JP2017152287A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology which suppresses accumulation of dust and which can irradiate an irradiation surface with light efficiently, in a luminaire for indirect illumination.SOLUTION: A luminaire 1A includes: a light source 12A; and a housing 11A having an internal space for accommodating the light source 12A inside. At least one part of an outside wall for constituting the housing 11A is constituted by a diffusion plate 15A having light transmissivity. The light source 12A is arranged so that an optical axis of the light source 12A obliquely passes the diffusion plate 15A. By covering an opening of a space in which the light source 12A is accommodated by the diffusion plate 15A, dust accumulating around the light source 12A is suppressed. On the other hand, as the diffusion plate 15A diffuses the light radiated from the light source 12A, an irradiation range of the light on an irradiation surface (wall surface) can be expanded. Also, as the optical axis 120A of the light source 12A can be directed to the diffusion plate 15A and the irradiation surface, extension of light on the irradiation surface improves. Therefore, lighting efficiency improves.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a lighting device.

  Conventionally, as an illumination method, indirect illumination is known in which light from a light source is irradiated on a reflective diffusion surface such as a ceiling or a wall surface and is indirectly illuminated by the reflected light. Typical illumination methods of indirect illumination include cove illumination with a ceiling as a reflection diffusion surface and cornice illumination with a wall surface as a reflection diffusion surface. A conventional cove illumination illumination method is disclosed in, for example, Patent Document 1 (see FIG. 1 of Patent Document 1).

  Examples of conventional indirect illumination are shown in FIGS. 9 and 10. FIG. 9 is a diagram illustrating an installation example of a conventional cornice illumination lighting device 1X. In the example of FIG. 9, a feature 80X is provided in a recess provided in the ceiling 91X. Manufacture refers to a structure for mounting the lighting device. The feature 80X includes a bottom surface (ceiling surface 912X) of a recess provided in the ceiling 91X, a mounting portion 81X extending substantially horizontally with a space therebetween, and a light shielding portion 82X extending upward from an end portion of the mounting portion 81X. . On the mounting part 81X, the illuminating device 1X provided with the LED light source etc. is arrange | positioned. Further, the light shielding part 82X faces the wall surface 92X that is the irradiation target with a predetermined interval. Thereby, the light irradiated from the illuminating device 1X reflects in the structure 80X, and the reflected light irradiates the wall surface 92X. In FIG. 9, the intensity of light intensity at each position in the space outside the lighting device is conceptually shown in gray scale.

  FIG. 10 is a diagram illustrating an installation example of a conventional illumination device 1Y for cove illumination. In the example of FIG. 10, a structure 80Y having a mounting portion 81Y extending substantially horizontally with a space from the ceiling 91Y and a light shielding portion 82Y extending upward from the end of the mounting portion 81Y is provided. Moreover, the illuminating device 1Y provided with light sources, such as a LED light source, is arrange | positioned on the mounting part 81Y of the structure 80Y. Thereby, the light irradiated from the illumination device 1Y directly irradiates the ceiling 91Y, and the reflected light reflected in the structure 80Y irradiates the ceiling 91Y. In FIG. 10, the intensity of light intensity at each position in the space outside the lighting device is conceptually shown in gray scale.

JP 2014-145164 A

  As shown in FIGS. 9 and 10, the conventional lighting devices 1X and 1Y are placed on the structures 80X and 80Y, and thus there is a problem that dust accumulates on the structures 80X and 80Y.

  Further, in the conventional illumination devices 1X and 1Y, the direction of the optical axis is vertically upward. For this reason, in the illuminating device 1X, the direct light radiate | emitted in an optical axis direction is not irradiated to the wall surface 92X which is irradiation object. Therefore, the illumination efficiency is low. Moreover, in the illuminating device 1Y, the direct light emitted in the optical axis direction is irradiated only on the vicinity of the illuminating device 1Y in the ceiling 91Y that is the irradiation target. Therefore, the illumination efficiency is low.

  This invention is made | formed in view of such a situation, and it aims at providing the technique which can irradiate light to an irradiation surface efficiently while suppressing accumulation | storage of dust.

  In order to solve the above problems, a first invention of the present application is an illumination device for indirect illumination, comprising a light source and a housing having an internal space for housing the light source therein, and the housing is configured. At least a part of the outer wall is made of a light transmissive diffuser plate, and the light source is arranged so that the optical axis of the light source passes through the diffuser plate obliquely.

