WO2018101325A1 - Louver film - Google Patents

Louver film Download PDF

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Publication number
WO2018101325A1
WO2018101325A1 PCT/JP2017/042800 JP2017042800W WO2018101325A1 WO 2018101325 A1 WO2018101325 A1 WO 2018101325A1 JP 2017042800 W JP2017042800 W JP 2017042800W WO 2018101325 A1 WO2018101325 A1 WO 2018101325A1
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WO
WIPO (PCT)
Prior art keywords
light
louver
light transmission
width
band
Prior art date
Application number
PCT/JP2017/042800
Other languages
French (fr)
Japanese (ja)
Inventor
進 岩間
直也 瀧澤
Original Assignee
信越ポリマー株式会社
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
Application filed by 信越ポリマー株式会社 filed Critical 信越ポリマー株式会社
Priority to CN201790001426.6U priority Critical patent/CN210072116U/en
Publication of WO2018101325A1 publication Critical patent/WO2018101325A1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses

Definitions

  • the present invention relates to a louver film which is applied to, for example, a window of a building, a light transmission window such as an automobile windshield and a head-up display, and prevents a part of light incident on the light transmission window from being transmitted.
  • a blind with metal slats arranged on the indoor side of the window glass has been installed to adjust the amount of light incident from the outside. While there is an advantage that the amount of light can be easily adjusted by adjusting the louver angle of the blind, the thickness of the blind is generally thicker than that of the window glass, and may give a feeling of pressure to the indoor space. Further, when the light transmission window is curved or inclined, it is difficult to install a conventional blind along the state of the light transmission window.
  • the present inventor thinks that if a transparent film that can be brought into close contact with the light transmission window has a blind function, it can be applied to a place where it is difficult to install a conventional blind, and is pasted on a conventional liquid crystal display screen.
  • a light emission direction control sheet for example, see Patent Document 1 used for prevention of viewing was examined.
  • the present invention has been made in view of the above circumstances, and when installed on a light transmission window, a ghost image of a visual object viewed through the light transmission window is not visible, and the light transmission window is viewed from a specific direction.
  • a louver film that does not prevent transmission of incident light and prevents transmission of light incident on a light transmission window from a direction other than the specific direction.
  • a louver film comprising a louver layer in which light transmission bands and light shielding bands are alternately arranged, wherein the pitch of the light shielding bands is 300 ⁇ m or more and 1100 ⁇ m or less.
  • the aperture ratio represented by ⁇ width of the light transmission band / (width of the light transmission band + width of the light shielding band) ⁇ ⁇ 100% is 90% or more and 99.9% or less.
  • a transparent protective layer is provided on at least one of the front surface and the back surface of the louver layer.
  • the louver film of the present invention when installed on the light transmission window, the ghost image of the visual object viewed through the light transmission window is not seen, and the transmission of light incident on the light transmission window from a specific direction is prevented.
  • FIG. 1 is a perspective view showing a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along line II-II in FIG. It is an example of the utilization method of the louver film which concerns on this invention. It is another example of the usage method of the louver film which concerns on this invention.
  • FIG. 1 and 2 show a first embodiment of the louver film of the present invention
  • FIG. 1 is a perspective view
  • FIG. 2 is a cross-sectional view taken along line II-II in FIG.
  • the drawing schematically shows an enlarged part of the louver film.
  • the louver film 1 of the present embodiment includes a louver layer 10 in which a plurality of light transmission bands 11 and a plurality of light shielding bands 12 are alternately and repeatedly arranged, and a first surface provided on the entire surface of the louver layer 10.
  • the transparent protective layer 13 and the second transparent protective layer 14 provided on the entire back surface of the louver layer 10 are included.
  • the overall planar shape of the louver film 1 is a rectangle, but the planar shape is not limited to a rectangle, and can be appropriately changed according to the shape of the light transmission window to be applied.
  • the “light transmission window” means a finite two-dimensional region in an arbitrary space through which light can be transmitted. This two-dimensional region may be a flat surface or an arbitrary curved surface. In the two-dimensional region, a physical window substrate such as glass or plastic that can transmit light may or may not be installed.
  • the louver film retains its own shape as a self-supporting film.
  • the window base material can support the shape of the louver film by bringing the louver film into close contact with the window base material.
  • the size of the louver film 1 is not particularly limited.
  • the length is 1 cm to 1000 cm in the plan view
  • the size is about 1 cm to 1000 cm in the width direction
  • the length is 30 cm to 100 cm in the plan view
  • the width is about 30 cm to 100 cm. Size and the like.
  • the thickness of the louver film 1 will be described later.
  • the thickness direction of the louver layer 10 is the Z direction
  • the direction in which the light transmission band 11 and the light shielding band 12 extend is in the X direction and both the X direction and the Z direction in the plane perpendicular to the Z direction.
  • the vertical direction is the Y direction.
  • the light transmission band 11 and the light shielding band 12 constituting the louver layer 10 are both strips extending in the X direction, and a plurality of light transmission bands 11 and a plurality of light shielding bands 12 are alternately arranged in the Y direction. .
  • the width W1 in the Y direction of the plurality of light transmission bands 11 is uniform and constant in the X direction.
  • the width W2 in the Y direction of the plurality of light shielding bands 12 is also uniform and constant in the X direction.
  • the pitch P of the light shielding band 12 in the present embodiment is the total value of the width W1 of the single light transmission band 11 and the width W2 of the single light shielding band 12 in the Y direction.
  • the pitch of the light shielding bands in the louver film is determined based on a cross-sectional view of the louver layer 10 taken along the YZ plane. Specifically, the cross section perpendicular to the longitudinal direction (X direction) of the light transmission band 11 and the light shielding band 12 is observed with a digital microscope or the like, and the width of the single light transmission band 11 in the cross section image. W1 and the width W2 of the single light shielding band 12 in contact with the light transmission band 11 are measured as the length in the Y direction, and the sum of the width W1 and the width W2 is the pitch P of the light shielding band 12.
  • a resin material that transmits the target visible light wavelength is used as the material of the light transmission band 11.
  • the wavelength of light transmitted through the light transmission band 11 may be 380 nm or more and 830 nm or less of the entire visible light range, or may be a part thereof.
  • a resin material having high transparency such that the light transmittance when light is incident only on the light transmission band 11 along the Z direction in the drawing is 75% or more, preferably 85% or more is preferable.
  • thermoplastic resins and thermosetting resins having high transparency can be exemplified.
  • cellulose resin, polyolefin resin, polyester resin, silicone resin, polystyrene resin, polyvinyl chloride resin, acrylic resin, polycarbonate examples thereof include resins. Of these, silicone resins are preferable, and silicone rubber is particularly preferable in terms of heat resistance and transparency.
  • the upper limit of the light transmittance of the light transmission band 11 is 100% or less.
  • an optical path of the inspection light A is the output value of the light receiving sensor when there is no object to be measured, and the output value when the measured object is set on the optical path of the inspection light and the transmitted light transmitted through the object is received by the light receiving sensor.
  • the material of the light-shielding band 12 As the material of the light-shielding band 12, a colored resin obtained by using the above-described resin as the material of the light-transmitting band 11 as a base material and adding a colorant such as a pigment or a dye thereto is suitably used.
  • the resin material forming the light transmission band 11 and the resin material as the base material of the light shielding band 12 may be the same or different. From the point of adhesiveness to 12, it is preferable that both are the same.
  • the color tone of the light-shielding band 12 is not particularly limited as long as a preferable light-shielding property in the light-shielding band 12 can be obtained.
  • the color tone of the shading band 12 can be adjusted by the type and amount of the colorant. Specifically, it is preferable that the light transmittance is 40% or less, preferably 10% or less when light is incident only on the light shielding band 12 along the Y direction in the figure. .
  • the lower limit of the light transmittance of the light shielding band 12 is 0% or more.
  • the gloss value on the surface (XZ plane) perpendicular to the Y direction of the light shielding band 12 can be evaluated as a value at an incident angle of 60 ° in JIS Z 8741.
  • the lower the gloss value the more the light reflection by the light shielding band 12 tends to decrease. Since the color tone of the light shielding band 12 constitutes the color tone recognized when the louver layer 10 (louver film 1) is viewed, it is preferable to design in consideration of design.
  • the colorant include general organic pigments or inorganic pigments such as carbon black, bengara, iron oxide, titanium oxide, yellow iron oxide, disazo yellow, and phthalocyanine blue.
  • One colorant may be used, or two or more colorants may be used.
  • a black pigment is not used, it is preferable to use a white pigment in combination in order to obtain good light shielding properties.
  • the addition amount of the colorant added to the resin base material of the light shielding band 12 may be appropriately set in consideration that a sufficient light shielding property cannot be obtained if it is small, and that the workability is remarkably deteriorated if it is large.
  • the colorant can be added at 0.1 to 10% by mass with respect to the total mass of the resin base material of the light shielding band 12.
  • the pitch P of the light shielding band 12 of the louver layer 10 is represented by (width W1 of the light transmission band 11 + width W2 of the light shielding band 12).
  • the pitch P of the light shielding band 12 is not less than 300 ⁇ m and not more than 1100 ⁇ m, preferably not less than 350 ⁇ m and not more than 900 ⁇ m, more preferably not less than 400 ⁇ m and not more than 750 ⁇ m.
  • the amount is not more than the upper limit of the above range, it is easy to adjust the amount of light transmitted through the louver film 1 and to adjust the light transmission angle (viewing angle) ⁇ described later.
  • the pitch P becomes narrower, the amount of light transmitted through the louver film 1 decreases and the light transmission angle ⁇ becomes narrower.
  • the light transmittance in the Z direction of the louver film 1 is preferably from 50% to 90%, more preferably from 60% to 88%, and even more preferably from 65% to 85%, depending on the application.
