JP2011094469A - Light control louver sheet, light control body, and light control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light control louver sheet lightweight, easily miniaturizable, provided at low cost and capable of easily and delicately adjusting the amount of light transmission. <P>SOLUTION: The light control louver sheet 2 includes a light transmitting sheet body 5 made of a viscoelastic body, and a plurality of light shielding members 6 provided in the sheet body 5 and extending in a direction of intersecting a light incident surface 5a. The plurality of light shielding members 6 are arranged so that incident light from the light incident surface is emitted from a partial region of a light emission surface. When shearing force is applied to cause the light incident surface 5a and the light emission surface 5b to deviate in a plane direction, the extending direction of the light shielding members 6 changes so that at least a part of light that has reached the light emission surface 5b before the shearing force is applied out of the incident light from the light incident surface 5a does not reach the light emission surface 5b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a dimming louver sheet for dimming various spaces such as a room where a light enters from the outside or inside a vehicle, and more specifically, a plurality of light shielding members are provided inside a translucent sheet. The present invention relates to a light control louver sheet, a light control body and a light control method using the light control louver sheet.

  In order to suppress the temperature rise due to sunlight entering the room through the window glass, a light shielding method using a blind is widely used. In the blind, a large number of strip-shaped thin plates made of metal or resin are arranged in parallel, and the numerous strip-shaped thin plates are connected by strings. Dimming is performed by pulling the string or by changing the angle of the thin plate using an electric drive device.

  On the other hand, the following Patent Document 1 discloses a liquid crystal light control sheet using alignment of liquid crystal molecules. In the liquid crystal light control sheet, liquid crystal is sealed between two transparent substrates. When no voltage is applied to the liquid crystal, the arrangement of liquid crystal molecules becomes random, scatters light, and is in a light shielding state. By applying a voltage, liquid crystal molecules are aligned and light is transmitted. Therefore, the light blocking state and the light transmitting state can be instantaneously switched.

JP-A-6-248251

  In the light control method using a blind, the surroundings of the window glass become complicated, and the appearance is impaired. Moreover, in the blind operated by the string, the string is entangled, and there is a case where the light control cannot be performed without fail without fail.

  On the other hand, in the liquid crystal light control sheet, there is a problem that the liquid crystal must be sealed between the transparent substrates and the transparent electrode layer must be provided on the transparent substrate, which is expensive. In particular, when it is used for dimming a large window glass or the like, the cost is very high and it is difficult to use it for a large window or the like. In addition, although the light blocking state and the light transmitting state can be switched instantaneously, it is difficult to finely adjust the amount of transmitted light. In addition, a device for applying a voltage or the like is required around the liquid crystal light control sheet, and there are restrictions on the place to use.

  An object of the present invention is to eliminate the disadvantages of the prior art described above, to provide a light control louver sheet that is small, can be provided at low cost, and can perform light control quickly and reliably. The object is to provide a light control body and a light control method using the light control louver sheet.

  The light control louver sheet according to the present invention is formed of a viscoelastic body, and has a light incident surface and a light transmitting surface opposite to the light incident surface, and is provided in the sheet main body. And a plurality of light shielding members extending in a direction crossing the light incident surface. In this light control louver sheet, a plurality of light shielding members are arranged in the surface direction of the light incident surface, and when a shearing force is applied so that the light incident surface and the light output surface are displaced in the surface direction. In addition, the extending direction of the light shielding member changes so as to reduce the amount of light reaching the light emitting surface.

  In a specific aspect of the light control louver sheet according to the present invention, an aspect is a ratio of a length extending in a direction intersecting the light incident surface of the light shielding member and a width being a dimension in a direction perpendicular to the length. The ratio is in the range of 1-20. In this case, since the length of the light shielding member is equal to or greater than the width, when the shearing force is applied and the extending direction of the light shielding member is inclined, the amount of light reaching the light emitting surface can be reduced more effectively. .

  In another specific aspect of the light control louver sheet according to the present invention, a pitch at which the plurality of light shielding members are arranged is equal to or greater than a width of the light shielding member. In this case, since the pitch between the plurality of light shielding members is relatively large, it is possible to sufficiently increase the amount of light reaching the light emitting surface without applying a shearing force. Therefore, not only can the light control range be expanded, but also the brightness of light and the like in a state where no shear force is applied can be increased.

  In still another specific aspect of the light control louver sheet according to the present invention, a direction in which the light shielding member extends is a direction orthogonal to the light incident surface. In this case, it is possible to further increase the amount of light transmitted without applying a shearing force.

  In still another specific aspect of the light control louver sheet according to the present invention, the light shielding member is a heat shielding light shielding member that shields heat rays. In this case, not only dimming can be performed, but also the heat shielding property can be controlled.

  In another specific aspect of the light control louver sheet according to the present invention, the heat-shielding light-shielding member comprises a light-shielding viscoelastic body, and the light-shielding viscoelastic body has a light-shielding oxide particle having a heat ray shielding function. And / or an organic dye having a heat ray shielding function. In this case, since the light-shielding oxide particles and the organic dye having a light-shielding shielding function are used, the heat rays can be shielded more reliably, and the temperature rise in the room can be more reliably suppressed. .

In still another specific aspect of the light control louver sheet according to the present invention, the sheet main body has a storage elastic modulus G ′ at −20 ° C. to 50 ° C. of 1.0 × 10 ⁵ dyn / cm ² or less. Consists of.

  The light control body which concerns on this invention is equipped with the louver sheet for light control of this invention, and the translucent board | substrate laminated | stacked on both surfaces of the louver sheet for light control. In this case, it is possible to easily apply a shearing force to the light control louver sheet only by shifting at least one of the translucent substrates laminated on both surfaces in the surface direction.

  The light control method according to the present invention applies a shearing force to the light control louver sheet so as to shift the light incident surface and the light output surface of the light control louver sheet of the present invention in the plane direction, and adjusts the shear force. By doing so, dimming is performed. A room or the like can be easily adjusted to a desired brightness only by adjusting the magnitude of the applied shear force.