  2nd invention of this application is the illuminating device of 1st invention, Comprising: The haze value of the said cover is 80% or more, The light radiate | emitted from the said light source was directly or indirectly incident on the said diffuser plate In some cases, it diffuses to an angle different from the incident angle.

  A third invention of the present application is the illumination device according to the first invention or the second invention, wherein the illumination device irradiates light on a wall surface outside the device, and the diffusion plate is disposed to face the wall surface. The optical axis extends obliquely upward or obliquely downward from the light source.

  A fourth invention of the present application is the lighting device according to the first or second invention, wherein the lighting device irradiates light on a ceiling outside the device, and the diffusion plate is substantially perpendicular to the ceiling. The optical axis extends obliquely upward from the light source.

  A fifth invention of the present application is the illumination device according to any one of the first to fourth inventions, wherein the illumination device further includes a reflector disposed in the internal space, and the reflector is It arrange | positions substantially parallel with respect to the said optical axis of a light source.

  According to the first to fifth inventions of the present application, it is possible to suppress the accumulation of dust around the light source. Moreover, since the light from the light source is diffused by using a diffusion plate for the cover, the optical axis of the light source can be directed to the cover and the irradiation surface. Thereby, an irradiation surface can be irradiated efficiently and the elongation of light on the irradiation surface is improved.

  In particular, according to the second invention of the present application, the cover efficiently diffuses the light emitted from the LED light source. Therefore, the elongation of light on the irradiated surface is further improved. Further, even when a plurality of light sources are arranged in the horizontal direction, unevenness in the horizontal direction of light traveling from the irradiation device to the irradiation surface can be suppressed.

It is sectional drawing which showed the example of installation of the illuminating device which concerns on 1st Embodiment. It is a front perspective view of the illuminating device which concerns on 1st Embodiment. It is a back surface perspective view of the illuminating device which concerns on 1st Embodiment. It is sectional drawing of the illuminating device which concerns on 1st Embodiment. It is a front view of the illuminating device which concerns on 1st Embodiment. It is sectional drawing which showed the example of installation of the illuminating device which concerns on 2nd Embodiment. It is sectional drawing of the illuminating device which concerns on 2nd Embodiment. It is a side view of the illuminating device which concerns on 2nd Embodiment. It is sectional drawing which showed the example of installation of the illuminating device for the conventional cornice illumination. It is sectional drawing which showed the example of installation of the illuminating device for the conventional cove illumination. It is sectional drawing which showed the example of installation of the illuminating device which concerns on a modification. It is sectional drawing which showed the example of installation of the illuminating device which concerns on a modification. It is sectional drawing which showed the example of installation of the illuminating device which concerns on a modification.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

<1. First Embodiment / Cornis Lighting>
FIG. 1 is a cross-sectional view showing an installation example of the illumination device 1A according to the first embodiment of the present invention. The lighting device 1A is a lighting device for cornice lighting. As shown in FIG. 1, the ceiling 91A is provided with a ceiling recess 911A at the boundary with the wall surface 92A. The ceiling recess 911A is provided with a feature 80A. The feature 80A extends substantially horizontally at a distance from the ceiling surface 912A, which is the bottom of the ceiling recess 911A. The end portion on the wall surface 92A side of the structure 80A is disposed with a predetermined distance from the wall surface 92A. Although the structures 80X and 80Y for housing the conventional lighting devices 1X and 1Y shown in FIGS. 9 and 10 have the light shielding portions 82X and 82Y, the structure 80A does not need to have the light shielding portions. The lighting device 1A is accommodated in a construction space 800A sandwiched between the ceiling surface 912A and the construction 80A.

  The illuminating device 1A irradiates the wall surface 92A from above to below. In FIG. 1, an example of the brightness at each position in the space outside the lighting device 1A when the lighting device 1A is turned on is conceptually shown in gray scale.

  FIG. 2 is a front perspective view of the lighting device 1A. FIG. 3 is a rear perspective view of the lighting device 1A. FIG. 4 is a cross-sectional view of the lighting device 1A. FIG. 5 is a front view of the lighting device 1A. 1 and 4 are cross-sectional views taken along arrows A-A 'shown in FIG. FIG. 5 is a front view seen from the B-B ′ cross section shown in FIG. 4.

