JP2016048357A - Method for manufacturing laminate constituting curved screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a laminate constituting a transmission type curved screen that has high durability against a high temperature high humidity environment in a long term and bubble inclusion is hard to be generated even in a bend part with a small curvature.SOLUTION: A method is provided for manufacturing a laminate 11 constituting a curved screen 10. The laminate 11 includes a support 12 having optical transparency and an optical sheet 14. The method for manufacturing the laminate 11 constituting the curved screen 10 is characterized by including: a step of preparing a support 12 having a curved portion so as to form a convex at least in one surface side and an optical sheet 14 having a curved shape like the support 12; a step of forming an adhesion layer 13 on one or more surfaces selected from the surface of the side with the optical sheet 14 of the support 12 stacked thereon or the surface of the side with the support 12 of the optical sheet 14 stacked thereon; and a step of laminating the optical sheet 14 and the support 12 through the adhesion layer 13.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method of manufacturing a laminated body that forms a curved screen having a curved display surface, and in particular, is formed so as to form a three-dimensional curved surface and transmits image light projected from one surface side to the other surface side. The present invention relates to a manufacturing method suitable for manufacturing a laminated body constituting a transmissive curved surface screen.

  As one of display devices that display video and images, there is a rear projection display device. This rear projection display device is also referred to as a rear projection display device, and is a display device that projects image light from an image light source on the back side of a transmissive screen and emits an image on the front side (observer side) of the screen. . The transmissive screen included in the rear projection display device is equipped with a Fresnel lens sheet, a light diffusion layer, etc. so that the viewer can observe the image light from the image light source as an appropriate and high quality image when it is emitted to the front side. It has been.

  Patent Document 1 describes a transmissive screen in which an optical sheet is bonded to a flat high-rigidity substrate layer (glass, translucent ceramic).

  In addition, a curved screen with a curved display surface of an image is desired from a design viewpoint mainly for in-vehicle use. Japanese Patent Application Laid-Open No. H10-260260 discloses a technique that provides an excellent appearance when such a transmission screen has a three-dimensional curved surface. Thereby, for example, a transmissive screen can be formed with a curved surface along the curve of the console portion of the automobile, and a sense of unity between the display device and the interior of the automobile can be produced.

  Further, Patent Document 3 discloses a laminate having a curved portion that is convex so as to be convex on one side for the purpose of providing a curved screen having a laminate in which an optical sheet is firmly attached to a support. The laminate includes a support having optical transparency and an optical sheet, and includes an adhesive composition including a heat sealant between the optical sheet and the support. A curved screen is described, provided with a layer.

JP 2006-195013 A JP 2012-159646 A Japanese Patent Application No. 2013-207507

  The transmission type screen has a laminated structure in which a plurality of members such as an optical sheet provided with a light diffusion layer and the like are laminated on a support for maintaining the shape. As described in Patent Document 1, when the transmission screen is flat, it is easy to produce such a laminate.

  However, when a laminate having a curved display surface is produced, particularly when high durability against a high-temperature and high-humidity environment typified by in-vehicle applications is required, the creation of a curved screen is difficult. . For example, in the invention described in Patent Document 2, an optical sheet is preformed and a resin is injection molded. Therefore, it is limited to resin materials that do not damage the optical sheet at the time of molding, and cannot be applied to glass or ceramic materials that can provide high durability.

  Further, in the invention described in Patent Document 3, when the support having a curved portion and the optical sheet are bonded through an adhesive layer containing an adhesive composition containing a heat sealant, the optical sheet is softened. Heating at the above temperature is performed while softening and deforming. In such a manufacturing method, bonding is performed while the optical sheet is instantaneously deformed (along the curved glass), so that a large residual stress remains in the optical sheet. Therefore, there arises a problem that peeling occurs at the end portion during long-term use. In addition, there is a problem in that a bubble biting is likely to occur at a bent portion having a small curvature.

  The problem to be solved by the present invention is a method for producing a laminated body that constitutes a transmissive curved screen that has high durability in a high temperature and high humidity environment for a long period of time and is less likely to cause foam biting even in a bent portion with a small curvature. It is to provide. It should be noted that the bubble biting is a phenomenon in which a gas such as air is mixed into a layer or member and is not in a uniform state, and this is a phenomenon that causes a visual appearance defect in the gas mixed portion and causes a decrease in adhesive strength. is there.

  The present invention solves the above problems by the following means. For ease of understanding, reference numerals corresponding to the embodiments of the present invention are given and described, but the present invention is not limited to these.

  The invention of claim 1 is a method of manufacturing a laminate 11 comprising a curved screen 10 having a laminate 11 having a curved portion so as to be convex toward at least one surface, wherein the laminate 11 , A support 12 having optical transparency, and an optical sheet 14, the support 12 having a curved portion so as to be convex on at least one surface side, and the same curvature as the support 12. The optical sheet 14 having a shape is prepared, and the surface of the support 12 on the side on which the optical sheet 14 is superimposed, or the surface of the optical sheet 14 on the side on which the support 12 is superimposed is selected. Forming an adhesive layer 13 between the support 12 and the optical sheet 14 on one or more surfaces; and connecting the optical sheet 14 and the support 12 to each other between the support 12 and the optical sheet 14. Characterized in that it comprises a step of bonding through a layer 13, and a method for producing a laminate 11 forming the curved screen 10.

  In addition, according to a second aspect of the present invention, the adhesive layer 13 of the support 12 and the optical sheet 14 includes a heat sealant, and the optical sheet 14 and the support 12 are connected to the support 12 and the optical sheet. 14. The method of manufacturing the laminate 11 constituting the curved screen 10 according to claim 1, wherein the step of bonding via the adhesive layer 13 is a thermocompression bonding step.

  In addition, according to a third aspect of the present invention, the optical sheet 14 is a molding jig of the same type as the mold used for forming the support 12 having a curved portion so as to be convex on at least one surface side. 3. The manufacturing of the laminate 11 constituting the curved screen 10 according to claim 1, wherein a curved shape similar to that of the support 12 is obtained by performing a vacuum forming process using 103. Is the method.

In addition, according to a fourth aspect of the present invention, the step of bonding the optical sheet 14 and the support body 12 through the adhesive layer 13 of the support body 12 and the optical sheet 14 includes the lower container 210 and the upper side. Using the vacuum laminating apparatus 200 provided with the container 220, the support 12 is placed on the bonding jig 201 in the container 210 on the lower side of the vacuum laminating apparatus 200, and the optical sheet 14 is placed at a predetermined position. Placing the rubber sheet 203 on the upper side of the lower container 210 of the vacuum laminating apparatus 200, pushing up the bottom of the lower container 210 of the vacuum laminating apparatus 200 and in the upper container 220 Is set to normal pressure or pressurization, through the rubber sheet 203, the lower container 210 and the upper container 220 4. The method of manufacturing the laminate 11 constituting the curved screen 10 according to claim 1, comprising a step of bonding the optical sheet 14 to the support 12 by differential pressure. 5. .

