JP6181376B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device.

  Various types of lighting devices have been used in the past, but with the recent increase in environmental awareness, there is an increasing demand for lighting devices that use light-emitting diodes (hereinafter also referred to as “LEDs”) with low power consumption as light sources. ing. However, when an LED is used as the light source, the light emitted from the LED is more straight ahead than the light emitted from an incandescent bulb or a fluorescent lamp. Therefore, in an illumination device that needs to illuminate light at a wide angle, The range irradiated with is insufficient. Therefore, in order to obtain a wide-angle light distribution characteristic capable of irradiating light over a wide range, the light irradiated from the LED is diffused by a light guide plate having a plurality of diffusion dots provided on the entire surface, thereby illuminating a wide range. An illumination device is known (for example, Patent Document 1).

JP 2011-249299 A

  However, in such an illumination device, in order to diffuse light in the lateral direction, it is necessary to provide diffusion dots on the entire surface of the light guide plate, and there is a problem that labor is required for processing the light guide plate. In addition, in order to maintain a sufficient light distribution characteristic in the lateral direction, it is necessary to provide diffusion dots on the entire surface of the light guide plate, so the design of the light guide plate is limited. is there.

  The present invention has been made in view of such problems, and has a high light distribution characteristic in the lateral direction even when an LED is used as a light source, and reduces the labor in processing the light guide plate. On the other hand, the main object is to provide a lighting device having high design properties.

  The present invention adopts the following means in order to achieve the main object described above.

The lighting device of the present invention is
From a light guide unit formed by combining two light guide plates that emit light incident from the incident side mainly from one side or both sides of the main surface, and a light emitting diode provided adjacent to the incident side of the main surface A lighting device comprising:
The light guide plate is orthogonal to the main surface and the incident side surface, and the right side and the left side of the light guide plate are bisected so as to have the same volume. A right region that is a region of the left side and a left region that is a region on the left side of the bisector,
At least one surface side of the main surface is provided with a plurality of diffusion regions made of processing marks processed into a rectangular shape ,
The ratio of the area of the diffusion region provided on the main surface in the right region to the main surface and the ratio of the area of the diffusion region provided on the main surface in the left region to the main surface Are almost identical,
The diffusion region provided in the main surface in the right region and the main surface in the left region in a state having an illuminance equivalent to that in the 0 ° direction at a distance of 80 cm at an angle of 20 ° in the horizontal direction. The diffusion region provided in the substrate is located at asymmetric positions .

In this illuminating device, a plurality of diffusion regions made of processing marks obtained by processing the surface of the main surface into a rectangular shape have the same illuminance as the 0 ° direction at a distance of 80 cm at an angle of 20 ° in the horizontal direction. The diffusion region provided on the main surface in the right region and the diffusion region provided on the main surface in the left region are located in asymmetrical positions, and the light guide plate Since the ratio in the right area and the ratio in the left area are substantially the same, the light emitted from the light source is angled by 20 ° in the horizontal direction in both the left and right directions depending on the diffusion area. At a distance of 80 cm, the light is diffused so as to have the same illuminance as the 0 ° direction . In this way, even when a light emitting diode having high light straightness is used as the light source, light can be widely irradiated not only in the light emitting direction of the light emitting diode but also in the lateral direction. In addition, regardless of the shape and arrangement position of the diffusion region, if the ratio of the diffusion region in each of the right region and the left region is the same, a plurality of processing traces made of at least two types of different shapes are processed. The same amount of light can be diffused in the diffusion region. By doing so, the degree of freedom in processing the diffusion region can be increased, and various forms of diffusion regions can be formed in accordance with the application to give a desired aesthetic appearance. At this time, when light diffused in the left-right direction hits the wall surface, a pattern is generated symmetrically about the lighting device, so that in addition to the light emitted from the lighting device and the lighting device, the light hits the wall surface. Can produce excellent aesthetics. The main surface of the light guide plate is orthogonal to the main surface and the incident side surface, and the right region and the left side are divided by a bisector that is a virtual surface that bisects the right side and the left side of the light guide plate so that the volume is the same. It is assumed that the light guide plate is divided into two equal parts on the right and left sides, and the right side is called the right side area, and the left side is called the left side area. In addition, here, “right side” and “left side” mean one side of the light guide plate that is divided into two regions by the bisector when the main surface is viewed from one side of the main surface of the light guide plate. And the other side, and is not limited to any particular direction. Even when the surface is viewed with reference to either the front surface side or the back surface side of the main surface, the region located on the right side of the bisector is referred to as the right region.

The lighting device of the present invention is
From a light guide unit formed by combining two light guide plates that emit light incident from the incident side mainly from one side or both sides of the main surface, and a light emitting diode provided adjacent to the incident side of the main surface A lighting device comprising:
The light guide plate is orthogonal to the main surface and the incident side surface, and the bisecting surface is based on a bisection plane that bisects the right side and the left side of the light guide plate so that the volume is the same. A right side region that is a right side region and a left side region that is a left side region from the bisector,
At least one surface of the main surface is made of a processing mark processed into a specific shape, and a plurality of diffusion regions for diffusing light emitted from the light source mainly to the main surface side is based on the bisecting surface. It is characterized by being provided at each symmetrical position.

  In this illuminating device, a plurality of diffusion regions made of processing traces processed in a specific shape are provided at a symmetrical position in each of a right region and a left region that are symmetric with respect to a bisector of the main surface. Therefore, the light emitted from the light source is diffused in a plurality of diffusion regions provided on the light guide plate, and is diffused at the same rate in both the left and right directions. In this way, even when a light emitting diode having high light straightness is used as the light source, light can be widely irradiated not only in the light emitting direction of the light emitting diode but also in the lateral direction. In addition, if the position where the diffusion region is arranged is a position that is symmetrical with respect to the main surface, the same effect can be obtained regardless of the shape and arrangement position of the diffusion region. The degree of freedom in processing the diffusion region in such a manner that light can be diffused evenly is great, and various forms of diffusion regions can be formed according to the application to give a desired aesthetic appearance.

  In the illuminating device of the present invention, the diffusion region provided in the right region and the diffusion region provided in the left region may be provided on the same surface side of the main surface. In this way, light incident from the incident side surface is mainly guided to the same surface side of the main surface, so that any one surface side of the main surface can be illuminated more brightly.

