JP6780751B2 - Transparent screen - Google Patents

Description

The present invention relates to a transparent screen.

A normal screen displays an image projected from the front or the rear to the user in the front, but since it is specialized in displaying the image, the background in the rear cannot be visually recognized by the user (see, for example, Patent Document 1). ..

Japanese Unexamined Patent Publication No. 2012-32513

A transparent screen is being developed. The transparent screen has a screen body and a transparent plate that supports the screen body.

The screen body displays the image projected from the front or the rear to the user in the front, and makes the user visually recognize the background in the rear.

When an image is projected, the light propagates while being repeatedly reflected inside the transparent screen, so that unnecessary light that does not contribute to the image display is generated. The contrast of the image may be lowered due to the brightness of unnecessary light.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a transparent screen having improved visibility of a transparent screen image.

In order to solve the above problems, according to one aspect of the present invention,
A transparent screen having a screen main body that displays an image projected from the front or the rear to the user in front and allows the user to visually recognize the background behind, and a transparent plate that supports the screen main body.
An uneven structure for reducing light reflection is formed on at least one of the end face of the screen body and the end face of the transparent plate.
A transparent screen is provided in which a light absorbing member that absorbs at least a part of light propagating inside the transparent screen when an image is projected is provided on the outer peripheral portion of the transparent screen.

According to one aspect of the present invention, there is provided a transparent screen having improved visibility of an image of the transparent screen.

It is sectional drawing of the transparent screen by one Embodiment. It is sectional drawing which shows the structure of the outer peripheral part of the transparent screen by one Embodiment. It is sectional drawing which shows the structure of the outer peripheral part of the transparent screen by a modification. It is sectional drawing which shows the structure of the reflection type screen sheet by one Embodiment. It is sectional drawing which shows the structure of the transmission type screen sheet by one Embodiment. It is sectional drawing which shows the structure of the transmission type screen sheet by a modification.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In each drawing, the same or corresponding configurations are designated by the same or corresponding reference numerals and the description thereof will be omitted.

FIG. 1 is a cross-sectional view of a transparent screen according to an embodiment. In FIG. 1, the solid line shows the arrangement of the projector 12 when the transparent screen 20 is a reflective type, and the broken line shows the arrangement of the projector 12 when the transparent screen 20 is a transmissive type. The user 10 side (left side in FIG. 1) is referred to as the front with respect to the transparent screen 20, and the side opposite to the user 10 (right side in FIG. 1) with respect to the transparent screen 20 is referred to as the rear. The same applies to FIGS. 2 to 6.

The transparent screen 20 displays the image projected from the front or rear projector 12 to the front user 10 and makes the user 10 visually recognize the rear background. The background behind the image may be visible when the image is not projected, and may be visible when the image is projected, but may not be visible.

The transparent screen 20 may be either a flat screen or a curved screen. The curved screen may be either one having a convex shape toward the user 10 or one having a concave shape toward the user 10.

The transparent screen 20 has a laminated plate composed of a plurality of transparent plates 30 and 40 and a screen main body 50 provided between the plurality of transparent plates 30 and 40. Further, the transparent screen 20 has a light absorbing member 60 provided in contact with the outer peripheral portion of the laminated plate. The light absorbing member 60 may be provided over the entire circumference of the outer peripheral portion of the laminated plate, but may be provided on at least a part of the outer peripheral portion of the laminated plate.

The plurality of transparent plates 30 and 40 protect the screen main body 50 from both front and rear sides by sandwiching the screen main body 50 from both front and rear sides. The plurality of transparent plates 30 and 40 are, for example, glass plates, respectively. In this case, laminated glass is obtained as the laminated plate. The thickness of the transparent plate 30 and the thickness of the transparent plate 40 can be arbitrarily selected according to the strength and design of the transparent screen 20, respectively.

The plurality of glass plates sandwiching the screen body 50 may be either untempered glass or tempered glass, respectively. Untempered glass is made by molding molten glass into a plate shape and slowly cooling it. Examples of the molding method include a float method and a fusion method. The tempered glass may be either physically tempered glass or chemically tempered glass. Physically tempered glass is a glass surface that has been strengthened by rapidly cooling a uniformly heated glass plate from a temperature near the softening point and causing compressive stress on the glass surface due to the temperature difference between the glass surface and the inside of the glass. .. Chemically tempered glass is a glass surface that has been strengthened by generating compressive stress on the glass surface by an ion exchange method or the like.

