JP2012243680A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system capable of attaining uniform light distribution by preventing reduction of luminous flux.SOLUTION: The lighting system has an unevenness part 41 formed in a portion near the installation surface side of the lighting system body in the side 40b of a light guide body 40. When emission light from the light source module 20 enters into an area where the unevenness part 41 is formed, it is refracted (scattered) by the unevenness part 41. Thereby, the light refracted by the unevenness part 41 is emitted toward the dark space near the light source module 20.

Description

  The present invention relates to an illuminating device that can prevent a reduction in luminous flux and realize uniform light distribution.

  LEDs (Light Emitting Diodes) are being adopted as light sources for lighting devices because they have advantages such as long life and low power consumption. Various lighting devices using LEDs as light sources are attracting attention as the next-generation energy-saving lighting that is kind to the earth.

  For example, Patent Literature 1 discloses a lighting fixture (ceiling light) including an LED as a light source. The lighting fixture of patent document 1 is improving brightness | luminance unevenness and improving fixture efficiency. Specifically, the lighting fixture of patent document 1 is provided with the milky white illumination cover (glove) which covered the light source module. And in order to reduce the brightness nonuniformity which arises in the outer edge part of an instrument main body, the thickness of the illumination cover is made nonuniform. That is, the outer edge portion of the lighting cover that needs countermeasures against luminance unevenness is thickened, and the central portion of the lighting cover that needs to have high transmittance is thinned.

JP 2008-300203 A (released on December 11, 2008)

  As described above, the lighting fixture of Patent Document 1 realizes uniform light distribution as a whole lighting fixture by changing the thickness of the lighting cover. In other words, in the lighting apparatus of Patent Document 1, a lighting cover is indispensable. Therefore, the lighting fixture of patent document 1 cannot implement | achieve uniform light distribution, if there is no lighting cover.

  Thus, in the lighting fixture of the said patent document 1, since the light from a light source module is absorbed by the illumination cover for obtaining uniform light distribution, there exists a problem that the light beam which can be utilized as illumination light reduces.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an illuminating device that can prevent a reduction in luminous flux and realize uniform light distribution.

  In order to solve the above-described problems, an illumination device according to the present invention includes at least one light source, an illumination device body including the light source, a reflection unit that reflects light emitted from the light source, and the light source. It is characterized by comprising a light distribution control means for emitting a part of the emitted light to the vicinity of the light source of the reflecting portion.

  According to the above invention, the light distribution control means causes a part of the light emitted from the light source to be emitted near the light source. Thereby, a part of the emitted light from the light source is irradiated to the dark part generated in the vicinity of the light source in the reflection part of the illuminating device main body. As a result, the dark part is brightened by the light from the light source. Therefore, uniform light distribution can be realized. Therefore, in the conventional ceiling light, it is not necessary to use a glove which is essential for realizing a uniform light distribution. Therefore, it is possible to prevent the luminous flux that can be used as illumination light from being reduced by the luminous flux being absorbed by the globe.

  The illuminating device of the present invention preferably includes a light guide that accommodates the light source and emits light from the light exit surface while guiding light emitted from the light source incident on the light source.

  According to said invention, a light source is accommodated in a light guide, and a light source is covered with a light guide. This can prevent the user from touching the light source. That is, the light source can be protected. Moreover, according to said invention, the emitted light from a light source can be light-guided inside a light guide, and the output surface of a light guide can be made to shine.

  In the illumination device of the present invention, the light distribution control means may be provided on a surface of the light guide that faces the light source.

  According to said invention, the light distribution control means is provided integrally with the light guide. Therefore, the number of parts of the lighting device can be reduced.

In the illumination device of the present invention, a light scattering pattern that scatters and emits light propagating through the light guide is provided on the exit surface of the light guide or the opposite surface thereof,
The light scattering pattern preferably has a higher pattern density as it moves away from the light source.

  According to said invention, the pattern density of a light-scattering pattern is high as it leaves | separates from a light source. Thereby, by making the pattern density “sparse” on the side closer to the light source with a large amount of light, the amount of light emitted at the portion close to the light source can be suppressed. Further, by increasing the pattern density as the distance from the light source increases, the light can be uniformly emitted from the emission surface of the light guide.

