JP2018110749A - Anisotropic daylight curtain and curtain holder - Google Patents

Abstract

The maximum value of illuminance in a room or the like is set to 1.7 times or more of the minimum value, etc., or by arbitrarily maintaining the crease interval of a curtain, Realization of both “brightness on viewer side” and “ease of viewing images”. A curtain 1 separating a space K, and light H incident from one side Ka of the space K separated by the curtain 1 is transmitted through the curtain 1 to the other side Kb of the separated space K. By entering, the maximum value SbMAX of the spatial illuminance Sb on the other side is set to 1.7 times or more the minimum value Sbmin of the spatial illuminance Sb on the other side. The light-shielding part 2 having a predetermined visible light transmittance T and the light-transmitting part 3 having a visible light transmittance T larger than that of the light-shielding part 2 are included. The light shielding band 2 'and the light transmission band 3' whose longitudinal direction is substantially along the length direction J 'of the curtain 1 are in the width W' direction of the curtain 1. You may arrange | position repeatedly alternately along. [Selection] Figure 1

Description

  The present invention relates to a curtain separating a space and a curtain holder.

Conventionally, the interdigital curtain is known (patent document 1).
In this interdigital curtain, a large number of hollow cylindrical portions formed of a flexible sheet-like material are connected to be vertically foldable and foldable in 1 to 3 layers, and each cylindrical portion is in its axial direction. A curtain material formed as having a length of 0.5 to 3 times the width of the opening in the folded state of a single cylindrical part, and each one end of the curtain material is connected to the cylindrical part. Each curtain material is fixed in a state of being arranged in a dense manner in parallel with the upper frame so that its axis is in the horizontal direction and perpendicular to the plane on which the large number of curtain materials are arranged in parallel. Is fixed to a lower frame which can be moved up and down by an operation mechanism.

JP 2011-104168 A

However, in the interdigital curtain described in Patent Document 1, when the light passes through the curtain and enters the room through a window or the like, all the cylindrical portions have the same shape, so the light is uniform in the room. (The light entering (captured) has no direction).
Therefore, for example, if there is a screen of a TV or personal computer in the room, a screen projected by a projector, etc., darkening the screen or near the screen with the curtain will make it easier to see the image or video. There is a possibility that the hand etc. will become too dark, and conversely, if the viewer's hand is made brighter, the area near the screen will become too bright, making it difficult to view images and videos.
In addition, in the interdigital curtain of Patent Document 1 in which light is uniformly incident into the room, a portion where the light is not desired to be irradiated in the room (such as an interior member having low light resistance) is exposed to light in the same manner as other portions. For this reason, there is a problem that deterioration of interior members having low light resistance is accelerated.

  Therefore, the present invention sets the maximum value of illuminance in a room or the like to 1.7 times or more of the minimum value, or sets the visible light transmittance of the light transmitting part in the curtain to three times or more the visible light transmittance of the light shielding part. And by arbitrarily maintaining the crease spacing of the curtains, it is possible to obtain "directional light capture" and "brightness on the viewer side" and "ease of viewing images, etc." It is an object to provide a curtain and a curtain holder that can achieve both compatibility and “inhibition of deterioration of interior members” at the same time.

The curtain 1 according to the present invention is a curtain that separates a space, and light incident from one side of the space separated by the curtain passes through the curtain and enters the other side of the separated space. Thus, the first feature is that the maximum value of the illuminance on the other side caused by the light that has entered is 1.7 times or more than the minimum value of the illuminance on the other side caused by the entered light.
In the present invention, “the maximum value of the illuminance on the other side caused by the entered light is 1.7 times or more than the minimum value of the illuminance on the other side caused by the entered light” means that the other side of the space Among the illuminances measured at all positions on the side, it may mean that the largest illuminance value is 1.7 times or more of the smallest illuminance value. Of the two sets of illuminance values at the target position centered on the center front position, the larger illuminance value (that is, the largest illuminance value of the two values) is the smaller illuminance value. (That is, the smallest illuminance value of the two values) may mean that the target position is 1.7 times or more.

  A second feature of the curtain 1 according to the present invention is a curtain that separates a space, and includes a light shielding portion having a predetermined visible light transmittance, and a light transmitting portion having a visible light transmittance larger than the light shielding portion, The visible light transmittance of the light transmitting part is at least three times the visible light transmittance of the light shielding part.

  A third feature of the curtain 1 according to the present invention is that, in addition to the second feature, the light-shielding portion and the light-transmitting portion are band-shaped, and the respective light-shielding strips have longitudinal directions substantially along the length direction of the curtain. The light shielding band and the light transmission band are alternately and repeatedly disposed along the width direction of the curtain.

A fourth feature of the curtain 1 according to the present invention is a curtain that separates a space, and includes a light shielding portion having a predetermined visible light transmittance, and a light transmitting portion having a visible light transmittance larger than the light shielding portion, The light-shielding part and the light-transmitting part are a light-shielding band part and a light-transmitting band part, each having a belt-like shape and a longitudinal direction substantially along the length direction of the curtain, and at least one of the light-shielding band part and the light-transmitting band part Is disposed between the peaks and valleys of the plurality of folds repeatedly formed along the width direction of the curtain and at positions other than these peaks and valleys, and the light shielding band portion and the light transmission band portion are , And alternately arranged along the width direction of the curtain.
In the present invention, “at least one of the light-shielding band part and the light-transmitting band part is between the peaks and valleys in a plurality of folds formed repeatedly along the width direction of the curtain and at positions other than these peaks and valleys. `` Disposed in '' means that `` only the light-shielding band portion is disposed between the peaks and valleys in the plurality of folds and at positions other than these peaks and valleys '' Only the portion is disposed between the peaks and valleys of the plurality of folds and at a position other than the peaks and valleys ”and“ both the light shielding zone portion and the light transmission zone portion are the plurality of folds. It is included between the peaks and valleys in the area other than these peaks and valleys.
Furthermore, in the case where “both the light-shielding band part and the light-transmitting band part are disposed between the peaks and valleys of the plurality of folds and at positions other than these peaks and valleys”, the curtain is shielded from light. It has a portion other than the belt portion and the light-transmitting belt portion (for example, a switching portion (bending portion 12) described later), and the switching portion 12 is disposed at the positions of peaks and valleys in the plurality of folds. Means the case.

  A fifth feature of the curtain 1 according to the present invention is that, in addition to the first to third features, the curtain 1 has a holder that arbitrarily holds the intervals between a plurality of creases formed on the curtain. .

  A sixth feature of the curtain 1 according to the present invention is that, in addition to the first to fifth features, the curtain has a substantially rectangular shape, and at least one of four ends of the substantially rectangular curtain. It is in the point which has the folding part which can switch the direction which folds this edge part in an edge part.

In addition to the first to sixth features, the seventh feature of the curtain 1 according to the present invention is that the curtain located on the side opposite to the surface on which light is incident on one side of the space separated by the curtain. The surface has a portion having an L ^* value of 58 or less according to the L ^* a ^* b ^* color system according to JIS-Z-8781-4: 2013.

With these characteristics, the light H passes through the curtain 1 and enters the other side Kb of the separated space K, so that the maximum value Sb _MAX of the in-space illuminance Sb by the entered light H is Unlike the interdigital curtain of Patent Document 1, the light H uniformly enters the other side space Kb such as indoors by setting it to 1.7 times or more the minimum value Sb _min of the illuminance in the other side space. The light H is taken into the other side space Kb such as indoors with directivity by adjusting the positions where the maximum value Sb _MAX and the minimum value Sb _min in the illuminance Sb on the other side are not generated. ("Incorporation of light with directionality").
Therefore, for example, even when there is a screen or screen of a television or the like in the other side space Kb such as indoors, if the maximum value Sb _MAX and the minimum value Sb _min in the in-space illuminance Sb are adjusted, the viewer It is possible to make the image and the like easier to see by darkening the vicinity of the screen while ensuring the brightness of the side (coexistence of “brightness on the viewer side” and “ease of viewing the image”).
In addition, even if there is a portion (such as an interior member with low light resistance) that is not desired to be exposed to light in the space Kb on the other side of the room or the like, the space on the other side depends on the position of the interior member or the like. By adjusting the maximum value Sb _MAX and the minimum value Sb _min in the internal illuminance Sb, it is possible to reduce deterioration of the interior member having low light resistance (“deterioration of interior member etc.”).

Further, even if the visible light transmittance T of the light transmitting portion 3 is set to be three times or more the visible light transmittance T of the light shielding portion 2, the light H is uniformly incident on the other space Kb such as the room. If the positions of the light-shielding part 2 and the light-transmitting part 3 are adjusted, “capture of light with directionality” can be realized.
In addition to this, for example, even when there is a screen or screen of a television or the like in the space Kb on the other side such as a room, both “brightness on the viewer side” and “ease of viewing images” can be achieved. Even if there is an interior member having low light resistance in the space Kb on the other side such as a room, it is possible to realize “inhibition of deterioration of the interior member”.

  Further, the light shielding band portion 2 ′ and the light transmission band portion 3 ′ whose longitudinal direction is substantially along the length direction J ′ of the curtain 1 are alternately arranged along the width direction W ′ of the curtain 1, so that the curtain When a plurality of pleats 4 and irregularities are formed along the width direction W ′ of one, the positions of the plurality of folds 4 and the like, the light-shielding part 2 and the light-transmitting part 3 in the space Kb on the other side such as the room By adjusting, it is possible to realize “capture of light with directionality”, “brightness on the viewer side” and “ease of viewing images”, and “suppression of deterioration of interior members”.

In addition, at least one of the light-shielding band 2 ′ and the light-transmitting band 3 ′ is disposed between the peaks 4a and valleys 4b of the plurality of folds 4 and at positions other than the peaks 4a and valleys 4b. By alternately and repeatedly arranging the light-shielding band portion 2 and the light-transmitting band portion 3, the light H incident on the other side space Kb, such as the room, becomes a peak 4a of the fold 4 provided with the light-shielding band portion 2 '. While being blocked by the portion between the valleys 4b, it is possible to enter the room or the like through the portion between the ridges 4a and the valleys 4b of the fold 4 where the translucent zone 3 'is disposed. It becomes easier to realize “take-in”.
In addition to this, for example, even when placing a screen or screen of a television or the like in the space Kb on the other side of the room or the like, the side on which the screen or the like is placed is darkened and faced slightly apart from these screens. The viewer side can be brightened, and it is easy to realize both “brightness on the viewer side” and “ease of viewing images”.
In addition, by placing an interior member or the like having low light resistance on the dark side in the space Kb on the other side, such as indoors, "deterioration of interior members and the like" can be easily achieved.
The “mountain 4a of the fold 4” in the present invention means a point (vertex) that protrudes most to the space Kb on the other side of the curtain 1 (for example, the indoor side of the curtain 1). The “four valleys 4b” means a place (valley bottom) farthest from the space Kb on the other side of the curtain 1 (for example, the indoor side of the curtain 1).
On the other hand, the “peak part 4A of the fold 4” in the present invention means a part of the curtain 1 that protrudes to the space Kb on the other side and includes the above-mentioned “mountain 4a”. “4B” means a portion of the curtain 1 that is away from the space Kb on the other side and includes the above-described “valley 4b”.

  In addition, by having the holder 20 that arbitrarily holds the intervals D of the plurality of folds 4 along the width direction W ′ of the curtain 1, the positions of the light shielding portions 2 and the light transmitting portions 3 in the plurality of folds 4 can be easily achieved. Depending on the space K such as a window or a room where the curtain 1 is used, it is possible to adjust the “capture of light with directionality” as intended, “brightness on the viewer side” and “ease of viewing images, etc.” Can be realized at the same time, as well as further “inhibition of deterioration of interior components”.

