JP2014150049A - Lighting module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting module such that a peripheral edge of a light emission surface does not become dark as if the peripheral edge were bordered.SOLUTION: A lighting module 1 includes: a light guide plate 20 which has an end surface 21 and a first main surface 23; a plurality of LED light sources 30 which receive incident light from the end surface 21; a light incidence surface 55 which is arranged on the side of the first main surface 23 of the light guide plate 20 and on which the light emitted from the first main surface 23 is made incident; and a diffusion plate 50 which has a light emission surface 56 where the light made incident from the light incidence surface 55 is emitted. The diffusion plate 50 has a projection strip part 51 which projects toward the light guide plate 20, is provided opposite a peripheral edge part 26 of the first main surface 23 of the light guide plate 20 on the side of the end surface 21 where the LED light sources 30 are arrayed, and has a light incident surface 52 receiving light emitted from the peripheral edge 26.

Description

  The present invention relates to a lighting module.

  Conventionally, in a surface emitting device using an LED (Light Emitting Diode) light source, light leaks from a gap between the LED light source and the light guide plate, or light transmitted through the light guide plate is emitted without being totally reflected in the light guide plate. In some cases, it looks like a point light source and looks bad. Therefore, it is composed of a light guide having a light emitting surface which is a light emitting surface from which light from an LED light source is incident and a light emitting surface from which incident light is emitted, and a plurality of hollow cells that transmit light emitted from the light emitting surface. There is proposed a surface light-emitting device having a structure including a hollow multilayer body, and including these LED light sources and holding a light guide body and a peripheral edge of the hollow multilayer body with a frame body (for example, Patent Document 1).

JP 2007-227065 A

  In the surface light emitting device described in Patent Document 1, since the peripheral portion of the light emitting surface is covered with a frame, the light emitting surface is surrounded by a frame, and the light emitting surface close to the frame is formed. Since the peripheral edge is darker than the central area, the peripheral edge of the light emitting surface is trimmed and the appearance is poor.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide an illumination module that can prevent the peripheral edge of the light emitting surface from being darkened as if it has been trimmed. is there.

  In order to solve the above-described problems, the present invention provides a light guide plate having an end surface and a first light output surface, a light source arranged along the end surface and receiving light from the end surface, and a first light output of the light guide plate. A diffusing plate having a first light incident surface that is disposed on the surface side, on which light emitted from the first light emitting surface is incident, and a second light emitting surface from which light incident from the first light incident surface is emitted; The diffusion plate protrudes toward the light guide plate and is provided at a position facing at least a peripheral portion on the end surface side where the light sources are arranged in the peripheral portion of the first light output surface of the light guide plate. Suppose that it has the convex part which has the 2nd light incident surface in which the light to enter enters.

  In order to solve the above problems, the present invention provides a light guide plate having an end surface and a first light exit surface, a light source that is arranged along a part of the end surface, and receives light from the end surface, and the light source is disposed among the end surfaces. Disposed on a part of the end face other than the end face, a reflecting member that reflects the light emitted from the light source and incident on the light guide plate into the light guide plate, and disposed on the first light exit surface side of the light guide plate, A first light incident surface on which light emitted from the first light emission surface is incident and a diffusion plate having a second light emission surface from which light incident from the first light incident surface is emitted; Second light that protrudes toward the light guide plate and is provided at a position facing at least a peripheral portion on the end surface side where the light sources are arranged, of the peripheral portion of the first light emitting surface of the light guide plate, and light emitted from the peripheral portion enters. Suppose that it has the protruding item | line part which has an entrance plane.

  Further, in addition to the above invention, a light shielding unit is provided between the peripheral edge and the second light incident surface to limit the amount of light incident on the second light incident surface from the peripheral edge. I will do it.

  Moreover, in addition to the said invention, the light shielding part shall be provided in the attachment member which attaches a light source to the said illumination module.

  Further, in addition to the above invention, the light shielding part includes a convex part and a concave part arranged alternately along the arrangement direction of the plurality of light sources, and the light source is arranged within the formation range of the convex part. To do.

  Further, in addition to the above invention, the diffuser plate is provided with corrugated irregularities formed along the arrangement direction of the plurality of light sources on the inner side surface facing the outer peripheral end surface of the ridge portion. .

