Optical component assembly

Abstract

This invention provides a lens section that enables lightweighting and improved visibility in VR goggles. The lens section of this embodiment is used in a display system for displaying images to a user, and includes: a reflective polarizing member that reflects light emitted forward from the display surface of a display element and passing through the polarizing member and a first λ / 4 member; a first lens section disposed in the optical path between the display element and the reflective polarizing member; a semi-reflective mirror disposed between the display element and the first lens section, which transmits light emitted from the display element and reflects light reflected by the reflective polarizing member back to the reflective polarizing member; a second lens section disposed in front of the reflective polarizing member; and a second λ / 4 member disposed in the optical path between the semi-reflective mirror and the reflective polarizing member; wherein the ISC value of the assembly formed by arranging three first laminated sections in the lens section is 100 or less, and the first laminated section includes the second λ / 4 member and at least one adhesive layer.

Description

Technical Field

[0001] This invention relates to a lens portion, a display body, and a display method. Prior Technology

[0002] Image display devices, represented by liquid crystal displays and electroluminescent (EL) displays (such as organic EL displays), are rapidly becoming widespread. In order to realize image display and improve the performance of image display, optical components such as polarizing components and phase difference components are generally used in image display devices (see, for example, Patent Document 1).

[0003] In recent years, new applications for image display devices have been developed. For example, there has been the commercialization of VR goggles (VR goggles) with integrated displays for Virtual Reality (VR). There is a desire to reduce the weight of VR goggles and improve their visibility by considering their use in various situations. Weight reduction can be achieved, for example, by making the lenses used in VR goggles thinner. On the other hand, there is also a desire to develop optical components suitable for display systems using thin lenses. Previous technical documents Patent documents

[0004] Patent Document 1: Japanese Patent Application Publication No. 2021-103286 Summary of the Invention

[0005] The problem the invention aims to solve In view of the above, the main objective of the present invention is to provide a lens unit that can achieve lightweighting and improved visibility of VR goggles.

[0006] The means to solve the problem 1. The lens portion of the present invention is used in a display system for displaying images to a user, comprising: a reflective polarizing member that reflects light emitted forward from the display surface of a display element displaying the image and passing through the polarizing member and the first λ / 4 member; a first lens portion disposed in the optical path between the display element and the reflective polarizing member; a semi-reflective mirror disposed between the display element and the first lens portion, the semi-reflective mirror transmitting light emitted from the display element and reflecting light reflected by the reflective polarizing member toward the reflective polarizing member; a second lens portion disposed in front of the reflective polarizing member; and a second λ / 4 member disposed in the optical path between the semi-reflective mirror and the reflective polarizing member; wherein the ISC value of the assembly formed by arranging three first laminated portions in the lens portion is 100 or less, and the first laminated portion includes the second λ / 4 member and at least one adhesive layer. 2. The lens portion as described in 1 may also have a second laminate portion including the aforementioned reflective polarizing member. 3. In the lens section as described in 2 above, the first lamination section and the second lamination section may also be arranged with a gap between them. 4. In the lens section as described in 2 or 3 above, the second lamination section may also include an absorptive polarizing member disposed between the reflective polarizing member and the second lens section. 5. In any of the lens portions described in 2 to 4 above, the second lamination portion may also include a third λ / 4 member disposed between the reflective polarizing member and the second lens portion. 6. In any of the lens portions described in 1 to 5 above, the first laminate portion may also include a first protective member disposed in front of the second λ / 4 member. 7. In the lens portion as described in any of items 1 to 6 above, the adhesive layer contained in the first lamination portion may also be 3 layers or less. 8. In the lens portion as described in any of items 1 to 7 above, the thickness of each adhesive layer contained in the first lamination portion may be 20µm or less. 9. In the lens portion as described in any of items 1 to 8 above, the surface roughness Ra of each adhesive layer contained in the first lamination portion may also be 20 nm or less. 10. In any of the lens portions described in 1 to 9 above, each of the adhesive layers contained in the first lamination portion may also be a single layer. 11. In any of the lens portions described in items 1 to 10 above, the first lens portion and the semi-reflective mirror may also be integrated. 12. The display body of the embodiment of the present invention has a lens portion as described in any one of 1 to 11 above.

[0007] 13. The display method of the present invention comprises the following steps: passing light of a display image emitted through a polarizing member and a first λ / 4 member through a semi-reflective mirror and a first lens; passing the light passing through the semi-reflective mirror and the first lens through a second λ / 4 member; causing the light passing through the second λ / 4 member to be reflected by a reflective polarizing member toward the semi-reflective mirror; transmitting the light reflected by the reflective polarizing member and the semi-reflective mirror through the second λ / 4 member; and passing the light transmitted through the reflective polarizing member through a second lens; wherein the ISC value of the assembly formed by arranging three first laminated portions is 100 or less, and the first laminated portion includes the second λ / 4 member and at least one adhesive layer.

[0008] Invention Effects According to the lens portion of the present invention, the VR goggles can be made lighter and have improved visibility. Simple Explanation of the Diagram

[0009] Figure 1 is a schematic diagram showing the general configuration of a display system according to an embodiment of the present invention. Figure 2 is a schematic cross-sectional view showing a detail of the lens section of the display system shown in Figure 1. Figure 3 is a schematic perspective view showing an example of a multilayer structure contained in a reflective polarizing film. Figure 4 is a diagram illustrating the method for determining the ISC value. Implementation

[0010] The following description refers to embodiments of the present invention with reference to the drawings, but the present invention is not limited to these embodiments. Furthermore, for the purpose of more clearly illustrating the drawings, the width, thickness, shape, etc., of each part are schematically shown compared to the embodiments, but this is only an example and is not intended to limit the interpretation of the present invention.

[0011] (Definitions of terms and symbols) The terms and symbols used in this instruction manual are defined as follows. (1) Refractive index (nx, ny, nz) "nx" is the refractive index in the direction where the in-plane refractive index reaches its maximum (i.e., the slow axis direction), "ny" is the refractive index in the direction orthogonal to the slow axis (i.e., the fast axis direction), and "nz" is the refractive index in the thickness direction. (2) In-plane phase difference (Re) "Re(λ)" is the in-plane phase difference measured at 23°C using light with a wavelength of λnm. For example, "Re(550)" is the in-plane phase difference measured at 23°C using light with a wavelength of 550nm. Re(λ) can be calculated using the formula: Re(λ) = (nx - ny) × d when the thickness of the layer (thin film) is d (nm). (3) Phase difference (Rth) in the thickness direction "Rth(λ)" is the phase difference in the thickness direction measured at 23°C using light with a wavelength of λnm. For example, "Rth(550)" is the phase difference in the thickness direction measured at 23°C using light with a wavelength of 550nm. Rth(λ) can be calculated using the formula: Rth(λ) = (nx - nz) × d when the layer (thin film) thickness is d (nm). (4) Nz coefficient The Nz coefficient can be obtained by Nz=Rth / Re. (5) Angle When an angle is mentioned in this specification, the angle includes both clockwise and counterclockwise directions relative to a reference direction. Therefore, for example, "45°" refers to ±45°.

[0012] Figure 1 is a schematic diagram showing the general configuration of a display system according to an embodiment of the present invention. Figure 1 schematically illustrates the arrangement and shape of each component of the display system 2. The display system 2 includes: a display element 12, a reflective polarizing member 14, a first lens portion 16, a semi-reflective mirror 18, a first phase difference member 20, a second phase difference member 22, and a second lens portion 24. The reflective polarizing member 14 is disposed on the display surface 12a side of the display element 12, i.e., in front, and reflects light emitted from the display element 12. The first lens portion 16 is disposed in the optical path between the display element 12 and the reflective polarizing member 14, and the semi-reflective mirror 18 is disposed between the display element 12 and the first lens portion 16. The first phase difference member 20 is disposed in the optical path between the display element 12 and the semi-reflective mirror 18, and the second phase difference member 22 is disposed in the optical path between the semi-reflective mirror 18 and the reflective polarizing member 14.