  • the aperture ratio represented by ⁇ width W1 / light transmission band 11 / width W1 + light shielding band 12 width W2) ⁇ 100% in the Y direction is a light beam along the Z direction incident on the louver layer 10. Affects the transmittance. From the viewpoint of increasing the transmittance, it is preferable that the width W2 of the light shielding band 12 is small, the width W1 of the light transmission band 11 is large, and the aperture ratio is large. On the other hand, from the viewpoint of reducing the light transmittance of the louver layer 10 and narrowing its light transmission angle, the width W2 of the light shielding band 12 is large, the width W1 of the light transmission band 11 is small, and the aperture ratio is small. Is preferred.
  • the aperture ratio is preferably 90% or more and 99.9% or less, and 91% or more and 99% or less. Is more preferably 93% or more and 98% or less.
  • the width W1 of the light transmission band 11 in the Y direction is preferably 270 ⁇ m or more, more preferably 300 ⁇ m or more, and 400 ⁇ m or more. Is more preferable.
  • the width W1 of the light transmission band 11 is preferably 270 ⁇ m or more, more preferably 300 ⁇ m or more, and 400 ⁇ m or more. Is more preferable.
  • the width W1 of the light transmission band 11 is preferably 270 ⁇ m or more, more preferably 300 ⁇ m or more, and 400 ⁇ m or more. Is more preferable.
  • the width W1 of the light transmission band 11 in the above range a good light transmittance and light transmission angle ⁇ of light in the louver layer 10 can be obtained.
  • the upper limit value of the width W1 of the light transmission band 11 can be said to be about 1098 ⁇ m, for example.
  • 270 ⁇ m ⁇ width W1 ⁇ 1098 ⁇ m is preferable, 300 ⁇ m ⁇ width W1 ⁇ 1098 ⁇ m is more preferable, and 400 ⁇ m ⁇ width W1 ⁇ 1098 ⁇ m is more preferable.
  • the width W2 of the light shielding band 12 in the Y direction is preferably 100 ⁇ m or less, more preferably 50 ⁇ m or less, and 30 ⁇ m. The following is more preferable.
  • the lower limit value of the width W2 of the light shielding band 12 can be said to be about 1 ⁇ m in consideration of manufacturing limitations.
  • 1 ⁇ m ⁇ width W2 ⁇ 100 ⁇ m is preferable, 1 ⁇ m ⁇ width W2 ⁇ 50 ⁇ m is more preferable, and 1 ⁇ m ⁇ width W2 ⁇ 30 ⁇ m is more preferable.
  • the ratio represented by [width W2 of the light shielding band 12] / [width W1 of the light transmission band 11] is, for example, preferably 0.005 to 0.5, and more preferably 0.01 to 0.1.
  • the thickness T of the louver layer 10 in the Z direction is not particularly limited, and is preferably 350 ⁇ m or more and 3000 ⁇ m or less, for example, from the viewpoint of narrowing the light transmission angle ⁇ while suppressing reduction in light transmittance of the louver layer 10.
  • 400 ⁇ m or more and 2000 ⁇ m or less is more preferable, and 500 ⁇ m or more and 1000 ⁇ m or less is more preferable. If it is at least the lower limit of the above range, the light transmittance can be reduced so as to function as a blind, and the light transmission angle ⁇ can be narrowed. When it is below the upper limit of the above range, sufficient light transmittance and light transmission angle ⁇ can be obtained. Moreover, the installation in the light transmission window becomes easier.
  • “thickness” and “width” are obtained by observing a cross section of a measurement object using a digital microscope, a magnifying glass, or a microscope, and measuring the thickness or width of five points selected at random. The average value.
  • the light transmission angle ⁇ of the louver film 1 in a plane perpendicular to the X direction is such that the single light transmission band 11 of the louver film 1 extends from the surface as shown in FIG. This is the maximum value of the angle formed by the light rays transmitted through the back surface.
  • the light transmission angle ⁇ is determined by the thickness T of the louver layer 10 and the width W1 of the light transmission band 11 in the Y direction.
  • the light transmission angle ⁇ increases as the thickness T of the louver layer 10 decreases, and the light transmission angle ⁇ increases as the width W1 of the light transmission band 11 increases.
  • the thickness of the louver layer 10 is designed so as to obtain a desired light transmission angle ⁇ in consideration of a preferable range of the pitch P of the light shielding band 12 and the width W2 of the light shielding band 12.
  • a desired light transmission angle ⁇ in consideration of a preferable range of the pitch P of the light shielding band 12 and the width W2 of the light shielding band 12.
  • the pitch P of the light shielding bands 12 is 500 ⁇ m and the width W2 of the light shielding bands 12 is 20 ⁇ m
  • a light transmission angle ⁇ of about 100 ° is obtained.
  • the lower limit value of the thickness T of the louver layer 10 is set in consideration of a preferable range of the light transmission angle ⁇ .
  • the suitable light transmission angle ⁇ may vary depending on the use of the louver film, it is preferably 30 ° or more and 150 ° or less, more preferably 45 ° or more and 140 ° or less, and further preferably 60 ° or more and 120 ° or less.
  • the light transmission angle ⁇ of the louver film is determined based on a cross-sectional view of the louver layer 10 taken along the YZ plane, as shown in FIG.
  • the cross section perpendicular to the longitudinal direction (X direction) of the light transmission band 11 and the light shielding band 12 is observed with a digital microscope or the like, and the cross sectional image is sandwiched between two light shielding bands 12.
  • the planar shape of the single light transmission band 11 is determined, and the angle formed by the diagonal line of the planar shape is the light transmission angle ⁇ .
  • the louver layer 10 described above can be manufactured, for example, by the following method. First, a plurality of sheets of the first sheet made of the constituent material of the light transmission band 11 and the thickness W1 and a plurality of sheets of the second sheet made of the constituent material of the light shielding band 12 and the thickness W2 Are alternately laminated, and heated and pressed to form a block body in which the plurality of sheets are integrated. Next, the louver layer 10 is obtained by slicing the block body with a cut surface perpendicular to the surface of each laminated sheet constituting the block body. The thickness (slice width) when slicing is the above T.
  • the resins listed above as the material of the light transmission band 11 can be used.
  • the light transmittance when light is transmitted in the thickness direction of each layer (Z direction in the figure) for each of the first transparent protective layer 13 and the second transparent protective layer 14 is 75% or more. Is preferable, and 85% or more is more preferable.
  • the upper limit of the light transmittance is 100% or less.
  • the resin material forming each of the first transparent protective layer 13 and the second transparent protective layer 14 and the resin material forming the light transmission band 11 may be the same as each other. Well, each may be different.
  • the materials of the first transparent protective layer 13 and the second transparent protective layer 14 are polycarbonate resin, polyester resin, acrylic resin, polyolefin resin (especially cycloolefin polymer), and cellulose resin in terms of transparency and heat resistance. Among them, polycarbonate and polyester resin are more preferable. If the thickness of the first transparent protective layer 13 in the Z direction is too thin, a sufficient protective function cannot be obtained, and the light transmittance decreases as the thickness increases, so that the thickness is preferably about 0.01 mm to 0.5 mm. It is more preferably about 1 mm to 0.2 mm. If the thickness of the second transparent protective layer 14 in the Z direction is too thin, the handleability is poor, and a problem arises in workability at the time of manufacturing the louver film 1.
  • the thickness is preferably about 0.01 mm to 0.5 mm, more preferably about 0.1 mm to 0.2 mm.
  • the 1st transparent protective layer 13 and the 2nd transparent protective layer 14 are not an essential member, from a viewpoint of protecting the louver layer 10, a viewpoint which improves designability, a viewpoint which improves a light transmittance, etc., it is 1st transparent. It is preferable that at least one of the protective layer 13 and the second transparent protective layer 14 is provided, and it is preferable that both are provided.
  • the method of providing the first transparent protective layer 13 and the second transparent protective layer 14 on the front and back surfaces of the louver layer 10 is not particularly limited, and a known method can be used as appropriate.
  • a method may be used in which an adhesive is applied to the surface of the louver layer 10, a sheet made of the material of the first transparent protective layer 13 is bonded, and then the adhesive is cured.
  • the second transparent protective layer 14 can be bonded and integrated on the back surface of the louver layer 10.
  • the adhesive preferably has a high light transmittance after curing. Specifically, it is preferable that the light transmittance in the simple substance of the adhesive layer after curing is 65% or more, and more preferably 80% or more. The upper limit of the light transmittance is 100% or less.
  • the adhesive include thermosetting adhesives, multi-component reaction adhesives, and ultraviolet curable adhesives that have transparency after curing. Specifically, for example, epoxy adhesives, urethane adhesives, acrylic adhesives, melamine adhesives, polyester adhesives, silicone adhesives, and the like can be suitably used.
  • the thickness of the adhesive layer can be, for example, about 0.01 ⁇ m to 0.1 mm.
  • the louver film 1 is obtained by the method described above.
  • the louver film 1 of the present embodiment for example, by installing it in a light transmissive window such as a building window, a windshield of a car, or a head-up display, the light transmissive angle out of the light incident on the light transmissive window. Only light having a specific incident angle within the range of ⁇ can be transmitted.
  • a vector connecting the indoor observer A and the trees 3. This direction is along the thickness direction (Z direction in FIG. 2) of the light transmission band 11 and the light shielding band 12 constituting the louver layer 10 of the louver film 1.
  • the vector of light rays from the trees 3 toward the viewer A is within the range of the light transmission angle ⁇ of the louver film 1. For this reason, the observer A can visually recognize the trees 3 easily.
  • the pitch P of the louver layer is set to 300 ⁇ m or more, a ghost image of the trees 3 is not observed.
  • the angle of the vector connecting the passerby B who is outdoors and the observer A in the room is outside the range of the light transmission angle ⁇ of the louver film 1, it is difficult for the passerby B to visually recognize the observer A. It has become.
  • the angle of the vector connecting the sun S and the louver film 1 is outside the range of the light transmission angle ⁇ of the louver film 1, so that direct sunlight from the sun S is difficult to enter the room.
  • an adhesive layer may be provided as the outermost layer on the opposite side of the first transparent protective layer 13.
  • an adhesive layer can be provided on the entire back surface of the louver layer 10 without providing the second transparent protective layer 14.
