Representation method

Abstract

To provide a lens component that enables lighter weight and higher resolution for VR goggles. [Solution] The display method according to an embodiment of the present invention includes the steps of: passing light representing an image emitted through a polarizing member and a first λ / 4 member through a half mirror and a first lens portion; passing the light that has passed through the half mirror and the first lens portion through a second λ / 4 member; reflecting the light that has passed through the second λ / 4 member toward the half mirror with a reflective portion including a reflective polarizing member; making the light reflected by the reflective portion and the half mirror permeable to the reflective polarizing member of the reflective portion by the second λ / 4 member; and passing the light that has passed through the reflective polarizing member through an absorbing polarizing member, wherein the absorbing polarizing member reduces the transmission axis reflectance by 0.5% or more when polarization in the transmission axis direction of the reflective polarizing member is incident from the reflective polarizing member side.

Description

Technical Field

[0001] The present invention relates to a display method.

Background Art

[0002] Image display devices typified by liquid crystal display devices and electroluminescence (EL) display devices (e.g., organic EL display devices) have been rapidly spreading. In image display devices, in order to realize image display and enhance the performance of image display, generally, optical members such as polarizing members and retardation members are used (see, for example, Patent Document 1).

[0003] In recent years, new applications of image display devices have been developed. For example, goggles with a display (VR goggles) for realizing Virtual Reality (VR) have started to be commercialized. Since VR goggles are being considered for use in various scenarios, weight reduction, high definition, etc. are desired. Weight reduction can be achieved, for example, by thinning the lenses used in VR goggles. On the other hand, the development of optical members suitable for a display system using thin lenses is also desired.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In view of the above, the main object of the present invention is to provide a lens unit that can achieve weight reduction and high definition of VR goggles.

Means for Solving the Problems

[0006] 1. A display method according to an embodiment of the present invention includes the steps of: passing light representing an image emitted through a polarizing member and a first λ / 4 member through a half mirror and a first lens portion; passing the light that has passed through the half mirror and the first lens portion through a second λ / 4 member; reflecting the light that has passed through the second λ / 4 member toward the half mirror with a reflective portion including a reflective polarizing member; making the light reflected by the reflective portion and the half mirror permeable to the reflective polarizing member of the reflective portion by the second λ / 4 member; and passing the light that has passed through the reflective polarizing member through an absorbing polarizing member, wherein the absorbing polarizing member reduces the transmission axis reflectance by 0.5% or more when polarization in the transmission axis direction of the reflective polarizing member is incident from the reflective polarizing member side. 2. In the display method described in item 1 above, the reflection axis of the reflective polarizing member and the absorption axis of the absorptive polarizing member may be arranged parallel to each other. 3. In the display method described in 1 or 2 above, the first lens portion and the half mirror may be provided integrally. 4. The display method described in any of items 1 to 3 above may include the step of passing the light that has passed through the reflective polarizing member through the second lens portion. 5. In the display method described in any of items 1 to 4 above, the angle between the absorption axis of the polarizing member and the slow axis of the first λ / 4 member may be 40° to 50°, and the angle between the absorption axis of the polarizing member and the slow axis of the second λ / 4 member may be 40° to 50°. 6. In the display method described in any of items 1 to 5 above, the reflective portion may have a laminate of the reflective polarizing member and the absorbing polarizing member. 7. In the display method described in 6 above, the reflective polarizing member and the absorptive polarizing member may be laminated with an adhesive layer in between. [Effects of the Invention]

[0007] According to the lens portion of the embodiment of the present invention, it is possible to achieve lighter weight and higher resolution for VR goggles. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram showing the general configuration of a display system according to one embodiment of the present invention. [Figure 2] Figure 1 is a schematic cross-sectional view showing an example of a laminate used in the reflective section of the display system. [Figure 3] This is a schematic perspective view showing an example of a multilayer structure contained in a reflective polarizing film. [Modes for carrying out the invention]

[0009] The embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments. In addition, the drawings may schematically represent the width, thickness, shape, etc. of each part in order to make the explanation clearer, but these are merely examples and do not limit the interpretation of the present invention.

