WO2023176658A1 - Unité de lentille et film stratifié - Google Patents

Unité de lentille et film stratifié Download PDF

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Publication number
WO2023176658A1
WO2023176658A1 PCT/JP2023/008965 JP2023008965W WO2023176658A1 WO 2023176658 A1 WO2023176658 A1 WO 2023176658A1 JP 2023008965 W JP2023008965 W JP 2023008965W WO 2023176658 A1 WO2023176658 A1 WO 2023176658A1
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WO
WIPO (PCT)
Prior art keywords
reflective polarizing
lens
polarizing member
light
less
Prior art date
Application number
PCT/JP2023/008965
Other languages
English (en)
Japanese (ja)
Inventor
理 小島
周作 後藤
Original Assignee
日東電工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2022077679A external-priority patent/JP2023166854A/ja
Priority claimed from JP2022077631A external-priority patent/JP2023134316A/ja
Priority claimed from JP2022077633A external-priority patent/JP2023166826A/ja
Priority claimed from JP2022077634A external-priority patent/JP2023166827A/ja
Priority claimed from JP2022077632A external-priority patent/JP2023166825A/ja
Priority claimed from JP2022077657A external-priority patent/JP2023134317A/ja
Priority claimed from JP2022077678A external-priority patent/JP2023166853A/ja
Priority claimed from JP2022077659A external-priority patent/JP2023166841A/ja
Priority claimed from JP2022077658A external-priority patent/JP2023166840A/ja
Priority claimed from JP2022077676A external-priority patent/JP2023166851A/ja
Priority claimed from JP2022077677A external-priority patent/JP2023166852A/ja
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Publication of WO2023176658A1 publication Critical patent/WO2023176658A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/02—Viewing or reading apparatus
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/344—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] with head-mounted left-right displays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/346—Image reproducers using prisms or semi-transparent mirrors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers

Definitions

  • the present invention relates to a lens portion and a laminated film.
  • Image display devices represented by liquid crystal display devices and electroluminescence (EL) display devices are rapidly becoming popular.
  • EL electroluminescence
  • optical members such as polarizing members and retardation members are generally used to realize image display and improve image display performance (see, for example, Patent Document 1).
  • the main purpose of the present invention is to provide a lens portion that can reduce the weight of VR goggles and improve visibility.
  • the lens unit according to the embodiment of the present invention is a lens unit used in a display system that displays an image to a user, and is a lens unit that emits light forward from a display surface of a display element that represents an image, and includes a polarizing member and a first a reflective polarizing member that reflects light that has passed through the ⁇ /4 member; a first lens portion disposed on an optical path between the display element and the reflective polarizing member; a half mirror that is disposed between the lens portion and transmits the light emitted from the display element and reflects the light reflected by the reflective polarizing member toward the reflective polarizing member; and the reflective polarizing member.
  • the protective member may have a 30° regular reflectance of 0.5% or less at a wavelength of 450 nm.
  • the protective member may have a 30° regular reflectance of 0.5% or less at a wavelength of 600 nm. 4. In the lens portion according to any one of 1 to 3 above, the protective member may have a surface smoothness of 0.5 arcmin or less. 5. In the lens portion according to any one of 1 to 4 above, the second ⁇ /4 member may satisfy Re(450) ⁇ Re(550). 6.
  • the lens portion according to any one of items 1 to 5 above may include a laminated portion including the second ⁇ /4 member, the reflective polarizing member, and the protective member. 7. In the lens portion described in 6 above, the laminated portion may include an absorption type polarizing member disposed between the reflective polarizing member and the protective member. 8.
  • the laminated portion may include a third ⁇ /4 member disposed between the reflective polarizing member and the protective member.
  • the third ⁇ /4 member may satisfy Re(450) ⁇ Re(550).
  • a laminated film according to an embodiment of the present invention includes a step of passing light representing an image emitted through a polarizing member and a first ⁇ /4 member through a half mirror and a first lens portion, and a step of passing through a half mirror and a first lens portion. a step of causing the light that has passed through the first lens portion to pass through a second ⁇ /4 member; and reflecting the light that has passed through the second ⁇ /4 member toward the half mirror by a reflective polarizing member.
  • the display method passes through a second lens section, the display method is arranged on an optical path between the half mirror and the second lens section, and the first lens section and the second lens The laminated film is in contact with the space formed between the two parts, and the maximum value of the 30° specular reflectance spectrum in the wavelength range of 420 nm to 680 nm is 1.4% or less.
  • the lens portion according to the embodiment of the present invention it is possible to reduce the weight of VR goggles and improve visibility.
  • FIG. 1 is a schematic diagram showing a general configuration of a display system according to one embodiment of the present invention.
  • FIG. 2 is a schematic cross-sectional view showing an example of details of a lens section of the display system shown in FIG. 1.
  • FIG. 1 is a schematic cross-sectional view showing a schematic configuration of a laminated film according to one embodiment of the present invention.
  • FIG. 2 is a schematic perspective view showing an example of a multilayer structure included in a reflective polarizing film.
  • FIG. 2 is a schematic cross-sectional view showing another example of details of the lens section of the display system shown in FIG. 1.
  • FIG. 3 is a graph showing 30° regular reflectance spectra of the laminated films of Example 1, Comparative Example 1, and Comparative Example 2.
  • (a), (b) and (c) are photographs showing the results of appearance evaluation.
  • (a), (b), (c) and (d) are photographs showing the results of appearance evaluation.
  • Refractive index (nx, ny, nz) "nx" is the refractive index in the direction in which the in-plane refractive index is maximum (i.e., slow axis direction), and "ny” is the direction perpendicular to the slow axis in the plane (i.e., fast axis direction) "nz” is the refractive index in the thickness direction.
  • Refractive index (nx, ny, nz) "nx" is the refractive index in the direction in which the in-plane refractive index is maximum (i.e., slow axis direction), and "ny” is the direction perpendicular to the slow axis in the plane (i.e., fast axis direction) "nz” is the refractive index in the thickness direction.
  • In-plane phase difference (Re) "Re( ⁇ )” is an in-plane retardation measured with light having a wavelength of ⁇ nm at 23°C.
  • Re(550) is an in-plane retardation measured with light having a wavelength of 550 nm at 23°C.
  • Phase difference in thickness direction (Rth) is a retardation in the thickness direction measured with light having a wavelength of ⁇ nm at 23°C.
  • Rth (550) is the retardation in the thickness direction measured with light having a wavelength of 550 nm at 23°C.
  • FIG. 1 is a schematic diagram showing the general configuration of a display system according to one embodiment of the present invention.
  • FIG. 1 schematically shows the arrangement, shape, etc. 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 section 16, a half mirror 18, a first retardation member 20, a second retardation member 22, and a second lens section 24. It is equipped with
  • the reflective polarizing member 14 is disposed at the 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 section 16 is arranged on the optical path between the display element 12 and the reflective polarizing member 14, and the half mirror 18 is arranged between the display element 12 and the first lens section 16.
  • the first retardation member 20 is arranged on the optical path between the display element 12 and the half mirror 18, and the second retardation member 22 is arranged on the optical path between the half mirror 18 and the reflective polarizing member 14. There is.
