Patent Publication Number: US-2023151936-A1

Title: Construction component, light radiating system, and illumination system

Description:
TECHNICAL FIELD 
     The present disclosure generally relates to a construction component, a light radiating system, and an illumination system, and more particularly to a construction component that emits illumination light, a light radiating system including the construction component, and an illumination system including the light radiating system. 
     BACKGROUND ART 
     Described in Patent Literature 1 is a construction panel with a lighting function, the construction panel with a lighting function described in Patent Literature 1 includes an outer frame, a metal frame, a front panel plate, a light source, and a light-guiding plate. The outer frame consists of a construction component. The metal frame is attached to the outer frame. The front panel plate is detachably attached to the metal frame. The light-guiding plate is arranged between the metal frame and the front panel plate. The light source is disposed so as to make its light-emitting portion face the light-guiding plate. The light-guiding plate guides the incident light coming from the light source therethrough, and emits the light from its emitting face facing the front panel plate. 
     In addition, Patent Literature 1 discloses that a construction panel with a lighting function is installed between two construction panels without a lighting function when constructing the construction panel into a ceiling. 
     It has been difficult to realize weigh reduction of the construction panel with a lighting function described in Patent Literature 1. 
     Citation List 
     Patent Literature 
     Patent Literature 1: JP2013-114982 A 
     SUMMARY OF INVENTION 
     It is therefore an object of the present disclosure to provide a construction component, a light radiating system, and an illumination system, all of which are configured or designed to reduce the weight of the construction component that can emit an illumination light. 
     A construction component according to one aspect of the present disclosure forms at least a part of a structure facing a target space. The construction component has a first function, a second function, and a third function. The first function is a function of emitting illumination light toward the target space. The second function is a function of allowing the incident light to enter the construction component. The incident light is emitted from a light source disposed out of a projection area, viewed from the target space, of the construction component, and is incident on the construction component via a light transmission member. The third function is a function of converting the incident light into the illumination light. 
     A light radiating system according to another aspect of the present disclosure includes the construction component and the light transmission member. 
     An illumination system according to still another aspect of the present disclosure includes the light radiating system and the light source. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    illustrates a configuration of an illumination system including a construction component according to a first embodiment; 
         FIG.  2 A  is a cross-sectional view, taken along a plane X2-X2 shown in  FIG.  2 B , of the construction component; 
         FIG.  2 B  is a bottom view illustrating the construction component; 
         FIG.  3    is a perspective view illustrating a structure including the construction component; 
         FIG.  4    illustrates a configuration of another illumination system including the construction component according to the first embodiment; 
         FIG.  5    illustrates a configuration of an illumination system including a construction component according to a second embodiment; 
         FIG.  6    illustrates a configuration of an illumination system including a construction component according to a third embodiment; 
         FIG.  7    illustrates a configuration of an illumination system including a construction component according to a fourth embodiment; 
         FIG.  8    illustrates a configuration of an illumination system including a construction component according to a fifth embodiment; and 
         FIG.  9    illustrates a configuration of an illumination system including a construction component according to a sixth embodiment. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Note that figures to be referred to in the following description of the first through sixth embodiments are just schematic representations, in which the dimensions and thicknesses of respective constituent elements and their ratios are not always to scale, compared with their actual dimensional ratios. 
     First Embodiment 
     Below, a construction component  10 , a light radiating system  100 , and an illumination system  200  according to the first embodiment will be described with reference to  FIGS.  1 - 3   . 
     Overview 
     The construction component  10  serves as at least a part of a structure  1  that faces a target space S 1 . “Faces the target space S1” means the structure  1  is in contact with the target space S 1 . The structure  1 , including the construction component  10  according to the first embodiment, is in contact with the target space S 1  to define the target space S 1 . The structure  1  may be a ceiling in a facility (e.g., an office construction) (refer to  FIG.  3   ). The target space S 1  is a space under the ceiling. The ceiling may be a complex ceiling system and include a grid-like support member, a plurality of ceiling members (ceiling panels)  9  to be supported by the support member, and the construction component  10 . Each of the plurality of ceiling members  9  has a panel shape. The ceiling member  9  has a shape of square when viewed along the thickness direction of the ceiling member  9 , but it may be rectangular. The construction component  10  has a panel shape. The construction component  10  is a ceiling member. The construction component  10  is supported by the support member, as with the ceiling members  9 . The construction component  10  is arranged adjacent to at least one of the plurality of ceiling members  9 . 
     The construction component  10  converts incident light L 1  (refer to  FIG.  2 A ) into illumination light L 2  and emits the illumination light L 2  into the target space S 1 . The incident light L 1  is emitted from a light source  2 , and is incident on the construction component  10  via a light transmission member  3 . The light source  2  is disposed out of a projection area A 10 , viewed from the target space S 1 , of the construction component  10 . “A projection area A 10 , viewed from the target space S 1 , of the construction component  10 ” means the projection area of the construction component  10  viewed along a direction perpendicular to a main surface  111 , which is in contact with the target space S 1 , of the construction component  10 . 
     The light radiating system  100  includes the construction component  10  and the light transmission member  3 . The illumination system  200  includes the light radiating system  100  and the light source  2 . The light radiating system  100  makes light that has been emitted from the light source  2  incident on the construction component  10  as the incident light L 1  via the light transmission member  3 , and converts, in the construction component  10 , the incident light L 1  into the illumination light L 2 , and emits the illumination light L 2  from the construction component  10 . The illumination system  200  makes the light source  2  emit light, makes the light incident on the construction component  10  as the incident light L 1  via the light transmission member  3 , and converts, in the construction component  10 , the incident light L 1  into the illumination light L 2 , and emits the illumination light L 2  from the construction component  10 . 