Moreover, the end of the curtain 1 when used for a window or the like is provided at the end of the substantially rectangular curtain 1 formed with a plurality of folds 4 by holding the folding portion 5 that can hold the folded state. Even if the mountain 4a of the plurality of folds 4 faces the other side space Kb (the surface 1a side of the curtain 1) such as the room, the folding part 5 is placed on the one side space such as the outside or the window. By folding and folding toward Ka (the back surface 1b side of the curtain 1), it becomes possible to invert the peak 4a of the fold 4 at the end of the curtain 1 to the valley 4b, and the appearance and appearance of the curtain 1 are improved. .
Therefore, for example, even if the place of the screen or the screen of the television or personal computer changes due to the redesign in the space Kb on the other side such as the room, the ridge 4 crest 4a at the end of the curtain 1 changes to the trough 4b. The same curtain 1 can be used.

And, the surface (for example, the surface on the indoor side of the curtain 1) 1a located on the opposite side (that is, the other side Kb) of the space K of the curtain 1 has an L ^* value of 58 or less. Therefore, not only the light having a directivity into the space Kb on the other side of the room or the like but also the hue of the surface 1a on the room side or the like of the curtain 1 is “ease of viewing an image or the like”. Can be secured.

  The curtain holder 20 according to the present invention has a first feature of arbitrarily holding intervals between a plurality of creases formed on the curtain.

  By arbitrarily holding the intervals between the plurality of pleats 4 with the holder 20 with respect to the curtain 1, the curtain 1 with any configuration can be used according to the space such as a window or a room using the curtain 1. It is possible to achieve the “light-capture with directionality” as described above.

  According to the curtain and the curtain holder according to the present invention, the maximum value of the illuminance in the room or the like is set to 1.7 times or more of the minimum value, or the visible light transmittance of the light transmitting part in the curtain is set to the light shielding part. By making the visible light transmittance three times or more, etc., or by arbitrarily maintaining the curtain fold spacing, it is possible to “take in directional light”, “brightness on the viewer side” and “image” "Easy to see" etc. can be realized at the same time.

It is an outline perspective view showing the curtain concerning the present invention. It is a general | schematic plane sectional view which shows a curtain and the space of one side, the other side, etc., (a) shows the curtain whose cross-sectional view shape of a fold is an accordion shape, (b) is a cross-sectional view shape of a fold (C) shows a curtain having no folds. It is a general | schematic perspective view which shows the example of the holder in a curtain. It is a schematic plan view which shows the example of the illumination intensity in the space of the one side and the other side in a curtain. It is a schematic plan view which shows the example of the maximum value and the minimum value of the illuminance in the space on the other side of the curtain, and the measurement system in Test 1 (the other side of the light source, the curtain, and the space). It is the schematic which shows Example A of a curtain (curtain fabric), (a) shows a knitting structure, (b) shows a yarn arrangement | sequence repeat, (c) shows a thread needle row | line | column with a structure chart. It is a drawing substitute photograph which shows Example A of a curtain (curtain fabric). (A) is a schematic plan view showing the curtain and the other side of the space in Test 2, and (b) is a graph showing the result of Test 2. FIG. It is drawing substitute photograph which shows the result of Test 2, (a) shows the surface located in the other side of the space of the curtain of Comparative Examples 8 and 1-6, (b) The curtain of Comparative Examples 8 and 1-6 The screen of a television etc. when using is shown. (A) is a schematic plan view showing the curtain and the other side of the space in Test 3, and (b) is a graph showing the result of Test 3. FIG. FIG. 6 is a drawing-substituting photograph showing the results of Test 3, showing a screen of a television or the like when the curtains of Example 2 and Comparative Examples 0, 2, 7, and 8 are used and when the curtains are not used. (A) is a schematic plan view showing the curtain and the other side of the space in Test 4, and (b) is a graph showing the result of Test 4. FIG. It is a drawing substitute photograph which shows the result of Test 4, (a) shows the surface located in the other side of the space of the curtain of Example 2 and Comparative Examples 0, 8, and 9, (b) shows Examples 2 and 9 (C) shows the case of viewing the curtains of Examples 2 and 9 from the screen position, and (d) shows the curtains of Examples 2 and 9 from the viewer position. Show the case. It is a general | schematic plane sectional view which illustrates the folding part in the modification of a curtain, (a) shows the state which the edge part protruded in the near side, (b) shows the state which folded the folding part to the back side. .

<Overall configuration of curtain 1>
Embodiments of the present invention will be described below with reference to the drawings.
1 to 13 show a curtain 1 according to the present invention.

The curtain 1 separates the space K, and has a sheet-like curtain fabric 10 and may also have a light shielding part 2, a translucent part 3, a fold 4, a folding part 5, and a holder 20. .
As long as the space 1 is separated from the curtain 1, the curtain 1 may be hung from a wall surface or a ceiling, or may be configured to stand on its own in a partition shape.

In addition, the curtain 1 may be provided with a label or a curtain hook.
Here, the curtain hook is for hanging the curtain 1 by being hooked on a curtain runner or the like, and the curtain runner may be movably attached to the curtain rail Y.

The curtain rail Y, the curtain runner, etc., or the top of the curtain 1 may be covered with a curtain box.
In addition, when the curtain 1 has a self-supporting configuration, the curtain 1 may have a leg portion or a frame body that supports the curtain 1 itself.

<Length direction J 'of curtain 1 and width direction W' of curtain 1 etc.>
In the curtain 1 separating the space K in this way, a direction substantially along the vertical direction (vertical direction) is a length direction J ′, and a length in the length direction J ′ is a length J of the curtain 1.
In the curtain 1, the width direction W ′ is a direction substantially perpendicular to the length direction J ′ and substantially along the front surface 1 a and the back surface 1 b of the curtain 1, and the length in the width direction W ′ is the width of the curtain 1. W.

The shape of the curtain 1 is not particularly limited, and may be, for example, a substantially rectangular shape, or may be a substantially trapezoidal shape or an elliptical shape.
The space K separated by the curtain 1 will be described next.

<Space K, one side Ka of space K, the other side Kb of space K>
As shown in FIGS. 1 to 13, the space K is separated by the curtain 1 into one side Ka and the other side Kb.
The space K is not particularly limited as long as it is separated from the curtain 1. For example, when the curtain 1 is provided in a window (opening portion) of the room, the curtain 1 causes the “outdoor (close the window). The space between the window and the curtain 1) ”and the“ indoor side ”, and during the day, the“ outside ”is the space K where the light (sunlight etc.) H is incident. It becomes one side Ka, and “indoor side” becomes the other side Kb of the space K into which the light H enters (“outdoor” can be expressed as one side space Ka, and “indoor” can be expressed as the other side space Kb).

At night, on the contrary, the “indoor side” is the one side Ka of the space K into which light (such as light from room lighting) is incident, and the “outside” is the other side of the space K into which the light H enters. It can be said that it becomes the side Kb.
That is, “one side Ka of the space K (one side space Ka)” in the present invention means a space on the side where the light H is incident on the curtain 1 among the spaces separated by the curtain 1. In the present invention, “the other side Kb of the space K (the other side space Kb)” means a space on the side where light incident from the one side Ka of the space K passes through the curtain 1 and enters.
Therefore, it can be said that the one side Ka and the other side Kb in the space K can be relatively changed depending on conditions such as daytime or nighttime, presence / absence of illumination, brightness thereof, and the like. The one side Ka and the other side Kb in the space K may be determined only under the condition that sunlight H inserted through the window from the outside enters the space K.

In addition, when the curtain 1 is provided like a door curtain at the entrance of the room instead of the window, the curtain 1 is separated into the “outside of the room” and the “inside of the room” by the incident light H, It can be said that “outside the room” is one side Ka of the space K, and “inside the room” is the other side Kb of the space K, or vice versa.
In addition, when the curtain 1 is provided in a partition (partition or partition) shape so as to separate the inside of one room, it can be said that the space K is separated by the curtain 1 into one side Ka and the other side Kb. It can be said that the side with the light source M such as illumination or the brighter side becomes one side Ka of the space K where the light H enters, and the side without the light source M or the darker side becomes the other side Kb of the space where the light H enters. .

<Light H>
As shown in FIGS. 1 to 13, the light H enters the curtain 1 from one side Ka of the space K, passes through the curtain 1, and enters the other side Kb of the space K.
As long as it is incident / transmitted / entered in this way, the light H is not particularly limited, but may be, for example, sunlight or light from indoor lighting.
The light source M for such light H may be the sun or a light source for indoor lighting (LED, fluorescent lamp, incandescent lamp, HID, etc.).

<Curtain fabric 10>
As shown in FIGS. 1 to 13, the curtain fabric 10 is a sheet-like material serving as a base of the curtain 1.
The curtain fabric 10 is composed of the fabric constituting the curtain fabric 10 (which is the basis of the curtain fabric 10), sewing processing at the end, processing such as heat, or width joining (one curtain fabric by joining a plurality of fabrics). 10), the curtain fabric 10 is obtained for the first time.

The material of the curtain fabric 10 is not particularly limited, and for example, a knitted fabric, a woven fabric, a film, or a sheet-like product obtained by combining them may be used.
When the curtain fabric 10 is a knitted fabric, a warp knitting such as a denby knitting (tricot knitting), a raschel knitting, a double raschel knitting, a bandai knitting knitting (atlas knitting), a cord knitting, a flat knitting (tengu knitting), a rubber knitting (rib knitting) ), Weft knitting such as pearl knitting or any other structure.

When the curtain fabric 10 is a woven fabric, any woven structure may be used. For example, a plain weave, a twill weave, a satin weave, a double weave, a double weave or a multiple weave may be used.
When the curtain fabric 10 is a knitted fabric or a woven fabric, polyester fibers such as polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), and polybutylene terephthalate (PBT) are used as the fibers constituting (woven or knitted) the fabric. Polyolefin fibers such as nylon (polyamide) fiber, polyethylene (PE), polypropylene (PP), rayon fiber, cupra fiber, acetate fiber, acrylic fiber mainly composed of polyacrylonitrile (PAN), polyvinyl alcohol (PVA) Synthetic fibers such as fibers (vinylon fibers) and polyurethane (PU) fibers, and others, silk fibers, cotton fibers, hemp fibers, wool fibers, glass fibers, etc., which may be used alone or in combination. .

Further, when the curtain fabric 10 is a knitted fabric or a woven fabric, the fineness of fibers constituting (woven or knitted) them may be any value. For example, the total fineness is 20 dtex or more and 3000 dtex or less.
If the curtain fabric 10 is a sheet-like material such as a film (such as when the curtain 1 is a shower curtain, for example), the material constituting it is polyvinyl chloride (PVC) resin, polyethylene terephthalate (PET), Polyester resins such as polytrimethylene terephthalate (PTT) and polybutylene terephthalate (PBT), synthetic resins such as polyamide (PA) resin, and the like may be used alone or in combination.

The curtain fabric 10 described above may have any color tone such as red, orange, yellow, green, blue, purple, black, and white, and any saturation or brightness may be used. It does not matter if it is a value. The pattern of the curtain fabric 10 may be any pattern such as a pattern of a plant such as a flower or a plant, an animal pattern, a geometric pattern, a plain pattern, or a surface irregularity.
The curtain fabric 10 may optionally be provided with extender pigments and fillers (fillers) such as titanium oxide and calcium carbonate, deodorants, antibacterial agents, antifungal agents, flame retardants, water repellents, antifouling agents. An agent, a colorant, a fragrance, a foaming agent, and the like may be added, and the timing of application may be any before or after the curtain fabric 10 is configured (woven or knitted). Also good.