  By the production method according to the present invention, it is possible to produce a laminate 11 that constitutes a transmissive curved screen that has high durability against a high temperature and high humidity environment for a long period of time and is less likely to cause foam biting even at a bent portion with a small curvature. it can.

FIG. 1 is a diagram conceptually showing the internal structure of the rear projection display device 1. FIG. 2 is a perspective view of the curved screen 10. FIG. 3 is a vertical sectional view for explaining an example of the layer structure of the curved screen 10, and this sectional view is an example of a partially enlarged view of the AA section of FIG. FIG. 4 is a front view of the curved screen 10 for explaining the Fresnel lens portion 23. FIG. 5 is a block diagram for explaining a method for manufacturing the laminate 11 constituting the curved screen 10 of the present embodiment. FIG. 5A is a block diagram when the adhesive layer 13 of the support 12 and the optical sheet 14 is formed on the surface of the optical sheet 14 on the side where the support 12 is overlapped. FIG. 5B is a block diagram when the adhesive layer 13 of the support 12 and the optical sheet 14 is formed on the surface of the support 12 on the side where the optical sheet 14 is overlapped. FIG. 6 is a conceptual diagram of a vacuum forming process showing an example of a process of making the optical sheet 14 a curved shape similar to that of the support 12, a part of the manufacturing process of the laminated body 11 constituting the curved screen 10. 6A shows the heating process, FIG. 6B shows the support process for the optical sheet 14, FIG. 6C shows the vacuum forming process, and FIG. 6D shows the cooling process. FIG. 6E is a diagram for explaining the process of peeling the optical sheet 14, and FIG. 6F is a diagram for explaining the trimming process of the optical sheet 14. FIG. 7 is a conceptual diagram illustrating another part of the manufacturing process of the laminate 11 constituting the curved screen 10, in particular, part of the process of bonding the optical sheet 14 and the support 12. FIG. 8 is a conceptual diagram illustrating still another part of the manufacturing process of the laminated body 11 constituting the curved screen 10, in particular, another part of the process of bonding the optical sheet 14 and the support 12. FIG. 9 is a conceptual diagram illustrating still another part of the manufacturing process of the laminated body 11 constituting the curved screen 10, particularly still another part of the process of bonding the optical sheet 14 and the support 12.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications within the scope of the object of the present invention. Note that the drawings are conceptual diagrams, and the scale relations, aspect ratios, and the like of components may be exaggerated as appropriate for convenience of explanation.

  In this embodiment, for convenience, the X-axis direction shown in the drawing is the left-right direction (especially the arrow direction is right), the Y-axis direction is vertical (particularly the arrow direction is upward), and the Z-axis direction is front-back (particularly the arrow direction). Will be called later). Using the curved screen 10 as a reference, the arrow direction of the Z axis is referred to as the image source side or the back side, and the direction opposite to the arrow direction of the Z axis is referred to as the observer side.

  Further, the front view corresponds to the plane direction when the surface parallel to the XY plane or the sheet-like curved screen 10 is viewed as a whole and globally from the image source side (observer side). It is a drawing obtained when observing a plane (a plane parallel to the XY plane), in other words, a drawing showing a shape seen from the normal direction (Z-axis direction) raised on the curved screen 10 parallel to the XY plane. is there.

  FIG. 1 is a diagram for explaining one embodiment, and is a diagram conceptually showing a part of the internal structure of a rear projection display device 1 (hereinafter sometimes referred to as “display device 1”). .

  The display device 1 has a curved screen 10, and the video light I emitted from the video light source 3 is provided to the viewer side through the curved screen 10. For example, the display device 1 is built in a dashboard portion of an automobile, and the viewer side surface of the curved screen 10 is disposed so as to be exposed in the vehicle, and provides an image to the observer. As can be seen from FIG. 1, the display device 1 includes a housing 2, an image light source 3, and a curved screen 10. In addition, although illustration is omitted, the display device 1 includes various components for functioning as a display device.

  The housing 2 is a member that forms an outer shell of the display device 1 and that accommodates most of the members constituting the display device 1 therein. The housing 2 has an opening that can support the curved screen 10, and the curved screen 10 is fitted into the opening.

  The image light source 3 is disposed in the housing 2 and irradiates the image light on almost the entire light incident surface of the curved screen 10 as divergent light in which the irradiation area gradually expands. As such an image light source 3, a conventionally known light source, for example, a single tube type light source using DMD can be used. In the present embodiment, the image light source 3 is disposed below the center of the curved screen 10 on the back side (the side opposite to the observer side) of the curved screen 10. Here, the light incident surface of the curved screen 10 means a surface of the curved screen 10 on the side where the image light source 3 is disposed. On the other hand, the light exit surface of the curved screen 10 means a surface directed toward the observer side.

[Curved surface]
Next, the curved screen 10 will be described. FIG. 2 is a perspective view of the curved screen 10, and FIG. 3 is an enlarged cross-sectional view of a portion of the thickness direction cross section of the curved screen 10 in the vertical direction along the line AA in FIG. FIG. 3 is a diagram schematically illustrating an example of a layer configuration of the curved screen according to the present embodiment. As can be seen from FIGS. 1 to 3, the curved screen 10 has a plate shape as a whole, but is formed in a convex curved surface whose center protrudes toward the viewer. Accordingly, it is possible to provide a screen having an excellent appearance and a display device including the screen.

  FIG. 1 to FIG. 3 illustrate a curved screen 10 having a curved surface whose central portion is convex toward the viewer. However, the position and number of protrusions are not particularly limited. Further, the convex direction is not limited, and may be convex toward the image light source side (back side) (that is, concave when viewed from the observer side). Further, the direction of the unevenness may be changed depending on the part by one curved screen.

  The curved screen 10 is a transmissive screen that transmits image light incident from the light incident surface side (image light source side) to the light exit surface side (observer side). The curved screen 10 includes a laminate 11 as can be seen from FIG. Furthermore, it is preferable to provide the Fresnel lens sheet 21 and the like for the purpose of controlling the direction of the image light incident on the light incident surface side (image light source side) with high efficiency.