  Moreover, in addition to the said invention, the diffuser plate shall be provided with the V-shaped groove | channel which crosses a protruding item | line part in the light-incidence surface of a protruding item | line part.

  In addition to the above invention, the diffusion plate is provided with corrugated irregularities.

  Further, in addition to the above invention, the light guide plate includes a diffusing surface in a region facing the light incident surface of the ridge, and the diffusing surface is disposed between adjacent light sources of the plurality of light sources. To do.

  In addition to the above invention, the diffusing surface is composed of a fine lens-shaped uneven portion or an aggregate of V-shaped grooves.

  In addition to the above invention, the lens-shaped uneven portion or V-shaped groove on the diffusing surface is an intermediate position between the adjacent light sources and is denser toward the end surface side where the light sources are arranged. Suppose that it arrange | positions and it is arrange | positioned so that it may become rough as it distances from an intermediate position or an end surface position.

  In addition to the above invention, the outer peripheral edge of the diffusion plate is disposed in the same plane as the outer peripheral end surface of the light guide plate and the outer surface of the mounting member, or the outer peripheral end surface and the outer surface of the light guide plate. Let it be more prominent.

  In addition to the above invention, the ratio between the amount of light incident on the second light incident surface and the total amount of light incident on the diffuser is determined by the ratio of the area of the second light incident surface and the first light incident on the diffuser. It is assumed that it is within ± 60% of the ratio of the area of the surface and the total area of the second light incident surfaces.

  In addition to the above invention, the light source is an LED light source.

  In order to solve the above problems, the present invention constitutes a panel illumination device by arranging a plurality of the above-described illumination modules so that the end faces of the light guide plate on the side where the light source is not disposed are in close contact with each other. To do.

It is a top view which shows the illumination module which concerns on the 1st Embodiment of this invention. It is a fragmentary sectional view which shows the 1st light source part of the left side among the AA cut surfaces of FIG. It is a fragmentary top view which shows the flame | frame which concerns on the other Example of 1st Embodiment. It is a fragmentary top view which shows a part of diffuser plate which concerns on the 2nd Embodiment of this invention. It is a fragmentary top view which shows a part of diffuser plate which concerns on the 3rd Embodiment of this invention. It is the side view which visually recognized the diffusion plate which concerns on the 3rd Embodiment of this invention from the arrow A direction. It is a fragmentary top view which shows a part of lighting module which concerns on the 4th Embodiment of this invention. It is a fragmentary sectional view showing a part of lighting module concerning a 5th embodiment of the present invention. It is a fragmentary top view which shows a part of light-guide plate which concerns on the 5th Embodiment of this invention. It is a fragmentary top view which shows the light-guide plate which concerns on the other Example of the 5th Embodiment of this invention. It is a fragmentary top view which shows a part of 1st light source part by the side of the left side of the illumination module which concerns on the 6th Embodiment of this invention. It is a fragmentary top view which shows a part of 1st light source part 11 by the side of the left side of the illumination module which concerns on the 7th Embodiment of this invention. It is a fragmentary top view which shows a part of 1st light source part by the side of the left side of the illumination module which concerns on the 8th Embodiment of this invention. It is a fragmentary sectional view which shows the 1st light source part of the left side of the illumination module which concerns on the 9th Embodiment of this invention. It is a top view which shows an example of the panel type illuminating device which arranged two the illumination modules of this invention in parallel. 4 shows a panel-type lighting device in which four lighting modules of the present invention are arranged in parallel, the upper part (a) is a layout diagram of light sources, the interruption (b) is a brightness distribution diagram of the lighting module alone, and the lower part (c) is a lighting module. It is a distribution map of the brightness when two are arranged in parallel. It is a graph which shows angle distribution (Α, Θ) of scattered light intensity by a single true spherical particle. It is a fragmentary sectional view which shows the structure of the illumination module which concerns on the 10th Embodiment of this invention. It is a figure explaining the intensity | strength of the light which advances the inside of the illumination module shown in FIG. It is a figure explaining the area ratio of a light-incidence surface and an inner bottom face. It is a figure which shows the modification of 10th Embodiment.