  • stacked the adhesion layer on the 2nd transparent protective layer 14 can also be illustrated.
  • the material of the pressure-sensitive adhesive layer a material having high transparency is preferable, and may have a pressure-sensitive adhesive strength that can be peeled off from a window substrate such as a window glass. You may do.
  • a commercial item is applied as an adhesive which can form such an adhesion layer, for example, an acrylic adhesive, a urethane adhesive, a rubber adhesive, etc.
  • the rubber-based pressure-sensitive adhesive include silicone rubber, silicone gel, urethane rubber, and urethane gel.
  • silicone rubber is particularly preferable from the viewpoint of little adhesive residue after peeling and high transparency.
  • the formed adhesive layer may be mirror-finished. According to the above-described modification, since the louver film can be attached to the surface of the window base material, compared to the configuration in which an air layer is interposed between the louver film and the window base material, the loss of transmitted light becomes smaller.
  • the direction of the light shielding band 12 (longitudinal direction of the long side of the light shielding band 12 in the cross section) in the cross section (YZ cross section) in FIG. 2 is parallel to the thickness direction (Z direction) of the louver film 1.
  • the direction of the light shielding band 12 may be inclined with respect to the Z direction.
  • the direction of the light shielding band 12 of the louver film 1 installed on the window glass on the second floor of the building 2 is along the direction in which the indoor observer A looks down on the ground.
  • the configuration in which the direction of is tilted with respect to the Z direction (the thickness direction of the window glass) is mentioned. According to this configuration, it is easy for the observer A in the room to observe the visual object 3 on the ground, and direct sunlight from the sun S in the direction in which the observer A looks up can be suppressed. .
  • Example 1 A louver film 1 having the structure shown in FIGS. First, a first sheet having a thickness of 480 ⁇ m made of transparent silicone rubber (trade name: KE153U, manufactured by Shin-Etsu Chemical Co., Ltd.) was prepared as the light transmission band 11. Separately, a second sheet having a thickness of 20 ⁇ m made of a black material obtained by adding carbon black to transparent silicone rubber (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KE153U) was prepared as the light shielding band 12. Next, after laminating a plurality of first sheets and a plurality of second sheets alternately, heat vulcanization and pressurization were performed to form a block body in which these sheets were integrated.
  • transparent silicone rubber trade name: KE153U, manufactured by Shin-Etsu Chemical Co., Ltd.
  • the louver layer 10 was produced by slicing the block body to a thickness of 740 ⁇ m with a cut surface perpendicular to the sheet surface. Subsequently, a polycarbonate sheet (first and second transparent protective layers 13, 100 ⁇ m) obtained by applying a thermosetting adhesive (trade name: KE1825, manufactured by Shin-Etsu Chemical Co., Ltd.) to both surfaces of the obtained louver layer 10.
  • the louver film 1 was produced by bonding and thermosetting 14).
  • the pitch P of the light shielding band 12 is 500 ⁇ m
  • the width of the light shielding band 12 is 20 ⁇ m
  • the thickness of the louver layer 10 is 740 ⁇ m.
  • the measurement angle that is, changing the angle between the Z direction and the optical axis from the light source to the light receiver in the YZ plane of FIGS.
  • the rate was measured.
  • the light transmission angle ⁇ of the louver film 1 of this example was 100 °
  • the light transmittance in the Z direction was 80%.
  • the light transmittance of light incident from an angle exceeding the light transmission angle ⁇ was less than 5%.
  • louver film 1 of this example Holding the louver film 1 of this example in the hand and holding the louver film in the direction of the line of sight with the arms extended, the following visual objects were observed through the louver film 1.
  • the ghost image When viewing the horizontal red lines displayed on the outdoor buildings, outdoor signals, ceiling fluorescent lights, and PC liquid crystal screens as sighted objects, the ghost image is not seen and the sight is well visible. I was able to.
  • the light transmittance in the range exceeding the light transmission angle ⁇ was low, and it was confirmed that the function as a blind was sufficiently exhibited.
  • Example 1 A louver film was produced in the same manner as in Example 1 except that the thickness of the first sheet in Example 1 was changed to 130 ⁇ m to form a louver layer.
  • the pitch P of the light shielding band 12 is 150 ⁇ m
  • the width of the light shielding band is 20 ⁇ m
  • the thickness of the louver layer is 200 ⁇ m.
  • the light transmission angle ⁇ of this louver film was about 100 °.
  • the same observation experiment as in Example 1 was performed using the louver film of the comparative example.
  • the louver film of the present invention can be widely used for building windows, automobile windshields, head-up displays, and the like.

Abstract

A louver film (1) equipped with a louver layer (10) in which light transmission bands (11) and light shielding bands (12) are alternately arranged, wherein the light shielding bands (12) are disposed at a pitch of 300-1100 μm.

Description

ルーバーフィルムLouver film
　本発明は、例えば、建物の窓、自動車のフロントガラスやヘッドアップディスプレイ等の光透過窓に適用され、その光透過窓に入射する光の一部の透過を妨げる、ルーバーフィルムに関する。
　本願は、２０１６年１１月２９日に、日本に出願された特願２０１６－２３０９９９号に基づき優先権を主張し、その内容をここに援用する。 The present invention relates to a louver film which is applied to, for example, a window of a building, a light transmission window such as an automobile windshield and a head-up display, and prevents a part of light incident on the light transmission window from being transmitted.
This application claims priority on November 29, 2016 based on Japanese Patent Application No. 2016-230999 filed in Japan, the contents of which are incorporated herein by reference.
　従来、窓ガラスの室内側に金属製の羽板が並んだブラインドを設置して、外部から入射する光量を調節することが行われている。ブラインドのルーバー角を調節することによって光量を容易に調節できる利点がある一方、ブラインドの厚みは一般に窓ガラスよりも厚く、室内側の空間に圧迫感を与えることがある。また、光透過窓が湾曲していたり、傾斜していたりする場合には、その光透過窓の状態に沿って従来のブラインドを設置することが困難である。 Conventionally, a blind with metal slats arranged on the indoor side of the window glass has been installed to adjust the amount of light incident from the outside. While there is an advantage that the amount of light can be easily adjusted by adjusting the louver angle of the blind, the thickness of the blind is generally thicker than that of the window glass, and may give a feeling of pressure to the indoor space. Further, when the light transmission window is curved or inclined, it is difficult to install a conventional blind along the state of the light transmission window.
　そこで、本発明者は光透過窓に密着させることが可能な透明フィルムがブラインド機能を有すれば、従来のブラインドを設置し難い箇所に適用できると考え、従来の液晶表示画面に貼り付けて覗き見防止のために使用される光出射方向制御シート（例えば特許文献１参照）の適用を検討した。 Therefore, the present inventor thinks that if a transparent film that can be brought into close contact with the light transmission window has a blind function, it can be applied to a place where it is difficult to install a conventional blind, and is pasted on a conventional liquid crystal display screen. The application of a light emission direction control sheet (for example, see Patent Document 1) used for prevention of viewing was examined.
日本国特開２００６－３３７８３７号公報Japanese Unexamined Patent Publication No. 2006-337837
　しかしながら、従来の光射出方向制御フィルムを光透過窓に貼り付けて、室内側から外部の風景を見たときに、視認対象物が複数に重なったゴースト像が見えてしまう問題がある。本発明者が更に検討したところ、この現象は観察者の生理学的な現象ではなく、光出射方向制御フィルムが回折格子として機能することによる物理的な現象であることが分かった。 However, when a conventional light emission direction control film is attached to the light transmission window and an external landscape is viewed from the indoor side, there is a problem that a ghost image in which a plurality of objects to be viewed overlap is seen. Further examination by the present inventor has revealed that this phenomenon is not a physiological phenomenon of the observer but a physical phenomenon caused by the function of the light emission direction control film as a diffraction grating.
　本発明は、前記事情に鑑みてなされたものであって、光透過窓に設置したときに、光透過窓を透かして見た視認対象物のゴースト像が見えず、特定方向から光透過窓に入射する光の透過を妨げず、その特定方向以外から光透過窓に入射する光の透過を妨げる、ルーバーフィルムを提供する。 The present invention has been made in view of the above circumstances, and when installed on a light transmission window, a ghost image of a visual object viewed through the light transmission window is not visible, and the light transmission window is viewed from a specific direction. Provided is a louver film that does not prevent transmission of incident light and prevents transmission of light incident on a light transmission window from a direction other than the specific direction.
［１］　光透過帯と遮光帯とが交互に配されているルーバー層を備えたルーバーフィルムであって、前記遮光帯のピッチが３００μｍ以上１１００μｍ以下であることを特徴とするルーバーフィルム。
［２］　｛前記光透過帯の幅／（前記光透過帯の幅＋前記遮光帯の幅）｝×１００％で表される開口率が９０％以上９９．９％以下であることを特徴とする［１］記載のルーバーフィルム。
［３］　前記ルーバー層の厚さが３５０μｍ以上３０００μｍ以下であることを特徴とする［１］又は［２］に記載のルーバーフィルム。
［４］　前記光透過帯の幅が、２７０μｍ以上１０９８μｍ以下であることを特徴とする［１］～［３］の何れか一項に記載のルーバーフィルム。
［５］　前記遮光帯の幅が、１μｍ以上１００μｍ以下であることを特徴とする［１］～［４］の何れか一項に記載のルーバーフィルム。
［６］　［前記遮光帯の幅］／［前記光透過帯の幅］で表される比が、０．００５～０．５であることを特徴とする［１］～［５］の何れか一項に記載のルーバーフィルム。
［７］　前記ルーバー層の平面視のサイズが、縦１ｃｍ～１０００ｃｍであり、且つ、横１ｃｍ～１０００ｃｍであることを特徴とする［１］～［６］の何れか一項に記載のルーバーフィルム。
［８］　前記ルーバー層の表面及び裏面のうち少なくとも一方に透明保護層が設けられていることを特徴とする［１］～［７］の何れか一項に記載のルーバーフィルム。 [1] A louver film comprising a louver layer in which light transmission bands and light shielding bands are alternately arranged, wherein the pitch of the light shielding bands is 300 μm or more and 1100 μm or less.
