JP2016024232A - Optical control member and building component member including optical control member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical control member capable of ensuring visibility in a certain direction even in a light shielding state as well as ensuring the visibility in all directions when no light shielding is required.SOLUTION: The optical control member includes: an optical control layer formed in a pattern including plural first regions 32 and plural second regions 34; and a control layer 40 containing a photochromic dye, which is disposed facing the optical control layer 30 being interposed by a predetermined distance therefrom. The first region 32 has higher optical transmissivity than that of the second region 34.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to an optical control member and a building member including the optical control member.

  In recent years, as an optical control member that adjusts the amount of sunlight that is taken into a room, an optical control member that includes a light shielding band containing a photochromic dye is known. The photochromic dye does not absorb visible light in the normal molecular structure, but when irradiated with light of short wavelengths such as ultraviolet rays contained in sunlight, the molecular structure of the dye changes, that is, it is colored, It is a chemical that absorbs visible light and returns to its original molecular structure when irradiation with short-wavelength light stops. The optical control member utilizes the fact that a substance that absorbs visible light functions as a light shielding material.

JP 2012-163905 A JP 2012-230219 A

  However, the optical control member has a problem that when the photochromic dye is colored, the field of view in all directions is lowered, and when the photochromic dye is not colored, the field of view can be secured only in a certain direction.

  The problem to be solved by the present invention is to provide an optical control member that can ensure visibility in a certain direction even in a light-shielded state and can ensure visibility in all directions when it is not necessary to shield light.

  An optical control member according to an embodiment includes an optical control layer having a plurality of first regions and a plurality of second regions formed in a pattern, and a photochromic dye disposed opposite to the optical control layer at a predetermined interval. The first region has higher light transmittance than the second region.

FIG. 1 is a cross-sectional view of an optical control member according to an embodiment. FIG. 2 is a cross-sectional view showing a state when sunlight is incident from the normal direction on the substrate surface of the optical control member according to the embodiment. FIG. 3 is a cross-sectional view illustrating a state when sunlight is incident from an oblique direction with respect to the substrate surface of the optical control member according to the embodiment. FIG. 4 is a graph that relatively represents the transmittance according to the observation angle from the indoor side when sunlight is incident from the normal direction with respect to the substrate surface of the optical control member according to the embodiment. The figure shown. FIG. 5: shows the graph which relatively represented the transmittance | permeability according to the observation angle from the indoor side when sunlight injects from the diagonal direction with respect to the base-material surface of the optical control member which concerns on embodiment. Figure. FIG. 6 is a cross-sectional view of a modification of the optical control member according to the embodiment. FIG. 7 is a cross-sectional view of a modification of the optical control member according to the embodiment. FIG. 8 is a cross-sectional view of a modification of the optical control member according to the embodiment. FIG. 9 is a cross-sectional view of a modification of the optical control member according to the embodiment. FIG. 10 is a cross-sectional view of a modified example of the optical control member according to the embodiment. FIG. 11 is a plan view illustrating different patterns of the optical control layer. FIG. 12 is a plan view illustrating different patterns of the optical control layer. FIG. 13 is a plan view illustrating different patterns of the optical control layer.

  Hereinafter, an optical control member according to an embodiment of the present invention will be described in detail with reference to the drawings. It should be noted that the disclosure is merely an example, and those skilled in the art can appropriately modify the gist of the invention and can be easily conceived, and are naturally included in the scope of the present invention. In addition, the drawings may be schematically represented with respect to the width, thickness, shape, and the like of each part in comparison with actual aspects for the sake of clarity of explanation, but are merely examples, and the interpretation of the present invention is not limited. It is not limited. In addition, in the present specification and each drawing, elements similar to those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description may be omitted as appropriate.

(First embodiment)
FIG. 1 is a cross-sectional view of the optical control member according to the first embodiment. As shown in FIG. 1, the optical control member 10 includes a sheet-like base material 20 having light transmittance. As the base material 20, for example, a transparent resin sheet made of polyethylene terephthalate (PET) having a thickness of 1 mm can be used. The base material 20 may be formed of a material selected from a resin member group including glass, polycarbonate, or acrylic. The substrate 20 is a plate or film material that is colorless or colored.