     The facility is not limited to office constructions, and it may be stand-alone houses, apartments, stores, museums, hotels, factories, stadiums, airports, or other constructions. 
     Configuration of Illumination System 
     The illumination system  200  includes, as shown in  FIG.  1   , the light source  2 , the light transmission member  3 , and the construction component  10 . 
     (2.1) Light Source 
     The light source  2  includes a laser light source  21 . The light emitted from the light source  2  may be light emitted from the laser light source  21 . The laser light source  21  may be a semiconductor laser that emits a blue light ray (a laser beam), for example, thus allowing the light source  2  to emit a blue light ray. The semiconductor laser may be a GaN-based semiconductor laser, for example. The peak wavelength of the laser light falls within the range from 440 nm to 480 nm, for example. 
     The light source  2  includes a case  20 , which contains the laser light source  21 . The case  20  is disposed at a position away from the construction component  10 . More specifically, the light source  2  is disposed out of the projection area A 10 , viewed from the target space S 1 , of the construction component  10 . For example, the light source  2  is disposed in the ceiling space. However, this is only an example and should not be construed as limiting. The light source  2  may be disposed on the surface of the floor behind a wall that defines the target space S 1  together with the structure  1 . In the construction component  10  according to the first embodiment, the projection area A 10 , viewed from the target space S 1 , of the construction component  10  is the projection area (a vertical projection area), viewed from the target space S 1  in a thickness direction of the construction component  10  having a panel shape, of the construction component  10 . In conclusion, the projection area A 10  is a projection area along a thickness direction of the construction component  10 . 
     (2.2) Light Transmission Member 
     The light transmission member  3  includes an optical fiber  31 . The optical fiber  31  includes a core, a clad, and a coating portion. The clad covers the outer peripheral surface of the core. The coating portion covers the outer peripheral surface of the clad. The core has a first end face, and a second face opposite from the first end face. A cross section, taken along a plane perpendicular to the optical axis, of the core has a circular shape. The clad is disposed coaxially with the core. The material of the core includes a light-transmitting material. The light transmitting-material may be, for example, a fluoride, an oxide, or a nitride. The fluoride may be glass fluoride. The oxide may be a silicon oxide or quartz, for example. The refractive index of the clad is less than the refractive index of the core. The coating portion covers the outer peripheral surface of the clad. The material of the coating portion may be a resin, for example. 
     The core of the optical fiber  31  may have a diameter falling within the range from 20 µm to 1000 µm, for example. The optical fiber  31  may have a length falling within the range from  1  m to 100 m, for example. If the diameter of the core of the optical fiber  31  is less than 20 µm, it becomes difficult to optically couple the light of the laser light source  21  with the optical fiber  31  with high efficiency. If the diameter of the core of the optical fiber  31  is more than 1000 µm, it becomes difficult to bend the optical fiber  31  with a small bending radius, thus increasing handling restrictions. 
     The optical fiber  31  includes a first end  311  and a second end  312 , which are arranged opposite from each other in its lengthwise direction. The first end  311  of the optical fiber  31  includes an incident end face (the first end face of the core) on which light emitted from the light source  2  is incident. The second end  312  of the optical fiber  31  includes an emerging end face (the second end face of the core) from which the light is emitted that has been incident on the incident end face and been transmitted through the optical fiber  31 . The first end  311  of the optical fiber  31  may be connected to the laser light source  21  via an optical fiber connector, for example. This connection allows the core of the optical fiber  31  to be coupled with the laser light source  21  optically. The second end  312  of the optical fiber  31  is connected with a light input/output portion  12  of the construction component  10  via an optical fiber connector, for example. This connection allows the core of the optical fiber  31  to be optically coupled with the light input/output portion  12  of the construction component  10 . 
     When a person in the target space S 1  sees the structure  1 , he or she cannot see the optical fiber  31  because the optical fiber  31  is covered by the structure  1  containing the construction component  10 . In other words, a part of the optical fiber  31  is shielded by the construction component  10 . 
     (2.3) Construction Component 
     The construction component  10  according to the first embodiment is a ceiling member that is arranged adjacent to at least one of the plurality of ceiling members  9  (which do not include the construction component  10  by definition). However, this is only an example and should not be construed as limiting. The construction component  10  may be arranged adjacent to another construction component  10 . The construction component  10  has a panel shape and square, like the ceiling member  9 , when viewed in its thickness direction. However, this is only an example and should not be construed as limiting. The construction component  10  may be rectangular. In this specification, “the construction component  10  is viewed in the thickness direction of construction component  10 ” means that the construction component  10  is viewed from the target space S 1  in the thickness direction of the construction component  10 , for example. It does not mean that the construction component  10  is viewed from an opposite side to the target space S 1  with reference to the construction component  10  in the thickness direction of the construction component  10 . The size of the construction component  10  is the same as the size of the ceiling member  9 , but they may be different in size from each other. The construction component  10  is, like the ceiling members  9 , supported by the support member. The support member may be, for example, formed of a plurality of galvanized steel plates or other similar members. 
     The construction component  10  includes a main body  11  and the light input/output portion  12 . The light input/output portion  12  is integrally formed with the main body  11 . Therefore, a position, relative to the target space S 1 , of the light input/output portion  12  is determined when the construction component  10  is supported by the support member. 
     The main body  11  has a panel shape. Viewed in the thickness direction of the construction component  10 , an outer peripheral shape of the main body  11  is the same as an outer peripheral shape of the construction component  10 . In other words, viewed from the thickness direction of the construction component  10 , the outer peripheral shape of the construction component  10  is the same as the outer peripheral shape of the main body  11 . In addition, viewed in the thickness direction of the construction component  10 , size of the construction component  10  is the same as size of the main body  11 . 
     The main body  11  may be, for example, made of decorative plywood or decorative boards. Examples of the decorative plywood include natural-wood decorative board and specially-treated decorative board. Examples of the specially-treated decorative board include synthetic resin decorative board, printed plywood, vinyl chloride decorative plywood, and overlayed plywood made of paper or cloth. Examples of the decorative board include MDF (medium-quality fiber board), volcanic silicates fiber reinforced multi-layer board, rock wool board, calcium silicate plate, and insulation board. The main body  11  include, for example, light-proofness, incombustibility, sound absorbency, and heat-insulating properties. Here, the main body  11  may include at least light-proofness and incombustibility. 