  The laminated body 11 constituting the curved screen 10 has a curved portion so as to be convex on one surface side. As can be seen from FIG. 3, the laminate 11 has a structure in which a plurality of layers are laminated. From the light exit surface side (observer side), the support 12 and the adhesive layer 13 between the support and the optical sheet are provided. And an optical sheet 14. Furthermore, the optical sheet 14 may be configured by a single layer having a function of controlling the direction of image light, such as the light diffusion layer 15 and the louver layer 20, or a combination thereof. This will be described in detail below.

<Support>
The support 12 is a plate-like member having translucency. The support 12 is a sheet-like member that imparts a predetermined stiffness to the laminate 11 in order to give sufficient strength to maintain the shape of the curved screen 10, and has translucency and imparts the stiffness. It is made of a material that can Such a material is not particularly limited, and glass, resins such as methyl methacrylate / butadiene / styrene copolymer (MBS), acrylic, polycarbonate, and the like can be used. In particular, the use of glass is preferable in that high durability against high temperature and high humidity environment over a long period of time is maintained.

<Adhesive layer of support and optical sheet>
The adhesive layer 13 of the support and the optical sheet is a layer formed by an adhesive composition having a function of fixing both the optical sheet 14 and the support 12. The composition is not particularly limited as long as it is a composition having an adhesive function or an adhesive function. The adhesive layer 13 between the support and the optical sheet can be formed with an appropriate thickness, and the thermo-compression adhesive containing the heat sealant is less likely to cause floating or bubble biting between the optical sheet 14 and the support 12. Compositions are preferred. Furthermore, the adhesive layer 13 of a support body and an optical sheet can use a curable adhesive composition for the purpose of maintaining high durability against a high temperature and high humidity environment over a long period of time. As will be described later, when the support 12 and the optical sheet 14 are bonded together, both are curved. Thus, when bonding what was curved, after applying adhesive composition, it is preferable that the adhesive composition is in the state solidified until it bonds. Further, when a curable adhesive composition is used, it is preferably made of a thermosetting or ultraviolet curable adhesive composition from the viewpoint of compatibility with the bonding process.

  Examples of the adhesive composition containing the heat sealant used for the adhesive layer 13 of the support and the optical sheet include urethane resins such as urethane acrylate. Examples of generally available products include Tyforce (registered trademark) manufactured by DIC Corporation and Arrow Base (registered trademark) manufactured by Unitika Corporation.

  As a method of forming the support and the adhesive layer 13 of the optical sheet with the adhesive composition containing such a heat sealant, an adhesive composition containing a heat sealant diluted with a solvent is used as a support having a curved shape. 12 or the optical sheet 14 is spray-coated at a dry film thickness of 5 μm or more and 30 μm or less in a dry film thickness, and is hot-pressed after drying with hot air at a temperature below the glass transition point of the support 12 and the optical sheet 14. realizable.

  In the laminate 11 constituting the curved screen 10 of the present embodiment, the support 12 and the optical sheet 14 are strengthened by using an adhesive composition containing a heat sealant for the support and the adhesive layer 13 of the optical sheet. The durability against high temperature and high humidity can be improved.

<Optical sheet>
Next, the optical sheet 14 will be described. The form (layer configuration) of the optical sheet 14 bonded to the support 12 formed of the adhesive composition containing the heat sealant and the curved support 12 via the adhesive layer 13 of the optical sheet is not particularly limited. The optical sheet 14 illustrated in 3 includes a light diffusion layer 15, an adhesive layer 16 in the optical sheet, a louver layer 20, and a louver base material 25 from the light exit surface side (observer side).

When the thickness of both the light diffusion layer 15 and the louver layer 20 is thin and wrinkles occur during the process of bonding the optical sheet 14 and the support 12, the thickness is about 0.5 mm. A substrate having rigidity such as a polycarbonate substrate may be bonded to form a support plate. The layer structure of the optical sheet 14 at that time may be, for example, polycarbonate substrate / ultraviolet curable adhesive layer / light diffusion layer / ultraviolet curable adhesive layer / louver layer 20 / louver substrate 25.
These layers are described below.

<Light diffusion layer>
The light diffusion layer 15 is a layer having a function of diffusing transmitted light. Specifically, the light diffusion layer 15 has a base portion made of a transparent resin and a diffusion component dispersed in the base portion. The light diffusion layer 15 can diffuse light due to the difference in refractive index between the base portion and the diffusion component or due to the reflectivity of the diffusion component itself. With this function of the light diffusion layer 15, the image light is diffused and a predetermined viewing angle can be obtained.

  As the transparent resin forming the base portion of the light diffusion layer 15, for example, methyl methacrylate / butadiene / styrene copolymer (MBS), acrylic resin, polycarbonate resin, or the like can be used. On the other hand, as the diffusing component, organic fillers such as plastic beads are preferable, and those having high transparency are particularly preferable. Examples of the plastic beads include melamine beads, acrylic beads, acrylic-styrene beads, polycarbonate beads, polyethylene beads, polystyrene beads, and vinyl chloride beads. Among these, acrylic beads are preferable. In addition, the diffusion component can be composed of bubbles.

  The thickness of the light diffusion layer 15 is preferably from 0.1 mm to 2.0 mm, and more preferably from 0.2 mm to 1.5 mm. When the thickness of the light diffusion layer 15 is less than 0.1 mm, there is a possibility that the light diffusion effect cannot be obtained sufficiently. On the other hand, if the thickness of the light diffusion layer 15 exceeds 2.0 mm, the image may be blurred.

<Adhesive layer in optical sheet>
The adhesive layer 16 in the optical sheet is a layer containing an adhesive for bonding the optical function layer 17 and the light diffusion layer 15 together. The material used for the adhesive layer 16 in the optical sheet is not particularly limited as long as it transmits light and the optical functional layer 17 can be bonded to another. For the adhesive layer 16 in the optical sheet, for example, an ultraviolet curable resin can be used. The ultraviolet curable resin has an advantage that it has excellent adhesive strength and is easy to handle. However, as the adhesive layer 16 in the optical sheet, it is also possible to use an adhesive composition containing a heat sealant, like the support and the adhesive layer 13 of the optical sheet.

<Optical function layer>
The optical function layer 17 has a function of changing the traveling direction of the image light by transmitting the image light and refracting the image light so that the observer can appropriately observe, and absorbing at least a part of the unnecessary light. Have. In the present embodiment, the optical functional layer includes a louver layer 20 having a function of absorbing at least a part of unnecessary light, and a Fresnel lens sheet 21 that refracts video light so that an observer can appropriately observe it. It has become.

