JP2016031808A - Light guide member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light guide member which suppresses the attenuation of guided light while effectively suppressing that the light takes on hue.SOLUTION: A light guide member 12 includes an axial shaft member 20 having an inner face 21 defining a light guide path 28 which guides light. The inner face 21 of the shaft member 20 includes a first reflection area 22 which reflects light with a wave length of 600 nm in a higher reflectance than light with a wave length of 450 nm, and a second reflection area 23 which reflects light with a wave length of 450 nm in a higher reflectance than light with a wave length of 600 nm.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a light guide member that guides light, and more particularly, to a light guide member that suppresses a color of light to be guided.

  For example, as disclosed in Patent Document 1, a light guide member is used to collect sunlight and guide the light into the room. The optical duct as a light guide member shown in Patent Document 1 has a reflective film formed on the inner surface thereof, and repeatedly reflects the captured sunlight to guide it into the room. Typically, in order to suppress reflection loss due to repeated reflection of sunlight as much as possible, a reflective film is formed on the inner surface of the optical duct by evaporating a highly reflective metal such as aluminum or silver.

  A reflective film on which a metal such as aluminum or silver is vapor-deposited has a different reflectance depending on the wavelength of light. For this reason, when sunlight repeatedly reflects in the light duct, light of a specific wavelength is greatly attenuated, and the guided light is gradually colored. Therefore, in order to suppress the color of the guided light from being tinted, the conventional optical duct performs color correction of the reflected light by laminating a colored layer on the reflective film (Patent Document 1 and Patent Document 2).

JP 2012-94394 A JP 2008-304795 A

  However, the incident angle of sunlight entering the light duct varies depending on the season and time zone. When the incident angle of the sunlight entering the optical duct varies, the length of the optical path through which the sunlight that is repeatedly reflected in the optical duct passes through the colored layer also varies. For this reason, there is a difference in the color correction effect depending on the incident angle of sunlight entering the light duct, and color unevenness tends to occur in the light guided into the room.

  In this regard, it is also conceivable to adjust the absorption spectrum of the colored layer and the extent to which the colored layer absorbs light in order to suppress the occurrence of uneven color in the light guided into the room. However, the cause of uneven color in the light guided into the room is due to fluctuations in the length of the optical path that passes through the colored layer. Therefore, even if such adjustment is performed, attenuation of the guided light is suppressed. However, it cannot effectively suppress the light from being colored.

  In addition, laminating a colored layer on the reflective film formed on the inner surface of the optical duct is not preferable because it causes an increase in processing cost and material cost due to the addition of a manufacturing process.

  The present invention has been made in consideration of the above points, and provides a light guide member that effectively suppresses tinting of the light while suppressing attenuation of the light guided. Objective.

  The light guide member according to the present invention includes a shaft-shaped shaft member having an inner surface that defines a light guide path that guides light, and the inner surface of the shaft member has a higher reflectance of light having a wavelength of 600 nm than light having a wavelength of 450 nm. And a second reflection region that reflects light having a wavelength of 450 nm with a higher reflectance than light having a wavelength of 600 nm.

  In the light guide member according to the present invention, a first reflection region formed circumferentially on the inner surface of the shaft member and a second reflection region formed circumferentially on the inner surface of the shaft member include an axis of the shaft member. They may be arranged side by side in the direction.

  In the light guide member according to the present invention, the first reflection region and the second reflection region may be alternately arranged in the axial direction of the shaft member.

  In the light guide member according to the present invention, on the inner surface of the shaft member, a first reflection region and a second reflection region that are disposed to face each other in one direction orthogonal to the axial direction of the shaft member, and the shaft member At least another first reflection region and a second reflection region that are arranged to face each other in a direction orthogonal to the axial direction and intersecting the one direction may be formed.

  In the light guide member according to the present invention, the inner surface of the shaft member is orthogonal to the first surface and the second surface disposed to face one direction orthogonal to the axial direction of the shaft member, and to the axial direction of the shaft member. And a third surface and a fourth surface disposed to face each other in a direction intersecting the one direction, and each of the first surface, the second surface, the third surface, and the fourth surface. The first reflection area and the second reflection area may be formed.

In the light guide member according to the present invention, the material forming the first reflective region includes a silver component,
The material forming the second reflective region may include an aluminum component.

  In the light guide member according to the present invention, a ratio between an area exposed to the light guide path of the first reflection region and an area exposed to the light guide path of the second reflection region may be changeable. .

  The light guide member according to the present invention further includes a hollow movable member provided so as to be movable in the axial direction of the shaft member with respect to the shaft member in the light guide path, and the hollow movable member includes: A reflection region that opens in the axial direction of the shaft member and reflects light is formed on the inner surface of the hollow movable member, and the movable member is moved along the axial direction with respect to the shaft member. Depending on the position, the range in which the movable member covers the first reflection area and the second reflection area may change.

  In the light guide member according to the present invention, the reflection region formed on the inner surface of the movable member includes a third reflection region that reflects light having a wavelength of 600 nm with a higher reflectance than light having a wavelength of 450 nm, and light having a wavelength of 600 nm. And a fourth reflection region that reflects light having a wavelength of 450 nm with a high reflectance.

  According to the present invention, the first reflection region in which the inner surface of the shaft member reflects light having a relatively large wavelength with a high reflectance, and the second reflection region in which light having a relatively low wavelength is reflected with a high reflectance. Therefore, it is possible to suppress a large attenuation of light of a specific wavelength while suppressing a reflection loss of light that repeats reflection in the light guide. As a result, it is possible to effectively suppress the light from being tinted while suppressing the attenuation of the guided light.