  As shown in FIGS. 2 and 3, the illumination device 1 </ b> A has a cover 15 </ b> A fitted into the opening of the housing 11 </ b> A on the outer surface. Moreover, 1 A of illuminating devices exhibit the external shape which the plate-shaped member protruded from the substantially rectangular parallelepiped box-shaped body. Moreover, as shown in FIG. 5, 1 A of illuminating devices are arrange | positioned so that the longitudinal direction may turn into the horizontal direction along ceiling 91A. FIG. 5 shows a state in which a plurality of lighting devices 1A are arranged in the longitudinal direction.

  As illustrated in FIG. 4, the lighting device 1A includes a housing 11A, a plurality of LED light sources 12A, a reflecting plate 13A, and a power source 14A. Below, about the direction regarding 1 A of illuminating devices, the wall surface 92A side made into irradiation object is demonstrated as a front direction, and the opposite side is demonstrated as a back direction.

  The housing 11A accommodates a plurality of LED light sources 12A inside. The housing 11A has an internal space 20A in which the LED light source 12A is accommodated. The housing 11A of the present embodiment includes a first member 111A, a second member 112A, and a cover 15A. The first member 111A and the second member 112A constitute the main body of the housing 11A. The first member 11A and the second member 112A are members constituting the outer walls of the upper surface, the lower surface, both side surfaces, and the back surface of the housing 11A.

  The first member 111A includes an upper cover holding portion 21A, a lower cover holding portion 22A, a light source arrangement portion 23A, a reflector plate arrangement portion 24A, a side wall portion 25A, and an upper plate portion 26A.

  The upper cover holding portion 21A has a groove portion that holds the upper end portion of the cover 15A. The lower cover holding portion 22A has a groove portion that holds the lower end portion of the cover 15A.

  The light source arrangement part 23A is a flat part that extends obliquely rearward and downward from the upper cover holding part 21A. The reflector arrangement part 24A is a flat plate-like part that extends obliquely rearward and upward from the lower cover holding part 22A.

  The side wall portion 25A constitutes outer walls on both side surfaces of the lighting device 1A. The upper plate portion 26A is a flat plate-like portion extending upward from the upper cover holding portion 21A. The upper plate portion 26A is fixed to a fixing member 113A for fixing the lighting device 1A and the ceiling 91A.

  The second member 112A is a member that covers the back of the first member 111A and constitutes the outer wall on the back surface of the lighting device 1A. Hereinafter, the space behind the first member 111A and in front of the second member 112A shown in FIG. 4 is referred to as a rear space 110A.

  The fixing member 113A is a member for fixing the lighting device 1A to the ceiling 91A. The fixing member 113A is a member extending in the longitudinal direction and having an L-shaped cross section as shown in FIG. The fixing member 113A includes a first fixing portion 27A that is disposed substantially horizontally along the ceiling 91A, and a second fixing portion 28A that extends downward from the front end portion of the first fixing portion 27A. The first fixing portion 27A is fixed to the ceiling 91A by a fixing tool such as a bolt. The second fixing portion 28A is disposed along the rear surface of the upper plate portion 26A, and is fixed to the upper plate portion 26A with screws or the like.

  Each of the LED light sources 12A is arranged on the lower surface of the light source arrangement portion 23A in the internal space 20A. Specifically, the substrate 121A is arranged along the lower surface of the light source arrangement portion 23A. The plurality of LED light sources 12A are arranged on the substrate 121A at substantially equal intervals in the horizontal direction along the longitudinal direction of the lighting device 1A. In this embodiment, 3 mm square, substantially square LED light sources are arranged at 11 mm intervals.

  In addition, each LED light source 12A is disposed in a position and orientation in the lighting apparatus 1A such that its optical axis 120A passes through the cover 15A from the LED light source 12A and extends obliquely downward toward the wall surface 92A. . By configuring in this way, the elongation of light on the wall surface 92A that is the object of irradiation is improved. Therefore, the illumination efficiency is improved.

  The reflector 13A is arranged along the front surface (upper surface) of the reflector arrangement portion 24A in the internal space 20A. The light diffusion angle of the LED light source 12A is about 120 °. That is, the light emitted from the LED light source 12A extends from the optical axis 120A to a range of about 60 °. The reflector 13A reflects part of the light emitted from the LED light source 12A toward the cover 15A. Further, the reflection plate 13A further reflects a part of the light reflected in the internal space 20A after being irradiated from the LED light source 12A.