  In the illuminating device of the present invention, the number of the diffusion regions provided in the right region or the left region is provided on a proximal half surface that is a half surface of the right region or the left region closer to the light source. The number of the right side region or the left side region may be larger than the number provided on the distal half surface, which is the half surface far from the light source. Thus, by increasing the number of diffusion regions arranged on the proximal half near the light source as compared with the distal half, light can be diffused at a position near the light source. By doing so, stronger light can be diffused laterally as compared to the case where the number of diffusion regions on the distal half surface is large. Further, if the position of the diffusion region occupying each of the right region and the left region is a symmetrical position, the same effect can be obtained regardless of the shape and arrangement position of the diffusion region, so that the diffusion region is processed. The degree of freedom at the time is great, and various forms of diffusion regions can be formed according to the application to give a desired aesthetic appearance. Here, the proximal half surface and the distal half surface are the regions corresponding to the near side and the far side when the surface of the main surface is divided to be the same distance on the side closer to the light source and the far side. It means each area.

  In the illuminating device of the present invention, the proportion of the area occupied by the diffusion region provided in the right region or the left region is a proximal half surface that is a half surface of the right region or the left region closer to the light source. The proportion of the area occupied by the diffusion region provided is greater than the proportion of the area occupied by the diffusion region provided on the distal half surface which is the half surface far from the light source of the right region or the left region. Good. Thus, by increasing the area of the diffusion region disposed on the proximal half near the light source as compared with the distal half, light can be diffused at a position near the light source. By carrying out like this, stronger light can be spread | diffused laterally compared with the case where the ratio of the area of the diffusion region in a distal half surface is large.

  In the illumination device of the present invention, each of the plurality of diffusion regions may have the same shape or a similar shape. In this way, an orderly impression is given by the plurality of diffusion regions provided on the surface of the light guide plate, and the light diffused by the diffusion region diffuses in the same or similar shape in addition to the excellent design of the lighting device. It will give you an excellent aesthetic.

  In the illuminating device of the present invention, the plurality of diffusion regions may have a shape in which at least one of left and right or upper and lower sides is symmetrical. In this way, a diffusing region having symmetry is provided on the main surface, giving an orderly impression as a whole, and the light diffused by the diffusing region also affects the right and left as well as having excellent design characteristics of the lighting device. Or, since at least one of the upper and lower sides is diffused into a symmetrical shape, an excellent aesthetic appearance can be given.

  In the illuminating device of the present invention, the proportion of the area of the plurality of diffusion regions may be 50% or less with respect to the area of the main surface of the light guide plate. In this way, a sufficient amount of light can be diffused not only in the light emission direction of the light source but also in the main surface direction of the light guide plate, and thus a wide range can be illuminated.

  In the lighting device of the present invention, the plurality of diffusion regions may be provided on both sides of the main surface. By doing this, since light can be diffused on both sides of the main surface, compared to the case where the diffusion region is provided only on one side of the main surface, the unevenness of light is reduced in the lateral direction, The amount of irradiated light can be made close to uniform.

  In the illuminating device of the present invention, the position where the plurality of diffusion regions are provided may be different between one surface side of the main surface and the other surface side of the main surface. By so doing, the degree of freedom for arranging the diffusion region is increased as compared with the case where the position of the diffusion region is the same on the one side and the other side.

  In the illumination device of the present invention, when viewed from one surface side of the main surface, the plurality of diffusion regions provided on the one surface side of the main surface and the plurality of diffusion regions provided on the other surface side of the main surface. The diffusion region may be provided at a position where and do not overlap each other. If it carries out like this, the possibility that the diffusion area | region provided in the one surface side and the diffusion area | region provided in the other surface side may be recognized beforehand can be prevented, and it has the outstanding design property.

  In the illuminating device of the present invention, the diffusion region may have a linear shape, a cross shape, a circular shape, a polygonal shape, or a contour of a specific character. Thus, by making the shape of a diffusion region into a specific shape, the surface of the light guide plate is provided in a desired shape, and the design of the light guide plate can be enhanced. Moreover, since the light diffused from the diffusion region also has a desired shape in accordance with the shape of the diffusion region, the desired shape can be drawn by the diffused light, and an excellent aesthetic appearance can be given.

  In the lighting device of the present invention, the surface shape of the diffusion region may be a substantially square shape, and a region that is half the area of the main surface may be occupied by the plurality of diffusion regions. By doing this, a regular impression is given, and in particular, an impression similar to the checkerboard pattern can be given to the Japanese.

  In the illuminating device of the present invention, the two light guide plates each have an engagement groove, and the main surfaces are combined at an angle that is substantially perpendicular to the engagement groove. It may be. By doing so, the direction of the main surface of the light guide plate is arranged at a substantially right angle to the horizontal direction of the lighting device, so that the angle formed by the main surfaces of the light guide plate is different from that in the horizontal direction. Light can be irradiated with little unevenness.

  In the illuminating device of the present invention, the end surface of the light guide plate on the side farthest from the light source may have a cut portion formed of an inclined surface inclined in the light source direction. In this way, a part of the light irradiated from the light source that is diffused in the diffusion region and that has passed through the light guide plate is reflected by the inclined surface provided in the cut portion, and proceeds again in the light source direction. Become.