[0010] (Definitions of terms and symbols) The definitions of terms and symbols used in this specification are as follows: (1) Refractive index (nx, ny, nz) "nx" is the refractive index in the direction where the refractive index is maximum in the plane (i.e., the slow phase axis direction), "ny" is the refractive index in the direction perpendicular to the slow phase axis in the plane (i.e., the fast phase 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 with light of wavelength λnm at 23°C. For example, "Re(550)" is the in-plane phase difference measured with light of wavelength 550nm at 23°C. Re(λ) can be calculated using the formula: Re(λ) = (nx - ny) × d, where d (nm) is the thickness of the layer (film). (3) Phase difference in the thickness direction (Rth) "Rth(λ)" is the phase difference in the thickness direction measured with light of wavelength λnm at 23°C. For example, "Rth(550)" is the phase difference in the thickness direction measured with light of wavelength 550nm at 23°C. Rth(λ) can be calculated using the formula: Rth(λ) = (nx - nz) × d, where d (nm) is the thickness of the layer (film). (4) Nz coefficient The Nz coefficient is calculated using the formula Nz = Rth / Re. (5)Angle In this specification, when an angle is referred to, it encompasses both clockwise and counterclockwise directions with respect to the reference direction. Therefore, for example, "45°" means ±45°.

[0011] Figure 1 is a schematic diagram showing the general configuration of a display system according to one 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 comprises a display element 12, a reflector 14, a first lens 16, a half mirror 18, a first phase difference member 20, a second phase difference member 22, and a second lens 24. The reflector 14 is positioned in front of the display element 12 on the display surface 12a side and can reflect light emitted from the display element 12. The first lens 16 is positioned in the optical path between the display element 12 and the reflector 14, and the half mirror 18 is positioned between the display element 12 and the first lens 16. The first phase difference member 20 is positioned in the optical path between the display element 12 and the half mirror 18, and the second phase difference member 22 is positioned in the optical path between the half mirror 18 and the reflector 14.

[0012] The components positioned in front of the half-mirror (in the illustrated example, the half-mirror 18, the first lens section 16, the second phase difference member 22, the reflecting section 14, and the second lens section 24) are sometimes collectively referred to as the lens section (lens section 4).

[0013] The display element 12 is, for example, a liquid crystal display or an organic EL display, and has a display surface 12a for displaying an image. The light emitted from the display surface 12a is emitted, for example, after passing through a polarizing member (typically, a polarizing film) that may be included in the display element 12, and is made into first linearly polarized light.

[0014] The first retardation member 20 is a λ / 4 member that can convert the first linearly polarized light incident on the first retardation member 20 into first circularly polarized light (hereinafter, the first retardation member may be referred to as the first λ / 4 member). Note that the first retardation member 20 may be provided integrally with the display element 12.

[0015] The half mirror 18 transmits the light emitted from the display element 12 and reflects the light reflected by the reflection part 14 toward the reflection part 14. The half mirror 18 is provided integrally with the first lens part 16.

[0016] The second retardation member 22 is a λ / 4 member that can transmit the light reflected by the reflection part 14 and the half mirror 18 through the reflection part 14 including a reflective polarizing member (hereinafter, the second retardation member may be referred to as the second λ / 4 member). Note that the second retardation member 22 may be provided integrally with the first lens part 16.

[0017] The first circularly polarized light emitted from the first λ / 4 member 20 passes through the half mirror 18 and the first lens part 16, and is converted into second linearly polarized light by the second λ / 4 member 22. The second linearly polarized light emitted from the second λ / 4 member 22 is reflected toward the half mirror 18 without passing through the reflective polarizing member included in the reflection part 14. At this time, the polarization direction of the second linearly polarized light incident on the reflective polarizing member included in the reflection part 14 is the same as the reflection axis of the reflective polarizing member. Therefore, the second linearly polarized light incident on the reflection part is reflected by the reflective polarizing member.

[0018] The second linearly polarized light reflected by the reflecting section 14 is converted into a second circularly polarized light by the second λ / 4 member 22, and the second circularly polarized light emitted from the second λ / 4 member 22 passes through the first lens section 16 and is reflected by the half mirror 18. The second circularly polarized light reflected by the half mirror 18 passes through the first lens section 16 and is converted into a third linearly polarized light by the second λ / 4 member 22. The third linearly polarized light is transmitted through the reflective polarizing member included in the reflecting section 14. At this time, the polarization direction of the third linearly polarized light incident on the reflective polarizing member included in the reflecting section 14 is in the same direction as the transmission axis of the reflective polarizing member. Therefore, the third linearly polarized light incident on the reflecting section 14 is transmitted through the reflective polarizing member.

[0019] Light that has passed through the reflective section 14 passes through the second lens section 24 and enters the user's eye 26.