The figure which shows typically the building where the light guide member by one embodiment of this invention was attached. The perspective view which shows typically the light guide member attached to the building shown in FIG. A graph showing a so-called color matching function. The graph which shows the relationship between a wavelength and a reflectance for every metal material. It is a figure corresponding to FIG. 2, Comprising: The schematic perspective view which shows typically the modification of a light guide member. It is a figure corresponding to FIG. 2, Comprising: The schematic perspective view which shows typically the another modification of a light guide member. It is a figure corresponding to FIG. 2, Comprising: The schematic perspective view which shows typically another modification of a light guide member. It is a figure corresponding to FIG. 2, Comprising: The schematic perspective view which shows typically another modification of a light guide member. It is a figure corresponding to FIG. 2, Comprising: The schematic perspective view which shows typically another modification of a light guide member. It is a figure corresponding to FIG. 2, Comprising: The schematic perspective view which shows typically the modification of a shaft member. Sectional drawing which shows the cross section of the light guide member along line XX shown in FIG. It is a figure corresponding to FIG. 2, Comprising: The schematic perspective view which shows typically the example in which the movable member was further provided in the shaft member. Sectional drawing which shows the cross section of the light guide member along line XIII-XIII shown in FIG. FIG. 14 is a cross-sectional view corresponding to FIG. 13 for explaining the operation of the light guide member. FIG. 14 is a cross-sectional view corresponding to FIG. 13 for explaining the operation of the light guide member. In the light guide member which concerns on an Example and a comparative example, the graph which shows the grade to which the light of each wavelength attenuate | damps when the light guided is reflected 6 times by the inner surface of a shaft member. The light guide member which concerns on an Example and a comparative example WHEREIN: The graph which shows the grade to which the light of each wavelength attenuate | damps when the light guided is reflected 12 times by the inner surface of a shaft member.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual product. 1 to 4 are diagrams for explaining an embodiment according to the present invention. Among these, FIG. 1 is a diagram schematically showing a building 1 to which a sunlight lighting system 10 having a light guide member 12 is attached.

A sunlight lighting system 10 having a light guide member 12 is attached to a building 1 for taking sunlight and guiding it to a predetermined space, for example, a room 2. The daylighting system 10 further includes a daylighting member 11 that takes in sunlight, and the sunlight taken into the daylighting member 11 is guided to the room 2 by the light guide member 12. According to the sunlight lighting system 10, the light collected by the lighting member 11 can be guided to the room 2 via the light guide member 12, and can be used as, for example, indoor illumination light. That is, by using the solar lighting system 10, energy saving can be directly realized, and it can contribute to the reduction of CO ₂ . Hereinafter, each component will be described.

  The daylighting member 11 is provided in order to adjust the light path of sunlight whose incident direction varies depending on the season and time zone and to guide it to the light guide member 12. The daylighting member 11 is installed on the roof 5 or the wall 3 of the building 1. In the example shown in FIG. 1, the daylighting member 11 is fitted in an opening provided in the roof 5 of the building 1. A specific example of the daylighting member 11 is a so-called prism sheet or louver sheet. The prism sheet is a sheet in which a large number of prisms that deflect incident sunlight toward the light guide member 12 are arranged. The louver sheet is a sheet having a large number of refractive index interfaces or reflecting surfaces arranged in a certain direction in the sheet and selectively exerting an optical action on the sunlight according to the incident direction of sunlight. For example, sunlight from the sun located at a relatively high altitude is transmitted between adjacent refractive index interfaces or reflecting surfaces, and travels toward the light guide member 12 while maintaining its traveling direction. On the other hand, the sunlight from the sun located at a relatively low altitude is changed in the traveling direction at the refractive index interface or the reflecting surface and travels toward the light guide member 12. Since the daylighting member 11 that adjusts the optical path of sunlight according to such a change in the incident direction is well known to those skilled in the art, further detailed description thereof is omitted here.

  Next, the light guide member 12 that guides sunlight taken in by the daylighting member 11 will be described. The light guide member 12 is for guiding incident light to a predetermined space such as the room 2. In the example illustrated in FIG. 1, the light guide member 12 extends from the roof 5 of the building 1 to the ceiling 4 that partitions the room 2. A daylighting member 11 provided on the roof 5 is connected to an end of the light guide member 12 on the light incident side, and sunlight taken in by the daylighting member 11 passes through the light guide member 12 to the room 2. It has come to be guided.

  FIG. 2 schematically shows the light guide member 12. As shown in FIG. 2, the light guide member 12 has a hollow shaft member 20 extending along the axial direction d1. The inner surface 21 of the hollow shaft member 20 is formed as a reflective surface having a high reflectance. Therefore, a light guide path 28 that guides light by repeatedly reflecting light is defined in a space surrounded by the inner surface 21. That is, the shaft member 20 refers to a hollow member that extends along the axial direction d1 and has an inner surface 21 that defines a light guide path 28 that guides light. Typically, the shaft member 20 can be configured as an optical duct made of a hollow cylindrical member.

Typically, the highly reflective material forming the inner surface 21 of the shaft member 20 reflects light of each wavelength with a specific reflectance corresponding to the wavelength. For this reason, when a reflecting surface made of a single material is formed on the inner surface 21 of the shaft member 20, the light is repeatedly reflected in the light guide path 28, so that light of a specific wavelength is greatly attenuated and guided. There is a risk that the light emitted will gradually become tinted. Accordingly, in order to suppress the light guided in the light guide path 28 from being colored, the inner surface 21 of the shaft member 20 of the present embodiment reflects light having a relatively large wavelength with a high reflectance. And a second reflection region 23 that reflects light having a relatively low wavelength with a high reflectivity. According to such a form, the light which repeats reflection within the light guide path 28 is reflected in a balanced manner by the first reflection region 22 and the second reflection region 23, thereby suppressing the light having a specific wavelength from being greatly attenuated. be able to. As a result, it is possible to effectively suppress the light from being tinted while suppressing the attenuation of the guided light.