FIG. 3 is a front view illustrating an outline of the appearance of the illumination device 20. FIG. 4 is a cross-sectional view illustrating a schematic configuration of the illumination device 20. FIG. 6 is a six-sided view schematically showing the configuration of the illumination device 20. It is the enlarged view to which the B section in FIG. 3 was expanded. FIGS. 5A and 5B are a front view and a rear view for explaining a light guide plate 40 of another embodiment in which the arrangement position of the diffusion region 42 is different. FIG. 5A shows a front side and a back side of the light guide plate 40a, and FIG. It is the figure which each showed the surface side and the back surface side of the optical plate 40b. FIG. 6A is a front view and a rear view for explaining a light guide plate 40 according to another embodiment in which the arrangement position of the diffusion region 42 is different. FIG. 6A shows a front side and a back side of the light guide plate 40a, and FIG. It is the figure which each showed the surface side and the back surface side of the optical plate 40b. FIG. 7A is a front view and a rear view for explaining a light guide plate 40 according to another embodiment in which the arrangement position of the diffusion region 42 is different. FIG. 7A shows a front side and a back side of the light guide plate 40a, and FIG. It is the figure which each showed the surface side and the back surface side of the optical plate 40b. FIGS. 8A and 8B are a front view and a rear view for explaining a light guide plate 40 of another embodiment in which the arrangement positions of the diffusion regions 42 are different. FIG. 8A shows the front side and the back side of the light guide plate 40a, and FIG. It is the figure which each showed the surface side and the back surface side of the optical plate 40b. FIGS. 9A and 9B are a front view and a rear view for explaining a light guide plate 40 of another embodiment in which the arrangement position of the diffusion region 42 is different. FIG. 9A shows a front side and a back side of the light guide plate 40a, and FIG. It is the figure which each showed the surface side and the back surface side of the optical plate 40b. FIG. 10A is a front view and a rear view for explaining a light guide plate 40 according to another embodiment in which the arrangement position of the diffusion region 42 is different. FIG. 10A shows a front side and a back side of the light guide plate 40a, and FIG. It is the figure which each showed the surface side and the back surface side of the optical plate 40b. FIGS. 11A and 11B are a front view and a rear view for explaining the light guide plate 40 of the second embodiment in which the shape of the diffusion region 42 is different. FIG. 11A shows the front side and the back side of the light guide plate 40a, and FIG. It is the figure which each showed the surface side and the back surface side of the optical plate 40b. FIGS. 12A and 12B are a front view and a rear view for explaining the light guide plate 40 of the third embodiment in which the shape of the diffusion region 42 is different. FIG. 12A shows the front side and the back side of the light guide plate 40a, and FIG. It is the figure which each showed the surface side and the back surface side of the optical plate 40b. FIGS. 13A and 13B are a front view and a rear view for explaining a light guide plate 40 of a fourth embodiment in which the shape of the diffusion region 42 is different. FIG. 13A shows a front side and a back side of the light guide plate 40a, and FIG. It is the figure which each showed the surface side and the back surface side of the optical plate 40b. FIG. 14A is a front view and a rear view for explaining a light guide plate 40 of a fifth embodiment having a different shape of the diffusion region 42, FIG. 14A is a front side and a back side of the light guide plate 40a, and FIG. It is the figure which each showed the surface side and the back surface side of the optical plate 40b. FIG. 15A is a front view and a rear view for explaining a light guide plate 40 of a sixth embodiment in which the shape of the diffusion region 42 is different. FIG. 15A shows a front side and a back side of the light guide plate 40a, and FIG. It is the figure which each showed the surface side and the back surface side of the optical plate 40b. FIGS. 16A and 16B are a front view and a rear view for explaining a light guide plate 40 of a seventh embodiment in which the shape of the diffusion region 42 is different. FIG. 16A shows a front side and a back side of the light guide plate 40a, and FIG. It is the figure which each showed the surface side and the back surface side of the optical plate 40b. FIGS. 17A and 17B are a front view and a rear view for explaining the light guide plate 40 of the eighth embodiment in which the shape of the diffusion region 42 is different. FIG. 17A shows the front side and the back side of the light guide plate 40a, and FIG. It is the figure which each showed the surface side and the back surface side of the optical plate 40b. FIGS. 18A and 18B are a front view and a rear view for explaining a light guide plate 40 of a ninth embodiment having a different shape of the diffusion region 42, FIG. 18A is a front side and a back side of the light guide plate 40a, and FIG. It is the figure which each showed the surface side and the back surface side of the optical plate 40b. FIG. 19 is an explanatory diagram showing light distribution characteristics when a light guide plate 40 having a diffusion region 42 similar to that of the first embodiment is used. FIG. 20 is an explanatory diagram showing light distribution characteristics when a light guide plate 40 having a diffusion region 42 similar to that of the second embodiment is used. FIG. 21 is an explanatory diagram showing light distribution characteristics when a light guide plate 40 having a diffusion region 42 similar to that of the third embodiment is used. FIG. 22 is an explanatory diagram showing light distribution characteristics when a light guide plate 40 having a diffusion region 42 similar to that of the fourth embodiment is used. FIG. 23 is an explanatory diagram showing light distribution characteristics when a light guide plate 40 having a diffusion region 42 similar to that of the fifth embodiment is used. FIG. 24 is an explanatory diagram showing light distribution characteristics when a light guide plate 40 having a diffusion region 42 similar to that of the sixth embodiment is used. FIG. 25 is an explanatory diagram showing light distribution characteristics when a light guide plate 40 having a diffusion region 42 similar to that of the seventh embodiment is used. FIG. 26 is an explanatory diagram showing light distribution characteristics when the light guide plate 40 including the diffusion region 42 of another form of the seventh embodiment is used. FIG. 27 is an explanatory diagram showing light distribution characteristics when a light guide plate 40 having a diffusion region 42 similar to that of the eighth embodiment is used. FIG. 28 is an explanatory diagram showing light distribution characteristics when a light guide plate 40 having a diffusion region 42 similar to that of the ninth embodiment is used. FIG. 29 is an explanatory diagram showing light distribution characteristics when a light guide plate 40 including a diffusion region 42 of another form of the ninth embodiment is used.

  Next, the structure of the illuminating device 20 which is 1st Embodiment of this invention is demonstrated in detail using FIG.1 and FIG.2. Here, FIG. 1 is a front view showing an outline of the configuration of the illumination device 20, and FIG. 2 is a cross-sectional view taken along the line AA of FIG. Further, in order to deepen the understanding of the configuration of the lighting device 20, FIG. As shown in FIG. 1, the lighting device 20 includes a base 32 screwed into a lighting device mounting portion (not shown), a light source 36 (see FIG. 2) for irradiating light to an end surface of the light guide plate 40, and a light source 36. Two light guide plates 40a and 40b (hereinafter also referred to as “light guide plate 40”) having a plurality of diffusion regions 42 (see FIG. 3) in the main body portion 30 having the heat radiating portion 34 that releases the generated heat. .) Is attached. When power is supplied to the light source 36 by screwing the base 32 to a lighting device mounting portion (not shown) (for example, a mounting portion to which an E26 port defined by JIS standards can be mounted), the lighting device 20 is supplied. Light is emitted from the light source 36 to the light guide plate 40, and the light is diffused by a plurality of diffusion regions 42 provided in the light guide plate 40, so that the surroundings are illuminated.

  As shown in FIG. 1, the heat radiating part 34 is a metallic member having irregularities on the surface. The surface irregularities increase the surface area in contact with the outside air and increase the amount of heat released from the heat radiating part 34 to the outside air. Yes. Since the heat radiating portion 34 and a substrate (not shown) provided with the plurality of light sources 36 are in contact with each other, heat generated by lighting the light source 36 is radiated to the outside through the heat radiating portion 34. By so doing, heat can be discharged more efficiently than when not in contact with the heat radiating portion 34. In other words, it is possible to reduce the possibility that the light source 36 will break down or malfunction due to the heat generated by turning on the light source 36.