[0020] For example, the absorption axis of the polarizing member included in the display element 12 and the reflection axis of the reflective polarizing member included in the reflection section 14 may be arranged substantially parallel to each other or substantially orthogonal to each other. The angle between the absorption axis of the polarizing member included in the display element 12 and the lagging axis of the first phase difference member 20 may be, for example, 40° to 50°, but may also be 42° to 48°, or approximately 45°. The angle between the absorption axis of the polarizing member included in the display element 12 and the lagging axis of the second phase difference member 22 may be, for example, 40° to 50°, but may also be 42° to 48°, or approximately 45°.

[0021] The in-plane phase difference Re(550) of the first phase difference member 20 is, for example, 100 nm to 190 nm, but may also be 110 nm to 180 nm, 130 nm to 160 nm, or 135 nm to 155 nm.

[0022] The first phase difference member 20 preferably exhibits an inverse dispersion wavelength characteristic in which the phase difference value increases with the wavelength of the measured light. The Re(450) / Re(550) of the first phase difference member 20 is, for example, 0.75 or more and less than 1, and may be 0.8 or more and 0.95 or less.

[0023] The in-plane phase difference Re(550) of the second phase difference member 22 is, for example, 100 nm to 190 nm, but may also be 110 nm to 180 nm, 130 nm to 160 nm, or 135 nm to 155 nm.

[0024] The second phase difference member 22 preferably exhibits an inverse dispersion wavelength characteristic in which the phase difference value increases with the wavelength of the measured light. The Re(450) / Re(550) of the second phase difference member 22 is, for example, 0.75 or more and less than 1, and may be 0.8 or more and 0.95 or less.

[0025] The reflective portion 14 may include an absorptive polarizing member in addition to the reflective polarizing member. The absorptive polarizing member may be positioned in front of the reflective polarizing member. The reflection axis of the reflective polarizing member and the absorption axis of the absorptive polarizing member may be positioned substantially parallel to each other, and the transmission axis of the reflective polarizing member and the transmission axis of the absorptive polarizing member may be positioned substantially parallel to each other. If the reflective portion 14 includes an absorptive polarizing member, the reflective portion 14 may include a laminate having the reflective polarizing member and the absorptive polarizing member.

[0026] Figure 2 is a schematic cross-sectional view showing an example of a laminate used in the reflective portion of the display system shown in Figure 1. The laminate 30 includes a reflective polarizing member 32 and an absorptive polarizing member 34, and the reflective polarizing member 32 and the absorptive polarizing member 34 are laminated with an adhesive layer 36 in between. By using the adhesive layer, the reflective polarizing member 32 and the absorptive polarizing member 34 are fixed, and misalignment of the axial arrangement between the reflective axis and the absorptive axis (transmission axis and transmission axis) can be prevented. In addition, adverse effects due to the air layer that may be formed between the reflective polarizing member 32 and the absorptive polarizing member 34 can be suppressed. The adhesive layer 36 may be formed of an adhesive or a tack. The thickness of the adhesive layer 36 is, for example, 0.05 μm to 30 μm, preferably 3 μm to 20 μm, and more preferably 5 μm to 15 μm.

[0027] The above-described reflective polarizing member transmits polarized light parallel to its transmission axis (typically linearly polarized light) while maintaining its polarization state, and reflects light in other polarization states. Typically, the reflective polarizing member is composed of a multilayer film (sometimes referred to as a reflective polarizing film). In this case, the thickness of the reflective polarizing member is, for example, 10 μm to 150 μm, preferably 20 μm to 100 μm, and more preferably 30 μm to 60 μm.

[0028] Figure 3 is a schematic perspective view showing an example of a multilayer structure included in a reflective polarizing film. The multilayer structure 32a alternates between layers A, which have birefringence, and layers B, which have substantially no birefringence. The total number of layers constituting the multilayer structure may be 50 to 1000. For example, the refractive index nx in the x-axis direction of layer A is greater than the refractive index ny in the y-axis direction, and the refractive index nx in the x-axis direction and the refractive index ny in the y-axis direction of layer B are substantially the same, so the refractive index difference between layer A and layer B is large in the x-axis direction and substantially zero in the y-axis direction. As a result, the x-axis direction can be the reflection axis and the y-axis direction can be the transmission axis. The refractive index difference between layer A and layer B in the x-axis direction is preferably 0.2 to 0.3.