  According to the light control louver sheet according to the present invention, since the plurality of light shielding members are provided in the translucent sheet main body made of a viscoelastic body, in the light control louver sheet, By applying a shearing force so that the light exit surface deviates in the surface direction, the extending direction of the light shielding member is changed, whereby the amount of light reaching the light exit surface from the light incident surface can be adjusted. Therefore, dimming can be easily performed only by applying the shearing force. In addition, since the light-shielding member is provided in the translucent sheet body, it is easy to reduce the size and thickness as compared with blinds and liquid crystal light control sheets, and to provide them at a low cost. it can. In addition, it can be easily applied to various window glasses and places where dimming is necessary.

(A) is front sectional drawing which shows the light control body which has the louver sheet for light control of the 1st Embodiment of this invention, (b) is front sectional drawing of this light control body in the light-shielding state. . (A), (b) is the perspective view and front sectional drawing for demonstrating the modification of the light control louver sheet | seat used in the 2nd Embodiment of this invention, (c), (d) ) Is a perspective view and a front sectional view for explaining a modification of the light control louver sheet used in the third embodiment of the present invention, and (e) and (f) of FIG. It is the perspective view and front sectional drawing for demonstrating the modification of the light control louver sheet | seat used in 4th Embodiment. (A) is front sectional drawing which shows the modification of the light modulation body of 1st Embodiment, (b) is front sectional drawing which shows the light modulation body which concerns on another modification, (c) is further It is front sectional drawing of this invention which shows the light control body of another modification. It is a perspective view which shows the louver sheet | seat for light control which concerns on the 2nd Embodiment of this invention. It is the perspective view and top view for demonstrating the metal mold | die used for obtaining the light control louver sheet | seat of the 1st Embodiment of this invention. It is a partial notch front sectional drawing which shows the lighting heat insulation apparatus provided with the light control louver sheet | seat as the 4th Embodiment of this invention. (A) is a schematic block diagram for demonstrating the apparatus for demonstrating the apparatus for manufacturing the lighting insulation material used for the lighting insulation apparatus shown in FIG. 6, (b) is a resin-made spacer. It is a top view which shows the state which formed in the translucent sheet | seat.

  Hereinafter, the present invention will be clarified by describing specific embodiments of the present invention with reference to the drawings.

  Fig.1 (a) is front sectional drawing which shows the light control body of the 1st Embodiment of this invention. The light control body 1 of this embodiment has the light control louver sheet | seat 2 as embodiment of this invention, and the translucent board | substrates 3 and 4 laminated | stacked on both sides of the light control louver sheet | seat 2. FIG.

  The light control louver sheet 2 includes a translucent sheet main body 5 and a plurality of light shielding members 6 provided in the sheet main body 5. The sheet body 5 includes a light incident surface 5a and a light emitting surface 5b facing the light incident surface 5a. Although not essential, the light incident surface 5a and the light emitting surface 5b are parallel to each other.

The sheet body 5 is preferably made of a viscoelastic body having a storage elastic modulus G ′ at −20 ° C. to 50 ° C. of 1.0 × 10 ⁵ dyn / cm ² or less. The viscoelastic body having such a specific storage elastic modulus G ′ is not particularly limited. Such a viscoelastic body can be composed of an appropriate viscoelastic resin having a total light transmittance of 80% or more, for example. The viscoelastic resin can be composed of an appropriate type of resin such as a thermoplastic resin, a thermosetting resin, a photocurable resin, or a moisture curable resin. However, the viscoelastic body needs to be light transmissive, and it is preferable to use a resin having a total light transmittance of 80% or more. When the total light transmittance is 80% or more, it is possible to increase the amount of light emitted from the light emitting surface 5b in a light transmitting state described later. Therefore, the light control range can be expanded and the interior of the room can be sufficiently brightened in the light transmission state.

  Specific examples of the viscoelastic resin include acrylic resin, silicone resin, urethane resin, EVA resin, butyral resin, and the like. An ultraviolet absorber, an antioxidant, a plasticizer, or the like may be added to the viscoelastic resin as necessary.

The storage elastic modulus G ′ at −20 ° C. to 50 ° C. of the viscoelastic body is preferably 1.0 × 10 ⁵ dyn / cm ² or less. Since it is 1.0 × 10 ⁵ dyn / cm ² or less, as described later, it can be easily deformed by applying a shearing force, and light control can be reliably performed. When the storage elastic modulus is larger than the specific range, the light control louver sheet 2 is hardly deformed, and light control cannot be performed reliably. More preferably, the storage elastic modulus G is in the range of 5.0 × 10 ⁴ dyn / cm ^{2 to} 1.0 × 10 ³ dyn / cm ² , and in that case, the storage elastic modulus G is more easily deformed by a shearing force, Dimming can be performed more reliably and promptly. When it is smaller than the range of 1.0 × 10 ³ dyn / cm ² , the strength of the sheet is lowered and the handling property is deteriorated.

  The light shielding member 6 is provided in the sheet body 5. In the present embodiment, the light shielding member 6 has one end exposed at the light incident surface 5a and extends toward the light emitting surface 5b. The extending direction of the light shielding member 6 is a direction intersecting with the light incident surface 5a, but in the present embodiment, it is an orthogonal direction. Preferably, as in the present embodiment, it is desirable that the extending direction of the light shielding member 6 is a direction orthogonal to the light incident surface 5a, thereby reducing the amount of light emitted from the light emitting surface 5b in the light transmitting state. It can be increased enough. Therefore, the dimming range can be expanded.

  In addition, although the some light shielding member 6 is provided in the sheet | seat main body 5, a part of light shielding member 6 may be exposed to the surface of the sheet | seat main body 5 like this embodiment.

  In the cross section shown in FIG. 1A, that is, the cross section along the direction connecting the light incident surface 5a and the light emitting surface 5b of the sheet body 5, the light shielding member 6 has an elongated rectangular strip shape. When the extending direction, that is, the length of the light shielding member 6 is L and the dimension in the direction orthogonal to the length is the width W, the aspect ratio L / W, which is the ratio of the length to the width, may be in the range of 1-20. desirable. When the aspect ratio is less than 1, it is difficult to sufficiently widen the light blocking region by the light blocking member 6 when the light blocking state is set as will be described later. On the other hand, when the aspect ratio exceeds 20, the viewing angle through the louver sheet in a state where light control is not performed becomes narrow.