<Louvre layer>
The louver layer 20 is laminated on the observer side of the louver base material 25, and a plurality of light transmission parts 18 arranged in parallel so as to transmit light along one surface (screen surface) of the louver base material 25. And a plurality of light absorbing portions 19 arranged in parallel between two adjacent light transmitting portions 18. And in this embodiment, the light transmission part 18 and the light absorption part 19 have the cross section shown in FIG. 3, are extended in one direction (this embodiment horizontal direction), and are different from the said extension direction (in this embodiment). A plurality of light transmission portions 18 and light absorption portions 19 are alternately arranged in the vertical direction).

  The light transmission part 18 is a part having a function of transmitting image light, and is an element having a substantially trapezoidal cross section in the cross section shown in FIG. The upper base in the substantially trapezoidal cross section is arranged on the viewer side, and the lower base longer than the upper base is arranged on the Fresnel lens sheet 21 side. In this embodiment, the lower bottom side (Fresnel lens sheet 21 side) of the adjacent light transmission portions 18 is connected.

The light transmission part 18 is formed of a material having light transparency. Such a material is not particularly limited. For example, a transparent resin mainly composed of one or more of acrylic, styrene, polycarbonate, polyethylene terephthalate, acrylonitrile, etc., and an epoxy acrylate or urethane acrylate reactive resin. (Ionizing radiation curable resin or the like) can be used. Here, the refractive index of the light transmitting portion 18 is not particularly limited, but is preferably 1.49 to 1.56 from the viewpoint of availability of a material to be applied.

  The light absorbing portion 19 is a portion having a function of absorbing light formed between the adjacent light transmitting portions 18 and has a substantially trapezoidal shape in this embodiment. The light absorbing portion 19 contains a material that absorbs light, and the upper base in the substantially trapezoidal cross section is directed to the Fresnel lens sheet 21 side, and the lower base longer than the upper base is directed to the viewer side, which is the opposite side. ing. Here, it is preferable that the hypotenuse (leg part) in the substantially trapezoidal cross section of the light absorption part 19 forms an angle of 0 degree or more and 10 degrees or less with respect to the height direction of the light absorption part 19. In the present embodiment, the light absorbing portion 19 has an example of a substantially trapezoidal cross section, but is not limited thereto, and may be a square, a rectangle, or a parallelogram. In addition, the slope of the hypotenuse does not necessarily have to be constant, and may be a polygonal line that changes depending on the position of the curved screen 10 in the thickness direction, or may be a curved line. Further, the length of the upper base of the light absorbing portion 19 can be reduced to make the cross section substantially triangular.

  Such a light absorption part 19 can be formed, for example, by containing a light-absorbing material in a transparent resin. As the transparent resin, for example, an ionizing radiation curable resin can be used, and is not particularly limited. However, for example, urethane acrylate type, epoxy acrylate type, etc. having characteristics of being cured by ionizing radiation such as electron beam and ultraviolet ray. An acrylate resin can be used.

  On the other hand, the light-absorbing material only needs to have a function of absorbing unnecessary light such as stray light and external light that is visible light, such as carbon black, graphite, metal salts such as black iron oxide, pigments, Mention may be made of dyes.

  Moreover, when it has a function which detects the contact to the curved screen 10 by infrared rays, it is preferable that infrared light permeate | transmits the curved screen 10 efficiently. Therefore, at this time, it is preferable that the light-absorbing material absorbs visible light while transmitting infrared light. As a light absorber capable of transmitting infrared light, a light absorber made of ink mixed with a pigment or dye can be used. Examples of the pigment include perylene black pigment, aniline black pigment, format black (mixed pigment of yellow, magenta and cyan pigment), phthalocyanine blue, brilliant carmine and the like. Furthermore, when the light absorber is resin particles colored with pigments or dyes, specific examples of the resin particles include plastic beads such as melamine beads, acrylic beads, acrylic-styrene beads, polycarbonate beads, polyethylene beads, polystyrene beads, and the like. Among them, acrylic beads are preferably used among these.

  A sheet provided with the louver layer 20 is manufactured as follows, for example. First, the light transmission portion 18 is formed on the louver base material 25. In order to form the light transmission part 18, a mold roll having a surface shape corresponding to the shape of the light transmission part 18 is prepared. Next, the louver base material 25 is fed between the mold roll and the nip roll. In accordance with the feeding of the louver base material 25, droplets of the composition constituting the light transmission portion 18 are continuously supplied between the mold roll and the louver base material 25. When the composition is supplied onto the louver base material 25, a bank in which the composition is accumulated is formed between the mold roll and the louver base material 25. In this bank, the composition spreads in the width direction of the substrate.

  The composition supplied between the mold roll and the louver base 25 as described above is filled between the louver base 25 and the mold roll by the pressing force between the mold roll and the nip roll. Is done. Thereafter, the light transmissive part 18 can be formed by irradiating the composition with ultraviolet rays or the like with a light irradiation device and curing the composition. After the light transmission part 18 is formed, the sheet on which the light transmission part 18 is formed on the louver base material 25 is peeled off from the mold roll. Then, it is cut into a predetermined size. Thereby, the louver base material 25 on which the louver layer 20 is laminated is obtained.

  The composition constituting the light absorbing portion 19 before being cured is excessively supplied to the louver base material 25 on which the louver layer 20 obtained as described above is laminated, so that the composition is pressed with a blade and scraped off. Move to. As a result, the excess composition is removed and the composition is filled between the adjacent light transmission portions 18. Thereafter, the composition is cured by an appropriate method. Thereby, the light absorption part 19 is formed between the light transmission parts 18. Thus, a sheet in which the louver layer 20 is laminated on the louver base material 25 is obtained.

  Next, the Fresnel lens sheet 21 will be described. In the present embodiment, the Fresnel lens sheet 21 is preferably disposed on the light incident surface side of the multilayer body 11 and curved so as to be convex in the same direction as the multilayer body 11. The Fresnel lens sheet 21 includes a Fresnel lens substrate 22 and a Fresnel lens portion 23 formed on the surface of the Fresnel lens substrate 22. FIG. 4 schematically shows the curved screen 10 viewed from the observer side in order to explain the Fresnel lens portion 23.