[0029] The above-mentioned layer A is typically composed of a material that exhibits birefringence upon stretching. Examples of such materials include naphthalenedicarboxylic acid polyester (e.g., polyethylene naphthalate), polycarbonate, and acrylic resins (e.g., polymethyl methacrylate). The above-mentioned layer B is typically composed of a material that does not substantially exhibit birefringence upon stretching. Examples of such materials include a copolyester of naphthalenedicarboxylic acid and terephthalic acid. The above multilayer structure can be formed by a combination of co-extrusion and stretching. For example, the materials constituting layer A and layer B are extruded and then multilayered (e.g., using a multiplier). The resulting multilayer laminate is then stretched. The x-axis direction in the illustrated example may correspond to the stretching direction.

[0030] Examples of commercially available reflective polarizing films include the product names "DBEF" and "APF" from 3M, and "APCF" from Nitto Denko.

[0031] The orthogonal transmittance (Tc) of the reflective polarizing member (reflective polarizing film) may be, for example, 0.01% to 3%. The single-element transmittance (Ts) of the reflective polarizing member (reflective polarizing film) may be, for example, 43% to 49%, preferably 45% to 47%. The degree of polarization (P) of the reflective polarizing member (reflective polarizing film) may be, for example, 92% to 99.99%.

[0032] The above-mentioned absorption-type polarizing member may typically include a resin film containing a dichroic substance (sometimes referred to as an absorption-type polarizing film). The thickness of the absorption-type polarizing film is, for example, 1 μm or more and 20 μm or less, but may also be 2 μm or more and 15 μm or less, 12 μm or less, 10 μm or less, 8 μm or less, or 5 μm or less.

[0033] The above-mentioned absorption polarizing film may be made from a single layer of resin film, or it may be made using a laminate of two or more layers.

[0034] When manufactured from a single layer of resin film, for example, an absorption polarizing film can be obtained by subjecting a hydrophilic polymer film, such as a polyvinyl alcohol (PVA) film, a partially formalized PVA film, or a partially saponified ethylene-vinyl acetate copolymer film, to dyeing treatment with a dichroic substance such as iodine or a dichroic dye, and stretching treatment. Among these, an absorption polarizing film obtained by dyeing a PVA film with iodine and uniaxially stretching it is preferred.

[0035] The above iodine staining is carried out, for example, by immersing the PVA-based film in an iodine aqueous solution. The stretching ratio for the above uniaxial stretching is preferably 3 to 7 times. Stretching may be performed after the staining treatment, or during the staining process. Alternatively, staining may be performed after stretching. If necessary, the PVA-based film may be subjected to swelling, crosslinking, washing, drying, etc.

[0036] When using the above-mentioned laminate of two or more layers, examples of laminates include a laminate of a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or a laminate of a resin substrate and a PVA-based resin layer coated and formed on the resin substrate. An absorption polarizing film obtained using a laminate of a resin substrate and a PVA-based resin layer coated and formed on the resin substrate can be produced, for example, by applying a PVA-based resin solution to a resin substrate, drying it to form a PVA-based resin layer on the resin substrate, and obtaining a laminate of a resin substrate and a PVA-based resin layer; or by stretching and dyeing the laminate to make the PVA-based resin layer an absorption polarizing film. In this embodiment, preferably, a polyvinyl alcohol-based resin layer containing a halide and a polyvinyl alcohol-based resin is formed on one side of the resin substrate. Stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching it. Furthermore, stretching may, if necessary, further include air-stretching the laminate at a high temperature (e.g., 95°C or higher) before stretching in the aqueous boric acid solution. In addition, in this embodiment, the laminate is preferably subjected to a drying shrinkage treatment in which it shrinks by 2% or more in the width direction by heating while being transported in the longitudinal direction. Typically, the manufacturing method of this embodiment includes applying an air-assisted stretching treatment, a dyeing treatment, a water-based stretching treatment, and a drying shrinkage treatment to the laminate in this order. By introducing auxiliary stretching, it is possible to increase the crystallinity of PVA even when PVA is coated on a thermoplastic resin, making it possible to achieve high optical properties. At the same time, by increasing the orientation of PVA in advance, it is possible to prevent problems such as a decrease in the orientation of PVA and dissolution when immersed in water in the subsequent dyeing and stretching processes, making it possible to achieve high optical properties. Furthermore, when the PVA-based resin layer is immersed in a liquid, the disorder of the orientation of polyvinyl alcohol molecules and the decrease in orientation can be suppressed compared to when the PVA-based resin layer does not contain halides. As a result, the optical properties of the absorption polarizing film obtained through processing steps in which the laminate is immersed in a liquid, such as dyeing and water-based stretching, can be improved. Furthermore, by shrinking the laminate in the width direction through a drying shrinkage treatment, the optical properties can be improved.The resulting resin substrate / absorbent polarizing film laminate may be used as is (i.e., the resin substrate may be used as a protective layer for the absorbent polarizing film), or an appropriate protective layer may be laminated on the peeled surface obtained by removing the resin substrate from the resin substrate / absorbent polarizing film laminate, or on the surface opposite to the peeled surface, depending on the purpose. Details of such a method for manufacturing an absorbent polarizing film are described, 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.