  The reflection plate 13A is a flat plate-like member, and is disposed substantially parallel to the optical axis 120A of the plurality of LED light sources 12A. Thereby, the light irradiated from 12 A of LED light sources can be efficiently reflected toward the cover 15A side. In addition, the elongation of light on the wall surface 92A, which is the irradiation target, is further improved.

  The power source 14A is arranged in the rear space 110A along the rear surface of the reflector arrangement portion 24A. The power source 14A is electrically connected to the plurality of LED light sources 12A via the substrate 121A. When the lighting device 1A is driven, power is supplied from the power source 14A to the plurality of LED light sources 12A via the substrate 121A. Thereby, light is irradiated from each LED light source 12A.

  The cover 15A is a diffusing plate that has light transmittance and diffuses transmitted light. The cover 15A is fitted into an opening portion in the front direction of the main body portion of the housing 11A configured by the first member 111A and the second member 112A. Thus, the cover 15A constitutes an outer wall on the front surface of the housing 11A. Here, the arrangement of the lighting device 1A is preferably such that the front surface of the cover 15A is substantially vertically opposed to the wall surface 92A with a gap.

  In the illuminating device 1A configured as described above, the space in which the LED light source 12A is disposed is closed by being covered with the cover 15A. The lighting device 1A is accommodated in the construction space 800A. Thereby, it is suppressed that dust accumulates around the LED light source 12A and on the structure 80A.

  By using a diffusion plate for the cover 15A, the light emitted from the LED light source 12A is diffused by the cover 15A. Further, the optical axis 120A of the LED light source 12A is directed in a direction to reach the wall surface 92A that is an irradiation surface through the cover 15A. As a result, the light in the optical axis direction, which is the strongest light among the light emitted from the LED light source 12A, reaches the wall surface 92A without hitting a member other than the cover 15A and being weakened. For this reason, light can be efficiently irradiated onto the wall surface 92A, and the elongation of light on the wall surface 92A is improved. In addition, since the light hitting the cover 15A is diffused in a direction different from the optical axis, such as the direction of the ceiling 91A, it is possible to illuminate the direction different from the direction of the optical axis 120A. Moreover, even if it is a case where an in-room person looks directly at the light irradiated from 1 A of lighting apparatuses, it can suppress feeling dazzling.

  In the illuminating device 1A, the normal vector on the front surface of the cover 15A is directed horizontally forward. Here, if the normal vector on the front surface of the cover 15A is vertically upward, dust may accumulate on the cover 15A. In the present embodiment, since the normal vector on the front surface of the cover 15A is not vertically upward, dust accumulation on the cover 15A is suppressed.

  The normal vector on the front surface of the cover 15A may be obliquely downward. In this case, it is possible to further suppress the accumulation of dust on the cover 15A. However, when the normal vector on the front surface of the cover 15A is obliquely downward, the light emitted from the illuminating device 1A by the occupant may be more directly visible compared to the case where the normal vector is horizontal. Therefore, it is desirable to arrange the lighting device 1A in consideration of this.

  Further, the haze value indicating the diffusibility of the cover 15A in the lighting device 1A is about 96%. Thus, the haze value of the cover 15A is preferably 80% or more. By using a diffuser plate with high diffusibility as the cover 15A, the cover 15A efficiently diffuses the light emitted from the LED light source 12A. Therefore, it is possible to widen the light irradiation range on the wall surface 92A that is the irradiation target. As a result, the illumination efficiency is improved.

  In addition, when the haze value of the cover 15A is low, the plurality of LED light sources 12A are arranged at intervals, thereby causing unevenness in light intensity in the horizontal direction of light traveling from the illumination device 1A toward the wall surface 92A. By using a diffuser plate with high diffusibility as the cover 15A, it is possible to suppress unevenness in luminous intensity in the horizontal direction of light traveling from the lighting device 1A toward the wall surface 92A. Further, it is possible to realize uniform planar light emission that suppresses the so-called “crushing feeling” of the LED.

  The haze value of the cover 15A is more preferably 90% or more. By using a diffusing plate having higher diffusibility as the cover 15A, it is possible to further expand the light irradiation range on the wall surface 92A to be irradiated. Therefore, the illumination efficiency is further improved. Moreover, the unevenness of the luminous intensity in the horizontal direction of the light traveling from the lighting device 1A toward the wall surface 92A can be further suppressed.