The transparent plates 30 and 40 of the present embodiment are glass plates, respectively, but may be resin plates. Further, of the plurality of transparent plates 30 and 40, one may be a glass plate and the other may be a resin plate. Further, the number of transparent plates included in the laminated plate may be three or more.

FIG. 2 is a cross-sectional view showing the structure of the outer peripheral portion of the transparent screen according to the embodiment. The screen body 50 has, for example, a plurality of adhesive layers 51 and 52 and a screen sheet 53 sandwiched between the plurality of adhesive layers 51 and 52.

The plurality of adhesive layers 51 and 52 are provided so as to sandwich the screen sheet 53, and the screen sheet 53 is adhered to the plurality of transparent plates 30 and 40. The thickness of the adhesive layer 51 and the thickness of the adhesive layer 52 are not limited, but are, for example, 0.01 to 1.5 mm, preferably 0.05 to 0.5 mm, respectively.

The plurality of adhesive layers 51 and 52 may be formed of different materials, but are preferably formed of the same material. The adhesive layers 51 and 52 are formed of, for example, a thermoplastic resin, a thermosetting resin, an ultraviolet curable resin, or the like.

In the case of a thermoplastic resin or a thermosetting resin, adhesion is performed by heat treatment. On the other hand, in the case of an ultraviolet curable resin, adhesion is performed by irradiation with ultraviolet rays.

Examples of the thermoplastic resin include ethylene-vinyl acetate copolymer, polyvinyl butyral, plasticized polyvinyl acetal, plasticized polyvinyl chloride, plasticized saturated thermoplastic polyester, thermoplastic polyurethane, and ethylene-ethyl acrylate copolymer.

Examples of the thermosetting resin include acrylic thermosetting resins, thermosetting epoxy resins, and polyurethane curable resins.

Examples of the ultraviolet curable resin include acrylic photocurable resin, photocurable epoxy resin, urethane acrylate photocurable resin and the like.

The screen sheet 53 displays the image projected from the front or rear projector 12 to the front user 10 and makes the rear background visible to the user 10. The specific structure of the screen sheet 53 will be described later.

The screen sheet 53 is used by being sandwiched between a plurality of transparent plates 30 and 40. The screen sheet 53 does not have to be flexible, but is preferably flexible. Easy to apply to curved screens. The thickness of the screen sheet 53 can be arbitrarily set according to the manufacturing method of the screen sheet 53, the visibility of the projected image, and the like, and is, for example, 0.02 to 1.5 mm.

The screen sheet 53 of the present embodiment is used by being sandwiched between a plurality of transparent plates 30 and 40, but may be used by being attached to only one of the plurality of transparent plates 30 and 40. The transparent plate 30 or 40 of the above may not be provided. The screen body 50 can be supported by one transparent plate.

In the front-back direction, the size of the screen sheet 53 may be the same as the size of the plurality of transparent plates 30 and 40. In this case, as shown in FIG. 2, the end face of the screen body 50 is composed of the end face of the screen sheet 53 and the end faces of the plurality of adhesive layers 51 and 52.

The size of the screen sheet 53 may be smaller than the size of the plurality of transparent plates 30 and 40 when viewed in the front-rear direction. In this case, as shown in FIG. 3, the plurality of adhesive layers 51 and 52 wrap around the end faces of the screen sheet 53, and the end face of the screen main body 50 is composed of only the end faces of the plurality of adhesive layers 51 and 52.

By the way, when an image is projected, the light propagates while being repeatedly reflected inside the transparent screen 20, so that unnecessary light that does not contribute to the image display is generated.

Therefore, a light absorbing member 60 is provided on the outer peripheral portion of the transparent screen 20. By absorbing unnecessary light that does not contribute to the image display, the light absorbing member 60 can suppress a decrease in contrast of the image due to the brightness of the unnecessary light. Therefore, the image visibility of the transparent screen 20 can be improved.