  The light source 36 is a front-emitting white light emitting diode (hereinafter referred to as “LED”), and is disposed in the vicinity of a position facing the end face of the light guide plate 40 as shown in FIG. For this reason, compared with the case where the distance of the light source 36 and the end surface of the light-guide plate 40 is separated, the light irradiated from the light source 36 can be guide | induced to the inside of the light-guide plate 40 more. Further, the light source 36 is electrically connected to the base 32 through a substrate, a conductive wire, etc. (not shown). For this reason, when the base 32 is screwed into a lighting device mounting portion (not shown) and power is supplied, power is also supplied to the light source 36.

  As shown in FIG. 5A, the light guide plate 40a is a plate member made of methacrylic resin having a thickness of about 4 millimeters to about 8 millimeters, and has one end at the center (the lower side end in FIG. 2). Two groove portions 44 and an engaging groove 46 are provided from the first end to the other end side (upper side in FIG. 2), and a notch made of an inclined surface 48a and an inclined surface 48b is provided at the end portion on one end side. Each part 48 is provided. For this reason, of the light incident from the other end side, a part of the light that reaches the one end side without being diffused by the diffusion region 42 is reflected by the inclined surface 48a or the inclined surface 48b. Thus, even when a light source with high straightness is used, it is possible to prevent the front surface of the light source from becoming bright.

  As shown in FIG. 5B, the light guide plate 40b is a plate member made of methacrylic resin having a thickness of about 4 millimeters to about 8 millimeters, and has one end at the center (the lower side end in FIG. 2). Three groove portions 44 are respectively provided from one end to the other end (upper side in FIG. 2), and notches 48 each including an inclined surface 48a and an inclined surface 48b are provided at the end on one end side. It has been. For this reason, of the light incident from the other end side, a part of the light that reaches the one end side without being diffused by the diffusion region 42 is reflected by the inclined surface 48a or the inclined surface 48b. Thus, even when a light source with high straightness is used, it is possible to prevent the front surface of the light source from becoming bright. Further, a second engagement groove 47 is provided from the other end of the central portion toward the one end side, the engagement groove 46 provided in the light guide plate 40a, the main surface of the light guide plate 40a, and the main surface of the light guide plate 40b. Engage with the surface at an angle that is substantially perpendicular. By doing so, the light emitted from the light source 36 to the light guide plate 40 can be diffused at substantially vertical angles, so that an excellent aesthetic appearance can be produced.

  As shown in FIG. 3, a plurality of diffusion regions 42 are provided on the main surface 41 of the light guide plate 40 (the surface with dotted lines in FIGS. 1 and 2). The light guide plate 40 is divided into two regions, a right region 41a and a left region 41b, by a bisecting surface 41c (a virtual surface orthogonal to the main surface 41 and the incident side surface 43 and connecting one end side and the other end side). Divided into two. At this time, since the right region 41a and the left region 41b have the same volume, the main surface 41 is divided into two equal parts by the right region 41a and the left region 41b. Here, the “right region 41a” and the “left region 41b” are bisected into two regions by the bisector 41c when the main surface 41 is visually recognized with reference to one surface side of the main surface 41. One side (upper side in FIG. 5A) and the other side (lower side in FIG. 5A) of the light guide plate 40 are respectively shown.

  As shown in FIG. 4, the diffusion region 42 includes processing marks 42 a processed to have a rectangular shape on the surface of the main surface, and the diffusion regions 42 including the processing marks 42 a and the unprocessed regions are alternately formed. The entire main surface 41 is processed so as to be positioned. The rectangular diffusion regions 42 are regularly arranged on the surface of the main surface 41. For example, a part of a checkered pattern is formed in a shape expressed on the surface of the main surface 41. As described above, the plurality of diffusion regions 42 are regularly arranged on the entire surface of the main surface, so that light incident from the other end side passes through one of the diffusion regions 42 before reaching the one end side. Therefore, light is diffused in the main surface direction. Further, since the diffusion region 42 is provided at a position where it is symmetrical, it is expected that the light incident from the other end side is diffused to the same extent in both the right direction and the left direction. For this reason, the right side and the left side of the illuminating device 20 can be made comparable brightness. In addition, since the diffusion region 42 is provided at a position that is vertically symmetric, the light diffused from the upper side and the light diffused from the lower side are approximately the same.

  Next, another embodiment of the light guide plate 40 having different arrangement positions of the diffusion regions 42 will be described with reference to FIGS. Here, FIGS. 6 to 10 are a front view and a rear view showing the light guide plate 40a and the light guide plate 40b in other embodiments. In addition, since it is the same except the arrangement | positioning position of the diffusion area | region 42, description is abbreviate | omitted here.

  As another embodiment of the light guide plate 40, as shown in FIG. 6, two light guide plates 40a and a light guide plate having the same arrangement position on the front surface side and the back surface side and different arrangement positions of the diffusion regions 42 40b may be combined. By so doing, it is possible to give different aesthetics depending on the direction in which the illumination device 20 is viewed while having symmetry.

  Further, as shown in FIG. 7, the plurality of diffusion regions 42 may be provided at positions that do not overlap each other when viewed from one surface side on the front surface side and the back surface side. In this way, when the light emitted from the light source 36 passes through the light guide plate 40, it is guided by the light source region 42 in either the front side or the back side, and therefore in either direction. Light that passes through the light guide plate 40 without being reflected can be reduced. In other words, it is possible to simultaneously brighten the horizontal direction without brightening only the front side of the light source.

  Further, as shown in FIG. 8, a combination of FIG. 6 and FIG. 7 is provided, and a plurality of diffusion regions 42 are provided at positions that do not overlap each other on the front side and the back side, and two types of light guide plates arranged at different positions, respectively. 40 may be combined to form the light guide. If it carries out like this, it can brighten in the state which reduced the nonuniformity of light with respect to the horizontal direction, giving the beauty which changes with directions where the illuminating device 20 is visually recognized.

  Furthermore, as shown in FIG. 9, a plurality of diffusion regions 42 may be provided in positions that do not overlap each other on the front surface side and the back surface side of the light guide plate 40. Specifically, it may be provided in the right region 41a on the one surface side of the main surface 41 and the left region 41b on the other surface side, respectively. In such a case, light is diffused on the left and right surfaces of the main surface on the front surface side and the back surface side of the light guide plate 40. By doing so, different aesthetics can be given on the left and right surface sides while giving a contrasting aesthetic on the front side and the back side, so that various aesthetics can be given depending on the arrangement position of the diffusion region 42. The position of the diffusion region 42 is not limited to this position, and the diffusion region 42 may be provided in the left region 41b on the one surface side of the main surface 41 and the right region 41a on the other surface side.