[0037] The orthogonal transmittance (Tc) of the absorbing polarizing member (absorbing polarizing film) is preferably 0.5% or less, more preferably 0.1% or less, and even more preferably 0.05% or less. The single-layer transmittance (Ts) of the absorbing polarizing member (absorbing polarizing film) is, for example, 41.0% to 45.0%, and preferably 42.0% or more. The degree of polarization (P) of the absorbing polarizing member (absorbing polarizing film) is, for example, 99.0% to 99.997%, and preferably 99.9% or more.

[0038] The orthogonal transmittance (Tc) of the reflective portion is preferably 0.5% or less, more preferably 0.1% or less, and even more preferably 0.05% or less. By satisfying such orthogonal transmittance, the user's perception of afterimages (ghosting) can be suppressed, and excellent display characteristics can be achieved. The single-element transmittance (Ts) of the reflective portion is preferably 40.0% to 45.0%, and more preferably 41.0% or more. The polarization degree (P) of the reflective portion is preferably 99.0% to 99.997%, and more preferably 99.9% or more.

[0039] The transmission axis reflectance of the reflective portion (when polarized light in the direction of the transmission axis is incident on the reflective portion) is preferably 10% or less, but may also be 9% or less, 8% or less, or 7% or less. By satisfying such a transmission axis reflectance, the amount of depolarization component is reduced, the user's perception of afterimages (ghosting) can be suppressed, and excellent display characteristics can be achieved. Furthermore, the above orthogonal transmittance (Tc) can be achieved well.

[0040] The optical properties of the reflective portion may correspond to the optical properties of a reflective polarizing member, or to the optical properties of a laminate of a reflective polarizing member and an absorptive polarizing member. The optical properties of the reflective portion can be achieved very well by combining an absorptive polarizing member with a reflective polarizing member.

[0041] The transmission axis reflectance of a reflective polarizing member (when polarization in the transmission axis direction is incident on the reflective polarizing member) may be, for example, 7.5% or more. It may also be, for example, 9% or more. It may also be, for example, 11% or more. By using an absorptive polarizing member, it is preferable to reduce the transmission axis reflectance of the reflective portion by 0.5% or more, and it may be reduced by 1% or more, 2% or more, or 3% or more. [Examples]

[0042] The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. The thickness, single-element transmittance, orthogonal transmittance, and polarization degree are values ​​measured by the measurement methods described below. <Thickness> Thicknesses of 10 μm or less were measured using a scanning electron microscope (JEOL Ltd., product name "JSM-7100F"). Thicknesses exceeding 10 μm were measured using a digital micrometer (Anritsu Corporation, product name "KC-351C"). <Single-element transmittance, orthogonal transmittance, and polarization degree> For reflective polarizing films and absorbing polarizing films (absorbing polarizing films), the single-element transmittance Ts, parallel transmittance Tp, and orthogonal transmittance Tc were measured using a UV-Vis spectrophotometer (Otsuka Electronics Co., Ltd., "LPF200"). Ts, Tp, and Tc are Y values ​​obtained by measuring using a 2-degree field of view (C light source) according to JIS Z8701 and correcting for luminous sensitivity. Furthermore, the degree of polarization P was determined from the obtained Tp and Tc using the following formula. Polarization degree P(%)={(Tp-Tc) / (Tp+Tc)} 1 / 2 ×100