  In the illuminating device of the present invention, it is preferable that a reflective member that reflects the leaked light from the opposite surface and re-enters the light guide is provided on the surface opposite to the exit surface of the light guide. .

  According to said invention, the reflection member is provided in the surface side opposite to the output surface of a light guide. As a result, even if light leaks from the surface opposite to the exit surface of the light guide in the middle of guiding the inside of the light guide, the leaked light is reflected by the reflecting member and reenters the light guide. It becomes possible.

  The illumination device of the present invention may include an optical element arranged to face the light source, and the light distribution control means may be provided in the optical element.

  According to the above invention, the light distribution control means is provided integrally with the optical element provided to face the optical path of the light source. Therefore, the number of parts of the lighting device can be reduced.

  According to the present invention, there is an effect that it is possible to provide an illuminating device that can prevent a reduction in luminous flux and realize uniform light distribution.

It is sectional drawing which shows the illuminating device which concerns on one Embodiment of this invention, and its partial enlarged view, and is a figure which shows the cross section of a perpendicular direction with respect to the installation surface of an illuminating device. It is the top view which looked at the illuminating device which concerns on one Embodiment of this invention from the light-projection surface side. It is a top view by the side of the output surface of the light source module in the said illuminating device. It is a figure which shows the light guide in the said illuminating device, (a) is a top view of the light guide seen from the output surface side, (b) is the installation surface of the illuminating device 1 in the light guide of (a). It is sectional drawing of a perpendicular direction with respect to it, (c) is a side view of a light guide. It is a top view of the light guide seen from the outgoing radiation side in the above-mentioned illuminating device. It is a top view which shows the dark part formed in the said illuminating device. It is sectional drawing which shows the example which changes the light-projection direction of a light source module with an optical lens in the said illuminating device. It is sectional drawing which shows the example which changes the light emission direction of a light source module with the LED board curved in the said illuminating device.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a plan view of the illumination device 1 according to the present invention as seen from the light emitting surface side. The illuminating device 1 of this embodiment is a ceiling light attached to a ceiling. As shown in FIG. 2, the lighting device 1 includes a lighting device body 10, a plurality (four in FIG. 2) of light source modules (light sources) 20, an optical lens (optical member) 30, and a light guide 40. Has been. In addition, in FIG. 2, the reflective sheet 50 mentioned later is abbreviate | omitted for description. In the following description, for the sake of convenience, the indoor (floor) side will be described as “lower (lower side)” and the ceiling (mounting surface) side will be described as “upper (upper side)”.

  The illuminating device main body 10 includes a chassis 11 installed on a mounting surface such as a ceiling, a frame body 12 provided on an outer edge portion of the chassis 11, and a protruding member 13 protruding from the chassis 11 toward the room (floor) side. It is configured.

  In the lighting device 1, the outer shape of the chassis 11 has a shape in which each side of the quadrangle and each corner are rounded. The outer shape of the chassis 11 is not particularly limited, and various shapes and sizes such as a circle and a polygon are allowed according to the appearance and preference. An opening 14 is formed at the center of the chassis 11. A rosette (not shown) attached to the ceiling is inserted into the opening 14. The chassis 11 also functions as a reflection unit that reflects the light emitted from the light source module 20.

  The frame 12 is formed over the entire outer edge of the chassis 11. The frame 12 reflects the emitted light from the light source module 20 to at least one of the floor side and the ceiling side. That is, the light reflected by the frame 12 can be used as direct illumination or can be used as indirect illumination. The frame body 12 is not particularly limited as long as it has a function of reflecting or scattering incident light. For example, the frame 12 may be an uneven surface (a rough surface subjected to blasting), or may be a reflective sheet such as a metal film.