  FIG. 3 is a graph in which the wavelength and sensitivity for determining the color matching function, that is, the tristimulus values X, Y, and Z are investigated. The vertical axis of FIG. 3 shows the sensitivity of the human eye, and the horizontal axis shows the wavelength of light. As understood from FIG. 3, the color matching function X (λ) has a peak at a wavelength of 600 nm, and the color matching function Z (λ) has a peak at a wavelength of 450 nm. Therefore, it can be approximated that the reflectance at a wavelength of 600 nm is equal to the change rate of the stimulus value X and the reflectance at a wavelength of 450 nm is equal to the change rate of the stimulus value Z. Considering this point, the first reflection region 22 is a region that reflects light having a wavelength of 600 nm with a higher reflectance than light having a wavelength of 450 nm, and the second reflection region 23 is light having a wavelength of 450 nm than light having a wavelength of 600 nm. The region reflects light with high reflectivity. In this case, when white light is reflected by the first reflection region 22, it becomes easy to be reddish, and when white light is reflected by the second reflection region 23, it becomes easy to be bluish. That is, by selecting the first reflection region 22 and the second reflection region 23 as described above, the first reflection region 22 and the second reflection region 22 can be obtained from the redness or blueness of the light emitted from the light guide member 12 to the room 2. It is possible to determine the degree of adjusting the two reflection areas 23. Therefore, by selecting the first reflection region 22 and the second reflection region 23 as described above, the first reflection region 22 and the second reflection region 23 can be easily adjusted.

  In addition, the reflectance of the light of each wavelength can be measured using a reflection type spectroscope. Since the method of measuring the reflectance of light of each wavelength using a reflection type spectrometer is well known to those skilled in the art, detailed description thereof is omitted here. In the case of measuring more accurately, it is preferable to measure and average the incident angle with respect to the reflection region while changing within the actual range.

  Returning to FIG. 2, in the present embodiment, the first reflection region 22 and the second reflection region 23 are arranged side by side along the axial direction d <b> 1 of the shaft member 20. In the illustrated example, one first reflection region 22 and one second reflection region 23 are adjacent to each other in the axial direction d1. The first reflection region 22 is formed in a circumferential shape on the inner surface 21 of the shaft member 20 and surrounds the light guide path 28 in the light incident side region of the shaft member 20. The second reflection region 23 is formed in a circumferential shape on the inner surface 21 in the axial direction d1 and surrounds the light guide path 28 in the region on the light output side of the shaft member 20.

  In the example shown in FIG. 2, the inner surface 21 of the shaft member 20 has a first surface 21 a and a second surface 21 b disposed so as to face one direction d2 orthogonal to the axial direction d1, and one orthogonal to the axial direction d1. More specifically, it includes a third surface 21c and a fourth surface 21d that are disposed to face each other in the direction d2, which is orthogonal to the other direction d3. Therefore, the inner surface 21 constituted by the first surface 21a to the fourth surface 21d has a rectangular outline in more detail than a polygon in a cross section orthogonal to the axial direction d1. And the 1st reflective area | region 22 is formed in the area | region used as the light-incidence side of each 1st surface 21a-4th surface 21d, and the 2nd reflective area | region 23 is the light emission side of each 1st surface 21a-4th surface 21d. It is formed in the area. Therefore, the first reflection region 22 covers the entire region on the light incident side of the inner surface 21 of the shaft member 20, and the second reflection region 23 covers the entire region on the light output side of the inner surface 21 of the shaft member 20. ing. Note that the shape of the contour of the inner surface 21 of the shaft member 20 is not limited to such an example, and may be circular or elliptical.

  Next, the material forming the first reflection region 22 and the second reflection region 23 will be described with reference to FIG. FIG. 4 is a graph showing the relationship between wavelength and reflectance for each metal material. As understood from the graph shown in FIG. 4, gold and silver reflect light having a wavelength of 600 nm with a higher reflectance than light having a wavelength of 450 nm. Therefore, a material containing gold or silver as a main component can be adopted as the material constituting the first reflective region 22. The material containing gold or silver as a main component here includes not only a material made of gold or silver but also a material made of a compound containing gold as a component.

  In contrast, aluminum reflects light having a wavelength of 450 nm with a higher reflectance than light having a wavelength of 600 nm. Therefore, a material containing aluminum as a main component can be adopted as the material constituting the second reflective region 23. Here, the material containing aluminum as a main component includes not only a material made of aluminum but also a material made of a compound containing aluminum as a component. As an example, the first reflection region 22 and the second reflection region 23 are obtained by evaporating a target material on the inner surface 21 of the shaft member 20. However, such a formation method of the first reflection region 22 and the second reflection region 23 is an example, and other formation methods can be adopted as long as a desired reflectance can be achieved. For example, a coating material containing a metal material may be coated on the inner surface 21 of the shaft member 20. Moreover, the material which makes the 1st reflective area | region 22 and the 2nd reflective area | region 23 may be the material which mixed several metal material. Alternatively, a high reflectivity dielectric may be formed on the inner surface 21 of the shaft member 20 as a single layer film or a multilayer film.

  In particular, it has been found that it is preferable to satisfy the following conditions from the viewpoint of effectively suppressing light passing through the light guide path 28 from being colored. As a premise, the reflectance of light having a wavelength of 450 nm in the first reflecting region 22 is R1 (450), the reflectance of light having a wavelength of 600 nm in the first reflecting region 22 is R1 (600), and the wavelength of the second reflecting region 23 is assumed. The reflectance of light having a wavelength of 450 nm is R2 (450), and the reflectance of light having a wavelength of 600 nm in the second reflection region 23 is R2 (600). Further, light that is intended to suppress color unevenness is reflected N1 times in the first reflection region 22 in the light guide path 28, reflected N2 times in the second reflection region 23, and passes through the light guide path 28. To do.

にて示される。ここで、或る波長の光の導光効率とは、対象となる波長の光が導光路２８に入射したときの光量に対する、当該光が導光路２８から出射したときの光量の割合をいう。 At this time, among the light that has passed through the light guide path 28, the light guide efficiency C (450) of light having a wavelength of 450 nm is:

It is indicated by. Here, the light guide efficiency of light of a certain wavelength refers to the ratio of the light quantity when the light emitted from the light guide path 28 to the light quantity when the light of the target wavelength enters the light guide path 28.