  And as shown in FIG. 10, the diffusion area | region 42 may be arrange | positioned only at the one end side of the light-guide plate 40, ie, the half surface (proximal half surface) near the light source 36. FIG. In this way, since the strong light can be diffused in the lateral direction close to the light source 36, compared to the case where the diffusion region 42 is disposed only on the half surface (distal half surface) far from the light source 36, The horizontal direction can be made brighter. Moreover, when the illuminating device 20 is attached to a ceiling or the like, light diffuses from the upper side, so that a broad aesthetic appearance can be given. At this time, the diffusion region 42 is provided only on the proximal half surface of the light source 36. However, as the distance from the light source 36 increases, the number of the diffusion regions 42 is reduced or the size of the diffusion region 42 is reduced. The proportion of the diffusion region 42 occupying the surface may be reduced. In either case, the same effect can be obtained.

  The arrangement position of the diffusion region 42 is not limited to that shown in FIGS. 6 to 10, and the proportion of the diffusion region 42 in each of the left region and the right region of the light guide plate 40 is the same. The diffusion regions 42 may be similar in shape, or the diffusion regions 42 having a plurality of shapes may be disposed.

  According to the illuminating device 20 described in detail above, the diffusion region 42 is provided at a position that is symmetric with respect to the bisector 41c of the main surface 41, and the bisector 41c of the main surface is symmetric. Since the diffusion regions 42 are provided symmetrically so as to have substantially the same area on the right side and the left side as surfaces, the light emitted from the light source 36 is reflected by the plurality of diffusion regions 42 provided on the light guide plate 40. Thus, the light is diffused in the right direction and the left direction with substantially the same intensity, and both side directions can be uniformly brightened. Since the light diffused at this time is diffused symmetrically, it has excellent design.

  Further, since the diffusion region 42 provided in the right region of the main surface 41 and the diffusion region 42 provided in the left region of the main surface 41 are provided on the same surface side of the main surface 41, respectively, the incident side surface The same surface side of the main surface 41 can be brightened by the light incident from.

  In addition, since the main surface 41 is provided with a plurality of diffusion regions 42 that are quadrilaterals of the same size, the entire surface of the light guide plate 40 has a uniform aesthetic appearance, and the quadrilaterals are symmetrical left and right and up and down. Therefore, it has an orderly impression as a whole. For this reason, since the light diffused from the diffusion region 42 has a uniform aesthetic appearance and an orderly impression, it has an excellent design.

  Furthermore, since the plurality of diffusion regions 42 are respectively provided on the main surfaces 41 on both sides of the light guide plate 40, light can be diffused to both sides of the main surface 41. The unevenness of the light when irradiating is reduced, and any direction can be brightly illuminated.

  Furthermore, since the plurality of diffusion regions 42 have a quadrangular surface shape and regularly occupy half of the area of the main surface 41, it is possible to give an orderly impression. On the other hand, it can recall a checkered pattern and give it an excellent aesthetic.

  Since the light guide plate 40a and the light guide plate 40b are combined at an angle that is substantially perpendicular to the engagement groove 46 and the second engagement groove 47, the main surface 41 of the light guide plate 40a and the main surface of the light guide plate 40b. Since the light emitted from the light source 36 is diffused widely in the lateral direction, the light guide plate 40a and the light guide plate 40b are combined at an angle of less than 90 °. Thus, light can be diffused in a state with little unevenness in the lateral direction.

  Then, the light-guide plate 40 of other embodiment of the illuminating device 20 is demonstrated using FIGS. 11-18. Here, FIGS. 11 to 17 are a front view and a rear view for explaining the light guide plate 40 of another embodiment in which the shape of the diffusion region 42 is different.

  As shown in FIG. 11, the light guide plate 40 in the second embodiment may have a plurality of two types of circles with different radii centered on the same point. By so doing, the light irradiated from the light source 36 is regularly diffused by the processing marks provided concentrically, so that an excellent aesthetic appearance can be given. Here, the processing mark 42a having a shape formed by combining two types of circles having different radii around the same point is formed, but the length of the radius is not limited to two types, and 3 There may be more than one kind, or one kind. Further, the arrangement position may be changed or the size may be changed between the front surface side and the back surface side, and even if the shapes of the diffusion regions 42 provided in the two light guide plates 40 are the same, they are different. May be. By using such a light guide plate 40, it is possible to irradiate light of an image representing the spread of a plurality of circles, and when this light reaches the wall surface, a pattern having the same image is produced on the wall surface. Can give an excellent aesthetic. In addition, since it is the same as that of 1st Embodiment except the shape of the diffusion area | region 42, description is abbreviate | omitted here.

  In the light guide plate 40 according to the third embodiment, as shown in FIG. 12, the diffusion regions 42 may be arranged by providing processing marks 42a in a plurality of circular shapes having the same center point. In this way, it is possible to produce light having an image that spreads around the same center point, and because this light reaches the wall surface, it is possible to produce a pattern having the same image on the wall surface, An excellent aesthetic can be given. In addition, since it is the same as that of 1st Embodiment except the shape of the diffusion area | region 42, description is abbreviate | omitted here. Further, here, the processing mark 42a is provided in a circular shape, but it may be a triangle, a quadrangle, or a polygonal shape of pentagon or more, and the size of each diffusion region 42 or the center position of the circular processing mark 42a. About can be selected suitably. Further, the front surface side and the back surface side may be arranged at the same position, the shapes of the diffusion regions 42 provided on the surfaces of the two light guide plates may be the same, or on the right side and the left side of the main surface 41. The same number may be arranged. In either case, the same effect can be obtained. In addition, it may be arranged more on the upper half of the main surface 41 and less on the lower half of the main surface. In this way, light from the light source 36 can be diffused at the proximal half surface of the main surface 41, that is, at a position close to the light source 36. Light in the direction can be brightened.

  As shown in FIG. 13A, the light guide plate 40 according to the fourth embodiment processes a processing mark 42a while leaving a circular shape, or as shown in FIG. 13B, circular processing marks 42a having different thicknesses. May be provided in combination. In this way, the light diffused from the light guide plate 40 can be produced as a shape that conforms to the shape of the processing mark 42a, and when this light reaches the wall surface, a pattern having a similar image is produced on the wall surface. Can give an excellent aesthetic. The hatched portion in FIG. 13 is the diffusion region 42 and is the same as that of the first embodiment except for the shape of the diffusion region 42, so the description is omitted here. Here, the size of the circular diameter formed by the processing mark 42a may be the same or different, and the thickness of the circular processing mark 42a may be the same or different. Moreover, even if it has the same process trace 42a in the surface side and a back surface side, you may have a different process trace 42a. In either case, the same effect can be obtained.