[0013] Sometimes, the components arranged in front of the semi-reflective mirror (in the example, the semi-reflective mirror 18, the first lens section 16, the second phase difference member 22, the reflective polarizing member 14, and the second lens section 24) are collectively referred to as the lens section (lens section 4).

[0014] The display element 12 is, for example, a liquid crystal display or an organic EL display, and has a display surface 12a for displaying images. Light emitted from the display surface 12a may pass through a polarizing member (represented by a polarizing film) that may be included in the display element 12 before being emitted as first linearly polarized light.

[0015] The first phase difference member 20 includes a first λ / 4 member, which can convert the first linearly polarized light incident on the first phase difference member 20 into the first circularly polarized light. When the first phase difference member does not include any member other than the first λ / 4 member, the first phase difference member is equivalent to the first λ / 4 member. The first phase difference member 20 can also be disposed on the display element 12 as an integral part.

[0016] The semi-reflective mirror 18 transmits light emitted from the display element 12 and reflects light reflected by the reflective polarizing member 14 back to the reflective polarizing member 14. The semi-reflective mirror 18 is integrally mounted on the first lens portion 16.

[0017] The second phase difference member 22 includes the second λ / 4 member, which allows light reflected from the reflective polarizer 14 and the semi-reflective mirror 18 to pass through the reflective polarizer 14. When the second phase difference member does not include any member other than the second λ / 4 member, the second phase difference member is equivalent to the second λ / 4 member. The second phase difference member 22 may also be integrally formed on the first lens portion 16.

[0018] The first circularly polarized light emitted from the first λ / 4 member of the first phase difference member 20 passes through the half-reflector 18 and the first lens section 16, and is converted into second linearly polarized light by the second λ / 4 member of the second phase difference member 22. The second linearly polarized light emitted from the second λ / 4 member does not pass through the reflective polarizer 14 but is reflected towards the half-reflector 18. At this time, the polarization direction of the second linearly polarized light incident on the reflective polarizer 14 is in the same direction as the reflection axis of the reflective polarizer 14. Therefore, the second linearly polarized light incident on the reflective polarizer 14 is reflected by the reflective polarizer 14.

[0019] The second linearly polarized light reflected by the reflective polarizer 14 is converted into second circularly polarized light by the second λ / 4 member contained in the second phase difference member 22. The second circularly polarized light emitted from the second λ / 4 member is reflected by the half-reflector 18 after passing through the first lens section 16. The second circularly polarized light reflected by the half-reflector 18 passes through the first lens section 16 and is converted into third linearly polarized light by the second λ / 4 member contained in the second phase difference member 22. The third linearly polarized light is transmitted through the reflective polarizer 14. At this time, the polarization direction of the third linearly polarized light incident on the reflective polarizer 14 is in the same direction as the transmission axis of the reflective polarizer 14. Therefore, the third linearly polarized light incident on the reflective polarizer 14 is transmitted through the reflective polarizer 14.

[0020] The light from the transmissive-reflective polarizing member 14 passes through the second lens section 24 and enters the user's eye 26.

[0021] For example, the absorption axis of the polarizing member included in the display element 12 and the reflection axis of the reflective polarizing member 14 can be configured to be substantially parallel to each other, or substantially orthogonal. The angle formed by the absorption axis of the polarizing member included in the display element 12 and the slow axis of the first λ / 4 member included in the first phase difference member 20 is, for example, 40°~50°, 42°~48°, or approximately 45°. The angle formed by the absorption axis of the polarizing member included in the display element 12 and the slow axis of the second λ / 4 member included in the second phase difference member 22 is, for example, 40°~50°, 42°~48°, or approximately 45°.

[0022] The in-plane phase difference Re(550) of the first λ / 4 component is, for example, 100nm~190nm, 110nm~180nm, 130nm~160nm, or 135nm~155nm. The first λ / 4 component should exhibit the inverse dispersion wavelength characteristic that the phase difference value increases with the wavelength of the measured light. The Re(450) / Re(550) of the first λ / 4 component is, for example, 0.75 or more and less than 1, or 0.8 or more and less than 0.95.

[0023] The in-plane phase difference Re(550) of the second λ / 4 component is, for example, 100nm~190nm, 110nm~180nm, 130nm~160nm, or 135nm~155nm. The second λ / 4 component should exhibit the inverse dispersion wavelength characteristic that the phase difference value increases with the wavelength of the measured light. The Re(450) / Re(550) of the second λ / 4 component is, for example, 0.75 or more and less than 1, or 0.8 or more and less than 0.95.

[0024] In the lens section 4, a space may be formed between the first lens section 16 and the second lens section 24. In this case, the component disposed between the first lens section 16 and the second lens section 24 should preferably be integrally formed on either the first lens section 16 or the second lens section 24. For example, the component disposed between the first lens section 16 and the second lens section 24 should preferably be integrally formed on either the first lens section 16 or the second lens section 24 through an adhesive layer. According to this configuration, for example, the processing quality of each component can be excellent. The adhesive layer can be formed by an adhesive or a binder. Specifically, the adhesive layer can be an adhesive layer or a binder layer. The thickness of the adhesive layer is, for example, 0.05µm to 30µm.

[0025] Figure 2 is a schematic cross-sectional view showing an example of the details of the lens section of the display system shown in Figure 1. Specifically, Figure 2 shows a first lens section, a second lens section, and components disposed between them. The lens section 4 includes: a first lens section 16, a first laminated section 100 disposed adjacent to the first lens section 16, a second lens section 24, and a second laminated section 200 disposed adjacent to the second lens section 24. In the example shown in Figure 2, the first laminated section 100 and the second laminated section 200 are disposed with a gap between them. Although not shown, a semi-reflective mirror can be provided on the first lens section 16 to form an integral unit.

[0026] The first lamination portion 100 includes a second phase difference member 22 and an adhesive layer 41 disposed between the first lens portion 16 and the second phase difference member 22, and is integrally formed on the first lens portion 16 by means of the adhesive layer 41. The first lamination portion 100 further includes a first protective member 31 disposed in front of the second phase difference member 22. The first protective member 31 is laminated onto the second phase difference member 22 through the adhesive layer 42. The first protective member 31 may be located on the outermost surface of the first lamination portion 100.

[0027] In the example shown in Figure 2, the second phase difference member 22, in addition to the second λ / 4 member 22a, also includes a member (so-called positive C plate) 22b whose refractive index characteristics exhibit the relationship nz>nx=ny. The second phase difference member 22 has a laminated structure of the second λ / 4 member 22a and the positive C plate 22b. As shown in Figure 2, in the second phase difference member 22, the second λ / 4 member 22a is preferably located further forward than the positive C plate 22b. The second λ / 4 member 22a and the positive C plate 22b are, for example, laminated through an adhesive layer (not shown).

[0028] The above-mentioned second λ / 4 member preferably has a refractive index characteristic showing a relationship of nx > ny ≧ nz. Here, "ny = nz" not only includes the case where ny and nz are exactly the same, but also includes the case where they are substantially the same. Therefore, within the scope that does not impair the effects of the present invention, there may be a case where ny < nz. The Nz coefficient of the second λ / 4 member is preferably 0.9 to 3, more preferably 0.9 to 2.5, still more preferably 0.9 to 1.5, and particularly preferably 0.9 to 1.3.

[0029] The second λ / 4 member is formed of any suitable material that can satisfy the above characteristics. The second λ / 4 member can be, for example, a stretched film of a resin film or an alignment cured layer of a liquid crystal compound.