  The base material 20 has a flat rectangular first surface (a surface facing the indoor side) 20a and a second surface (a surface facing the outdoor side) 20b facing each other. The optical control member 10 includes an optical control layer 30 provided on the entire surface of the first surface 20a, and a photochromic dye provided on the entire surface of the second surface 20b disposed to face the optical control layer 30 at a predetermined interval. And a control layer 40.

  The optical control layer 30 includes a plurality of strip-shaped or stripe-shaped first regions 32 and a plurality of strip-shaped or strip-shaped second regions 34 that are alternately arranged in parallel, and each first region 32 is a second region 34. It has a characteristic of transmitting light more than that. The first region 32 and the second region 34 extend in parallel with each other, and extend linearly from one end edge (here, the upper end edge) of the first surface 20a to the other end edge (here, the lower end edge). ing. In other words, the first region 32 and the second region 34 are provided with uniformity and repeatability over the entire area of the first surface 20a.

  Each second region 34 is formed as a light shielding layer that mainly absorbs light. In the present embodiment, the second region 34 is formed of a material that absorbs light from ultraviolet rays of sunlight to infrared rays, for example, carbon black ink. The content and film thickness of carbon black are adjusted in each second region 34 so that light can be completely blocked (that is, the light transmittance is 0%). In the first region, each first region 32 is formed as a light transmission layer. In the present embodiment, the first region 32 is a band-shaped opening pattern, and is formed by the first surface 20 a of the substrate 20.

  In the present embodiment, the width of the first region 32 (the width in the width direction of the band) is formed to 1 mm, and the width of the second region 34 (the width in the width direction of the band) is also formed to 1 mm. . That is, the juxtaposition pitch of the plurality of first regions 32 along the direction in which the first regions 32 and the second regions 34 are alternately juxtaposed (the width direction of the band) is set to 1 mm. The optical control layer 30 may be formed by stacking a plurality of layers.

  The control layer 40 is usually light transmissive and has an optical property of being colored and absorbing light when irradiated with sunlight. When the control layer 40 is colored by being irradiated with sunlight, the control layer 40 is capable of completely blocking (absorbing) light (that is, so that the light transmittance is approximately 0%) The film thickness is adjusted. Further, in the control layer 40, when sunlight reflected from concrete or a white wall is incident, the content and film thickness of the photochromic dye are adjusted so that the degree of coloring does not hinder the visibility. . The control layer 40 is mixed and used with a plurality of types of photochromic dyes that are colored in different colors, and is adjusted to be colored black when irradiated with light having a short wavelength such as ultraviolet rays. As the photochromic dye, for example, known ones such as spirolane compounds and spirooxazine compounds can be used. The control layer 40 may be configured by laminating a plurality of layers each containing a photochromic dye. Further, a protective layer or an adhesive layer may be provided on at least one surface of the optical control member 10.

  Next, a change in the control layer 40 when sunlight enters from the first surface 20a side of the optical control member 10 will be described with reference to FIGS. FIG. 2 is a cross-sectional view showing a state when sunlight is incident on the first surface 20a of the base material 20 of the optical control member 10 from the normal direction (direction of 90 degrees), and FIG. 4 is a cross-sectional view schematically showing a state in which sunlight is incident on the first surface 20a of the base member 20 of the optical control member 10 from an oblique direction (a direction of 45 degrees). FIG. 2 and 3, the direction of the arrow is the incident direction of sunlight.

  As shown in FIG. 2, when sunlight enters perpendicularly to the first surface 20 a of the substrate 20, a part of the sunlight is shielded by the second region 34 of the optical control layer 30 and the other one is The part enters the base material 20 through the first region (opening) 32, and further passes through the base material 20 and enters the control layer 40. Thereby, each area | region which opposes the 1st area | region 32 of the optical control layer 30 among the control layers 40 is irradiated with sunlight, and is colored, and forms the several colored area | region 40a. Each colored region 40a absorbs and blocks incident sunlight. Moreover, each area | region which opposes the 2nd area | region 34 of the optical control layer 30 among the control layers 40 is not irradiated with sunlight, and forms the non-colored area | region 40b, without coloring.

  Therefore, when the optical control member 10 is observed perpendicularly from the second surface 20b side of the substrate 20, the light shielding layer (second region 34) on the first surface 20a side and the control layer 40 formed on the second surface 20b side. And the non-colored region 40b of the control layer 40 formed on the second surface 20b side and the opening (first region 32) formed on the first surface 20a side. However, they appear to overlap. When the optical control member 10 is observed perpendicularly from the first surface 20a side or the second surface 20b side of the base material 20, the second regions 34 (light-shielding layers) and the colored regions 40a of the control layer 40 are alternately formed in a strip shape. A random pattern is observed. That is, sunlight is shielded by the entire surface of the optical control member 10, and the entire surface of the optical control member 10 appears black. Thereby, the scenery of the background side of the optical control member 10 cannot be observed.

