JP6015353B2 - Light control sheet and light incident part with light control sheet - Google Patents

Description

  The present invention relates to a light control sheet attached to a light incident portion such as a window glass that takes in light, and a light incident portion with a light control sheet provided with the light control sheet.

  Conventionally, a light control sheet in which a single layer film or a plurality of films are laminated, for example, a heat ray suppressing window pasting film or the like is known. Such a light control sheet has a performance about a heat absorption effect that absorbs light such as sunlight and blocks light regardless of whether light such as sunlight is incident from the front side or light such as sunlight is incident from the rear side. There is no difference. For this reason, the operator can affix on the light incident part, such as a window glass, without minding the front and back surfaces (front and back) of the light control sheet.

  On the other hand, a light transmitting portion made of a light transmissive material that transmits light such as sunlight and a heat ray absorbing material that absorbs light such as sunlight, and a predetermined interval (pitch) along a predetermined direction in the plane. Thus, there is known a light control sheet having a plurality of heat ray absorbing portions arranged (see Patent Document 1).

  In such a light control sheet as disclosed in Patent Document 1, the transverse cross section (cross section cut in a direction perpendicular to the “predetermined direction” in the plane) of the heat ray absorbing portion has a trapezoidal shape. The heat absorption effect is different between light such as sunlight irradiated from the solar light and light such as sunlight irradiated from the rear side. That is, the heat absorption effect is higher when light such as sunlight is incident from the lower side of the trapezoid than when light such as sunlight is incident from the upper side of the trapezoid. For this reason, in order to efficiently exhibit the effect of absorbing light such as sunlight by the heat ray absorbing portion, light incident on the window glass or the like so that the lower side of the heat ray absorbing portion faces the direction in which light such as sunlight enters. It needs to be affixed to the part.

  In this respect, since the heat ray absorbing portion is provided inside the light control sheet, the surface of the light control sheet is smooth, and the front and back surfaces (front and back) of the light control sheet cannot be determined by touch. Moreover, even if the heat ray absorbing portion is colored, it is difficult to visually distinguish the front and back surfaces (front and back) of the heat ray absorbing portion, and when the heat ray absorbing portion transmits visible light and is transparent, it is visually absorbed. It is particularly difficult to distinguish the front and back surfaces (front and back) of the part.

JP 2010-259406 A

  In view of the above points, the present invention provides a light control sheet capable of easily grasping the front and rear surfaces (front and back) with visual sense, touch sense, and the like.

The light control sheet according to the first aspect of the present invention comprises:
A light control sheet attached to a light incident portion on which light is incident,
A light control layer comprising: a plurality of light control units that control the light; and a light transmission unit that is provided between at least the light control units and transmits the light;
A protective film provided on the rear surface side of the light control layer,
The light control unit is provided along a predetermined direction in the plane of the light control sheet,
The light control unit shows different effects between the light irradiated from the front side and the light irradiated from the rear side,
The protective film has a mark for indicating the front side or the rear side.

In the light control sheet according to the first aspect of the present invention,
The light control unit includes a plurality of light reflecting units that reflect the light and take in the light on a side opposite to the light incident side, and / or a plurality of heat rays that absorb the heat rays when the light includes heat rays. An absorption part may be sufficient.

In the light control sheet according to the first aspect of the present invention,
The protective film has a notch,
The notch may function as the mark.

In the light control sheet according to the first aspect of the present invention,
The notch may be provided at a corner of the protective film.

In the light control sheet according to the first aspect of the present invention,
The protective film has at least one rounded corner and at least one angular corner,
A combination of the rounded corner portion and the angular corner portion may function as the mark.

In the light control sheet according to the first aspect of the present invention,
The protective film has a mark printed or stamped to indicate the predetermined direction,
The mark may function as the mark.

In the light control sheet according to the first aspect of the present invention,
The mark may be visible by irradiating light of a specific wavelength.

In the light control sheet according to the first aspect of the present invention,
The protective film has a convex portion for indicating the predetermined direction,
The convex portion may function as the mark.

In the light control sheet according to the first aspect of the present invention,
The protective film has a recess or a hole for indicating the predetermined direction,
The recess or the hole may function as the mark.

In the light control sheet according to the first aspect of the present invention,
The protective film has beads, bubbles or hollow particles for indicating the predetermined direction,
The beads, the bubbles or the hollow particles may function as the mark.

In the light control sheet according to the first aspect of the present invention,
The protective film has a protruding portion protruding at a location where the light control layer is not provided in the surface direction,
The protrusion may function as the mark.

In the light control sheet according to the first aspect of the present invention,
The protective film has a half cut part and a protective film body part separate from the half cut part,
The half cut portion may be peeled off prior to the protective film main body portion, and may function as the mark.

