JP2017102307A - Method for producing transparent screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a transparent screen which reduces joints of a plurality of resin films that are planarly aligned.SOLUTION: In a method for producing a transparent screen 20 which displays a projected video image on a user 10 in front and allows the user in front to visually recognize a back ground in the rear part, the transparent screen 20 has transparent plates 30 and 40, a plurality of resin films 70 arranged along main surfaces of the transparent plates 30 and 40 and a video image display layer 60 that is formed on at least one resin film 70 and displays a video image, the transparent plates 30 and 40 support the plurality of resin films 70 and has a bonding step of bonding the plurality of resin films 70 and the transparent plates 30 and 40 by heat treatment, and each of the resin films 70 is subjected to low shrinkage treatment by heat treatment of 80°C-200°C prior to the bonding step.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for manufacturing a transparent screen.

  A normal screen displays a video projected from the front or the rear to the user in front, but because it specializes in video display, the user cannot visually recognize the back background (see, for example, Patent Document 1). .

JP 2012-32513 A

  Transparent screens are being developed. The transparent screen includes a screen sheet that displays an image projected from the front or the rear to the front user and allows the front user to visually recognize the back background, and a transparent plate that supports the screen sheet.

  By the way, a plurality of screen sheets or the like may be arranged in a planar shape, and a plurality of resin films constituting the screen sheet or the like may be arranged in a planar shape. In this case, the resin film may shrink due to heat treatment during the production of the transparent screen, and the joints of the plurality of resin films arranged in a planar shape may be enlarged.

  The present invention has been made in view of the above problems, and a main object of the present invention is to provide a method for producing a transparent screen in which joints between a plurality of resin films arranged in a planar shape are reduced.

In order to solve the above problems, according to one aspect of the present invention,
A method of manufacturing a transparent screen that displays a projected image to a user in front and allows a user in front to visually recognize a back background,
The transparent screen includes a transparent plate, a plurality of resin films arranged along the main surface of the transparent plate, and an image display layer that is formed on at least one of the resin films and displays the image. And the transparent plate supports the plurality of resin films,
Having a bonding step of bonding a plurality of the resin films and the transparent plate by heat treatment;
Each of the resin films is provided with a method for producing a transparent screen, which is subjected to a low shrinkage treatment by heat treatment at 80 ° C. to 200 ° C. before the bonding step.

  According to one aspect of the present invention, there is provided a method for producing a transparent screen in which joints between a plurality of resin films arranged in a planar shape are reduced.

It is a side view of the transparent screen by one Embodiment. It is a side view of an example of a reflective transparent screen. It is a side view of the modification of a reflection type transparent screen. It is a side view of an example of a transmissive transparent screen. It is a side view of the modification of a transmissive | pervious transparent screen. It is a front view of the resin film inside the transparent screen of FIG. 3 is a flowchart of a method for manufacturing a transparent screen according to an embodiment. It is a flowchart of the manufacturing method of the transparent screen by a 1st modification. It is explanatory drawing of the tape fixing process shown in FIG. It is a flowchart of the manufacturing method of the transparent screen by the 2nd modification. It is explanatory drawing of the filling process shown in FIG. It is a figure of the modification of how to arrange a plurality of resin films. It is a side view of the modification of a transparent screen.

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

(Transparent screen)
FIG. 1 is a cross-sectional view of a transparent screen according to an embodiment. 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) is referred to as the rear with respect to the transparent screen 20. The same applies to FIGS.

  The transparent screen 20 displays an image projected from the front or / and the rear to the front user 10 and makes the front user 10 visually recognize the back background. The background behind the screen may be visible when the image is not projected, and may or may not be visible when the image is projected, but is preferably not visible. The video is projected on the main surface of the transparent screen 20.

  The transparent screen 20 may be 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 includes, for example, a laminated plate that includes a plurality of transparent plates 30 and 40 and a screen sheet 50 provided between the plurality of transparent plates 30 and 40. The screen sheet 50 is bonded to the transparent plate 30 by the adhesive layer 31 and is bonded to the transparent plate 40 by the adhesive layer 41. The plurality of transparent plates 30 and 40 and the screen sheet 50 are bonded so that the main surfaces face each other.