  • a half mirror or components disposed in front of the first lens part may be collectively referred to as a lens section (lens section 4).
  • 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.
  • the light emitted from the display surface 12a passes through a polarizing member (typically, a polarizing film) that may be included in the display element 12, and is emitted as first linearly polarized light.
  • a polarizing member typically, a polarizing film
  • the first retardation member 20 includes a first ⁇ /4 member that can convert the first linearly polarized light incident on the first retardation member 20 into first circularly polarized light.
  • the first retardation member may correspond to the first ⁇ /4 member.
  • the first retardation member 20 may be provided integrally with the display element 12.
  • the half mirror 18 transmits the light emitted from the display element 12 and reflects the light reflected by the reflective polarizing member 14 toward the reflective polarizing member 14.
  • the half mirror 18 is provided integrally with the first lens section 16.
  • the second retardation member 22 includes a second ⁇ /4 member that can transmit the light reflected by the reflective polarizing member 14 and the half mirror 18 through the reflective polarizing member 14.
  • the second retardation member may correspond to the second ⁇ /4 member.
  • the second retardation member 22 may be provided integrally with the first lens portion 16.
  • the first circularly polarized light emitted from the first ⁇ /4 member included in the first retardation member 20 passes through the half mirror 18 and the first lens portion 16, and The second ⁇ /4 member converts the light into a second linearly polarized light.
  • the second linearly polarized light emitted from the second ⁇ /4 member is reflected toward the half mirror 18 without passing through the reflective polarizing member 14.
  • the polarization direction of the second linearly polarized light incident on the reflective polarizing member 14 is the same direction as the reflection axis of the reflective polarizing member 14. Therefore, the second linearly polarized light incident on the reflective polarizing member 14 is reflected by the reflective polarizing member 14.
  • the second linearly polarized light reflected by the reflective polarizing member 14 is converted into second circularly polarized light by the second ⁇ /4 member included in the second retardation member 22, and is emitted from the second ⁇ /4 member.
  • the second circularly polarized light 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 third linearly polarized light by the second ⁇ /4 member included in the second retardation member 22.
  • the third linearly polarized light is transmitted through the reflective polarizing member 14 .
  • the polarization direction of the third linearly polarized light incident on the reflective polarizing member 14 is the same direction as the transmission axis of the reflective polarizing member 14. Therefore, the third linearly polarized light incident on the reflective polarizing member 14 is transmitted through the reflective polarizing member 14.
  • the light transmitted through the reflective polarizing member 14 passes through the second lens section 24 and enters the user's eyes 26.
  • the absorption axis of the polarizing member included in the display element 12 and the reflection axis of the reflective polarizing member 14 may be arranged substantially parallel to each other, or may be arranged substantially perpendicular to each other.
  • the angle between the absorption axis of the polarizing member included in the display element 12 and the slow axis of the first ⁇ /4 member included in the first retardation member 20 is, for example, 40° to 50°, and 42° to 50°. It may be 48° or about 45°.
  • the angle between the absorption axis of the polarizing member included in the display element 12 and the slow axis of the second ⁇ /4 member included in the second retardation member 22 is, for example, 40° to 50°, and 42° to 50°. It may be 48° or about 45°.
  • the in-plane retardation Re (550) of the first ⁇ /4 member is, for example, 100 nm to 190 nm, may be 110 nm to 180 nm, may be 130 nm to 160 nm, or may be 135 nm to 155 nm. good.
  • the first ⁇ /4 member preferably exhibits inverse dispersion wavelength characteristics in which the retardation value increases depending on the wavelength of the measurement light.
  • Re(450)/Re(550) of the first ⁇ /4 member is, for example, 0.75 or more and less than 1, and may be 0.8 or more and 0.95 or less.
  • the in-plane retardation Re (550) of the second ⁇ /4 member is, for example, 100 nm to 190 nm, may be 110 nm to 180 nm, may be 130 nm to 160 nm, or may be 135 nm to 155 nm. good.
  • the second ⁇ /4 member preferably exhibits inverse dispersion wavelength characteristics in which the retardation value increases depending on the wavelength of the measurement light.
  • Re(450)/Re(550) of the second ⁇ /4 member is, for example, 0.75 or more and less than 1, and may be 0.8 or more and 0.95 or less.
  • a space may be formed between the first lens portion 16 and the second lens portion 24.
  • the member disposed between the first lens section 16 and the second lens section 24 is preferably provided integrally with either the first lens section 16 or the second lens section 24.
  • the member disposed between the first lens part 16 and the second lens part 24 be integrated with either the first lens part 16 or the second lens part 24 via an adhesive layer. According to such a configuration, for example, each member can be easily handled.
  • the adhesive layer may be formed of an adhesive or a pressure-sensitive adhesive.
  • the adhesive layer may be an adhesive layer or an adhesive layer.
  • the thickness of the adhesive layer is, for example, 0.05 ⁇ m to 30 ⁇ m.
  • FIG. 2 is a schematic cross-sectional view showing an example of details of the lens section of the display system shown in FIG. 1. Specifically, FIG. 2 shows a first lens part, a second lens part, and members disposed between them.
  • the lens part 4 includes a first lens part 16 , a first laminated part 100 provided adjacent to the first lens part 16 , a second lens part 24 , and a second laminated part 100 provided adjacent to the second lens part 24 .
  • a laminated portion 200 is provided.
  • the first laminated part 100 and the second laminated part 200 are arranged apart from each other.
  • a half mirror may be provided integrally with the first lens section 16.
  • the first laminated part 100 includes a second retardation member 22 and an adhesive layer (for example, an adhesive layer) 41 disposed between the first lens part 16 and the second retardation member 22, and the adhesive layer 41, it is integrally provided to the first lens portion 16.
  • the first laminated portion 100 further includes a first protection member 31 disposed in front of the second retardation member 22.
  • the first protection member 31 is laminated on the second retardation member 22 with an adhesive layer (eg, adhesive layer) 42 interposed therebetween.
  • the first protection member 31 may be located on the outermost surface of the first laminated portion 100.
  • the second retardation member 22 has a laminated structure of a second ⁇ /4 member 22a and a positive C plate 22b. By using a positive C plate, light leakage (for example, light leakage in an oblique direction) can be prevented.
  • the second ⁇ /4 member 22a is located in front of the positive C plate 22b.
  • the second ⁇ /4 member 22a and the positive C plate 22b are laminated, for example, via an adhesive layer (not shown).
  • the second ⁇ /4 member exhibits a refractive index characteristic of nx>ny ⁇ nz.
  • the Nz coefficient of the second ⁇ /4 member is preferably 0.9 to 3, more preferably 0.9 to 2.5, even more preferably 0.9 to 1.5, and particularly preferably is 0.9 to 1.3.
  • the second ⁇ /4 member is formed of any suitable material that can satisfy the above characteristics.
  • the second ⁇ /4 member may be, for example, a stretched film of a resin film or an oriented solidified layer of a liquid crystal compound.