  In the light guide plate 40 according to the fifth embodiment, as shown in FIG. 14, the diffusion region 42 may be arranged by providing a processing mark 42 a in a continuous hexagonal shape. In this way, the light regularly irradiated from the light source 36 is diffused by the processing marks 42a provided in the regular hexagonal honeycomb shape, and when this light reaches the wall surface, Can produce a pattern having a similar image, and can give an excellent aesthetic appearance. In addition, since it is the same as that of 1st Embodiment except the shape of the diffusion area | region 42, description is abbreviate | omitted here. Here, the processing marks 42a are provided in a hexagonal honeycomb shape, but a pentagon or a heptagon or more polygon may be arranged in the same manner, or several types of similar shapes may be used. You may arrange | position to a part of main surface 41 instead of arrange | positioning to the shape whole. Further, the arrangement position may be changed or the size may be changed between the front surface side and the back surface side, and even if the shapes of the diffusion regions 42 provided in the two light guide plates 40 are the same, they are different. May be. In either case, the same effect can be obtained.

As shown in FIG. 15, the light guide plate 40 in the sixth embodiment forms a plurality of lattice-shaped regions by processing marks 42 a orthogonal to each other, and further forms processing marks 42 a on a part of the lattice-shaped regions. The diffusion region 42 may be formed by providing it. By doing so, the light irradiated from the light source 36 is regularly diffused by the processing marks 42a formed in the lattice shape, and when the light reaches the wall surface, the wall surface has a similar image. Since a pattern can be produced, an excellent aesthetic appearance can be given. In addition, since it is the same as that of 1st Embodiment except the shape of the diffusion area | region 42, description is abbreviate | omitted here. Here, the diffusion region 42 is formed by processing into a lattice shape by the processing marks 42a orthogonal to each other, but the diffusion region 42 is not limited to being orthogonal but may intersect at an arbitrary angle. Further, the distances between the adjacent processing marks 42a may all be the same, may all be different, or may be regularly arranged according to the same interval and different intervals. In either case, the same effect can be obtained.

  As shown in FIG. 16, the light guide plate 40 in the seventh embodiment may be provided with a linear or arc-shaped processing mark 42 a in a direction intersecting the optical path of the light emitted from the light source 36. By so doing, it is possible to diffuse the light more in the lateral direction than in the case where the optical path of the light emitted from the light source 36 and the processing mark 42a are arranged substantially in parallel. In addition, since it is the same as that of 1st Embodiment except the shape of the diffusion area | region 42, description is abbreviate | omitted here. Further, here, the more processing traces 42a are provided closer to the light source 36, but the ratio of the processing traces 42a to the main surface may be larger or closer to the position of the light source. . Further, the same processing mark 42a may be formed on the front surface side and the back surface side, may be formed at different positions, or the processing marks 42a formed on the two light guide plates may be the same. , May be different. In either case, the same effect can be obtained.

  As shown in FIG. 17, the light guide plate 40 in the eighth embodiment forms a desired pattern with a plurality of processing marks 42 a on the surface of the light guide plate 40, and forms a part of the region surrounded by the processing marks 42 a. Further, the diffusion region 42 may be formed by forming the processing mark 42a. In this way, light is diffused from the processing mark 42a in a shape that matches the shape of the pattern, so that the form of light can be freely determined, and when this light reaches the wall surface, a similar image is formed on the wall surface. Since it can produce the pattern which has, the outstanding beauty | look can be given. In addition, since it is the same as that of 1st Embodiment except the shape of the diffusion area | region 42, description is abbreviate | omitted here. Moreover, the shape of a pattern may be the same on the surface side and the back surface side, and may differ. Further, the positions where the patterns are formed may be the same or different. In either case, the same effect can be obtained.

  As shown in FIG. 18, the light guide plate 40 according to the ninth embodiment may have a pattern of a specific shape (for example, a cross shape or a character string) formed on the surface of the light guide plate 40 with a processing mark 42a. . In this way, even when the light guide plate 40 is directly visually recognized, an excellent aesthetic appearance can be given, and when this light reaches the wall surface, a pattern having a similar image can be produced on the wall surface. Can give an excellent aesthetic. In addition, since it is the same as that of 1st Embodiment except the shape of the diffusion area | region 42, description is abbreviate | omitted here. Further, since the light diffused by the light guide plate 40 is also diffused as a pattern of a specific shape, the diffused light from the light guide plate 40 can also give an excellent aesthetic appearance. When this light reaches the wall surface, Since a pattern with a specific shape can be brought together, an excellent aesthetic appearance can be given to the wall surface.

  In addition, this invention is not limited to embodiment mentioned above at all, and as long as it belongs to the technical scope of this invention, it cannot be overemphasized that it can implement with a various aspect.

  For example, in the above-described embodiment, the light guide plate 40 is a methacrylic resin plate having transparency. However, the material is not limited to methacrylic resin as long as the material has transparency, and methyl methacrylate. In addition to methacrylic resins such as ethyl methacrylate and the like, various materials such as acrylic resins such as methyl acrylate and ethyl acrylate, ABS resins, polycarbonate, and polyethylene can be used. In any case, the same effect as the above-described embodiment can be obtained.

  In the embodiment described above, the plurality of diffusion regions 42 are provided on both main surfaces of the light guide plate 40. However, the diffusion regions 42 may be provided only on one main surface side. Also in this case, the same effect as the above-described embodiment can be obtained.

  In the above-described embodiment, the diffusion region 42 is formed on the main surface by the laser processing mark 42a. However, the diffusion region 42 is not limited to laser processing, and may be ultrasonic processing or cutting, or a screen. It may be processed into a convex shape by printing, silk printing, or the like, or may be formed by injection molding using a mold in which irregularities are engraved in advance. In any case, the same effect as the above-described embodiment can be obtained.

  When light is irradiated from the lighting device 20 thus obtained, the relationship between the angle of light irradiation and the illuminance (lux) will be described with reference to FIGS. FIG. 19 to FIG. 29 are schematic views showing the distances at which the same illuminance is obtained at each angle in the diffusion regions 42 of the respective shapes, showing the shape of the diffusion region 42 on the upper side and using the same light source on the lower side. In this case, the trajectory of the distance with the same illuminance is shown. Here, a method of calculating the lower locus will be described. In order to draw this locus, first, the illumination device 20 was placed at the center, and the illuminance (lux) at each angle was measured at a distance of 1 m from one end side. Next, from the measured illuminance value obtained at each angle, a distance having the same illuminance as the illuminance obtained at an angle of 0 ° was calculated, and the obtained values were plotted for each angle. The traces shown on the lower side of FIGS. 19 to 29 are obtained by connecting the plotted points to each other.