  On the other hand, when the optical control member 10 is observed obliquely from the first surface side or the second surface side of the base material, the light shielding layer (second region 34) on the first surface 20a side and the second surface 20b side are formed. The colored region 40a of the control layer 40 appears to substantially overlap, and the opening (first region 32) formed on the first surface 20a side and the non-colored region 40b on the second surface 20b side substantially overlap. Looks. Therefore, when the optical control member 10 is observed obliquely from the second surface 20b side of the substrate 20, the background side of the optical control member 10 passes through the non-colored region 40b, the substrate 20, and the first region (opening) 32. You can see the scenery. That is, light incident obliquely on the first surface 20a of the substrate 20 can be observed. This observable light is light in a wavelength region that does not change the chemical structure of the photochromic dye. Thus, the optical control member 10 can ensure visibility in a certain direction even in a light-shielded state.

  As shown in FIG. 3, when sunlight is incident on the first surface 20 a of the substrate 20 obliquely (for example, a direction inclined by 45 degrees with respect to the normal direction), a part of the sunlight is The second region 34 of the optical control layer 30 is shielded from light, and another part of the optical control layer 30 enters the substrate 20 obliquely through the first region (opening) 32 and further passes through the substrate 20 to be transmitted through the control layer. 40 is incident. As a result, areas of the control layer 40 that are substantially perpendicular to the second area (light-shielding layer) 34 of the optical control layer 30 are colored by being irradiated with sunlight, thereby forming a plurality of colored areas 40a. Each colored region 40a absorbs and blocks incident sunlight. Moreover, the area | region which opposes the 1st area | region (opening part) 32 of the optical control layer 30 among the control layers 40 is not irradiated with sunlight, and forms the non-colored area | region 40b, without coloring.

  Therefore, when the optical control member 10 is observed obliquely from the second surface 20b side of the substrate 20, the light shielding layer (second region 34) on the first surface 20a side and the control layer 40 formed on the second surface 20b side. And the non-colored region 40b of the control layer 40 formed on the second surface 20b side and the opening (first region 32) formed on the first surface 20a side. However, they appear to overlap. Thereby, when the optical control member 10 is observed obliquely from the second surface 20 side of the substrate 20, a pattern in which the second regions (light-shielding layers) 34 and the colored regions 40a are alternately arranged in a band shape is observed. . That is, sunlight is shielded by the entire surface of the optical control member 10, and the entire surface of the optical control member 10 appears black. Thereby, the scenery of the background side of the optical control member 10 cannot be observed.

  On the other hand, when the optical control member 10 is observed vertically from the first surface 20a side or the second surface 20b side of the substrate 20, the light shielding layer (second region 34) on the first surface 20a side and the second surface 20b side are arranged. The formed colored region 40a appears to substantially overlap, and the opening (first region 32) formed on the first surface 20a side and the non-colored region 40b formed on the second surface 20b side, It looks almost overlapping. Accordingly, when the optical control member 10 is observed perpendicularly from the second surface 20b side of the base material 20, the background side of the optical control member 10 passes through the non-colored region 40b, the base material 20, and the first region (opening) 32. You can see the scenery. That is, light incident perpendicularly to the first surface 20a of the substrate 20 can be observed. This observable light is light in a wavelength region that does not change the chemical structure of the photochromic dye. Thus, the optical control member 10 can ensure visibility in a certain direction even in a light-shielded state.

  In other words, according to the optical control member 10, the ultraviolet component of sunlight is utilized to block all sunlight regardless of the angle from which sunlight is irradiated, and at an observation angle different from the incident direction of sunlight. It becomes possible to see through the scenery.

  The relationship between the observation direction described above and the visibility of the scenery will be further described with reference to a graph.

  4 and 5 are graphs showing the relationship between the observation angle (observation direction) and the transmittance, and represent the visibility of the scenery when viewed from the indoor side (second surface side). The vertical axis of the graph represents the relative transmittance when the maximum transmittance of light transmitted through the optical control member 10 is 100. The horizontal axis of the graph is the observation angle. The observation angle of 0 degree or 180 degrees indicates that the observation direction is parallel to the second surface 20b of the optical control member 10, and the observation angle of 90 degrees is the observation angle. The direction is perpendicular to the second surface 20 b of the optical control member 10.