[0043] [Example 1-1] (Fabrication of polarizing film 1) As the thermoplastic resin substrate, an amorphous isophthalic copolymer polyethylene terephthalate film (thickness: 100 μm) in a long length, with a water absorption rate of 0.75% and a Tg of approximately 75°C was used. One side of the resin substrate was subjected to corona treatment. A PVA aqueous solution (coating solution) was prepared by dissolving 100 parts by weight of a PVA-based resin, which was prepared by mixing polyvinyl alcohol (degree of polymerization 4200, degree of saponification 99.2 mol%) and acetoacetyl-modified PVA (manufactured by Mitsubishi Chemical Corporation, trade name "Gosenex Z410") in a 9:1 ratio, with 13 parts by weight of potassium iodide. A PVA aqueous solution was applied to the corona-treated surface of a resin substrate and dried at 60°C to form a 13 μm thick PVA-based resin layer, thereby creating a laminate. The resulting laminate was uniaxially stretched 2.4 times in the longitudinal direction (longitudinal direction) between rolls with different peripheral speeds in an oven at 130°C (air-assisted stretching). Next, the laminate was immersed for 30 seconds in an insolubilization bath at a liquid temperature of 40°C (a boric acid aqueous solution obtained by mixing 4 parts by weight of boric acid with 100 parts by weight of water) (insolubilization treatment). Next, the polarizing film was immersed for 60 seconds in a staining bath at a liquid temperature of 30°C (an iodine aqueous solution obtained by mixing iodine and potassium iodide in a weight ratio of 1:7 with 100 parts by weight of water) while adjusting the concentration so that the final polarizing film's single-element transmittance (Ts) would be 42.0% or higher (staining treatment). Next, the material was immersed for 30 seconds 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 with 100 parts by weight of water) (crosslinking treatment). Subsequently, the laminate was immersed in a boric acid aqueous solution (boric acid concentration 4% by weight, potassium iodide concentration 5% by weight) at a liquid temperature of 70°C, and uniaxially stretched in the longitudinal direction (longitudinal direction) between rolls with different peripheral speeds to achieve a total stretch ratio of 5.5 times (underwater stretching treatment). Subsequently, the laminate was immersed in a washing bath at a liquid temperature of 20°C (an aqueous solution obtained by mixing 4 parts by weight of potassium iodide with 100 parts by weight of water) (washing treatment). Subsequently, the laminate was dried in an oven maintained at 90°C while being brought into contact with a SUS (stainless steel) heated roll with a surface temperature maintained at 75°C for approximately 2 seconds (drying shrinkage treatment). The shrinkage rate in the width direction of the laminate due to the drying shrinkage treatment was 5.2%. In this way, a polarizing film 1 (absorption polarizing film) with a thickness of 5 μm was formed on the resin substrate.

[0044] (Fabrication of suction-type polarizing films) A 25 μm thick cycloolefin resin film was bonded to the surface of the obtained absorbing polarizing film (the side of the laminate facing polarizing film 1) as a protective layer via an ultraviolet-curing adhesive. Specifically, the adhesive layer was coated to a thickness of approximately 1 μm after curing, and bonded using a roll press. The adhesive was then cured by irradiating it with UV light from the cycloolefin resin film side. Next, the resin substrate was peeled off to obtain an absorbing polarizing film having a cycloolefin resin film / absorbing polarizing film structure.

[0045] (Preparation of reflective film) A reflective polarizing film 1 (Ts: 46.8%, Tc: 1.54%, P: 96.4%) was bonded to an absorptive polarizing film via an adhesive so that the reflective axis of the reflective polarizing film 1 and the absorptive polarizing film were arranged parallel to each other, thereby obtaining a reflective film (laminated film).

[0046] [Examples 1-2 and 1-3] In the preparation of polarizing film 1, a reflective film was obtained in the same manner as in Example 1-1, except that the dyeing treatment conditions were changed.