  In the present embodiment, the plurality of light shielding members 6 are arranged at an equal pitch in the surface direction of the light incident surface 5a, but are not necessarily arranged at an equal pitch. However, it is preferable that the interval between the adjacent light shielding members 6 is wider than the width W of the light shielding members 6. Thereby, the light transmission amount in the light transmission state can be sufficiently increased, and a wide viewing angle can be obtained. More preferably, it is 4 times or more than the width W. The upper limit of the ratio of the interval between the adjacent light shielding members 6 with respect to the width W is not particularly limited. However, if the interval is too wide, it is difficult to reliably shield the adjacent light shielding members 6 from each other. Therefore, it is desirable that it is 20 times or less.

  The width W of the light shielding member 6 is preferably 50 μm or less. When the width of the light shielding member 6 is larger than 50 μm, the light shielding member 6 is easily noticeable when transmitting light when viewed with human eyes.

  The light shielding member 6 can be formed of an appropriate material as long as the total light transmittance is lower than the total light transmittance of the material constituting the sheet body 5. It is preferable to use a material that can completely block light. As such a material, a metal foil or a carbonaceous material can be used. The light shielding member 6 may be formed of a material obtained by kneading a resin such as a black pigment in a resin.

  Preferably, since the length direction of the light shielding member 6 changes with the deformation of the sheet body 5 as described later, it is preferable that the light shielding member 6 can easily follow the deformation of the sheet body 5. Therefore, the light shielding member 6 is preferably an elastic body or a viscoelastic body. Examples of such an elastic body include silicon rubber, acrylic rubber, and urethane rubber. As the viscoelastic body, the same resin as the viscoelastic resin constituting the sheet body 5 is used. it can. What is necessary is just to provide light-shielding property by knead | mixing the black pigment etc. which were mentioned above to these resin.

  The light to be adjusted by the light control louver sheet in the present invention is not limited to visible light, but also includes infrared rays such as far infrared rays and far infrared rays. Accordingly, the light shielding member 6 may be a heat shielding light shielding member that selectively transmits infrared light or far infrared light while transmitting visible light. When a heat-shielding light-shielding layer that transmits visible light and blocks infrared rays is used, visible light is transmitted. Indoor temperature rise can be prevented without loss.

  As described above, the heat-shielding light-shielding material that transmits visible light and shields infrared rays is not particularly limited. For example, oxide fine particles and / or organic dye compounds known as heat-shielding materials for viscoelastic bodies Can be used.

  Although it does not specifically limit as said oxide fine particle, Tin dope indium oxide, antimony dope tin oxide, aluminum dope zinc oxide, tin dope zinc oxide, silicon dope zinc oxide etc. can be used. A plurality of these oxide fine particles may be used in combination.

  The organic dye compound having a heat shielding property is not particularly limited, but is a diimonium dye, an aminium dye, a phthalocyanine dye, an anthraquinone dye, a polymethine dye, a benzenedithiol ammonium compound, a thiourea derivative, and a thiol metal complex. And so on.

  The blending amount of the oxide fine particles may be appropriately selected as long as the visible light transmittance does not decrease so much when the light control louver sheet 2 is deformed and has an effect of shielding infrared rays. Preferably, the oxide fine particles are 0.5 to 100 parts by weight, more preferably 1.0 to 70 parts by weight with respect to 100 parts by weight of the viscoelastic body. If the amount is less than 0.5 parts by weight, the heat shielding effect may not be sufficient, and if it exceeds 100 parts by weight, the visible light transmittance may be reduced.

  The translucent substrates 3 and 4 can be formed of an appropriate material as long as they are light transmissive. Preferably, since it has a certain degree of rigidity and it is easy to apply a shearing force as described later, a glass plate or a transparent ceramic plate can be suitably used. Alternatively, a resin substrate having light transparency may be used. Examples of the resin for the resin substrate include phosphazene resin, polymethyl methacrylate resin, polycyclohexyl methacrylate resin, polycarbonate resin, polysulfone resin, polyether sulfone resin, polystyrene resin, styrene / methyl methacrylate copolymer, styrene / acrylonitrile copolymer. Polymer, styrene / maleimide copolymer, polycyclohexylmethacrylate resin, poly-4-methylpentene-1 resin, polyvinyl chloride resin, diethylene glycol bisallyl carbonate resin, polyethylene terephthalate resin, polyethylene naphthalate resin, polycyclohexanedimethanol terephthalate resin , Transparent ABS (acrylonitrile / butadiene / styrene copolymer) resin, ethylene norbornene copolymer, and Japan On Corp. ZONOR (registered trademark) and ZEONEX (registered trademark) to be able to use a resin substrate such as cycloolefin-based polymer represented.

  When laminating the light-transmitting substrates 3 and 4 on the light control louver sheet 2, the light-transmitting substrates 3 and 4 may be bonded to the light control louver sheet 2 using a transparent adhesive, or When the viscoelastic resin which comprises the light control louver sheet 2 has adhesiveness, the translucent board | substrates 3 and 4 may be bonded together using the adhesiveness.

  Moreover, as long as the translucent board | substrates 3 and 4 are laminated | stacked on the light control louver sheet 2, it does not necessarily need to be joined by adhesion or adhesion | attachment. You may maintain the structure which laminated | stacked the said louver sheet | seat 2 for light control and the translucent board | substrates 3 and 4 so that a lamination | stacking state may be maintained by a mechanical clamp etc. However, in that case, it is necessary to apply a shearing force described later to the light control louver sheet 2 itself. Therefore, it is preferable that the translucent substrates 3 and 4 are bonded to the light control louver sheet 2.

  The method for manufacturing the light control louver sheet 2 is not particularly limited. For example, the mold 11 shown in FIGS. 5A and 5B is used, the resin constituting the sheet body 5 is poured, and the light shielding member 6 exists. For example, a method may be used in which the sheet body 5 having a concave portion corresponding to the shape of the light shielding member 6 is formed in the portion, and then the concave portion is filled with the light shielding member. In the mold 11 shown in FIG. 5A, a plurality of thin plate-like convex portions 13 having a shape obtained by inverting the shape of the light shielding member 6 are arranged on the upper surface of a flat plate-shaped mold body 12 at a predetermined interval. .