For example, as shown in FIGS. 2 and 3, the light absorbing member 60 may be provided in contact with the end surface of the screen body 50. In this case, the difference in refractive index between the two sides of the screen body 50 is smaller than that in the case where the end face of the screen body 50 is in contact with air. Therefore, the light propagating inside the screen body 50 when the image is projected is not easily reflected inside the end face of the screen body 50 and is easily emitted to the outside. At least a part of the emitted light propagates inside the light absorbing member 60, is reflected at the interface between the light absorbing member 60 and air, and is absorbed by the light absorbing member 60 before returning to the screen body 50. Converted to heat.

This effect is remarkable when a plurality of transparent plates 30 and 40 sandwich the screen body 50. In this case, when the image is projected, the light propagating inside the screen body 50 easily propagates to a long distance while repeatedly reflecting at the interface between the screen body 50 and the transparent plates 30 and 40.

Further, as shown in FIGS. 2 and 3, the light absorbing member 60 may be provided in contact with the end faces of the transparent plates 30 and 40. In this case, the difference in refractive index between the end faces of the transparent plates 30 and 40 is smaller than that in the case where the end faces are in contact with air. Therefore, the light propagating inside the transparent plates 30 and 40 when the image is projected is not easily reflected inside the end faces of the transparent plates 30 and 40, and is easily emitted to the outside. At least a part of the emitted light propagates inside the light absorbing member 60, is reflected at the interface between the light absorbing member 60 and air, and is reflected by the light absorbing member 60 before returning to the transparent plates 30 and 40. It is absorbed and converted into heat.

Further, as shown in FIGS. 2 and 3, the light absorbing member 60 may be provided across the end face of the transparent plate 30 on the front side and the end face of the transparent plate 40 on the rear side, and seals the screen body 50. You may. Deterioration of the screen body 50 due to moisture can be suppressed.

The light absorbing member 60 of the present embodiment is in contact with both the end face of the transparent plate 30 on the front side and the end face of the transparent plate 40 on the rear side, but may be in contact with only one of them.

Further, as shown in FIGS. 2 and 3, the light absorbing member 60 is an outer peripheral portion of the surface of each of the transparent plates 30 and 40 opposite to the screen main body 50 side (hereinafter, also referred to as “outer surface”). It may be provided in contact with. In this case, the difference in refractive index on both sides of the outer peripheral portion is smaller than that in the case where the outer peripheral portion of the outer surfaces of the transparent plates 30 and 40 is in contact with air. Therefore, the light propagating inside the transparent plates 30 and 40 when the image is projected is not easily reflected inside the outer peripheral portion of the outer surfaces of the transparent plates 30 and 40, and is easily emitted to the outside. At least a part of the emitted light propagates inside the light absorbing member 60, is reflected at the interface between the light absorbing member 60 and air, and is reflected by the light absorbing member 60 before returning to the transparent plates 30 and 40. It is absorbed and converted into heat.

The light absorbing member 60 of the present embodiment includes an outer peripheral portion of the outer surface (that is, the front surface) of the front transparent plate 30 and an outer peripheral portion of the outer surface (that is, the rear surface) of the rear transparent plate 40. Although it touches both of them, it may touch only one of them.

Further, as shown in FIGS. 2 and 3, the light absorbing member 60 may be provided on the outer peripheral portion of the front surface of the transparent screen 20. Unwanted light can be suppressed from the outer peripheral portion of the front surface of the transparent screen 20, and the contrast of the image displayed on the remaining central portion can be improved.

By the way, the unnecessary light emitted from the end face of the transparent screen 20 is invisible to the user.

Therefore, a fine uneven structure is formed on at least one of (A) the end face of the transparent plate 30 on the front side, (B) the end face of the transparent plate 40 on the rear side, and (C) the end face of the screen body 50. , The reflection reduction effect may be imparted. At these end faces, unnecessary light is less likely to be reflected inside and easily emitted to the outside.

The uneven structure is formed by, for example, a roughening treatment such as an etching treatment or a sandblast treatment. The uneven structure may be covered by the light absorbing member 60, and unnecessary light emitted from the uneven structure may be absorbed by the light absorbing member 60.

The uneven structure can also change the direction of light going inward. Therefore, on the front surface and the rear surface of the transparent screen 20, the amount of unnecessary light incident at an incident angle equal to or less than the total reflection angle can be increased, and the amount of unnecessary light reflected toward the inside can be reduced again.