     The light input/output portion  12  is, viewed in the thickness direction of construction component  10 , located within a circumferential periphery (an outer edge) of the main body  11  and is apart from the circumferential periphery of the main body  11 . In the construction component  10  according to the first embodiment, the light input/output portion  12  penetrates through a substantial center part of the main body  11 . Viewed in the thickness direction of the construction component  10 , the outer peripheral shape of the light input/output portion  12  is circular. In order for the light input/output portion  12  to be hardly seen by a person in the target space S 1 , the area of the light input/output portion  12  is, viewed in the thickness direction of the construction component  10 , suitably much more smaller than the area of the main body  11 . The diameter of the light input/output portion  12  is equal to or less than one tenth of one side of the main body  11 , viewed in the thickness direction of the construction component  10 , suitably equal to or less than one twentieth, and more suitably equal to or less than one thirtieth. 
     The light input/output portion  12  has translucency so that part of the incident light L 1  (refer to  FIG.  2 A ) can pass therethrough. The incident light L 1  is emitted from the light source  2 , which is disposed out of the projection area A 10 , viewed from the target space S 1 , of the construction component  10 , and is incident on the construction component  10  via the light transmission member  3 . In addition, the light input/output portion  12  emits the illumination light L 2 , which includes part of the incident light L 1 , toward the target space S 1 . The illumination light L 2  may be white light. 
     The construction component  10  has a first function, a second function, and a third function. The first function is a function of emitting the illumination light L 2  toward the target space S 1 . The second function is a function of allowing the incident light L 1  to enter the construction component  10 . The incident light L 1  is emitted from the light source  2 , which is disposed out of the projection area A 10 , viewed from the target space S 1 , of the construction component  10 , and is incident on the construction component  10  via the light transmission member  3 . The third function is a function of converting the incident light L 1  into the illumination light L 2 . The incident light L 1  is light with a high coherence (coherent light) and the illumination light L 2  is light with a low coherence (incoherent light). In the construction component  10 , the light input/output portion  12  has the first function, the second function, and the third function. 
     The feature that the light input/output portion  12  “has translucency” means that the ratio of the optical energy of the illumination light L 2  to the optical energy of the incident light L 1  incident on the light input/output portion  12  is equal to or more than 10%. The ratio may be suitably equal to or more than 20%, and more suitably equal to or more than 40%. 
     The light input/output portion  12  includes a light-input portion  121 , a wavelength-converting portion  122 , and a light-outputting portion  123 . In the light input/output portion  12 , the light-outputting portion  123 , the light-input portion  121 , and the wavelength-converting portion  122  has the first function, the second function, and the third function, respectively. The third function includes a function of converting the incident light L 1  into the illumination light L 2  containing light having a wavelength different from that of the incident light L 1 . 
     The light-input portion  121  allows the incident light L 1  to enter the construction component  10 . The incident light L 1  is incident on to the construction component  10  via the light transmission member  3 , and transmits the incident light L 1  to the wavelength-converting portion  122 . In other words, the light-input portion  121  suitably has low reflectivity and absorptivity to the incident light L 1 . The light-input portion  121  may include, for example, an optical connector to which the optical fiber connector is detachably connected, the optical fiber connector being connected to the second end  312  of optical fiber  31 . 
     The wavelength-converting portion  122  includes a light transmission material portion and fluorescent particles, for example. In this case, the wavelength-converting portion  122  includes a mixture of the light transmission material portion and the fluorescent particles. The wavelength-converting portion  122  includes the light transmission material portion containing a lot of fluorescent particles. The material (light transmission material) of the light transmission material portion is suitably a material having a high transmittance for a visible light ray. The light transmission material may be a silicone-based resin, for example. This allows the light input/output portion  12  to have improved heat proofness and weatherability of the wavelength-converting portion  122 . “Silicone-based resin” may be, for example, a silicone resin or a denatured silicone resin. The wavelength-converting portion  122  includes, as a wavelength-converting element, fluorescent particles. The wavelength-converting element converts a part of the incident light L 1  that has been supplied by the light-input portion  121  and emits the light having wavelength different from that of the incident light L 1 . As the fluorescent particles, for example, yellow fluorescent particles radiating yellow light may be employed. The light (fluorescence) emitted from the yellow fluorescent particles may, for example, suitably have an emission spectrum with a main light-emitting peak wavelength falling within the wavelength range from 530 nm to 580 nm. The yellow fluorescent particles may be Y 3 Al 5 O 12  activated with Ce, for example. However, this is only an example and should not be construed as limiting. 
     The wavelength-converting portion  122  includes, as the wavelength-converting element, only yellow fluorescent particles. However, this is only an example and should not be construed as limiting. The wavelength-converting portion  122  contains, for example, yellow fluorescent particles, yellow-green fluorescent particles, green fluorescent particles, and red fluorescent particles. In other words, the wavelength-converting portion  122  may include plural kinds of fluorescent particles. 
     The light-outputting portion  123  is made from a light transmission material that does not contain fluorescent particles. The light transmission material may be a silicone resin, for example. However, this is only an example and should not be construed as limiting. The light transmission material may contain, for example, a fluorine-based resin, low-melting point glass, or sol-gel glass. The light transmission material may suitably include a material having a high transmittance for visible light. The light-outputting portion  123  may include light scattering particles. In addition, the light-outputting portion  123  may have a lens shape that can control light distribution of the illumination light L 2  to be emitted from the light-outputting portion  123 . Since the light-outputting portion  123  is in contact with the target space S 1 , the light-outputting portion  123  may include a reflection-reducing portion to reduce Fresnel reflection. The reflection-reducing portion may be made from a material having a refractivity smaller than that of the light transmission material portion of the wavelength-converting portion  122 , or may be microscopic surface unevenness having a difference in height equal to or less than 200 nm, whichever is appropriate. 