  • the resins 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, and polyamide resin. , polyimide resin, polyether resin, polystyrene resin, acrylic resin, and the like. These resins may be used alone or in combination. Examples of the combination method include blending and copolymerization. When the second ⁇ /4 member exhibits reverse dispersion wavelength characteristics, a resin film containing a polycarbonate resin or a polyester carbonate resin (hereinafter sometimes simply referred to as a polycarbonate resin) may be suitably used.
  • polycarbonate resins contain structural units derived from fluorene-based dihydroxy compounds, structural units derived from isosorbide-based dihydroxy compounds, alicyclic diols, alicyclic dimethanols, di-, tri-, or polyethylene glycols, and alkylene-based dihydroxy compounds. a structural unit derived from at least one dihydroxy compound selected from the group consisting of glycol or spiroglycol.
  • the polycarbonate resin contains a structural unit derived from a fluorene dihydroxy compound, a structural unit derived from an isosorbide dihydroxy compound, a structural unit derived from an alicyclic dimethanol, and/or a di, tri, or polyethylene glycol. More preferably, it contains a structural unit derived from a fluorene dihydroxy compound, a structural unit derived from an isosorbide dihydroxy compound, and a structural unit derived from di, tri or polyethylene glycol. .
  • the polycarbonate resin may contain structural units derived from other dihydroxy compounds as necessary.
  • the thickness of the second ⁇ /4 member made of a stretched resin film is, for example, 10 ⁇ m to 100 ⁇ m, preferably 10 ⁇ m to 70 ⁇ m, and more preferably 20 ⁇ m to 60 ⁇ m.
  • the liquid crystal compound alignment and solidification layer is a layer in which the liquid crystal compound is aligned in a predetermined direction within the layer, and the alignment state is fixed.
  • the "alignment hardened layer” is a concept that includes an orientation hardened layer obtained by curing a liquid crystal monomer as described below.
  • rod-shaped liquid crystal compounds are typically aligned in the slow axis direction of the second ⁇ /4 member (homogeneous alignment). Examples of rod-shaped liquid crystal compounds include liquid crystal polymers and liquid crystal monomers.
  • the liquid crystal compound is preferably polymerizable. If the liquid crystal compound is polymerizable, the alignment state of the liquid crystal compound can be fixed by aligning the liquid crystal compound and then polymerizing it.
  • the liquid crystal compound alignment and solidification layer is produced by subjecting the surface of a predetermined base material to an alignment treatment, applying a coating liquid containing the liquid crystal compound to the surface, and subjecting the liquid crystal compound to the alignment treatment. It can be formed by orienting it in a corresponding direction and fixing the orientation state. Any suitable orientation treatment may be employed as the orientation treatment. Specifically, mechanical alignment treatment, physical alignment treatment, and chemical alignment treatment can be mentioned. Specific examples of mechanical alignment treatment include rubbing treatment and stretching treatment. Specific examples of physical alignment treatment include magnetic field alignment treatment and electric field alignment treatment. Specific examples of chemical alignment treatment include oblique vapor deposition and photo alignment treatment. As the treatment conditions for various orientation treatments, any appropriate conditions may be adopted depending on the purpose.
  • the alignment of the liquid crystal compound is carried out by treatment at a temperature that exhibits a liquid crystal phase depending on the type of liquid crystal compound.
  • the liquid crystal compound assumes a liquid crystal state, and the liquid crystal compound is oriented in accordance with the orientation treatment direction of the substrate surface.
  • the alignment state is fixed by cooling the liquid crystal compound aligned as described above.
  • the alignment state is fixed by subjecting the liquid crystal compound aligned as described above to polymerization treatment or crosslinking treatment.
  • liquid crystal compound any suitable liquid crystal polymer and/or liquid crystal monomer can be used as the liquid crystal compound.
  • the liquid crystal polymer and the liquid crystal monomer may be used alone or in combination.
  • Specific examples of liquid crystal compounds and methods for producing liquid crystal alignment solidified layers are described in, for example, JP 2006-163343A, JP 2006-178389A, and WO 2018/123551A. The descriptions of these publications are incorporated herein by reference.
  • the thickness of the second ⁇ /4 member composed of the liquid crystal alignment solidified layer is, for example, 1 ⁇ m to 10 ⁇ m, preferably 1 ⁇ m to 8 ⁇ m, more preferably 1 ⁇ m to 6 ⁇ m, and even more preferably 1 ⁇ m to 4 ⁇ m. be.
  • the retardation Rth (550) in the thickness direction of the positive C plate is preferably -50 nm to -300 nm, more preferably -70 nm to -250 nm, still more preferably -90 nm to -200 nm, and particularly preferably is ⁇ 100 nm to ⁇ 180 nm.
  • the in-plane retardation Re (550) of the positive C plate is, for example, less than 10 nm.
  • the positive C-plate may be formed of any suitable material
  • the positive C-plate preferably consists of a film containing liquid crystal material fixed in a homeotropic orientation.
  • the liquid crystal material (liquid crystal compound) that can be homeotropically aligned may be a liquid crystal monomer or a liquid crystal polymer.
  • Specific examples of the method for forming such a liquid crystal compound and positive C plate include the method for forming the liquid crystal compound and the retardation layer described in [0020] to [0028] of JP-A No. 2002-333642.
  • the thickness of the positive C plate is preferably 0.5 ⁇ m to 5 ⁇ m.
  • the first protective member may be a laminated film having a base material and a surface treatment layer.
  • the first protection member having the surface treatment layer may be arranged such that the surface treatment layer is located on the front side.
  • the surface treatment layer may be located on the outermost surface of the first laminated portion.
  • the maximum value of the 30° specular reflectance spectrum in the wavelength range of 420 nm to 680 nm is 0% or more and 1.4% or less, preferably 1.2% or less, and more preferably 1.0%. % or less.
  • Such light loss can be suppressed extremely well.
  • the amount of light required is large, and the effect of suppressing light loss can be significantly obtained.
  • the light can pass through the member disposed between the half mirror 18 and the reflective polarizing member 14 three times, so that the effect of suppressing light loss is achieved. can be obtained significantly.
  • the protective member satisfies the above reflection characteristics, it is possible to suppress visual recognition of afterimages (ghosts) resulting from reflection.
  • hue management can be important when the amount of light used is large.
  • the balance of reflectance in the visible light region can be important.
  • the 30° regular reflectance of the first protective member at a wavelength of 450 nm is, for example, 0.01% or more and 0.6% or less, preferably 0.5% or less, and more preferably 0.4% or less, More preferably, it is 0.3% or less.
  • the 30° regular reflectance of the first protective member at a wavelength of 600 nm is, for example, 0.01% or more and 0.6% or less, preferably 0.5% or less, and more preferably 0.4% or less, More preferably, it is 0.3% or less.
  • the 30° specular reflectance spectrum of the first protective member in the wavelength range of 420 nm to 680 nm may have minimum values in the wavelength range of 430 nm to 470 nm and in the wavelength range of 550 nm to 590 nm.
  • the ratio of the average value Ave (430-470 nm) of 30 degree regular reflectance in the wavelength range 430 nm to 470 nm to the average value Ave (480-510 nm) of 30 degree regular reflectance in the wavelength range 480 nm to 510 nm is: It is preferably 0.10 or more and less than 1.0, and may be 0.80 or less.