  In the lighting device 1A, the total light transmittance of the cover 15A is about 85%. Thus, the total light transmittance of the cover 15A is preferably 80% or more. By using a highly transmissive diffuser plate as the cover 15A, the elongation of light on the wall surface 92A to be irradiated is improved. As a result, the illumination efficiency is further improved. As described above, as the cover 15A, it is desirable to use a diffusion plate with high transmission and high diffusion.

  Thus, in the illuminating device 1A, since illumination efficiency is high, the cross-sectional area of the optical path for the light in the construction space 800A to go to the wall surface 92A can be reduced. That is, the dimension in the height direction of the cover 15A, which is a portion through which light can pass between the inside and the outside of the created space 800A, can be reduced. Therefore, the dimension in the height direction from the upper surface of the structure 80A that houses the lighting device 1A to the ceiling surface 912A can be reduced.

<2. Second Embodiment / Cove Lighting>
FIG. 6 is a cross-sectional view showing an installation example of the lighting device 1B according to the second embodiment of the present invention. The lighting device 1B is a lighting device for cove lighting. As shown in FIG. 6, in the vicinity of the ceiling 91B, the structure 80B extends substantially horizontally from the ceiling 91B with a predetermined interval. Although the structures 80X and 80Y for housing the conventional lighting devices 1X and 1Y shown in FIGS. 9 and 10 have the light shielding portions 82X and 82Y, the structure 80B does not need to have the light shielding portions. The lighting device 1B is accommodated in a production space 800B sandwiched between the ceiling 91B and the production 80B.

  The illuminating device 1B irradiates the ceiling 91B from obliquely downward to obliquely upward. In FIG. 6, an example of the brightness at each position in the space outside the lighting device 1B when the lighting device 1B is in a lighting state is conceptually shown in gray scale.

  FIG. 7 is a cross-sectional view of the lighting device 1B. FIG. 8 is a front view of the lighting device 1B. 6 and 7 are cross-sectional views taken along the line C-C 'shown in FIG. FIG. 8 is a front view seen from the D-D ′ cross section shown in FIG. 7.

  As shown in FIGS. 6-8, the illuminating device 1B is installed along the ceiling 91B, and illuminates the ceiling 91B. The illuminating device 1B is arrange | positioned so that the longitudinal direction may turn into the horizontal direction along the ceiling 91B. FIG. 8 shows a state in which a plurality of lighting devices 1B are arranged in the longitudinal direction.

  As illustrated in FIG. 7, the lighting device 1B includes a housing 11B, a plurality of LED light sources 12B, a reflecting plate 13B, and a power source 14B. In addition, about the direction regarding the illuminating device 1B, the horizontal direction cover 15B side is demonstrated as a front direction, and the other side is demonstrated as a back direction.

  The casing 11B accommodates a plurality of LED light sources 12B inside. The housing 11B has an opening 201B into which the cover 15B is fitted on the front surface. The housing 11B includes an upper cover holding member 31B, a lower cover holding member 32B, a light source housing member 33B, a fixing member 34B, and a cover 15B. The upper cover holding member 31B, the lower cover holding member 32B, and the light source housing member 33B constitute a main body of the housing 11B. The main body of the housing 11B is a member constituting the outer walls of the top surface, the bottom surface, both side surfaces, and the back surface of the housing 11B.

  The upper cover holding member 31B has a groove for holding the upper end of the cover 15B. The lower cover holding member 32B has a groove that holds the lower end of the cover 15B.

  The light source housing member 33B includes an upper plate portion 331B extending rearward from the upper cover holding member 31B, a lower plate portion 332B extending rearward from the lower cover holding member 32B, a rear end portion of the upper plate portion 331B, and a lower plate portion 332B. And a bottom plate portion 333B that connects the rear end portion of the upper and lower portions. Further, both ends in the longitudinal direction of the light source housing member 33B are covered with the side plate portion 334B.

  As shown in FIG. 7, the fixing member 34B is a member having a U-shaped cross section. The fixing member 34B includes a first fixing portion 341B disposed substantially horizontally along the ceiling 91B, a second fixing portion 342B extending downward from the front end portion of the first fixing portion 341B, and a lower end portion of the second fixing portion 342B. And a third fixing portion 343B extending substantially horizontally from the rear to the rear. The first fixing portion 341B and the third fixing portion 343B are fixed to the ceiling 91B by a fixing tool such as a bolt. The second fixing portion 342B is disposed along the rear surface of the bottom plate portion 333B of the light source housing member 33B, and is fixed to the bottom plate portion 333B by screwing or the like.