[2] The aperture ratio represented by {width of the light transmission band / (width of the light transmission band + width of the light shielding band)} × 100% is 90% or more and 99.9% or less. The louver film according to [1].
[3] The louver film according to [1] or [2], wherein the louver layer has a thickness of 350 μm or more and 3000 μm or less.
[4] The louver film according to any one of [1] to [3], wherein a width of the light transmission band is 270 μm or more and 1098 μm or less.
[5] The louver film according to any one of [1] to [4], wherein a width of the light shielding band is 1 μm or more and 100 μm or less.
[6] Any one of [1] to [5], wherein a ratio represented by [width of the light shielding band] / [width of the light transmission band] is 0.005 to 0.5. The louver film according to one item.
[7] The louver film according to any one of [1] to [6], wherein the size of the louver layer in a plan view is 1 cm to 1000 cm in length and 1 cm to 1000 cm in width. .
[8] The louver film according to any one of [1] to [7], wherein a transparent protective layer is provided on at least one of the front surface and the back surface of the louver layer.
　本発明のルーバーフィルムによれば、光透過窓に設置したときに、光透過窓を透かして見た視認対象物のゴースト像が見えず、特定方向から光透過窓に入射する光の透過を妨げず、その特定方向以外から光透過窓に入射する光の透過を抑制することができる。これにより、光透過窓から入射する光量を調節したり、外部からの室内側の覗き見を防止したり、光透過窓から離れた位置に設置されたディスプレイからの表示を所定の方向から視認し難くしたりすることができる。 According to the louver film of the present invention, when installed on the light transmission window, the ghost image of the visual object viewed through the light transmission window is not seen, and the transmission of light incident on the light transmission window from a specific direction is prevented. However, it is possible to suppress transmission of light incident on the light transmission window from other than the specific direction. This allows you to adjust the amount of light incident from the light transmission window, prevent peeping indoors from the outside, and view the display from a display installed at a position away from the light transmission window from a predetermined direction. It can be difficult.
本発明の第１実施形態を示す斜視図である。1 is a perspective view showing a first embodiment of the present invention. 図１中のＩＩ－ＩＩ線に沿う断面図である。FIG. 2 is a cross-sectional view taken along line II-II in FIG. 本発明に係るルーバーフィルムの利用方法の一例である。It is an example of the utilization method of the louver film which concerns on this invention. 本発明に係るルーバーフィルムの利用方法の別の一例である。It is another example of the usage method of the louver film which concerns on this invention.
＜第一の実施形態＞
　図１、２は本発明のルーバーフィルムの第一実施形態を示したものであり、図１は斜視図であり、図２は図１中のＩＩ－ＩＩ線に沿う断面図である。なお、図面はルーバーフィルムの一部を拡大して模式的に示している。
　本実施形態のルーバーフィルム１は、複数の光透過帯１１と複数の遮光帯１２とが交互に繰り返して配されているルーバー層１０と、ルーバー層１０の表面の全体に設けられた第１の透明保護層１３と、ルーバー層１０の裏面の全面に設けられた第２の透明保護層１４とを有する。 <First embodiment>
1 and 2 show a first embodiment of the louver film of the present invention, FIG. 1 is a perspective view, and FIG. 2 is a cross-sectional view taken along line II-II in FIG. The drawing schematically shows an enlarged part of the louver film.
The louver film 1 of the present embodiment includes a louver layer 10 in which a plurality of light transmission bands 11 and a plurality of light shielding bands 12 are alternately and repeatedly arranged, and a first surface provided on the entire surface of the louver layer 10. The transparent protective layer 13 and the second transparent protective layer 14 provided on the entire back surface of the louver layer 10 are included.
　ルーバーフィルム１の全体の平面形状は矩形であるが、この平面形状は矩形に限定されず、適用する光透過窓の形状に応じて適宜変更できる。ここで「光透過窓」とは、光が透過可能な任意の空間における有限の二次元領域を意味する。この二次元領域は、平面であってもよいし、任意の曲面であってもよい。前記二次元領域には、光が透過可能なガラス、プラスチック等の物理的な窓基材が設置されていてもよいし、設置されていなくてもよい。窓基材が設置されていない場合には、ルーバーフィルムは自立型のフィルムとして自己の形状を保持することが好ましい。窓基材が設置されている場合には、ルーバーフィルムをその窓基材に密着させることにより、窓基材がルーバーフィルムの形状を支持することができる。ルーバーフィルム１のサイズは特に限定されないが、例えば、平面視で縦が１ｃｍ～１０００ｃｍであり、横が１ｃｍ～１０００ｃｍ程度のサイズ、平面視で縦が３０ｃｍ～１００ｃｍであり、横が３０ｃｍ～１００ｃｍ程度のサイズ等が挙げられる。ルーバーフィルム１の厚さについては後述する。 The overall planar shape of the louver film 1 is a rectangle, but the planar shape is not limited to a rectangle, and can be appropriately changed according to the shape of the light transmission window to be applied. Here, the “light transmission window” means a finite two-dimensional region in an arbitrary space through which light can be transmitted. This two-dimensional region may be a flat surface or an arbitrary curved surface. In the two-dimensional region, a physical window substrate such as glass or plastic that can transmit light may or may not be installed. When the window base material is not installed, it is preferable that the louver film retains its own shape as a self-supporting film. When the window base material is installed, the window base material can support the shape of the louver film by bringing the louver film into close contact with the window base material. The size of the louver film 1 is not particularly limited. For example, the length is 1 cm to 1000 cm in the plan view, the size is about 1 cm to 1000 cm in the width direction, the length is 30 cm to 100 cm in the plan view, and the width is about 30 cm to 100 cm. Size and the like. The thickness of the louver film 1 will be described later.
　本実施形態においてルーバー層１０の厚さ方向をＺ方向、Ｚ方向に垂直な面内において、光透過帯１１および遮光帯１２が延びている方向をＸ方向、Ｘ方向とＺ方向の両方に対して垂直な方向をＹ方向とする。ルーバー層１０を構成している光透過帯１１および遮光帯１２はいずれもＸ方向に延びる帯状であり、Ｙ方向において複数の光透過帯１１と複数の遮光帯１２とが交互に配されている。複数の光透過帯１１のＹ方向の幅Ｗ１は均一であり、かつＸ方向において一定である。複数の遮光帯１２のＹ方向の幅Ｗ２も均一であり、かつＸ方向において一定である。
　本実施形態における遮光帯１２のピッチＰは、Ｙ方向における単一の光透過帯１１の幅Ｗ１と単一の遮光帯１２の幅Ｗ２の合計値である。
　ルーバーフィルムにおける遮光帯のピッチは、図２に示すように、ルーバー層１０のＹ－Ｚ平面を切り出した断面図に基づいて決定される。具体的には、光透過帯１１及び遮光帯１２の長手方向（Ｘ方向）に対して垂直な前記断面をデジタルマイクロスコープ等で観察し、その断面画像において、単一の光透過帯１１の幅Ｗ１と、その光透過帯１１に接する単一の遮光帯１２の幅Ｗ２をＹ方向の長さとして測定し、その幅Ｗ１と幅Ｗ２の和が遮光帯１２のピッチＰである。 In this embodiment, the thickness direction of the louver layer 10 is the Z direction, and the direction in which the light transmission band 11 and the light shielding band 12 extend is in the X direction and both the X direction and the Z direction in the plane perpendicular to the Z direction. The vertical direction is the Y direction. The light transmission band 11 and the light shielding band 12 constituting the louver layer 10 are both strips extending in the X direction, and a plurality of light transmission bands 11 and a plurality of light shielding bands 12 are alternately arranged in the Y direction. . The width W1 in the Y direction of the plurality of light transmission bands 11 is uniform and constant in the X direction. The width W2 in the Y direction of the plurality of light shielding bands 12 is also uniform and constant in the X direction.
The pitch P of the light shielding band 12 in the present embodiment is the total value of the width W1 of the single light transmission band 11 and the width W2 of the single light shielding band 12 in the Y direction.
As shown in FIG. 2, the pitch of the light shielding bands in the louver film is determined based on a cross-sectional view of the louver layer 10 taken along the YZ plane. Specifically, the cross section perpendicular to the longitudinal direction (X direction) of the light transmission band 11 and the light shielding band 12 is observed with a digital microscope or the like, and the width of the single light transmission band 11 in the cross section image. W1 and the width W2 of the single light shielding band 12 in contact with the light transmission band 11 are measured as the length in the Y direction, and the sum of the width W1 and the width W2 is the pitch P of the light shielding band 12.
　光透過帯１１の材料としては、目的の可視光の波長を透過させる樹脂材料が用いられる。光透過帯１１を透過する光の波長は可視光の全範囲３８０ｎｍ以上８３０ｎｍ以下であってもよいし、その一部であってもよい。図中Ｚ方向に沿って光透過帯１１のみに対して光を入射させたときの光線透過率が７５％以上、好ましくは８５％以上であるような、高い透明性を有する樹脂材料が好ましい。具体的には、透明性が高い熱可塑性樹脂や熱硬化性樹脂を例示でき、例えば、セルロース系樹脂、ポリオレフィン系樹脂、ポリエステル系樹脂、シリコーン樹脂、ポリスチレン樹脂、ポリ塩化ビニル樹脂、アクリル樹脂、ポリカーボネート樹脂等が挙げられる。中でもシリコーン樹脂が好ましく、耐熱性、透明性の点でシリコーンゴムが特に好ましい。光透過帯１１の光線透過率の上限値は１００％以下である。 As the material of the light transmission band 11, a resin material that transmits the target visible light wavelength is used. The wavelength of light transmitted through the light transmission band 11 may be 380 nm or more and 830 nm or less of the entire visible light range, or may be a part thereof. A resin material having high transparency such that the light transmittance when light is incident only on the light transmission band 11 along the Z direction in the drawing is 75% or more, preferably 85% or more is preferable. Specifically, thermoplastic resins and thermosetting resins having high transparency can be exemplified. For example, cellulose resin, polyolefin resin, polyester resin, silicone resin, polystyrene resin, polyvinyl chloride resin, acrylic resin, polycarbonate Examples thereof include resins. Of these, silicone resins are preferable, and silicone rubber is particularly preferable in terms of heat resistance and transparency. The upper limit of the light transmittance of the light transmission band 11 is 100% or less.