  • the ratio of the average value Ave (580-620 nm) of 30 degree regular reflectance in the wavelength range from 580 nm to 620 nm to the average value Ave (480-510 nm) of 30 degree regular reflectance in the wavelength range from 480 nm to 510 nm is: It is preferably 0.10 or more and less than 1.0, and may be 0.80 or less.
  • the average value of the 30° regular reflectance can be determined, for example, by extracting measured values every 5 nm in each wavelength range and dividing the total by the number of extracted wavelengths.
  • the surface smoothness of the first protective member is preferably 0.5 arcmin or less, more preferably 0.4 arcmin or less. By using a protective member that satisfies such smoothness, it is possible to suppress the generation of diffused light and to suppress images from becoming unclear. Substantially, the surface smoothness of the first protection member is, for example, 0.1 arcmin or more.
  • the thickness of the first protective member is preferably 10 ⁇ m to 80 ⁇ m, more preferably 15 ⁇ m to 60 ⁇ m, and even more preferably 20 ⁇ m to 45 ⁇ m.
  • FIG. 3 is a schematic cross-sectional view showing the general structure of a laminated film according to one embodiment of the present invention.
  • the laminated film 34 has a base material 36 and a surface treatment layer 38 disposed above the base material 36.
  • the thickness of the base material 36 is preferably 5 ⁇ m to 80 ⁇ m, more preferably 10 ⁇ m to 50 ⁇ m, and still more preferably 15 ⁇ m to 40 ⁇ m.
  • the surface smoothness of the base material 36 is preferably 0.7 arcmin or less, more preferably 0.6 arcmin or less, and even more preferably 0.5 arcmin or less. Note that surface smoothness can be measured by focusing irradiation light on the surface of the target.
  • the base material 36 may be composed of any suitable film.
  • Materials that are the main components of the film constituting the base material 36 include, for example, cellulose resins such as triacetyl cellulose (TAC), polyesters, polyvinyl alcohols, polycarbonates, polyamides, polyimides, and polyethersulfones. , polysulfone-based, polystyrene-based, cycloolefin-based such as polynorbornene, polyolefin-based, (meth)acrylic-based, acetate-based resins, and the like.
  • (meth)acrylic refers to acrylic and/or methacrylic.
  • the base material 36 is preferably made of (meth)acrylic resin.
  • the thickness of the surface treatment layer 38 is preferably 0.5 ⁇ m to 10 ⁇ m, more preferably 1 ⁇ m to 7 ⁇ m, and even more preferably 2 ⁇ m to 5 ⁇ m.
  • the surface treatment layer 38 includes, for example, a hard coat layer 38a and a functional layer 38b having an antireflection function.
  • the hard coat layer 38a is typically formed by applying a hard coat layer forming material to the base material 36 and curing the applied layer.
  • the hard coat layer forming material typically contains a curable compound as a layer forming component.
  • the curing mechanism of the curable compound include a thermosetting type and a photocuring type.
  • the curable compound include monomers, oligomers, and prepolymers. Preferably, a polyfunctional monomer or oligomer is used as the curable compound.
  • polyfunctional monomers or oligomers examples include monomers or oligomers having two or more (meth)acryloyl groups, urethane (meth)acrylate or urethane (meth)acrylate oligomers, epoxy monomers or oligomers, and silicone monomers or oligomers. can be mentioned.
  • the thickness of the hard coat layer 38a is preferably 0.5 ⁇ m to 10 ⁇ m, more preferably 1 ⁇ m to 7 ⁇ m, and even more preferably 2 ⁇ m to 5 ⁇ m.
  • the functional layer 38b has a laminated structure including a high refractive index layer and a low refractive index layer. It is preferable that the functional layer 38b has a high refractive index layer and a low refractive index layer in this order from the base material 36 side. By having such a laminated structure, the above reflection characteristics can be satisfactorily satisfied.
  • the high refractive index layer may be made of a high refractive index resin (for example, the refractive index measured at a wavelength of 550 nm is 1.55 or more).
  • the high refractive index layer may typically be a coating layer.
  • the high refractive index layer may be constituted by an inorganic film.
  • the high refractive index layer can typically be formed by vacuum deposition, physical vapor deposition such as sputtering, or chemical vapor deposition.
  • the thickness of the high refractive index layer is preferably 10 nm to 200 nm, more preferably 20 nm to 150 nm.
  • the thickness of the low refractive index layer is preferably 10 nm to 200 nm, more preferably 20 nm to 150 nm.
  • the above-mentioned low refractive index layer can be obtained, for example, by applying a coating liquid for forming a low refractive index layer (antireflection layer) and curing the resulting coating film.
  • the coating liquid for forming an antireflection layer may contain, for example, a resin component (curable compound), a fluorine-containing additive, hollow particles, solid particles, a solvent, etc., and may be obtained by mixing these, for example. I can do it.
  • Examples of the curing mechanism of the resin component (curable compound) contained in the coating liquid for forming an antireflection layer include a thermosetting type and a photocuring type.
  • a curable compound having at least one of an acrylate group and a methacrylate group is used, such as silicone resin, polyester resin, polyether resin, epoxy resin, urethane resin, alkyd resin, and spiroacetal resin. , polybutadiene resins, polythiol polyene resins, oligomers or prepolymers such as acrylates and methacrylates of polyfunctional compounds such as polyhydric alcohols, and the like. These may be used alone or in combination of two or more.
  • a reactive diluent having at least one of an acrylate group and a methacrylate group can also be used.
  • the reactive diluent for example, the reactive diluent described in JP-A-2008-88309 can be used, and includes, for example, monofunctional acrylate, monofunctional methacrylate, polyfunctional acrylate, polyfunctional methacrylate, and the like.
  • the reactive diluent from the viewpoint of obtaining excellent hardness, trifunctional or higher functional acrylates and trifunctional or higher functional methacrylates are preferably used.
  • the reactive diluent examples include butanediol glycerol ether diacrylate, isocyanuric acid acrylate, isocyanuric acid methacrylate, and the like. These may be used alone or in combination of two or more.
  • a curing agent may be used to cure the resin component.
  • known polymerization initiators eg, thermal polymerization initiators, photopolymerization initiators, etc.
  • the above-mentioned fluorine-containing additive may be, for example, an organic compound containing fluorine or an inorganic compound containing fluorine.
  • the organic compound containing fluorine include a fluorine-containing antifouling coating agent, a fluorine-containing acrylic compound, and a fluorine/silicon containing acrylic compound.
  • Commercially available products can be used as the organic compound containing fluorine. Specific examples of commercially available products include the product name "KY-1203" manufactured by Shin-Etsu Chemical Co., Ltd. and the product name "Megafac" manufactured by DIC Corporation.
  • the content of the fluorine-containing additive is, for example, 0.05 parts by weight or more, 0.1 parts by weight or more, 0.15 parts by weight or more, 0.20 parts by weight or more, or 0 parts by weight, based on 100 parts by weight of the resin component.
  • the amount may be .25 parts by weight or more, 20 parts by weight or less, 15 parts by weight or less, 10 parts by weight or less, 5 parts by weight or less, or 3 parts by weight or less.