The light control sheet according to the second aspect of the present invention is:
A light control sheet attached to a light incident portion on which light is incident,
A light control layer comprising: a plurality of light control units that control the light; and a light transmission unit that is provided between at least the light control units and transmits the light;
A seal member provided in a peelable manner on the front side or the rear side of the light control layer,
The light control unit is provided along a predetermined direction in the plane of the light control sheet,
The light control unit shows different effects between the light irradiated from the front side and the light irradiated from the rear side,
The seal member may have a mark for indicating the front side or the rear side.

In the light control sheet according to the second aspect of the present invention,
The light control unit includes a plurality of light reflecting units that reflect the light and take in the light on a side opposite to the light incident side, and / or a plurality of heat rays that absorb the heat rays when the light includes heat rays. An absorption part may be sufficient.

The light incident part with a light control sheet of the present invention is
A light incident part for taking in light;
Any one of the light control sheets provided in the light incident portion described above,
Is provided.

  According to the present invention, the protective film, release film or seal member has a mark for indicating the front side or the rear side. For this reason, the front and back surfaces (front and back) of the light control sheet can be easily grasped visually or by touch.

  In addition, since all of the protective film, the release film and the sealing member are peeled off when attached to the light incident part such as the window glass or after being attached, the mark is attached after being attached to the light incident part such as the window glass. Therefore, it is possible to prevent the appearance from being deteriorated, the visual field from being obstructed, and the effect to be achieved by each layer included in the light control sheet from being inhibited.

FIG. 1 is a schematic side sectional view of a light incident part with a light control sheet according to a first embodiment of the present invention. FIG. 2 is a schematic side sectional view of the light control sheet according to the first embodiment of the present invention. FIG. 3 is a schematic plan view of the light control sheet according to the first embodiment of the present invention viewed from the rear side. FIG. 4 is a schematic plan view of a modification of the light control sheet according to the first embodiment of the present invention viewed from the rear side. FIG. 5 is a schematic side sectional view of another modification of the light control sheet according to the first embodiment of the present invention. FIG. 6 is a schematic plan view showing an aspect in which the protective film has a notch as a mark in the first embodiment. FIG. 7 is a schematic plan view showing an aspect in which the protective film has rounded corners and angular corners as marks in the first embodiment. FIG. 8 is a schematic plan view showing an aspect in which the protective film has a mark as a mark in the first embodiment. FIG. 9 is a schematic plan view showing an aspect in which the protective film has a convex portion as a mark in the first embodiment. FIG. 10 is a schematic plan view showing an aspect in which the protective film has a recess or a hole as a mark in the first embodiment. FIG. 11 is a schematic plan view showing an aspect in which the protective film has beads, bubbles, or hollow particles as marks in the first embodiment. FIG. 12 is a schematic plan view showing an aspect in which the protective film has a protruding portion as a mark in the first embodiment. FIG. 13 is a schematic plan view showing an aspect in which the protective film has a half-cut portion as a mark in the first embodiment. FIG. 14 is a schematic plan view showing a second embodiment in which the seal member has a mark. FIG. 15 shows a mode in which a light reflecting portion is used instead of the heat ray absorbing portion, and corresponds to FIG.

First Embodiment << Configuration >>
Hereinafter, a first embodiment of a light control sheet according to the present invention and a light incident portion with a light control sheet including such a light control sheet will be described with reference to the drawings. Here, FIGS. 1 to 13 are diagrams for explaining the first embodiment of the present invention.

  In the present embodiment, the heat control unit 11 is used as the light control unit. However, any method may be used as long as the way of function changes according to the direction. The absorption unit 11 is not limited. In the present embodiment, “sunlight” is used as an example of “light”. However, the present invention is not limited to this.

  As shown in FIG. 1, the light control sheet 100 of the present embodiment is attached to a light incident part 200 that takes in sunlight. The light incident portion 200 refers to an opening for taking in sunlight provided in a building, for example, an inorganic glass such as a window or an organic glass (hereinafter also referred to as “window glass or the like”). . Moreover, the light incident part with a light control sheet of the present embodiment includes a light incident part 200 for taking in sunlight and the light control sheet 100 of the present embodiment. FIG. 1 is a schematic side sectional view of a light incident part with a light control sheet according to the present embodiment.