  Each of the LED light sources 12B is disposed in the internal space 20B of the housing 11B. Specifically, the light source mounting plate 35B is disposed below the internal space 20B. And the LED light source 12B is arrange | positioned on this light source mounting board 35B. The plurality of LED light sources 12B are arranged at substantially equal intervals in the horizontal direction along the longitudinal direction of the lighting device 1B. In this embodiment, 3 mm square substantially square LED light sources 12 </ b> B are arranged at intervals of 11 mm. In the present embodiment, the optical axis 120B of the LED light source 12B extends obliquely upward from the LED light source 12B through the cover 15B toward the ceiling 91B. In the present embodiment, the angle of the optical axis 120B of the LED light source 12B with respect to the vertical direction is about 25 °.

  Moreover, each LED light source 12B is arrange | positioned in the illuminating device 1B in the position and direction which the optical axis 120B passes through the cover 15B from LED light source 12B, and extends toward diagonally upward toward the ceiling 91B. The By setting it as such a structure, the elongation of the light in the ceiling 91B which is irradiation object becomes good. Therefore, the illumination efficiency is improved.

  The reflector 13B is disposed in the internal space 20B of the housing 11B. The reflector 13B extends upward and forward from the vicinity of the LED light source 12B. The reflector 13B reflects part of the light emitted from the LED light source 12B toward the cover 15B. Moreover, the reflecting plate 13B further reflects a part of the light reflected in the internal space 20B after being irradiated from the LED light source 12B.

  The inclination of the reflection plate 13B changes stepwise. The reflection plate 13B includes a first reflection part 131B, a second reflection part 132B, and a third reflection part 133B having different inclinations. Each of the first reflecting portion 131B, the second reflecting portion 132B, and the third reflecting portion 133B has a flat plate shape. In addition, the 1st reflection part 131B, the 2nd reflection part 132B, and the 3rd reflection part 133B are not restricted to flat form, You may curve in the limit which can implement | achieve desired light distribution.

  The first reflecting portion 131B extends substantially vertically. The lower end portion of the first reflecting portion 131B is disposed near the rear end portion of the light emitting surface 121B of the LED light source 12B. The second reflecting portion 132B extends upward and forward from the upper end portion of the first reflecting portion 131B. The inclination angle of the second reflecting portion 132B with respect to the vertical direction is about 15 °. The third reflecting portion 133B extends upward and forward from the upper end portion of the second reflecting portion 132B. The upper end portion of the third reflecting portion 133B is disposed in the vicinity of the upper cover holding member 31B. The inclination angle of the third reflecting portion 133B with respect to the vertical direction is about 30 °. Thus, the angle formed by the reflecting plate 13B and the cover 15B of the present embodiment increases as the distance between the LED light source 12B and the reflecting plate 13B increases.

  Here, in FIG. 8, the brightness of the cover 15B when the cover 15B is viewed from the front is shown in gray scale. By changing the inclination of the reflecting plate 13B stepwise, when the cover 15B is viewed from the front, a gradation is formed in which the brightness of the cover 15B gradually decreases from the bottom to the top. That is, as viewed from the room occupants below the lighting device 1B, the brightness of the cover 15B forms a gradation that decreases as the distance from the line of occupants increases. Thereby, even if it is a case where the illuminating device 1B can be visually observed from a room occupant, while a dazzling feeling is suppressed, the beauty of the external appearance of the illuminating device 1B seen from the room occupant improves.

  The power source 14B is disposed behind the reflector 13B. Specifically, the power source 14B is fixed to the front side of the bottom plate portion 333B of the light source housing member 33B. The power source 14B is electrically connected to the plurality of LED light sources 12B. When the lighting device 1B is driven, power is supplied from the power source 14B to the plurality of LED light sources 12B. Thereby, light is irradiated from each LED light source 12B.

  The cover 15B is fitted into the opening 201B on the front surface of the main body of the housing 11B. Thereby, the cover 15 </ b> B constitutes an outer wall in front of the lighting device 1. The cover 15B is a diffusing plate that has light transmittance and diffuses transmitted light. The illumination device 1B is preferably arranged so that the front surface of the cover 15B is substantially perpendicular to the horizontal direction.