　本発明における「光線透過率」の値は、光源としてＪＩＳ　Ｚ　８７２０に規定されるＤ６５を用い、光源から出射された検査光の強度を受光センサーで測定する装置において、前記検査光の光路上に被測定物が無い状態での受光センサーの出力値をＡ、検査光の光路上に被測定物をセットし、被測定物を透過した透過光が受光センサーで受光される状態での出力値をＢとするとき、光線透過率＝（Ｂ／Ａ）×１００（単位；％）で求められる値とする。 The value of the "light transmittance" in the present invention, using a D 65 as defined in JIS Z 8720 as a light source, in the apparatus for measuring the intensity of the inspection light emitted from the light source by the light receiving sensor, an optical path of the inspection light A is the output value of the light receiving sensor when there is no object to be measured, and the output value when the measured object is set on the optical path of the inspection light and the transmitted light transmitted through the object is received by the light receiving sensor. Where B is the light transmittance = (B / A) × 100 (unit:%).
　遮光帯１２の材料としては、光透過帯１１の材料として上記に挙げた樹脂を基材とし、これに顔料や染料等の着色剤を添加してなる着色樹脂が好適に用いられる。
　ルーバー層１０において、光透過帯１１をなしている樹脂材料と、遮光帯１２の基材としての樹脂材料とは同じであってもよく、異なっていてもよいが、光透過帯１１と遮光帯１２との接着性の点からは両者が同じであることが好ましい。 As the material of the light-shielding band 12, a colored resin obtained by using the above-described resin as the material of the light-transmitting band 11 as a base material and adding a colorant such as a pigment or a dye thereto is suitably used.
In the louver layer 10, the resin material forming the light transmission band 11 and the resin material as the base material of the light shielding band 12 may be the same or different. From the point of adhesiveness to 12, it is preferable that both are the same.
　遮光帯１２の色調は、遮光帯１２における好ましい遮光性が得られればよく、例えば黒、赤、黄、緑、青、水色等とすることができる。遮光帯１２の色調は、着色剤の種類および添加量によって調整できる。具体的には、図中Ｙ方向に沿って遮光帯１２のみに対して光を入射させたときの光線透過率が４０％以下、好ましくは１０％以下となるような遮光性を有することが好ましい。遮光帯１２の光線透過率の下限値は０％以上である。
　遮光帯１２のＹ方向と直行する面（Ｘ－Ｚ平面）における光沢値は、ＪＩＳ　Ｚ　８７４１における入射角度６０°での値として評価することができる。通常、光沢値が低いほど、遮光帯１２による光の反射が低減する傾向がある。
　遮光帯１２の色調は、ルーバー層１０（ルーバーフィルム１）を見たときに認識される色調を構成するので意匠性も考慮して設計することが好ましい。 The color tone of the light-shielding band 12 is not particularly limited as long as a preferable light-shielding property in the light-shielding band 12 can be obtained. The color tone of the shading band 12 can be adjusted by the type and amount of the colorant. Specifically, it is preferable that the light transmittance is 40% or less, preferably 10% or less when light is incident only on the light shielding band 12 along the Y direction in the figure. . The lower limit of the light transmittance of the light shielding band 12 is 0% or more.
The gloss value on the surface (XZ plane) perpendicular to the Y direction of the light shielding band 12 can be evaluated as a value at an incident angle of 60 ° in JIS Z 8741. Usually, the lower the gloss value, the more the light reflection by the light shielding band 12 tends to decrease.
Since the color tone of the light shielding band 12 constitutes the color tone recognized when the louver layer 10 (louver film 1) is viewed, it is preferable to design in consideration of design.
　着色剤の具体例としては、カーボンブラック、ベンガラ、酸化鉄、酸化チタン、黄色酸化鉄、ジスアゾイエロー、フタロシアニンブルー等の一般的な有機顔料あるいは無機顔料が挙げられる。着色剤は１種でもよく、２種以上を用いてもよい。黒色顔料を用いない場合は、良好な遮光性を得るために白色顔料を併用することが好ましい。
　遮光帯１２の樹脂基材に添加する着色剤の添加量は、少ないと十分な遮光性が得られず、多いと加工性の悪化が著しくなることを考慮して適宜設定すればよい。例えば、遮光帯１２の樹脂基材の総質量に対して、着色剤を０．１～１０質量％で添加することができる。 Specific examples of the colorant include general organic pigments or inorganic pigments such as carbon black, bengara, iron oxide, titanium oxide, yellow iron oxide, disazo yellow, and phthalocyanine blue. One colorant may be used, or two or more colorants may be used. When a black pigment is not used, it is preferable to use a white pigment in combination in order to obtain good light shielding properties.
The addition amount of the colorant added to the resin base material of the light shielding band 12 may be appropriately set in consideration that a sufficient light shielding property cannot be obtained if it is small, and that the workability is remarkably deteriorated if it is large. For example, the colorant can be added at 0.1 to 10% by mass with respect to the total mass of the resin base material of the light shielding band 12.
　図２に示すように、ルーバー層１０の遮光帯１２のピッチＰは、（光透過帯１１の幅Ｗ１＋遮光帯１２の幅Ｗ２）で表される。この遮光帯１２のピッチＰは３００μｍ以上１１００μｍ以下であり、３５０μｍ以上９００μｍ以下が好ましく、４００μｍ以上７５０μｍ以下がより好ましい。
　上記範囲の下限値以上であると、前述した視認対象物のゴースト像が見える現象を充分に防ぐことができる。
　上記範囲の上限値以下であると、ルーバーフィルム１を透過する光量の調節や、後述する光透過角度（視認角度）θの調節が容易になる。通常、ピッチＰが狭くなるほど、ルーバーフィルム１を透過する光量は低減し、光透過角度θが狭くなる。 As shown in FIG. 2, the pitch P of the light shielding band 12 of the louver layer 10 is represented by (width W1 of the light transmission band 11 + width W2 of the light shielding band 12). The pitch P of the light shielding band 12 is not less than 300 μm and not more than 1100 μm, preferably not less than 350 μm and not more than 900 μm, more preferably not less than 400 μm and not more than 750 μm.
The phenomenon which the ghost image of the visual recognition target object mentioned above can be seen enough that it is more than the lower limit of the said range can fully be prevented.
When the amount is not more than the upper limit of the above range, it is easy to adjust the amount of light transmitted through the louver film 1 and to adjust the light transmission angle (viewing angle) θ described later. Usually, as the pitch P becomes narrower, the amount of light transmitted through the louver film 1 decreases and the light transmission angle θ becomes narrower.
　ルーバーフィルム１のＺ方向における光線透過率は、その用途にもよるが、５０％以上９０％以下が好ましく、６０％以上８８％以下がより好ましく、６５％以上８５％以下がさらに好ましい。 The light transmittance in the Z direction of the louver film 1 is preferably from 50% to 90%, more preferably from 60% to 88%, and even more preferably from 65% to 85%, depending on the application.
　Ｙ方向における｛光透過帯１１の幅Ｗ１／（光透過帯１１の幅Ｗ１＋遮光帯１２の幅Ｗ２）｝×１００％で表される開口率は、ルーバー層１０に入射するＺ方向に沿う光線の透過率に影響する。この透過率を大きくする観点に立つと、遮光帯１２の幅Ｗ２が小さく、光透過帯１１の幅Ｗ１が大きく、開口率が大きい方が好ましい。一方、ルーバー層１０の光線の透過率を小さくし、その光透過角度を狭くする観点に立つと、遮光帯１２の幅Ｗ２が大きく、光透過帯１１の幅Ｗ１が小さく、開口率が小さい方が好ましい。これらの観点のバランスを取って、光透過窓を通した視認対象物の視認性をより向上する観点から、前記開口率は、９０％以上９９．９％以下が好ましく、９１％以上９９％以下がより好ましく、９３％以上９８％以下がさらに好ましい。 The aperture ratio represented by {width W1 / light transmission band 11 / width W1 + light shielding band 12 width W2) × 100% in the Y direction is a light beam along the Z direction incident on the louver layer 10. Affects the transmittance. From the viewpoint of increasing the transmittance, it is preferable that the width W2 of the light shielding band 12 is small, the width W1 of the light transmission band 11 is large, and the aperture ratio is large. On the other hand, from the viewpoint of reducing the light transmittance of the louver layer 10 and narrowing its light transmission angle, the width W2 of the light shielding band 12 is large, the width W1 of the light transmission band 11 is small, and the aperture ratio is small. Is preferred. From the viewpoint of balancing these viewpoints and further improving the visibility of the visual target through the light transmission window, the aperture ratio is preferably 90% or more and 99.9% or less, and 91% or more and 99% or less. Is more preferably 93% or more and 98% or less.
　ルーバー層１０において、光線透過率の低減を抑制し、光透過角度θを拡げる観点に立つと、Ｙ方向における光透過帯１１の幅Ｗ１は、２７０μｍ以上が好ましく、３００μｍ以上がより好ましく、４００μｍ以上がさらに好ましい。光透過帯１１の幅Ｗ１を上記の範囲とすることにより、ルーバー層１０における光線の良好な光線透過率及び光透過角度θを得ることができる。また、ブラインドとして機能するように光線透過率を低減し、光透過角度θを狭める目的からすると、光透過帯１１の幅Ｗ１の上限値は、例えば、１０９８μｍ程度といえる。したがって、例えば、２７０μｍ≦幅Ｗ１≦１０９８μｍが好ましく、３００μｍ≦幅Ｗ１≦１０９８μｍがより好ましく、４００μｍ≦幅Ｗ１≦１０９８μｍがさらに好ましい。 In the louver layer 10, from the viewpoint of suppressing the reduction of light transmittance and expanding the light transmission angle θ, the width W1 of the light transmission band 11 in the Y direction is preferably 270 μm or more, more preferably 300 μm or more, and 400 μm or more. Is more preferable. By setting the width W1 of the light transmission band 11 in the above range, a good light transmittance and light transmission angle θ of light in the louver layer 10 can be obtained. For the purpose of reducing the light transmittance so as to function as a blind and narrowing the light transmission angle θ, the upper limit value of the width W1 of the light transmission band 11 can be said to be about 1098 μm, for example. Therefore, for example, 270 μm ≦ width W1 ≦ 1098 μm is preferable, 300 μm ≦ width W1 ≦ 1098 μm is more preferable, and 400 μm ≦ width W1 ≦ 1098 μm is more preferable.