     (2.4) Other Constituent Elements of Illumination System 
     The illumination system  200  may further has a power supply unit. The power supply unit supplies electric power to the laser light source  21  and other components. The power supply unit may include a drive circuit for driving the laser light source  21  of the light source  2  and a control circuit for controlling the drive circuit. In the illumination system  200 , controlling of the drive circuit by the control circuit allows the light-output of the laser light source  21  to be adjusted, as a result of which the luminance (brightness) of the illumination light L 2  can be adjusted. The power supply unit may be contained in the case  20  of the light source  2 . However, this is only an example and should not be construed as limiting. The power supply unit may not be contained in the case  20 . To the power supply unit, a power supply voltage may be supplied from the off-site source via wires. 
     Operation of Illumination System 
     According to the illumination system  200 , the light source  2  (more specifically, the laser light source  21 ) emits light. In the illumination system  200 , the light (blue light) emitted from the light source  2  is incident on the optical fiber  31  and transmitted through the optical fiber  31 , and is incident on the light input/output portion  12  of the construction component  10 . The incident light L 1 , which is light incident on the light input/output portion  12 , is converted into the illumination light L 2 , and the illumination light L 2  is emitted. The illumination light L 2  may be a mixed light in which blue light and yellow light are mixed together. The mixed light, which is emitted from the light input/output portion  12 , is incoherent light. 
     Summary 
     The construction component  10  according to the first embodiment forms at least a part of the structure  1  that faces the target space S 1 . The construction component  10  has the first function, the second function, and the third function. The first function is a function of emitting the illumination light L 2  toward the target space S 1 . The second function is a function of allowing the incident light L 1  to enter the construction component. The incident light L 1  is emitted from the light source  2  disposed out of the projection area A 10 , viewed from the target space S 1 , of the construction component  10 , and is incident on the construction component  10  via the light transmission member  3 . The third function is a function of converting the incident light L 1  into the illumination light L 2 . 
     The construction component  10 , the light radiating system  100 , and the illumination system  200  according to the first embodiment enable reducing the weight of the construction component  10  that emits the illumination light L 2 . 
     Furthermore, the construction component  10  according to the first embodiment converts, instead of light from a light-emitting diode (LED), the incident light from the laser light source  21  into the illumination light L 2  and emits the illumination light L 2 , in the light input/output portion  12 . This enables narrowing the light distribution angle of the illumination light L 2 . 
     Furthermore, the construction component  10  according to the first embodiment enables reducing the light input/output portion  12  in size and making the design of the construction component  10  even more impressive for the viewer. In addition, since the construction component  10  according to the first embodiment does not need the power supply, a degree of freedom is increased in construction. 
     Furthermore, the illumination system  200  according to the first embodiment allows the light source  2 , which needs to be supplied the electric power, to be located apart from the construction component  10 , thus improving maintainability of the light source  2 . Note that the illumination system  200  according to the first embodiment includes the plurality of construction components  10  and the plurality of light sources  2 , which corresponds to the construction components  10 , respectively. 
     Furthermore, the construction component  10  according to the first embodiment allows the light source  2 , which is included in the illumination system  200 , to be disposed out of the projection area A 10  of the construction component  10 , thus reducing a rise in temperature of the construction component  10 . 
     Furthermore, the illumination system  200  according to the first embodiment employs the laser light (coherent light) emitted from the laser light source  21 . The coherent light has a high directivity, so it is suitable to be transmitted over a long distance in space and to be coupled to the optical fiber  31 . Accordingly, when the light source  2  is located out of the projection area A 10  of the construction component  10 , the illumination system  200  enables transmitting light efficiently into the projection area A 10  of construction component  10  to form the incident light L 1 . In contrast, the illumination light L 2  is incoherent light, so it is suitable for illuminating the target space S 1  uniformly. In the construction component  10 , the light radiating system  100 , and the illumination system  200  according to the first embodiment, the construction component  10  has the third function, a coherence-lowering function, of converting the coherent light (the incident light L 1 ) which is suitable for transmission, into the incoherent light (the illumination light L 2 ) which is suitable for illumination. This enables reducing the weight of the construction component  10  that emits the high-grade illumination light L 2 . 
     Variations of First Embodiment 
     Below, a variation of the illumination system  200  of the first embodiment will be described with reference to  FIG.  4   . In the following description, any constituent element of the illumination system  200  of the variation, having the same function as a counterpart of the first embodiment, will be designated by the same reference numerals as that counterpart’s, and description thereof will be omitted herein. 
     The illumination system  200  according to the variation is different from the illumination system  200  according to the first embodiment in that light is incident on a plurality of construction components  10  from one light source  2 . 
     In the illumination system  200  according to the variation, the light source  2  includes a splitter that splits the light emitted from the laser light source  21  and makes the lights incident on a plurality of optical fibers  31 . In the illumination system  200  according to variation  1 , this facilitates constructing the structure  1  and the illumination system  200 , which include a plurality of construction components  10 . 
     In the illumination system  200 , the light source  2  may include a plurality of laser light sources  21 , and the laser light sources  21  and the optical fibers  31  may be connected with each other on a one-to-one basis. 
     The illumination system  200  according to the variation makes it possible to reduce the number of the light sources  2 , thus improving maintainability, compared to a case where the light sources  2  correspond to the construction components  10  on a one-to-one basis. 
     Second Embodiment 
     Below, a construction component  10   a , a light radiating system  100   a  and an illumination system  200   a  according to a second embodiment will be described with reference to  FIG.  5   . In the following description, any constituent element of the construction component  10   a , the light radiating system  100   a , and the illumination system  200   a  of the second embodiment, having the same function as a counterpart of the construction component  10 , the light radiating system  100 , and the illumination system  200  of the first embodiment described above, will be designated by the same reference numeral as that counterpart’s, and description thereof will be omitted herein. 