(Transparent plate)
The plurality of transparent plates 30 and 40 support the screen sheet 50 from both front and rear sides by sandwiching the screen sheet 50 from both front and rear sides. Each of the plurality of transparent plates 30 and 40 is, for example, a glass plate. In this case, a laminated glass is obtained as a laminated plate.

  Each of the plurality of glass plates sandwiching the screen sheet 50 may be either untempered glass or tempered glass. Untempered glass is obtained by forming 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 strengthens the glass surface by rapidly cooling a uniformly heated glass plate from a temperature near the softening point and generating a 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 obtained by strengthening the glass surface by generating a compressive stress on the glass surface by an ion exchange method or the like.

  In addition, although the transparent plates 30 and 40 of this embodiment are glass plates, respectively, a resin plate may be sufficient. One of the plurality of transparent plates 30 and 40 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.

(Adhesive layer)
The plurality of adhesive layers 31 and 41 are provided with the screen sheet 50 interposed therebetween, and adhere the screen sheet 50 to the plurality of transparent plates 30 and 40. Although the thickness of the contact bonding layers 31 and 41 is not limited, respectively, For example, it is 0.01-1.5 mm, Preferably it is 0.3-0.8 mm.

  The plurality of adhesive layers 31 and 41 may be formed of different materials, but are preferably formed of the same material. The adhesive layers 31 and 41 are formed of, for example, a thermoplastic resin, a thermosetting resin, or an ultraviolet curable resin.

  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 ultraviolet irradiation.

  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 resins, photocurable epoxy resins, and urethane acrylate photocurable resins.

(Screen sheet)
The screen sheet 50 is used by being sandwiched between a plurality of transparent plates 30 and 40. The screen sheet 50 may not have flexibility, but preferably has flexibility. Although the thickness of the screen sheet 50 can be arbitrarily set according to the manufacturing method of the screen sheet 50, the visibility of the projected image, and the like, for example, 0.02 to 1.5 mm is preferable.

  The screen sheet 50 includes a video display layer 60 and a resin film 70. The video display layer 60 displays the video projected from the projector 12. The size of the main surface of the video display layer 60 is the same as the size of the main surface of the resin film 70, but may be smaller than the size of the main surface of the resin film 70. The resin film 70 supports the video display layer 60. The resin film 70 may support a plurality of video display layers 60 having a smaller main surface than the resin film 70 at intervals.

  The resin film 70 supports the video display layer 60 from both front and rear sides, and one is used as a base film and the other as a protective film. The base film is a base material used for forming the video display layer 60. The protective film protects the video display layer 60. Note that the protective film may not be provided.

  When the resin films 70 are disposed on both the front and rear sides with the image display layer 60 interposed therebetween, the front resin film 70 and the rear resin film 70 may be the same type or different types, but are preferably the same type. Moreover, when the resin film 70 has adhesiveness, you may serve as the contact bonding layers 31 and 41. FIG.

(Reflective transparent screen)
FIG. 2 is a side view of an example of a reflective transparent screen. The reflective transparent screen shown in FIG. 2 has a reflective video display layer 60A. The video display layer 60A includes an uneven layer 61A, a light transmission diffuse reflection layer 62A, and a covering layer 63A in this order. The video display layer 60A and the resin film 70 constitute a reflective screen sheet 50A.

  The uneven layer 61A is formed on the surface of the base film, and has unevenness on the surface opposite to the base film. The uneven layer 61A may be formed of a resin. As the resin, a resin used for the adhesive layer 31 or the adhesive layer 41 can be used. As a method for forming the uneven layer 61A, for example, an imprint method or the like is used. As the resin material for the imprint method, any of a photocurable resin, a thermoplastic resin, and a thermosetting resin may be used.

  The light transmission diffuse reflection layer 62A is formed in a zigzag shape along the unevenness of the surface of the uneven layer 61A. The light transmission diffuse reflection layer 62A reflects part of the light from the front and rear and transmits the other part of the light from the front and rear. The light transmission diffuse reflection layer 62 </ b> A has an uneven surface on the front surface, and displays the image by diffusing and reflecting the light of the image projected from the front.