  The protruding member 13 is fixed to the central portion of the chassis 11. The protruding member 13 is hollow, and an electronic component (not shown) such as a power supply circuit unit is accommodated therein. A light source module 20 is installed on the outer surface of the protruding member 13. In the lighting device 1, the protruding member 13 protrudes from the center of the lower surface (surface facing the floor) of the chassis 11. The protruding member 13 has a rectangular cross-sectional shape perpendicular to the installation surface of the lighting device 1. However, the shape of the protruding member 13 is not limited to this, and the cross-sectional shape in the direction perpendicular to the installation surface of the lighting device 1 is a polygon other than a quadrangle such as a semicircular shape, a semielliptical shape, and a triangular shape. It doesn't matter. Further, the shape of the chassis 11 and the shape of the protruding member 13 may be the same or different. That is, the projecting member 13 is not intended to have only a convex shape having a quadrangular cross-section in the direction perpendicular to the installation surface of the lighting device 1, and stores electronic components and the like, and the light source module 20 outside. As long as it has a function capable of being installed, various shapes and sizes are allowed. In addition, it is preferable that the protrusion member 13 is formed from a material with high heat dissipation. For example, the protruding member 13 can be made of aluminum, iron, resin, or the like. Thereby, it is possible to efficiently dissipate heat generated from the light source module 20 installed on the outer surface of the protruding member 13. The surface of the protruding member 13 may be painted white. Thereby, the light which reached | attained the surface of the protrusion member 13 can be reflected.

  The light source module 20 is installed along the outer surface of the protruding member 13. In the lighting device 1, the protruding member 13 has a quadrangular cross-sectional shape in a direction parallel to the installation surface of the lighting device 1. For this reason, in the illuminating device 1, the four light source modules 20 are arrange | positioned on each square side. That is, according to the cross-sectional shape of the protruding member 13 (the cross-sectional shape in the direction parallel to the installation surface of the lighting device 1), the plurality of light source modules 20 are arranged on each side of the polygon.

  FIG. 3 is a plan view of the light emitting module 20 on the light exit surface side. As shown in FIG. 3, the light source module 20 includes an LED substrate 21 and a plurality of LEDs 22 a and 22 b mounted on the LED substrate 21. The LEDs 22a and 22b emit light in a direction perpendicular to the mounting surface of the LED substrate 21. In FIG. 3, the white LED 22 a and the light bulb color LED 22 b are mounted on the LED substrate 21. Thereby, the illuminating device 1 can illuminate white, a light bulb color, and those mixed colors. In FIG. 3, the white LEDs 22a and the bulb-colored LEDs 22b are provided at the same number and the same pitch, respectively. However, the LED mounted on the LED substrate 21 is not limited to this. That is, single color LEDs may be mounted on the LED substrate 21, or LEDs of different colors may be mounted at different pitches. Also, the number of LEDs can be arbitrarily set. In the following description, when the colors of the LEDs are not distinguished from each other, they are simply described as the LEDs 22.

  The optical lens 30 is provided on the optical path of the light source module 20 so as to face the light source module 20. In the illumination device 1, the optical lens 30 is provided for each light source module 20. That is, in the lighting device 1, four optical lenses 30 (the light source module 20 and the optical lens 30 are 1: 1) are provided for the four light source modules 20. That is, the optical lens 30 is a long lens formed along the longitudinal direction of the light source module 20 (the arrangement direction of the LEDs 22a and 22b). However, the optical lens 30 is not limited to this, and the optical lens 30 may be provided for each LED 22 of the light source module 20. The optical lens 30 is provided in the light emission direction of the light source module 20 and changes the emission direction or the emission angle of the emission light of the light source module 20. The shape and type of the optical lens 30 are not particularly limited. For example, various optical elements such as a convex lens and a Fresnel lens can be applied. Details of the optical lens 30 will be described later.

  The light guide 40 houses the illumination device main body 10, the light source module 20, and the optical lens 30. That is, the illumination device main body 10, the light source module 20, and the optical lens 30 are covered with the light guide 40. Thereby, it is possible to prevent the user from touching the light source module 20 and the optical lens 30. That is, the light source module 20 and the optical lens 30 can be protected.

  The light guide 40 has a function of transmitting the light emitted from the light source module 20 emitted through the optical lens 30 and faces the room (floor) while guiding the light emitted from the light source module 20 incident on the inside. And a function of emitting light from the emitting surface 40a. The light guide 40 is formed of a transparent resin such as an acrylic resin such as PMMA (polymethyl methacrylate) or a PC (polycarbonate) resin. The light guide 40 is completely different in function and color from the milky white glove that is essential for diffusing light in a conventional ceiling light. In other words, the lighting device 1 has a characteristic configuration that is different from the conventional ceiling light in that it does not include the globe.