  A light control sheet 100 shown in FIG. 1 includes a heat ray absorbing layer (light control layer) 10 that absorbs heat rays contained in sunlight, and a base material layer 20 provided on the rear side of the heat ray absorbing layer 10. Yes. Among these, the heat ray absorbing layer 10 is located between the heat ray absorbing group including a plurality of heat ray absorbing portions 11 that absorb the heat rays contained in sunlight and at least the heat ray absorbing portion 11 (in this embodiment, the heat ray absorbing portion 11 And a light transmission portion 16 that transmits sunlight. Each heat ray absorbing portion 11 includes a heat ray absorbing material that absorbs heat rays. By the way, in the present application, “front surface” means a surface located on the light incident portion 200 side when the light control sheet 100 is attached to the light incident portion 200, and “rear surface” It means the surface opposite to the “front surface” (see FIG. 1). Incidentally, the above-mentioned heat ray generally indicates infrared rays, and specifically includes a wavelength region of 760 to 830 nm or more.

  Before being attached to the light incident part 200, the light control sheet 100 of the present embodiment is a protective film 40 for protecting the base material layer 20 on the rear surface side of the base material layer 20, as shown in FIG. Is provided. FIG. 2 is a schematic side sectional view of the light control sheet 100 according to the present embodiment. Incidentally, the light control sheet 100 according to the present embodiment does not include an adhesive layer, and the light control sheet 100 or the light incident part 200 is coated with an adhesive when being attached to the light incident part 200, and is formed by the adhesive. The adhesive layer 30 is attached to the light incident part 200 (see FIG. 1).

  The heat ray absorbing portion 11 protrudes in a direction (thickness direction) from the front surface toward the rear surface (see FIG. 1), and is provided along a predetermined direction in the surface (see FIG. 3). FIG. 3 is a schematic view of the light control sheet 100 according to the present embodiment as viewed from the rear side. Incidentally, although the heat ray absorption part 11 is contained in the heat ray absorption layer 10 and may protrude from the heat ray absorption layer 10, it is better to be contained in the heat ray absorption layer 10.

  The heat ray absorbing portions 11 along the predetermined direction are not necessarily constant but are arranged at a fixed interval (pitch) and are parallel to each other (see FIG. 3). By the way, in the present embodiment, the “predetermined direction” is a direction that becomes the “horizontal direction” when the light control sheet 100 is attached to the light incident portion 200 (see FIG. 3). Moreover, the heat ray absorption part 11 does not necessarily need to exist continuously along a predetermined direction, and may exist intermittently along a predetermined direction (refer FIG. 4). In addition, FIG. 4 is the schematic which looked at the modification of the light control sheet | seat 100 by this Embodiment from the rear surface side. By the way, in FIG.3 and FIG.4, only the heat ray absorption part 11 and the light transmissive part 16 are shown in figure for convenience of explanation.

  The heat ray absorption part 11 of this Embodiment shows the heat absorption effect which differs with the light irradiated from the front side, and the light irradiated from the back surface side. In the aspect shown in FIG. 1, the transverse cross section of the heat ray absorbing portion 11 (the cross section cut in a direction perpendicular to the “predetermined direction” in the plane) has a trapezoidal shape, and light is incident from the lower side of the trapezoid. The heat absorption effect is higher in the case than in the case where light is incident from the upper side of the trapezoid. That is, in the light control sheet 100 of the aspect shown in FIG. 1, the heat absorption effect with respect to the light irradiated from the front side is larger than the heat absorption effect with respect to the light irradiated from the rear side. In the present embodiment, description will be made using an aspect in which the cross section of the heat ray absorbing portion 11 is trapezoidal, but the cross section of the heat ray absorbing portion 11 is not necessarily trapezoidal, It may be triangular.

  By the way, in this Embodiment, as shown in FIG. 1, although demonstrated based on the aspect which affixed the light-control sheet | seat 100 from the indoor side on the light-incidence parts 200, such as a window glass of a building, it is restricted to this. Instead, as shown in FIG. 5, the light control sheet 100 can be attached from the outdoor side of the light incident part 200 such as a window glass of a building. In this way, when the light control sheet 100 is attached from the outdoor side of the light incident part 200, the bottom part (the lower side of the trapezoidal shape in the cross section) of the heat ray absorbing part 11 is the light incident part 200 side. Instead, it comes to be located on the base material layer 20 side as shown in FIG. In addition, in the light control sheet 100 of the aspect shown in FIG. 5, the heat absorption effect with respect to the light irradiated from the rear side is larger than the heat absorption effect with respect to the light irradiated from the front side. Incidentally, in the present application, the “width” of the heat ray absorbing portion 11 means a length in a direction orthogonal to the above-described “predetermined direction” in the plane in which the heat ray absorbing portion 11 extends.