  FIG. 4 shows the relationship between the observation angle and the transmittance when sunlight enters perpendicularly to the first surface 20a of the substrate 20. As described above, when sunlight is incident on the first surface 20a of the substrate 20 perpendicularly, when the optical control member 10 is observed in the vertical direction from the second surface 20b side of the substrate 20, the relative transmittance is obtained. Becomes zero, and it is understood that the scenery on the background side of the optical control member 10 cannot be observed. When the optical control member 10 is observed in an oblique direction from the second surface 20b side of the base material 20, a background on the background side of the optical control member 10 can be observed. In the direction parallel to the optical control member 10 (0, 180 degrees), the transmittance suddenly changes to zero, but this is caused by Fresnel reflection of the optical control member 10 (incident at a low angle at the interface with different refractive indexes). The light is reflected). Basically, in the design of the embodiment, as the observation direction is changed from the direction parallel to the second surface 20b of the substrate 20 (0 degree) to the vertical direction (90 degrees), the relative transmittance of incident light is 100 to 0. To change. Further, as the observation direction is changed from the direction perpendicular to the second surface 20b of the substrate 20 (90 degrees) to the parallel direction (180 degrees), the relative transmittance of incident light changes from 0 to 100.

  FIG. 5 shows the relationship between the observation angle and the relative transmittance when sunlight enters the first surface 20a of the substrate 20 in an oblique direction (45 degrees). As described above, when sunlight is incident on the first surface 20a of the base material 20 in an oblique direction, when the optical control member 10 is observed in the vertical direction from the second surface 20b side of the base material 20, optical control is performed. The background on the background side of the member 10 can be observed, and when the optical control member 10 is observed obliquely from the second surface 20b side of the base member 20, the background on the optical control member 10 cannot be observed. . As shown in FIG. 5, the relative transmittance of incident light changes from 0 to 100 as the observation direction is changed from the direction parallel to the second surface 20 b of the substrate 20 (0 degree) to the vertical direction (90 degrees). . Further, as the observation direction is changed from the direction perpendicular to the second surface 20b of the substrate 20 (90 degrees) to the parallel direction (180 degrees), the relative transmittance of incident light changes from 100 to 0.

  In addition, by changing the thickness of the optical control member 10 and the pattern pitch of the optical control layer 30 as appropriate, the seeable angle with respect to sunlight can be changed. For example, the thickness of the optical control member 10 is doubled without changing the pattern width of the optical control layer 30, or the first region and the second region of the optical control member 10 are not changed without changing the thickness of the optical control member 10. By setting the area to 0.5 mm, the relative transmittance can be maximized at an angle slightly displaced from the incident angle of sunlight (about 45 degrees).

  In addition, as shown in FIG. 1, when it is not necessary to block sunlight with the optical control member 10, for example, when sunlight is not irradiated like nighttime, the control layer 40 does not color, but the whole area | region is colored. It is a non-colored area. Therefore, visibility in all directions can be ensured from the second surface 20 b side of the optical control member 10 through the control layer 40, the base material 20, and the second region (opening) 32.

Hereinafter, effects or advantages obtained when the optical control member 10 according to the embodiment is used will be described.
According to the optical control member 10 according to the embodiment, the control layer 40 having the photochromic dye is provided on the entire second surface of the substrate 20 and is not blocked by the optical control layer 30 formed on the first surface 20a. Sunlight is blocked by the colored region of the control layer 40. That is, sunlight is always shielded by the optical control member 10 regardless of the incident angle. In other words, in the optical control member 10 according to the embodiment, the colored region (region that blocks sunlight) of the control layer 40 is automatically displaced following the change in solar altitude. On the other hand, as described above, the scenery on the background side of the optical control member 10 passes through the non-colored region of the control layer 40 and the opening (first region 32) of the optical control layer 30 regardless of the incident angle of sunlight. Is visible. Therefore, the optical control member 10 according to the embodiment can block and block sunlight while ensuring a constant field of view regardless of changes in solar altitude with time.

