light that does not reach the observer is appropriately absorbed by the light shielding layer 16, the contrast of the image light that reaches the observer can be increased without affecting other image lights.

As described above, according to the transmissive decorative screen 10, it is possible to provide a high-contrast image. Therefore, when the image light is projected from the image source 2, the observer uses the pattern of the pattern layer 18. You can see the video of appropriate quality.
Then, according to the transmissive decorative screen 10, even when the image is projected by the short focus type image source 2, the light from the image source 2 is caused by the action of the direction changing sheet 11 even at a portion distant from the image source 2. Can be appropriately directed to the observer A side, and a uniform image can be provided regardless of the position of the screen. Even when a light source that does not have video information or image information is used, for example, as illumination light, light having uniform brightness can be provided regardless of the position of the screen, and high-quality light is provided to the observer side. be able to.
Further, the transmissive decorative screen 10 can efficiently provide the observer with the image light from the image source 2. For example, when the direction change sheet 11 is not arranged, a part of the light from the light source may be reflected by the incident surface, and a part of the light may reach the ceiling without passing through the screen. According to the transmissive decorative screen 10, such light can be suppressed and provided to the observer, so that it is possible to efficiently provide a bright image.

On the other hand, when the image light is not projected from the image source 2, the observer can visually recognize the design appearing on the pattern layer 18 because the image light is not provided through the light transmitting portion 20. At this time, since at least a part of the light on the back surface side (opposite to the observer side) is absorbed by the light shielding layer 15, the design of the pattern layer 18 can be appropriately seen even if the back surface side is slightly bright.

Therefore, such a transmissive decorative screen can be applied to a wide range of applications in which an excellent appearance is required. Examples include automobile interior and exterior uses, residential and commercial facility uses, and furniture uses.
Examples of applications for the interior and exterior of automobiles include automatic internal display indicators, warning lamps, room lamps, foot lamps, illumination lamps, side lights, headlights, tail lamps, and blinkers.
Examples of uses for residential and commercial facilities include displays such as information boards, advertisements, and signboards, lighting such as lighting fixtures, windows, and show windows, and embedded displays placed on lighting, walls, doors, partitions, etc. it can.
Regarding the uses of furniture, for example, displays such as TVs, kitchens, bathrooms, bedrooms, doorphones, furniture with embedded indicators, home appliances, desks, chairs, shelves, partitions, rice cookers, geta boxes, beds, etc. Examples include refrigerators, rice cookers, microwave ovens, and washing machines.

FIG. 5 is a diagram for explaining another embodiment, which is a cross-sectional view of the transmission type projection system 101 and corresponds to FIG. As can be seen from FIG. 5, the transmissive projection system 101 includes a video source 2 and a transmissive decorative screen 110.

In the transmissive projection system 101, the short focus type image source 2 is arranged at the same height as the center of the transmissive decorative screen 110 in the vertical direction. Therefore, the transmissive decorative screen 110 is an example in which the optical element portion 113 is applied instead of the optical element portion 13 of the transmissive decorative screen 10 described above. Therefore, here, the optical element portion 113 in the direction changing sheet 111 will be described. Other parts are designated by the same reference numerals as those of the transmissive decorative screen 10 and the description thereof will be omitted.

The optical element unit 113 includes a plurality of unit optical elements 114. Also in this embodiment, each unit optical element 114 has a portion having a substantially triangular cross section, and the surfaces forming its hypotenuse are the incident surface 114a and the reflecting surface 114b.
The incident surface 114a is a surface that refracts the light from the image source 2 and causes it to enter the unit optical element 114, and is a surface on the side facing the image source 2.
On the other hand, the reflecting surface 114b is a surface that totally reflects the light incident from the incident surface 114a and turns to the observer side, and is a surface opposite to the image source 2 side.
Such a mono-optical element portion may be provided with a surface that acts as described above, and is not particularly limited, but includes, for example, a Fresnel lens layer and a prism lens layer.

In this embodiment, the light entering surface 114a of the unit optical element 114 arranged above the transmissive decorative screen 110 with the center in the vertical direction and the light entering surface of the unit optical element 114 arranged below the center thereof. The unit optical element 114 is configured in the direction facing the 114a.
As a result, even in a system in which the short focus type image source 2 is arranged at the same height position as the vertical center of the transmissive decorative screen 110, the above-mentioned effect can be obtained.

1 Transmissive projection system 2 Video source (light source)
10, 110 Transmissive decorative screen 11, 111 Direction change sheet 12 Base 13 Optical element 14 Unit optical element 15 Light diffusing layer 16 Light shielding layer 17 Colored pattern shielding layer 18 Picture layer 19 Transparent protective layer 20 Light transmitting part

Claims (4)

A transmissive decorative screen that allows the light projected from the light source to pass through to the observer.
Picture layer and
A direction change sheet that changes the direction of the incident light so that it approaches the screen normal direction, and
It has a light diffusing layer that scatters and transmits light, which is arranged between the pattern layer and the direction changing sheet.
In the pattern layer,
A plurality of light transmitting portions, which are holes or slits penetrating in the thickness direction, are arranged in the layer surface direction.
The direction change sheet is
A plurality of unit optical elements projecting on the side opposite to the pattern layer side are arranged.
The unit optical element includes an incident surface that causes the light to enter the unit optical element, and a reflecting surface that reflects the light incident from the incident surface and directs the light toward the pattern layer side.
Transparent decorative screen. A light shielding layer that absorbs light is provided between the light diffusing layer and the pattern layer.
The transmissive decorative screen according to claim 1, wherein the light transmitting portion also penetrates the light shielding layer. Light source and
A transmissive projection system comprising the transmissive decorative screen according to claim 1 or 2. The transmissive projection system according to claim 3, wherein the distance between the light emitting surface of the light source and the surface of the transmissive decorative screen is within 1 m.

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