     The construction component  10   a  according to the second embodiment is different from the construction component  10  according to the first embodiment in that the construction component  10   a  includes a plurality of (e.g., two in the example) light input/output portions  12 . The light radiating system  100   a  according to the second embodiment is different from the light radiating system  100  according to the first embodiment in that it includes the construction component  10   a , instead of the light radiating system  100  of the construction component  10  according to the first embodiment. Furthermore, the illumination system  200   a  according to the second embodiment is different from the illumination system  200  according to the first embodiment in that it includes the light radiating system  100   a , instead of the light radiating system  100  according to the first embodiment. 
     In the construction component  10   a , the light input/output portions  12  are apart from each other. The light radiating system  100   a  includes a plurality of optical fibers  31  corresponding to the plurality of the light input/output portions  12  on a one-to-one basis. In the illumination system  200   a , the light source  2  includes a distributor that makes the light emitted from one laser light source  21  incident on the plurality of optical fibers  31 . 
     The construction component  10   a  according to the second embodiment forms, like the construction component  10  according to the first embodiment, at least a part of the structure  1  facing the target space S 1 . The construction component  10   a  has a first function, a second function, and a third function. The first function is a function of emitting the illumination light L 2  toward target space S 1 . The second function is a function of allowing the incident light L 1  to enter the construction component  10   a . The incident light L 1  is emitted from the light source  2  disposed out of the projection area A 10 , viewed from the target space S 1 , of the construction component  10   a , and is incident on the construction component  10   a  via the light transmission member  3 . The third function is a function of converting the incident light L 1  into the illumination light L 2 . 
     The construction component  10   a , the light radiating system  100   a , and the illumination system  200   a  according to second embodiment enable reducing the weight of the construction component  10   a  that emits the illumination light L 2  from two points. 
     The construction component  10   a  according to the second embodiment is configured to make lights from one light source  2  incident on the plurality of light input/output portions  12 . This enables improving ease of implication while the construction component  10   a  having the plurality of light input/output portions  12 . 
     Third Embodiment 
     Below, a construction component  10   b , a light radiating system  100   b , and an illumination system  200   b  according to a third embodiment will be described with reference to  FIG.  6   . In the following description, any constituent element of the construction component  10   b , the light radiating system  100   b , and the illumination system  200   b  of the third embodiment, having the same function as a counterpart of the construction component  10   a , the light radiating system  100   a , and the illumination system  200   a  of the second embodiment described above, will be designated by the same reference numeral as that counterpart’s, and description thereof will be omitted herein. 
     The construction component  10   b  according to the third embodiment is different from the construction component  10   a  according to the second embodiment in that the plurality of light input/output portions  12  have light distribution characteristics different from each other. The light radiating system  100   b  according to the third embodiment is different from the light radiating system  100   a  according to the second embodiment in that it includes the construction component  10   b , instead of the construction component  10   a  of the light radiating system  100   a  according to the second embodiment. Furthermore, the illumination system  200   b  according to the third embodiment is different from the illumination system  200   a  according to the second embodiment in that it includes the light radiating system  100   b , instead of the light radiating system  100   a  according to the second embodiment. 
     In the construction component  10   b  according to the third embodiment, the light distribution angle of the illumination light L 2  emitted from the light input/output portion  12  on the left side in  FIG.  6    is larger than the light distribution angle of the illumination light L 2  emitted from the light input/output portion  12  on the right side in  FIG.  6   . Here, the light input/output portion  12  on the left side in  FIG.  6    and the light input/output portion  12  on the right side in  FIG.  6    include the light-outputting portions  123  having lens shapes different from each other, and thereby their light distribution angles of them are different from each other. 
     In the construction component  10   b  according to the third embodiment, the illumination light L 2  emitted from the light input/output portion  12  on the left side in  FIG.  6    may be utilized as an ambient illumination, and the illumination light L 2  emitted from the light input/output portion  12  on the right side in  FIG.  6    may be utilized as a task illumination. Accordingly, the construction component  10   b , the light radiating system  100   b , and the illumination system  200   b  according to the third embodiment enable implementing a task ambient illumination. 
     The construction component  10   b  according to the third embodiment forms, like the construction component  10   a  according to the second embodiment, at least a part of the structure  1  facing the target space S 1 . The construction component  10   b  has a first function, a second function, and a third function. The first function is a function of emitting the illumination light L 2  toward the target space S 1 . The second function is a function of allowing the incident light L 1  to enter the construction component  10   b . The incident light L 1  is emitted from the light source  2  disposed out of the projection area A 10 , viewed from the target space S 1 , of the construction component  10   b  and is incident on the construction component  10   b  via the light transmission member  3 . The third function is a function of converting the incident light L 1  into the illumination light L 2 . 
     The construction component  10   b , the light radiating system  100   b , and the illumination system  200   b  according to the third embodiment enable reducing the weight of the construction component  10   b  that emits the illumination light L 2  from two points. 
     Fourth Embodiment 
     Below, a construction component  10   c , a light radiating system  100   c , and an illumination system  200   c  according to a fourth embodiment will be described with reference to  FIG.  7   . In the following description, any constituent element of the construction component  10   c , the light radiating system  100   c , and the illumination system  200   c  of the fourth embodiment, having the same function as a counterpart of the construction component  10 , the light radiating system  100 , and the illumination system  200  of the first embodiment described above, will be designated by the same reference numeral as that counterpart’s, and description thereof will be omitted herein. 