  The light transmission diffuse reflection layer 62A may be formed of a material that reflects light, for example, a metal such as aluminum or silver, a metal oxide, or a metal nitride. The light transmission diffuse reflection layer 62A may have either a single layer structure or a multilayer structure. As a method for forming the light transmission diffuse reflection layer 62A, for example, a vacuum deposition method or a sputtering method is used.

  The coating layer 63A fills the irregularities on the surface of the light transmission diffuse reflection layer 62A. The covering layer 63A may be formed of a resin, and is preferably formed of the same resin as the uneven layer 61A.

(Modification of reflective transparent screen)
FIG. 3 is a side view of a modification of the reflective transparent screen. The reflective transparent screen shown in FIG. 3 has a reflective video display layer 60B. The video display layer 60B includes a light transmission diffuse reflection layer 62B. The video display layer 60B and the resin film 70 constitute a reflective transparent screen sheet 50B.

  The light transmission diffuse reflection layer 62B is formed on the surface of the base film. The light transmission diffuse reflection layer 62B includes a plurality of light reflection particles 64B and a transparent material 65B such as a resin that holds the light reflection particles 64B. The plurality of light reflecting particles 64B are arranged with a gap as viewed in the front-rear direction. The light transmission diffuse reflection layer 62B reflects a part of the light from the front and the rear and transmits the other part of the light from the front and the rear. The light transmission diffuse reflection layer 62B has a plurality of light reflecting particles 64B arranged with a gap in the front-rear direction, and displays the image by diffusing and reflecting the light of the image projected from the front.

The light reflecting particles 64B included in the light transmissive diffuse reflecting layer 62B are made of a material that reflects light, for example, a metal such as aluminum, silver, or gold, a metal oxide such as ITO, ATO, titania, or zirconia, or Si ₃ N ₄ , It may be formed of a metal nitride such as TaN or a mineral such as diamond. Further, the light reflecting particles 64 may be coated.

  The light transmission diffuse reflection layer is not limited to the light transmission diffuse reflection layer 62A shown in FIG. 2 and the microarray type light transmission diffuse reflection layer 62B shown in FIG. Also good. The hologram-type light transmission diffuse reflection layer diffracts light into a plurality of orders.

(Transparent transparent screen)
FIG. 4 is a side view of an example of a transmissive transparent screen. The transmissive transparent screen shown in FIG. 4 has a transmissive image display layer 60C. The video display layer 60C has a light transmission / scattering layer 66C. The video display layer 60C and the resin film 70 constitute a transmissive screen sheet 50C.

  The light transmission / scattering layer 66C is formed on the surface of the base film. The light transmission / scattering layer 66C scatters part of the light from the front and rear and transmits the other part of the light from the front and rear. The light transmission / scattering layer 66 </ b> C displays an image for the user 10 ahead by scattering the light of the image projected from behind.

  The light transmission / scattering layer 66C includes a transparent material 67C and a light scattering material 68C dispersed in the transparent material 67C. For example, a transparent resin is used as the transparent material 67C. Examples of the transparent resin include photo-curing resins such as acrylic resins and epoxy resins, thermosetting resins, and thermoplastic resins. On the other hand, the light scattering material 68C is made of a material having a refractive index different from that of the transparent material 67C. For example, as the light scattering material 68C, fine particles of inorganic material, fine particles of organic material, voids, and the like are used. As the inorganic material, titanium oxide (refractive index: 2.5 to 2.7), zirconium oxide (refractive index: 2.4), aluminum oxide (refractive index: 1.76), diamond (refractive index: 2.4). ), A high refractive index material such as diamond-like carbon, or a low refractive index material such as porous silica (refractive index: 1.25 or less) or hollow silica (refractive index: 1.25 or less).