  In addition, the method of manufacturing the light control louver sheet 2 is not limited to the method using the mold 11, but a mold roll having a convex portion obtained by inverting the concave portion corresponding to the portion where the light shielding member 6 is formed on the outer surface. It may be used. What is necessary is just to form the said recessed part by the method etc. which are contacted with the type | mold roll by melt-extruded resin, and filling the material which comprises the light-shielding member 6 next to a recessed part. Further, the sheet body 5 may be formed using a photolithography technique without using the mold 11.

  Next, the usage method of the light control body 1 of this embodiment is demonstrated.

  In the initial state, no external force is applied to the dimmer 1. Accordingly, in the initial state shown in FIG. 1A, that is, in the light transmission state, the light shielding member 6 extends in a direction orthogonal to the light incident surface 5a.

  When light shielding is desired, a shearing force is applied in the direction indicated by arrow A in FIG. In applying this shearing force to the light control louver sheet 2, an external force is applied to at least one of the translucent substrate 3 and the translucent substrate 4 so as to shift the translucent substrate 3 and the translucent substrate 4 in the plane direction. Can be used.

  As a result, as shown in FIG. 1B, the translucent substrate 3 and the translucent substrate 4 are displaced in the surface direction, and the viscoelastic sheet body 5 is deformed. With this deformation, the light shielding member 6 is inclined from the direction connecting the light incident surface 5a and the light emitting surface 5b. Therefore, as indicated by an arrow B in FIG. 1B, the light incident from the front direction to the dimming louver sheet 2 from the light incident surface 5a hits the light shielding member 6 and reaches the light emitting surface 5b. It will not be. Accordingly, in FIG. 1B, since light does not reach the light emitting surface 5b in the region shielded by the light shielding member 6, the amount of light emitted from the light emitting surface 5b can be reduced. . More preferably, as shown in FIG. 1 (b), the light shielding member 6 adjacent to the nearest part of the proximal end 6b of the light shielding member 6 adjacent to the light shielding member 6 is inclined. It is desirable to be deformed so as to be located on the member 6 side. In that case, the light blocking property of light incident from the front direction is greatly improved.

  As described above, when the light control body 1 according to the present embodiment is used, the shearing force is applied and the light can not be transmitted. However, in the light control body 1, the magnitude of the shearing force is set. By adjusting, the inclination of the light shielding member 6 can be adjusted. For example, when the light shielding member 6 is gently tilted, a region through which light incident from the front direction is transmitted remains outside the light shielding member, so that the light can be dimmed so as not to be shielded. Therefore, the amount of light transmission can be adjusted by adjusting the magnitude of the shearing force. Therefore, in the light adjuster 1, not only can the light transmission state and the light shielding state be switched, but also the amount of light emitted from the light emitting surface 5b can be adjusted delicately and with high accuracy. In addition, when adjusting, it is only necessary to adjust the magnitude of the shearing force.

  The method for applying a shearing force in the direction of arrow A is not particularly limited. For example, a method of connecting a piston of an air cylinder to translucent substrate 3 and moving translucent substrate 3 in the direction of arrow A by the air cylinder. Is mentioned. In addition to the method using an air cylinder, an appropriate reciprocating drive source capable of relatively moving the translucent substrate 3 and the translucent substrate 4 in the surface direction can be used. In addition, a heat-sensitive material that is deformed by heat is directly or indirectly connected to the light-transmitting substrate 3 or the light-transmitting substrate 4 to change the temperature, thereby causing the light-transmitting substrate 3 or the light-transmitting substrate 4 to move in the surface direction. It may be moved.

  Further, when the light shielding member 6 is a heat-shielding light-transmitting member as in the modification described above, the space on the side from which light is emitted from the light emitting surface 5b by applying the shearing force as described above. The amount of incident infrared rays can be adjusted, and thereby the temperature in the room can be adjusted. In particular, the heat-shielding light-shielding member 6 transmits visible light, but when the infrared light is selectively shielded, it is possible to suppress only a decrease in temperature without reducing indoor brightness.

  In the light control body of the first embodiment, the light shielding member 6 has one end exposed at the light incident surface 5a of the sheet body 5 and does not reach the light emitting surface 5b. And like the louver sheet 21 for light control as 2nd Embodiment shown to (b), even if the light shielding member 6 is provided so that it may penetrate from the light-incidence surface 5a of the sheet | seat main body 5 to the light-projection surface 5b. Good.

  Further, like the light control louver sheet 22 as the third embodiment shown in FIGS. 2C and 2D, the light blocking member 6 reaches the light incident surface 5 a and the light emitting surface 5 b of the sheet body 5. It may be provided so that there is no.

  Moreover, like the light control louver sheet 23 as the fourth embodiment shown in FIGS. 2 (e) and 2 (f), an adhesive layer or an external layer is provided outside the light incident surface 5a and the light emitting surface 5b of the sheet body 5. An adhesive layer 42 may be provided.

  Moreover, in the light control body as 3rd Embodiment shown to Fig.3 (a), the translucent board | substrate 3 is provided only in one surface of the light control louver sheet 2, and the translucent property is provided in the other surface. No substrate is provided. As described above, the translucent substrate may be provided only on one surface of the light control louver sheet 2. Preferably, when the translucent substrate 3 is provided only on one surface as in the present embodiment, it is desirable to provide the translucent substrate 3 only on the light incident surface 5a side. Thereby, when used for a window glass or the like exposed to the outside air, it is possible to prevent the light control louver sheet 2 from being contaminated on the light incident surface 5a side as the outer surface.

  The light control body 31 of the modification shown in FIG.3 (b) is provided with the translucent board | substrates 3 and 4 on both surfaces of the light control louver sheet | seat 21 shown to FIG. 2 (a), (b). It is. Thus, even when the light control louver sheet 21 of the second embodiment is used, the light control body similar to that of the first embodiment can be obtained by laminating the translucent substrates 3 and 4 on both surfaces. Can be configured.

  The light control body 41 of the modification shown in FIG.3 (c) is provided with the translucent board | substrates 3 and 4 on both surfaces of the light control louver sheet | seat 23 shown in FIG.2 (e), (f). It is. As described above, even when the light control louver sheet 23 of the fourth embodiment is used, the light control body similar to that of the first embodiment can be obtained by laminating the translucent substrates 3 and 4 on both surfaces. Can be configured.