  The protective film 40 of the present embodiment has a “mark” for indicating the front side or the rear side of the light control sheet 100. Hereinafter, various aspects of the “mark” will be described. The three parallel bidirectional arrows shown in each of FIGS. 6 to 13 indicate the “predetermined direction” described above. Moreover, in each of FIG. 6 thru | or FIG.11 and FIG.13, only the protective film 40 is shown and other layers, such as the heat ray absorption layer 10 and the base material layer 20, are not shown. In FIG. 12, only the protective film 40 and the base material layer 20 are shown, and other layers such as the heat ray absorbing layer 10 are not shown.

[Notch 60]
In the first aspect, as shown in FIG. 6, the protective film 40 has a notch 60, and the notch 60 functions as a mark.

  As shown in FIGS. 6A and 6B, the notch 60 may be provided at one corner of the protective film 40, or the notch 60 is provided in the protective film 40 as shown in FIG. The notches 60 may be provided at the three corners of the protective film 40 as shown in FIGS. 6D and 6E. Moreover, the notch 60 does not necessarily need to be provided in the corner | angular part of the protective film 40, for example, may be provided on the edge | side of the protective film 40 like FIG.6 (f). As shown in FIG. 6C, in the embodiment in which the notches 60 are provided at the two corners of the heat ray absorbing layer 10, the angle of the notch 60 at one corner and the corner at another corner. The angles of the notches 60 are different.

[Shape of corner]
In the second embodiment, the protective film 40 has at least one rounded corner 65 and at least one angular corner 66. Incidentally, it is preferable that one or three rounded corner portions 65 are provided so that the front and back surfaces (front and back) of the light control sheet 100 can be easily distinguished.

  In the embodiment shown in FIG. 7, the upper right corner of the drawing is a rounded corner 65, and the remaining three corners are angular corners 66.

[Mark 70]
In the third aspect, the protective film 40 has a mark 70 that is printed or engraved to indicate the front side or the rear side (typically the rear side) of the light control sheet 100, and the mark 70 is Functions as a mark. In addition, the marking of this Embodiment can also be stamped with a laser beam, for example. Further, by making the color to be printed black (typically black), visual discrimination can be made easier.

  In the mode shown in FIG. 8A, the letters “table” indicating the front (front) side are written. In the mode shown in FIG. 8B, “main” indicating the front (front) side is written. "" Is written. Of course, the mark 70 need not be such a character, and may be a simple symbol, graphic, or the like.

[Convex part 75]
In the fourth aspect, the protective film 40 has a convex part 75 for indicating the front side or the rear side (typically the rear side) of the light control sheet 100, and the convex part 75 functions as a mark.

  In the aspect shown in FIG. 9, the letters “front” indicating the front (front) side are formed by the convex portions 75. In addition, the convex part 75 does not need to be such a character, A simple symbol, a figure, etc. may be sufficient.

[Recess 80 or hole 81]
In the fifth aspect, the protective film 40 has a recess 80 or a hole 81 for indicating the front side or the rear side (typically the rear side) of the light control sheet 100, and the recess 80 or the hole 81 is a mark. Function as.

  In the embodiment shown in FIG. 10, the letters “front” indicating the front (front) side are formed by the recess 80 or the hole 81. In addition, the recessed part 80 or the hole part 81 does not need to be such a character, A simple symbol, a figure, etc. may be sufficient.

[Beads 85, bubbles 86 or hollow particles 87]
In the sixth aspect, the protective film 40 has beads 85, bubbles 86 or hollow particles 87 for indicating the front side or the rear side of the light control sheet 100, and the beads 85, bubbles 86 or hollow particles 87 are marks. Function. Any one of these beads 85, bubbles 86, or hollow particles 87 can be used, any two can be used, or all three can be used.

  In the embodiment shown in FIG. 11, a bead 85, a bubble 86 or a lump of hollow particles 87 is provided in the upper right of the drawing.

[Protrusion 90]
In the seventh aspect, the protective film 40 has a protruding portion 90 protruding at a location where the heat ray absorbing layer 10 and the base material layer 20 are not provided in the surface direction, and the protruding portion 90 functions as a mark.

  In the aspect shown in FIG. 12, the protrusion part 90 is provided in each of the upper left end part and upper right end part of drawing.

[Half cut part 42]
In the eighth aspect, the protective film 40 has a half cut part 42 and a protective film main body part 41 separate from the half cut part 42. And the half cut part 42 can peel from the base material layer 20 ahead of the protective film main-body part 41, and functions as a mark.

  In the embodiment shown in FIG. 13, a rectangular half-cut portion 42 smaller than the protective film main body portion 41 is provided at an upper portion of the protective film 40, and a rectangular protective film main body portion 41 is provided below the half-cut portion 42. Is provided. In addition, the half cut part 42 of this Embodiment shows the rear surface side of the light control sheet 100 typically.

  By the way, in this application, the heat ray absorption part 11 should just absorb a heat ray rather than the light transmissive part 16, and desirably absorbs a heat ray 10% or more more than the light transmissive part 16. FIG.