  4A and 4B are diagrams showing the light guide 40, FIG. 4A is a plan view of the light guide 40 viewed from the emission surface 40a side, and FIG. 4B is a lighting device 1 in the light guide 40 of FIG. FIG. 4C is a cross-sectional view perpendicular to the installation surface of FIG. As shown in each drawing of FIG. 4, in the light guide 40, the exit surface 40a is thicker than the side surface 40b. Further, what is characteristic is that an uneven portion 41 (a rough surface subjected to blasting) is formed on a portion of the side surface 40b (outer surface) of the light guide 40 that is close to the ceiling side (installation surface side). Yes.

  On the other hand, FIG. 5 is a plan view of the light guide 40 as viewed from the emission surface 40a side. As shown in FIG. 5, a texture pattern is formed on the light exit surface 40 a of the light guide 40 so that the light emitted from the light source module 20 guided into the light guide 40 is uniformly emitted from the light exit surface 40 a. ing. The embossed pattern is a light scattering pattern that scatters and emits light inside the light guide 40, and controls the amount of light emitted from the exit surface 40 a of the light guide 40. Specifically, the light traveling through the interior of the light guide 40 while repeating total reflection hits the embossed pattern provided on the exit surface 40a of the light guide 40 to change the traveling angle. Thereby, the total reflection condition is broken, and light is emitted from the emission surface 40 a of the light guide 40.

  In FIG. 5, spherical surfaces (concave shape) having a diameter of 0.5 mm are formed at predetermined intervals (predetermined density) as embossed patterns on the emission surface 40 a of the light guide 40. The pattern density of the embossed pattern increases as the distance from the light source module 20 increases (that is, toward the center of the exit surface 40a). In other words, the pattern density is set with steps (gradation) from sparse to dense so that it is “sparse” on the side closer to the light source module 20 and “dense” on the side farther from the light source module 20. In the example of FIG. 5, the pattern density is the most “rough (maximum embossed spacing)” in the A1 region at the outer edge of the exit surface 40a, and approaches the A4 region at the center of the exit surface 40a. In this order, the density becomes “dense (texture interval“ small ”)”, and the most “dense (texture interval is minimum)” in the A4 area in the center. In this way, by setting the pattern density to “sparse” on the side closer to the light source module 20 with a large amount of light, the amount of light emitted at a portion close to the light source module 20 can be suppressed. And it can radiate | emit uniformly from the output surface 40a by raising a pattern density as it leaves | separates from the light source module 20. FIG.

  As a method for forming a wrinkle pattern (light scattering pattern), a light emitting surface 40a of the light guide 40 is formed to be uneven by heating a die or the like having unevenness on the surface and pressing it against the surface of the light guide 40. There are various methods such as a method and a method of printing a plurality of dots on the surface of the light guide 40 using a paint such as white.

  If the unevenness is formed on the surface, the pattern density is adjusted by changing the size of the protrusions in the mold, the distance between the protrusions, or both. In the case of printing dots, the dot diameter, the dot pitch, or both are changed. In the case of dots, the light scattering pattern is “dense” as the dot diameter is larger and the dot pitch is smaller, and the light scattering pattern is “sparse” as the dot diameter is smaller and the dot pitch is wider. . In addition, the light scattering pattern can be provided on either the emission surface 40a of the light guide 40 and the opposite surface (the surface on the ceiling side), or may be provided on both.

  Here, based on FIG. 1, the path | route of the emitted light of the light source module 20 in the illuminating device 1 is demonstrated. FIG. 1 is a cross-sectional view of the illuminating device 1 and a partially enlarged view thereof, and is a view showing a cross section in a direction perpendicular to the installation surface of the illuminating device 1. As shown in FIG. 1, the light emitted from the light source module 20 has its emission direction (emission angle) changed by the optical lens 30. That is, the light emitted from the light source module 20 travels mainly through the optical path R1, the optical path R2, and the optical path R3.

  Specifically, as shown as the optical path R1, a part of the light emitted from the light source module 20 is incident on the side surface 40b of the light guide 40 facing the optical lens 30 (light source module 20). When light emitted from the light source module 20 is incident on a flat region on the side surface 40b of the light guide 40 where the uneven portion 41 is not formed, the light is transmitted without being refracted (substantially straight).