[0030] Examples of the resin contained in the above resin film include: polycarbonate resin, polyester carbonate resin, polyester resin, polyvinyl acetal resin, polyarylate resin, cyclic olefin resin, cellulose resin, polyvinyl alcohol resin, polyamide resin, polyimide resin, polyether resin, polystyrene resin, acrylic resin, etc. These resins can be used alone or in combination. Examples of the combination method include blending and copolymerization. When the second λ / 4 member exhibits an inverse dispersion wavelength characteristic, a resin film containing a polycarbonate resin or a polyester carbonate resin (hereinafter sometimes only referred to as a polycarbonate resin) can be preferably used.

[0031] The aforementioned polycarbonate resin may be any suitable polycarbonate resin. For example, the polycarbonate resin comprises structural units derived from genus dihydroxy compounds, structural units derived from isosorbide dihydroxy compounds, and structural units derived from at least one dihydroxy compound selected from the group consisting of alicyclic diols, alicyclic diethanols, di-, tri-, or polyethylene glycols, and alkyl diols or spiroglycerides. The polycarbonate resin preferably comprises structural units derived from genus dihydroxy compounds, structural units derived from isosorbide dihydroxy compounds, structural units derived from alicyclic diethanols, and / or structural units derived from di-, tri-, or polyethylene glycols; more preferably, it comprises structural units derived from genus dihydroxy compounds, structural units derived from isosorbide dihydroxy compounds, and structural units derived from di-, tri-, or polyethylene glycols. The polycarbonate resin may also, as needed, comprise structural units derived from other dihydroxy compounds. Furthermore, detailed descriptions of the polycarbonate resin suitable for the second λ / 4 component and the method for forming the second λ / 4 component are, for example, described in Japanese Patent Application Publication No. 2014-10291, Japanese Patent Application Publication No. 2014-26266, Japanese Patent Application Publication No. 2015-212816, Japanese Patent Application Publication No. 2015-212817, and Japanese Patent Application Publication No. 2015-212818, and this specification incorporates the descriptions in these publications by reference.

[0032] The thickness of the second λ / 4 member formed by extending the resin film is, for example, 10µm to 100µm, preferably 10µm to 70µm, and more preferably 20µm to 60µm.

[0033] The aforementioned orientation-cured layer of liquid crystal compounds is a layer in which the liquid crystal compounds are oriented in a predetermined direction within the layer, and their orientation state is fixed. Furthermore, the concept of an "orientation-cured layer" includes an orientation-cured layer obtained by curing liquid crystal monomers, as described later. Taking the 2λ / 4 member as an example, it represents the orientation (plane orientation) of the rod-shaped liquid crystal compounds arranged along the slow axis direction of the 2λ / 4 member. Examples of rod-shaped liquid crystal compounds include liquid crystal polymers and liquid crystal monomers. The liquid crystal compounds should preferably be polymerizable. If the liquid crystal compounds are polymerizable, they can be polymerized after orientation, thereby fixing the orientation state of the liquid crystal compounds.

[0034] The aforementioned liquid crystal compound orientation-cured layer (liquid crystal orientation-cured layer) can be formed by: performing an orientation treatment on the surface of a predetermined substrate, applying a coating liquid containing a liquid crystal compound to the surface, orienting the liquid crystal compound in the direction corresponding to the orientation treatment, and fixing the orientation state. The orientation treatment can be any suitable orientation treatment. Specifically, examples include mechanical orientation treatment, physical orientation treatment, and chemical orientation treatment. Specific examples of mechanical orientation treatment include friction treatment and stretching treatment. Specific examples of physical orientation treatment include magnetic field orientation treatment and electric field orientation treatment. Specific examples of chemical orientation treatment include oblique vapor deposition and photo-orientation treatment. The processing conditions for each orientation treatment can be any suitable condition according to the purpose.

[0035] The orientation of the liquid crystal compound can be performed at a temperature at which a liquid crystal phase can be displayed, depending on the type of liquid crystal compound. By performing the temperature treatment, the liquid crystal compound will become a liquid crystal state, and the liquid crystal compound will be oriented according to the orientation treatment direction of the substrate surface.

[0036] In one embodiment, the orientation is fixed by cooling the liquid crystal compound oriented as described above. When the liquid crystal compound is polymerizable or crosslinkable, the orientation is fixed by performing a polymerization or crosslinking treatment on the liquid crystal compound oriented as described above.

[0037] The aforementioned liquid crystal compound may use any suitable liquid crystal polymer and / or liquid crystal monomer. The liquid crystal polymer and liquid crystal monomer may be used alone or in combination. Specific examples of liquid crystal compounds and methods for manufacturing liquid crystal orientation-cured layers are described, for example, in Japanese Patent Application Publication No. 2006-163343, Japanese Patent Application Publication No. 2006-178389, and International Publication No. 2018 / 123551. This specification incorporates the descriptions in these publications by reference.

[0038] The thickness of the second λ / 4 component, which is composed of a liquid crystal orientation curing layer, is, for example, 1µm to 10µm, preferably 1µm to 8µm, more preferably 1µm to 6µm, and even more preferably 1µm to 4µm.

[0039] The phase difference Rth(550) in the thickness direction of the aforementioned positive C-plate should preferably be -50nm to -300nm, more preferably -70nm to -250nm, even more preferably -90nm to -200nm, and especially preferably -100nm to -180nm. Here, "nx = ny" includes not only the case where nx and ny are strictly equal, but also the case where nx and ny are substantially equal. The in-plane phase difference Re(550) of the positive C-plate is, for example, less than 10nm.

[0040] The positive C-plate can be formed from any suitable material, but it is preferably composed of a thin film containing a liquid crystal material fixed in a vertical orientation. The liquid crystal material (liquid crystal compound) that enables vertical orientation can be a liquid crystal monomer or a liquid crystal polymer. Specific examples of the liquid crystal compound and the method for forming the positive C-plate can be found in paragraphs

[0020] to

[0028] of Japanese Patent Application Publication No. 2002-333642, which describes the liquid crystal compound and the method for forming the phase retardation layer. In this case, the thickness of the positive C-plate is preferably 0.5µm to 5µm.

[0041] The aforementioned first protective component typically includes a substrate. The thickness of the substrate is preferably 5µm to 80µm, more preferably 10µm to 50µm, and even more preferably 15µm to 40µm. The substrate can be composed of any suitable thin film. Examples of materials that are the main components of the film constituting the substrate include, for example, cellulose resins such as cellulose triacetate (TAC), polyester resins, polyvinyl alcohol resins, polycarbonate resins, polyamine resins, polyimide resins, polyether resins, polyurethane resins, polystyrene resins, polynorphine resins, cycloolefin resins, polyolefin resins, (meth)acrylic resins, and acetate resins. Here, (meth)acrylic acid refers to acrylic acid and / or methacrylic acid. In one embodiment, the substrate is preferably composed of a (meth)acrylic acid resin. By using a (meth)acrylic acid resin, a substrate with excellent smoothness can be produced by extrusion molding. Furthermore, a protective component with excellent smoothness can be obtained.

[0042] The first protective member preferably has a substrate and a surface treatment layer formed on the substrate. The first protective member having the surface treatment layer can be configured such that the surface treatment layer is located on the front side. Specifically, the surface treatment layer can be located on the outermost surface of the first laminated portion. The surface treatment layer can have any suitable function. For example, from the viewpoint of improving visibility, the surface treatment layer preferably has an anti-reflective function. The thickness of the surface treatment layer is preferably 0.5µm to 10µm, more preferably 1µm to 7µm, and even more preferably 2µm to 5µm.