  Similarly to the light guide plate 40 in the first embodiment, when the diffusion region 42 having a square lattice pattern is provided, even if it is inclined 20 ° in the horizontal direction as shown in FIG. Since it has the same illuminance at a distance of 80 cm or more, it has sufficient illuminance not only on the front side of the light source 36 (downward direction in FIG. 19) but also in the peripheral direction of the lighting device 20 (lateral direction in FIG. 19). Can keep. In addition, the range in which the same illuminance as the front side is obtained at a position 50 cm away exceeds 30 ° in both directions, and a trajectory having a bulge in the horizontal direction is drawn, so that not only the front side of the light source 36, It can be said that sufficient illuminance can be maintained in the peripheral direction of the lighting device 20 by the diffusion of the light guide plate 40.

  Similarly to the light guide plate 40 in the second embodiment, when the diffusion region 42 is formed by arranging a plurality of two types of circles having different radii around the same point, as shown in FIG. In addition, even when tilted by 20 ° in the horizontal direction, since the same illuminance is obtained at a distance of 80 cm or more, not only the front side of the light source 36 (downward direction in FIG. 20) but also the surroundings of the lighting device 20 Sufficient illuminance can also be maintained in the direction (lateral direction in FIG. 20). In addition, the range in which the same illuminance as the front side is obtained at a position 50 cm away exceeds 30 ° in both directions, and a trajectory having a bulge in the horizontal direction is drawn, so that not only the front side of the light source 36, It can be said that sufficient illuminance can be maintained in the peripheral direction of the lighting device 20 by the diffusion of the light guide plate 40.

  Furthermore, similarly to the light guide plate 40 in the third embodiment, when the diffusion region 42 is arranged by providing the processing marks 42a in a plurality of circular shapes having the same center point, as shown in FIG. Even when tilted by 20 ° in the horizontal direction, they have the same illuminance at a distance of 80 cm. From this result, it can be said that sufficient illuminance could be maintained not only in the front side of the light source 36 but also in the peripheral direction of the lighting device 20 by diffusion of the light guide plate 40. In addition, the range in which the illuminance equivalent to the front side is obtained at a position 50 cm away exceeds 30 ° in both directions, and a trajectory having a bulge in the horizontal direction is drawn, so that not only the front side of the light source 36, It can be said that sufficient illuminance can be maintained in the peripheral direction of the lighting device 20 by the diffusion of the light guide plate 40.

  Furthermore, as with the light guide plate 40 in the fourth embodiment, when a plurality of circular processing marks 42a having different thicknesses are provided in combination, or when the processing marks 42a are processed while leaving a circular shape. As shown in FIG. 22, the illuminance decreases to the same level at a distance of less than 70 cm by tilting by 10 ° in the horizontal direction, but the brightness in the light source direction maintains a sufficient illuminance of 170.7 lux. . From this result, it can be said that the front side of the light source 36 can be selectively brightened. In addition, the range where illuminance equivalent to the front side can be obtained at a position 50 cm away is a range limited to less than 30 °, and a long, sharp locus is drawn on the front side of the light source 36, so it is selected in the front direction. It can be said that light can be irradiated.

  Then, similarly to the light guide plate 40 in the fifth embodiment, when the diffusion region 42 is arranged by providing the processing marks 42a in a continuous hexagonal shape, as shown in FIG. By tilting, the illuminance decreases to the same level at a distance of about 70 cm, but even when tilted further to 30 ° in the horizontal direction, the same level of illuminance is maintained at a distance of 50 cm or more. From this result, it can be said that it was relatively bright in the range of 10 ° to 30 °. In addition, the range in which the illuminance equivalent to the front side is obtained at a position 50 cm away exceeds 30 ° in both directions, and a trajectory having a bulge in the horizontal direction is drawn, so that not only the front side of the light source 36, It can be said that sufficient illuminance can be maintained in the peripheral direction of the lighting device 20 by the diffusion of the light guide plate 40.

Further, similarly to the light guide plate 40 in the sixth embodiment, a plurality of lattice-shaped regions are formed by the processing marks 42a orthogonal to each other, and the processing marks 42a are further provided in a part of the lattice-shaped regions. When the diffusion region 42 is formed by the above, as shown in FIG. 24, the illuminance decreases to the same level at a distance of less than 70 cm by tilting by 10 ° in the horizontal direction, but the brightness in the light source direction is 146.3. Lux and sufficient illuminance are maintained. From this result, it can be said that the front side of the light source 36 can be selectively brightened. In addition, the range where illuminance equivalent to the front side can be obtained at a position 50 cm away is a range limited to less than 30 °, and a long, sharp locus is drawn on the front side of the light source 36, so it is selected in the front direction. It can be said that light can be irradiated.

  Furthermore, in the same manner as the light guide plate 40 in the seventh embodiment, when a linear or arcuate processing mark 42a is provided in the direction intersecting the optical path of the light emitted from the light source 36, FIG. As shown in the figure, even when tilted by 20 ° in the horizontal direction, it has the same illuminance at a distance of 80 cm or more, and even when tilted by 30 ° in the horizontal direction, it is the same at a distance of 70 cm. Has an illuminance of. From this result, it can be said that sufficient illuminance could be maintained not only in the front side of the light source 36 but also in the peripheral direction of the lighting device 20 by diffusion of the light guide plate 40. In addition, the range in which the same illuminance as the front side can be obtained at a position 50 cm away exceeds 40 ° in both directions, and a trajectory having a bulge in the horizontal direction is drawn, so that not only the front side of the light source 36, It can be said that sufficient illuminance can be maintained in the peripheral direction of the lighting device 20 by the diffusion of the light guide plate 40.

  In addition, as another example of the light guide plate 40 in the seventh embodiment, when a linear processing mark 42a is provided in a direction obliquely intersecting with the optical path of the light emitted from the light source 36, FIG. As shown in Fig. 5, the illuminance is reduced to the same level at a distance of less than 60 cm by turning 10 degrees in the horizontal direction, but the brightness in the light source direction is maintained at a sufficient illuminance of 174.7 lux. From this result, it can be said that the front side of the light source 36 can be selectively brightened. Further, the range in which the same illuminance as the front side 50 cm away can be obtained is a range limited to less than 30 °, and a long, sharp locus is drawn on the front side of the light source 36. It can be said that light can be irradiated.