In addition, when the curtain fabric 10 is a knitted fabric or a woven fabric, the surface of the curtain fabric 10 on which light H such as sunlight is incident, that is, the surface positioned on one side Ka of the space K (for example, the chamber of the curtain fabric 10). Glossy yarn, heat shield yarn, infrared reflecting yarn is used as the yarn on the outer back surface 10b side, or the surface located on the other side Kb of the space K (for example, the interior surface of the curtain fabric 10) 10a side yarn Alternatively, a thread having a high L ^* value (lightness) may be used.
Further, when the curtain fabric 10 is a knitted fabric or a woven fabric, the light shielding, which will be described in detail later, can be made to one curtain 1 by partially changing the fineness, material, color, saturation, brightness, pattern, additive, etc. of the yarn used. The part 2 and the translucent part 3 may be formed.

<Light shielding part 2, light shielding band part 2 '>
As shown in FIGS. 1 to 7, the light shielding portion 2 is a portion having a predetermined visible light transmittance T in the curtain 1.
Such a light-shielding part 2 has a difference in visible light transmittance T from other parts in the curtain 1 because the material (whether it is a knitted fabric, a woven fabric or a film), color, pattern or the like is different. May be allowed.

In addition, when the curtain fabric 10 is a knitted fabric or a woven fabric, the light-shielding portion 2 has its structure, the material of the yarn used, the fineness, and the density (in the case of a knitted fabric or a woven fabric, the warp density or / and the weft density). May be different from each other in the curtain 1 in the visible light transmittance T.
And the number of the light shielding parts 2 in one curtain 1 may be plural or one.
In addition, when the number of the light-shielding parts 2 is one, the curtain cloth 10 whose whole is the light-shielding part 2 and another curtain cloth 10 which is the whole light-transmitting part 3 described later are sewn together. It may be formed.

Of the light shielding part 2, a band-shaped part is defined as a light shielding band part 2 ′, and the light shielding band part 2 ′ may have a longitudinal direction substantially along the length direction J ′ of the curtain 1.
Such a light-shielding band portion 2 ′ and a light-transmitting band portion 3 ′ described later may be alternately and repeatedly disposed along the width direction W ′ of the curtain 1.

In addition, the light shielding band portion 2 ′ may have a longitudinal direction substantially along the width direction W ′ of the curtain 1, and in that case, the light shielding band portion 2 ′ and a translucent band portion 3 ′ described later are used as the curtain 1. It may be alternately arranged along the length direction J ′.
In this case, at least one of the light-shielding band portion 2 ′ and the light-transmitting band portion 3 ′ is disposed at a position other than the peak 4a and the valley 4b in the fold 4 described later, and the light-shielding band portion 2 ′. The translucent band portions 3 ′ may be alternately arranged along the width direction W ′ of the curtain 1.

That is, when the curtain fabric 10 is a knitted fabric or a woven fabric, the density of the switching portion between the light shielding band portion 2 ′ and the light-transmitting band portion 3 ′ is systematically reduced, and others are included (the density of the switching portion). Are not limited to those that are organizationally low).
Furthermore, the light shielding band portion 2 ′ may have a longitudinal direction substantially along an oblique direction other than the height direction J ′ or the width direction W ′ of the curtain 1, and in that case, the light shielding band portion 2 ′ and a light transmission band described later. The light band portion 3 ′ is alternately and repeatedly disposed along the oblique direction of the curtain 1 (an oblique direction substantially orthogonal to the longitudinal direction of the light shielding band portion 2 ′).

<Translucent part 3, translucent band part 3 '>
As shown in FIGS. 1-7, the translucent part 3 is a part in the curtain 1 where the visible light transmittance T is larger than that of the light shielding part 2 described above.
The visible light transmittance T of the light transmitting portion 3 may be 3 times or more, preferably 4 times or more, more preferably 5 times or more than the visible light transmittance T of the light shielding portion 2.
Such a translucent part 3 is different in the material (whether it is a knitted fabric, a woven fabric, a film, etc.), color, pattern, etc. You may make it become 3 times or more of 2.

Further, when the curtain fabric 10 is a knitted fabric or a woven fabric, the translucent portion 3 has a structure, a material of yarn used, a fineness, and a density (if a knitted fabric or a woven fabric, a warp density or / and a weft density). ) Are different, the visible light transmittance T may be larger than that of the light shielding portion 3 or may be three times or more that of the light shielding portion 2.
And the number of the translucent parts 3 in one curtain 1 may be plural or one.
Even when the number of the light transmitting portions 3 is one, the curtain fabric 10 which is the entire light transmitting portion 3 and the other curtain fabric 10 which is the entire light shielding portion 2 described above are sewn together. May be formed.

Of the translucent part 3, a band-shaped part is defined as a translucent band part 3 ′.
Such a light-transmitting band portion 3 ′ and the above-described light-shielding band portion 2 ′ may be alternately and repeatedly disposed along the width direction W ′ of the curtain 1.

In addition, the longitudinal direction of the translucent band portion 3 ′ may be substantially along the width direction W ′ of the curtain 1, and in that case, the translucent band portion 3 ′ and the light shielding band portion 2 ′ described above are used as the curtain. 1 may be alternately and repeatedly disposed along the length direction J ′.
In this case, at least one of the light-transmitting band portion 3 ′ and the light-shielding band portion 2 ′ is disposed at a position other than the peak 4a and the valley 4b in the fold 4 described later, and the light-shielding band portion 2 ′. The translucent band portions 3 ′ may be alternately arranged along the width direction W ′ of the curtain 1 (by arranging in this way, the translucent band portions 3 ′ and the light shielding band portions 2 ′ are arranged. It is not limited that the density of the switching portion is reduced systematically).
Furthermore, the longitudinal direction of the translucent zone 3 ′ may be substantially along an oblique direction other than the height direction J ′ or the width direction W ′ of the curtain 1, and in that case, the translucent zone 3 ′ and the above-described The light-shielding band portion 2 ′ is alternately and repeatedly disposed along the oblique direction of the curtain 1 (an oblique direction substantially orthogonal to the longitudinal direction of the light-transmitting band portion 3 ′).

<Visible light transmittance T>
The visible light transmittance T in the light shielding part 2 and the light transmitting part 3 will be described below.
The “visible light” in the present invention is visible light (visible radiation) according to JIS-Z-8120: 2001. "Radiation with a short wavelength limit of 360-400 nm and a long wavelength limit of 760-830 nm".

Next, the “visible light transmittance T” in the present invention is a visible light transmittance according to JIS-Z-8120: 2001, and more specifically, “radiant flux of transmitted light or light flux Φ _t and incidence. The ratio of the radiant flux of light or the luminous flux Φ _i Φ _t / Φ _i ”, generally expressed as a percentage (%).
Here, the unit of radiant flux or luminous flux Φ _t or Φ _i is “lumen (lm)”, and the unit of illuminance “lux (lx)” is also “lumen per square meter (lm / m ² )”. The “visible light transmittance T” in the present invention may be the other-side spatial illuminance Sb to be described later ÷ one-side spatial illuminance Sa (that is, Sb / Sa).

The specific value of the visible light transmittance T of the light shielding part 2 or the light transmitting part 3 is not particularly limited as long as it is larger than the light shielding part 2 or three times or more that of the light shielding part 2, but for example, the light shielding part 2 (including the shading zone 2 ′) has a visible light transmittance T of 0.1% to 5.0%, preferably 0.2% to 4.5%, more preferably 0.5% or more. It may be 4.0% or less (0.8%, 3.7%, etc.).
The specific value of the visible light transmittance T of the light transmitting part 3 (including the light transmitting band part 3 ′) is, for example, 3.0% or more and 15.0% or less, preferably 4.0% or more and 14. It may be 0% or less, more preferably 4.5% or more and 13.5% or less (4.9%, 13.5%, etc.).
In addition, the visible light transmittance T of the light shielding part 2 (including the light shielding band part 2 ′) is 4.25% or less, and the visible light transmittance T of the light transmitting part 3 (including the light transmitting band part 3 ′). May be greater than 4.25%.

<Lead 4>
As shown in FIGS. 1 to 7, the crease 4 is a crease attached to the curtain fabric 10, and the crease 4 forms irregularities on the sheet-like curtain fabric 10 (the crease 4 is a curtain fabric). 10 can be said to be smooth unevenness (crests 4a and valleys 4b described later) of the curtain fabric 10 formed by pinching 10 or linearly bent at the crease).
Accordingly, the fold 4 also has a longitudinal direction, and the longitudinal direction of the fold 4 may be substantially along the length direction J ′ of the curtain 1, for example.

In addition, the longitudinal direction of the pleat 4 may be substantially along the height direction J ′ of the curtain 1 or may be substantially along an oblique direction other than the height direction J ′ or the width direction W ′.
The longitudinal direction of the pleat 4 may be substantially along the longitudinal direction of the light shielding band portion 2 ′ and the light transmitting band portion 3 ′ described above.

As long as the fold 4 is formed on the curtain 1, any configuration may be used. For example, at least a part of the curtain 1 (upper end portion or the like) is formed in a fold shape by sewing. Alternatively, as long as the curtain fabric 10 is made of a thermoplastic resin fiber or the like, it may be formed by heat setting as described above.
Further, although the number of the pleats 4 may be plural or one in one curtain 1, it will be described below that the pleats 4 are plural.

<Mountain 4a, valley 4b of fold 4>
As shown in FIGS. 1 to 7, the peak 4 a of the fold 4 means a point (vertex) that protrudes most to the space Kb on the other side of the curtain 1 (for example, the indoor side of the curtain 1) as described above. Since the pleat 4 has a longitudinal direction, the most projecting peak 4a continues along the longitudinal direction for a long time.
Similarly, the valley 4b of the fold 4 means the place (the valley bottom) farthest from the space Kb on the other side of the curtain 1 (for example, the indoor side of the curtain 1), and is the most along the longitudinal direction of the fold 4 The valley 4b that has moved away will continue for a long time.

<Mountain 4A, valley 4B of fold 4>
With respect to the peaks 4a and valleys 4b of the folds 4, as described above, the “peak portion 4A of the folds 4” protrudes into the space Kb on the other side of the curtain 1 and includes the above-described “mounts 4a”. It means a part with a width.
Further, “the valley 4B of the fold 4” in the present invention also means a portion of the curtain 1 that is away from the space Kb on the other side and has a predetermined area including the above “valley 4b”.

At least one of the light-shielding part 2 (particularly, the light-shielding band part 2 ′) and the light-transmitting part 3 (light-transmitting band part 3 ′) described above with respect to the peak part 4A and the valley part 4B of the fold 4 is provided. The plurality of folds 4 repeatedly formed along the width direction W ′ or the length direction J ′ of the curtain 1 are disposed between the peaks 4a and the valleys 4b and at positions other than the peaks 4a and the valleys 4b. At the same time, the light-shielding band 2 ′ and the light-transmitting band 3 ′ may be alternately arranged along the width direction W ′ of the curtain 1.
That is, at least one of the light shielding part 2 (particularly, the light shielding band part 2 ′) and the light transmitting part 3 (light transmitting band part 3 ′) is the peak at the peak part 4A, and the bottom at the valley part 4B. The light shielding part 2 and the light transmitting part 3 may be arranged on a part of the peak part 4A or the valley part 4B if they are not arranged even in the valley 4b.