　ルーバー層１０において、光線透過率の低減を抑制し、光透過角度θを拡げる観点に立つと、Ｙ方向における遮光帯１２の幅Ｗ２は１００μｍ以下であることが好ましく、５０μｍ以下がより好ましく、３０μｍ以下がさらに好ましい。遮光帯１２の幅Ｗ２を上記の範囲とすることにより、ルーバー層１０における光線の良好な光線透過率及び光透過角度θを得ることができる。遮光帯１２の幅Ｗ２の下限値は、製造上の限界を考慮すると、１μｍ程度といえる。したがって、例えば、１μｍ≦幅Ｗ２≦１００μｍが好ましく、１μｍ≦幅Ｗ２≦５０μｍがより好ましく、１μｍ≦幅Ｗ２≦３０μｍがさらに好ましい。 In the louver layer 10, from the viewpoint of suppressing the reduction of light transmittance and expanding the light transmission angle θ, the width W2 of the light shielding band 12 in the Y direction is preferably 100 μm or less, more preferably 50 μm or less, and 30 μm. The following is more preferable. By setting the width W2 of the light-shielding band 12 in the above range, a good light transmittance and light transmission angle θ of light in the louver layer 10 can be obtained. The lower limit value of the width W2 of the light shielding band 12 can be said to be about 1 μm in consideration of manufacturing limitations. Therefore, for example, 1 μm ≦ width W2 ≦ 100 μm is preferable, 1 μm ≦ width W2 ≦ 50 μm is more preferable, and 1 μm ≦ width W2 ≦ 30 μm is more preferable.
　［遮光帯１２の幅Ｗ２］／［光透過帯１１の幅Ｗ１］で表される比は、例えば、０．００５～０．５が好ましく、０．０１～０．１が好ましい。 The ratio represented by [width W2 of the light shielding band 12] / [width W1 of the light transmission band 11] is, for example, preferably 0.005 to 0.5, and more preferably 0.01 to 0.1.
　Ｚ方向におけるルーバー層１０の厚さＴは、特に限定されず、ルーバー層１０の光線透過率の低減を抑制しつつ、光透過角度θを狭める観点に立つと、例えば、３５０μｍ以上３０００μｍ以下が好ましく、４００μｍ以上２０００μｍ以下がより好ましく、５００μｍ以上１０００μｍ以下がさらに好ましい。
　上記範囲の下限値以上であると、ブラインドとして機能するように光線透過率を低減し、光透過角度θを狭めることができる。
　上記範囲の上限値以下であると、充分な光線透過率及び光透過角度θが得られる。また、光透過窓における設置がより容易になる。
　本明細書において、「厚さ」及び「幅」は、デジタルマイクロスコープ、拡大鏡又は顕微鏡を用いて測定対象の断面を観察し、無作為に選択される５箇所の厚さ又は幅を測定し、平均した値である。 The thickness T of the louver layer 10 in the Z direction is not particularly limited, and is preferably 350 μm or more and 3000 μm or less, for example, from the viewpoint of narrowing the light transmission angle θ while suppressing reduction in light transmittance of the louver layer 10. 400 μm or more and 2000 μm or less is more preferable, and 500 μm or more and 1000 μm or less is more preferable.
If it is at least the lower limit of the above range, the light transmittance can be reduced so as to function as a blind, and the light transmission angle θ can be narrowed.
When it is below the upper limit of the above range, sufficient light transmittance and light transmission angle θ can be obtained. Moreover, the installation in the light transmission window becomes easier.
In this specification, “thickness” and “width” are obtained by observing a cross section of a measurement object using a digital microscope, a magnifying glass, or a microscope, and measuring the thickness or width of five points selected at random. The average value.
　Ｘ方向に垂直な面（Ｙ－Ｚ面、図２における紙面）内におけるルーバーフィルム１の光透過角度θは、図２に示すように、ルーバーフィルム１の単一の光透過帯１１を表面から裏面に透過する光線群が互いに成す角度の最大値である。光透過角度θは、ルーバー層１０の厚さＴとＹ方向における光透過帯１１の幅Ｗ１によって決まる。ルーバー層１０の厚さＴが薄いほど光透過角度θは大きくなり、光透過帯１１の幅Ｗ１が大きいほど光透過角度θは大きくなる。
　したがって、ルーバー層１０の厚さは、遮光帯１２のピッチＰと遮光帯１２の幅Ｗ２の好ましい範囲も考慮して、所望の光透過角度θが得られるように設計することが好ましい。
　例えば、遮光帯１２のピッチＰが５００μｍで、遮光帯１２の幅Ｗ２が２０μｍの場合に、ルーバー層１０の厚さＴが７４０μｍであれば約１００°の光透過角度θが得られる。
　ルーバー層１０の厚さＴの下限値は、好ましい光透過角度θの範囲を考慮して設定される。 The light transmission angle θ of the louver film 1 in a plane perpendicular to the X direction (YZ plane, the paper surface in FIG. 2) is such that the single light transmission band 11 of the louver film 1 extends from the surface as shown in FIG. This is the maximum value of the angle formed by the light rays transmitted through the back surface. The light transmission angle θ is determined by the thickness T of the louver layer 10 and the width W1 of the light transmission band 11 in the Y direction. The light transmission angle θ increases as the thickness T of the louver layer 10 decreases, and the light transmission angle θ increases as the width W1 of the light transmission band 11 increases.
Therefore, it is preferable that the thickness of the louver layer 10 is designed so as to obtain a desired light transmission angle θ in consideration of a preferable range of the pitch P of the light shielding band 12 and the width W2 of the light shielding band 12.
For example, when the pitch P of the light shielding bands 12 is 500 μm and the width W2 of the light shielding bands 12 is 20 μm, if the thickness T of the louver layer 10 is 740 μm, a light transmission angle θ of about 100 ° is obtained.
The lower limit value of the thickness T of the louver layer 10 is set in consideration of a preferable range of the light transmission angle θ.
　ルーバーフィルムにおける光透過角度θが小さ過ぎると光透過窓を通して反対側の視認対象物を見づらくなることがある。一方、光透過角度θが大き過ぎると、光透過窓から入射する光量を調節したり、外部からの室内側の覗き見を抑制したりすることが難しくなることがある。ルーバーフィルムの用途によってその好適な光透過角度θは変わり得るが、例えば、３０°以上１５０°以下が好ましく、４５°以上１４０°以下がより好ましく、６０°以上１２０°以下がさらに好ましい。
　ルーバーフィルムの光透過角度θは、図２に示すように、ルーバー層１０のＹ－Ｚ平面を切り出した断面図に基づいて決定される。具体的には、光透過帯１１及び遮光帯１２の長手方向（Ｘ方向）に対して垂直な前記断面をデジタルマイクロスコープ等で観察し、その断面画像において、２つの遮光帯１２に挟まれた単一の光透過帯１１の平面形状を決定し、その平面形状の対角線がなす角が光透過角度θである。 If the light transmission angle θ in the louver film is too small, it may be difficult to see the object on the opposite side through the light transmission window. On the other hand, if the light transmission angle θ is too large, it may be difficult to adjust the amount of light incident from the light transmission window or to suppress peeping indoors from the outside. Although the suitable light transmission angle θ may vary depending on the use of the louver film, it is preferably 30 ° or more and 150 ° or less, more preferably 45 ° or more and 140 ° or less, and further preferably 60 ° or more and 120 ° or less.
The light transmission angle θ of the louver film is determined based on a cross-sectional view of the louver layer 10 taken along the YZ plane, as shown in FIG. Specifically, the cross section perpendicular to the longitudinal direction (X direction) of the light transmission band 11 and the light shielding band 12 is observed with a digital microscope or the like, and the cross sectional image is sandwiched between two light shielding bands 12. The planar shape of the single light transmission band 11 is determined, and the angle formed by the diagonal line of the planar shape is the light transmission angle θ.
　以上で説明したルーバー層１０は、例えば、以下の方法で製造することができる。まず、光透過帯１１の構成材料からなり厚さが上記Ｗ１である第１のシートの複数枚と、遮光帯１２の構成材料からなり厚さが上記Ｗ２である第２のシートの複数枚とを交互に積層し、加熱および加圧してこれら複数のシートが一体化してなるブロック体を形成する。次いで、ブロック体を構成する積層された各シートの表面に対して垂直な切断面でブロック体をスライスすることによりルーバー層１０が得られる。スライスする際の厚さ（スライス幅）は上記Ｔである。 The louver layer 10 described above can be manufactured, for example, by the following method. First, a plurality of sheets of the first sheet made of the constituent material of the light transmission band 11 and the thickness W1 and a plurality of sheets of the second sheet made of the constituent material of the light shielding band 12 and the thickness W2 Are alternately laminated, and heated and pressed to form a block body in which the plurality of sheets are integrated. Next, the louver layer 10 is obtained by slicing the block body with a cut surface perpendicular to the surface of each laminated sheet constituting the block body. The thickness (slice width) when slicing is the above T.