  The light transmission / scattering layer 66C may further include a light absorbing material therein. As the light absorbing material, carbon black, titanium black, or the like can be used. The light absorbing material absorbs a part of the light propagating through the light transmission / scattering layer 66C, thereby suppressing light propagation due to repeated reflection of light inside the transparent screen. Thereby, unnecessary light that does not contribute to the display of the image can be absorbed, and the contrast of the image can be improved.

The light transmission / scattering layer 66C is formed, for example, by applying a liquid containing the transparent material 67C and the light scattering material 68C to the surface of the base film and performing a heat treatment. The liquid applied to the surface of the base film may further include a light absorbing material in addition to the transparent material 67C and the light scattering material 68C.
When the transparent material 67C is a thermoplastic resin, the light transmission / scattering layer 66C can also be formed by kneading and dispersing the light scattering material 68C in a heat-melted thermoplastic resin and molding it into a sheet.

  The light transmission / scattering layer 66C may be formed by embedding or sintering the light scattering material 68C on the surface of the sheet formed of the transparent material 67C. In this case, a base film is unnecessary. In this case, the light scattering material 68C is preferably embedded or sintered near the front surface of the light transmission / scattering layer 66C. Furthermore, in this case, the transparent plate 30 is not provided, and the light transmission / scattering layer 66C may be the outermost layer. When the light scattering material 68C is present near the front surface of the light transmission / scattering layer 66C, regular reflection light from the projector 12 can be suppressed.

(Modification of transmissive transparent screen)
FIG. 5 is a side view of a modification of the transmissive transparent screen. The transmissive transparent screen shown in FIG. 5 includes a transmissive image display layer 60D. The video display layer 60D has a light transmission / scattering layer 66D. The video display layer 60D and the resin film 70 constitute a transmissive transparent screen sheet 50D.

  The light transmission / scattering layer 66D is formed on the surface of the base film. The light transmission / scattering layer 66D scatters a part of the light from the front and the rear and transmits the other part of the light from the front and the rear. The light transmission / scattering layer 66 </ b> D displays an image for the user 10 ahead by scattering light of the image projected from behind. The light transmission / scattering layer 66D includes an uneven layer 67D and a coating layer 68D.

  The uneven layer 67D is formed on the surface of the base film, and has an uneven surface on the surface opposite to the base film. The uneven layer 67D may be formed of a resin. As a method for forming the uneven layer 67D, for example, an imprint method or the like is used. As the resin material for the imprint method, any of a photocurable resin, a thermoplastic resin, and a thermosetting resin may be used.

  The coating layer 68D fills the unevenness on the surface of the uneven layer 67D. The covering layer 68D is formed of a resin having a refractive index different from that of the uneven layer 67D. Light is scattered at the interface between the coating layer 68D and the uneven layer 67D.

  The light transmission / scattering layer 66D may further include a light absorbing material therein. The light absorbing material is included in at least one of the uneven layer 67D and the covering layer 68D. As the light absorbing material, carbon black, titanium black, organic dye, or the like can be used. The light absorbing material absorbs part of the light propagating inside the light transmission / scattering layer 66D, thereby suppressing the propagation of light due to repeated reflection of light inside the transparent screen. Thereby, unnecessary light that does not contribute to the display of the image can be absorbed, and the contrast of the image can be improved.

(Resin film)
Next, details of the resin film 70 will be described. As the resin film 70, for example, a polycarbonate film, a polyethylene terephthalate film (PET film), a polyethylene naphthalate film (PEN film), a polyester film, or the like is used.

  FIG. 6 is a front view of the resin film inside the transparent screen of FIG. As shown in FIG. 1, the screen of the transparent screen 20 can be enlarged by arranging a plurality of screen sheets 50 in a plane. In this case, a plurality of resin films 70 are arranged along the main surfaces of the transparent plates 30 and 40 as shown in FIG. The plurality of resin films 70 arranged in a planar shape may be formed of either the same material or different materials, but is preferably formed of the same material. In FIG. 1, the plurality of resin films 70 arranged in a planar shape do not overlap, but may partially overlap.