  In addition, similarly to the light guide plate 40 in the eighth embodiment, a desired pattern is formed on the surface of the light guide plate 40 by a plurality of processing marks 42a, and further processing is performed on a part of the region surrounded by the processing marks 42a. When the diffusion region 42 is arranged by forming the mark 42a, as shown in FIG. 27, the illuminance is reduced to the same level at a distance of less than 70 cm by being inclined by 10 ° in the horizontal direction. The brightness of is maintained at 153.9 lux and sufficient illuminance. From this result, it can be said that the front side of the light source 36 can be selectively brightened. In addition, the range where illuminance equivalent to the front side can be obtained at a position 50 cm away is a range limited to less than 30 °, and a long, sharp locus is drawn on the front side of the light source 36, so it is selected in the front direction. It can be said that light can be irradiated.

  In addition, when the processing marks 42a are provided in a cross-shaped pattern as in the light guide plate 40 in the ninth embodiment, as shown in FIG. However, the brightness in the direction of the light source is 164.1 lux, maintaining a sufficient illuminance. From this result, it can be said that the front side of the light source 36 can be selectively brightened. Further, the range in which the illuminance equivalent to that on the front side can be obtained at a position 50 cm away is a relatively limited range of less than 40 °, and a long sharp locus is drawn on the front side of the light source 36. It can be said that light can be irradiated relatively selectively.

  In addition, as another example of the light guide plate 40 in the ninth embodiment, when a predetermined character-shaped processing mark 42a is provided in a direction that intersects obliquely with respect to the path of light emitted from the light source 36. As shown in FIG. 29, the illuminance is reduced to the same level at a distance of less than 70 cm by tilting 10 ° in the horizontal direction, but the brightness in the light source direction is maintained at a sufficient illuminance of 172.0 lux. Yes. From this result, it can be said that the front side of the light source 36 can be selectively brightened. Further, the range in which the same illuminance as that on the front side 50 cm away is obtained is a range limited to less than 30 °, and a long, sharp locus is drawn on the front side of the light source 36. It can be said that can be irradiated.

  As described above with reference to FIGS. 19 to 29, the light distribution characteristics vary greatly depending on the arrangement position and shape of the diffusion region 42 provided on the surface of the light guide plate 40. For example, when it is desired to illuminate widely in the peripheral direction of the illumination device 20, the diffusion region 42 may be formed so that a trajectory having a bulge in the lateral direction is drawn as shown in FIGS. 21, 24, 26, 27 and 29, the diffusion region 42 is formed so that a long, sharp locus is drawn on the front side, as shown in FIGS. It ’s good. As described above, by appropriately determining the arrangement position or shape of the diffusion region 42 according to the range in which the illumination device 20 wishes to irradiate light, the desired range can be irradiated with light. In other words, it is possible to give the lighting device 20 a desired light distribution characteristic by changing the shape and the arrangement position of the diffusion region 42 provided on the surface.

  As shown in the above-described embodiment, the present invention can be used as an illumination device that is excellent in the field of illumination, in particular, aesthetic appearance.

DESCRIPTION OF SYMBOLS 20 ... Illuminating device, 30 ... Main part, 32 ... Base, 34 ... Radiating part, 36 ... Light source,
40 ... light guide plate, 40a ... light guide plate, 40b ... light guide plate, 41 ... main surface, 41a ... right side region,
41b ... left side region, 41c ... bisection surface, 42 ... diffusion region, 42a ... processing mark, 44 ... groove portion,
46 ... engaging groove, 47 ... second engaging groove, 48 ... notch, 48a ... inclined surface, 48b ... inclined surface

Claims (14)

From a light guide unit formed by combining two light guide plates that emit light incident from the incident side mainly from one side or both sides of the main surface, and a light emitting diode provided adjacent to the incident side of the main surface A lighting device comprising:
The light guide plate is orthogonal to the main surface and the incident side surface, and the right side and the left side of the light guide plate are bisected so as to have the same volume. A right region that is a region of the left side and a left region that is a region on the left side of the bisector,
At least one surface side of the main surface is provided with a plurality of diffusion regions made of processing marks processed into a rectangular shape ,
The ratio of the area of the diffusion region provided on the main surface in the right region to the main surface and the ratio of the area of the diffusion region provided on the main surface in the left region to the main surface Are almost identical,
The diffusion region provided in the main surface in the right region and the main surface in the left region in a state having an illuminance equivalent to that in the 0 ° direction at a distance of 80 cm at an angle of 20 ° in the horizontal direction. And the diffusion region provided in is located at asymmetric positions relative to each other,
Lighting device. The diffusion region provided in the right region and the diffusion region provided in the left region are respectively provided on the same surface side of the main surface,
The lighting device according to claim 1. The number of the diffusion regions provided in the right region or the left region is the same as the number of the diffusion regions provided on the right side region or the proximal half surface of the left region closer to the light source. Or more than the number provided on the distal half that is the half of the left region far from the light source,
The lighting device according to claim 1 or 2. The ratio of the area occupied by the diffusion region provided in the right region or the left region is the diffusion region provided in a proximal half surface that is a half surface of the right region or the left region closer to the light source. The ratio of the area occupied by is larger than the ratio of the area occupied by the diffusion region provided on the distal half surface which is a half surface far from the light source of the right side region or the left side region,
The illuminating device of any one of Claims 1-3. Each of the plurality of diffusion regions has the same shape or a similar shape,
The illuminating device of any one of Claims 1-4. The shape of the diffusion region is a shape in which at least one of left and right or upper and lower is symmetric,
The illuminating device of any one of Claims 1-5. The proportion of the area of the plurality of diffusion regions is 50% or less with respect to the area of the main surface of the light guide plate,
The illuminating device of any one of Claims 1-6. The plurality of diffusion regions are respectively provided on both sides of the main surface,
The illuminating device of any one of Claims 1-7. In the illuminating device of any one of Claims 1-8,
The position where a plurality of the diffusion regions are provided is different between one surface side of the main surface and the other surface side of the main surface,
Lighting device. In the illuminating device of any one of Claims 1-9,
When viewed from one side of the main surface, the plurality of diffusion regions provided on the one surface side of the main surface and the plurality of diffusion regions provided on the other surface side of the main surface do not overlap each other. Features
Lighting device. The diffusion region has a linear shape, a cross shape, a circular shape, a polygonal shape, or a contour of a specific character,
The illuminating device of any one of Claims 1-10. The diffusion region has a substantially quadrangular surface shape and is arranged in a lattice pattern on at least one of the main surfaces.
The illuminating device of any one of Claims 1-11. The two light guide plates have engagement grooves,
The engagement grooves are combined with each other at a substantially right angle between the main surfaces,
The illuminating device of any one of Claims 1-12. The end surface of the light guide plate on the side far from the light source has a cut portion formed of an inclined surface.
The lighting device according to claim 13.

Images