  Next, materials used in the base material layer 20, the light transmission part 16, the heat ray absorbing part 11, the protective film 40, and the pressure-sensitive adhesive, their thicknesses, and the like will be briefly described.

(Base material layer 20)
As the base material layer 20, for example, a transparent film such as polyethylene terephthalate (PET) or polycarbonate (PC) is used. The thickness of the base material layer 20 is 5 to 200 μm, preferably 10 to 150 μm, and more preferably 50 to 100 μm. If the thickness of the base material layer 20 is less than 5 μm, wrinkles may occur during production, resulting in poor productivity, and conversely, if the thickness of the base material layer 20 is greater than 200 μm, the cost increases, and the light described later If the ionizing radiation is irradiated through the base material layer 20 when the transmissive part 16 is cured, there may be a problem that the ionizing radiation is lost.

(Light transmission part 16)
As a material of the light transmission part 16, a conventionally known material can be used, but preferably a solventless resin such as an epoxy acrylate having ionizing radiation curability can be used. When forming the light transmission part 16, the solventless resin is extruded into a molding die and molded, and then the solventless resin is cured to form the light transmission part 16 having a recess. If necessary, it may be extruded while applying heat and pressure, or may be cured by irradiation with ionizing radiation.

  The shape of the recess can be arbitrarily determined according to the desired light absorption performance, but in the thickness direction of the light control sheet (the direction from the front surface to the rear surface) in order for the heat ray absorbing portion 11 to obtain the function as the light control sheet. It is preferably a substantially rectangular or triangular shape having a long side. The substantially rectangular shape is a shape including a square, a rectangle, and a trapezoid. Moreover, the corner | angular part of a recessed part may be round, and the tangent line which connects each corner | angular part may be a straight line or a curve.

  The heat ray absorbing part 11 described later is embedded in the concave part. However, if the width of the heat ray absorbing part 11 is wide, the heat ray absorbing part 11 may be visible, and the appearance is impaired. Therefore, the width of the concave part is preferably 50 μm or less. . Further, the heat ray absorbing performance is improved as the interval (pitch) between the heat ray absorbing portions 11 is reduced, and conversely, the area of the light transmitting portion 16 is increased as the interval between the heat ray absorbing portions 11 is increased. And it is preferable that the space | interval of a recessed part shall be the range of 0.1 micrometer-500 micrometers. Moreover, transparency is increased as the height of the heat ray absorbing portion 11 is lower, and heat ray absorbing performance is improved as the height is increased. And it is preferable that the depth of a recessed part shall be 0.1 micrometer-750 micrometers.

(Heat ray absorption part 11)
The heat ray absorbing part 11 at least partially covered with the light transmissive part 16 conveys the light transmissive part 16 formed as described above along the roll, and is a heat ray that can absorb a little heat ray of sunlight. It is formed by embedding an absorbing material in the recess of the light transmitting portion 16 and removing excess heat ray absorbing material with a squeegee or the like.

  The heat ray absorbing material described above is a resin composition containing metal oxide such as antimony-doped tin oxide (ATO) or tin-doped indium oxide (ITO) and fine particles such as lanthanum hexaboride when transparency is required. Can be used. The diameter of the ATO fine particles or the ITO fine particles is preferably 1 nm to 300 nm, and more preferably 1 nm to 100 nm, from the viewpoint of suppressing haze.

  Conventionally known resins can be used as the resin that can be used in the resin composition, and specifically, ionizing radiation curable resins can be used. Examples of ionizing radiation curable resins include reactive oligomers (epoxy acrylate, urethane acrylate, polyether acrylate, polyester acrylate, polythiol, etc.) and reactive monomers (vinyl pyrrolidone, 2-ethylhexyl acrylate, β-hydroxy acrylate). , Tetrahydrofurfuryl acrylate, etc.).

  In addition, the refractive index of the light transmission part 16 and the heat ray absorption part 11 is match | combined, and the refraction of sunlight reflected light and transmitted light is suppressed, and visibility for viewing is improved, which is preferable.

(Protective film 40)
As the protective film 40, a polyethylene terephthalate film, a polyethylene film, a polycarbonate film, or the like can be used. The thickness of the protective film 40 is preferably 5 to 100 μm. If the thickness of the protective film 40 is less than 5 μm, the role as a protective layer may be insufficient, and if it exceeds 100 μm, the cost increases.

(Adhesive)
By the way, in this Embodiment, the adhesion layer 30 is formed in the front side of the heat ray absorption layer 10 by apply | coating an adhesive to the front side of the light control sheet 100 by die coating or the like.