(Transparent screen manufacturing method)
FIG. 7 is a flowchart of a method for manufacturing a transparent screen according to an embodiment. As shown in FIG. 7, the method for manufacturing the screen may include a low shrinkage treatment step S10 and an adhesion step S20. The main body that performs the low shrinkage treatment step S10 is the same as the main body that performs the bonding step S20 in FIG. 7, but may be different.

(Low shrinkage treatment process)
In the low shrinkage treatment step S10, each resin film 70 is subjected to low shrinkage treatment by heat treatment at 80 ° C to 200 ° C. The heat treatment time is, for example, 1 minute to 3 hours. The shrinkage of the resin film 70 due to the heat treatment in the bonding step S20 can be suppressed, and the seam expansion due to the shrinkage can be reduced. All the resin films 70 are subjected to a low shrinkage treatment.

  The resin film 70 subjected to the low shrinkage treatment may include a stretched film. Since the stretched film is significantly shrunk by heat treatment as compared with the unstretched film, the effect of performing the low shrinkage treatment step S10 before the bonding step S20 is significantly obtained.

  Although all of the plurality of resin films 70 arranged in a planar shape may be a stretched film, only a part may be a stretched film and the remaining may be an unstretched film.

  As the stretched film, for example, a biaxially stretched film or a longitudinally uniaxially stretched film is used. The biaxially stretched film is stretched in both the longitudinal direction (MD: Machine Direction) and the transverse direction (TD: Transverse Direction) while being conveyed in the longitudinal direction, and is formed into a strip shape. The longitudinally uniaxially stretched film is stretched in the longitudinal direction while being conveyed in the longitudinal direction, and is formed into a strip shape.

  When at least one of the plurality of adjacent resin films 70 is a biaxially stretched film or a longitudinally uniaxially stretched film, the lateral direction (vertical direction in FIG. 6) may be the direction in which the plurality of resin films 70 are arranged. Since the shrinkage rate in the horizontal direction is smaller than the shrinkage rate in the vertical direction (left-right direction in FIG. 6), the joints of the plurality of resin films 70 can be further reduced. This effect is also obtained when the resin film 70 is not subjected to low shrinkage treatment.

  The low shrinkage treatment step S10 may be performed before the adhesion step S20. The low shrinkage process may be performed on the resin film 70 in either a state where the video display layer 60 is attached or a state where the video display layer 60 is not yet attached.

(Adhesion process)
In the bonding step S20, the plurality of screen sheets 50 arranged in a planar shape and the transparent plates 30 and 40 are bonded by heat treatment. The bonding step S20 includes, for example, a lamination step, a deaeration step, a first heat treatment step, and a second heat treatment step.

  In the laminating step, for example, the transparent plate 30, the adhesive layer 31, a plurality of screen sheets 50 arranged in a planar shape, the adhesive layer 41, and the transparent plate 40 are stacked in this order to produce a laminate. In the degassing step, for example, the laminate is placed inside the vacuum bag, and the inside of the vacuum bag is degassed. In the first heat treatment step, the laminated body is heat-treated in an atmospheric furnace or the like together with the vacuum bag. In the second heat treatment step, after the first heat treatment step, the laminate taken out from the vacuum bag is subjected to pressure heat treatment with an autoclave or the like.

  In the first heat treatment step and the second heat treatment step, the laminate is compressed in the lamination direction. When a resin having a low glass transition temperature Tg is used as the resin for the adhesive layers 31 and 41, the resin is easily softened at a high temperature. Therefore, the softened resin is easily compressed and easily enters a joint. Therefore, intrusion of outside air from the end of the joint to the inside can be suppressed, and formation of bubbles can be suppressed. Examples of such resins include PVB (Poly-Vinyl Butyral, Tg: about 50 to 100 ° C.), EVA (Ethylene-Vinyl Acetate, Tg: about −45 to −25 ° C.), and the lower Tg. It is preferable for suppressing bubbles.

(First Modification of Manufacturing Method)
FIG. 8 is a flowchart of the transparent screen manufacturing method according to the first modification. FIG. 9 is an explanatory diagram of the tape fixing step shown in FIG. As shown in FIG. 8, the screen manufacturing method may include a low shrinkage treatment step S10, a tape fixing step S11, and an adhesion step S20.