[0043] The second lamination 200 includes a reflective polarizing member 14 and an adhesive layer disposed between the reflective polarizing member 14 and the second lens portion 24. For example, from the viewpoint of improving visibility, the second lamination 200 further includes an absorptive polarizing member 28 disposed between the reflective polarizing member 14 and the second lens portion 24. The absorptive polarizing member 28 is laminated in front of the reflective polarizing member 14 via the adhesive layer 44. The reflection axis of the reflective polarizing member 14 and the absorption axis of the absorptive polarizing member 28 can be configured to be substantially parallel to each other, and the transmission axis of the reflective polarizing member 14 and the transmission axis of the absorptive polarizing member 28 can be configured to be substantially parallel to each other. By laminating the adhesive layer, the reflective polarizing member 14 and the absorptive polarizing member 28 are fixed, preventing misalignment of the reflection axis and the absorption axis (transmission axis and transmission axis). Furthermore, it can suppress the adverse effects caused by the air layer that may form between the reflective polarizing member 14 and the absorptive polarizing member 28.

[0044] The second laminate 200 further includes a second protective member 32 disposed behind the reflective polarizing member 14. The second protective member 32 is laminated onto the reflective polarizing member 14 through an adhesive layer 43. The second protective member 32 may be located on the outermost surface of the second laminate 200. The second protective member, like the first protective member described above, may include a substrate. Furthermore, the second protective member preferably has a substrate and a surface treatment layer formed on the substrate. In this case, the surface treatment layer may be located on the outermost surface of the second laminate. The same description as that for the first protective member applies to the details of the substrate and the surface treatment layer described above.

[0045] As shown in Figure 2, the second stacked portion 200 may further include a third phase difference member 30 disposed between the absorptive polarizing member 28 and the second lens portion 24. The third phase difference member 30 is stacked on the absorptive polarizing member 28 through an adhesive layer 45. Furthermore, the third phase difference member 30 is stacked on the second lens portion 24 through an adhesive layer 46, and the second stacked portion 200 is integrally formed on the second lens portion 24. The third phase difference member 30 may include, for example, a third λ / 4 member. The angle formed by the absorption axis of the absorptive polarizing member 28 and the slow axis of the third λ / 4 member included in the third phase difference member 30 is, for example, 40°~50°, possibly 42°~48°, or approximately 45°. By providing the aforementioned member, for example, reflection of external light from the second lens portion 24 side can be prevented. When the third phase difference member does not include any members other than the third λ / 4 member, the third phase difference member is equivalent to the third λ / 4 member.

[0046] The aforementioned reflective polarizing member can transmit light with polarized light parallel to its transmission axis (represented by linearly polarized light) while maintaining its polarization state, and reflect light with other polarization states. The reflective polarizing member is typically constructed of a thin film with a multilayer structure (sometimes called a reflective polarizing thin film). In this case, the thickness of the reflective polarizing member is, for example, 10µm to 150µm, preferably 20µm to 100µm, and more preferably 30µm to 60µm.

[0047] Figure 3 is a schematic perspective view showing an example of a multilayer structure contained in a reflective polarizing film. The multilayer structure 14a alternates between a birefringent layer A and a substantially non-birefringent layer B. The total number of layers constituting the multilayer structure can be 50 to 1000. For example, the refractive index nx of layer A along the x-axis is greater than the refractive index ny along the y-axis, while the refractive index nx of layer B along the x-axis and the refractive index ny along the y-axis are substantially the same; the refractive index difference between layer A and layer B is large along the x-axis but substantially zero along the y-axis. As a result, the x-axis becomes the reflection axis, and the y-axis becomes the transmission axis. The refractive index difference between layer A and layer B along the x-axis should preferably be 0.2 to 0.3.

[0048] Layer A above represents a material that exhibits birefringence through stretching. Examples of such materials include polyester naphthalene (e.g., polyethylene naphthalate), polycarbonate, and acrylic resins (e.g., polymethyl methacrylate). Layer B above represents a material that does not substantially exhibit birefringence even when stretched. Examples of such materials include, for instance, a copolyester of naphthalene and terephthalic acid. The multilayer structure can be formed by combining co-extrusion and stretching. For example, after extruding the materials constituting layer A and layer B, multilayering is performed (e.g., using a multiplier). Then, the resulting multilayer is stretched. The x-axis direction in the illustration corresponds to the stretching direction.

[0049] Commercially available reflective polarizing films include, for example, those manufactured by 3M under the brand names "DBEF" and "APF", and those manufactured by Nitto Denko under the brand name "APCF".

[0050] The orthogonal transmittance (Tc) of the reflective polarizing element (reflective polarizing film) can be, for example, 0.01% to 3%. The single-unit transmittance (Ts) of the reflective polarizing element (reflective polarizing film) can be, for example, 43% to 49%, preferably 45% to 47%. The polarization (P) of the reflective polarizing element (reflective polarizing film) can be, for example, 92% to 99.99%.

[0051] The aforementioned orthogonal transmittance, single-unit transmittance, and polarization can be measured, for example, using an ultraviolet-visible spectrophotometer. Polarization P can be calculated from the obtained Tp and Tc by measuring single-unit transmittance Ts, parallel transmittance Tp, and orthogonal transmittance Tc using an ultraviolet-visible spectrophotometer and then using the following formula. Furthermore, Ts, Tp, and Tc are Y values ​​measured using a 2-degree field of view (C light source) according to JIS Z 8701 and corrected for visual sensitivity. Polarization P(%) = {(Tp-Tc) / (Tp+Tc)}1 / 2×100

[0052] The aforementioned absorptive polarizing component may include a resin film containing a dichroic substance (sometimes referred to as an absorptive polarizing film). The thickness of the absorptive polarizing film may be, for example, 1µm or more and 20µm or less, 2µm or more and 15µm or less, 12µm or less, 10µm or less, 8µm or less, or 5µm or less.

[0053] The aforementioned absorptive polarizing film can be made from a single layer of resin film, or it can be made from two or more layers of laminate.

[0054] When fabricating a single-layer resin film, an absorptive polarizing film can be obtained by performing dyeing treatments using dichroic substances such as iodine or dichroic dyes on hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and partially saponified ethylene-vinyl acetate copolymer films. Among these, an absorptive polarizing film obtained by dyeing a PVA film with iodine and then performing uniaxial stretching is preferred.

[0055] The aforementioned dyeing using iodine can be performed, for example, by immersing the PVA-based film in an aqueous iodine solution. The uniaxial stretching ratio is preferably 3 to 7 times. Stretching can be performed after dyeing or during dyeing. Alternatively, it can be performed after stretching and then dyeing. Depending on the requirements, the PVA-based film may undergo swelling treatment, crosslinking treatment, washing treatment, drying treatment, etc.