  • hollow particles for example, silica particles, acrylic particles, and acrylic-styrene copolymer particles are used.
  • hollow silica particles commercially available products (for example, trade names "Sururia 5320" and "Surulia 4320” manufactured by JGC Catalysts & Chemicals, Ltd.) can be used.
  • the weight average particle diameter of the hollow particles may be, for example, 30 nm or more, 40 nm or more, 50 nm or more, 60 nm or more, or 70 nm or more, and 150 nm or less, 140 nm or less, 130 nm or less, 120 nm or less, or 110 nm or less. Good too.
  • the shape of the hollow particles is not particularly limited, but is preferably approximately spherical. Specifically, the aspect ratio of the hollow particles is preferably 1.5 or less.
  • the content of the hollow particles may be, for example, 30 parts by weight or more, 50 parts by weight or more, 70 parts by weight or more, 90 parts by weight or more, or 100 parts by weight or more, based on 100 parts by weight of the resin component. It may be less than 270 parts by weight, less than 250 parts by weight, less than 200 parts by weight, or less than 180 parts by weight.
  • the solid particles for example, silica particles, zirconia particles, and titania particles are used.
  • the solid silica particles commercially available products (for example, trade names "MEK-2140Z-AC”, “MIBK-ST”, and “IPA-ST” manufactured by Nissan Chemical Industries, Ltd.) can be used.
  • the weight average particle diameter of the solid particles may be, for example, 5 nm or more, 10 nm or more, 15 nm or more, 20 nm or more, or 25 nm or more, and 330 nm or less, 250 nm or less, 200 nm or less, 150 nm or less, or 100 nm or less. It's okay.
  • the shape of the hollow particles is not particularly limited, but is preferably approximately spherical. Specifically, the aspect ratio of the hollow particles is preferably 1.5 or less.
  • the content of the solid particles may be, for example, 5 parts by weight or more, 10 parts by weight or more, 15 parts by weight or more, 20 parts by weight or more, or 25 parts by weight or more, based on 100 parts by weight of the resin component. It may be 150 parts by weight or less, 120 parts by weight or less, 100 parts by weight or less, or 80 parts by weight or less.
  • solvents include alcohols such as methanol, ethanol, isopropyl alcohol, butanol, TBA (tertiary butyl alcohol), and 2-methoxyethanol; ketones such as acetone, methyl ethyl ketone, MIBK (methyl isobutyl ketone), and cyclopentanone.
  • alcohols such as methanol, ethanol, isopropyl alcohol, butanol, TBA (tertiary butyl alcohol), and 2-methoxyethanol
  • ketones such as acetone, methyl ethyl ketone, MIBK (methyl isobutyl ketone), and cyclopentanone.
  • Esters such as methyl acetate, ethyl acetate, butyl acetate, PMA (propylene glycol monomethyl ether acetate); Ethers such as diisopropyl ether, propylene glycol monomethyl ether; Glycols such as ethylene glycol, propylene glycol; Ethyl cellosolve, butyl cellosolve, etc.
  • Examples include cellosolves; aliphatic hydrocarbons such as hexane, heptane, and octane; and aromatic hydrocarbons such as benzene, toluene, and xylene. These may be used alone or in combination of two or more.
  • the content of the solvent is, for example, such that the weight of the solids relative to the weight of the entire coating liquid for forming an antireflection layer is, for example, 0.1% by weight or more, 0.3% by weight or more, 0.5% by weight or more,
  • the content may be 1.0% by weight or more, or 1.5% by weight or more, and may be 20% by weight or less, 15% by weight or less, 10% by weight or less, 5% by weight or less, or 3% by weight or less. You can also do this.
  • a coating method for the coating liquid for forming the antireflection layer for example, known coating methods such as fountain coating method, die coating method, spin coating method, spray coating method, gravure coating method, roll coating method, and bar coating method can be used. construction method can be used.
  • the drying temperature of the coating film is, for example, 30° C. to 200° C., and the drying time is, for example, 30 seconds to 90 seconds.
  • the coating film can be cured by, for example, heating or light irradiation (typically, ultraviolet irradiation).
  • a light source for light irradiation for example, a high pressure mercury lamp is used.
  • the amount of ultraviolet irradiation is preferably 50 mJ/cm 2 to 500 mJ/cm 2 as a cumulative exposure amount at an ultraviolet wavelength of 365 nm.
  • the second laminated portion 200 includes a reflective polarizing member 14 and an adhesive layer (for example, an adhesive layer) disposed between the reflective polarizing member 14 and the second lens portion 24.
  • the second laminated section 200 further includes, for example, an absorptive polarizing member 28 disposed between the reflective polarizing member 14 and the second lens section 24 from the viewpoint of improving visibility.
  • the absorptive polarizing member 28 is laminated in front of the reflective polarizing member 14 with an adhesive layer (for example, an adhesive layer) 44 interposed therebetween.
  • the reflection axis of the reflective polarizing member 14 and the absorption axis of the absorptive polarizing member 28 may be arranged 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 may be arranged substantially parallel to each other. may be placed.
  • the reflective polarizing member 14 and the absorbing polarizing member 28 are fixed, and it is possible to prevent misalignment of the axis arrangement between the reflective axis and the absorption axis (the transmission axis and the transmission axis). . Further, it is possible to suppress the adverse effects of an air layer that may be formed between the reflective polarizing member 14 and the absorbing polarizing member 28.
  • the second laminated section 200 further includes a second protection member 32 disposed behind the reflective polarizing member 14.
  • the second protection member 32 is laminated on the reflective polarizing member 14 via an adhesive layer (for example, an adhesive layer) 43.
  • the second protection member 32 may be located on the outermost surface of the second laminated portion 200.
  • the first protection member 31 and the second protection member 32 are arranged facing each other with a space interposed therebetween.
  • the second protection member may typically be a laminated film having a base material and a surface treatment layer. In this case, the surface treatment layer may be located on the outermost surface of the second laminated portion.
  • the same explanation as that for the first protection member can be applied. Specifically, the same explanations as for the first protection member can be applied to the reflection characteristics, effects, smoothness, configuration, thickness, and constituent materials of the second protection member.
  • the second laminated section 200 further includes a third retardation member 30 disposed between the absorptive polarizing member 28 and the second lens section 24.
  • the third retardation member 30 is laminated on the absorption type polarizing member 28 via an adhesive layer (for example, an adhesive layer) 45. Further, the third retardation member 30 is laminated on the second lens portion 24 via an adhesive layer (for example, an adhesive layer) 46, and the second laminated portion 200 is integrally provided on the second lens portion 24.
  • the third retardation member 30 includes, for example, a third ⁇ /4 member.
  • the angle between the absorption axis of the absorption type polarizing member 28 and the slow axis of the third ⁇ /4 member included in the third retardation member 30 is, for example, 40° to 50°, and 42° to 48°. The angle may be approximately 45°. By providing such a member, for example, reflection of external light from the second lens portion 16 side can be prevented. If the third retardation member does not include any member other than the third ⁇ /4 member, the third retardation member may correspond to the third ⁇ /4 member.
  • the reflective polarizing member can transmit polarized light parallel to its transmission axis (typically, linearly polarized light) while maintaining its polarized state, and can reflect light in other polarized states.