The light absorbing member 60 may be formed in a U shape, and may cover from the outer peripheral portion of the outer surface of the front transparent plate 30 to the outer peripheral portion of the outer surface of the rear transparent plate 40. Good. When the outer peripheral portion of the transparent screen 20 is inserted into a groove of a holding member (not shown) and held by the holding member, the light absorbing member 60 may serve as a filling member that fills a gap with the wall surface of the groove.

The light absorbing member 60 includes (1) an end face of the screen body 50, (2) an end face of at least one transparent plate, (3) an outer peripheral portion of the outer surface of at least one transparent plate, and (4) a transparent screen. It may be provided on one or more of the outer peripheral portions of the front surface of the screen.

The light absorbing member 60 may include a material having a light absorption coefficient larger than that of each material of the screen body 50 and each of the transparent plates 30 and 40.

The light absorbing member 60 may include at least one of a pigment and a dye. Pigments and dyes are used in a state of being dispersed or dissolved in a resin. As the pigment, for example, carbon black, graphite, titanium black, ferric oxide, organic pigment and the like are used. As the dye, for example, an azo dye, an anthraquinone dye, indigo dye, phthalocyanine dye and the like are used.

As the resin that disperses or dissolves the pigment and the dye, urethane resin, acrylic resin, epoxy resin, polyester resin, silicone resin, vinyl chloride resin, butyl rubber resin, polyisobutylene resin, polysulfide resin and the like are used. Further, as the light absorbing member 60, a commercially available one can be used. For example, product name Sikaflex 265 (manufactured by Sika Japan, urethane resin, black), etc.

The color of the light absorbing member may be a dark color such as black.

As a method of providing the light absorbing member 60 as shown in FIGS. 1 to 3, for example, a method of pasting a sheet-shaped light absorbing member, a method of fitting a light absorbing member formed in a U-shaped cross section, or a liquid liquid absorbing member 60. There is a method of coating a light absorbing member.

FIG. 4 is a cross-sectional view showing the structure of the reflective screen sheet according to the embodiment. The reflective screen sheet 53A shown in FIG. 4 is used in place of the screen sheet 53 shown in FIGS. 1 to 3. The reflective screen sheet 53A displays the image projected from the front projector 12 to the front user 10 and makes the rear background visible to the user 10.

For example, as shown in FIG. 4, the screen sheet 53A has a base material 54A, an uneven layer 55A, a light reflecting layer 56A, a coating layer 57A, and a protective layer 58A in this order from the front side to the rear side. In this case, the uneven layer 55A, the light reflecting layer 56A, the coating layer 57A, and the protective layer 58A are formed on the surface of the base material 54A in this order.

The thickness of the base material 54A and the thickness of the protective layer 58A can be arbitrarily selected depending on the production method, and are, for example, 0.01 to 0.5 mm, preferably 0.05 to 0.3 mm. The total thickness of the uneven layer 55A, the light reflecting layer 56A, and the coating layer 57A can be arbitrarily selected depending on the manufacturing method, and is, for example, 1 to 100 μm.

The arrangement of the base material 54A and the protective layer 58A may be reversed, and the screen sheet 53A has the protective layer 58A, the coating layer 57A, the light reflecting layer 56A, the uneven layer 55A, and the base material from the front side to the rear side. 54A may be provided in this order.

The base material 54A may be either a glass sheet or a resin sheet, but is preferably a resin sheet from the viewpoint of flexibility. The resin sheet is made of, for example, polycarbonate, PET, PEN, cycloolefin polymer, or polyester.

The uneven layer 55A is formed on the surface of the base material 54A and has irregularities on the surface opposite to the base material 54A. The uneven layer 55A may be formed of a resin. As a method for forming the uneven layer 55A, for example, an imprint method or the like is used. As the resin material of the imprint method, any of a photocurable resin, a thermoplastic resin, and a thermosetting resin may be used.

The uneven structure of the uneven layer 55A may be a microarray, a hologram, or the like, in addition to the structure shown in FIG.