  In the illuminating device 1B, the space in which the LED light source 12B is arranged is closed by being covered with the cover 15B. Moreover, the illuminating device 1B is accommodated in the construction space 800B. Thereby, it is suppressed that dust accumulates on the circumference | surroundings of LED light source 12B, or on the structure 80B.

  Further, by using a diffusion plate for the cover 15B, the light emitted from the LED light source 12B is diffused by the cover 15B. Further, the optical axis 120B of the LED light source 12B is directed in the direction reaching the ceiling 91B, which is the irradiation surface, through the cover 15B. As a result, the light in the optical axis direction, which is the strongest light among the light emitted from the LED light source 12B, hits the members other than the cover 15B and reaches the ceiling 91B without being weakened. For this reason, light can be efficiently applied to the ceiling 91B, and the elongation of light on the ceiling 91B is improved. Further, since the light hitting the cover 15B is diffused in a direction different from the optical axis, it is possible to illuminate a direction different from the direction of the optical axis 120B. Moreover, even if it is a case where an in-room person looks directly at the light irradiated from the illuminating device 1B, it can suppress feeling dazzling.

  In the lighting device 1B, the normal vector on the front surface of the cover 15B is horizontally forward. Here, if the normal vector on the front surface of the cover 15B is vertically upward, dust may accumulate on the cover 15B. In the present embodiment, since the normal vector on the front surface of the cover 15B is not vertically upward, dust accumulation on the cover 15B is suppressed.

  Further, the normal vector on the front surface of the cover 15B may be obliquely downward. In this case, it is possible to further suppress the accumulation of dust on the cover 15B. However, when the normal vector on the front surface of the cover 15B is obliquely downward, the light emitted from the lighting device 1B may be more directly visible by the occupant compared to the case where the normal vector is horizontal. Therefore, it is desirable to arrange the lighting device 1B in consideration of this.

  Moreover, the haze value which shows the diffusibility of the cover 15B in the illuminating device 1B is about 96%. Thus, the haze value of the cover 15B is preferably 80% or more. By using a diffuser plate with high diffusibility as the cover 15B, the cover 15B efficiently diffuses the light emitted from the LED light source 12B. Therefore, it is possible to widen the light irradiation range on the ceiling 91B that is the irradiation target. As a result, the illumination efficiency is improved.

  In addition, when the haze value of the cover 15B is low, the plurality of LED light sources 12B are arranged at intervals, thereby causing unevenness in luminous intensity in the horizontal direction of light traveling from the lighting device 1B to the ceiling 91B. By using a diffuser plate with high diffusibility as the cover 15B, it is possible to suppress unevenness in luminous intensity in the horizontal direction of light traveling from the lighting device 1B to the ceiling 91B. Further, it is possible to realize uniform planar light emission that suppresses the so-called “crushing feeling” of the LED.

  The haze value of the cover 15B is more preferably 90% or more. By using a diffusing plate having higher diffusibility as the cover 15B, it is possible to further widen the light irradiation range on the wall surface 92B to be irradiated. Therefore, the illumination efficiency is further improved. In addition, it is possible to further suppress unevenness in luminous intensity in the horizontal direction of light traveling from the lighting device 1B to the ceiling 91B.

  In the lighting device 1B, the total light transmittance of the cover 15B is about 85%. Thus, the total light transmittance of the cover 15B is preferably 80% or more. Thus, by using a highly transmissive diffuser plate as the cover 15B, the elongation of light on the wall surface 92B to be irradiated is improved. As a result, the illumination efficiency is further improved. As described above, as the cover 15B, it is desirable to use a diffusion plate with high transmission and high diffusion.

  In the conventional illumination device 1Y for cove illumination shown in FIG. 10, the portion where light can pass between the inside and the outside of the space sandwiched between the structure 80Y and the ceiling 91Y is the upper end of the light shielding portion 82Y and the ceiling 91Y. Between. For this reason, the height of the portion through which light can pass between the inside and the outside of the space sandwiched between the structure 80Y and the ceiling 91Y is smaller than the interval between the placement portion 81Y and the ceiling 91Y.

  On the other hand, in the present embodiment, the cover 15B can be disposed in almost the entire vertical direction of the construction space 800B. Therefore, the dimension in the height direction of the structure space 800B for installing the lighting device 1B of the present embodiment is smaller than the distance in the height direction between the structure 80Y for installing the conventional lighting device 1Y and the ceiling 91Y. it can.