[0056] As an example of a laminated body manufactured using two or more layers, the following laminated bodies can be cited: a laminated body of a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate; or a laminated body of a resin substrate and a PVA-based resin layer coated on the resin substrate. An absorptive polarizing film obtained using a laminated body of a resin substrate and a PVA-based resin layer coated on the resin substrate can be manufactured, for example, by the following steps: coating a PVA-based resin solution onto a resin substrate and drying it to form a PVA-based resin layer on the resin substrate, thereby obtaining a laminated body of the resin substrate and the PVA-based resin layer; and extending and dyeing the laminated body to form an absorptive polarizing film from the PVA-based resin layer. In this embodiment, it is preferable to form a polyvinyl alcohol-based resin layer containing a halide and a polyvinyl alcohol-based resin on one side of the resin substrate. Extending typically includes extending the laminated body by immersing it in an aqueous boric acid solution. Furthermore, depending on the requirements, the stretching can be further included by air-stretching the laminate at a high temperature (e.g., above 95°C) before stretching in a boric acid aqueous solution. In this embodiment, the laminate is preferably subjected to a drying shrinkage treatment, which involves heating the laminate while conveying it along its length to shrink it by more than 2% in its width direction. In other words, the manufacturing method of this embodiment includes sequentially performing air-assisted stretching, dyeing, underwater stretching, and drying shrinkage treatments on the laminate. By introducing assisted stretching, even when PVA is coated onto a thermoplastic resin, the crystallinity of PVA can be improved, achieving high optical properties. Furthermore, by simultaneously improving the orientation of PVA beforehand, problems such as reduced orientation or dissolution of PVA can be prevented when immersed in water during subsequent dyeing or stretching steps, thus achieving high optical properties. Moreover, when the PVA-based resin layer is immersed in a liquid, compared to the case where the PVA-based resin layer does not contain halides, the orientation disorder and reduction of polyvinyl alcohol molecules can be suppressed more effectively. This improves the optical properties of the absorptive polarizing film obtained by immersing the laminate in a liquid through dyeing and water stretching processes. Furthermore, by shrinking the laminate in the width direction through a drying shrinkage process, optical properties are further enhanced. The resulting resin-based / absorptive polarizing film laminate can be used directly (i.e., the resin substrate can be used as a protective layer for the absorptive polarizing film), or it can be used as a suitable protective layer on the peel surface after the resin substrate is peeled from the laminate, or on the area layer opposite the peel surface. Detailed descriptions of the manufacturing method of the absorptive polarizing film are provided, for example, in Japanese Patent Application Publication No. 2012-73580 and Japanese Patent No. 6470455. The entire contents of these publications are incorporated herein by reference.

[0057] The orthogonal transmittance (Tc) of the absorptive polarizing element (absorption polarizing film) should preferably be 0.5% or less, more preferably 0.1% or less, and even more preferably 0.05% or less. The monomer transmittance (Ts) of the absorptive polarizing element (absorption polarizing film) should, for example, be 41.0% to 45.0%, preferably 42.0% or more. The polarization (P) of the absorptive polarizing element (absorption polarizing film) should, for example, be 99.0% to 99.997%, preferably 99.9% or more.

[0058] The in-plane phase difference Re(550) of the aforementioned third λ / 4 component is, for example, 100nm~190nm, possibly 110nm~180nm, possibly 130nm~160nm, or possibly 135nm~155nm. The third λ / 4 component should preferably exhibit the inverse dispersion wavelength characteristic where the phase difference value increases with the wavelength of the measured light. The Re(450) / Re(550) of the third λ / 4 component is, for example, 0.75 or more and less than 1, or possibly 0.8 or more and less than 0.95. The third λ / 4 component should preferably exhibit a refractive index characteristic showing the relationship nx>ny≧nz. The Nz coefficient of the third λ / 4 component should preferably be 0.9~3, more preferably 0.9~2.5, more preferably 0.9~1.5, and especially preferably 0.9~1.3.

[0059] The third λ / 4 component is formed from any suitable material that satisfies the above-mentioned characteristics. For example, the third λ / 4 component can be an extended film of a resin film or a directionally cured layer of a liquid crystal compound. The same description as that for the second λ / 4 component can be applied to the third λ / 4 component. The second λ / 4 component and the third λ / 4 component can be components with the same structure (e.g., forming material, thickness, optical properties, etc.) or components with different structures.

[0060] In the lens section 4, the ISC value of the assembly formed by arranging three first laminated sections, from the member located further forward of the first lens section 16 to the member located further behind the reflective polarizing member 14, is preferably 90 or less, more preferably 80 or less, and even more preferably 70 or less. By satisfying the aforementioned ISC value, a display system with excellent visibility can be achieved. Specifically, by satisfying the aforementioned ISC value, diffuse light generation can be suppressed in the lens section, thereby suppressing image blurring. The ISC value can serve as an indicator of smoothness or unevenness. Furthermore, the ISC value of the assembly formed by arranging the three first laminated sections can serve as an indicator of the overall visibility of the display system. Since light passes through the first laminated section three times in the display system, the first laminated section significantly affects the visibility of the display system. In the example shown in Figure 2, for example, from the viewpoint of ease of evaluation, the first laminated section 100 includes a member located further behind the space formed between the first lens section 16 and the reflective polarizing member 14. Specifically, the first laminate 100 includes: an adhesive layer 41, a second phase difference member 22 including the second λ / 4 member 22a, the adhesive layer 42, and a first protective member 31. In fact, the lower limit of the ISC value of the assembly formed by arranging the three first laminates is about 5.

[0061] In the example shown in Figure 2, the components disposed between the first lens section 16 and the second lens section 24 are integrally formed on the first lens section 16 or the second lens section 24, thereby using 6 adhesive layers 41 to 46. In the example shown in Figure 2, the first lamination section 100 contains 2 adhesive layers. For example, the number of adhesive layers contained in the first lamination section 100 may vary depending on the number of components disposed between the first lens section 16 and the reflective polarizing member 14. The number of adhesive layers contained in the first lamination section is preferably 3 or less, and more preferably 2 or less. According to the above configuration, the above-mentioned ISC value can be well achieved in the first lamination section.

[0062] The thickness of the adhesive layer used for the lamination of the aforementioned components can be set to any suitable thickness. The thickness of the adhesive layer used for the lamination of the aforementioned components is preferably 20µm or less, but can be 15µm or less, 10µm or less, or 7µm or less. Depending on the thickness, the unevenness of the adhesive layer surface can be suppressed, and the aforementioned ISC value can be well achieved in the first lamination portion. On the other hand, the thickness of the adhesive layer can be, for example, 3µm or more.

[0063] The surface roughness Ra of each adhesive layer used in the lamination of the above-mentioned components should preferably be 20 nm or less, and more preferably 15 nm or less. Based on the aforementioned thickness, the above-mentioned ISC value can be well achieved in the first lamination portion.

[0064] The adhesive layer can be composed of any suitable adhesive. Specific examples include acrylic adhesives, rubber adhesives, polysiloxane adhesives, polyester adhesives, carbamate adhesives, epoxy adhesives, and polyether adhesives. By adjusting the type, quantity, combination, and blending ratio of monomers in the base resin forming the adhesive, as well as the amount of crosslinking agent, reaction temperature, and reaction time, an adhesive with desired properties can be formulated. The base resin of the adhesive can be used alone or in combination of two or more. Acrylic resins are preferred as the base resin. Specifically, the adhesive layer is preferably composed of acrylic adhesives.

[0065] For example, an adhesive layer can be formed by applying an adhesive composition containing a base resin, crosslinking agents, additives, and solvents, and then drying it. The adhesive composition can be applied directly to the substrate or to a separately prepared substrate such as a film. Drying is typically carried out by heating.

[0066] For example, the surface roughness Ra can be satisfied by adjusting the thickness of the adhesive coating. If the film thickness is too thick, heating will cause liquid flow due to the temperature difference in the coating, resulting in an adhesive layer with a large degree of surface unevenness.

[0067] For example, the aforementioned surface roughness Ra can be satisfied by controlling the drying conditions of the adhesive composition coating film. Specifically, the surface roughness Ra can be satisfied by adjusting the airflow and velocity of the air blown onto the coating film during drying. If the airflow and velocity of the air blown onto the coating film are too high, waves will be generated on the coating film, resulting in an adhesive layer with a large surface unevenness. In one embodiment, it is preferable to dry the coating film at a temperature of 65°C to 110°C with the airflow adjusted to a range of 2 m / min to 15 m / min, and more preferably to 2 m / min to 8 m / min. For example, it is preferable to adjust the temperature and airflow to the aforementioned level near the inlet of the drying oven after coating. Specifically, the temperature and airflow can be adjusted from the oven inlet to the center of the oven.