The light reflecting layer 56A is formed in a zigzag shape along the unevenness of the surface of the uneven layer 55A. The light reflecting layer 56A reflects a part of the light from the front to the front and transmits a part of the light from the back to the front. The light reflecting layer 56A may be formed of, for example, a metal such as aluminum or silver, a metal oxide, or a metal nitride. As a method for forming the light reflecting layer 56A, for example, a vacuum vapor deposition method or a sputtering method is used.

The coating layer 57A fills the unevenness of the light reflecting layer 56A. The coating layer 57A may be formed of a resin, and is preferably formed of the same resin as the uneven layer 55A.

The protective layer 58A is a sheet that protects the coating layer 57A. The protective layer 58A may be either a transparent glass sheet or a transparent resin sheet, but is preferably a transparent resin sheet from the viewpoint of flexibility. The resin sheet is made of, for example, polycarbonate, PET, PEN, cycloolefin polymer, or polyester.

The uneven layer 55A of the present embodiment is formed on the surface of the base material 54A, but instead, it may be formed on the surface of any one of the plurality of transparent plates 30 and 40. Further, the coating layer 57A of the present embodiment is protected by the protective layer 58A, but instead, it may be protected by any one of the plurality of transparent plates 30 and 40. In these cases, the plurality of adhesive layers 51 and 52, the base material 54A, and the protective layer 58A are unnecessary.

FIG. 5 is a cross-sectional view showing the structure of the transmissive screen sheet according to the embodiment. The transmissive screen sheet 53B shown in FIG. 5 is used in place of the screen sheet 53 shown in FIGS. 1 to 3. The transmissive screen sheet 53B displays the image projected from the rear projector 12 to the front user 10 and makes the rear background visible to the user 10.

The transmissive screen sheet 53B has a light scattering layer 55B and a base material 54B in this order from the front side to the rear side, for example, as shown in FIG. The thickness of the base material 54B can be arbitrarily selected depending on the method for producing the base material 54B, and is, for example, 0.01 to 0.5 mm, preferably 0.05 to 0.3 mm. The thickness of the light scattering layer 55B can be arbitrarily selected depending on the method for producing the light scattering layer 55B, and is, for example, 1 to 200 μm.

The arrangement of the base material 54B and the light scattering layer 55B may be reversed, and the screen sheet 53B may have the base material 54B and the light scattering layer 55B in this order from the front side to the rear side.

The base material 54B may be either a glass sheet or a resin sheet, but is preferably a resin sheet from the viewpoint of flexibility. The resin sheet is made of, for example, polycarbonate, PET, PEN, or cycloolefin polymer.

The light scattering layer 55B includes a transparent material and a light scattering material having a refractive index different from that of the transparent material. As the transparent material, for example, a transparent resin is used. Examples of the transparent resin include a photocurable resin such as an acrylic resin and an epoxy resin, a thermosetting resin, and a thermoplastic resin. On the other hand, as the light scattering material, fine particles of an inorganic material, fine particles of an organic material, voids and the like are used. Inorganic materials include high refractive index materials such as titanium oxide (refractive index: 2.5 to 2.7), zirconium oxide (refractive index: 2.4), aluminum oxide (refractive index: 1.76), and porous materials. Low refractive index materials such as silica (refractive index: 1.25 or less) and hollow silica (refractive index: 1.25 or less) are used. The light scattering material may be dispersed in the transparent material. The ratio of the light scattering material to the light scattering layer 55B is, for example, 0.01% by volume or more and 5% by volume or less, preferably 0.05% by volume or more and 1% by volume or less.

The light scattering layer 55B may further contain a light absorbing material. As the light absorbing material, carbon black, titanium black or the like can be used. The ratio of the light absorbing material to the light scattering layer 55B is, for example, 0.01% by volume or more and 5% by volume or less, preferably 0.1% by volume or more and 3% by volume or less. The light absorbing material suppresses the propagation of light due to repeated reflection of light inside the transparent screen. As a result, blurring of the image can be suppressed.

As shown in FIG. 6, the light scattering layer 55B may be a layer in which a plurality of light scattering portions 57B are arranged at intervals in the transparent resin portion 56B. This arrangement is called a louver structure. The light scattering unit 57B includes a light scattering material and a transparent material. As the transparent resin portion 56B, the same transparent material as that used in the light scattering layer 55B shown in FIG. 5 can be used.