  The Fresnel lens substrate 22 is a portion that serves as a base for forming the Fresnel lens portion 23. Accordingly, the Fresnel lens base material 22 has translucency and is configured to have such strength that the Fresnel lens portion 23 can be formed and held. Specific examples of the material constituting the Fresnel lens substrate 22 include films of polycarbonate, cycloolefin, TAC (TRIACETYLCELLULOSE), and the like. Among these, polycarbonate is preferable from the viewpoint of availability and cost. The polycarbonate here is one having polycarbonate as a main polymer, and may contain, for example, a deterioration inhibitor, a plasticizer, a filler such as softening, or a composite with a methacrylic resin or the like.

  The thickness of the Fresnel lens substrate 22 (the thickness of the Fresnel lens sheet 21 excluding the Fresnel lens portion 23. That is, the thickness of the thinnest part of the Fresnel lens sheet 21) is 1 mm or more and 2 mm or less. Is preferred. By setting the thickness of the Fresnel lens substrate 22 to 1 mm or more, it becomes easy to impart sufficient rigidity to the Fresnel lens sheet 21. On the other hand, by setting the thickness of the Fresnel lens substrate 22 to 2 mm or less, the curved screen 10 becomes too thick, the transmittance of the image light is reduced, a ghost (double image) is generated, and the like. This makes it easier to prevent problems.

  The Fresnel lens unit 23 has a function of changing the traveling direction of the image light projected from the image light source 3 onto the curved screen 10 as a divergent light beam. Specifically, the Fresnel lens unit 23 advances the image light incident as a divergent light beam in a substantially parallel light beam that travels from the image light incident side toward the image light emission side, for example, in a front direction substantially perpendicular to the screen surface. It is converted into a substantially parallel light beam. In this way, by using the Fresnel lens portion 23 to once convert the image light into a parallel light flux, it is possible to effectively reduce the inner surface variation in the brightness of the image observed by the observer, in particular, the image observed by the observer from an oblique direction. Can be relaxed.

  As can be seen from FIG. 4, the Fresnel lens portion 23 of the present embodiment is a so-called circular Fresnel lens. FIG. 4 is a front view of the curved screen 10 for explaining the Fresnel lens portion 23. Therefore, the longitudinal direction of each of the plurality of unit lenses 24 extends in an arc shape having a predetermined radius, and is arranged so as to form a concentric circle with the adjacent unit lenses 24. As the cross-sectional shape of each unit lens 24, a publicly known one can be used according to the purpose.

  In the present embodiment, the unit lens 24 is symmetrical with respect to the vertical direction line A passing through the center position in the horizontal direction in the horizontal direction. On the other hand, in the vertical direction, the concentric optical center C where the unit lenses 24 are arranged is below the curved screen 10 on the vertical direction line A. Thus, even if image light is projected from below the curved screen 10 by decentering the optical center C from the geometric center of the screen of the Fresnel lens portion 23 in the vertical direction, the divergent light beam from the image light source 3 is reflected. A substantially parallel light beam that is substantially perpendicular to the screen surface can be efficiently obtained. Moreover, the image light source 3 can be brought closer to the observer side by the configuration in which the image light is irradiated from below the curved screen as described above, and the display device 1 can be made thin.

  However, the present invention is not limited to this, and a circular Fresnel lens in which the optical center C of a concentric circle in which the unit lenses 24 are arranged exists in the Fresnel lens portion, or the unit lens extends horizontally or vertically linearly, and the extending direction. This does not prevent the application of a linear Fresnel lens in which a plurality of unit lenses are arranged in different directions.

As resin which comprises the Fresnel lens part 23, transparent resins, such as an acrylic resin, a styrene resin, a polyester resin, a polycarbonate resin, an acryl-styrene copolymer resin, can be mentioned. Further, when the size of the curved screen 10 is large, epoxy acrylate or urethane acrylate type reactive resin (ionizing radiation curable resin or the like) can be used from the viewpoint of moldability.

  The Fresnel lens substrate 22 is a substrate for forming the Fresnel lens sheet 21. The main component of the material constituting the Fresnel lens substrate 22 is not particularly limited as long as it has translucency. The “main component” means a component that is contained in an amount of 50% by mass or more based on the entire material constituting the substrate (the same applies hereinafter). Examples of the main component of the material constituting the Fresnel lens substrate 22 include polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, terephthalic acid-isophthalic acid-ethylene glycol copolymer, terephthalic acid-cyclohexanedimethanol. -Polyester resins such as ethylene glycol copolymer, polyamide resins such as nylon 6, polyolefin resins such as polypropylene and polymethylpentene, acrylic resins such as polymethyl methacrylate, polystyrene, styrene-acrylonitrile copolymer, etc. Examples thereof include styrene resins, cellulose resins such as triacetyl cellulose, imide resins, and polycarbonate resins. Among these, polycarbonate resin is preferable from the viewpoints of availability, cost, adhesion with ionizing radiation curable resin, and the like. In addition to the main components, other resins and various additives may be appropriately added to the resin constituting the Fresnel lens substrate 22. Examples of general additives include phenol-based antioxidants, lactone-based stabilizers, and the like. Moreover, you may add well-known additives, such as a ultraviolet absorber, a filler, a plasticizer, an antistatic agent, in these resins suitably as needed.

  The Fresnel lens sheet 21 can be produced by a known method. That is, a material before curing that should become the Fresnel lens portion 23 is filled between the sheet-like member serving as the Fresnel lens substrate 22 and a mold having an uneven shape capable of forming the Fresnel lens portion 23. And the material before the said hardening is hardened using a suitable hardening means. Thereby, a Fresnel lens sheet can be obtained.

  The optical function layer 17 may be the louver layer 20 alone. Moreover, it can also form by combining what formed the Fresnel lens sheet 21 and the louver layer 20 on another base material, respectively. In this embodiment, after the support body 12 and the optical sheet 14 are bonded together to form the laminated body 11, the curved screen 10 is formed by combining the Fresnel lens sheet 21 having the same curved shape as the laminated body 11, As a result, the louver layer 20 and the Fresnel lens sheet 21 constituting the laminated body 11 interact with each other to exhibit an excellent function as the optical function layer 17.

  According to the display device 1 including the optical sheet 14 described above, for example, image light can be provided to an observer as follows. This will be described with an example of the optical path. However, the optical path examples shown here are conceptual and do not strictly represent reflection angles, refraction angles, or the like.

  As shown in FIG. 1, the image light L <b> 1 emitted from the image light source 3 reaches the light incident surface side of the curved screen 10. The image light reaching the light incident surface side of the curved screen 10 in this way is applied to the screen surface by the action of the Fresnel lens portion 23 of the Fresnel lens sheet 21 as indicated by image light L31 and L32 in FIG. The light is refracted so as to be substantially vertical and substantially parallel to the viewer side (front direction).