にて示される。
なお、導光効率Ｃ（４５０）やＣ（６００）は、導光路に太陽光もしくは同等の光源光を入射し、入射端と出射端で当該波長における光束を測定し、その比をとることで求められる。 Similarly, the light guide efficiency C (600) of light having a wavelength of 600 nm among the light passing through the light guide path 28 is:

It is indicated by.
The light guide efficiency C (450) or C (600) is obtained by making sunlight or an equivalent light source light incident on the light guide path, measuring the light flux at the incident end and the exit end, and taking the ratio. Desired.

したがって、色ムラを抑制することを意図された光が式（３）を満たすように、第１反射領域２２及び第２反射領域２３の分布を調整することが好ましい。 In order to effectively suppress the light passing through the light guide path 28 from being tinted, it is preferable that C (450) = C (600).

Therefore, it is preferable to adjust the distribution of the first reflection region 22 and the second reflection region 23 so that the light intended to suppress color unevenness satisfies the expression (3).

  By the way, in the present embodiment, the length L1 of the first reflection region 22 along the axial direction d1 is equal to the length L2 of the second reflection region 23 along the axial direction d1. However, the length L1 of the first reflection region 22 and the length L2 of the second reflection region 23 can be appropriately set in consideration of the relationship of the expression (3).

  Furthermore, the desirable range of light guide efficiency C (450) and C (600) is shown. In JIS9112, the chromaticity ranges of daylight color, daylight white, white, and warm white in a white light source are shown, and the range of each x value is 0.025 to 0.03. That is, it can be seen that if the x value changes by 0.03, a white color is recognized as a different color.

Ｚ／Ｘを新たにＲとおき、両辺を微分すると、

ここでΔｘとΔＲは、それぞれｘとＲの、導光路を通過することによる変化率である。前述のように入射端と出射端で同じ色と認識されるためには、x値の変化範囲が０．０３以下、すなわち±０．０１５以下であることが必要である。従って、

ここで、Ｒは、導光路による変化は十分小さいとみなして、式（５）から１と近似できる。Ｒ＝１を代入して整理すると、

ΔＲを、式（５）と式（６）から求めると、

導光路の出射端と入射端が同じ色と認識されるためには、この式を満たすことが望ましい。 By definition, the x value is obtained from the stimulus values X, Y, and Z by the following equation. However, X, Y, and Z are integral values of the color matching functions X (λ), Y (λ), and Z (λ), respectively.
x = X / (X + Y + Z) (4)
Since the direct light of sunlight is white at the incident end, the stimulus value X and the stimulus value Z may be close to 1.
X = 1, Z = 1 (5)
Further, at the emission end, the stimulus value X and the stimulus value Z can be approximated to be equal to the light guide efficiency at a wavelength of 600 nm and a wavelength of 450 nm, respectively. That is,
X = C (600), Z = C (450) (6)
The stimulus value Y can be approximated to the average of X and Z.
Y = (X + Z) / 2 (7)
Substituting equation (7) into equation (4) and rearranging,

When Z / X is newly set to R and both sides are differentiated,

Here, Δx and ΔR are rates of change of x and R, respectively, by passing through the light guide. As described above, in order to recognize the same color at the entrance end and the exit end, the change range of the x value needs to be 0.03 or less, that is, ± 0.015 or less. Therefore,

Here, R can be approximated to 1 from Equation (5), assuming that the change due to the light guide is sufficiently small. Substituting R = 1 and rearranging,

When ΔR is obtained from Equation (5) and Equation (6),

It is desirable to satisfy this equation in order for the exit end and entrance end of the light guide to be recognized as the same color.

  Returning to FIG. 1, a light output member 13 made of a diffusion plate is installed at the end of the shaft member 20 connected to the room 2. According to the light exiting member 13 made of a diffusion plate, the inside of the room 2 can be illuminated uniformly with the light guided from the shaft member 20. However, the light exiting member 13 may not be installed at the end of the shaft member 20, and the light guided through the shaft member 20 may be emitted directly from the end of the light guide member 12.

  Next, the operation of the present embodiment configured as described above will be described.

  The sun's altitude is relatively low during winter and in the morning and evening hours. Light from the low altitude sun enters the daylighting member 11 at a certain incident angle and is guided to the light guide member 12. The sunlight guided to the light guide member 12 is guided toward the room 2 while being repeatedly reflected in the light guide path 28. As described above, the inner surface 21 of the shaft member 20 has the first reflection region 22 that reflects light having a relatively large wavelength with high reflectance and the first reflection region 22 that reflects light having a relatively low wavelength with high reflectance. 2 reflection regions 23 are formed. From this, the sunlight that is repeatedly reflected in the light guide path 28 is reflected in a balanced manner by the first reflection region 22 and the second reflection region 23, and it is suppressed that light of a specific wavelength is greatly attenuated. The The light guided in the light guide path 28 is incident on the light output member 13 as a diffusion plate attached to the end of the shaft member 20. The light that has entered the light exiting member 13 is diffused by the light exiting member 13 and illuminates the interior of the room 2 evenly.

  On the other hand, the altitude of the sun is relatively high in summer, especially in the daytime. Light from the high altitude sun enters the daylighting member 11 at another incident angle and is guided to the light guide member 12. The sunlight guided to the light guide member 12 is guided toward the room 2 while being repeatedly reflected in the light guide path 28. As described above, the inner surface 21 of the shaft member 20 has the first reflection region 22 that reflects light having a relatively large wavelength with high reflectance and the first reflection region 22 that reflects light having a relatively low wavelength with high reflectance. 2 reflection regions 23 are formed. For this reason, the light that repeats reflection in the light guide path 28 is reflected in a balanced manner by the first reflection region 22 and the second reflection region 23, and it is suppressed that light of a specific wavelength is greatly attenuated. Sunlight guided in the light guide path 28 enters the light output member 13 as a diffusion plate attached to the end of the shaft member 20. The sunlight that has entered the light exiting member 13 is diffused by the light exiting member 13 and illuminates the interior of the room 2 evenly.