  As shown in FIGS. 3A to 3C, in the present invention, the dimmer is appropriately deformed as long as it has a structure in which a translucent substrate is laminated on the dimming louver sheet according to the present invention. Can do.

  FIG. 4 is a perspective view showing still another modification of the light control louver sheet of the present invention.

  In the light control louver sheet 51 of this modification, a plurality of light shielding members 6 are provided in a light transmitting sheet body 52. Here, unlike the first embodiment, the plurality of light shielding members 6 are arranged in a plurality of rows when the light shielding surfaces 6 of the translucent sheet main body 52 are viewed from the light incident surface 52a side. Has been. In this way, a plurality of aligned light shielding members 6 may be provided in a plurality of rows.

  The above-mentioned light control louver and light control body can be suitably used for indoor light control, heat insulation, etc., for example, by being attached to a window glass inside a building or as an alternative to a window glass. However, it can be used for dimming various spaces such as vehicles and airplanes as well as the interior of buildings.

  As an example, a daylighting heat insulating apparatus provided with the light control louver of the present invention will be described with reference to FIG. The daylighting and heat insulating device 61 has a structure in which the light control louver 2 according to the first embodiment of the present invention and a daylighting heat insulating material 62 described later are laminated.

  More specifically, the dimming louver 2 is laminated on the inner surface of the first glass plate 63. A second glass plate 64 is laminated on the surface of the light control louver 2 opposite to the side on which the first glass plate 63 is laminated. A daylighting heat insulating material 62 is laminated on the second glass plate 64 via an air layer 65. A third glass plate 67 is laminated on the surface of the daylighting heat insulating material 62 opposite to the air layer 65 via the air layer 66. In addition, the 1st laminated part which consists of the 1st glass plate 63, the light control louver 2, and the 2nd glass plate 64, the daylighting heat insulating material 62, and the 3rd glass plate 67 are the said air layers 65, 66 are stacked and fixed at a portion not shown. Thereby, air layers 65 and 66 are formed. This fixing structure is not particularly limited. For example, the fixing structure can be realized by using an appropriate fixing member for joinery such as a frame of a glass window.

  By the way, the daylighting heat insulating material 62 includes a plurality of rectangular translucent sheets 62a. The translucent sheet 62a is a sheet made of a translucent resin. But you may be formed with translucent materials other than resin. The plurality of translucent sheets 62a are stacked via a plurality of linear resin spacers 62b arranged in parallel to each other. For this reason, an air layer 62c is formed between the adjacent translucent sheets 62a. Therefore, a high heat insulating effect can be obtained.

  The plurality of translucent sheets 62a may be formed of the same material or may be formed of different materials.

  Moreover, the 1st glass plate 63, the 2nd glass plate 64, and the 3rd glass plate 67 may be formed with not only glass but transparent resin.

  In the daylighting heat insulating device 61, a dimming action can be obtained by the dimming louver 2, and a sufficient heat insulating effect can be obtained by the daylighting heat insulating material 62.

  The daylighting heat insulating material 62 can be manufactured by an appropriate method. For example, a manufacturing apparatus 71 shown in FIG. 7A can be used. In the manufacturing apparatus 71, the translucent sheet 62 a is disposed on the stage 72. On this translucent sheet 62a, the molten resin 74 is extruded from the melt extruder 73 in order to form the resin spacer 62b. The extruded molten resin 74 is linearly transmitted on the upper surface of the translucent sheet 62 a using a roll 75. The roll 75 is formed with a plurality of resin spacers 62b and a plurality of circumferentially extending grooves. Accordingly, as shown in FIG. 7B, a plurality of resin spacers 62b can be formed at a time. Thereafter, the next translucent sheet 62a is laminated on the resin spacer 62b. The lighting heat insulating material 62 can be obtained by repeating this process.

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

Example 1
(Preparation of composition for sheet main body formation and composition for light shielding member formation)
80 parts by weight of an acrylic polymer (poly n-butyl acrylate, Mn = 5,000, MWD = 2.5, double bond equivalent 300) containing a photopolymerizable functional group (acrylate group), trimethylolpropane triacrylate (Shin Nakamura) Chemical Industry Co., Ltd., NK Ester A-TMPT 20 parts by weight, Irgacure 651 (Ciba Specialty Chemicals Co., Ltd.) 1.0 part by weight, and UV absorber CYASORB UV-24 (Ciba Specialty Chemicals Co., Ltd.) 1 0.0 part by weight was stirred and mixed with a planetary stirrer and defoamed to obtain a composition for forming a sheet body (A).

  Next, 70 parts by weight of an acrylic polymer (polyn-butyl acrylate, Mn = 5,000, MWD = 2.5, double bond equivalent 1500) containing a photopolymerizable functional group (acrylate group), trimethylolpropane triacrylate (Shin-Nakamura Chemical Co., Ltd., NK Ester A-TMPT) 30 parts by weight, carbon black (Degussa Japan, Special Black 4) 40 parts by weight and Irgacure 651 (Ciba Specialty Chemicals) 7.0 weight The part was stirred and mixed with a planetary stirrer, defoamed, and kneaded with three rolls to obtain a light shielding member forming composition (B).

(Preparation of light control louver sheet)
Nickel mold having the grid pattern shown in FIG. 5 (width of projections X in FIG. 5 = 10 μm, spacing Y of projections in FIG. 5 = 70 μm, height Z of projections in FIG. 5 = 100 μm, sectional shape of projections) : Rectangle, mold size: 50 mm x 50 mm), after treating the surface with a fluorine-based mold release agent, weirs are formed around the surface, and the above composition for forming the sheet body (A) is placed on the mold. The film was coated with a blade so that the thickness after curing was 1 mm, and was irradiated with 3000 mJ / cm ² of ultraviolet light using a high-pressure mercury lamp, cured, and then released from the mold. When the surface shape of the obtained sheet main body was observed, the surface shape pattern of the mold was almost transferred, and a plurality of concave portions having a shape obtained by inverting the convex portions were formed.

Next, the surface portion outside the concave portion of the obtained sheet main body is masked, the light shielding member forming composition (B) is printed on the concave portion, irradiated with 10,000 mJ / cm ² of ultraviolet rays with a high-pressure mercury lamp, and cured. I let you.