  Further, as shown by the optical path R <b> 2, when the emitted light from the light source module 20 enters the region where the uneven portion 41 of the side surface 40 b of the light guide 40 is formed, the light is refracted (scattered) by the uneven portion 41. The light transmitted through the side surface 40b of the light guide 40 via the optical path R1 and the optical path R2 is reflected by the chassis 11 and the frame body 12, and the room is illuminated as direct illumination.

  On the other hand, a step that is thicker than the ceiling side is formed in a portion of the side surface 40b of the light guide 40 close to the indoor side. As indicated by the optical path R3, when the light emitted from the light source module 20 reaches the inclined surface 40c formed at this step, the light is reflected by the inclined surface 40c toward the emission surface 40a. Further, the light reflected by the inclined surface 40c is reflected by the edge portion 40d of the emission surface 40a and guided in the in-plane direction of the emission surface 40a. Thus, the light incident on the light guide 40 is guided through the inside of the light guide 40 toward the center of the exit surface 40a of the light guide 40 while repeating total reflection. When the total reflection condition is broken in the process of guiding light, light is emitted from the emission surface 40a. Note that the function of making the emission surface 40a shine is not essential in the lighting device 1. In the illuminating device 1, the reflective sheet (reflective member) 50 is provided between the surface opposite to the emission surface 40a of the light guide 40 and the surface of the protruding member 13 parallel to the surface. Thereby, even if light leaks from the surface opposite to the emission surface 40 a while light is guided through the inside of the light guide 40, the leaked light is reflected by the reflection sheet 50 and is incident on the light guide 40 again. It becomes possible. The LED substrate 21 and the optical lens 30 are fixed to a support member 23 installed on the side surface of the protruding member 13. In addition, when the light source module 20 is provided with LED of a different color (white LED22a, light bulb color LED22b), it is preferable that the optical lens 30 and the side surface 40b of the light guide 40 are provided apart. Thereby, it is possible to emit light having a sufficiently mixed color between the optical lens 30 and the side surface 40b of the light guide body 40.

  Thus, in the illumination device 1, the light emitted from the light source module 20 is emitted through the optical lens 30 and the light guide 40. Thereby, emitted light is reflected by the illuminating device main body 10 (chassis 11, frame 12), and the room is illuminated as direct illumination. Moreover, the light reflected on the ceiling side (installation surface side) by the frame 12 illuminates the ceiling as indirect illumination. In addition, if the frame 12 has a light scattering function that scatters the light emitted from the light source module 20, the light emitted from the light source module 20 can be refracted and used as direct illumination and / or indirect illumination. .

  The illumination device 1 is characteristic in that it does not include a glove that is essential in a conventional ceiling light. However, as shown in FIG. 6, it has been found that in the lighting device 1, dark portions are mainly formed in two regions. FIG. 6 is a plan view showing a dark part formed in the illumination device 1. Specifically, among the light source modules 20 arranged so as to form a quadrangle, a dark part D1 generated between two light source modules 20 and 20 adjacent to each other and a dark part D2 generated in the vicinity of each light source module 20 include an illumination device. 1 is formed.

  In the dark part D1, the light source module 20 having a light source having a high directivity and a narrow light emission angle compared to a fluorescent lamp or the like such as an LED is disposed on the chassis 11 so as to form a polygon such as a quadrangle or a hexagon. When light is emitted from the inside of the chassis 11 toward the outside from the inside of the chassis 11, the light reaches the apex of the polygon, that is, the outside direction between the adjacent light source modules 20 and 20. The light is not sufficiently emitted, and is generated as a dark portion in the region indicated by D1 of the chassis 11.

  Further, the dark portion D2 emits light from the light source module 20 having a light source having a high directivity and a light emission angle narrower than that of a fluorescent lamp or the like, substantially parallel to the surface of the chassis 11, and the like. When light is emitted from the inside of the chassis 11 to the outside, the amount of light emitted from the vicinity of the light source module 20 of the chassis 11 is smaller than that of a portion separated from the light source module 20, and thus the region indicated by D <b> 2 of the chassis 11. This occurs as a dark part.