  As described above, according to the present embodiment, the shaft-shaped shaft member 20 having the inner surface 21 that defines the light guide path 28 that guides light is provided, and light having a wavelength of 450 nm is formed on the inner surface 21 of the shaft member 20. A first reflection region 22 that reflects light having a wavelength of 600 nm with a higher reflectance than the first reflection region 22 and a second reflection region 23 that reflects light with a wavelength of 450 nm with a higher reflectance than the light with a wavelength of 600 nm are formed. According to such a form, the light which repeats reflection within the light guide path 28 is reflected in a balanced manner by the first reflection region 22 and the second reflection region 23, thereby suppressing the light having a specific wavelength from being greatly attenuated. be able to. As a result, it is possible to effectively suppress the light from being tinted while suppressing the attenuation of the guided light.

  Further, according to the present embodiment, the first reflection region 22 formed circumferentially on the inner surface 21 of the shaft member 20 and the second reflection region 23 formed circumferentially on the inner surface 21 of the shaft member 20 are provided. The shaft member 20 is arranged side by side in the axial direction d1. According to such a form, the light guided in the light guide path 28 is reflected by the second reflection region 23 after being reflected by the first reflection region 22, or reflected by the second reflection region 23. It is easy to occur that the light is reflected by the first reflection region 22 after being applied. As a result, it is possible to effectively suppress the light that repeats reflection in the light guide path 28 from being reflected in a balanced manner by the first reflection region 22 and the second reflection region 23, and the light from being colored.

  Further, according to the present embodiment, the material forming the first reflection region 22 includes a silver component, and the material forming the second reflection region 23 includes an aluminum component. The silver component contained in the first reflection region 22 exhibits a high reflectance with respect to visible light, and reflects light having a wavelength of 600 nm with a higher reflectance than light having a wavelength of 450 nm. On the other hand, the aluminum component contained in the second reflective region 23 exhibits a high reflectance with respect to visible light, and reflects light having a wavelength of 450 nm with a higher reflectance than light having a wavelength of 600 nm. Therefore, when the material forming the first reflection region 22 includes a silver component and the material forming the second reflection region 23 includes an aluminum component, the light is tinted while suppressing attenuation of the guided light. It is possible to effectively realize the effect of effectively suppressing this.

≪Modification≫
Note that various modifications can be made to the above-described embodiment. Hereinafter, an example of modification will be described with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above embodiment are used for the parts that can be configured in the same manner as in the above embodiment. A duplicate description is omitted.

  In the above-described embodiment, as shown in FIG. 2, an example in which one first reflection region 22 and one second reflection region 23 are adjacent to each other in the axial direction d1 is shown. It is not limited. FIGS. 5 to 9 show other arrangement examples of the first reflection region 22 and the second reflection region 23. Among these, in the example shown in FIG. 5, the plurality of first reflection regions 22 and the plurality of second reflection regions 23 are alternately arranged in the axial direction d <b> 1 of the shaft member 20. Each first reflection region 22 is formed in a circumferential shape on the inner surface 21 of the shaft member 20 and surrounds the light guide path 28. Each second reflection region 23 is formed in a circumferential shape on the inner surface 21 in the axial direction d1 and surrounds the light guide path 28. According to such a form, the light guided in the light guide path 28 is easily reflected repeatedly in the first reflection region 22 and the second reflection region 23. As a result, it is possible to more effectively suppress the light that repeats reflection in the light guide path 28 from being reflected by the first reflection region 22 and the second reflection region 23 in a well-balanced manner.

  In the example shown in FIG. 6, the first reflection region 22 is formed on the first surface 21 a and the third surface 21 c of the inner surface 21 of the shaft member 20, and the second surface 21 b and the fourth surface 21 d are second. Reflective regions 23 are respectively formed. The first reflective region 22 disposed on the first surface 21a covers the entire area of the first surface 21a, and the first reflective region 22 disposed on the third surface 21c covers the entire area of the third surface 21c. Yes. Further, the second reflection region 23 disposed on the second surface 21b covers the entire area of the second surface 21b, and the second reflection region 23 disposed on the fourth surface 21d covers the entire area of the fourth surface 21d. Covering.

  Thus, according to the light guide member 12 shown in FIG. 6, the first reflection region 22 and the second reflection region disposed on the inner surface 21 of the shaft member 20 so as to face each other in one direction d2 orthogonal to the axial direction d1. 23, and another first reflection region 22 and another second reflection region 23 that are disposed to face each other in a direction d3 that is orthogonal to the axial direction d1 and intersects one direction d2 are formed. According to such a form, since the first reflection region 22 and the second reflection region 23 are disposed so as to face each other, the light guided in the light guide path 28 is the first reflection region 22 and the second reflection. It becomes easy to repeat reflection alternately in the region 23. As a result, it is possible to more effectively suppress the light that repeats reflection in the light guide path 28 from being reflected by the first reflection region 22 and the second reflection region 23 in a well-balanced manner.

  On the other hand, in the example shown in FIG. 7, the first reflection region 22 and the second reflection region 23 are arranged in plane symmetry with respect to the plane P <b> 1 parallel to the axial direction d <b> 1 of the shaft member 20. More specifically, the first reflection region 22 and the second reflection region 23 are arranged symmetrically with respect to the plane P1 including the central axis of the shaft member 20. In the example shown in the figure, the second reflection region 23 is formed on the first surface 21a, and the first reflection region 22 is formed on the second surface 21b. A second reflective region 23 is formed in a region of the third surface 21c on the first surface 21a side, and a first reflective region 22 is formed in a region of the third surface 21c on the second surface 21b side. In addition, a second reflective region 23 is formed in a region on the first surface 21a side of the fourth surface 21d, and a first reflective region 22 is formed in a region on the second surface 21b side of the fourth surface 21d. The second reflective region 23 disposed on the first surface 21a covers the entire area of the first surface 21a, and the first reflective region 22 disposed on the second surface 21b covers the entire area of the second surface 21b. Yes. Moreover, the 1st reflective area | region 22 arrange | positioned at the 3rd surface 21c and the 2nd reflective area | region 23 cover the whole area of the said 3rd surface 21c in an equal ratio, and the 1st reflective area | region 22 arrange | positioned at the 3rd surface 21c. And the second reflection region 23 cover the entire area of the third surface 21c at an equal ratio.