  Hereinafter, an illumination module 1 according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a plan view showing an illumination module 1 according to the first embodiment of the present invention, and FIG. 2 is a partial cross-sectional view showing a first light source unit 11 on the left side of the AA cut surface of FIG. It is. In the following description of each embodiment, the arrow X1 direction is the right side (right side), the arrow X2 direction is the left side (left side), the arrow Y1 direction is the rear side (rear side), and the arrow Y2 direction. Is defined as the front (front side), the arrow Z1 direction as the upward direction (upper side), and the arrow Z2 direction as the downward direction (lower surface side). The arrow Z1 direction is sometimes referred to as the front surface side, and the arrow Z2 direction is sometimes referred to as the back surface side.

  As shown in FIG. 1, the illumination module 1 includes a first light source unit 11 on the left side and a second light source unit 12 on the right side. Although the first light source unit 11 and the second light source unit 12 are arranged so as to face each other, since both can be configured in common, in each embodiment shown in FIG. One light source unit 11 will be described as an example.

  The illumination module 1 according to the first embodiment has a rectangular outer shape when viewed from above, and is flat in the vertical direction. As shown in FIGS. 1 and 2, the illumination module 1 supports the light source plate 20, the plurality of LED light sources 30 arranged along the end surface 21 on the left side of the light guide plate 20, and the LED light source 30. A frame 40 is provided as a mounting portion that shields the light emitted from the LED light source 30 from being directly incident on the diffusion plate 50, and the diffusion plate 50 and the like disposed on the surface side of the light guide plate 20. The 1st light source part 11 is the periphery which is a part which opposes the end surface 21, the LED light source 30, the flame | frame 40, the convex strip part 51 of the diffusion plate 50, and the convex strip part 51 of the light-guide plate 20 in the illumination module 1. The part where the part 26 is arranged is said.

  In this embodiment, the LED light source 30 is used as the light source. However, the light source may be a CCFL (Cold Cathode Fluorescent Lamp), a light bulb (for example, an incandescent light bulb) or a fluorescent light. Can be used, and the type of the light source is not particularly limited. However, LED light sources are superior to other light sources in that they consume less power, generate less heat, are easier to miniaturize, and are less expensive. Therefore, also in each embodiment described below, a case where the LED light source 30 is used as a light source will be described as an example.

  In the first embodiment, in the illumination module 1, a reflection plate 60 is disposed on the back side of the light guide plate 20 (in the direction opposite to the diffusion plate 50). Further, a circuit 70 that controls the driving of the LED light source 30 is disposed on the back side of the reflector 60. The reflection plate 60 may be a reflection sheet or may be omitted.

  The light guide plate 20 includes a left-side end surface 21 and a right-side end surface 22 on which light emitted from the LED light source 30 is incident, a first main surface 23 as a first light emitting surface facing the diffusion plate 50, and And a second main surface 24 that is a surface facing the first main surface 23 (that is, on the back surface side). The end surfaces 21 and 22 are incident surfaces for light emitted from the LED light source 30, and the first main surface 23 is a light emitting surface that emits light from the light guide plate 20 to the diffusion plate 50. The second main surface 24 is in close contact with the reflecting plate 60, and the second main surface 24 functions as a light reflecting surface that travels inside the light guide plate 20. In addition, as the light guide plate 20, a light scattering light guide containing many light scattering particles described later is used. By using a light scattering light guide for the light guide plate 20, the light incident in the light guide plate 20 is scattered in the light guide plate 20, and the illuminance distribution of the light emitted from the first main surface 23 can be made uniform. it can.

  A plurality of LED light sources 30 are arranged along the left side end surface 21 of the light guide plate 20 with a substantially constant interval, and a plurality of LED light sources 30 also have a substantially constant interval on the right side end surface 22. Are arranged. The LED light source 30 is disposed in the thickness range of the light guide plate 20, but it is more preferable that the LED light source 30 is disposed at substantially the center in the thickness direction of the light guide plate 20. By disposing at the center, the amount of light emitted from the first main surface 23 is increased as compared with the case of not disposing at the center.

  1 illustrates a case where seven LED light sources 30 are provided on each of the left side and the right side of the light guide plate 20, but the number of LED light sources 30 is the planar size of the illumination module 1. Depending on the required brightness, it is appropriately selected.