  • the reflective polarizing member is typically composed of a film having a multilayer structure (sometimes referred to as a reflective polarizing film).
  • the thickness of the reflective polarizing member is, for example, 10 ⁇ m to 150 ⁇ m, preferably 20 ⁇ m to 100 ⁇ m, and more preferably 30 ⁇ m to 60 ⁇ m.
  • FIG. 4 is a schematic perspective view showing an example of a multilayer structure included in a reflective polarizing film.
  • the multilayer structure 14a has layers A having birefringence and layers B having substantially no birefringence alternating.
  • the total number of layers making up the multilayer structure may be between 50 and 1000.
  • the refractive index nx in the x-axis direction of the A layer is larger 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 the B layer are substantially the same,
  • 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.
  • the x-axis direction can become the reflection axis
  • the y-axis direction can become 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.
  • the above layer A is typically made of a material that exhibits birefringence when stretched.
  • materials include, for example, naphthalene dicarboxylic acid polyesters (eg, polyethylene naphthalate), polycarbonates, and acrylic resins (eg, polymethyl methacrylate).
  • the B layer is typically made of a material that does not substantially exhibit birefringence even when stretched. Examples of such materials include copolyesters of naphthalene dicarboxylic acid and terephthalic acid.
  • the multilayer structure may be formed by a combination of coextrusion and stretching. For example, after extruding the material constituting layer A and the material constituting layer B, they are multilayered (for example, using a multiplier). The obtained multilayer laminate is then stretched.
  • the x-axis direction in the illustrated example may correspond to the stretching direction.
  • reflective polarizing films include, for example, 3M's product names "DBEF” and “APF” and Nitto Denko's product name "APCF”.
  • the cross transmittance (Tc) of the reflective polarizing member (reflective polarizing film) may be, for example, 0.01% to 3%.
  • the single transmittance (Ts) of the reflective polarizing member (reflective polarizing film) is, for example, 43% to 49%, preferably 45% to 47%.
  • the degree of polarization (P) of the reflective polarizing member (reflective polarizing film) can be, for example, 92% to 99.99%.
  • the above-mentioned orthogonal transmittance, single transmittance, and degree of polarization can be measured using, for example, an ultraviolet-visible spectrophotometer.
  • the degree of polarization P can be determined by measuring the single transmittance Ts, parallel transmittance Tp, and cross transmittance Tc using an ultraviolet-visible spectrophotometer, and from the obtained Tp and Tc using the following formula.
  • Ts, Tp, and Tc are Y values measured using a 2-degree visual field (C light source) according to JIS Z 8701 and subjected to visibility correction.
  • Polarization degree P (%) ⁇ (Tp-Tc)/(Tp+Tc) ⁇ 1/2 ⁇ 100
  • the absorption type polarizing member may typically include a resin film (sometimes referred to as an absorption type polarizing film) containing a dichroic substance.
  • the thickness of the absorption type polarizing film is, for example, 1 ⁇ m or more and 20 ⁇ m or less, may be 2 ⁇ m or more and 15 ⁇ m or less, may be 12 ⁇ m or less, may be 10 ⁇ m or less, or may be 8 ⁇ m or less, It may be 5 ⁇ m or less.
  • the above-mentioned absorption type polarizing film may be produced from a single layer resin film, or may be produced using a laminate of two or more layers.
  • 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 is coated with iodine or dichloromethane.
  • An absorption type polarizing film can be obtained by performing a dyeing treatment with a dichroic substance such as a color dye, a stretching treatment, and the like. Among these, an absorption type polarizing film obtained by dyeing a PVA film with iodine and uniaxially stretching it is preferred.
  • the above-mentioned staining with iodine is performed, for example, by immersing the PVA-based film in an iodine aqueous solution.
  • the stretching ratio of the above-mentioned uniaxial stretching is preferably 3 to 7 times. Stretching may be performed after the dyeing process or may be performed while dyeing. Alternatively, it may be dyed after being stretched. If necessary, the PVA film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment, etc.
  • the laminate produced using the above-mentioned laminate of two or more layers is a laminate of a resin base material and a PVA resin layer (PVA resin film) laminated on the resin base material, or a laminate of a resin base material and a PVA resin layer (PVA resin film) laminated on the resin base material, or Examples include a laminate of a material and a PVA-based resin layer formed by coating on the resin base material.
  • An absorption type polarizing film obtained by using a laminate of a resin base material and a PVA resin layer coated on the resin base material can be obtained by, for example, applying a PVA resin solution to the resin base material, drying it, and applying the resin.
  • a PVA-based resin layer on a base material to obtain a laminate of the resin base material and the PVA-based resin layer; stretching and dyeing the laminate to make the PVA-based resin layer an absorption type polarizing film.
  • a polyvinyl alcohol resin layer containing a halide and a polyvinyl alcohol resin is formed on one side of the resin base material.
  • Stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching.
  • the stretching may further include stretching the laminate in air at a high temperature (for example, 95° C. or higher) before stretching in the boric acid aqueous solution, if necessary.
  • the laminate is preferably subjected to a drying shrinkage treatment in which the laminate is heated while being conveyed in the longitudinal direction to shrink by 2% or more in the width direction.
  • the manufacturing method of this embodiment includes subjecting the laminate to an in-air auxiliary stretching process, a dyeing process, an underwater stretching process, and a drying shrinkage process in this order.
  • the obtained resin base material/absorption type polarizing film laminate may be used as is (that is, the resin base material may be used as a protective layer of the absorption type polarizing film), or the resin base material/absorption type polarizing film laminate may be used as is.
  • Any suitable protective layer depending on the purpose may be laminated on the peeled surface from which the resin base material is peeled off, or on the surface opposite to the peeled surface. Details of the manufacturing method of such an absorption type polarizing film are described in, for example, Japanese Patent Application Publication No. 2012-73580 and Japanese Patent No. 6470455. The entire descriptions of these publications are incorporated herein by reference.
  • the orthogonal transmittance (Tc) of the absorption type polarizing member (absorption type polarizing film) is preferably 0.5% or less, more preferably 0.1% or less, and still more preferably 0.05% or less. be.
  • the single transmittance (Ts) of the absorption type polarizing member (absorption type polarizing film) is, for example, 41.0% to 45.0%, preferably 42.0% or more.
  • the degree of polarization (P) of the absorption type polarizing member (absorption type polarizing film) is, for example, 99.0% to 99.997%, preferably 99.9% or more.
  • the in-plane retardation Re (550) of the third ⁇ /4 member is, for example, 100 nm to 190 nm, may be 110 nm to 180 nm, may be 130 nm to 160 nm, or may be 135 nm to 155 nm. Good too.
  • the third ⁇ /4 member preferably exhibits inverse dispersion wavelength characteristics in which the retardation value increases depending on the wavelength of the measurement light.
  • Re(450)/Re(550) of the third ⁇ /4 member is, for example, 0.75 or more and less than 1, and may be 0.8 or more and 0.95 or less.
  • the third ⁇ /4 member preferably exhibits a refractive index characteristic of nx>ny ⁇ nz.