     The construction component  10   c  according to the fourth embodiment is different from the construction component  10  according to the first embodiment in that light coming from the light source  2  is incident on the construction component  10   c  (e.g., its light input/output portion  12 ) via a light transmission member  3   c . The light radiating system  100   c  according to the fourth embodiment is different from the light radiating system  100  according to the first embodiment in that it includes the construction component  10   c  and the light transmission member  3   c , instead of the construction component  10  and the light transmission member  3  of the light radiating system  100  according to the first embodiment. Furthermore, the illumination system  200   c  according to the fourth embodiment is different from the illumination system  200  according to the first embodiment in that it includes the light radiating system  100   c , instead of the light radiating system  100  according to the first embodiment. 
     The light transmission member  3   c  includes a mirror  32 . The mirror  32  is disposed, in a thickness direction of the construction component  10   c , opposite to the target space S 1  with reference to the construction component  10   c . In other words, the mirror  32  is disposed close to the light-input portion  121 , away from the light-outputting portion  123 , of the light input/output portion  12 , and is disposed apart from the light input/output portion  12  in the thickness direction of the construction component  10   c . The mirror  32  is disposed within the projection area A 10  along the thickness direction of the construction component  10   c , and is overlapped with the light input/output portion  12  in the thickness direction of the construction component  10   c . The mirror  32  is disposed apart from the light source  2  in a direction perpendicular to the thickness direction of the construction component  10   c . 
     The mirror  32  is disposed so as to reflect the light, which is emitted from the light source  2  (e.g., its laser light source  21 ) and is transmitted through a space, toward the construction component  10   c  (e.g., its light input/output portion  12 ). Here, the construction component  10   c  has the second function of allowing the incident light L 1  to enter the construction component  10   c . The incident light L 1  is emitted from the light source  2  disposed out of the projection area A 10 , viewed from the target space S 1 , of the construction component  10   c , and is incident on the construction component  10   c  via the light transmission member  3   c . The light transmission member  3   c  does not include a member corresponding to the optical fiber  31  included in the light transmission member  3  of the light radiating system  100  and the illumination system  200  according to the first embodiment. Therefore, the light-input portion  121 , which has the second function, does not have an optical fiber connector. 
     The construction component  10   c  according to the fourth embodiment forms, like the construction component  10  according to the first embodiment, at least a part of the structure  1  facing the target space S 1 . The construction component  10   c  has a first function, a second function, and a third function. The first function is a function of emitting the illumination light L 2  toward the target space S 1 . The second function is a function of allowing the incident light L 1  to enter the construction component  10   c . The incident light L 1  is emitted from the light source  2  disposed out of projection area A 10 , viewed from the target space S 1 , of the construction component  10   c , and is incident on the construction component  10   c  via the light transmission member  3   c . The third function is a function of converting the incident light L 1  into the illumination light L 2 . 
     The construction component  10   c , the light radiating system  100   c , and the illumination system  200   c  according to the fourth embodiment enable reducing the weight of the construction component  10   c  that emits the illumination light L 2 . 
     Fifth Embodiment 
     Below, a construction component  10   d , a light radiating system  100   d , and an illumination system  200   d  according to a fifth embodiment will be described with reference to  FIG.  8   . In the following description, any constituent element of the construction component  10   d , the light radiating system  100   d , and the illumination system  200   d  of the fifth embodiment, having the same function as a counterpart of the construction component  10   c , the light radiating system  100   c , and the illumination system  200   c  of the fourth embodiment described above, will be designated by the same reference numeral as that counterpart’s, and description thereof will be omitted herein. 
     In the construction component  10   d  according to the fifth embodiment, the incident light L 1  incident on the construction component  10   d  is white light. The incident light L 1  is emitted from the light source  2  disposed out of the projection area A 10 , viewed from the target space S 1 , of the construction component  10   d , and is incident on the construction component  10   d  via the light transmission member  3   c . 
     The laser light source  21  of the light source  2  includes a first semiconductor laser that emits a red light ray, a second semiconductor laser that emits a green light ray, and a third semiconductor laser that emits a blue light ray to emit a white light ray containing a red light ray, a green light ray, and a blue light ray. 
     In the construction component  10   d , the light input/output portion  12   d  does not include a member corresponding to the wavelength-converting portion  122  of the light input/output portion  12  of the construction component  10   c  according to the fourth embodiment. The construction component  10   d  includes, in the light input/output portion  12   d , a first function, a second function, and a third function. The first function is a function of emitting the illumination light L 2  toward the target space S 1 . The second function is a function of allowing the incident light L 1  to enter the construction component  10   d . The incident light L 1  is emitted from the light source  2 , which is disposed out of the projection area A 10 , viewed from the target space S 1 , of the construction component  10   d  and is incident on the construction component  10   d  via the light transmission member  3   c . The third function is a function of converting the incident light L 1  into the illumination light L 2 . The light input/output portion  12   d  includes an optical diffusion element  124  disposed between the light-input portion  121  and the light-outputting portion  123 , instead of the wavelength-converting portion  122  of the construction component  10   c  according to the fourth embodiment. The optical diffusion element  124  is, for example, an optical diffusion plate made of glass. In the construction component  10   d  according to the fifth embodiment, the optical diffusion element  124  has the third function. In the construction component  10   d , the third function includes a function of converting the incident light L 1  into the illumination light L 2  that has a light distribution characteristic different from that of the incident light L 1 . While the incident light L 1  is light with a high-coherence, the illumination light L 2  is light with a relatively low-coherence. 
     The construction component  10   d , the light radiating system  100   d , and the illumination system  200   d  according to the fifth embodiment enable reducing the weight of the construction component  10   d  that emits the illumination light L 2 . 
     Since the construction component  10   d  according to the fifth embodiment does not include a member corresponding to the wavelength-converting portion  122  of the construction component  10   c , a temperature rise of the construction component  10   d  is further reduced, so that its service life is extended compared to the construction component  10   c . 