  Thus, according to the light guide member 12 shown in FIG. 7, the first reflection region 22 and the second reflection region 23 are arranged in plane symmetry with respect to the plane P1 parallel to the axial direction d1 of the shaft member 20. Therefore, the light guided in the light guide path 28 is likely to be repeatedly reflected in the first reflection region 22 and the second reflection region 23 alternately. As a result, it is possible to more effectively suppress the light that repeats reflection in the light guide path 28 from being reflected by the first reflection region 22 and the second reflection region 23 in a well-balanced manner.

  On the other hand, in the example shown in FIG. 8, the plurality of first reflection regions 22 and the plurality of second reflection regions 23 are arranged so as to be alternately arranged in the circumferential direction along the inner surface 21 of the shaft member 20. Each first reflection region 22 and each second reflection region 23 are formed in a stripe shape and have a longitudinal direction in the axial direction d1. In the example illustrated, the first reflection region 22 and the second reflection region 23 are arranged one by one on each surface 21 a to 21 d constituting the inner surface 21 of the shaft member 20.

  Thus, according to the light guide member 12 shown in FIG. 8, the first reflection region 22 and the second reflection region 23 are formed on each of the first surface 21a to the fourth surface 21d. According to such a form, since the plurality of first reflection regions 22 and the plurality of second reflection regions 23 are arranged on the inner surface 21 of the shaft member 20 in a balanced manner, the light guided through the light guide path 28. However, it becomes easy to repeat reflection alternately in the first reflection region 22 and the second reflection region 23. As a result, it is possible to more effectively suppress the light that repeats reflection in the light guide path 28 from being reflected by the first reflection region 22 and the second reflection region 23 in a well-balanced manner.

  In the example illustrated in FIG. 9, a plurality of first reflection regions 22 and a plurality of second reflection regions 23 are arranged in a staggered manner on the inner surface 21 of the shaft member 20. That is, a plurality of rectangular first reflection regions 22 and a plurality of rectangular second reflection regions 23 are alternately arranged in the axial direction d1 on each surface 21a to 21d constituting the inner surface 21 of the shaft member 20, and the axial direction d1. They are also arranged alternately in the direction perpendicular to.

  Therefore, according to the light guide member 12 illustrated in FIG. 9, the plurality of first reflection regions 22 and the plurality of second reflection regions 23 are distributed in a balanced manner on the inner surface 21 of the shaft member 20. The light guided in the inside is easily reflected repeatedly in the first reflection region 22 and the second reflection region 23. As a result, it is possible to more effectively suppress the light that repeats reflection in the light guide path 28 from being reflected by the first reflection region 22 and the second reflection region 23 in a well-balanced manner.

  In the above-described embodiment, as shown in FIG. 2, the example in which the area ratio between the first reflection region 22 and the second reflection region 23 is not variable is shown, but the present invention is not limited to such an example. 10 and 11 show an example in which the area ratio between the first reflection region 22 and the second reflection region 23 is variable. In the example shown in FIGS. 10 and 11, the hollow shaft member 20 includes a first portion 20a, a second portion 20b, and a third portion 20c arranged along the axial direction d1. The first portion 20 a is connected to the daylighting member 11 provided on the roof 5, and the third portion 20 c is connected to the light output member 13 provided on the ceiling 4. The second portion 20b is movable along the axial direction d1 between the first portion 20a and the second portion 20b.

  On the inner surface 211 of the first portion 20a and the inner surface 212 of the second portion 20b, the above-described first reflection region 22 that reflects light having a relatively large wavelength with high reflectance is formed. On the other hand, on the inner surface 213 of the third portion 20c, a second reflection region 23 that reflects light having a relatively low wavelength with a high reflectance is formed. A light guide path 28 that repeatedly reflects and guides light in a space surrounded by the inner surface 211 of the first portion 20a, a space surrounded by the inner surface 212 of the second portion 20b, and a space surrounded by the inner surface 213 of the third portion 20c. Is defined.

  In the example shown in FIGS. 10 and 11, the outer diameter of the second portion 20b is smaller than the inner diameter of the first portion 20a and the inner diameter of the third portion 20c. The second portion 20b is partially accommodated in the first portion 20a and the third portion 20c, and partially overlaps the first portion 20a and the third portion 20c. The outer surface of the second portion 20b and the inner surface 211 of the first portion 20a are relatively movable so as to prevent light from leaking between the outer surface of the second portion 20b and the inner surface 211 of the first portion 20a. Close to the extent. Similarly, the outer surface of the second portion 20b and the inner surface 213 of the third portion 20c are relatively movable so as to suppress light leakage from between the outer surface of the second portion 20b and the inner surface 213 of the third portion 20c. Close enough.

  As described above, the second portion 20b is movable along the axial direction d1 with respect to the first portion 20a and the third portion 20c. When the second portion 20b moves along the axial direction d1, the overlapping range of the second portion 20b, the first portion 20a, and the third portion 20c changes. Therefore, the area A2 at which the second reflection region 23 provided in the third portion 20c is exposed to the light guide path 28 changes according to the position where the second portion 20b moves along the axial direction d1. As a result, the ratio of the area A1 exposed to the light guide path 28 of the first reflection region 22 and the area A2 exposed to the light guide path 28 of the second reflection region 23 changes.