The cross-sectional shapes of the ridges 4A and valleys 4B of the fold 4 are not particularly limited, and may be, for example, an accordion shape (angular) or a drape shape (curved).
The cross-sectional shape of the ridge 4A or valley 4B of the fold 4 is a plan view shape of the ridge 4A or valley 4B of the fold 4 if the longitudinal direction of the fold 4 is substantially along the length direction J ′ of the curtain 1. If the longitudinal direction of the fold 4 is substantially along the width direction W ′ of the curtain 1, the shape of the ridge 4A and the valley 4B of the fold 4 is seen from the side.

<Amplitude N of fold 4>
The amplitude (the sum of the height of the crest 4a and the depth of the trough 4b) A in the cross-sectional view shape of the fold 4 is not particularly limited, but may not be a uniform value. The amplitude N on one side in the length direction J ′ and the like and the amplitude N on the other side are set to two or more different values, or from one end side to the other end in the width direction W ′ or the length direction J ′ of the curtain 1. It may increase gradually or stepwise toward the side (in other words, gradually decrease stepwise from the other end side toward one end side).
In this way, by changing the amplitude N, the maximum value Sb _MAX of the other-side spatial illuminance described later can be set to the other-side spatial illuminance without the light-shielding unit 2 and the light-transmitting unit 3 described above. It can be said that the minimum value Sb _min can be 1.7 times or more.

Note that the amplitude N of the fold 4 may change periodically or irregularly, and conversely, it may be uniform in one curtain 1.
Further, the amplitude N of the fold 4 will be described in detail. The amplitude N is the ridge 4 uneven direction between the ridge 4a in one fold 4 and the valley 4b in the other fold 4 in two adjacent folds 4. It can also be said that the distance is (the direction perpendicular to the surface 10a of the curtain fabric 10 before the folds 4 are formed).
The amplitude N of the fold 4 may be determined at the same time as the fold 4 is formed on the curtain 1, or the amplitude N may be changed after the fold 4 is formed.

<Distance 4 of fold 4>
As shown in FIGS. 1 to 7, when there are a plurality of folds 4, the interval D between the plurality of folds 4 is not particularly limited, but is, for example, one fixed value (uniform in one curtain 1). There may be.
On the other hand, the spacing D of the folds 4 may be two or more different values. Examples of the different values are from one end side to the other end side in the width direction W ′ or the length direction J ′ of the curtain 1. May increase gradually or stepwise (in other words, gradually or stepwise decreases from the other end side toward the one end side), or may vary periodically or irregularly.

In addition, if it explains in full detail about the space | interval D of the pleats 4, it can be said that this space | interval D is the cross-sectional view distance of the crease | folds 4 of the peaks 4a (or valleys 4b) in the two adjacent folds 4. FIG.
Such a distance D between the folds 4 may be determined simultaneously with the formation of the folds 4 on the curtain 1, or may be arbitrarily held by a holder 20 described later after the formation of the folds 4.

<Holding tool 20>
As shown in FIG. 3, the holder 20 arbitrarily holds the intervals D in the plurality of folds 4 formed on the curtain 1.
The holding tool 20 may have any configuration as long as the gap D of the folds 4 can be arbitrarily held. For example, the above-described hanging curtain hook is attached to the curtain fabric 10 at a predetermined mounting interval. In this case, the connecting tool 20 that connects two adjacent curtain hooks with a connection interval narrower than the attachment interval may be used.

Such a connecting tool 20 may be a chain or a string-like object having connecting parts to curtain hooks at both ends, and the attachment interval in this case is the length of the chain or the string-like object. .
When a plurality of such connecting tools 20 are used for one curtain 1, the connecting interval of connecting each connecting tool 20 is set to one predetermined value (uniform in one curtain 1), or two or more It may be a different value or gradually or gradually increase from one end side to the other end side in the width direction W ′ or the length direction J ′ of the curtain 1 (in other words, from the other end side to the one end side) Gradually or stepwise), and may vary periodically or irregularly.

The connecting tool 20 is adjustable in its mounting interval, so that the space D such as a window or a room using the curtain 1 is once maintained at a predetermined value at a predetermined mounting interval. Depending on the space K in which the curtain 1 is used or the K is changed, the intended “capture of light with directionality”, “brightness on the viewer side” and “ease of viewing images” And further “inhibition of deterioration of interior members” can be realized.
In addition, as the holder 20, in one curtain 1, for each curtain unit having a predetermined number of folds 4 and hanging curtain hooks, the curtain hooks at both ends of the curtain unit are close to each other and separated from each other. The mechanism may be a mechanism that moves the curtain hook and adjusts the distance D between the folds 4 with an operation string or the like so that the operation string is fixed, and this mechanism is such that the operation string is fixed to one end of the curtain unit. It is good also as a structure which supports an operation string with a ring etc., follows the width direction of a curtain unit, and operates an operation string via a one-way clutch etc.

<Inside space illuminance Sb>
As shown in FIGS. 1 to 7, the in-space illuminance Sb on the other side of the space K where the light H incident from one side Ka of the space K separated by the curtain 1 passes through the curtain 1 and enters. Illuminance S on the other side Kb.
The illuminance Sb in the space on the other side is not particularly limited. For example, the distance (for example, the surface on the indoor side of the curtain 1) 1a (from the curtain 1) from the surface Kb on the other side Kb of the space K of the curtain 1 The other side distance Zb may be a value measured with an illuminometer at a position separated by a predetermined value (25 cm, 100 cm, 200 cm, etc.).

Here, if the other side distance Zb from the curtain 1 is described in detail, the other side distance Zb is a plan view from the center in the width direction W ′ on the surface 1a of the curtain 1 (or a side view from the center in the length direction J ′). Etc.).
Therefore, the other side distance Zb from the curtain 1 is not only the distance to the other side front position (the position at which the other side angle θb with respect to the curtain 1 described later is 0 °) with respect to the center of the surface 1a of the curtain 1, The distance to the other side oblique position (position where the other side angle θb is a value other than 0 °) with respect to the front surface at the center of the surface 1a is also included.

In general, it can be said that the illuminance Sb on the other side decreases as the other-side distance Zb from the curtain 1 increases at any of the other-side front position and the other-side oblique position described so far.
Further, if the other side distance Zb from the curtain 1 is substantially the same, it can be said that the value of the in-space illuminance Sb changes depending on the other side angle θb with respect to the curtain 1.

The other side angle θb with respect to the curtain 1 described above is the plane from the reference line C, with the front (for example, normal) in the center of the width direction W ′ on the surface 1a of the curtain 1 being the reference line (0 °) C. This is an angle in view (or the front in the height direction J ′ as a reference line C, and a side view from the reference line C, etc.), and the value may be 60 °, for example. In FIG. 4, the “+” direction of θb means the “left direction” from the center of the surface 1 a of the curtain 1 toward the space Kb on the other side, and the “−” direction of θb means the direction of the curtain 1. It means “right direction” from the center of the surface 1 a toward the space Kb on the other side.
The distance Zb on the other side from the curtain 1 may be a distance in the normal direction at each point from each point on the surface 1a of the curtain 1 instead of the distance from the center of the surface 1a of the curtain 1.

Here, when the case where the curtain 1 has the pleat 4 (the curtain 1 is uneven), the center of the surface 1a of the curtain 1 is a peak 4a, a valley 4b, and a peak 4a of the fold 4 depending on the uneven state. One of the three valleys 4b.
In this case, the other side distance Zb from the curtain 1 is the distance from the center of the curtain 1 regardless of the center of the surface 1a of the curtain 1 (the distance from the mountain 4a if the center of the surface 1a is the mountain 4a). If the center of the surface 1a is the valley 4b, the distance from the valley 4b may be used.

In this case, the distance Zb on the other side from the curtain 1 is the center of the surface 1a and the peak 4a and valley 4b of the fold 4 regardless of whether the center of the surface 1a of the curtain 1 is any one of the three. It is good also as a distance from the intermediate position of the fold 4 uneven | corrugated direction (direction orthogonal to the surface 10a of the curtain fabric 10 before the fold 4 is formed).
Further, in the case where the curtain 1 has the fold 4, if the other side angle θb is also described, the center of the surface 1a of the curtain 1 is any one of the ridge 4a, valley 4b, and ridge 4a and valley 4b. Although the normal direction at the center of the surface 1a is completely different depending on whether the other side angle θb in this case is one of the three at the center of the surface 1a of the curtain 1, It may be an angle in a plan view (or a side view).
Such an angle is the same at points other than the center of the surface 1a of the curtain 1, and the angle of each point on the surface 1a of the curtain 1 in a plan view (or a side view) from the concavo-convex direction of the curtain 1 The side angle θb may be used.

<Inside space illuminance Sa on one side>
The illuminance Sa in the space on one side is the illuminance S on the one side Ka of the space K where the light H enters.
In addition, the mode of the illuminance Sa in the space on one side is the same as the illuminance Sb in the space on the other side.

<Maximum value Sb _{MAX of the} illuminance in the other side space>
The maximum value Sb _MAX of the other side space illuminance may mean the highest value of the illuminance S in the other side space illuminance Sb described above.
That is, in this sense, the maximum value Sb _MAX indicates the largest value among the illuminances S measured at all positions on the other side Kb of the space K.
In addition, the maximum value Sb _{MAX of the} illuminance on the other side of the space is determined by the light that has entered the other side Kb of the space K as a target position (center of the curtain 1) centered on the other front position of the center of the curtain 1 (center of the surface 1a) Of the two sets of illuminance S values in the left and right target positions or the top and bottom target positions such as a plan view or a side view), the larger illuminance S value (that is, the largest illuminance S of the two values). In this case, the larger illuminance S value of the set of illuminance S at the target position is the maximum value Sb _{MAX of the} other side illuminance. Become.

The maximum value Sb _MAX will be described in detail. As described above, the larger the other-side distance Zb from the curtain 1, the smaller the in-space illuminance Sb. Position (the center of the surface 1a of the surface of the curtain 1) where the distance Zb on the other side from the curtain 1 is "0 (zero)" at the front position (position on the normal line) in the width direction W 'center (or the height direction J' center, etc.) The value of the illuminance S measured in step) may be the maximum value Sb _MAX .
The maximum value Sb _MAX is the same at points other than the center of the surface 1a of the curtain 1, and the other side distance Zb from each point of the surface 1a of the curtain 1 is "0 (zero)" (that is, the curtain 1 the value of the illuminance S measured at each point) on the surface 1a of, or the maximum value Sb _MAX.

Further, the maximum value Sb _MAX will be described. At a place away from the curtain 1 by the predetermined other side distance Zb, the value of the illuminance S measured at the other side front position where the other side angle θb is 0 ° is the same predetermined value. Since it is larger than the value of the illuminance S measured at the other side oblique position where the other side angle Zb is apart from the other side distance Zb and the other side angle θb is other than 0 °, It can be said that the value of the illuminance S at the front position is the maximum value Sb _MAX .
When the curtain 1 is actually used for a window (opening) in a room or the like, the front side of the other side is a surface (predetermined width) through which the light H has been transmitted straight (normally transmitted) through the window or the curtain 1. It can be said that the illuminance S is a regular transmission light surface) P, and the value of the illuminance S measured at the central position (near the central position) of the regular transmission light surface P (or a plurality of positions in the regular transmission light surface P having a predetermined width). (The average value of the illuminance S measured in step 1) may be the maximum value Sb _MAX (see FIG. 5).
When the curtain 1 is actually used for a window or the like of the room, the regular transmission light surface P is a wall surface of the room at a position where the light H is transmitted through the window or the curtain 1 or the curtain 1 straight (normal transmission). May be.