[0068] Each adhesive layer used in the lamination of the aforementioned components should preferably be a single-layer structure. For example, each adhesive layer should not have a multi-layer structure formed by applying the adhesive composition more than twice. By constructing the adhesive layers as single-layer structures, the aforementioned surface roughness Ra can be satisfied, for example.

[0069] Example The present invention will now be specifically described by way of examples, but the present invention is not limited to these examples. Furthermore, the thickness, surface roughness Ra, and phase difference values ​​are values ​​measured using the methods described below. <Thickness> Thicknesses less than 10µm were measured using a scanning electron microscope (manufactured by Nippon Electron Ltd., product name "JSM-7100F"). Thicknesses greater than 10µm were measured using a digital micrometer (manufactured by Anritsu Ltd., product name "KC-351C"). <Surface Roughness Ra> The arithmetic mean surface roughness Ra (µm) was determined in accordance with JIS B 0601 (1994 edition). The adhesive layer of the test object was bonded to a glass plate (MATSUNAMI, MICRO SLIDE GLASS, model S, 1.3 mm thick, 45 mm × 50 mm) to prepare the test sample. The bonding of the adhesive layer was achieved by transferring the adhesive layer formed on the substrate film from the substrate film to the glass plate. The resulting test sample was measured using a scanning white interferometer (Zygo, product name "Newview 7300"). Specifically, the test sample was placed on a test stage with a vibration damping platform, and interference fringes were generated using a single white LED illumination. An interferometer objective lens (2.5x magnification) with a reference plane was scanned along the Z-direction (thickness direction) to selectively obtain the smoothness (surface smoothness) of the outermost surface of the adhesive layer within a 2 mm□ field of view. The arithmetic mean surface roughness Ra was calculated based on this measurement. <Phase Difference> The phase difference at various wavelengths was measured using a Mueller matrix polarimeter (manufactured by Axometrics, product name "Axoscan") at 23°C.

[0070] [Example 1] (Formation of the adhesive layer) A monomer mixture containing 92 parts by weight of butyl acrylate, 2.9 parts by weight of acrylic acid, 0.1 parts by weight of 2-hydroxyethyl acrylate, and 5 parts by weight of N-acryloylmorpholine was fed into a four-necked flask equipped with a stirring blade, thermometer, nitrogen inlet pipe, and cooler. 0.1 parts by weight of 2,2'-azobisisobutyronitrile (2,2'-azobisisobutyronitrile), used as a polymerization initiator, and 200 parts by weight of ethyl acetate were added to each 100 parts by weight of the monomer mixture. Nitrogen was introduced into the flask while stirring slowly to induce nitrogen substitution. The liquid temperature in the flask was maintained at approximately 55°C, and the polymerization reaction was carried out for 8 hours to prepare a solution of an acrylic polymer with a weight average molecular weight (Mw) of 1.78 million. An acrylic polymer solution is applied to a substrate film, and the resulting coating is dried in an oven to form an adhesive layer with a thickness of 5 µm and a surface roughness Ra of 12 nm. The air velocity inside the oven, from the inlet to the center, is adjusted to be below 15 m / min during drying. The air velocity is measured using an anemometer installed inside the oven.

[0071] (Fabrication of λ / 4 components) Polymerization was carried out using a batch polymerization apparatus consisting of two vertical reactors equipped with stirring blades and reflux coolers controlled at 100°C. 29.60 parts by mass (0.046 mol) of bis[9-(2-phenoxycarbonylethyl)en-9-yl]methane, 29.21 parts by mass (0.200 mol) of isosorbide (ISB), 42.28 parts by mass (0.139 mol) of spiroglycerol (SPG), 63.77 parts by mass (0.298 mol) of diphenyl carbonate (DPC), and 1.19 × 10⁻² parts by mass (6.78 × 10⁻⁵ mol) of calcium acetate monohydrate as a catalyst were fed into the reactor. After depressurization and nitrogen substitution, the reactor was heated with a hot medium, and stirring was initiated at the point when the internal temperature reached 100°C. Forty minutes after the start of heating, the internal temperature was brought to 220°C. While maintaining this temperature, pressure was reduced, and after reaching 220°C, the pressure was lowered to 13.3 kPa over 90 minutes. Phenol vapor, a byproduct of the polymerization reaction, was introduced into a 100°C reflux cooler to return a small amount of monomeric components to the reactor, and uncondensed phenol vapor was recovered in a 45°C condenser. Nitrogen was introduced into the first reactor to temporarily restore it to atmospheric pressure, and the oligomerized reaction liquid in the first reactor was transferred to the second reactor. Next, heating and depressurization were initiated in the second reactor, and the internal temperature was brought to 240°C and the pressure to 0.2 kPa over 50 minutes. Polymerization was then carried out until the predetermined stirring power was reached. At the point where the predetermined power was reached, nitrogen was introduced into the reactor to restore the pressure, and the resulting polyester carbonate resin was extruded into water and cut into bundles to obtain pellets.

[0072] The obtained polyester carbonate resin (granules) was vacuum dried at 80°C for 5 hours. Then, a film-forming apparatus with a thickness of 135 μm was used, consisting of a single-shaft extruder (manufactured by Toshiba Machinery, cylinder set temperature: 250°C), a T-die (200 mm wide, set temperature: 250°C), a cooling roller (set temperature: 120~130°C), and a winding machine, to produce a long strip resin film with a thickness of 135 μm. The obtained long strip resin film was then stretched in the width direction at a stretching temperature of 143°C and a stretch ratio of 2.8 times to obtain a stretched film with a thickness of 47 μm. The Re(550) of the obtained stretched film was 143 nm, the Re(450) / Re(550) ratio was 0.86, and the Nz coefficient was 1.2.

[0073] (The formation of the positive C plate) A liquid crystal coating solution was prepared by dissolving 20 parts by weight of a side-chain liquid crystal polymer as shown in the following chemical formula (1) (where the numbers 65 and 35 represent the moles of monomer units, and for expedient purposes are block polymers with a weight average molecular weight of 5000), 80 parts by weight of a polymerizable liquid crystal exhibiting a nematic liquid crystal phase (BASF: trade name Paliocolor LC242), and 5 parts by weight of a photopolymerization initiator (Ciba Specialty Chemicals: trade name IRGACURE 907) in 200 parts by weight of cyclopentanone. The liquid crystal coating solution was then applied to a PET substrate that had undergone vertical orientation treatment using a bar coater and dried at 80°C for 4 minutes to orient the liquid crystal. The liquid crystal layer was then irradiated with ultraviolet light to harden it, thereby forming a positive C-plate on the substrate with a thickness of 4 µm and an Rth (550) of -100 nm. [Chemical Formula 1]

[0074] (Fabrication of protective components) The following hard coating forming material is applied to an acrylic film (40µm thick) with an lactone ring structure and heated at 90°C for 1 minute. The heated coating layer is then irradiated with ultraviolet light with a cumulative light intensity of 300mJ / cm2 using a high-pressure mercury lamp to harden the coating layer, thereby producing an acrylic film (44µm thick) with a hard coating layer of 4µm thickness. Next, the antireflective coating solution A is applied to the hardened coating layer using a wire rod, and the applied coating solution is heated at 80°C for 1 minute to dry it, thus forming a coating film. The dried coating film is then irradiated with ultraviolet light with a cumulative light intensity of 300 mJ / cm2 using a high-pressure mercury lamp to harden the coating film, thus forming an antireflective layer A with a thickness of 140 nm. Next, the antireflective layer forming solution B is applied to the antireflective layer A using a wire rod, and the applied solution is heated at 80°C for 1 minute to dry it, thus forming a coating film. The dried coating film is then irradiated with ultraviolet light with a cumulative light intensity of 300 mJ / cm2 using a high-pressure mercury lamp to harden the coating film, forming an antireflective layer B with a thickness of 105 nm. The protective component (44µm thick) is obtained in the manner described above.