  In addition, the control layer 40 of the optical control member 10 is uniformly formed on the entire second surface 20b of the substrate 20 and is not formed in a pattern. Therefore, unlike the conventional optical control member that patterns the light shielding layers on both surfaces of the substrate 20, the positions of the optical control layer 30 formed on the first surface 20a of the substrate 20 and the control layer 40 formed on the second surface 20b. Matching becomes unnecessary. The optical control layer 30 can be easily formed by, for example, screen printing.

  Optical control members with the function of automatically following the changes in the sun's altitude and blocking light are used not only for architectural windows but also for rear or side windows of automobiles, ships or airplanes that move from place to place over time. By doing so, it is possible to obtain the maximum energy saving effect while securing the field of view. Also, at night when there is no sunlight, visible light is only blocked by the light-shielding layer provided on the first surface of the base material. Visible.

  Next, optical control members according to other embodiments or modifications will be described. In other embodiments or modifications described below, the same reference numerals are given to the same portions as those of the first embodiment described above, and detailed description thereof will be omitted, and different configurations will be mainly described.

  In the optical control member 10 according to the first embodiment described above, the optical control layer 30 and the control layer 40 including the photochromic dye are formed on both surfaces of a common base material, but the present invention is not limited to this. .

(Second Embodiment)
FIG. 6 is a cross-sectional view showing an optical control member according to the second embodiment. As shown in FIG. 6, according to this embodiment, the optical control member 10 includes two base materials 20 and 50, and the optical control layer 30 and the control layer 40 are formed on separate base materials.

  The light-transmitting substrate 20 is formed in, for example, a plate shape, and has a first surface 20a and a second surface 20b that face each other with a gap. Similarly, the light-transmitting substrate 50 is formed in, for example, a plate shape, and has a first surface 50a and a second surface 50b that face each other with a gap. The base material 50 is disposed such that the first surface 50a faces the second surface 20b of the base material 20 in parallel with a predetermined gap. The base materials 20 and 50 transmit visible light and light having a short wavelength that changes the molecular structure of the photochromic dye, respectively.

  An optical control layer 30 having a first region 32 and a second region 34 is formed on the second surface 20 b of the substrate 20. The control layer 40 containing a photochromic dye is formed over the entire first surface 50a of the substrate 50 and faces the optical control layer 30 with a gap.

  Also in the case of the optical control member 10 configured as described above, the distance between the optical control layer 30 and the control layer 40 containing the photochromic dye, the thickness of each layer, the first region 32 and the second region included in the optical control layer 30. By appropriately adjusting the width, pitch, and the like of the region 34, the same effects as those of the optical control member according to the first embodiment can be obtained.

(Modification)
7, 8, and 9 are cross-sectional views showing optical control members according to first, second, and third modifications, respectively.
As shown in FIG. 7, according to the first modification, the optical control layer 30 is provided on the first surface 20 a of the substrate 20, and the control layer 40 including the photochromic dye is formed on the second surface of the substrate 50. 20b is provided.
As shown in FIG. 8, according to the second modification, the optical control layer 30 is provided on the first surface 20 a of the substrate 20, and the control layer 40 including the photochromic dye is formed on the first surface of the substrate 50. 20a is provided.

  As shown in FIG. 9, according to the third modification, the optical control layer 30 is provided on the second surface 20 b of the substrate 20, and the control layer 40 including the photochromic dye is formed on the second surface of the substrate 50. 20b is provided.

  In any of the modifications, the distance between the optical control layer 30 and the control layer 40, the thickness of each layer, the widths and pitches of the first region 32 and the second region 34 included in the optical control layer 30, and the like are appropriately adjusted. Thus, the same effect as that of the optical control member according to the first embodiment can be obtained.

(Third embodiment)
FIG. 10 is a cross-sectional view showing an optical control member according to the third embodiment. The control layer 40 containing a photochromic dye need not necessarily be formed on the surface of the transparent substrate 20. According to this embodiment, the optical control member 10 includes two base materials 20 and 50. The light-transmitting substrate 20 is formed in, for example, a plate shape, and has a first surface 20a and a second surface 20b that face each other with a gap. Similarly, the light-transmitting substrate 50 is formed in, for example, a plate shape, and has a first surface 50a and a second surface 50b that face each other with a gap. The base material 50 is disposed such that the first surface 50a faces the second surface 20b of the base material 20 in parallel with a predetermined gap. The base materials 20 and 50 transmit visible light and light having a short wavelength that changes the molecular structure of the photochromic dye, respectively.