  10 and 11, according to the position where the second portion 20b has moved along the axial direction d1, the area A1 exposed to the light guide path 28 of the first reflective region 22 and the second reflective region The ratio of the area A <b> 2 exposed to the light guide path 28 of 23 changes. Therefore, by relatively moving the second portion 20b, the number of reflections of the guided light at the first reflection region 22 and the second reflection region 23 can be adjusted. Thereby, it can suppress more effectively that the light guided in the light guide path 28 is colored.

  Moreover, in the light guide member 12 described above, an example in which a hollow movable member 40 provided so as to be movable in the axial direction d1 with respect to the shaft member 20 in the light guide path 28 is further provided as shown in FIGS. Shown in In the example shown in FIGS. 12 and 13, the hollow movable member 40 opens in the axial direction d <b> 1 of the shaft member 20, and the hollow space is connected to the light guide path 28. A third reflection region 43 that reflects light having a wavelength of 600 nm with a higher reflectance than light having a wavelength of 450 nm is reflected on the inner surface 41 of the movable member 40, and a light having a reflectance of 450 nm that is higher than that of light having a wavelength of 600 nm. 4 reflection regions 44 are formed. As the material forming the third reflection region 43, the same material as the material forming the first reflection region 22 of the shaft member 20 can be used, and as the material forming the fourth reflection region 44, the second reflection region of the shaft member 20 is used. The same material as that forming 23 can be used.

  As shown in FIGS. 12 and 13, the third reflective region 43 and the fourth reflective region 44 are aligned with the arrangement of the first reflective region 22 and the second reflective region 23 along the axial direction d1 of the shaft member 20. They are arranged side by side. In the illustrated example, one third reflection region 43 and one fourth reflection region 44 are adjacent to each other in the axial direction d1. The third reflection region 43 is formed in a circumferential shape along the inner surface 41 of the movable member 40 in the light incident side region of the movable member 40. The fourth reflection region 44 is formed in a circumferential shape along the inner surface 41 of the movable member 40 in the light output side region of the movable member 40.

  A rail 51 extending in the axial direction d1 is disposed on the fourth surface 21d positioned below the shaft member 20 in the vertical direction. On the other hand, the movable member 40 has a wheel 52 that can slide on the rail 51. When the wheel 52 of the movable member 40 rolls on the rail 51 of the shaft member 20, the movable member 40 can move in the axial direction d <b> 1 with respect to the shaft member 20.

  In particular, FIG. 14 shows a state where the movable member 40 is moved to the light incident side with respect to the shaft member 20, and FIG. 15 shows a state where the movable member 40 is moved to the light output side with respect to the shaft member 20. The state is shown. As shown in FIGS. 14 and 15, when the movable member 40 is moved from the light incident side to the light outgoing side with respect to the shaft member 20, there is a range in which the movable member 40 covers the first reflective region 22 and the second reflective region 23. Change. In particular, as shown in FIG. 14, when the movable member 40 is moved to the light incident side with respect to the shaft member 20, the range in which the movable member 40 covers the first reflection region 22 increases and the second reflection region 23. The area that covers is decreasing. On the other hand, as shown in FIG. 15, when the movable member 40 is moved to the light output side with respect to the shaft member 20, the range in which the movable member 40 covers the first reflective region 22 decreases and the second reflective region. The range covering 23 increases.

  According to the movable member 40 shown in FIGS. 12 to 15, the movable member 40 moves in the first reflection region 22 and the second in accordance with the position where the movable member 40 is moved along the axial direction d <b> 1 with respect to the shaft member 20. The range covering the reflective area 23 changes. Therefore, the number of reflections of the guided light at the first reflection region 22 and the second reflection region 23 can be adjusted by relatively moving the movable member 40. Thereby, it can suppress more effectively that the light guided in the light guide path 28 is colored.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail using an Example, this invention is not limited to this Example. As described below, the light guide member according to the example was designed, and attenuation of the guided light was confirmed by simulation.

  Example 1 corresponds to the light guide member shown in FIG. The first reflection region and the second reflection region were provided on the inner surface of the shaft member so that the ratio was 1: 1. Silver was adopted as a material forming the first reflection region, and aluminum was adopted as a material forming the second reflection region.

  The first comparative example corresponds to the first embodiment in which the material forming the second reflective region is the same silver as the material forming the first reflective region. That is, the comparative example 1 is a form in which a reflective region made of silver is formed on the entire inner surface of the light guide member.

  Comparative Example 2 corresponds to Embodiment 1 in which the material forming the first reflective region is the same aluminum as the material forming the second reflective region. That is, the comparative example 2 is a form in which a reflective region made of aluminum is formed on the entire inner surface of the light guide member.

  In the light guide members according to Example 1 and Comparative Examples 1 and 2, white light was incident on the light guide member at a certain incident angle, and the white light was reflected six times in total on the inner surface of the shaft member. At this time, the white light incident on the light guide member according to Example 1 was reflected three times in the first reflection region and reflected three times in the second reflection region. FIG. 16 shows the results obtained in this simulation. FIG. 16 is a graph showing the relationship between the wavelength of light and the light guide efficiency for each light guide member.

  As understood from FIG. 16, in the light guide member according to Comparative Example 1 in which the reflection region made of silver is formed on the inner surface of the shaft member, the light guide efficiency of light having a relatively low wavelength is low in the visible light region. As a result, the light guide efficiency of light having a relatively high wavelength was high. In particular, the light guide efficiency of light having a wavelength of 450 nm was about 0.83, whereas the light guide efficiency of light having a wavelength of 600 nm was about 0.93. Therefore, it turns out that the light which passed the light guide member which concerns on the comparative example 1 is tinged with yellowishness.

  On the other hand, in the light guide member according to Comparative Example 2 in which the reflection region made of aluminum is formed on the inner surface of the shaft member, the light guide efficiency of light having a relatively low wavelength is high in the visible light region, and The result that the light guide efficiency of light was low was obtained. In particular, the light guide efficiency of light with a wavelength of 450 nm was about 0.63, whereas the light guide efficiency of light with a wavelength of 600 nm was about 0.57. Therefore, it turns out that the light which passed the light guide member which concerns on the comparative example 2 is tinged with blue.