<Minimum value Sb _{min of} illuminance in the space on the other side>
On the other hand, the minimum value Sb _min in space illuminance on the other side, in the space illuminance Sb of the above-mentioned other side, may also mean value of the smallest hearing illuminance S.
That is, in this sense, the minimum value Sb _min indicates the smallest value of the illuminance S measured at all positions on the other side Kb of the space K.
In addition, the minimum value Sb _{min of the} illuminance in the space on the other side is determined by the light that has entered the other side Kb of the space K, the target position (center of the curtain 1) centered on the other front position at the center of the curtain 1 (center of the surface 1a). Of the two sets of illuminance S values in the left-right target position or the vertical target position such as a plan view or a side view), the smaller illuminance S value (that is, the smallest illuminance S of the two values). In this case, the smaller value of the illuminance S of the two sets of illuminance S at the target position is the minimum value of the illuminance in the other side to be described later. Sb _min .

The minimum value Sb _min will be described in detail. Since the other side distance Zb from the curtain 1 becomes larger (away from the curtain 1), the other-side space illuminance Sb becomes smaller, so the other side distance Zb becomes infinite ( the value of the illuminance S measured from the curtain 1 at the position of the infinity), may be the minimum value Sb _min.
When the curtain 1 is actually used for a window or the like of the room, even if the illuminance S at infinity is measured from the curtain 1, the curtain 1 is blocked by the wall of the room. (or windows) value of the illuminance S measured at the farthest position from and also said to be a minimum value Sb _min.

Further, regarding the minimum value Sb _min , as described above, the value of the illuminance S measured at the other-side front position where the other-side angle θb is 0 °, at a position away from the curtain 1 by the predetermined other-side distance Zb. Is larger than the value of illuminance S measured at the other side oblique position where the other side angle θb is other than 0 ° and separated by the same predetermined other side distance Zb. Then, it can be said that the value of the illuminance S at the other side oblique position is the minimum value Sb _min .
When the curtain 1 is actually used for a window or the like in the room, the other side oblique position is a surface (predetermined area) through which the light H diffuses or obliquely transmits (diffuses and transmits) the window or the curtain 1. Diffusive transmitted light surface) P ′, and the value of the illuminance S measured at the position farthest from the reference line C of the diffuse transmitted light surface P ′ (or in the diffuse transmitted light surface P ′ having a predetermined width). (The average value of the illuminance S measured at a plurality of positions) may be the minimum value Sb _min (see FIG. 5).
When the curtain 1 is actually used for a window or the like of the room, the diffuse transmission light surface P ′ is in the room where the light H is diffused or obliquely transmitted (diffuse transmission) through the window or the curtain 1. It may be a wall surface.

<Relationship between maximum value Sb _MAX and minimum value Sb _min of illuminance in space on the other side>
Relationship of the maximum value Sb _MAX and the minimum value Sb _min in space illuminance on the other side which has been described up to this point, the maximum value Sb _MAX · minimum Sb _min in space illuminance on the other side, the other side Kb of the space K Meaning the largest value or the smallest value of the illuminance S measured at all positions, or centering on the other front position at the center of the surface 1a of the curtain 1 by the light entering the other side Kb of the space K Of the two sets of illuminance S values at the target position, the maximum value Sb _MAX is the value of either the larger illuminance S value or the smaller illuminance S value. The minimum value Sb _min may be 1.7 times or more, preferably 2.0 times or more, more preferably 2.3 times or more, and even more preferably 2.8 times or more.
The maximum value Sb _MAX may be 4 times or more, preferably 5 times or more, more preferably 10 times or more of the minimum value Sb _min .
Furthermore, the relationship between the maximum value Sb _MAX and the minimum value Sb _min of the illuminance on the other side of the space is not particularly limited as long as the curtain 1 has the light shielding part 2 and the light transmitting part 3 described above. The maximum value Sb _MAX may be 100 lux (lx) or more, or 10 lux or more, while the minimum value Sb _min may be 40 lux or less, or 20 lux or less.
In particular, the maximum value Sb _MAX and the minimum value Sb _{min of the} illuminance in the space on the other side are the values of the larger illuminance S and the smaller one of the two sets of illuminance S values at the target position described above. In the case of the meaning of the value of the illuminance S, the maximum value Sb _MAX may be 1.7 times or more of the minimum value Sb _min , preferably 2.0 times or more, more preferably 2.3. It may be at least twice, more preferably at least 2.8 times.

<Example A of curtain fabric 10>
As an example of the curtain fabric 10 in the curtain 1 described so far, Example A composed of a knitted fabric is shown in FIGS.
As shown in FIGS. 6A to 6C and FIG. 7, the curtain fabric 10 is a single warp knitted fabric, and includes a light shielding part 2 (light shielding band part 2 ′) and a light transmitting part 3 (light transmitting part). Along with the band part 3 ′), it has a left and right ear part 11, a light-shielding band part 2 ′ and a switching part 12 for the light-transmitting band part 3 ′.

  In the curtain fabric 10 of Example A, a polyester woolly processed yarn (167 dtex 48 filament, semi-dal fiber yarn, main knitting yarn) is threaded through the first knot of a five-ply (first to fifth) warp knitting machine. In addition, the polyester woolly yarn (330 dtex 96 filament, semi-dal fiber yarn) is passed through the second rod, and the polyester wool yarn (167 dtex 72 filament, semi-dal fiber yarn) is passed through the third rod. The 4th thread is threaded with polyester woolly thread (167 dtex 72 filament, semi-dal fiber thread), and the 5th thread is cationic dyeable polyester wool thread thread (167 dtex 48 filament, semi-dal fiber thread). Thread the yarn and make the knitting structure by the first heel 1-0 / 0- 1 / ... (chain structure). -0 / 2-2 / ... (insertion structure), the knitting structure according to the third ridge is 0-0 / 4-4 / ... (insertion structure), and the knitting structure according to the fourth ridge is 4-4 / 0. This is a warp knitted fabric (warp knitted fabric) knitted as −0 /... (Inserted structure) and the knitted structure of the fifth ridge as 4-4 / 0-0 /.

Among these ridges, the light shielding band portion 2 ′ is knitted with the knitting structure of the first, third, and fifth ridges, and in particular, the surface 2a ′ of the light shielding band portion 2 ′ is knitted with the knitting structure of the fifth ridge. The back surface 2b ′ of the light shielding band 2 ′ (the surface on the one side Ka of the space K where the light H such as sunlight is incident) is knitted with the knitting structure of the third ridge.
Similarly, the translucent band portion 3 ′ is knitted with the knitted structure of the first, third, and fourth ribs. In particular, the surface 3a ′ of the translucent band portion 3 ′ is knitted with the knitted structure of the fourth ribs, and the third The back surface 3b ′ of the translucent zone 3 ′ (the surface of the one side Ka of the space K into which the light H such as sunlight is incident) is knitted by the knitting structure.
The light-shielding band portion 2 ′ and the light-transmitting band portion 3 ′ knitted in this way are alternately and repeatedly arranged along the width direction W ′ of the curtain fabric 10 (curtain 1). It is substantially along the length direction J ′.

In addition, the ear part 11 is also knitted by the knitting structure of the first, third, and fourth ribs. In particular, the surface 11a of the ear part 11 is knitted by the knitting structure of the fourth hook and the ear part is knitted by the third knitting structure. 11, a back surface 11b (a surface on one side Ka of a space K on which light H such as sunlight is incident) is knitted.
Further, the switching unit 12 is knitted with the knitting structure of the second rod.

The number of yarns passed through in one repeating unit (one repeat) of each part 2 ′, 3 ′, 11, 12 thus knitted will be described.
The shading band portion 2 ′ has 77 yarns passed through the first rod, 74 yarns passed through the third rod (threads to the right of the shading belt portion 2 ′), and 74 yarns passed through the fifth rod. One repeating unit is knitted with the book (thread passing to the left of the shading band portion 2 ').
The translucent zone 3 ′ has 77 yarns passed through the first kite, 74 yarns passed through the third kite (threads passed to the right of the translucent zone 3 ′), and yarn passed through the fourth kite. Are 74 (thread passing to the left of the translucent zone 3 ′) and one repeating unit is knitted.

In addition, the ear part 11 has 19 threads passed through the first hook on both the left and right sides (two threads are put on the end side as the curtain fabric 0 in each ear section 11 (two threads)), and the third hook 74 yarns (threaded to the right of the ear part 11) and 74 yarns (threaded to the left of the ear part 11) passed through the fourth heel, one repeating unit is knitted.
Each switching unit 12 has seven yarns passed through the second kite (two yarns are inserted at the end of the portion located on the left side of each switching unit 12 (two yarns passing), and are located on the right side of each switching unit 12. One repeating unit is knitted by putting two into the second needle from the end of the portion (two threads).
The switching unit 12 can be said to have a lower density (warp density) as a knitted structure than the other light-shielding band unit 2 ′, translucent band unit 3 ′, and ear unit 11. When bent by processing or the like, the bent portion 12 is formed.
In addition, it can be said that such a bending part (switching part) 12 is contained in the translucent part 3 from the low density (warp density) as a knitted structure. When the bent portion (switching portion) 12 is included in the light transmitting portion 3, the bent portion (switching portion) 12 is disposed at the positions of the peaks 4 a and valleys 4 b in the plurality of folds 4. Is disposed between the peaks 4a and valleys 4b of the plurality of folds 4 and at positions other than these peaks 4a and valleys 4b.

In addition, the number of yarns passed through each kite will be described.
The number of yarns to be passed through the first kite is 19 at the left ear 11, and each portion (main body) is a combination of the light-shielding band 2 ′ and the light-transmitting band 3 ′ with 7 repeats each (total 14 repeats). 1 repeat 77 lines x 14 = 1078 lines, 19 in the right ear part 11, a total of 1116 lines.
The number of yarns passed through the second kite is 1 repeat 7 × 15 = 105 each.
The number of yarns to be passed through the third kite is 15 at the left ear 11, and each portion (main body) is a combination of the light-shielding band 2 ′ and the light-transmitting band 3 ′ with 7 repeats each (total 14 repeats). One repeat is 74 pieces × 14 = 1036 pieces, and the right ear portion 11 is 15 pieces in total, ie, 1066 pieces.
The number of yarns to be passed through the fourth kite is 15 for the left ear 11, and the translucent zone 3 ′ is 7 repeats each for 74 repeats × 7 = 518, and 15 for the right ear 11. The total is 548.
The number of yarns to be passed through the fifth kite is 74 for each repeat of the light-shielding band portion 2 ′ for 7 repeats × 7 = 518.
The number of needles through which the entire warp knitting machine having the first to fifth hooks passes is 18 in the left ear portion 11, and 7 for each of the light-shielding band 2 'and the light-transmitting band 3'. In total (14 repeats) each (main body), 1 repeat is 77 × 14 = 1078, and the right ear 11 is 18 in total, 1114.

<Tests 1 to 4>
From here, the Examples 1-3 of the curtain 1 which concerns on this invention, and Comparative Examples 1-10 are mentioned first.
Using Examples 1 to 3 and Comparative Examples 1 to 10, tests 1 to 4 described later are performed.