[0075] (Hard coating forming material) A hard coating forming material was prepared by mixing 50 parts of a carbamate acrylate oligomer (manufactured by Shin-Nakamura Chemical Co., Ltd., "NK Oligo UA-53H"), 30 parts of a multifunctional acrylate with neopentyl terephthalate triacrylate as the main component (manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name "Viscoat #300"), 20 parts of 4-hydroxybutyl acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd.), 1 part of a leveling agent (manufactured by DIC Co., Ltd., "GRANDIC PC4100"), and 3 parts of a photopolymerization initiator (manufactured by Ciba Japan Co., Ltd., "IRGACURE 907"), and diluting the solid components with methyl isobutyl ketone to a concentration of 50%.

[0076] (Coating solution A for forming antireflective layer) A mixture of 100 parts by weight of a multifunctional acrylate (manufactured by Arakawa Chemical Industry Co., Ltd., trade name "OPSTAR KZ6728", solids content 20% by weight), 3 parts by weight of a leveling agent (manufactured by DIC Corporation, "GRANDIC PC4100"), and 3 parts by weight of a photopolymerization initiator (manufactured by BASF Corporation, trade name "OMNIRAD907", solids content 100% by weight) was prepared. Butyl acetate was used as a diluent in this mixture to bring the solids content to 12% by weight, and the mixture was stirred to prepare an antireflective coating solution A.

[0077] (Coating solution B for forming antireflective layer) The mixture consists of 100 parts by weight of a polyfunctional acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name "Viscoat #300", solid content 100 wt%), mainly composed of neopentyl terephthalate triacrylate; 150 parts by weight of hollow silica nanoparticles (manufactured by Nichibukai Chemical Industry Co., Ltd., trade name "THRULYA 5320", solid content 20 wt%, weight average particle size 75 nm); 50 parts by weight of solid silica nanoparticles (manufactured by Nissan Chemical Industry Co., Ltd., trade name "MEK-2140Z-AC", solid content 30 wt%, weight average particle size 10 nm); 12 parts by weight of a fluorine-containing additive (manufactured by Shin-Etsu Chemical Industry Co., Ltd., trade name "KY-1203", solid content 20 wt%); and 3 parts by weight of a photopolymerization initiator (manufactured by BASF, trade name "OMNIRAD907", solid content 100 wt%). To this mixture, a mixed solvent consisting of TBA (tert-butanol), MIBK (methyl isobutyl ketone), and PMA (propylene glycol monomethyl ether acetate) in a weight ratio of 60:25:15 is added as a diluent to make the total solid content 4% by weight, and the mixture is stirred to prepare an antireflective coating solution B.

[0078] (First layer) The positive C plate is bonded to the λ / 4 member (extended film) using an ultraviolet-curing adhesive (cured to a thickness of 1µm) to obtain a phase difference member. The obtained phase retardation component is bonded to a glass plate (MATSUNAMI, MICRO SLIDE GLASS, model S, 1.3 mm thick, 180 mm × 250 mm) through the aforementioned 5 µm thick adhesive layer. Here, the bonding is performed such that the positive C-plate of the phase retardation component is located on the side of the glass plate. Next, the protective member is bonded to the phase retardation member through the aforementioned 5µm thick adhesive layer, thus obtaining a first laminated portion on the glass plate. Here, the acrylic film of the protective member is bonded to the phase retardation member side.

[0079] (Fabrication of Absorption-Type Polarizing Film) The thermoplastic resin substrate is a strip-shaped amorphous polyethylene terephthalate (PET) copolymer film (thickness: 100µm) with a water absorption rate of 0.75% and a Tg of approximately 75°C. One side of the resin substrate was subjected to corona treatment. 13 parts by weight of potassium iodide were added to 100 parts by weight of a PVA-based resin made by mixing polyvinyl alcohol (degree of polymerization 4200, degree of saponification 99.2 moles) and acetoacetyl-modified PVA (manufactured by Mitsubishi Chemical Co., trade name "GOHSENX Z410") in a 9:1 ratio, and the resulting solution was dissolved in water to prepare a PVA aqueous solution (coating solution). The above-mentioned PVA aqueous solution is coated on the corona-treated surface of the resin substrate and dried at 60°C to form a PVA-based resin layer with a thickness of 13μm, thereby producing a laminate. The resulting laminate is subjected to free-end uniaxial stretching of 2.4 times in the longitudinal direction (long side direction) between rollers with different circumferential speeds in an oven at 130°C (air-assisted stretching process). Next, the laminate is immersed in an insoluble bath (an aqueous solution of boric acid prepared by mixing 4 parts by weight of boric acid with 100 parts by weight of water) at a liquid temperature of 40°C for 30 seconds (insoluble treatment). Next, the polarizing film is immersed in a dyeing bath at 30°C (an iodine aqueous solution obtained by mixing iodine and potassium iodide in a weight ratio of 1:7 relative to 100 parts by weight of water) for 60 seconds while adjusting the concentration, so that the monomer transmittance (Ts) of the final polarizing film is 42.0% or higher (dyeing treatment). Next, it is immersed in a crosslinking bath at a liquid temperature of 40°C (a boric acid aqueous solution obtained by mixing 3 parts by weight of potassium iodide and 5 parts by weight of boric acid relative to 100 parts by weight of water) for 30 seconds (crosslinking treatment). Then, while immersing the laminate in a boric acid aqueous solution (boric acid concentration 4 wt%, potassium iodide concentration 5 wt%) at a liquid temperature of 70°C, it is uniaxially stretched in the longitudinal direction (long side direction) between rollers with different circumferential speeds to achieve a total stretch ratio of 5.5 times (water stretching treatment). Then, the laminate is immersed in a washing bath at a temperature of 20°C (an aqueous solution of 4 parts by weight of potassium iodide mixed with 100 parts by weight of water) (washing treatment). Subsequently, while drying in an oven maintained at 90°C, the surface of the laminate is kept at 75°C by SUS heating rollers for approximately 2 seconds (drying shrinkage treatment). The width shrinkage rate of the laminate obtained by the drying shrinkage treatment is 5.2%. Through the above steps, a polarizing film (absorption type polarizing film) with a thickness of 5μm is formed on the resin substrate.

[0080] (Second layer) The above-mentioned absorptive polarizing film (manufactured by MATSUNAMI, MICRO SLIDE GLASS, model S, thickness 1.3 mm, 180 mm × 250 mm) is bonded to a glass plate through the 5 µm thick adhesive layer. Next, through the aforementioned 5µm thick adhesive layer, the reflective axis of the reflective polarizing film and the absorption axis of the absorptive polarizing film are arranged to be parallel to each other, and the reflective polarizing film ("APCF" manufactured by Nitto Denko Corporation) is attached to the absorptive polarizing film. Next, the protective member is bonded to the reflective polarizing film to obtain a second laminate on the glass plate. Here, the acrylic film of the protective member is bonded so that it is located on the reflective polarizing film side.