  In the tape fixing step S11, the main surfaces of the plurality of adjacent resin films 70 are joined together with the transparent heat-resistant tape 80 as shown in FIG. 9 before the bonding step S20. The transparent heat-resistant tape 80 may be fixed from both main surfaces of the resin film 70 as shown in FIG. 9, or may be fixed only from one main surface. After the bonding step S20, the transparent heat-resistant tape 80 becomes a part of the transparent screen.

  The transparent heat resistant tape 80 has heat resistance against heat treatment in the bonding step S20. The transparent heat-resistant tape 80 can further suppress the shrinkage of the resin film 70 due to the heat treatment in the bonding step S20, and can further suppress the expansion of the seam due to the shrinkage.

  The tape fixing step S11 is performed after the low shrinkage treatment step S10 in FIG. 8, but may be performed before the low shrinkage treatment step S10.

  The transparent heat resistant tape 80 may be used when the resin film 70 is not subjected to a low shrinkage treatment. Also in this case, the transparent heat-resistant tape 80 can suppress the expansion of the seam.

(Second Modification of Manufacturing Method)
FIG. 10 is a flowchart of the transparent screen manufacturing method according to the second modification. FIG. 11 is an explanatory diagram of the filling step shown in FIG. As shown in FIG. 10, the method for manufacturing the screen may include a low shrinkage treatment step S10, a filling step S12, and an adhesion step S20.

  In the filling step S12, before the adhering step S20, as shown in FIG. 11, a liquid adhesive 82 is poured between the mutually facing end surfaces of the plurality of adjacent resin films 70 to be solidified. After the bonding step S20, the solidified adhesive 82 becomes a part of the transparent screen.

  The solidified adhesive 82 has heat resistance against heat treatment in the bonding step S20. The adhesive 82 after solidification can further suppress the shrinkage of the resin film 70 due to the heat treatment in the bonding step S20, and can further suppress the expansion of the seam due to the shrinkage.

  The filling step S12 is performed after the low shrinkage treatment step S10 in FIG. 10, but may be performed before the low shrinkage treatment step S10. The filling step S12 shown in FIG. 10 and the tape fixing step S11 shown in FIG. 8 may be performed in combination. In that case, either may be performed first, or both may be performed simultaneously.

  Note that the adhesive 82 may be used when the resin film 70 is not subjected to the low shrinkage treatment. Also in this case, the adhesive 82 can suppress the expansion of the seam.

  By the way, the mutually facing end surfaces of a plurality of adjacent resin films 70 are perpendicular to the main surface of the resin film 70 in FIGS. 1, 9, 11, etc., but as shown in FIG. It may be inclined with respect to the main surface of and may be overlapped. The expansion of the seam due to the shrinkage of the resin film 70 is hardly noticeable.

  As mentioned above, although embodiment of the manufacturing method of a transparent screen, etc. were described, this invention is not limited to the said embodiment etc., In the range of the summary of this invention described in the claim, various deformation | transformation and improvement Is possible.

  In the above embodiment and the like, the plurality of screen sheets 50 are arranged in a planar shape, but the present invention is not limited to this. For example, as shown in FIG. 13, the screen sheet 50 and the dummy sheet 72 may be arranged in a planar shape. The dummy sheet 72 has substantially the same thickness and substantially the same rigidity as the screen sheet 50, but unlike the screen sheet 50, the dummy sheet 72 does not have a function of displaying an image, and has only a function of visually recognizing the background. The dummy sheet 72 has a higher visible light transmittance than the screen sheet 50. By providing the dummy sheet 72 in the non-display area of the video, the visibility of the background in the non-display area of the video can be improved. As the dummy sheet 72, a resin film thicker than the resin film 70 constituting the screen sheet 50 is used. As the dummy sheet 72, a film similar to the resin film 70 is used. The dummy sheet 72 is subjected to a low shrinkage treatment similarly to the resin film 70.

  The transparent screen 20 may have only one of the plurality of transparent plates 30 and 40. In this case, the screen sheet 50 or the like is used by being attached to only one of the plurality of transparent plates 30 and 40.