[0047] [Examples 1-4] A reflective portion was obtained in the same manner as in Example 1-1, except that polarizing film 2 was used instead of polarizing film 1. (Fabrication of polarizing film 2) A 12 μm thick polarizing film 2 was fabricated by uniaxially stretching a 30 μm thick polyvinyl alcohol (PVA) resin film (manufactured by Kuraray, product name "PE3000") in the longitudinal direction using a roll stretching machine to 5.9 times its length, while simultaneously applying swelling, dyeing, crosslinking, and washing treatments in that order, and finally drying treatment. The above swelling treatment involved stretching the material 2.2 times while treating it with pure water at 20°C. Next, the dyeing treatment involved stretching the material 1.4 times while treating it in an aqueous solution at 30°C with an iodine-to-potassium iodide weight ratio of 1:7, where the iodine concentration was adjusted so that the resulting polarizing film had a transmittance of 42.0% or more. Next, the crosslinking treatment was performed in two stages. In the first stage, the material was stretched 1.2 times while treating it in an aqueous solution of boric acid and potassium iodide at 40°C. The boric acid content of the aqueous solution for the first stage of crosslinking was 5.0% by weight, and the potassium iodide content was 3.0% by weight. In the second stage of crosslinking, the material was stretched 1.6 times while treating it in an aqueous solution of boric acid and potassium iodide at 65°C. The boric acid content of the aqueous solution for the second stage of crosslinking was 4.3% by weight, and the potassium iodide content was 5.0% by weight. Next, the washing treatment was performed with an aqueous potassium iodide solution at 20°C. The potassium iodide content of the washing solution was 2.6% by weight. Finally, the polarizing film 2 was obtained by drying at 70°C for 5 minutes.

[0048] [Examples 1-5] In the preparation of polarizing film 2, a reflective film was obtained in the same manner as in Examples 1-4, except that the dyeing treatment conditions were changed.

[0049] [Examples 2-1 to 2-5] A reflective film was obtained in the same manner as in Examples 1-1 to 1-5, except that a reflective polarizing film 2 (Ts: 47.0%, Tc: 2.97%, P: 93.1%) was used instead of reflective polarizing film 1.

[0050] [Examples 3-1 to 3-5] A reflective film was obtained in the same manner as in Examples 1-1 to 1-5, except that a reflective polarizing film 3 (Ts: 45.7%, Tc: 0.011%, P: 99.97%) was used instead of reflective polarizing film 1.

[0051] [Comparative Example 1] A reflective polarizing film 1 (Ts: 46.8%, Tc: 1.54%, P: 96.4%) was used as the film for the reflective portion.

[0052] [Comparative Example 2] A reflective polarizing film 2 (Ts: 47.0%, Tc: 2.97%, P: 93.1%) was used as the film for the reflective portion.

[0053] [Comparative Example 3] A reflective polarizing film 3 (Ts: 45.7%, Tc: 0.011%, P: 99.97%) was used as the film for the reflective portion.

[0054] The following evaluations were conducted on the examples and comparative examples. The evaluation results are summarized in Table 1. <Rating> ·Transmission axis transmittance For the reflective film, the reflectance along the transmission axis was measured using an ultraviolet-visible-near-infrared spectrophotometer (Hitachi High-Tech Science Co., Ltd., "U-4100") by irradiating the reflective polarizing film contained in the reflective film from the reflective polarizing film side with polarization in the transmission axis direction.

[0055] [Table 1]

[0056] The present invention is not limited to the embodiments described above, and various modifications are possible. For example, the configurations shown in the embodiments above can be replaced with configurations that are substantially the same, configurations that produce the same effects, or configurations that can achieve the same purpose. [Industrial applicability]

[0057] The lens portion according to an embodiment of the present invention can be used, for example, in a display device such as VR goggles. [Explanation of Symbols]

[0058] 2 Display System 4. Lens section 12 Display elements 14 Reflector 16 First lens section 18 Half Mirror 20 First phase difference member 22 Second phase difference member 24 Second lens section 30-layer structure 32 Reflective polarizing member 34 Absorbing polarizing element 36 Adhesive layer

Claims

1. A reflective member used in the lens portion of VR goggles, which reflects light incident on the lens portion, The reflective member is a laminate including a reflective polarizing member and an absorbing polarizing member positioned in front of the reflective polarizing member. The reflectance along the transmission axis of the laminate of the reflective polarizing member and the absorbing polarizing member, when polarized light in the transmission axis direction of the reflective polarizing member is incident from the reflective polarizing member side, is reduced by 0.5% or more compared to when the absorbing polarizing member is not used. Reflective material.

2. The VR goggles are based on a display system in which light emitted forward from the display surface of an image-representing display element is transmitted through the lens to display an image to the user. The reflective member according to claim 1, wherein the light is reflected twice by the lens portion to display an image to the user.

3. The reflective member according to claim 2, wherein one of the two reflections in the lens portion is a reflection in the reflective member.

4. The reflective member according to claim 1, wherein the reflective polarizing member and the absorptive polarizing member are laminated with an adhesive layer in between.

5. The reflective member according to claim 1, wherein the reflection axis of the reflective polarizing member and the absorption axis of the absorptive polarizing member are arranged parallel to each other.

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