　ルーバー層１０の表面および裏面にそれぞれ設けられる第１の透明保護層１３および第２の透明保護層１４の材料として、例えば、光透過帯１１の材料として上記に挙げた樹脂を用いることができる。第１の透明保護層１３および第２の透明保護層１４それぞれの単体に対して、各層の厚さ方向（図中のＺ方向）に光を透過させたときの光線透過率は、７５％以上が好ましく、８５％以上がより好ましい。この光線透過率の上限値は１００％以下である。
　ルーバーフィルム１において、第１の透明保護層１３および第２の透明保護層１４のそれぞれを形成している樹脂材料、および光透過帯１１を形成している樹脂材料は、互いに同じであってもよく、それぞれ異なっていてもよい。第１の透明保護層１３および第２の透明保護層１４の材料は、透明性と耐熱性の点からポリカーボネート樹脂、ポリエステル樹脂、アクリル樹脂、ポリオレフィン系樹脂（特に、シクロオレフィンポリマー）、セルロース系樹脂が好ましく、中でもポリカーボネート、およびポリエステル樹脂がより好ましい。
　第１の透明保護層１３のＺ方向における厚さは、薄すぎると十分な保護機能が得られず、厚いほど光線透過率が低下するので、０．０１ｍｍ～０．５ｍｍ程度が好ましく、０．１ｍｍ～０．２ｍｍ程度がより好ましい。
　第２の透明保護層１４のＺ方向における厚さは、薄すぎると取り扱い性が悪く、ルーバーフィルム１の製造時の作業性に問題が生じる。また、厚いほど光線透過率が低下するので、０．０１ｍｍ～０．５ｍｍ程度が好ましく、０．１ｍｍ～０．２ｍｍ程度がより好ましい。
　第１の透明保護層１３及び第２の透明保護層１４は必須の部材ではないが、ルーバー層１０を保護する観点、意匠性を高める観点、光透過性を高める観点等から、第１の透明保護層１３及び第２の透明保護層１４のうち少なくとも一方が設けられていることが好ましく、両方が設けられていることが好ましい。 As materials for the first transparent protective layer 13 and the second transparent protective layer 14 provided on the front and back surfaces of the louver layer 10, for example, the resins listed above as the material of the light transmission band 11 can be used. The light transmittance when light is transmitted in the thickness direction of each layer (Z direction in the figure) for each of the first transparent protective layer 13 and the second transparent protective layer 14 is 75% or more. Is preferable, and 85% or more is more preferable. The upper limit of the light transmittance is 100% or less.
In the louver film 1, the resin material forming each of the first transparent protective layer 13 and the second transparent protective layer 14 and the resin material forming the light transmission band 11 may be the same as each other. Well, each may be different. The materials of the first transparent protective layer 13 and the second transparent protective layer 14 are polycarbonate resin, polyester resin, acrylic resin, polyolefin resin (especially cycloolefin polymer), and cellulose resin in terms of transparency and heat resistance. Among them, polycarbonate and polyester resin are more preferable.
If the thickness of the first transparent protective layer 13 in the Z direction is too thin, a sufficient protective function cannot be obtained, and the light transmittance decreases as the thickness increases, so that the thickness is preferably about 0.01 mm to 0.5 mm. It is more preferably about 1 mm to 0.2 mm.
If the thickness of the second transparent protective layer 14 in the Z direction is too thin, the handleability is poor, and a problem arises in workability at the time of manufacturing the louver film 1. Moreover, since the light transmittance decreases as the thickness increases, the thickness is preferably about 0.01 mm to 0.5 mm, more preferably about 0.1 mm to 0.2 mm.
Although the 1st transparent protective layer 13 and the 2nd transparent protective layer 14 are not an essential member, from a viewpoint of protecting the louver layer 10, a viewpoint which improves designability, a viewpoint which improves a light transmittance, etc., it is 1st transparent. It is preferable that at least one of the protective layer 13 and the second transparent protective layer 14 is provided, and it is preferable that both are provided.
　ルーバー層１０の表面および裏面に、第１の透明保護層１３および第２の透明保護層１４をそれぞれ設ける方法は特に限定されず、公知の手法を適宜用いることができる。
　例えば、ルーバー層１０の表面に接着剤を塗布し、第１の透明保護層１３の材料からなるシートを貼り合わせた後、接着剤を硬化させる方法でもよい。第２の透明保護層１４も同様にしてルーバー層１０の裏面に接着して一体化することができる。 The method of providing the first transparent protective layer 13 and the second transparent protective layer 14 on the front and back surfaces of the louver layer 10 is not particularly limited, and a known method can be used as appropriate.
For example, a method may be used in which an adhesive is applied to the surface of the louver layer 10, a sheet made of the material of the first transparent protective layer 13 is bonded, and then the adhesive is cured. Similarly, the second transparent protective layer 14 can be bonded and integrated on the back surface of the louver layer 10.
　前記接着剤は硬化後における光線透過率が高いものが好ましい。具体的には、硬化後の接着剤層の単体における光線透率が６５％以上であるものが好ましく、８０％以上がより好ましい。光線透過率の上限値は１００％以下である。前記接着剤としては、硬化後に透明性を有する、熱硬化型接着剤、多液反応型接着剤、紫外線硬化型接着剤等が挙げられる。具体的には、例えば、エポキシ系接着剤、ウレタン系接着剤、アクリル系接着剤、メラミン系接着剤、ポリエステル系接着剤、シリコーン系接着剤等を好適に用いることができる。
　前記接着剤の層の厚さは、例えば、０．０１μｍ～０．１ｍｍ程度とすることができる。
　以上で説明した方法によりルーバーフィルム１が得られる。 The adhesive preferably has a high light transmittance after curing. Specifically, it is preferable that the light transmittance in the simple substance of the adhesive layer after curing is 65% or more, and more preferably 80% or more. The upper limit of the light transmittance is 100% or less. Examples of the adhesive include thermosetting adhesives, multi-component reaction adhesives, and ultraviolet curable adhesives that have transparency after curing. Specifically, for example, epoxy adhesives, urethane adhesives, acrylic adhesives, melamine adhesives, polyester adhesives, silicone adhesives, and the like can be suitably used.
The thickness of the adhesive layer can be, for example, about 0.01 μm to 0.1 mm.
The louver film 1 is obtained by the method described above.
＜作用効果＞
　本実施形態のルーバーフィルム１によれば、例えば、建物の窓、自動車のフロントガラスやヘッドアップディスプレイ等の光透過窓に設置することによって、その光透過窓に入射する光のうち、光透過角度θの範囲内にある特定の入射角を有する光のみを透過させることができる。例えば、図３に示すように、ルーバーフィルム１が貼り付けられた建物２の窓ガラスを通して、屋外の視認対象物である木々３を眺めた場合、室内の観察者Ａと木々３とを結ぶベクトルの方向は、ルーバーフィルム１のルーバー層１０を構成する光透過帯１１及び遮光帯１２の厚さ方向（図２のＺ方向）に沿っている。つまり、木々３から観察者Ａに向かう光線のベクトルは、ルーバーフィルム１の光透過角度θの範囲内にある。
　このため、観察者Ａは木々３を容易に視認できる。またこの際、ルーバー層のピッチＰは３００μｍ以上とされているため、木々３のゴースト像は観察されない。一方、屋外にいる通行人Ｂと室内の観察者Ａとを結ぶベクトルの角度は、ルーバーフィルム１の光透過角度θの範囲外であるため、通行人Ｂから観察者Ａを視認することが難しくなっている。同様に、太陽Ｓとルーバーフィルム１とを結ぶベクトルの角度は、ルーバーフィルム１の光透過角度θの範囲外であるため、太陽Ｓからの直射日光が室内に射し込み難くなっている。 <Effect>
According to the louver film 1 of the present embodiment, for example, by installing it in a light transmissive window such as a building window, a windshield of a car, or a head-up display, the light transmissive angle out of the light incident on the light transmissive window. Only light having a specific incident angle within the range of θ can be transmitted. For example, as shown in FIG. 3, when the trees 3 that are objects to be viewed outdoors are viewed through the window glass of the building 2 to which the louver film 1 is attached, a vector connecting the indoor observer A and the trees 3. This direction is along the thickness direction (Z direction in FIG. 2) of the light transmission band 11 and the light shielding band 12 constituting the louver layer 10 of the louver film 1. That is, the vector of light rays from the trees 3 toward the viewer A is within the range of the light transmission angle θ of the louver film 1.
For this reason, the observer A can visually recognize the trees 3 easily. At this time, since the pitch P of the louver layer is set to 300 μm or more, a ghost image of the trees 3 is not observed. On the other hand, since the angle of the vector connecting the passerby B who is outdoors and the observer A in the room is outside the range of the light transmission angle θ of the louver film 1, it is difficult for the passerby B to visually recognize the observer A. It has become. Similarly, the angle of the vector connecting the sun S and the louver film 1 is outside the range of the light transmission angle θ of the louver film 1, so that direct sunlight from the sun S is difficult to enter the room.
＜変形例１＞
　上記実施形態の変形例として、図示していないが、第１の透明保護層１３の反対側の最外層として粘着層を設けてもよい。例えば、第２の透明保護層１４を設けず、ルーバー層１０の裏面の全体に粘着層を設けることができる。また、第２の透明保護層１４の上に粘着層を積層した構成も例示できる。
　前記粘着層の材料としては、透明性が高いものが好ましく、窓ガラス等の窓基材に対して剥離可能な程度の粘着力を有するものであってもよいし、剥離不可能な程度に接着するものであってもよい。このような粘着層を形成可能な粘着剤として、市販品が適用され、例えば、アクリル系粘着剤、ウレタン系粘着剤、ゴム系粘着剤等が挙げられる。前記ゴム系粘着剤の具体例としては、シリコーンゴム、シリコーンゲル、ウレタンゴム、ウレタンゲル等が挙げられる。これらの中でも、剥離した後の糊残りが少なく、透明性が高い点でシリコーンゴムが特に好ましい。形成された粘着層には、鏡面加工が施されてもよい。
　上記の変形例によれば、ルーバーフィルムを窓基材の表面に貼り付けることができるので、ルーバーフィルムと窓基材との間に空気層が介在している構成に比べて、透過光の損失が小さくなる。 <Modification 1>
As a modification of the above embodiment, although not shown, an adhesive layer may be provided as the outermost layer on the opposite side of the first transparent protective layer 13. For example, an adhesive layer can be provided on the entire back surface of the louver layer 10 without providing the second transparent protective layer 14. Moreover, the structure which laminated | stacked the adhesion layer on the 2nd transparent protective layer 14 can also be illustrated.