<Example 1>
Polyester yarn (167 dtex 48 filament, semi-dal fiber yarn) and cationic dyeable polyester yarn (167 dtex 48 filament, semi-dal fiber yarn) are warp yarns, 22 wal / inch in the wal direction and 44 course / inch in the course direction A raschel knitted fabric having a density and a basis weight of 352 / m ² and having a light shielding band portion 2 ′ and a light transmission band portion 3 ′ was knitted as a curtain fabric 10. The yarn for knitting the curtain fabric 10 is 82% polyester yarn and 18% cationic dyeable polyester yarn.
In the curtain fabric 10 knitted in this way, the light-shielding band 2 'is knitted with polyester yarn and cationic dyeable polyester yarn, and the light-transmitting band 3' is knitted only with polyester yarn. The band portions 3 ′ are each 9 cm in width and are alternately and repeatedly arranged along the width direction W ′ of the curtain fabric 10 (curtain 1). Each longitudinal direction is substantially the length direction J ′ of the curtain 1. Along.
A plurality of pleats 4 are repeatedly formed along the width direction W ′ of the curtain 1 by, for example, a set process so that the curtain fabric 10 is bent in an accordion shape at the switching portion between the light shielding band portion 2 ′ and the light transmission band portion 3 ′. Thus, the curtain 1 of Example 1 was obtained.

<Example 2>
The shading band 2 'of the curtain 1 is made of cotton yarn (20th single fiber yarn) with warps and wefts, and has a density of 236 pieces / 10 cm in the warp and weft directions and a fabric weight of 154 / m ² . Weaving with. The L ^* value (also referred to as lightness, hereinafter referred to as “L ^* value”) according to the L ^* a ^* b ^* color system according to JIS-Z-8781-4: 2013 is 34.98. Then, the same a ^* value (hereinafter simply referred to as “a ^* value”) was 1.49, and the similar b ^* value (hereinafter simply referred to as “b ^* value”) was −3.80.
On the other hand, the translucent zone 3 ′ of the curtain 1 is made of polyester yarn (84 dtex 36 filament, semi-dal fiber yarn) as warp, polyester yarn (84 dtex 30 filament, semi-dal fiber yarn) as weft, and 380 in the warp direction. / 10 cm, the yarn density of 460 present / 10 cm in the weft direction, woven textile having a basis weight of 80 / m ^2. Of the yarns that weave the woven fabric of the translucent zone 3 ′, 45% are polyester yarns of 84 dtex36 filaments and 55% are polyester yarns of 84 dtex30 filaments.
The light-shielding band 2 'and the light-transmitting band 3' woven in this way are each 10 cm in width and are alternately and repeatedly arranged along the width direction W 'of the curtain fabric 10 (curtain 1). A plurality of pleats 4 are repeatedly formed along the width direction W ′ of the curtain 1 so that the longitudinal direction of the curtain 1 is connected substantially along the length direction J ′ of the curtain 1 and is bent in an accordion shape at the connected portion. The curtain 1 of Example 2 was obtained.

<Example 3>
Polyester yarn (167 dtex 48 filament, semidal fiber yarn) and polyester yarn (330 dtex 96 filament, semidal fiber yarn) warp yarn, yarn density of 19 course / inch in the wal direction and 35 course / inch in the course direction A 263 / m ² raschel knitted fabric was knitted as the curtain fabric 10. The yarn for knitting the curtain fabric 10 is 26% polyester yarn of 167 dtex and 74% is polyester yarn of 330 dtex.
The curtain fabric 10 knitted in this manner is repeatedly formed along the width direction W ′ of the curtain 1 by a set process or the like so as to bend into an accordion shape for each predetermined width. The curtain 1 of Example 3 was obtained by holding the distance D in a gradually changed state.

<Comparative Example 1>
Cotton yarn (fiber yarn of No. 20 single yarn) was used as warp and weft, and woven fabric having a yarn density of 236/10 cm in the warp and weft directions and a basis weight of 154 / m ² was woven as curtain fabric. The curtain fabric was dyed so that the L ^* value was 15.45, the a ^* value was 1.38, and the b ^* value was −1.53.
The curtain fabric woven in this way was not formed with pleats 4 and the flat curtain of Comparative Example 1 was obtained.

<Comparative example 2>
In the curtain of Comparative Example 1, the flat curtain of Comparative Example 2 is dyed so that the L ^* value is 34.98, the a ^* value is 1.49, and the b ^* value is −3.80. Got.

<Comparative Example 3>
In the curtain of Comparative Example 1, the flat shape of Comparative Example 3 was obtained by dyeing so that the L ^* value was 47.80, the a ^* value was −1.04, and the b ^* value was −9.16. Got a curtain.

<Comparative example 4>
In the curtain of Comparative Example 1, the flat curtain of Comparative Example 4 is dyed so that the L ^* value is 59.86, the a ^* value is −5.22 and the b ^* value is −12.05. Got.

<Comparative Example 5>
In the curtain of Comparative Example 1, the flat curtain of Comparative Example 5 is dyed so that the L ^* value is 56.52, the a ^* value is 1.19, and the b ^* value is −1.69. Got.

<Comparative Example 6>
In the curtain of Comparative Example 1, the flat shape of Comparative Example 6 is obtained by dyeing so that the L ^* value is 74.29, the a ^* value is −0.11, and the b ^* value is −2.25. Got a curtain.

<Comparative Example 7>
Polyester yarn (84 dtex 36 filament, semidal fiber yarn) is used as warp, and polyester yarn (84 dtex 30 filament, semidal fiber yarn) is used as weft yarn. A fabric with a basis weight of 80 / m ² was woven as a curtain fabric. Of the yarns that weave the curtain fabric, 45% are polyester yarns with 84 dtex 36 filaments and 55% are polyester yarns with 84 dtex 30 filaments.
The curtain fabric woven in this way was not formed with pleats 4 and a flat curtain of Comparative 71 was obtained.

<Comparative Example 8>
Polyester yarn (50 dtex 144 filament, bright fiber yarn) is used as warp, and polyester yarn (50 dtex 36 filament, bright fiber yarn) is used as weft. The yarn density is 841/10 cm in the warp direction and 413/10 cm in the weft direction. A fabric with a basis weight of 86 / m ² was woven as a curtain fabric. Of the yarns that weave the curtain fabric, 68% are polyester yarns of 50 dtex 144 filaments and 32% are polyester yarns of 50 dtex 36 filaments.
The curtain fabric woven in this way was not formed with pleats 4 and a flat curtain of Comparative Example 8 was obtained.

<Comparative Example 9>
In the curtain of Example 3, the curtain of Comparative Example 9 was obtained by setting the interval between the plurality of folds to one predetermined value (uniform).

<Comparative Example 10>
In the curtain of Example 3, the curtain of Comparative Example 10 was obtained by setting the crease 4 in an extended state without bending.

Part of the L ^* value, a ^* value, b ^* value, visible light transmittance T, diffusion value E, and daylighting diffusion value GE in Examples 1 to 3 and Comparative Examples 1 to 10 described so far have been described above. Are summarized in Table 1 below.

Here, the diffusion value E statistically processed the illuminance at one point in the range of 15 ° ≦ | θ | ≦ 75 ° or the illuminance at a plurality of points in the range of 15 ° ≦ | θ | ≦ 75 °. Either one of the values was statistically processed for illuminance at one point in the range of 0 ° ≦ | θ | ≦ 5 ° or illuminance at multiple points in the range of 0 ° ≦ | θ | ≦ 5 ° It may be a value divided by any one of the values.
Or, the diffusion value E is statistically the illuminance at one point in the range where only diffused light transmitted through the test object reaches or the illuminance at multiple points in the range where only diffused light transmitted through the test object reaches Either one of the values processed in the above, the illuminance at one point in the range where the light that has passed through the test object and has not diffused, or a plurality of ranges in which the light that has passed through the test object but has not diffused reaches It may be a value obtained by dividing the illuminance at the point by one of the statistically processed values.
As a more specific value, for example, a value obtained by dividing the illuminance at a point where θ is 60 ° by the illuminance at a point where θ is 0 ° may be used as the diffusion value E.
Note that the above-mentioned θ is the front (for example, normal line) in the center in the width direction on the surface of the curtain as a reference line (0 °) C, and is a plan view from the reference line C (or the front in the height direction J ′ center). Is a reference line C, and an angle in a side view from the reference line C).

The daylighting diffusion value GE is a value obtained by multiplying the daylighting value G and the diffusion value E.
Note that the daylighting value G is a value obtained by integrating the illuminance at a plurality of points by θ, and the illuminance integrated value based on the illuminance in the state where the test object is present, in the state where the test object is not present. As a more specific value, for example, an illuminance value from 0 ° to 60 ° and an illuminance at a point where θ is 90 ° are set to 0 lux (lx The value obtained by integrating the illuminance from 0 ° to 90 ° with the integrated illuminance value was divided by the integrated illuminance value when the test object was not installed. The value may be the daylighting value G.

<Test 1>
In Test 1, the illuminance S was measured with the following measurement system X for the curtains of Examples 1 to 3 and Comparative Examples 1 to 10 described above and when the curtain was not used (hereinafter referred to as “Comparative Example 0”). The results are shown in Tables 2-4.
Table 2 is the raw data of the illuminance S (lux (lx)) of each of Examples 1 to 10 and Comparative Examples 0 to 10, and Table 3 is the raw data of the illuminance S of Table 2 in the center of the curtain. Of the two sets of illuminance values at the target position centered on the front position (that is, the reference line C), the larger illuminance value (maximum value Sb _MAX ) is changed to the smaller illuminance value (minimum value). Sb _min ) is shown, and Table 4 shows the average value (lux (lx)) of the illuminance S for each of the regular transmitted light surface P and the left and right diffused transmitted light surfaces P ′, and the left and right diffusions. Of the illuminance values of the transmitted light surface P ′, the larger illuminance value (maximum value Sb _MAX ) is divided by the smaller illuminance value (minimum value Sb _min ).

Here, as shown in FIG. 5, the measurement system X in Test 1 includes a box (housing) B and a light source M accommodated in the box B, and one side surface of the box B (curtain mounting described later) In the center of the side surface B ′, an opening Q having a rectangular shape (square shape or the like) is formed. The entire inner wall of the box B may be black so that the light emitted from the light source M is reflected from the box B as much as possible.
The light source M may be, for example, an LED, a fluorescent lamp, an incandescent lamp, an HID, or the like as long as it irradiates the light H. Or white light. The light source M is a box whose optical axis M ′ is orthogonal to the curtain mounting side B ′ and the center of the opening Q (the intersection of the diagonals of the opening Q such as a square shape) and passes through the center of the opening Q. It arrange | positions in B and irradiates light toward the opening part Q whole.
Examples 1 to 3 and Comparative Examples 0 to 10 described above are attached so as to cover the opening Q of the box B, and the light H emitted from the light source M is opened from one side of the curtain (or the opening Q). It enters the curtain or the like with the size of the portion Q, and transmits to the other side of the curtain or the like. Such a configuration of the measurement system X creates a situation in which the light H is inserted into a window or the like, enters a curtain or the like, and is transmitted therethrough.
Therefore, in the test 1, the inside of the box B is “one side Ka of the space K” and the outside of the box B (because the light H passes through the curtain and the like and goes out of the box B) is “the space K”. The other side Kb ". Note that a hood F may be provided on the curtain mounting side B ′ side of the box B so as to protrude from the curtain mounting side B ′ in order to suppress excessive diffusion of the light H.
In this way, the light H emitted outside the box B (the other side Kb of the space K) is a predetermined range (for example, a plane) between the regular transmission light surface P and the diffuse transmission light surface P ′ separated by a predetermined other side distance Zb. Visually, the illuminance is measured at a predetermined distance (for example, 10 cm) from the reference line C to the left by 100 cm and to the right by 100 cm.
In addition, the opening Q of the box B in Test 1 is, for example, a square shape of 66 cm square (length and width 66 cm), and the distance from the light source M to the curtain (or opening Q) is, for example, 200 cm. Alternatively, the distance from the opening Q) to the regular transmitted light surface P and the diffuse transmitted light surface P ′ may be, for example, 100 cm, and the protrusion width of the hood F may be, for example, 30 cm.