  Furthermore, since the illumination device 1B has high illumination efficiency, it is possible to reduce the cross-sectional area of the optical path for the light in the created space 800B to go to the ceiling 91B. That is, the dimension in the height direction of the cover 15B, which is a portion through which light can pass between the inside and outside of the construction space 800B, can be further reduced.

<3. Modification>
As mentioned above, although main embodiment of this invention was described, this invention is not limited to said embodiment.

  The lighting device 1A for cornice illumination according to the first embodiment is installed in the vicinity of the ceiling 91A and irradiates the wall surface 92A from above. However, the present invention is not limited to this, and a position that provides an effect for cornice illumination. It will be enough if it is arranged in. For example, as in the example of FIG. 11, the wall surface may be irradiated from below near the floor surface.

  FIG. 11 is a cross-sectional view showing an installation example of an illumination device 1C for cornice illumination according to a modification. This illuminating device 1C is installed in the vicinity of the floor surface 93C, and irradiates the wall surface 92C from below to above.

  In addition, in the lighting device 1A according to the first embodiment described above and the lighting device 1C according to the modification, the structure and the lighting device are arranged in the vicinity of the end portion in the vertical direction of the wall surface. It is not limited, and it is sufficient if it is arranged at a position where an effect for cornice illumination is produced. For example, as in the example of FIG. 12, the feature and lighting device may be arranged at any position in the vertical direction of the wall surface.

  FIG. 12 is a cross-sectional view illustrating an installation example of an illumination device 1D for cornice illumination according to another modification. This illuminating device 1D is accommodated in the construction space 800D arrange | positioned near the approximate center of the up-down direction of wall surface 92D. For this reason, this illuminating device 1D irradiates the wall surface 92D downward from the vicinity of the approximate center in the vertical direction.

  Moreover, although the illuminating device which concerns on said embodiment and a modification irradiates light to a ceiling and a wall surface, this invention is not limited to this. The lighting device of the present invention may be an indirect lighting device that irradiates a floor surface as in the example of FIG.

  FIG. 13: is sectional drawing which showed the example of installation of the illuminating device 1E for indirect illumination which concerns on another modification. This illuminating device 1E is an illuminating device for foot indirect illumination which is installed along the floor surface 93E and irradiates the floor surface 93E.

  Moreover, in said embodiment, although the LED light source is used as a light source, this invention is not limited to this. You may use other light sources, such as a fluorescent lamp, as a light source. Moreover, in said embodiment, although several LED light source is arrange | positioned in 1 row, this invention is not limited to this. A plurality of LED light sources may be arranged in a plurality of rows. A plurality of LED light sources may be alternately arranged in two rows. Moreover, the magnitude | size and arrangement | positioning space | interval of the LED light source shown by said embodiment are examples, and are not restricted to this.

  Moreover, you may combine arbitrarily each element which appeared in said each embodiment and modification in the range which does not produce inconsistency.

1A, 1B, 1C, 1D, 1E, 1X, 1Y Illuminator 11A, 11B Case 12, 12A, 12B LED light source 12X, 12Y Light source 13A, 13B Reflector 15A, 15B Cover 20A, 20B Internal space 80A, 80B, 80X , 80Y Production 91A, 91B, 91X, 91Y Ceiling 92A, 92B, 92C, 92D, 92X Wall surface 93C, 93E Floor surface 120A, 120B Optical axis 201B Opening

Claims (5)

A lighting device for indirect lighting,
A light source;
A housing having an internal space for accommodating the light source;
With
At least a part of the outer wall constituting the housing is composed of a light diffusing plate,
The illuminating device, wherein the light source is arranged so that an optical axis of the light source passes obliquely through the diffusion plate. The haze value of the cover is 80% or more,
The diffuser diffuses at an angle different from the incident angle when light emitted from the light source is directly or indirectly incident.
The lighting device according to claim 1. The lighting device irradiates light on a wall surface outside the device,
The diffusion plate is disposed to face the wall surface,
The optical axis extends obliquely upward or obliquely downward from the light source.
The lighting device according to claim 1. The lighting device irradiates light on the ceiling outside the device,
The diffusion plate is disposed substantially perpendicular to the ceiling,
The optical axis extends obliquely upward from the light source.
The lighting device according to claim 1. The lighting device includes:
A reflector further disposed in the internal space;
The reflector is disposed substantially parallel to the optical axis of the light source;
The lighting device according to any one of claims 1 to 4.