As the material of the pressure-sensitive adhesive layer, a material having high transparency is preferable, and may have a pressure-sensitive adhesive strength that can be peeled off from a window substrate such as a window glass. You may do. A commercial item is applied as an adhesive which can form such an adhesion layer, for example, an acrylic adhesive, a urethane adhesive, a rubber adhesive, etc. are mentioned. Specific examples of the rubber-based pressure-sensitive adhesive include silicone rubber, silicone gel, urethane rubber, and urethane gel. Among these, silicone rubber is particularly preferable from the viewpoint of little adhesive residue after peeling and high transparency. The formed adhesive layer may be mirror-finished.
According to the above-described modification, since the louver film can be attached to the surface of the window base material, compared to the configuration in which an air layer is interposed between the louver film and the window base material, the loss of transmitted light Becomes smaller.
＜変形例２＞
　上記実施形態では、図２の断面（Ｙ－Ｚ断面）における遮光帯１２の向き（前記断面における遮光帯１２の長辺の長手方向）は、ルーバーフィルム１の厚さ方向（Ｚ方向）と平行であるが、遮光帯１２の向きがＺ方向に対して傾いていてもよい。例えば図４に示すように、建物２の２階の窓ガラスに設置されたルーバーフィルム１の遮光帯１２の前記向きは、室内の観察者Ａが地上を見下ろす方向に沿っており、遮光帯１２の前記向きをＺ方向（窓ガラスの厚み方向）に対して傾けた構成が挙げられる。この構成によれば、室内の観察者Ａが地上の視認対象物３を観察することが容易であるとともに、観察者Ａが見上げる方向にある太陽Ｓからの直射日光の射し込みを抑制することができる。 <Modification 2>
In the above embodiment, the direction of the light shielding band 12 (longitudinal direction of the long side of the light shielding band 12 in the cross section) in the cross section (YZ cross section) in FIG. 2 is parallel to the thickness direction (Z direction) of the louver film 1. However, the direction of the light shielding band 12 may be inclined with respect to the Z direction. For example, as shown in FIG. 4, the direction of the light shielding band 12 of the louver film 1 installed on the window glass on the second floor of the building 2 is along the direction in which the indoor observer A looks down on the ground. The configuration in which the direction of is tilted with respect to the Z direction (the thickness direction of the window glass) is mentioned. According to this configuration, it is easy for the observer A in the room to observe the visual object 3 on the ground, and direct sunlight from the sun S in the direction in which the observer A looks up can be suppressed. .
［実施例１］
　図１，２に示す構成のルーバーフィルム１を製造した。
　まず、光透過帯１１として透明シリコーンゴム（信越化学工業社製、商品名；ＫＥ１５３Ｕ）からなる厚さが４８０μｍの第１のシートを用意した。
　これとは別に、遮光帯１２として透明シリコーンゴム（信越化学工業社製、商品名；ＫＥ１５３Ｕ）にカーボンブラックを添加した黒色材料からなる厚さが２０μｍの第２のシートを用意した。
　次に、第１のシート複数枚と第２のシート複数枚とを交互に積層した後、加熱加硫および加圧してこれら複数のシートが一体化してなるブロック体を形成した。このブロック体をシート表面に垂直な切断面で、厚さ７４０μｍにスライスすることによりルーバー層１０を作製した。
　続いて、得られたルーバー層１０の両面に熱硬化型接着剤（信越化学工業社製、商品名；ＫＥ１８２５）を塗布した厚さ１００μｍのポリカーボネートシート（第１および第２の透明保護層１３，１４）を貼り合わせ熱硬化させることにより、ルーバーフィルム１を作製した。 [Example 1]
A louver film 1 having the structure shown in FIGS.
First, a first sheet having a thickness of 480 μm made of transparent silicone rubber (trade name: KE153U, manufactured by Shin-Etsu Chemical Co., Ltd.) was prepared as the light transmission band 11.
Separately, a second sheet having a thickness of 20 μm made of a black material obtained by adding carbon black to transparent silicone rubber (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KE153U) was prepared as the light shielding band 12.
Next, after laminating a plurality of first sheets and a plurality of second sheets alternately, heat vulcanization and pressurization were performed to form a block body in which these sheets were integrated. The louver layer 10 was produced by slicing the block body to a thickness of 740 μm with a cut surface perpendicular to the sheet surface.
Subsequently, a polycarbonate sheet (first and second transparent protective layers 13, 100 μm) obtained by applying a thermosetting adhesive (trade name: KE1825, manufactured by Shin-Etsu Chemical Co., Ltd.) to both surfaces of the obtained louver layer 10. The louver film 1 was produced by bonding and thermosetting 14).
　本実施例で作製したルーバーフィルム１において、遮光帯１２のピッチＰは５００μｍ、遮光帯１２の幅が２０μｍ、ルーバー層１０の厚さが７４０μｍである。
　本実施例のルーバーフィルム１ついて、測定角度を変化させながら、すなわち図１，２のＹ－Ｚ平面内においてＺ方向と光源から受光器への光軸とのなす角度を変化させながら、光線透過率を測定した。その結果、本実施例のルーバーフィルム１の光透過角度θは１００°であり、Ｚ方向における光線透過率は８０％であった。光透過角度θを超えた角度から入射した光の光線透過率は、５％未満であった。 In the louver film 1 produced in this example, the pitch P of the light shielding band 12 is 500 μm, the width of the light shielding band 12 is 20 μm, and the thickness of the louver layer 10 is 740 μm.
With respect to the louver film 1 of this embodiment, while changing the measurement angle, that is, changing the angle between the Z direction and the optical axis from the light source to the light receiver in the YZ plane of FIGS. The rate was measured. As a result, the light transmission angle θ of the louver film 1 of this example was 100 °, and the light transmittance in the Z direction was 80%. The light transmittance of light incident from an angle exceeding the light transmission angle θ was less than 5%.
　本実施例のルーバーフィルム１を手に持ち、腕を伸ばした状態で視線の方向へかざして、ルーバーフィルム１を通して以下の視認対象物を観察した。
　視認対象物として、屋外のビル群、屋外の信号、天井の蛍光灯、ＰＣの液晶画面に表示された水平方向の赤線をそれぞれ見たところ、ゴースト像は見られず、良好に視認することができた。観察の際、光透過角度θを超える範囲の光の透過率は低く、ブラインドとしての機能が充分に発揮されることを確認できた。 Holding the louver film 1 of this example in the hand and holding the louver film in the direction of the line of sight with the arms extended, the following visual objects were observed through the louver film 1.
When viewing the horizontal red lines displayed on the outdoor buildings, outdoor signals, ceiling fluorescent lights, and PC liquid crystal screens as sighted objects, the ghost image is not seen and the sight is well visible. I was able to. At the time of observation, the light transmittance in the range exceeding the light transmission angle θ was low, and it was confirmed that the function as a blind was sufficiently exhibited.
［比較例１］
　実施例１における第１のシートの厚さを１３０μｍに変更してルーバー層を形成した以外は、実施例１と同様にルーバーフィルムを作製した。この比較例のルーバーフィルムにおいて、遮光帯１２のピッチＰは１５０μｍ、遮光帯の幅が２０μｍ、ルーバー層の厚さが２００μｍである。このルーバーフィルムの光透過角度θは約１００°であった。
　比較例のルーバーフィルムを用いて、実施例１と同様の観察実験を行ったところ、屋外のビル群の輪郭、屋外の信号、天井の蛍光灯、ＰＣの液晶画面に表示された水平方向の赤線のいずれについても、２重又は３重にぼやけて見えるゴースト像が発生した。 [Comparative Example 1]
A louver film was produced in the same manner as in Example 1 except that the thickness of the first sheet in Example 1 was changed to 130 μm to form a louver layer. In the louver film of this comparative example, the pitch P of the light shielding band 12 is 150 μm, the width of the light shielding band is 20 μm, and the thickness of the louver layer is 200 μm. The light transmission angle θ of this louver film was about 100 °.
The same observation experiment as in Example 1 was performed using the louver film of the comparative example. The outline of the outdoor building group, the outdoor signal, the fluorescent lamp on the ceiling, and the horizontal red displayed on the liquid crystal screen of the PC. For both lines, a ghost image that appears double or triple blurred was generated.
　本発明のルーバーフィルムは、建物の窓、自動車のフロントガラスやヘッドアップディスプレイ等に広く利用可能である。 The louver film of the present invention can be widely used for building windows, automobile windshields, head-up displays, and the like.
　１　ルーバーフィルム
　１０　ルーバー層
　１１　光透過帯
　１２　遮光帯 1 louver film 10 louver layer 11 light transmission band 12 light shielding band

Claims (3)

  1. 　光透過帯と遮光帯とが交互に配されているルーバー層を備えたルーバーフィルムであって、前記遮光帯のピッチが３００μｍ以上１１００μｍ以下であることを特徴とするルーバーフィルム。 A louver film comprising a louver layer in which light transmission bands and light shielding bands are alternately arranged, wherein the pitch of the light shielding bands is 300 μm or more and 1100 μm or less.
  2. 　｛前記光透過帯の幅／（前記光透過帯の幅＋前記遮光帯の幅）｝×１００％で表される開口率が９０％以上９９．９％以下であることを特徴とする請求項１記載のルーバーフィルム。 The aperture ratio represented by {width of the light transmission band / (width of the light transmission band + width of the light shielding band)} × 100% is 90% or more and 99.9% or less. 1. The louver film according to 1.
  3. 　前記ルーバー層の厚さが３５０μｍ以上３０００μｍ以下であることを特徴とする請求項１又は２に記載のルーバーフィルム。 The louver film according to claim 1 or 2, wherein the louver layer has a thickness of 350 µm or more and 3000 µm or less.
PCT/JP2017/042800 2016-11-29 2017-11-29 Louver film WO2018101325A1 (en)

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