  The image light deflected in the Fresnel lens sheet 21 is transmitted through the light transmission part 18, the adhesive layer 16 in the optical sheet, the light diffusion layer 15, the adhesive layer 13 of the support and the optical sheet, and the support 12, and the observer. Emitted to the side.

On the other hand, at least a part of the external light (light from sunlight, room light, etc.) incident on the curved screen 10 from obliquely above from the observer side is absorbed by the light absorbing portion 19 and is not reflected to the observer side. Therefore, the contrast of the image displayed on the curved screen 10 can be improved.

  In the description so far, the louver layer 20 provided with the light transmitting portion 18 and the light absorbing portion 19 has been described by exemplifying a form that plays a part of the role as the optical functional layer 17, but the layer configuration of the optical sheet 14 is There is no particular limitation. Therefore, instead of the louver layer 20, a bead sheet layer in which beads are spread may be used, a layer having a lenticular lens may be used, or other layers may be added. Various known functional layers such as a hard coat layer may be provided on the surface of the support (the surface on the observer side).

  In the description so far, the embodiment in which the Fresnel lens sheet 21 is provided has been described as an example. However, when the projection distance of the image light source is long, when the display surface of the curved screen 10 is small, when cost is prioritized over performance When the lenticular lens and the Fresnel lens are assumed to be rubbed or crushed, the Fresnel lens sheet 21 may not be used.

  Next, the manufacturing method of the laminated body 11 which comprises the curved screen 10 is demonstrated. As shown in FIG. 5, the method of manufacturing the laminate 11 constituting the curved screen 10 includes an optical sheet 14 having a curved portion so as to be convex on at least one surface side, and at least one surface side. A step (first step) of preparing a support body 12 having a curved portion so as to be convex, and a surface of the support body 12 on which the optical sheet 14 is overlaid, or the support body 12 of the optical sheet 14 is overlaid. A step of forming an adhesive layer 13 of the support and the optical sheet on one or more surfaces selected from the surfaces to be formed (second step), and bonding the optical sheet 14 and the support 12 to the support and the optical sheet. And a step (third step) of bonding through the layers. Hereinafter, the manufacturing method of the laminated body 11 which comprises the curved screen 10 is demonstrated, referring FIG. 5 thru | or FIG.

  FIG. 5 is a schematic block diagram showing a method for manufacturing the laminate 11 constituting the curved screen 10. Here, (a) shows the case where the support and the optical sheet adhesive layer 13 are provided on the optical sheet 14 side, and (b) shows the case where the support and the optical sheet adhesive layer 13 are provided on the support 12 side. showed that. Although not shown in the block diagram, an adhesive layer 13 between the support 12 and the optical sheet 14 may be provided on both the support 12 and the optical sheet 14.

(First step-1-2)
The first steps -1 and 2 are steps for preparing an optical sheet 14 having a curved portion so as to be convex on one surface side.

(First step-1)
The first step-1 described in FIG. 5 is a step of preparing the optical sheet 14 before providing the curved portion. As described above, the manufacturing method of the optical sheet 14 is not particularly limited, and a known method can be applied.

(First step-2)
Moreover, the 1st process-2 described in FIG. 5 is the same as the support body 12 produced at the 1st process-3 on the flat optical sheet 14 before providing the curved part prepared by the 1st process-1. This is a step of providing a curvature. As an example, the optical sheet 14 prepared in the first step-1 is provided with a conceptual diagram of the step of providing the same curvature as that of the support 12 with a vacuum forming machine, that is, the step of vacuum forming processing, along FIG. The process of providing the same curvature as the support 12 produced on the flat optical sheet 14 prepared in the first process-1 will be described.

  The flat optical sheet 14 prepared in the first step-1 before providing the curved portion is fixed by the fixing device 102 as shown in FIG. 6A, and then the heating device 101 of the vacuum forming machine. Thus, the optical sheet 14 is heated to a temperature at which the optical sheet 14 can be deformed at a temperature equal to or higher than the softening point of the optical sheet 14.

  Next, the optical sheet 14 is placed on a forming jig 103 (in the illustrated form, having a curved portion that protrudes downward) placed in a vacuum forming machine, and the optical softened as described above. The sheet 14 is disposed at a predetermined position.

  At this time, the forming jig 103 installed in the vacuum forming machine may be prepared exclusively for forming the optical sheet 14 so as to form a curve similar to that of the support 12. A mold or the like used for providing a curve may be used as the forming jig 103.

  Further, as illustrated in FIG. 6C, when the optical sheet 14 is fixed in the vacuum forming machine by the fixing device 102, the upper part than the optical sheet 14 and the lower part than the optical sheet 14 are It has a structure that can be airtight independently, and has a structure in which the lower part than the optical sheet 14 can be decompressed by releasing the vacuum valve 104. By releasing the vacuum valve 104, the softened optical sheet 14 is pressed against the forming jig 103 by the differential pressure generated between the upper part of the optical sheet 14 and the lower part of the optical sheet 14 in the vacuum forming machine. Then, it is deformed into a shape defined by the forming jig 103.

  Next, as illustrated in FIG. 6D, the softened optical sheet 14 is pressed against the molding jig 103 and is deformed into a shape defined by the molding jig 103. By cooling at, the optical sheet 14 maintains the same curvature as the support 12.

  As shown in FIG. 6E, after cooling to the glass transition point of the optical sheet 14 or less, the optical sheet 14 is released from the molding jig 103 to have the same curved shape as the support. The optical sheet 14 can be obtained.

  As shown in FIG. 6F, the optical sheet 14 having the same curved shape as that of the support body is trimmed by using a trimming portion 105 as an unnecessary part or a part that becomes a hindrance in a later process as needed. It may be excised.

(First step-3)
First, a support 12 having a curved portion so as to be convex on one surface side is prepared. The manufacturing method of the support body 12 is not specifically limited, A well-known method is applicable. Further, the method for bending the support 12 is not particularly limited. For example, the support body 12 may be produced by injection molding a glass support body 12 having a curved portion so as to be convex on one surface side using a mold, or a glass sheet having a glass transition point or higher. And may be deformed by using a mold.

(Second step)
Next, the surface of the support 12 on the side on which the optical sheet 14 is superimposed, the surface selected from the surface of the optical sheet 14 on which the support 12 is superimposed, or the side of the support 12 on which the optical sheet 14 is superimposed. And an adhesive layer 13 of the support and the optical sheet are formed on both the surface selected from the surface on which the support 12 of the optical sheet 14 and the surface on which the support 12 is superimposed.