  • the Nz coefficient of the third ⁇ /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 is 0.9 to 1.3.
  • the third ⁇ /4 member is formed of any suitable material that can satisfy the above characteristics.
  • the third ⁇ /4 member may be, for example, a stretched film of a resin film or an oriented solidified layer of a liquid crystal compound.
  • the same explanation as for the second ⁇ /4 member can be applied to the third ⁇ /4 member composed of a stretched resin film or an oriented solidified layer of a liquid crystal compound.
  • the second ⁇ /4 member and the third ⁇ /4 member may be members with the same configuration (for example, forming material, thickness, optical properties, etc.), or may be members with different configurations.
  • FIG. 5 is a schematic cross-sectional view showing another example of details of the lens portion of the display system shown in FIG. 1. Specifically, FIG. 5 shows a first lens part, a second lens part, and members disposed between them.
  • the lens section 4 includes a first lens section 16 , a first laminated section 100 provided adjacent to the first lens section 16 , and a second lens section 24 .
  • the first laminated portion 100 and the second lens portion 24 are arranged apart from each other.
  • the first laminated part 100 includes a second retardation member 22 having a laminated structure of a second ⁇ /4 member 22a and a positive C plate 22b, a reflective polarizing member 14, an absorptive polarizing member 28, and a third It includes a phase difference member 30 and a first protection member 31. It also includes adhesive layers (for example, adhesive layers) 41 to 45 that integrate each member.
  • the member disposed between the first lens part 16 and the second lens part 24 is provided integrally with the first lens part 16. Only the first protection member 31 is provided as a protection member in contact with the space formed between the first lens part 16 and the second lens part 24.
  • the thickness and surface smoothness are values measured by the following measuring method. Furthermore, unless otherwise specified, "parts" and “%” are based on weight.
  • ⁇ Thickness> The thickness of 10 ⁇ m or less was measured using a scanning electron microscope (manufactured by JEOL Ltd., product name “JSM-7100F”). Thickness exceeding 10 ⁇ m was measured using a digital micrometer (manufactured by Anritsu Corporation, product name “KC-351C”).
  • a measurement sample is placed on a measurement table with a vibration-proof table, interference fringes are generated using a single white LED illumination, and an interference objective lens (1.4x) with a reference plane is placed in the Z direction (thickness).
  • the smoothness (surface smoothness) of the outermost surface of the object to be measured in a field of view of 12.4 mm ⁇ was selectively obtained by scanning in the 12.4 mm ⁇ field of view.
  • An acrylic adhesive layer with a thickness of 5 ⁇ m and minimal irregularities is formed on microslide glass (manufactured by Matsunami Glass Industries Co., Ltd., product name "S200200”), and the film to be measured is coated with foreign objects, air bubbles, and deformation lines on this adhesive surface.
  • the smoothness of the surface opposite to the adhesive layer was measured.
  • the value obtained by doubling the angle index "Slope magnitude RMS" (corresponding to 2 ⁇ ) was defined as surface smoothness (unit: arcmin).
  • Example 1 Preparation of hard coat layer forming material
  • 50 parts of urethane acrylic oligomer manufactured by Shin-Nakamura Chemical Co., Ltd., "NK Oligo UA-53H"
  • polyfunctional acrylate whose main component is pentaerythritol triacrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name "Viscoat #300")
  • 4-hydroxybutyl acrylate manufactured by Osaka Organic Chemical Industry Co., Ltd.
  • a leveling agent manufactured by DIC Corporation, "GRANDIC PC4100
  • a photopolymerization initiator manufactured by Ciba Japan, "Irgacure 907
  • Three parts were mixed and diluted with methyl isobutyl ketone to a solid content concentration of 50% to prepare a hard coat layer forming material.
  • a mixed solvent of TBA tertiary butyl alcohol
  • MIBK methyl isobutyl ketone
  • PMA propylene glycol monomethyl ether acetate
  • the hard coat layer forming material described above was applied to an acrylic film having a lactone ring structure (thickness: 40 ⁇ m, surface smoothness: 0.45 arcmin), heated at 90°C for 1 minute, and the coated layer after heating was coated with a high-pressure mercury lamp.
  • the coating layer was cured by irradiating ultraviolet rays with a cumulative light intensity of 300 mJ/cm 2 to produce an acrylic film (44 ⁇ m thick, surface smoothness on the hard coat layer side 0.4 arcmin) on which a 4 ⁇ m thick hard coat layer was formed.
  • the coating solution for forming a high refractive index layer was applied onto the hard coat layer using a wire bar, and the applied coating solution was heated at 80° C.
  • the dried coating film was cured by irradiating ultraviolet rays with a cumulative light intensity of 300 mJ/cm 2 using a high-pressure mercury lamp to form a high refractive index layer with a thickness of 140 nm.
  • the above coating liquid for forming a low refractive index layer is applied onto the high refractive index layer using a wire bar, and the applied coating liquid is heated at 80°C for 1 minute and dried to form a coating film. did.
  • the dried coating film was cured by irradiating ultraviolet rays with a cumulative light intensity of 300 mJ/cm 2 using a high-pressure mercury lamp to form a low refractive index layer with a thickness of 105 nm. In this way, a laminated film with a thickness of 44 ⁇ m and a surface smoothness of 0.4 arcmin was obtained.
  • Example 1 Same as Example 1 except that a high refractive index layer was not formed and a 100 nm thick low refractive index layer was formed using coating solution B below as a coating solution for forming a low refractive index layer.
  • a mixed solvent of TBA tertiary butyl alcohol
  • MIBK methyl isobutyl ketone
  • PMA propylene glycol monomethyl ether acetate
  • Example 2 A laminated film having a thickness of 44 ⁇ m and a surface smoothness of 0.4 arcmin was obtained in the same manner as in Example 1 except that the high refractive index layer and the low refractive index layer were not formed.
  • FIG. 6 shows the 30° specular reflectance spectra of the laminated films of Example 1, Comparative Example 1, and Comparative Example 2.
  • the maximum value of the 30° specular reflectance spectrum of the laminated film of Example 1 in the wavelength range of 420 nm to 680 nm was 0.85%.
  • the 30° regular reflectance at a wavelength of 450 nm was 0.15%
  • the 30° regular reflectance at a wavelength of 600 nm was 0.13%.
  • the results of Comparative Example 1 and Comparative Example 2 are as follows.
  • Example 1 The laminated films of Example 1, Comparative Example 1, and Comparative Example 2 were attached to a black acrylic board using an adhesive to obtain a measurement plate.
  • light control volume 1 from a surface emitting unit (manufactured by AItec, LED lighting box "LLBK1" installed 18 cm away from the measurement plate.
  • the appearance (reflection appearance) of the measurement plate was visually confirmed.
  • the reflection appearance is shown in FIGS. 7(a), 7(b), and 7(c). Specifically, FIG. 7(a) shows the results when white display light is irradiated, FIG. 7(b) shows the results when blue light (wavelength 450nm ⁇ 30nm) is irradiated, and FIG. c) shows the results when red light (wavelength 630 nm ⁇ 30 nm) was irradiated.