  In order to impart weather resistance to the pressure-sensitive adhesive layer 30, a weather-resistant agent (UVA, HALS) may be added to the pressure-sensitive adhesive. A commercially available thing is used as a weathering agent, and a well-known thing can be used as a ultraviolet absorber (UVA) and a hindered amine light stabilizer (HALS). As UVA, for example, benzotriazole UVA, triazine UVA, benzophenone UVA, salicylate UVA, acrylonitrile UVA and the like can be used. Further, as the HALS, “Tinuvin 123”, “Tinuvin 144”, “Tinuvin 292”, “Tinuvin 111FDL”, or the like can be used.

《Action ・ Effect》
Next, the operation and effect of the present embodiment having the above-described configuration will be described.

  According to this embodiment, in addition to the actions and effects described above, the following actions and effects can be achieved.

  According to the present embodiment, the protective film 40 has a mark for indicating the front side or the rear side of the light control sheet 100. For this reason, the front and back surfaces (front and back) of the light control sheet 100 can be easily grasped visually or by touch.

  This will be described below.

  Since the heat ray absorbing unit 11 is provided inside the light control sheet 100, the surface of the light control sheet 100 is smooth, and the front and back surfaces (front and back) of the light control sheet 100 cannot be determined by touch. Moreover, even if the heat ray absorbing portion 11 is colored, it is difficult to visually distinguish the front and back surfaces (front and back) of the heat ray absorbing portion 11, and when the heat ray absorbing portion 11 is transparent to visible light and transparent, Thus, it is particularly difficult to determine the front and back surfaces (front and back) of the heat ray absorbing portion 11. On the other hand, the transverse cross section (cross section cut in a direction perpendicular to the “predetermined direction” in the plane) of the heat ray absorbing portion 11 of the present embodiment has a trapezoidal shape, and the sunlight irradiated from the front side and the rear side It has different heat absorption effect with sunlight irradiated from. That is, the heat absorption effect is higher when sunlight is incident from the lower side of the trapezoid than when sunlight is incident from the upper side of the trapezoid. For this reason, in order to efficiently exhibit the sunlight absorption effect by the heat ray absorbing portion 11, it is attached to a light incident portion such as a window glass so that the lower side of the heat ray absorbing portion 11 faces the direction in which sunlight is incident. Need to be done.

  In this respect, since the front and back surfaces (front and back) of the existing light control sheet 100 are difficult to understand, when attaching the light control sheet 100 to the light incident portion 200 such as a window glass, the operator must attach the front and back surfaces (front and back). It was very difficult to determine and the work efficiency was getting worse.

  On the other hand, according to the present embodiment, the protective film 40 has a mark for indicating the front side or the rear side (front and back) of the light control sheet 100, and the light control is performed visually or tactilely. The front surface or the rear surface (front and back) of the sheet 100 can be easily grasped.

  Further, since the protective film 40 is peeled off when attached to the light incident part 200 such as a window glass or after being attached, the appearance of the protective film 40 after the attachment to the light incident part 200 such as the window glass is deteriorated. It is possible to prevent the field of view from being hindered and the effect to be achieved by each layer of the light control sheet from being hindered.

  More specifically, as shown in FIG. 6, in the aspect in which the cutout 60 is formed in the protective film 40, the operator can easily visually or tactilely touch the front surface or the rear surface (front and back) of the light control sheet 100. I can grasp it. Moreover, in this aspect, since the notch 60 is not provided in any of the heat ray absorbing layer 10 and the base material layer 20, the effect that each of these layers should perform, that is, the heat ray absorbing layer 10, absorbs sunlight. The light shielding effect and the base material layer 20 do not hinder the effect of protecting the heat ray absorbing layer 10.

  As shown in FIG. 7, in an embodiment in which the protective film 40 has at least one rounded corner 65 and at least one angular corner 66, an operator can visually and tactilely transmit light. The front surface or the rear surface (front and back) of the control sheet 100 can be easily grasped. Moreover, in this aspect, it is not necessary to make the corners of the heat ray absorbing layer 10 and the base material layer 20 rounded corners, and it is not necessary to cut these layers. For this reason, the effect which each layer should play is not inhibited also in this mode.

  As shown in FIG. 8, in an aspect in which the protective film 40 has a mark 70 that is printed or stamped to indicate the front side or the rear side (front and back) of the light control sheet 100, the operator visually The front surface or the rear surface (front and back) of the light control sheet 100 can be easily grasped. Moreover, in this aspect, since the protective film 40 is peeled off when attached to the light incident part 200 such as a window glass or after being attached, the protective film 40 is attached by the mark 70 after being attached to the light incident part 200 such as a window glass. It doesn't look bad or get out of sight.