  The adhesive layer 13 of the support and the optical sheet can be obtained by applying a composition having an adhesive function or an adhesive function, for example, a thermocompression adhesive composition containing a heat sealant and drying it. The application means is not limited, but application with a uniform thickness is possible, for example, by spray coating.

(Third process)
Next, the support 12 having a curved shape on which the adhesive layer 13 of the support and the optical sheet is formed is bonded to the optical sheet 14 having the curved shape. FIG. 7 to FIG. 9 show conceptual diagrams of the bonding process. Here, the case where the bonding apparatus uses the vacuum laminating apparatus 200 which employ | adopted the vacuum laminating system which is a kind of thermocompression bonding is demonstrated as an example.

  As shown in FIG. 7, the support 12 having a curved shape in which the adhesive layer 13 of the support and the optical sheet is formed in the container 210 on the lower side of the vacuum laminator 200 and the bonding jig 201 is curved. The optical sheet 14 having a shape is set in an overlapping manner. At this time, a heat resistant rubber sheet 203 (for example, a sheet made of silicone rubber) is set on the upper part of the container 210 on the lower side of the vacuum laminating apparatus 200.

  The bonding jig 201 may be prepared exclusively for bonding so that the same curve as that of the support 12 can be formed, and a mold or the like used when providing the curve on the support 12 may be used. The forming jig 103 or the forming jig 103 may be used as the bonding jig 201.

  Subsequently, as shown in FIG. 8, after the rubber sheet 203 is heated by the heating apparatus 202 of the vacuum laminating apparatus, the inside of the apparatus is evacuated to push up the lower container 210 and at the same time, By setting the pressure to normal pressure (or 2 to 3 atm), the pressure difference between the lower container 210 and the upper container 220 is applied to the support 12 and the optical sheet 14 via the rubber sheet 203 and thermocompression bonded. That is, the optical sheet 14 is bonded to the support 12 through the adhesive layer 13 in a thermocompression bonding process.

  At this time, if a heating mechanism is provided in the bonding jig 201 and the support 12 can be heated, it is possible to bond more stably and reliably, and further suppress the occurrence of foam biting and increase productivity. It is desirable in terms of improvement.

  The temperature of the rubber sheet 203 when heated by the heating apparatus 202 of the vacuum laminating apparatus is a temperature at which the optical sheet 14 is not thermally deformed or damaged when contacting with the optical sheet 14, and the support and the optical sheet. It is desirable that the heat sealant contained in the adhesive layer 13 has a temperature at which the adhesive function is achieved.

In this way, durability against high temperature and high humidity can be improved by firmly bonding the support 12 and the optical sheet 14 via the adhesive layer 13 containing a heat sealant. The curved laminated body 11 can be produced as described above.

  Thereafter, the support and the adhesive layer 13 of the optical sheet can be cured, for example, by irradiating with ultraviolet rays, as required by the composition having the adhesive function or the adhesive function used.

  Further, in the case of the curved screen 10 having the configuration as illustrated in FIG. 3, it can be formed by combining the laminate 11 with a Fresnel lens sheet 21 having a curved shape similar to that of the laminate 11. Depending on the manufacturing process, trimming may be performed as necessary before or after combining with the Fresnel lens sheet 21 or before and after, and the curved screen 10 having an appropriate shape may be processed.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to this embodiment.

<Example 1>
Through the processes described below, a laminate as shown in FIG. 3 was produced.

(First step-1)
The optical sheet 14 includes a light diffusion layer 15 (main component is a copolymer of MBS: methyl methacrylate, butadiene, styrene), and an adhesive layer 16 (ultraviolet curable resin) in the optical sheet, from the side to be bonded to the support. ), An optical sheet 14 including a louver layer 20 and a louver base material 25 (polycarbonate resin) was used.

(First step-2)
The optical sheet 14 was curved three-dimensionally in the same curved shape as the support 12 by a vacuum molding machine using a mold of the same type as the support 12 made of glass as a molding jig 103. (See Figure 6)

(First step-3)
As the support 12, a glass plate having a width of 240 mm × length of 380 mm × thickness of 0.7 mm, the radius of curvature R at the portion having the smallest curvature radius is 15 mm, and the radius of curvature R at the portion having the largest curvature radius R is 200 mm. What was curved three-dimensionally was used.

(Second step)
As an adhesive composition for forming the adhesive layer 13 of the support and the optical sheet, a commercially available Arrow Base (registered trademark) SB-1200 manufactured by Unitika Ltd. was used. After spray coating the above-mentioned three-dimensionally curved optical sheet 14 so that the dry film thickness is 5 μm to 30 μm, it is dried with a hot air dryer at 90 ° C. for 90 seconds to bond the support and the optical sheet. Layer 13 was formed.

  In this example, an adhesive composition is used in which an adhesive layer 13 between the support and the optical sheet is formed in advance on the surface of the support made of glass in order to increase the adhesion strength between the support and the optical sheet. Was applied and dried.

(Third process)
An optical sheet obtained by placing the support 12 obtained as described above on the bonding jig 201 in the lower container 210 of the vacuum laminating apparatus 200 as shown in FIG. 14 was placed in place. At this time, a heat resistant rubber sheet 203 (for example, a sheet made of silicone rubber) is set on the upper part of the container 210 on the lower side of the vacuum laminating apparatus 200.

  Thereafter, the support 12 and the optical sheet 14 were fixed, the inside of the vacuum laminating apparatus 200 was evacuated, and the heat-resistant rubber sheet 203 was heated by the heating device 202 of the vacuum laminating apparatus. The output of the heating apparatus 202 of the vacuum laminating apparatus is such that the temperature of the rubber sheet 203 becomes 110 ° C. so that the support layer and the adhesive layer 13 of the optical sheet function and the optical sheet 14 is not thermally deformed or damaged. Controlled. Moreover, the jig | tool 201 for bonding was controlled so that the temperature of the support body 12 might be 110 degreeC.

  Next, as shown in FIG. 8, the bottom of the lower container 210 of the vacuum laminating apparatus 200 is pushed up and the inside of the upper container 220 is brought to normal pressure (or pressurized to about 2 to 3 atmospheres). Thus, the optical sheet 14 was bonded to the support 12 by the differential pressure between the lower container 210 and the upper container 220 through the rubber sheet 203. That is, the optical sheet 14 was bonded to the support 12 via the support containing the heat sealant and the adhesive layer 13 of the optical sheet.

  After the support 12 and the optical sheet 14 were bonded to form the laminated body 11 as described above, these were taken out from the vacuum laminating apparatus 200 to produce the curved laminated body 11 constituting the curved screen 10 of Example 1. .