<Evaluation of Test 1>
Of Tables 2 to 4, Table 2 will be described first.
The largest value of the illuminance S at each position in each Example / Comparative Example in Table 2 is the vicinity of the reference line C in all Comparative Examples 0 to 10 (10 cm from the reference line C to the left and 10 cm to the right in plan view) The range of between 10 cm) is the largest.
On the other hand, especially in Examples 1 and 2, the value of the illuminance S at the position 20 cm to the right from the reference line C is the largest, and even in the regular transmitted light surface P that is not so far from the reference line C. It can be said that Examples 1 and 2 are different from all Comparative Examples 0 to 10 in that the center at which the illuminance S is maximized (takes light in the intended direction).
On the other hand, the smallest value of the illuminance S at each position in each example and comparative example in Table 2 is the smallest at the position 100 cm to the right from the reference line C in all comparative examples 0 to 10. In addition, there is no large difference from the value at the position of 100 cm to the left from the reference line C.
Further, in Table 2, there are many values at each position of Examples and Comparative Examples having different values of illuminance S, in addition to the target position 100 cm to the left and right from the reference line C.

Therefore, as shown in Table 3, the quotient obtained by dividing the larger value by the smaller value among the two sets of illuminance values at the left and right target positions in Table 2 was calculated.
As a result, in Comparative Examples 0 and 2-9, the quotient is almost “1.10” and there is almost no difference between the left and right.
Further, in Comparative Examples 1 and 10, although there are positions where the quotient is “1.28” or “1.60”, they are in the regular transmission light plane P, and a normal curtain that captures light directly in front of the curtain. Or the same as when the curtain is not used (that is, light is not taken in the intended direction), and the quotient thereof is at most “1.10” in the diffuse transmission surface P ′. Since it does not exceed, it is not possible to realize the “capture of light with directionality” as intended.
However, in Examples 1 and 2, the quotient between the left and right diffused and transmitted light surfaces P ′ is all “1.70” or more. In Example 3, the quotient is “1. 78 ”, and the intentional illuminance S difference is produced in addition to the regular transmitted light surface P (directly in front of the curtain 1). It can be said that it is possible to achieve the “capture of light that has been given”.
In particular, in Example 1, the quotient from 40 cm to 100 cm on the left and right from the reference line C exceeds “1.70”, and the quotient at the position 90 cm to the left and right is “2.47”. If the curtain 1 is used, the illuminance S (brightness) of the left diffuse transmitted light surface P ′ is intentionally reduced while the illuminance S of the right diffuse transmitted light surface P ′ is suppressed (darkened). It becomes possible.
Furthermore, in Example 2, the quotient from the reference line C to the left and right 50 cm to 100 cm is “1.70” or more, and the quotient at the position 100 cm to the left and right is “2.99”. Even if the curtain 1 is used, the illuminance S (brightness) of the left diffuse transmitted light surface P ′ is intentionally suppressed, while the illuminance S of the right diffuse transmitted light surface P ′ is suppressed (darkened). Is possible.
In Example 3, the quotient of the target position 50 cm to the left and right from the reference line C is “1.78”. Therefore, if the position is 50 cm to the left and right from the reference line C, the left illuminance S (brightness) ) Can be suppressed (darkened) while the right illuminance S is suppressed.

Finally, as shown in Table 4, in Comparative Examples 0 to 10, the quotient at the left and right diffusely transmitted light surfaces P ′ is around “1.05” and does not exceed “1.09” of Comparative Example 9 at most. .
However, all of Examples 1 to 3 have a quotient exceeding “1.10”. In particular, Examples 1 and 2 have very high quotients of “2.30” and “2.19”. The plane P ′ is regarded as a plane having a predetermined area, and an intended difference can be given to the right and left illuminance S (brightness and darkness). By including the interior member, etc., it is possible to achieve both “brightness on the viewer side” and “ease of viewing images” and further “suppress deterioration of the interior member”.

<Test 2>
In Test 2, among the examples and comparative examples described above, the visible light transmittance T is measured for the curtains of Comparative Examples 1 to 6 and 8, and the curtain reflection evaluation on the screen of a television or the like is performed. The results are shown in Table 5, FIG. 8 (b), and FIG.
This test 2 was carried out on July 21, 2016 on the window of a room in a general house in Shiga Prefecture, in which only Comparative Example 8 was overlapped (Comparative Examples 1 and 8, Comparative Examples 2 and 8, ..., Comparative Example 6). 8), a curtain was used, and a television for taking a picture was placed at a distance of about 200 cm from the curtain in the room to the television screen.
As shown in FIG. 8 (a), when the sun rays H enter the room through the curtains of Comparative Examples 1 to 6 and 8, the position is separated from the curtain surface by 25 cm (hereinafter referred to as “viewing position”). ), The value of the illuminance S is measured, and the visible light transmittance T is calculated by dividing the value by the value of the illuminance S measured on the curtain outer side (window glass side).
The weather on the day of Test 2 was clear, and the value of the illuminance S outside the curtain was 10,000 lux (lx).

In addition, the grades in Table 5 are scales of reflection evaluation (sensory evaluation), and the explanation for each grade is “6th grade: I can't feel the reflection”, “5th grade: I can feel the reflection. "I don't care at all", "4th grade: I feel the reflection but I don't care", "3rd grade: I feel a little anxious", "2nd grade: I'm worried about the reflection", "1st grade: "I am very interested in the reflection."
In addition, the vertical axis of the graph of FIG. 8B is the magnitude of the reflection evaluation, the horizontal axis is the measured visible light transmittance T, and a curve approximated logarithmically for these grades and the visible light transmittance T is shown. Has been.
Further, FIG. 9 shows a photograph of a screen of a television or the like when each comparative example is used.

<Evaluation of Test 2>
As shown in Table 5, FIG. 8B, and FIG. 9, the equation of the logarithm approximate curve in the reflection evaluation and the visible light transmittance T is “y = −2.175ln (x) +5.7151”. Since the correlation coefficient (the square of the correlation coefficient) is “R ² = 0.99921,” there is a very strong correlation between the reflection evaluation and the visible light transmittance T.
That is, the lower the visible light transmittance T in the curtain (particularly, the above-described light-shielding portion 2 that is a part of the curtain), the better the evaluation of the reflection evaluation.
If it is assumed that “3rd grade or higher” is passed and “2nd grade or lower” is rejected in this reflection evaluation, there is a boundary between the two grades that passes from pass to fail.
Here, when the reflection evaluation is “grade 3”, the visible light transmittance T is “3.00%”, and when the reflection evaluation is “grade 2”, the visible light transmittance T is “5.50%”. Therefore, between these “3.00%” and “5.50%”, there is a boundary value (upper limit value) of the visible light transmittance T at which the reflection evaluation is rejected.
This upper limit value is an intermediate value “4.25%” between “3.00%” and “5.50%”, or can be said to be “4.00%”, which is a little more strict.
In this way, by setting the visible light transmittance T of the light shielding part 2 or the like that is a part of the curtain to be “4.25%” or less or “4.00%” or less, the light shielding part 2 can be used for a television or the like. Even if it is suitable for the screen side, it is possible to realize “reduction in reflection on images”.

Even if the curtain has a portion other than the light shielding portion 2 (such as the light transmitting portion 3), the visible light transmittance of the light transmitting portion 3 is a curtain even if it is a normal light transmitting portion 3. If T is high, it will be around “22%”, and if low, it will be around “13%” (see Table 1).
At this time, in consideration of the upper limit value “4.25%” or “4.00%” or less of the visible light transmittance T of the light shielding unit 2 or the like described above, the visible light transmittance T of the light transmitting unit 3 is the light shielding property. If the visible light transmittance T of the part 2 is three times or more, even if both the light shielding part 2 and the light transmitting part 3 are provided in one curtain, “reduction of reflection in an image or the like” can be realized. I can say that.

<Test 3>
In Test 3, as shown in FIG. 10A, among the above-described Examples and Comparative Examples, the curtains of Example 2, Comparative Examples 2, 7, and 8 and Comparative Example 0 were passed over these curtains. When the sunlight H enters the room at a distance of 100 cm from the surface of the curtain or the like (hereinafter referred to as “front position”), and the distance from the screen of the television or the like in the room (indoor) is 0 cm. Measure the value of illuminance S at three locations: a position (hereinafter referred to as “screen position”) and an extension line connecting the screen position to the front position and 80 cm from the front position (hereinafter referred to as “viewer position”). At the same time, sensory evaluation of curtains on the screen of a TV or the like and indoor brightness (brightness at the viewer position) was performed.
The results are shown in Table 6, FIG. 10 (b), and FIG.
This test 3 was carried out on July 29, 2016, using the curtains of the examples and comparative examples for the windows of the rooms in ordinary houses in Shiga Prefecture, just like test 2, and from the curtains in the room to the TV screen. The distance was about 200cm, and a TV for taking pictures was placed.
In addition, the weather on the day of Test 3 was clear, and a white room was placed outside this room. The illuminance S value at a height of 100 cm from the floor is measured at the screen position, the illuminance S value at the surface of the floor is measured at the front position, and the illuminance S at a height of 45 cm from the floor is measured at the viewer position. The value was measured.
Further, the interval D of the folds 4 in the second embodiment is adjusted so that the translucent part 3 cannot be seen when viewed from the screen position.

The sensory evaluation results in Table 6 show the reflection and room brightness as “◯◯”, “◯”, “×”, “XX”, and each evaluation “◯” or higher was regarded as acceptable.
In the graph of FIG. 10B, the illuminance S value of each example and comparative example at each measurement position is logarithmically displayed as a bar graph.
FIG. 11 shows a photograph taken of a screen of a television or the like when using each of the examples and comparative examples.

<Evaluation of Test 3>
As shown in Table 6, FIG. 10 (b), and FIG. 11, in Comparative Examples 0, 2, 7, and 8, both the reflection and the room brightness do not pass “◯” or more.
Specifically, when the curtain of Comparative Example 0 is not used, the room brightness is “XX”, but the reflection is “X”, and in Comparative Example 2, the reflection is “XX”. Although the room brightness is “XX” in Comparative Example 7, the room brightness is “XX”, but the reflection is “X”, and in Comparative Example 8, the room brightness is “◯”. However, the reflection is “x”, and either the reflection or the room brightness is always rejected.
However, in Example 2, since the reflection is “◯” and the room brightness is also “O”, both “brightness on the viewer side” and “reduction in reflection on images” can be achieved. realizable.