  As shown in FIG. 9, in an aspect in which the protective film 40 has a convex portion 75 for indicating the front side or the rear side (front and back) of the light control sheet 100, the operator performs light control with visual and tactile sense. The front surface or the rear surface (front and back) of the sheet 100 can be easily grasped. Moreover, in this aspect, since the protective film 40 is peeled off when being attached to the light incident part 200 such as a window glass or after being attached, the convex part 75 is attached after being attached to the light incident part 200 such as a window glass. Does not cause the appearance to deteriorate or the visual field to be obstructed.

  As shown in FIG. 10, in an aspect in which the protective film 40 has a recess 80 or a hole 81 for indicating the front side or the rear side (front and back) of the light control sheet 100, the operator can visually and tactilely. The front surface or the rear surface (front and back) of the light control sheet 100 can be easily grasped. Moreover, in this aspect, since the protective film 40 is peeled when attached to the light incident part 200 such as a window glass or after being attached, the concave portion 80 or the protective film 40 is attached after being attached to the light incident part 200 such as a window glass. The hole 81 does not deteriorate the appearance. Moreover, in this aspect, it is not necessary to provide a recessed part or a hole in any of the heat ray absorbing layer 10 and the base material layer 20, and it is not necessary to scrape these layers. For this reason, the effect which each layer should play is not inhibited also in this mode.

  As shown in FIG. 11, in a mode in which the protective film 40 has beads 85, bubbles 86, or hollow particles 87 for indicating the front side or the back side (front and back) of the light control sheet 100, the worker can visually Thus, the front surface or the rear surface (front and back) of the light control sheet 100 can be easily grasped. Moreover, in this aspect, since the protective film 40 is peeled off when being attached to the light incident part 200 such as a window glass or after being attached, the beads 85, after being attached to the light incident part 200 such as a window glass, The bubble 86 or the hollow particle 87 does not deteriorate the appearance or obstruct the field of view.

  As shown in FIG. 12, in an aspect in which the protective film 40 has a protruding portion 90 that protrudes at a location where the heat ray absorbing layer 10 and the base material layer 20 are not provided in the surface direction, the operator can visually and tactilely sense. Thus, the front surface or the rear surface (front and back) of the light control sheet 100 can be easily grasped. Moreover, the protective film 40 can be easily peeled off from the base material layer 20 by providing such a protruding portion 90.

  As shown in FIG. 13, in an aspect in which the protective film 40 has a half-cut portion 42 and a protective film main body portion 41 that is a separate body from the half-cut portion 42, an operator can visually and tactilely The front surface or the rear surface (front and back) of the light control sheet 100 can be easily grasped.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG.

  In 2nd Embodiment, the sealing member 95 is provided in the front side of the heat ray absorption layer 10, or the rear surface side of the protective film 40 so that peeling is possible. And in 1st Embodiment, although it was the aspect which has the "mark" for the protective film 40 to show the front side or the back side of the light control sheet 100, in 2nd Embodiment, The sealing member 95, not the protective film 40, has a “mark” for indicating the front side or the rear side of the light control sheet 100.

  In the embodiment shown in FIG. 14, a seal member 95 including characters “front” indicating the front (front) side is attached to the protective film 40. Note that the seal member 95 may have simple symbols, figures, and the like instead of such characters.

  In the second embodiment, other configurations are substantially the same as those in the first embodiment. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In FIG. 14, only the protective film 40 and the seal member 95 are shown, and other layers such as the heat ray absorbing layer 10 and the base material layer 20 are not shown.

  Also in this embodiment, the same aspect as that of the first embodiment is adopted, and the same effect as that of the first embodiment can be obtained.

  According to the present embodiment, the operator can easily grasp the front side or the rear side of the light control sheet 100 visually. In the present embodiment, the seal member 95 is peeled off when being attached to the light incident part 200 such as a window glass or after being attached, so that the seal is made after being attached to the light incident part 200 such as a window glass. The member 95 does not deteriorate the appearance or obstruct the field of view.

Modification of the first embodiment and the second embodiment In the first embodiment and the second embodiment, the heat ray absorber 11 is used as the light control unit. In the embodiment and the second embodiment, a plurality of light reflecting portions 12 that reflect light and take in light on the side opposite to the light incident side can be used instead of the heat ray absorbing portion 11.

  In this modification, the portion that is the “heat ray absorbing portion 11” in the first embodiment and the second embodiment is the “light reflecting portion 12”, and the portion that is the “heat ray absorbing layer 10”. Only becomes the “light reflecting layer 10a”. FIG. 15 shows a mode in which a light reflecting portion is used instead of the heat ray absorbing portion, and corresponds to FIG.

  First, a process for manufacturing the light reflecting portion will be briefly described.