  In the curved laminated body 11 of Example 1 constituting the curved screen 10, no bubble biting was visually observed.

(Comparative Example 1)
In Comparative Example 1, “first step-2” was not performed in the first step, and “first step-1” and “first step-3” were the same as in example 1. That is, the curved support body 12 made of the same glass as in Example 1 and the flat optical sheet 14 made of the same material and layer structure as in Example 1 and without the step of bending in three dimensions are omitted. Got ready.

  Similar to the second step in Example 1, as the adhesive composition for forming the support and the adhesive layer 13 of the optical sheet, a commercially available Arrow Base (registered trademark) SB-1200 manufactured by Unitika Ltd. was used. After spray coating the flat optical sheet 14 which is not curved to a thickness of 5 μm to 30 μm, it is dried with a hot air dryer at 90 ° C. for 90 seconds, and an adhesive layer 13 between the support and the optical sheet is formed. Formed.

  In addition, in order to increase the adhesion strength between the support and the optical sheet, the adhesive composition for forming the adhesive layer 13 between the support and the optical sheet was previously applied to the surface of the support made of glass and bonded to the optical sheet, and then dried. .

  Since the flat optical sheet 14 which is not curved is used, in Comparative Example 1, as a process corresponding to the “third process” of the example, a bonding jig in the lower container 210 of the vacuum laminator 200 is used. The support 12 is placed on 201, and the flat optical sheet 14 which is not curved is set on the upper part of the container 210 on the lower side of the vacuum laminating apparatus 200 (in the embodiment, the rubber sheet 203 is set).

  Thereafter, the inside of the vacuum laminating apparatus 200 was evacuated and heated to a temperature (120 ° C.) at which the optical sheet 14 began to bend by the heating apparatus 202 of the vacuum laminating apparatus. After heating and bending the optical sheet 14 in this way, the bottom of the lower container 210 of the vacuum laminating apparatus 200 is pushed up and the inside of the upper container 220 is brought to normal pressure (or about 2 to 3 atmospheres). The optical sheet 14 was bonded to the support 12 and the optical sheet 14 was three-dimensionally curved at the same time due to the differential pressure between the lower container 210 and the upper container 220. That is, the curved laminated body which comprises the curved screen 10 of the comparative example 1 was produced by bonding the optical sheet 14 to the support body 12 via the support body containing a heat seal agent, and the adhesive layer 13 of an optical sheet. (See Figure 8)

  In the curved laminated body of the comparative example 1 which comprises the curved screen 10, foam biting was able to be confirmed visually at a portion having a small curvature.

<Evaluation>
(High temperature test)
The laminated body which comprises the curved screen 10 which concerns on each example produced as mentioned above in the environment of 95 degreeC temperature for 500 hours was set | placed. Then, it stood to cool at room temperature for 24 hours. As a result, in the laminate 11 constituting the curved screen 10 according to Example 1, each layer did not peel off. On the other hand, the laminate according to Comparative Example 1 was peeled between the support 12 and the optical sheet 14 when left at room temperature for 24 hours without performing a high temperature test. As described above, it was confirmed that the laminate constituting the curved screen 10 of Example 1 was firmly bonded and the high temperature resistance was improved.

  (High Humidity Test) The laminated body constituting the curved screen 10 according to Example 1 and Comparative Example 1 manufactured as described above was placed in an environment of an air temperature of 60 ° C. and a relative humidity of 90% for 500 hours. Then, it stood to cool at room temperature for 24 hours. As a result, in the laminate 11 constituting the curved screen 10 according to Example 1, each layer did not peel off. On the other hand, the laminate constituting the curved screen 10 according to Comparative Example 1 peeled between the support 12 and the optical sheet 14 when left in an indoor environment for 24 hours without performing a high humidity test. As described above, it was confirmed that the laminate 11 constituting the curved screen 10 of Example 1 was firmly bonded, and the high humidity resistance was improved.

DESCRIPTION OF SYMBOLS 1 Display apparatus 2 Housing | casing 3 Image | video light source 10 Curved screen 11 Laminated body 12 Support body 13 Adhesive layer 14 (of a support body and an optical sheet) Optical sheet 15 Light diffusion layer 16 Adhesive layer 17 (in an optical sheet) Optical functional layer 18 Light transmitting portion 19 Light absorbing portion 20 Louver layer 21 Fresnel lens sheet 22 Fresnel lens base material 23 Fresnel lens portion 24 Unit lens 25 Louver base material 101 (Vacuum forming machine) Heating tool 102 Fixing tool 103 Molding jig 104 Vacuum valve 105 Trimming unit 200 Vacuum laminating apparatus 201 Bonding jig 202 Heater 203 (for vacuum laminating apparatus) Rubber sheet 210 Lower container 220 Upper container

Claims (4)

A method for producing a laminate comprising a curved screen comprising a laminate having a curved portion so as to be convex on at least one surface side,
The laminate includes a light-transmissive support and an optical sheet,
Preparing the support having a curved portion so as to be convex on at least one surface side, and the optical sheet having a curved shape similar to the support;
Forming an adhesive layer on one or more surfaces selected from the surface of the support on which the optical sheet is stacked, or the surface of the optical sheet on which the support is stacked;
Bonding the optical sheet and the support through the adhesive layer;
The manufacturing method of the laminated body which comprises a curved-surface screen characterized by the above-mentioned. The adhesive layer includes a heat sealant;
The method for producing a laminate constituting a curved screen according to claim 1, wherein the step of bonding the optical sheet and the support through the adhesive layer is a thermocompression bonding step.   The optical sheet is subjected to a vacuum forming process using a molding jig of the same type as the mold used for forming the support body having a curved portion so as to be convex on at least one surface side. The manufacturing method according to claim 1 or 2, wherein the laminated body constituting the curved screen has a curved shape similar to that of the support. The step of bonding the optical sheet and the support through the adhesive layer of the support and the optical sheet,
Using a vacuum laminator with a lower container and an upper container,
Placing the support on a bonding jig in the lower container of the vacuum laminator, and placing the optical sheet at a predetermined position;
Setting a rubber sheet on top of the lower container of the vacuum laminator;
By pushing up the bottom of the lower container of the vacuum laminating apparatus and setting the inside of the upper container to normal pressure or pressurization, the inside of the lower container and the upper container through the rubber sheet A step of bonding the optical sheet to the support by a differential pressure with
The manufacturing method of the laminated body which comprises the curved screen in any one of Claims 1 thru | or 3 characterized by the above-mentioned.

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