  Therefore, in the lighting device 1, a measure for brightening the dark portions D1 and D2 is taken. Thereby, since the illuminating device 1 can radiate | emit light uniformly from the chassis 11 without using a glove | globe, it prevents the reduction | decrease of the light beam by an emitted light permeate | transmitting a glove | globe, and implement | achieves uniform light distribution It becomes possible to do. Hereinafter, a countermeasure for brightening the dark part D1 and the dark part D2 will be described in detail.

(1) Measures for brightening the dark part D1 In order to brighten the dark part D1, the lighting device 1 includes a correction unit that corrects the dark part D1 with light from the light source module 20. This correction means is not particularly limited as long as it has a function of directing the light emission direction of the light source module 20 toward the dark part D1. For example, as a correction method of the dark part D1 by this correction means, there are a method of changing the light emission direction of the light source module 20 by the optical lens 30, and a method of bending the LED substrate 21. FIG. 7 is a cross-sectional view illustrating an example in which the light emitting direction of the light source module 20 is changed by the optical lens 30. FIG. 8 is a cross-sectional view showing an example in which the light emitting direction of the light source module 20 is changed by the curved LED substrate 21. That is, in the case of FIG. 7, the correcting means is the optical lens 30, and in the case of FIG. 8, the correcting means is the curved LED substrate 21a.

  Specifically, as shown in FIG. 7, when the light emission direction of the light source module 20 is directed to the dark part D <b> 1 by the optical lens 30, the emission light of the light source module 20 moves from the center to the end of the light source module 20. The emission angle (R) is increased. Thereby, since the emission angle (R) of the LED 22 at the center is small, the emitted light travels substantially straight. On the other hand, since the LED 22 at the end portion becomes larger as the emission angle (R), the outgoing light is more diffused. For this reason, the dark part D1 is correct | amended by the emitted light from the edge part of the light source module 20, and it can brighten. Therefore, uniform light distribution can be realized. In addition, the lighting device 1 does not need to use a glove that is essential for realizing a uniform light distribution in a conventional ceiling light. Therefore, it is possible to prevent the light flux that can be used as illumination light from being reduced.

  The optical lens 30 as shown in FIG. 7 may be provided for at least one light source module 20 provided in the illumination device 1, but is preferably provided for each light source module 20. Thereby, the light source module 20 and the optical lens 30 for correcting the dark part D1 are provided at 1: 1. Therefore, more uniform light distribution can be realized.

  In FIG. 7, the LED substrate 21 has a flat plate shape, but the LED substrate 21 is not limited to a flat plate shape. For example, as shown in FIG. 8, the LED substrate 21a may be a flexible substrate. When a flexible substrate is used like the LED substrate 21a, the light emission direction of the LED 22 changes if the LED substrate 21a is curved. Thereby, if the LED substrate 21a is curved so that the dark part D1 is corrected by the light from the light source module 20, the emitted light from the LED 22 at the end can be emitted toward the dark part D1. For this reason, the dark part D1 is correct | amended by the emitted light from the edge part of the light source module 20, and it can brighten. Therefore, uniform light distribution can be realized.

  The LED substrate 21a as shown in FIG. 8 may be curved so as to correct the dark part D1 by the emitted light of the LED 22 at at least one end, but the dark part D1 is corrected by the emitted light of the LEDs 22 at both ends. It is preferable to bend. Moreover, although the LED board 21a should just be provided with the at least 1 light source module 20 provided in the illuminating device 1, it is preferable that all the light source modules 20 are provided with the LED board 21a. Thereby, all the dark parts D1 which arise in the illuminating device 1 can be correct | amended with the emitted light of LED22 of an edge part. Therefore, more uniform light distribution can be realized.

(2) Measures for Brightening the Dark Part D2 (Near the Light Source) Next, in order to brighten the dark part D2, the lighting device 1 uses a part of the light emitted from the light source module 20 in the vicinity of the light source module 20 on the chassis 11 ( Light distribution control means for emitting light to the dark part D2) is provided. This light distribution control means is not particularly limited as long as it has a function of directing the light emission direction of the light source module 20 toward the dark part D2. For example, by providing this light distribution control means on the light path of the light source module 20, the dark part D2 can be brightened. More specifically, the light distribution control means may be provided integrally with any member existing on the optical path of the light source module 20, or may be provided as an independent member. Below, the case where a light distribution control means is provided in the light guide 40, and the case where it provides in the optical lens 30 are demonstrated as two typical examples.