     Sixth Embodiment 
     Below, a construction component  10   e , a light radiating system  100   e , and an illumination system  200   e  according to the sixth embodiment will be described with reference to  FIG.  9   . In the following description, any constituent element of the construction component  10   e , the light radiating system  100   e , and the illumination system  200   e  of the sixth embodiment, having the same function as a counterpart of the construction component  10   c , the light radiating system  100   c , and the illumination system  200   c  of the fourth embodiment described above, will be designated by the same reference numeral as that counterpart’s, and description thereof will be omitted herein. 
     The construction component  10   e  according to the sixth embodiment is different from the construction component  10   c  according to the fourth embodiment in that it includes a plurality of (e.g., two in the example) light input/output portions  12 . The light radiating system  100   e  according to the sixth embodiment is different from the light radiating system  100   c  according to the fourth embodiment in that it includes the construction component  10   e , instead of the construction component  10   c  of the light radiating system  100   c  according to the fourth embodiment. Furthermore, the illumination system  200   e  according to the sixth embodiment is different from the illumination system  200   c  according to the fourth embodiment in that it includes the light radiating system  100   e , instead of the light radiating system  100   c  according to the fourth embodiment. 
     In the construction component  10   e , the light input/output portions  12  are apart from each other. The light radiating system  100   e  includes a light transmission member 3e, instead of the light transmission member  3   c  of the light radiating system  100   c  according to the fourth embodiment. The light transmission member 3e includes a mirror  33 , instead of the mirror  32  included in the light transmission member  3   c . The mirror  33  serves as a mirror that can sweep the light coming from the light source  2  over the construction component  10   e . The mirror  33  allows the light from the light source  2 , as the incident light L 1 , to be incident selectively on any of the plurality of light input/output portions  12  of the construction component  10   e . The mirror  33  is a micro-electromechanical systems (MEMS) mirror. However, this is only an example and should not be construed as limiting. The mirror  33  may be a polygon mirror, for example. 
     In the construction component  10   e  according to the sixth embodiment, the properties of the illumination light L 2  (referred to as a first illumination light L21) to be emitted from a light input/output portion  12  on the left side in  FIG.  9    is different from the properties of the illumination light L 2  (referred to as a second illumination light L22) to be emitted from the light input/output portion  12  on the right side in  FIG.  9   . Here, the property of the illumination light L 2  means color temperature. However, this is only an example and should not be construed as limiting. The properties of the illumination light L 2  may include, for example, color rendering performance or light distribution angle. 
     The construction component  10   e  according to the sixth embodiment forms, as the construction component  10   c  according to the fourth embodiment  4  does, at least a part of the structure  1  that faces the target space S 1 . The construction component  10   e  has a first function, a second function, and a third function. The first function is a function of emitting the illumination light L 2  toward the target space S 1 . The second function is a function of allowing the incident light L 1  to enter the construction component  10   e . The incident light L 1  is emitted from the light source  2  disposed out of the projection area A 10 , viewed from the target space S 1 , of the construction component  10   e , and is incident on the construction component  10   e  via the light transmission member 3e. The third function is a function of converting the incident light L 1  into the illumination light L 2 . 
     The construction component  10   e , the light radiating system  100   e , and the illumination system  200   e  according to the sixth embodiment enable reducing the weight of the construction component  10   e  that selectively emits the illumination light L 2  from two points. 
     Other Variations 
     Note that the first to sixth embodiments described above are only ones of various embodiments of the present disclosure and should not be construed as limiting. Rather, the first to sixth embodiments may be readily modified in various manners depending on a design choice or any other factor without departing from the scope of the present disclosure. 
     For example, viewed along the thickness direction of the construction component  10 , the outer peripheral shape of the light input/output portion  12  does not have to be circular. It may have, for example, an ellipse, rectangle, polygonal, or star shape. The polygonal shape includes pentagon, and more. 
     Furthermore, the construction component  10  does not have to be a ceiling member. It may be, for example, a wall member, flooring, or a beam. The construction component  10  has a panel shape when employed in a ceiling member, a wall member, or flooring. 
     Furthermore, the laser light source  21  included in the light source  2  does not have to be a semiconductor laser that emits a ray of blue laser light. It may be, for example, a semiconductor laser that emits a ray of purple laser light. In this case, the wavelength-converting portion  122  may suitably include blue fluorescent particles, yellow fluorescent particles, green fluorescent particles, and red fluorescent particles. 
     Furthermore, the light source  2  may include, for example, a light emitting diode (LED) light source and an optical system, instead of the laser light source  21 . The optical system collimates the light coming from the LED light source and emits the collimated light. 
     Recapitulation 
     The first to sixth embodiments and their variations described above may be specific implementations of the following aspects of the present disclosure. 
     A construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  10   e ) according to a first aspect forms at least a part of a structure (1) that faces a target space (S 1 ). The construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  10   e ) includes a first function, a second function, and a third function. The first function is a function of emitting illumination light (L 2 ) toward the target space (S 1 ). The second function is a function of allowing incident light to enter the construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  l   0   e ). The incident light is emitted from a light source ( 2 ) disposed out of a projection area (A 10 ), viewed from the target space (S 1 ), of the construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  l   0   e ), and is incident on the construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  10   e ) via a light transmission member ( 3 ;  3   c ;  3   e ). The third function is a function of converting the incident light into the illumination light (L 2 ). 
     The construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  10   e ) according to the first aspect enables reducing the weight of the construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  10   e ) that can emit illumination light (L 2 ). 
     In a construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  10   e ) according to a second aspect, which may be implemented in conjunction with the first aspect, the light source ( 2 ) includes a laser light source ( 21 ). 