  In this way, the light control louver sheet shown in FIG. 1A in which a light-shielding member made of a viscoelastic body was embedded in a permeable sheet main body made of a viscoelastic body was produced.

(Measurement of storage modulus G ')
The elastic modulus of the light transmissive viscoelastic sheet was measured using a dynamic viscoelasticity measuring device (“ARES” manufactured by Rheometrics) under the conditions of a strain amount of 1.0% and a frequency of 1 Hz by a shearing method. Measurement was performed at a temperature elevation rate of 3 ° C./min.

  The results are shown in Table 1.

(Production of light control body)
The light control louver sheet was sandwiched between two glass substrates having a thickness of 2 mm and pressure-bonded with an autoclave at a pressure of 10 atm and a heating temperature of 70 ° C. for 30 minutes to prepare a light control glass.

(Measurement of visible light transmittance (Tv))
Using a direct writing spectrophotometer (“UV3100” manufactured by Shimadzu Corporation), the light transmittance of the light control glass is measured at 300 to 800 nm, and the visible light transmittance (Tv) of 380 to 780 nm is measured according to JIS Z 8722. Asked. Tv was 78%. Next, one glass substrate is fixed, and the other glass substrate is shifted by 1 mm in the shearing direction by applying a force of 7N perpendicular to the line direction of the louver, and dimming as shown in FIG. The louver sheet for use was deformed, and light was shielded by extending the main body light shielding member in an oblique direction. The visible light transmittance (Tv) of the light control glass in this state was measured with a direct spectrophotometer. As a result, Tv was 8%.

(Example 2)
(Preparation of composition for sheet main body formation and composition for light shielding member formation)
Thermosetting silicone rubber Sylpot 184 100 parts by weight of main agent (Toray Dow Corning) and 0.3 part by weight of Sylpot 184 curing agent (Toray Dow Corning) are stirred and degassed to provide light-transmitting viscoelasticity. A composition (C) for forming a sheet main body was prepared.

  Next, 100 parts by weight of a thermosetting silicone rubber Sylpot 184 (manufactured by Toray Dow Corning), 0.3 parts by weight of Sylpot 184 curing agent (manufactured by Toray Dow Corning) and carbon black (manufactured by Degussa Japan, Special Black 4) 40 parts by weight of the mixture was stirred and mixed, defoamed, and kneaded with three rolls to obtain a light shielding layer forming composition (D).

(Preparation of light control louver sheet)
The thickness of the sheet body after curing is 1 mm with respect to the mold shown in FIG. 5 whose surface is treated with the above-mentioned composition (C) for forming a light transmissive and viscoelastic sheet body with a fluorine-based release agent. After coating with a doctor blade and heating in an oven at 80 ° C. for 2 hours to cure, it was released from the mold. When the surface shape of the obtained sheet main body was observed, the surface shape pattern of the mold was almost transferred.

  Next, the surface portion excluding the concave portion of the obtained sheet main body was masked, the light shielding member forming composition (D) was printed on the concave portion, and was cured by heating in an oven at 80 ° C. for 2 hours.

  Thus, the light control louver sheet | seat by which the light-shielding member which consists of a viscoelastic body was alternately arrange | positioned to the sheet | seat main body which consists of a viscoelastic body was produced.

(Measurement of storage modulus)
About the said light control louver sheet | seat obtained in Example 2, it carried out similarly to Example 1, and measured the storage elastic modulus. The results are shown in Table 1 below.

(Production of light control glass and measurement of visible light transmittance)
Using the light control louver sheet obtained in Example 2, a light control glass was produced in the same manner as in Example 1, and the visible light transmittance was measured in the same manner as in Example 1. The results are shown in Table 1 below.

(Example 3)
(Preparation of composition for sheet main body formation and composition for light shielding member formation)
According to Example 1, the light transmissive layer forming composition (A) was obtained.

  Next, 70 parts by weight of an acrylic polymer (polyn-butyl acrylate, Mn = 5,000, MWD = 2.5, double bond equivalent 1500) containing a photopolymerizable functional group (acrylate group), trimethylolpropane triacrylate (Manufactured by Shin-Nakamura Chemical Co., Ltd., NK Ester A-TMPT) 30 parts by weight, tin-doped indium oxide (average primary particle diameter 20 nm) 50 parts by weight, Irgacure 651 (manufactured by Ciba Specialty Chemicals) 7.0 weight The part was stirred and mixed with a planetary stirrer, defoamed, and kneaded with three rolls to obtain a light shielding member forming composition (E).

(Preparation of louver sheet for heat ray dimming)
A sheet main body was produced in the same manner as in Example 1 using the sheet main body forming composition (A).

Next, the surface portion of the obtained sheet main body excluding the concave portion is masked, the light shielding layer forming composition (E) is printed on the concave portion, and ultraviolet rays of 10,000 mJ / cm ² are irradiated with a high-pressure mercury lamp. And cured. Thus, the louver sheet | seat for heat ray light control shown to Fig.1 (a) was produced.

(Measurement of storage modulus)
About the said light control louver sheet | seat obtained in Example 3, it carried out similarly to Example 1, and measured the storage elastic modulus. The results are shown in Table 1 below.

(Production of light control glass and measurement of visible light transmittance)
Using the light control louver sheet obtained in Example 3, a light control glass was produced in the same manner as in Example 1, and the visible light transmittance was measured in the same manner as in Example 1. The results are shown in Table 1 below.

(Comparative Example 1)
(Preparation of composition for forming light transmission layer and composition for forming light shielding layer)
Thermosetting silicone rubber Sylpot 184 main component (manufactured by Toray Dow Corning) 100 parts by weight and 10.0 parts by weight of Sylpot 184 curing agent (manufactured by Toray Dow Corning) are stirred and defoamed to obtain a light transmissive viscoelasticity. A composition (F) for forming a sheet was prepared.

  Next, 100 parts by weight of thermosetting silicone rubber Sylpot 184 (manufactured by Toray Dow Corning), 10.0 parts by weight of Sylpot 184 curing agent (manufactured by Toray Dow Corning), and carbon black (manufactured by Degussa Japan, Special Black 4) 40 parts by weight was stirred and mixed, defoamed, and kneaded with three rolls to obtain a light shielding layer forming composition (G).