  An optical control layer 30 having a first region 32 and a second region 34 is formed on the second surface 20 b of the substrate 20. The base material 50 includes a photochromic dye and constitutes the control layer 40. In that case, for example, the photochromic dye is added to the transparent resin and kneaded to form the base material 50.

  Also in the optical control member 10 in which the base material 50 contains a photochromic dye, the distance between the optical control layer 30 and the base material 50 containing the photochromic dye, the thickness of each layer, and the first region 32 provided in the optical control layer 30. By appropriately adjusting the width and pitch of the second region 34 and the like, the same effects as those of the optical control member according to the first embodiment can be obtained.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  In the optical control member 10 according to the above-described embodiment, the pattern of the first region 32 and the second region 34 included in the optical control layer 30 has a band shape. However, the pattern of the 1st field 32 and the 2nd field 34 with which optical control layer 30 is provided does not necessarily need to be formed in strip shape. For example, as shown in FIGS. 11 to 13, the optical control layer 30 may be a dot-like pattern.

  FIG. 11 and FIG. 12 show examples of patterns that exhibit light shielding properties in two directions, the left and right (X axis) direction and the up and down (Y axis) direction of the paper. In this case, the direction inclined by 45 degrees with respect to the X and Y axes is less light-shielding than the X and Y axes. The pattern shown in FIG. 11 and the pattern shown in FIG. 12 have different aperture ratios in the first region 32, and the settings of the transmittance of the entire optical control member 10 and the light shielding performance in the 45 degree direction are adjusted.

  FIG. 13 shows an example of a pattern that exhibits light shielding properties in all directions. While the light shielding performance is exhibited in all directions, the aperture ratio of the first region 32 is the smallest, so that the transmittance of the entire optical control member 10 is also the smallest.

  As described above, the pattern of the first region 32 and the second region 34 of the optical control layer 30 can be designed flexibly according to the application.

  Moreover, the control layer 40 may be blended with a plurality of types of photochromic dyes so as to be colored in a color other than black. Further, the photochromic dye used for the control layer 40 may be a dye that is colored by visible light. When a photochromic pigment that is colored by visible light is used for the optical control member 10, the optical control member 10 exhibits a blinding function (private prevention function) that prevents light leakage of the room light.

  Further, the shape of the transparent substrate 20 included in the optical control member 10 according to the embodiment may be a curved surface. As described above, since the control layer 40 included in the optical control member 10 according to the embodiment is uniformly formed on one surface of the transparent substrate, alignment with the optical control layer 30 is unnecessary. Therefore, in the optical control member 10 according to the embodiment, it is easy to design the optical control layer 30 for obtaining a desired light-shielding effect even if the shape of the transparent substrate 20 is a curved surface. Moreover, even if the shape of the transparent substrate 20 is a curved surface, the formation of the control layer 40 is easy.

DESCRIPTION OF SYMBOLS 10 ... Optical control member, 20, 50 ... Base material, 30 ... Optical control layer 30,
32 ... 1st field 32, 34 ... 2nd field 34,
40 ... control layer,
20a, 50a ... first surface, 20b, 50b ... second surface

Claims (9)

An optical control layer having a plurality of first regions and a plurality of second regions formed in a pattern;
A control layer comprising a photochromic dye disposed opposite to the optical control layer at a predetermined interval; and
The first region is an optical control member having a higher light transmittance than the second region. A base material having first and second surfaces facing each other and having light transmission properties;
The optical control layer is provided on the first surface,
The optical control member according to claim 1, wherein the control layer is provided on the second surface.   The said base material is a board | plate material or film material which is formed with the material chosen from the resin member group containing glass, a polycarbonate, a polyethylene terephthalate, or an acryl, and has transparency and is colorless or colored. Optical control member.   The optical control member according to any one of claims 1 to 3, wherein the first region and the second region are each formed in a band shape and are alternately arranged.   5. The optical control member according to claim 1, wherein two or more kinds of photochromic dyes are mixed in the control layer.   The optical control member according to claim 1, wherein the control layer is formed by laminating two or more layers each containing a photochromic dye.   The optical control member according to any one of claims 1 to 6, wherein a protective film is formed on a surface of at least one of the optical control layer and the control layer.   The optical control member according to any one of claims 1 to 7, wherein an adhesive film is formed on a surface of at least one of the optical control layer and the control layer.   A building member comprising the optical control member according to claim 1.

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