  As shown in FIG. 4, the concavo-convex portion 41 (rough surface subjected to blasting) is formed only in the portion of the side surface 40 b (outer surface) of the light guide 40 that is close to the ceiling side (installation surface side). When light emitted from the light source module 20 is incident on a flat region on the side surface 40b of the light guide 40 where the uneven portion 41 is not formed, the light is transmitted almost without being refracted (substantially straight).

  On the other hand, when the emitted light from the light source module 20 enters the region where the uneven portion 41 of the side surface 40b of the light guide 40 is formed, the light is refracted (scattered) by the uneven portion 41. Thereby, the light refracted by the uneven portion 41 is emitted toward the dark portion D2 in the vicinity of the light source module 20 (in the vicinity of the light guide 40). For this reason, the dark part D2 becomes bright by the light refracted by the uneven part 41. Therefore, uniform light distribution can be realized. In addition, the lighting device 1 does not need to use a glove that is essential for realizing a uniform light distribution in a conventional ceiling light. Therefore, it is possible to prevent the luminous flux that can be used as illumination light from being reduced by the luminous flux being absorbed by the globe.

  On the other hand, the uneven portion 41 formed in the light guide 40 can also be formed in the optical lens 30. Specifically, the concavo-convex part 41 is formed in an appropriate part of the optical lens 30 so that a part of the light emitted from the light source module 20 emitted from the optical lens 30 is emitted toward the dark part D2. Thereby, similarly to the case where the uneven portion 41 is formed on the light guide 40, the light refracted by the uneven portion 41 is emitted toward the dark portion D2 near the light source module 20 (near the light guide 40). . For this reason, the dark part D2 becomes bright by the light refracted by the uneven part 41. Therefore, uniform light distribution can be realized. Furthermore, the light guide 40 becomes unnecessary depending on the use of the lighting device 1.

  Thus, if the light distribution control means is formed integrally with the light guide 40 or the optical lens 30, the number of parts of the lighting device 1 can be reduced. However, the light guide 40 or the optical lens 30 and the uneven portion 41 may be separate.

  The uneven portion 41 can be formed in the same manner as the light scattering pattern formed on the emission surface 40a of the light guide 40 described above. That is, the concavo-convex portion 41 is formed by a method of forming a part of the side surface 40b of the light guide 40 to be uneven by heating a mold or the like having a concavo-convex surface to the surface of the light guide 40, or by white There are various methods such as a method of printing a plurality of dots on a part of the side surface 40b of the light guide 40 using a paint such as the above. The size or pitch of the unevenness or dots can be arbitrarily set so that a part of the light emitted from the light source module 20 is emitted toward the dark part D2, similarly to the light scattering pattern.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and the embodiments can be obtained by appropriately combining the technical means disclosed in the embodiments. The form is also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Illuminating device 10 Illuminating device main body 11 Chassis (reflection part)
12 Frame 20 Light source module (light source)
30 Optical lens (light distribution control means, optical element)
40 Light guide 40a Emission surface 40b Side surface (surface facing light source)
41 Concavity and convexity (light distribution control means)
50 Reflective sheet (reflective member)
D2 Dark part (near the light source)

Claims (6)

At least one light source;
An illumination device body including the light source and a reflection unit that reflects light emitted from the light source;
An illumination device, comprising: a light distribution control unit that emits a part of light emitted from the light source to the vicinity of the light source of the reflection unit.   The illumination device according to claim 1, further comprising a light guide that houses the light source and emits light from an emission surface while guiding light emitted from the light source incident on the light source.   The lighting device according to claim 2, wherein the light distribution control unit is provided on a surface of the light guide that faces the light source. A light scattering pattern that scatters and emits light propagating through the light guide is provided on the exit surface of the light guide or the opposite surface thereof,
The lighting device according to claim 2, wherein the light scattering pattern has a pattern density that increases with distance from the light source.   5. A reflection member for reflecting leakage light from the opposite surface and re-entering the light guide on the surface opposite to the light exit surface of the light guide is provided. The illumination device according to any one of the above. An optical element disposed opposite to the light source,
The lighting device according to claim 1, wherein the light distribution control unit is provided in the optical element.

Images