(Preparation of light control louver sheet)
A doctor blade having the composition (F) for forming a light-transmitting viscoelastic sheet formed on the surface shown in FIG. 4 having a surface treated with a fluorine-based release agent so that the thickness after curing is 1 mm. After being applied and cured in an oven at 80 ° C. for 2 hours, it was released from the mold. When the surface shape of the obtained sheet was observed, the surface shape pattern of the mold was almost transferred.

  Next, the surface portion excluding the concave portion of the obtained sheet main body was masked, the light shielding member-forming composition (G) was printed on the concave portion, and cured in an oven at 80 ° C. for 2 hours.

  In this way, the light control louver sheet shown in FIG.

(Measurement of storage modulus)
About the said light control louver sheet | seat obtained in the comparative example 1, it carried out similarly to Example 1, and measured the storage elastic modulus. The results are shown in Table 1 below.

(Production of light control glass and measurement of visible light transmittance)
Using the light control louver sheet obtained in Comparative Example 1, a light control glass was prepared in the same manner as in Example 1, and the visible light transmittance before deformation of the louver layer was measured in the same manner as in Example 1. Subsequently, as in Example 1, one glass substrate was fixed, and the other glass substrate was perpendicular to the line direction of the louver, and a force of 7 N was applied. At this time, almost no deformation of the louver layer was observed. There wasn't. In this state, the visible light transmittance was measured. The results are shown in Table 1 below.

  However, when producing the light control glass, the pressure was 5 atm and the heating temperature was 50 ° C. by an autoclave, and the glass substrate was bonded to the surface of the light control louver sheet for 30 minutes.

(Comparative Example 2)
(Preparation of composition for sheet main body formation and composition for light shielding member formation)
In the same manner as in Comparative Example 1, a composition (F) for forming a sheet main body was produced. Next, a light shielding layer forming composition (H) was obtained in accordance with Comparative Example 1 except that 50 parts by weight of tin-doped indium oxide (average primary particle diameter 20 nm) was used instead of 40 parts by weight of carbon black. It was.

  In this way, the light control louver sheet shown in FIG.

(Measurement of storage modulus)
About the said light control louver sheet | seat obtained in the comparative example 2, it carried out similarly to Example 1, and measured the storage elastic modulus. The results are shown in Table 1 below.

(Production of light control glass and measurement of visible light transmittance)
Using the light control louver sheet obtained in Comparative Example 2, a light control glass was prepared in the same manner as in Example 1, and the visible light transmittance before deformation of the louver layer was measured in the same manner as in Example 1. Subsequently, as in Example 1, one glass substrate was fixed, and the other glass substrate was perpendicular to the line direction of the louver, and a force of 7 N was applied. At this time, almost no deformation of the louver layer was observed. There wasn't. In this state, the visible light transmittance was measured. The results are shown in Table 1 below.

  However, when manufacturing the light control glass, the pressure was 5 atm and the heating temperature was 50 ° C. by an autoclave, and the glass substrate was bonded to the surface of the light control louver sheet for 30 minutes.

Example 4
In Example 4, the daylighting heat insulating device 61 shown in FIG. 6 was produced. First, a laminated light control body was prepared in which the light control louver sheet 2 obtained in Example 1 was sandwiched between a first glass plate 63 and a second glass plate 64 as shown in FIG. The laminated dimmer is opposed to the daylighting heat insulating material 62 via the air layer 65, and a third glass plate 67 is disposed outside the daylighting heat insulating material 62 via the air layer 66. Such a laminated structure was fixed so as to secure the air layers 65 and 66, and the daylighting heat insulating device 61 was obtained. In the daylighting heat insulating device 61, the thickness of the first glass plate 63 was 2 mm, the thickness of the light control louver sheet 2 was 2 mm, and the thickness of the second glass plate 64 was 2 mm. The thickness of the air layers 65 and 66 was 0.5 mm. The daylighting heat insulating material 62 has a five-layer structure, and the overall thickness is 10 mm. The thickness of the third glass plate 67 was 2 mm.

  About the daylighting heat insulating material 62, it obtained by the manufacturing method shown with reference to FIG. 7 (a), (b). In the daylighting heat insulating material 62, a PET film was used as the translucent sheet 62a, and its thickness was 0.125 mm. The resin spacer 62b is made of acrylic resin, and its diameter is 1.85 mm. The translucent sheet 62a and the resin spacer 62b were adhered by applying a hot melt adhesive to the outer surface of the resin spacer 62b. Since the diameter of the resin spacer 62b is 1.85 mm, the thickness of the air layer 62c of the daylighting heat insulating material 62 is 1.85 mm.

(Example 5)
In the same manner as in Example 4, a daylighting heat insulating device 61 was produced. However, the light control louver sheet obtained in Example 2 was used as the light control louver sheet. Further, a 2 mm transparent acrylic resin plate was used in place of the third glass plate 67. Further, the daylighting heat insulating material 62 has a five-layer structure and a thickness of 4 mm. The thickness of each layer was as follows. The other points were the same as in Example 4.

  The thickness of the first glass plate 63 is 2 mm, the thickness of the light control louver sheet 2 is 1 mm, and the thickness of the second glass plate 64 is 2 mm. Therefore, the thickness of the first glass plate 63, the dimming louver sheet 2 and the second glass plate 64 made of the laminated dimmer is 5 mm. The thicknesses of the air layers 65 and 66 were both 0.5 mm.

(Example 6)
In the same manner as in Example 5, a daylighting heat insulating device 61 was produced. However, in place of the third glass plate 67 in FIG. 6, a glass plate having a thickness of 2 mm was used in the same manner as in Example 4 instead of the acrylic resin plate. Moreover, the thickness and laminated structure of each layer were as follows.

  The thickness of the first glass plate 63 is 2 mm, the thickness of the light control louver sheet 2 is 1 mm, and the thickness of the second glass plate 64 is 2 mm. Therefore, the layer thickness of the light control laminate is 5 mm. The thickness of each of the air layers 65 and 66 was 0.5 mm. The lighting heat insulating material 62 has a laminated structure of 7 layers, and the layer thickness is 12 mm.

(Comparative Example 3)
A louver provided with plastic blades having a depth dimension of 30 mm was attached to one side of a float glass having a thickness of 3 mm to obtain Comparative Example 3. In the case where the louver provided with the plastic blades is in a light-shielded state and in the case where the louver is in the maximum open state, the heat flow rate and the solar heat gain rate were measured as described below.