[0081] [Example 2] Except for using the adhesive layer shown below, the first laminated portion and the second laminated portion are obtained in the same manner as in Example 1. (Formation of the adhesive layer) A monomer mixture containing 94.9 parts by weight of butyl acrylate, 5 parts by weight of acrylic acid, and 0.1 parts by weight of 2-hydroxyethyl acrylate was fed into a four-necked flask equipped with a stirring blade, thermometer, nitrogen inlet pipe, and cooler. Simultaneously, 0.3 parts by weight of dibenzoyl peroxide (as a polymerization initiator) and ethyl acetate were added to each 100 parts by weight of the monomer mixture. Nitrogen was introduced while stirring slowly to induce nitrogen substitution in the flask, and the liquid temperature was maintained at 60°C for 7 hours for polymerization. Then, ethyl acetate was added to the resulting reaction solution to adjust the solids concentration to 30% by weight, thus preparing an acrylic polymer solution with a weight average molecular weight (Mw) of 2.2 million. An acrylic adhesive was prepared by mixing 0.6 parts by weight of trimethylolpropane / toluene diisocyanate adduct (trade name: Coronate L, manufactured by Tosoh Corporation) and 0.075 parts by weight of silane coupling agent (trade name: KBM403, manufactured by Shin-Etsu Chemical Co., Ltd.) with 100 parts by weight of the solid component of the obtained acrylic polymer solution. The obtained acrylic adhesive liquid was applied to a substrate film, and the coating film on the substrate film was dried in an oven to form an adhesive layer with a thickness of 15µm and a surface roughness Ra of 16nm. In addition, the air velocity inside the oven from the oven inlet to the center of the oven was adjusted to be below 15m / min for drying.

[0082] [Comparative Example 1] When forming the adhesive layer, the air velocity inside the oven is adjusted to be within the range of 15 m / min or less to form an adhesive layer with a thickness of 15 µm and a surface roughness Ra of 22 nm. Otherwise, the first lamination portion and the second lamination portion are obtained in the same manner as in Example 2.

[0083] [Comparative Example 2] When forming the adhesive layer, the coating thickness of the acrylic adhesive was changed, and the air speed in the oven was adjusted to be within the range of 15 m / min or less, so as to form an adhesive layer with a thickness of 23 µm and a surface roughness Ra of 29 nm. Otherwise, the first laminated part and the second laminated part were obtained in the same manner as in Example 2.

[0084] For the first stacked section in the embodiments and comparative examples, the ISC value was measured using an EyeScale-4W manufactured by i-system Co., Ltd. Specifically, according to the specifications of the measuring device, the in-plane non-uniformity of the first and second stacked sections was calculated as the ISC value using the ISC measurement mode of the 3CCD image sensor. Figure 4 is a diagram illustrating the method for measuring ISC values. It is a schematic diagram of the arrangement of the light source, the test sample, the screen, and the CCD camera viewed from above. As shown in Figure 4, the light source L, three first-layer stacked sections 100, and the screen S are arranged in sequence, and the transmitted image projected onto the screen S is measured by the CCD camera C. The test sample is made into an assembly of three first laminated sections 100 arranged together. The three first laminated sections 100 are arranged with an interval of 0.001~3mm between each other. As shown in Figure 4, the first laminated section 100 located closest to the light source L is configured such that the adjacent glass plate G is located on the side of the light source L. The first laminated section 100 located in the center is configured such that the adjacent glass plate G is located on the side of the screen S. The first laminated section 100 located closest to the screen S is configured such that the adjacent glass plate G is located on the side of the light source L. The distance along the X-axis from the light source L to the sample being measured is set to 10–60 cm. The distance along the X-axis from the light source L to the screen S is set to 70–130 cm. The distance along the Y-axis from the CCD camera C to the sample being measured is set to 3–30 cm. The distance along the X-axis from the CCD camera C to the screen S is set to 70–130 cm. Furthermore, for ease of viewing, detailed information about the first lamination section has been omitted from Figure 4. The measurement results are shown in Table 1.

[0085] For the embodiments and comparative examples, an optical lens (manufactured by Thorabs, trade name "LA1145") and a point light source (manufactured by Hamamatsu Photonics, model "L8425-01") were used to evaluate transmission (lens transmitted light). Specifically, the first and second stacked layers, cut into 45mm φ circles, were laminated on the flat side of the optical lens while being gently pressed sequentially with a hand roller to prevent foreign objects, air bubbles, or deformation streaks from entering the surface. Next, to remove the influence of micro-air bubbles, degassing was performed using a pressure degassing device (autoclave). The degassing conditions were set at 50°C, 0.5MPa, and 30 minutes. After degassing, the sample was allowed to cool naturally at room temperature for at least 30 minutes to obtain the test sample. A point light source, an optical lens (for measuring the sample), and a screen are set up in sequence. Light from the point light source passing through the optical lens is projected onto the screen, and the projection is evaluated. Here, a holding device is used to hold the lens at a position where the light from the point light source is incident from the convex side of the optical lens. The distance from the point light source to the screen is set to 1050 mm, and the distance from the optical lens to the screen is set to 130 mm. The light transmitted through the optical lens and projected onto the screen was observed with the naked eye, and the transmission was evaluated using the following evaluation criteria. The measurement results are shown in Table 1. (Evaluation Benchmark) • Good: No wrinkles or undulations visible. • Defects: Wrinkles and wavy undulations are visible.

[0086] [Table 1]

[0087] This invention is not limited to the above-described embodiments and can be modified in various ways. For example, it can be replaced by a configuration that is substantially the same as that shown in the above-described embodiments, a configuration that can perform the same function or effect, or a configuration that can achieve the same purpose.

[0088] Industrial availability The lens portion of this invention can be used, for example, in a display body such as a VR goggle.

[0089] 2: Display System 4: Lens section 12: Display element 12a: Display surface 14: Reflective polarizing component 14a: Multi-layer structure 16: First lens section 18: Semi-reflective mirror 20: First phase difference component 22: Second phase difference component 22a: Component 2λ / 4 22b: Positive C-plate 24: Second lens section 26: The User's Eyes 28: Absorption-type polarizing component 30: Third phase difference component 31: First protective component 32: Second protective component 41: Adhesive layer 42: Adhesive layer 43: Adhesive layer 44: Adhesive layer 45: Adhesive layer 46: Adhesive layer 100: First layered section 200: Second layered section A,B:layer C: CCD camera G: Glass plate L: Light source S: Screen

Claims

1. An optical component assembly comprising a polarizing component, a first λ / 4 component, a first laminated portion including a second λ / 4 component and at least one adhesive layer, and a reflective polarizing component; wherein the components of the aforementioned optical component assembly are configured such that light emitted forward from a display element sequentially passes through the aforementioned polarizing component, the aforementioned first λ / 4 component, the first lens portion and the aforementioned first laminated portion, is reflected by the aforementioned reflective polarizing component, then passes through the aforementioned first laminated portion, is reflected forward again, and sequentially passes through the aforementioned first laminated portion, the aforementioned reflective polarizing component and the second lens portion; the ISC value of the assembly formed by arranging three of the aforementioned first laminated portions is 100 or less.

2. The optical component assembly of claim 1, having a second laminated portion comprising the aforementioned reflective polarizing component.

3. The optical component assembly of claim 2, wherein the aforementioned first laminate and the aforementioned second laminate are arranged with a gap between them.

4. The optical component assembly of claim 2, wherein the aforementioned second laminated portion includes an absorptive polarizing component disposed between the aforementioned reflective polarizing component and the aforementioned second lens portion.

5. The optical component assembly of claim 2, wherein the aforementioned second laminated portion includes a third λ / 4 component disposed between the aforementioned reflective polarizing component and the aforementioned second lens portion.

6. The optical component assembly of claim 1, wherein the aforementioned first laminated portion includes a first protective member disposed in front of the aforementioned second λ / 4 component.

7. The optical component assembly of claim 1, wherein the adhesive layer contained in the aforementioned first laminate portion is 3 layers or less.

8. The optical component assembly of claim 1, wherein the thickness of each adhesive layer contained in the aforementioned first laminate portion is 20µm or less.

9. The optical component assembly of claim 1, wherein the surface roughness Ra of each adhesive layer contained in the aforementioned first laminate portion is 20 nm or less.

10. The optical component assembly of claim 1, wherein each adhesive layer contained in the aforementioned first laminate portion is a single layer.

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