     The construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  l   0   e ) according to the second aspect enables reducing the weight of the construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  l   0   e ). 
     In a construction component ( 10 ;  10   a ;  10   b ) according to a third aspect, which may be implemented in conjunction with the first or second aspect, the light transmission member ( 3 ) includes an optical fiber ( 31 ). 
     The construction component ( 10 ;  10   a ;  10   b ) according to the third aspect enables increasing the flexibility of the arrangement of the construction component ( 10 ;  10   a ;  10   b ). 
     In a construction component ( 10   c ;  10   d ;  10   e ) according to a fourth aspect, which may be implemented in conjunction with the first or second aspect, the light transmission member ( 3   c ;  3   e ) includes a mirror ( 32 ;  33 ). 
     The construction component ( 10   c ;  10   d ;  10   e ) according to the fourth aspect enables making the light coming from the light source ( 2 ) incident on the construction component ( 10   c ;  10   d ;  l   0   e ) without using an optical fiber. 
     In a construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   e ;  10   d ) according to a fifth aspect, which may be implemented in conjunction with any one of the first to fourth aspects, the third function includes a function of converting the incident light (L 1 ) into the illumination light (L 2 ) that has a light distribution characteristic different from a light distribution characteristic of the incident light (L 1 ). 
     In a construction component ( 10 ;  10   a ;  10   b ;  10   c ;  l   0   e ) according to a sixth aspect, which may be implemented in conjunction with any one of the first to fifth aspects, the third function includes a function of converting the incident light (L 1 ) into the illumination light (L 2 ) that has a wavelength different from a wavelength of the incident light (L 1 ) . 
     In the construction component ( 10 ;  10   a ;  10   b ;  10   c ;  l   0   e ) according to the sixth aspect, the illumination light (L 2 ) may be a light having a spectrum different from that of the incident light (L 1 ). 
     In a construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  10   e ) according to a seventh aspect, which may be implemented in conjunction with any one of the first to sixth aspects, the construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  10   e ) has a panel shape. 
     The construction component ( 10 ;10a;  10   b ;  10   c ;  10   d ;  10   e ) according to the seventh aspect enables reducing the construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  10   e ) in thickness and weight. 
     In a construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  10   e ) according to an eighth aspect, which may be implemented in conjunction with any one of the first to seventh aspects, the construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  10   e ) is a ceiling member. 
     The construction component ( 10 ) according to the eighth aspect enables reducing the weight of the construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  10   e ), thus improving ease of implementation. 
     A light radiating system ( 100 ;  100   a ;  100   b ;  100   c ;  100   d ;  100   e ) according to a ninth aspect includes the construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  10   e ) according to any one of the first to eighth aspects, and a light transmission member ( 3 ;  3   c ;  3   e ). 
     The light radiating system ( 100 ;  100   a ;  100   b ;  100   c ;  100   d ;  100   e ) according to the ninth aspect enables reducing the weight of the construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  10   e ) that can emit the illumination light (L 2 ). 
     An illumination system ( 200 ;  200   a ;  200   b ;  200   c ;  200   d ;  200   e ) according to a tenth aspect includes the light radiating system ( 100 ;  100   a ;  100   b ;  100   c ;  100   d ;  100   e ) according to the ninth aspect, and a light source ( 2 ). 
     The illumination system ( 200 ;  200   a ;  200   b ;  200   c ;  200   d ;  200   e ) according to the tenth aspect enables reducing the weight of the construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  10   e ) that can emit the illumination light (L 2 ) 
     In an illumination system ( 200 ;  200   a ;  200   b ;  200   c ;  200   d ;  200   e ) according to an eleventh aspect, which may be implemented in conjunction with the tenth aspect, the construction component ( 10 ) includes a plurality of construction components ( 10 ). The illumination system ( 200 ;  200   a ;  200   b ;  200   c ;  200   d ;  200   e ) is configured to allow light emitted from the light source ( 2 ), which is single, incident on the plurality of construction components ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  l   0   e ). 
     The illumination system ( 200 ;  200   a ;  200   b ;  200   c ;  200   d ;  200   e ) according to the eleventh aspect, the number of light source ( 2 ) is smaller than that of the construction component ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  l   0   e ), thus realizing better maintainability. 
     In an illumination system ( 200 ;  200   a ;  200   b ;  200   c ;  200   d ;  200   e ) according to a twelfth aspect, which may be implemented in conjunction with the eleventh aspect, the illumination light (L 2 ) includes a plurality of illumination lights that are emitted respectively from the plurality of construction components ( 10 ;  10   a ;  10   b ;  10   c ;  10   d ;  10   e ) and have light distribution characteristics different from each other.t 
     The illumination system ( 200 ;  200   a ;  200   b ;  200   c ;  200   d ;  200   e ) according to the twelfth aspect enables realizing a task ambient illumination, for example.  
     
       
         
           
               
               
               
             
               
                 Reference Signs List 
               
             
            
               
                 
                   1 
                 
                 Structure 
               
               
                 
                   2 
                 
                 Light Source 
               
               
                 
                   20 
                 
                 Case 
               
               
                 
                   21 
                 
                 Laser Light Source 
               
               
                   3 ,  3   c ,  3   e   
                 Light Transmission Member 
               
               
                 
                   31 
                 
                 Optical Fiber 
               
               
                 
                   311 
                 
                 First End 
               
               
                 
                   312 
                 
                 Second End 
               
               
                 
                   32 
                 
                 Mirror 
               
               
                 
                   33 
                 
                 Mirror 
               
               
                   10 ,  10   a ,  10   b ,  10   c ,  10   d ,  10   e   
                 Construction Component 
               
               
                   100 ,  100   a ,  100   b ,  100   c ,  100   d ,  100   e   
                 Light radiating System 
               
               
                   200 ,  200   a ,  200   b ,  200   c ,  200   d ,  200   e   
                 Illumination System 
               
               
                 A 10 
 
                 Projection Area 
               
               
                 L 1 
 
                 Incident Light 
               
               
                 L 2 
 
                 Illumination Light 
               
               
                 S 1 
 
                 Target Space