(Evaluation of Examples 4 to 6 and Comparative Example 3)
About the structure of the lighting insulation apparatus of Examples 4-6 and the comparative example 3, 1) The solar heat acquisition rate in joinery composition in the following points, 2) Evaluation of heat insulation when installed as an inner window, and 3) Inner window The solar heat acquisition rate when installed as was measured.

1) Solar heat acquisition rate: solar heat acquisition rate of the lighting heat insulation device itself It was calculated from the optical measurement data of each layer by a method based on JIS A 1420, and the solar heat heat measurement rate of the daylighting heat insulation device 61 was obtained. In this case, the dimming louver sheet 2 is changed to the open state shown in FIG. 6, that is, in the case of the opening mode in which heat is not blocked, and the dimming louver sheet 2 is deformed. Asked.

2) Thermal insulation evaluation: measurement of the heat transmissivity of the daylighting thermal insulation device 61 itself, an opening having a width of 300 mm × height of 1200 mm, and a planar rubber heater that can be temperature controlled by a slidac on the surface facing the opening. The heat insulation box was fixed so as to close the opening. The lighting and heat insulating device obtained in Examples 4 to 6 or Comparative Example 3 was attached to the opening so as to close the opening. The planar rubber heater was controlled so that the temperature difference between the inside and outside was about 20 ° C. The amount of heat passing through the daylighting heat insulating device was measured with a heat flow plate. The heat transmissivity (W / m ² · K) was determined from the amount of heat (heat flow rate) passing through the heat flow plate when the steady state was reached and the temperature difference between the heated and unheated air. That is, the heat transmissibility is obtained by the following equation.

Thermal conductivity (W / m ² · K) = Heat flow rate (W / m ² ) / Air temperature difference (K)
The amount of heat passing through the dimming louver sheet 2 in the light shielding or heat shielding mode and in the opening mode was measured to determine the heat transmissivity.

3) Evaluation of heat insulation: Evaluation of heat insulation in a state where the daylighting heat insulating device is installed as an inner window. In the opening of a width 300 mm × height 1200 mm, a heat insulating box containing a planar rubber heater is opened as in 2) above. It was attached so as to be closed. In addition, a float glass plate having a width of 300 mm, a height of 1200 mm, and a thickness of 3 mm was attached to the opening, and the opening of the window portion was closed. After that, the daylight insulation heat insulation apparatus of Examples 4 to 6 or Comparative Example 3 so as to face the float glass plate on the side opposite to the side where the heat insulation box of the float glass plate is installed, that is, the inside is separated by 50 mm. Was attached as an inner window so as to seal the periphery. The planar rubber heater was controlled so that the temperature difference between the inside and outside of the window was about 20 ° C., and the amount of heat passing through the daylighting heat insulating device was measured. The heat transmissivity (W / m ² · K) was calculated from the amount of heat passing through and the temperature of air in the same manner as in 2).

  The passing heat quantity was measured for each of the case where the light control louver sheet was set to the light shielding or heat shielding mode and the opening mode, and the heat transmissivity was obtained.

  The results are shown in Table 2 below.

DESCRIPTION OF SYMBOLS 1 ... Light control body 2 ... Light control louver sheet 3, 4 ... Translucent board | substrate 5 ... Sheet | seat main body 5a ... Light incident surface 5b ... Light-projection surface 6 ... Light-shielding member 6a ... Tip 6b ... Base end 11 ... Mold 12 ... Mold body 13 ... Convex part 13a ... Convex part width 13b ... Convex part interval 13c ... Convex part height 21, 22, 23 ... Dimmer louver sheet 31, 41 ... Dimmer 42 ... Adhesive layer Or adhesive layer 51 ... light control louver sheet 52 ... sheet main body 61 ... daylighting heat insulating device 62 ... daylighting heat insulating material 62a ... translucent sheet 62b ... resin spacer 62c ... air layer 63 ... first glass plate 64 ... first Second glass plate 65, 66 ... Air layer 67 ... Third glass plate 71 ... Manufacturing apparatus 72 ... Stage 73 ... Melt extruder 74 ... Molten resin 75 ... Roll

Claims (9)

A translucent sheet body made of a viscoelastic body and having a light incident surface and a light emitting surface facing the light incident surface;
A plurality of light blocking members provided in the sheet body and extending in a direction intersecting the light incident surface, so that light incident from the light incident surface is emitted from a partial region of the light emitting surface. The plurality of light shielding members are arranged in the surface direction of the light incident surface, and when the shearing force is applied so that the light incident surface and the light emitting surface are displaced in the surface direction, the light A dimming louver sheet in which the extending direction of the light-shielding member changes so as to reduce the amount of light reaching the emission surface.   2. The aspect ratio as a ratio of a length extending in a direction intersecting the light incident surface of the light shielding member and a width being a dimension in a direction orthogonal to the length is in a range of 1 to 20. Light control louver sheet.   The light control louver sheet according to claim 1 or 2, wherein a pitch at which the plurality of light shielding members are arranged is equal to or greater than a width of the light shielding member.   The light control louver sheet according to claim 3, wherein a direction in which the light shielding member extends is a direction orthogonal to the light incident surface.   The light control louver sheet according to any one of claims 1 to 4, wherein the light shielding member is a heat shielding light shielding member that shields heat rays.   The light control louver sheet according to claim 5, wherein the heat-shielding light-shielding member comprises a light-shielding viscoelastic material containing light-shielding oxide particles having a heat ray shielding function and / or an organic dye having a heat ray shielding function. The said sheet | seat main body consists of a viscoelastic body whose storage elastic modulus G 'in -20 degreeC-50 degreeC is 1.0x10 < ⁵ > dyn / cm < ² > or less, The any one of Claims 1-6. Light control louver sheet.   A light control body comprising the light control louver sheet according to any one of claims 1 to 7 and a translucent substrate laminated on both surfaces of the light control louver sheet.   A shearing force is applied to the dimming louver sheet so that the light incident surface and the light emitting surface of the dimming louver sheet according to any one of claims 1 to 7 are shifted in a plane direction, and the shearing force is adjusted. A dimming method for dimming light.

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