The light scattering layer 55B of the present embodiment is formed on the surface of the base material 54B, but may be formed on the surface of any one of the plurality of transparent plates 30 and 40 instead. Further, although the light scattering layer 55B of the present embodiment is covered with an adhesive layer, it may be covered with any one of the plurality of transparent plates 30 and 40. In these cases, the plurality of adhesive layers 51 and 52 and the base material 54B are unnecessary.

Although the embodiment of the transparent screen has been described above, the present invention is not limited to the above embodiment, and various modifications and improvements can be made within the scope of the gist of the present invention described in the claims. is there.

For example, the transparent screen may have a functional layer (not shown) in FIGS. 4-6. Examples of the functional layer include a light reflection prevention layer that reduces light reflection, a light attenuation layer that attenuates a part of light, and an infrared shielding layer that suppresses infrared transmission. The number of functional layers and the position of the functional layers are not particularly limited.

The optical characteristics of the reflective transparent screen are preferably such that the transmittance is 5% or more and 90% or less, the reflectance is 5% or more and 70% or less, and the front haze is 20% or less. Transmittance, reflectance, and forward haze are measured using the D65 light source specified in JIS Z8720 (2012) "Standard Illuminant for Color Measurement (Standard Light) and Standard Light Source", respectively. The rear haze means the degree of cloudiness (%) in the reflection of light incident on the transparent screen, and the total reflectance (%) measured by the D65 light source is the diffuse reflectance (%) measured by the D65 light source. It is shown by the ratio (%) divided by.

The optical characteristics of the transmissive transparent screen are that the transmittance is 5% or more and 90% or less, the front haze is 4% or more and 40% or less, and the rear haze is 0% or more and 60% or less. preferable. Transmittance, forward haze, and backward haze are measured using the D65 light source specified in JIS Z8720 (2012) "Standard Illuminant (Standard Light) and Standard Light Source for Color Measurement", respectively.

10 User 20 Transparent screen 30 Transparent plate 40 Transparent plate 50 Screen body 51 Adhesive layer 52 Adhesive layer 53 Screen sheet 53A Reflective screen sheet 54A Base material 55A Concavo-convex layer 56A Light reflection layer 57A Coating layer 58A Protective layer 53B Transmissive screen Sheet 54B Base material 55B Light scattering layer 60 Light absorbing member

Claims (10)

A transparent screen having a screen main body that displays an image projected from the front or the rear to the user in front and allows the user to visually recognize the background behind, and a transparent plate that supports the screen main body.
An uneven structure for reducing light reflection is formed on at least one of the end face of the screen body and the end face of the transparent plate.
A transparent screen in which a light absorbing member that absorbs at least a part of light propagating inside the transparent screen when an image is projected is provided on the outer peripheral portion of the transparent screen. The transparent screen according to claim 1, wherein the light absorbing member is provided in contact with an end surface of the screen body. The transparent screen according to claim 1 or 2, wherein the light absorbing member is provided in contact with an end surface of the transparent plate. The transparent screen according to any one of claims 1 to 3, wherein the light absorbing member is provided on an outer peripheral portion of the surface of the transparent plate opposite to the screen main body side. The transparent screen according to any one of claims 1 to 4, wherein the light absorbing member is provided on an outer peripheral portion of the front surface of the transparent screen. The transparent screen according to any one of claims 1 to 5, wherein the light absorbing member contains at least one of a pigment and a dye. The transparent screen according to any one of claims 1 to 6, wherein the transparent plate is provided on both sides of the screen body. The transparent screen according to any one of claims 1 to 7, wherein the transparent plate is a glass plate. The screen body
The image projected from the front is displayed to the user in front.
An uneven layer with irregularities on the surface and
A light-reflecting layer formed along the unevenness of the surface of the uneven layer, reflecting a part of light from the front to the front and transmitting a part of light from the rear to the front.
The transparent screen according to any one of claims 1 to 8, further comprising a coating layer that covers the unevenness of the light reflecting layer. The screen body
The image projected from the rear is displayed to the user in the front.
The transparent screen according to any one of claims 1 to 8, further comprising a transparent material and a light scattering layer containing a light scattering material having a refractive index different from that of the transparent material.

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