<Test 4>
In test 4, as shown in FIG. 12 (a), among the above-described examples and comparative examples, the curtains of Example 2, Comparative Examples 8 and 9 and Comparative Example 0 were compared with the sun through these curtains. The position of the screen of a television or the like in the room (indoor) along the direction orthogonal to the normal direction of the surface of the curtain or the like when the light beam H enters the room by a distance of 100 cm (hereinafter referred to as the normal direction). And the value of the illuminance S is measured at two positions 250 cm away from the screen position along the direction perpendicular to the normal line (hereinafter referred to as “viewer position”). The results are shown in Table 7, FIG. 12 (b), and FIG.
In test 4, on September 15, 2016, the curtains of the examples and comparative examples were used for the windows of the rooms in ordinary houses in Shiga prefecture as in tests 2 and 3.
In the graph of FIG. 12B, the attenuation rate of the value of the illuminance S of each of the examples and the comparative examples with respect to the value of the illuminance S when the curtain of the comparative example 0 is not used is shown by a bar graph.
FIG. 13 shows a photograph of a screen of a television or the like when using each of the examples and comparative examples.

<Evaluation of Test 4>
As shown in Table 7, FIG. 12B, and FIG. 13, in Example 2, the attenuation rate at the viewer position is not much different from that in Comparative Examples 8 and 9, but the attenuation rate at the screen position is comparative. It can be seen that it is significantly larger than Examples 8 and 9.
In other words, by using the curtain 1 of Example 2, it is possible to darken the vicinity of the screen position of a television or the like without darkening the room so much. It can be seen that it is possible to achieve both “reduction of reflection in images”.

<Comprehensive evaluation>
In addition to the evaluation of “reduction in reflection on images” and “brightness on the viewer side” mentioned in the above tests 2 to 4, a light source (LED spotlight, etc.) is passed through the curtains of the examples and comparative examples. ) Evaluation of glare when watching (so-called “light source glare reduction”), and (1) “reduction of reflection in images” and (2) “brightness of viewer side” (3) About comprehensive evaluation which put together "reduction of glare of a light source", the result with respect to Example 1, 2 and Comparative Examples 1-9 is shown in the following Table 8 among the Example and the comparative example mentioned above.
The evaluation results of (1) to (3) are indicated by “XXX”, “XXX”, “◯”, “×”, “XX”, “XXX”, and each evaluation “ "The above was accepted.
In addition, the worst evaluation among the evaluations (1) to (3) was set as a comprehensive evaluation.

<Summary of Tests 2 to 4>
As shown in Table 8, Comparative Examples 1 to 9 are: (1) “Reduction in reflection on image” and (2) “Brightness on viewer side” and (3) “Reduction in glare of light source” All of the evaluations of "" will not pass "○" or more at the same time.
However, in Examples 1 and 2, since all the evaluations (1) to (3) passed “◯” or more at the same time, “reduction of reflection in images and the like” and “brightness on the viewer side” 3 ”and“ reducing the glare of the light source ”can be realized simultaneously.

<Modification of curtain 1>
The curtain 1 that achieves the “directed light capture” as intended, as described above, is introduced into a general household, and it can be applied to the screen of a TV or personal computer without making the room too dark. In order to suppress the reflection of the screen, the same curtain may be used even if the location of the TV or PC changes due to redesign of the room.
A modification of the curtain 1 that can be handled in this way is shown below.

As shown in FIG. 14, as a modified example of the curtain 1, when the crease 4 is formed on the curtain 1, the fold 4 is bent by having a fold portion 5, an eyelet 21, and the like described later ( The bending direction of each fold 4 may be reversed with the peak 4a, valley 4b, or peak 4A or valley 4B) as a boundary.
Moreover, the curtain 1 is good also as a structure which can be used (both front and back) with the front and back reversed.

<Folding part 5>
As shown in FIG. 14, when the curtain 1 has a substantially rectangular shape, the folding portion 5 has this end portion attached to at least one of the four end portions of the substantially rectangular curtain 1. This is the part where the folding direction can be switched.
Therefore, the folding part 5 is provided with folds 5a substantially parallel to the four end parts of the curtain 1, and the folds 5a can be folded to the front surface 1a side of the curtain 1 or vice versa. The folding direction may be switched.

The folding part 5 may have a fastening member 5b such as a button or a hook-and-loop fastener that fastens the folding part 5 and its front surface 1a or back surface 1b when folded to the front surface 1a or back surface 1b side of the curtain 1. .
In the case where the curtain 1 can cope with the same curtain by, for example, reversing the bending direction of the fold 4 by the eyelet 21 or the like which will be described later, the end part (folding part 5) in the curtain 1 is Even if it is in a state of protruding toward the front (front surface 1a) (see FIG. 14A), this protruding folding part 5 is located on the back side (the window side or back surface 1b when used for a window). By folding, the projecting direction of the end of the curtain 1 can be changed to the back (window side, etc.) (see FIG. 14 (b)), and the projecting direction can be aligned with the other end. The aesthetics of the curtain 1 can be improved.

<Eyelet 21 etc.>
As shown in FIG. 14, the eyelets 21 are provided at predetermined intervals on the top of the curtain 1, passed through the rod-shaped curtain rail Y, and the curtain 1 is suspended.
Such a grommet 21 can reverse the peaks 4a and valleys 4b in the fold 4 of the curtain 1 by reversing the direction of passing through the curtain rail Y.
Instead of the eyelet 21, a crest 4 a and a valley 4 b of the fold 4 may be inverted by attaching a rotatable curtain hook or curtain runner to the upper part of the curtain 1.

<Others>
In addition, this invention is not limited to embodiment mentioned above. Each structure of the curtain 1, the holder 20, etc., or the overall structure, shape, dimensions, and the like can be appropriately changed in accordance with the spirit of the present invention.
The curtain 1 is formed of a uniform curtain fabric 10 that does not have the light shielding part 2 and the light transmitting part 3 by setting the interval D and the amplitude N of the folds 4 in the one curtain 1 to two or more different values. However, the maximum value Sb _{MAX of the} illuminance on the other side is 1.7 times or more the minimum value Sb _min .

Moreover, although the space | interval D and the amplitude N of the pleat 4 are one value (uniform), the curtain 1 changes the structure of a knitted fabric or a woven fabric when the curtain fabric 10 is a knitted fabric or a woven fabric. In addition, a curtain having a maximum value Sb _{MAX of the} illuminance in the space on the other side that is 1.7 times or more of the minimum value Sb _min is included by making the tissues different on the way.
Further, the curtain 1 includes a curtain in which one light shielding portion 2 and one light transmitting portion 3 are combined by sewing or the like.
The curtain 1 may not have the holder 20.

Further, the curtain 1 has a bright surface portion 22 having a predetermined lightness (L ^* value), or a reflectance R on a surface of one side Ka of a space K in which light H such as sunlight is incident has a predetermined reflectivity R. It may be a value.
The bright surface portion 22 and the reflectance R will be described below.

<Light surface portion 22>
As shown in FIG. 2 and the like, the bright surface portion 22 is a surface of the curtain 1 (the surface 1a or the surface on the indoor side) located on the side opposite to the one side Ka of the space K (that is, the other side Kb of the space K). Etc.) in which the L ^* value (lightness) according to L ^* a ^* b ^* color system according to JIS-Z-8781-4: 2013 is 58 or less.
The bright surface portion 22 may be provided on the entire surface (the surface 1a and the like) of the other side Kb of the space K of the curtain 1, but only a part of the surface of the other side Kb of the space K (for example, a light shielding portion). 2 only on the surface of the other side Kb of the space K).
Such a bright surface portion 22 not only captures light with directionality into the space Kb on the other side of the room, but also the hue of the surface 1a of the curtain 1 such as the room side. "Easy to see" etc., and "Reduction of reflection on the screen" can be achieved.

<Reflectance R of the surface on one side Ka of space K>
The curtain 1 may have a reflectance R of 60% or more on a surface (a back surface 1b or a window-side surface) on which the light H is incident from one side Ka of the space K.
Thus, when the reflectance R of the surface (back surface 1b, etc.) on which the light H of the curtain 1 is incident is 60% or more, the direction toward the other side Kb (inner side surface, etc.) of the space K In addition to taking in the light H having the property, the heat shielding property by reflection of the light H such as sunlight is improved.

This reflectance R is a weight coefficient shown in the range of wavelength λ of 300 nm to 2500 nm in Appendix Table 2 according to JIS-R-3106: 1998, using a spectrophotometer according to JIS-K-5602: 2008. Means the solar reflectance R calculated using.
The reflectance R in Examples 1 and 2 and Comparative Examples 1 to 9 described above is shown in Table 9 below.
The reflectance R in Example 2 and Comparative Examples 1 to 9 is the value of the surface (back surface 1b, etc.) on one side Ka of the space K, or the value of the surface (surface 1a, etc.) on the other side Kb of the space K. It doesn't matter if it exists.

The curtain of the present invention is not only used for a window or an opening of a room, but if the space can be separated by this curtain, any part such as a door curtain or a partition (partition or partition) can be separated. Can also be used.
If the curtain holder of the present invention is a curtain having folds, it can be used so as to arbitrarily hold the fold intervals regardless of whether the folds are accordion-shaped or draped.

DESCRIPTION OF SYMBOLS 1 Curtain 2 Light-shielding part 2 'Light-shielding band part 3 Light-transmitting part 3' Light-transmitting-band part 4 Fold 4a Fold mountain 4b Fold valley 5 Folding part 20 Holding tool K space Ka One side (one side space)
The other side of Kb space (space on the other side)
H Light Sb Illuminance in space on the other side Sb _MAX Maximum value in space on the other side Sb _min Minimum value in space on the other side T Visible light transmittance J 'Curtain length direction W' Curtain width direction D Multiple Fold distance

Claims (8)

A curtain that separates the space,
The light incident from one side of the space separated by the curtain passes through the curtain and enters the other side of the separated space.
The curtain characterized in that the maximum value of the illuminance on the other side of the space due to the light that has entered is 1.7 times or more the minimum value of the illuminance on the other side of the space due to the light that has entered. A curtain that separates the space,
A light shielding portion having a predetermined visible light transmittance, and a light transmitting portion having a visible light transmittance larger than the light shielding portion,
The curtain characterized in that the visible light transmittance of the light transmitting portion is three times or more the visible light transmittance of the light shielding portion. The light-shielding part and the light-transmitting part are a light-shielding band part and a light-transmitting band part, each having a belt-like shape and the longitudinal direction of which is substantially along the length direction of the curtain,
The curtain according to claim 2, wherein the light-shielding band part and the light-transmitting band part are alternately and repeatedly disposed along the width direction of the curtain. A curtain that separates the space,
A light shielding portion having a predetermined visible light transmittance, and a light transmitting portion having a visible light transmittance larger than the light shielding portion,
The light-shielding part and the light-transmitting part are a light-shielding band part and a light-transmitting band part, each having a belt-like shape and the longitudinal direction of which is substantially along the length direction of the curtain,
At least one of the light-shielding band part and the light-transmitting band part is disposed between the peaks and valleys of the plurality of folds repeatedly formed along the width direction of the curtain and at positions other than the peaks and valleys. And
The said light-shielding belt | band | zone part and the translucent belt | band | zone part are arrange | positioned alternately along the width direction of the said curtain, The curtain characterized by the above-mentioned.   The curtain according to any one of claims 1 to 4, further comprising a holding tool for arbitrarily holding intervals between a plurality of folds formed on the curtain. The curtain is substantially rectangular,
6. The device according to claim 1, further comprising: a folding portion capable of switching a direction in which the end portion is folded at at least one end portion of the four end portions of the substantially rectangular curtain. Curtain according to item. In accordance with the L ^* a ^* b ^* color system according to JIS-Z-8781-4: 2013, the surface of the curtain located on the side opposite to the surface on which light is incident on one side of the space separated by the curtain The curtain according to any one of claims 1 to 6, further comprising a portion having an L ^* value of 58 or less.   A holding tool for arbitrarily holding intervals between a plurality of folds formed on a curtain.