  • Example 1 Comparative Example 1
  • Comparative Example 2 Comparative Example 2
  • a surface emitting unit manufactured by AItec, LED lighting box “LLBK1”
  • a measuring plate is placed on the light emitting surface, and light is irradiated from the surface emitting unit with dimming volume 1.
  • the appearance (transmission appearance) of the measurement plate was visually confirmed. Transmission appearance is shown in FIG. 8(a), FIG. 8(b), FIG. 8(c), and FIG. 8(d).
  • Figure 8(a) shows the results when irradiated with white display light
  • Figure 8(b) shows the results when irradiated with blue light (wavelength 450nm ⁇ 30nm)
  • Figure 8(c) shows the results when irradiated with red light.
  • Wavelength 630 nm ⁇ 30 nm is shown
  • FIG. 8(d) shows the result when green light (wavelength 530 nm ⁇ 30 nm) is irradiated.
  • Example 1 has much better reflective appearance than Comparative Examples 1 and 2.
  • a black acrylic plate was used with the assumption that it would be combined with an absorptive polarizing member, but a similar difference in reflection appearance was confirmed even when a transparent glass plate was used.
  • the problem of ghosts that may occur due to reflected light in a display system can be extremely well resolved by the embodiments of the present invention.
  • FIGS. 8(a), 8(b), 8(c), and 8(d) the transmission appearance of Example 1, Comparative Example 1, and Comparative Example 2 is not significantly different. .
  • the present invention is not limited to the above embodiments, and various modifications are possible.
  • it can be replaced with a configuration that is substantially the same as the configuration shown in the above embodiment, a configuration that has the same effect, or a configuration that can achieve the same objective.
  • the lens section according to the embodiment of the present invention can be used, for example, in a display body such as VR goggles.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

L'invention concerne une unité de lentille qui peut rendre des lunettes VR légères et améliorer la visibilité. Une unité de lentille selon un mode de réalisation de la présente invention est utilisée dans un système d'affichage pour afficher une image à un utilisateur, et comprend : un élément de polarisation réfléchissant qui réfléchit la lumière qui a été émise vers l'avant à partir d'une surface d'affichage d'un élément d'affichage représentant une image et transmise à travers un élément de polarisation et un premier élément λ/4 ; une première unité de lentille disposée sur le trajet optique entre l'élément d'affichage et l'élément de polarisation réfléchissant ; un demi-miroir qui est disposé entre l'élément d'affichage et la première unité de lentille, transmet la lumière émise par l'élément d'affichage, et réfléchit la lumière réfléchie par l'élément de polarisation réfléchissant vers l'élément de polarisation réfléchissant ; une seconde unité de lentille disposée devant l'élément de polarisation réfléchissant ; un second élément λ/4 disposé sur le trajet optique entre le demi-miroir et l'élément polarisant réfléchissant ; et un élément de protection disposé sur le trajet optique entre le demi-miroir et la seconde unité de lentille, l'élément de protection étant en contact avec un espace formé entre l'élément de protection et la première unité de lentille et/ou la seconde unité de lentille, et l'élément de protection ayant une valeur maximale du spectre de réflectance positive de 30° dans la plage de longueurs d'onde de 420 à 680 nm de 1,4 % ou moins.
PCT/JP2023/008965 2022-03-14 2023-03-09 Unité de lentille et film stratifié WO2023176658A1 (fr)

Applications Claiming Priority (28)

Application Number Priority Date Filing Date Title
JP2022-039286 2022-03-14
JP2022039285 2022-03-14
JP2022039286 2022-03-14
JP2022-039285 2022-03-14
JP2022-077657 2022-05-10
JP2022077631A JP2023134316A (ja) 2022-03-14 2022-05-10 レンズ部、積層体、表示体、表示体の製造方法および表示方法
JP2022-077678 2022-05-10
JP2022077633A JP2023166826A (ja) 2022-05-10 2022-05-10 表示方法
JP2022-077634 2022-05-10
JP2022-077676 2022-05-10
JP2022077634A JP2023166827A (ja) 2022-05-10 2022-05-10 レンズ部、積層体、表示体、表示体の製造方法および表示方法
JP2022-077633 2022-05-10
JP2022077632A JP2023166825A (ja) 2022-05-10 2022-05-10 レンズ部、積層体、表示体、表示体の製造方法および表示方法
JP2022-077659 2022-05-10
JP2022077679A JP2023166854A (ja) 2022-05-10 2022-05-10 レンズ部、積層体、表示体、表示体の製造方法および表示方法
JP2022-077658 2022-05-10
JP2022077657A JP2023134317A (ja) 2022-03-14 2022-05-10 表示システム、表示方法、表示体および表示体の製造方法
JP2022-077677 2022-05-10
JP2022-077631 2022-05-10
JP2022077678A JP2023166853A (ja) 2022-05-10 2022-05-10 レンズ部、積層体、表示体、表示体の製造方法および表示方法
JP2022-077679 2022-05-10
JP2022077659A JP2023166841A (ja) 2022-05-10 2022-05-10 表示システム、表示方法、表示体および表示体の製造方法
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JP2022077658A JP2023166840A (ja) 2022-05-10 2022-05-10 表示システム、表示方法、表示体および表示体の製造方法
JP2022077676A JP2023166851A (ja) 2022-05-10 2022-05-10 レンズ部、積層体、表示体、表示体の製造方法および表示方法
JP2022077677A JP2023166852A (ja) 2022-05-10 2022-05-10 レンズ部、積層体、表示体、表示体の製造方法および表示方法
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012215790A (ja) * 2011-03-30 2012-11-08 Tamron Co Ltd 反射防止膜及び光学素子
JP2013025318A (ja) * 2012-10-11 2013-02-04 Tamron Co Ltd 反射防止膜及び光学素子
JP2015106105A (ja) * 2013-12-02 2015-06-08 セイコーエプソン株式会社 光学デバイスおよび虚像表示装置
JP2019526075A (ja) * 2016-08-02 2019-09-12 アップル インコーポレイテッドＡｐｐｌｅ Ｉｎｃ． ヘッドマウントディスプレイ用光学システム
JP2020507123A (ja) * 2017-02-23 2020-03-05 グーグル エルエルシー 折畳まれたディスプレイ光学素子を用いたコンパクトな視標追跡
WO2021145446A1 (fr) * 2020-01-15 2021-07-22 富士フイルム株式会社 Système optique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012215790A (ja) * 2011-03-30 2012-11-08 Tamron Co Ltd 反射防止膜及び光学素子
JP2013025318A (ja) * 2012-10-11 2013-02-04 Tamron Co Ltd 反射防止膜及び光学素子
JP2015106105A (ja) * 2013-12-02 2015-06-08 セイコーエプソン株式会社 光学デバイスおよび虚像表示装置
JP2019526075A (ja) * 2016-08-02 2019-09-12 アップル インコーポレイテッドＡｐｐｌｅ Ｉｎｃ． ヘッドマウントディスプレイ用光学システム
JP2020507123A (ja) * 2017-02-23 2020-03-05 グーグル エルエルシー 折畳まれたディスプレイ光学素子を用いたコンパクトな視標追跡
WO2021145446A1 (fr) * 2020-01-15 2021-07-22 富士フイルム株式会社 Système optique

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