  The transparent screen 20 may have both a reflective image display layer and a transmissive image display layer, and may display images projected from the front and rear to the user 10 in front. The reflective image display layer and the transmissive image display layer may be supported by the same resin film 70 or may be supported by different resin films 70.

  The transparent screen 20 may further have a functional layer (not shown). Examples of the functional layer include a light reflection preventing layer that reduces reflection of light, a light attenuation layer that attenuates part of light, and an infrared shielding layer that suppresses transmission of infrared light. Further, examples of the functional layer of the transparent screen 20 include a functional layer such as a vibration layer that functions as a speaker and a sound insulation layer that suppresses sound transmission. The number of functional layers and the position of the functional layers are not particularly limited.

DESCRIPTION OF SYMBOLS 10 User 12 Projector 20 Transparent screen 30 Transparent plate 40 Transparent plate 50 Screen sheet 60 Image display layer 60A Reflective image display layer 61A Uneven layer 62A Light transmission diffusion reflection layer 63A Cover layer 60B Reflection image display layer 62B Light transmission diffusion Reflective layer 60C Transmission type image display layer 66C Light transmission scattering layer 60D Transmission type image display layer 66D Light transmission scattering layer 70 Resin film 72 Dummy sheet 80 Transparent heat resistant tape 82 Adhesive

Claims (12)

A method of manufacturing a transparent screen that displays a projected image to a user in front and allows a user in front to visually recognize a back background,
The transparent screen includes a transparent plate, a plurality of resin films arranged along the main surface of the transparent plate, and an image display layer that is formed on at least one of the resin films and displays the image. And the transparent plate supports the plurality of resin films,
Having a bonding step of bonding a plurality of the resin films and the transparent plate by heat treatment;
Each of the resin films is a method for producing a transparent screen, which is subjected to a low shrinkage treatment by heat treatment at 80 ° C. to 200 ° C. before the bonding step.   The manufacturing method of the transparent screen of Claim 1 which further has the low shrinkage treatment process which performs the said low shrinkage process with respect to each said resin film before the said adhesion process.   The method for producing a transparent screen according to claim 1, wherein the resin film subjected to the low shrinkage treatment includes a stretched film.   The at least one of the plurality of adjacent resin films is a biaxially stretched film or a longitudinally uniaxially stretched film, and the horizontal direction is a direction in which the plurality of adjacent resin films are arranged. The manufacturing method of the transparent screen as described in a term.   The manufacturing method of the transparent screen of any one of Claims 1-4 which has further the tape fixing process which joins the main surfaces of several said adjacent resin films with a transparent heat-resistant tape before the said adhesion process. .   The transparent according to any one of claims 1 to 5, further comprising a filling step of pouring and solidifying a liquid adhesive between the mutually facing end surfaces of the plurality of adjacent resin films before the bonding step. Screen manufacturing method.   The production of a transparent screen according to any one of claims 1 to 6, wherein end surfaces facing each other of a plurality of adjacent resin films are formed obliquely with respect to the main surface of the resin film and overlapped. Method.   The method for manufacturing a transparent screen according to claim 1, wherein the transparent plate is a glass plate.   Each said resin film is a manufacturing method of the transparent screen of any one of Claims 1-8 arrange | positioned between the said some transparent plate.   The said image | video display layer includes the light transmissive diffuse reflection layer which displays the said image | video with respect to a front user by carrying out diffuse reflection of the light of the said image projected from the front ahead. 2. A method for producing a transparent screen according to item 1.   The said image | video display layer includes the light transmission scattering layer which displays the said image | video with respect to the front user by scattering the light of the said image | video projected from back forward. The manufacturing method of the transparent screen as described in any one of. The transparent screen has both the reflective video display layer and the transmissive video display layer,
The reflection-type image display layer includes a light transmission diffusion reflection layer that displays the image to a user in front by diffusing and reflecting the light of the image projected from the front.
The transmission type image display layer includes a light transmission / scattering layer that displays the image to a user in front by scattering the light of the image projected from the rear to the front. 2. A method for producing a transparent screen according to claim 1.