  The light reflection part 12 at least partially covered with the light transmission part 16 can carry the light transmission part 16 along the roll and reflect and / or refract sunlight similarly to the heat ray absorption part 11. It is formed by embedding a light reflecting material in the concave portion of the light transmitting portion 16 and removing excess light reflecting material with a squeegee or the like.

  As the light reflecting material described above, so-called mirror ink can be used. The mirror ink contains a highly reflective powder such as dispersed aluminum particles or silver particles and a binder resin made of a transparent resin material. As the binder resin, for example, an ultraviolet curable resin, a thermosetting resin, or the like can be used. Further, as the light reflecting material, white ink in which, for example, titanium oxide or zinc oxide powder that causes scattering reflection in the binder resin may be used. In this case, the light reflected by the light reflecting portion 12 is used. It can be scattered light. Further, colorless transparent ink may be used as the light reflecting material. In this case, the refractive index of the transparent material constituting the light transmitting portion 16 is set so that total reflection occurs at least on the upper surface of the light reflecting portion 12. On the other hand, a material having a smaller refractive index is selected.

  In the modification based on the first embodiment, the same effects as described in the first embodiment can be obtained. If only an important effect is described, the protective film 40 has a mark for indicating the front side or the rear side of the light control sheet 100. For this reason, the front and back surfaces (front and back) of the light control sheet 100 can be easily grasped visually or by touch. Other effects are also almost the same as those described in the first embodiment.

  In the modification based on the second embodiment, the same effects as described in the second embodiment can be obtained. That is, the operator can easily grasp the front side or the rear side of the light control sheet 100 visually. In the present embodiment, the seal member 95 is peeled off when being attached to the light incident part 200 such as a window glass or after being attached, so that the seal is made after being attached to the light incident part 200 such as a window glass. The member 95 does not deteriorate the appearance or obstruct the field of view.

  In addition, in this application, the light reflection part 12 should just reflect incident light, such as sunlight, and should just reflect the light more than half of incident light.

  By the way, also in this modification, the aspect which the adhesion layer 30 has a mark can also be used. Also in this case, the same effect as the modification of the first embodiment and the second embodiment can be obtained.

  Lastly, the description of the embodiments and the disclosure of the drawings described above are merely examples for explaining the invention described in the claims, and the description of the embodiments or the disclosure of the drawings described above is included. The invention described in the scope of claims is not limited by this.

10 Heat-absorbing layer (light control layer)
10a Light reflection layer (light control layer)
11 Heat ray absorption part (light control part)
12 Light reflection part (light control part)
16 Light transmission part 20 Base material layer 30 Adhesive layer 40 Protective film 41 Protective film body part 42 Half cut part 60, 60a Notch 65, 65a Rounded corner part 66, 66a Angular corner part 70, 70a Mark 75, 75a Convex part 80, 80a Concave part 81, 81a Hole part 85, 85a Bead 86, 86a Bubble 87, 87a Hollow particle 90, 90a Protrusion part 95, 95a Seal member 100 Light control sheet 200 Light incident part

Claims (4)

In the light control sheet attached to the light incident part where light enters,
A light control layer comprising: a plurality of light control units that control the light; and a light transmission unit that is provided between at least the light control units and transmits the light;
A protective film provided on the rear surface side of the light control layer,
The light control unit is provided along a predetermined direction in the plane of the light control sheet,
The light control unit shows different effects between the light irradiated from the front side and the light irradiated from the rear side,
The protective film has a mark for indicating the front side or the rear side,
The protective film has a protruding portion protruding at a location where the light control layer is not provided in the surface direction
The light control sheet, wherein the protrusion functions as the mark .   In the light control sheet attached to the light incident part where light enters,
  A light control layer comprising: a plurality of light control units that control the light; and a light transmission unit that is provided between at least the light control units and transmits the light;
  A protective film provided on the rear surface side of the light control layer,
  The light control unit is provided along a predetermined direction in the plane of the light control sheet,
  The light control unit shows different effects between the light irradiated from the front side and the light irradiated from the rear side,
  The protective film has a mark for indicating the front side or the rear side,
  The protective film has a half cut part and a protective film body part separate from the half cut part,
  The half-cut portion can be peeled off prior to the protective film main body portion, and functions as the mark. The light control unit includes a plurality of light reflecting units that reflect the light and take in the light on a side opposite to the light incident side, and / or a plurality of heat rays that absorb the heat rays when the light includes heat rays. It is an absorption part, The light control sheet of Claim 1 or 2 characterized by the above-mentioned. A light incident part for taking in light;
The light control sheet according to any one of claims 1 to 3 , provided in the light incident part,
A light incident part with a light control sheet, comprising:

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