  On the other hand, in the light guide member according to Example 1 in which two reflection regions were formed on the inner surface of the shaft member, there was almost no difference in the light guide efficiency of light of each wavelength in the visible light region. For example, the light guide efficiency of light having a wavelength of 450 nm is about 0.71, whereas the light guide efficiency of light having a wavelength of 600 nm is about 0.72. Therefore, it turns out that the light which passed the light guide member which concerns on Example 1 is hardly tinged with color.

  For Comparative Example 1, Comparative Example 2, and Example 1, the right side of Equation (12) is calculated to be 0.108, 0.105, and 0.014, respectively. It can be seen that Comparative Example 1 and Comparative Example 2 do not satisfy Expression (12), but Example 1 satisfies.

  Next, white light was incident on the light guide member according to Example 1 and Comparative Examples 1 and 2 at a certain incident angle, and the white light was reflected a total of 12 times on the inner surface of the shaft member. At this time, the white light incident on the light guide member according to Example 1 was reflected six times in the first reflection region and reflected six times in the second reflection region. FIG. 17 shows the results obtained in this simulation. FIG. 17 is a graph showing the relationship between the wavelength of light and the light guide efficiency for each light guide member.

  As understood from FIG. 17, the light guide members according to Example 1 and Comparative Examples 1 and 2 both have a light guide efficiency of relatively low wavelength and relative to the simulation shown in FIG. 16. In particular, the difference between the light guiding efficiency of light with a high wavelength tends to increase. Specifically, in the light guide member according to Comparative Example 1 in which the reflection region made of silver is formed on the inner surface of the shaft member, the light guide efficiency of light with a wavelength of 450 nm is about 0.69, whereas the wavelength is 600 nm. The light guiding efficiency was about 0.88. In the light guide member according to Comparative Example 2 in which the reflection region made of aluminum is formed on the inner surface of the shaft member, the light guide efficiency of light with a wavelength of 450 nm is about 0.39, whereas light guide with a wavelength of 600 nm is guided. The efficiency was about 0.33. In the light guide member according to Example 1 in which two reflection regions are formed on the inner surface of the shaft member, the light guide efficiency of light having a wavelength of 450 nm is about 0.53, whereas the light guide efficiency of light having a wavelength of 600 nm is about 0.53. Was about 0.55.

  For Comparative Example 1, Comparative Example 2, and Example 1, the right side of Equation (12) is calculated to be 0.216, 0.182, and 0.036, respectively. It can be seen that Comparative Example 1 and Comparative Example 2 do not satisfy Expression (12), but Example 1 satisfies.

  Therefore, according to the simulation shown in FIG. 17, the light that has passed through the light guide member according to Comparative Example 1 has a stronger yellow tint, and the light that has passed through the light guide member according to Comparative Example 2 has a stronger blue tint. You can see that On the other hand, the result that the light which passed the light guide member which concerns on Example 1 is hardly tinted was obtained.

DESCRIPTION OF SYMBOLS 1 Building 2 Room 10 Daylighting system 12 Light guide member 20 Shaft member 21 Inner surface 21a-d 1st-4th surface 22 1st reflection area 23 2nd reflection area 28 Light guide path 40 Movable member 41 Inner surface 42 Reflection area 43 3rd Reflection area 44 Fourth reflection area d1 Axial direction d2 One direction d3 Other direction

Claims (9)

An axial shaft member having an inner surface defining a light guide path for guiding light;
A first reflection region that reflects light having a wavelength of 600 nm with a higher reflectance than light having a wavelength of 450 nm on the inner surface of the shaft member, and a second reflection that reflects light having a wavelength of 450 nm with higher reflectance than light having a wavelength of 600 nm. A light guide member in which a region is formed.   A first reflection region formed circumferentially on the inner surface of the shaft member and a second reflection region formed circumferentially on the inner surface of the shaft member are arranged side by side in the axial direction of the shaft member. The light guide member according to claim 1.   The light guide member according to claim 1 or 2, wherein the first reflection region and the second reflection region are alternately arranged in the axial direction of the shaft member.   On the inner surface of the shaft member, a first reflection region and a second reflection region that are arranged to face each other in one direction orthogonal to the axial direction of the shaft member, and orthogonal to the axial direction of the shaft member and the one The light guide member according to any one of claims 1 to 3, wherein at least another first reflection region and a second reflection region that are arranged to face each other in a direction that intersects the direction are formed. An inner surface of the shaft member intersects with the first surface and the second surface arranged to face one direction orthogonal to the axial direction of the shaft member, and is orthogonal to the axial direction of the shaft member and intersects the one direction. Including a third surface and a fourth surface disposed to face each other,
The first reflection region and the second reflection region are formed on each of the first surface, the second surface, the third surface, and the fourth surface, according to any one of claims 1 to 4. The light guide member as described. The material forming the first reflective region includes a silver component,
The light guide member according to any one of claims 1 to 5, wherein the material forming the second reflective region includes an aluminum component.   The ratio of the area exposed to the light guide path of the first reflective region and the area exposed to the light guide path of the second reflective region can be changed. The light guide member according to item. A hollow movable member provided so as to be movable in the axial direction of the shaft member with respect to the shaft member in the light guide path;
The hollow movable member is opened in the axial direction of the shaft member, and a reflection region for reflecting light is formed on the inner surface of the hollow movable member,
The range in which the movable member covers the first reflection region and the second reflection region changes according to a position where the movable member is moved along the axial direction with respect to the shaft member. The light guide member according to claim 7.   The reflection region formed on the inner surface of the movable member includes a third reflection region that reflects light having a wavelength of 600 nm with a higher reflectance than light having a wavelength of 450 nm, and a reflectance that has a higher reflectance of 450 nm than light having a wavelength of 600 nm. The light guide member according to claim 8, further comprising: a fourth reflection region that is reflected by the lens.

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