  Each of the LED elements constituting the LED light source 30 in the present embodiment is a white LED element, and controls light emission from each LED element by an input signal from the control circuit 70. It is also possible to use an LED lamp of a type in which a red LED element, a green LED element, and a blue LED element are packaged as an LED element, and light emission from the LED elements of each color according to an input signal from the control circuit 70. The designated color can be emitted by mixing the colors. The LED light source 30 is mounted on the LED substrate 35 and supported by a base 41 of a frame 40 as an attachment member.

  The frame 40 is formed by bending and bending a metal plate, and includes a base 41 along the end surface 21, a light shielding portion 42 extending from the base 41 toward the first main surface 23 of the light guide plate 20, and a reflection. The light shielding part 43 extended to the board 60 side is provided. The frame 40 is attached to the illumination module 1 by sandwiching the light guide plate 20 and the reflection plate 60 between the light shielding portion 42 and the light shielding portion 43. In addition, the light shielding plate 42 and the light shielding portion 43 sandwich the light guide plate 20 and the reflection plate 60 so that the light guide plate 20 and the reflection plate 60 are in close contact with each other. In the light shielding part 42, the light emitted from the LED light source 30 does not enter the diffusion plate 50 as it is, that is, the light from the LED light source 30 is directed to the diffusion plate 50 arranged in the upward direction of the LED light source 30. It has a light shielding function that prevents direct incidence. The light shielding unit 43 has a light shielding function that prevents light from the LED light source 30 from leaking to the outside on the back surface side of the reflecting plate 60.

  The reflection plate 60 is a plate member having substantially the same shape as the light guide plate 20 in a plan view, is in close contact with the second main surface 24 of the light guide plate 20, and reflects light traveling in the light guide plate 20 at the reflection surface 61. Let Note that the position of the end face 62 on the left side of the reflector 60 illustrated in FIG. 2 matches the position of the end face 21 of the light guide plate 20, but it may be extended to the lower side of the LED light source 30. The same applies to the right side.

  The diffuser plate 50 is quadrangular in plan view. The planar shape and planar size of the illumination module 1 in the present embodiment are defined. That is, the diffusion plate 50 is disposed in the same plane as the outer peripheral end surface 27 (end surface 21, end surface 22 and front and rear end surfaces) of the light guide plate 20 and the outer surface 44 of the frame 40, or the outer peripheral end surface 27. Further, it protrudes left and right and front and rear than the outer surface 44. The diffusing plate 50 is formed with a ridge 51 that protrudes toward the first main surface 23 of the light guide plate 20. The protrusion 51 is formed in the first light source 11 on the left side and the second light source 12 on the right side. The ridge 51 is disposed at a position facing the peripheral edge 26 on the side of the light guide plate 20 where the LED light source 30 is disposed. The front end portion plane of the ridge 51 facing the light guide plate 20 is a second light incident on which light emitted from the first main surface 23 that is the first light exit surface is incident on the light guide plate 20 of the ridge 51. This is a light incident surface 52 as a surface. The peripheral edge portion 26 is a portion facing the light incident surface 52 of the ridge portion 51. In addition, in the illumination module 1 which concerns on this Embodiment, although the protruding item | line part 51 is formed in the right-and-left peripheral part which is the side by which the LED light source 30 is arrange | positioned among the peripheral parts of the diffusion plate 50, it is diffused. You may form over the perimeter (four sides) of the board 50. FIG. By forming over the entire circumference, the rigidity of the diffusion plate 50 can be increased.

  In the diffusing plate 50, a concave portion 50 </ b> A is formed between the left and right convex portions 51 in the cross-sectional shape in the AA cut plane, that is, in a plane orthogonal to the arrangement direction of the LED light sources 30. The convex inner side bottom surface 55 as the first light incident surface, which is the bottom surface of the recess 50 </ b> A (the surface facing the first main surface 23), is a light incident surface on which light emitted from the first main surface 23 is incident. The outer peripheral end surface 53 is a surface in contact with air. The inner side surface 54 also faces the recess 50A and is in contact with air. Therefore, light that enters the outer peripheral end surface 53 from the inside of the ridge 51 beyond the critical angle is totally reflected by the outer peripheral end surface 53. Further, light that enters the inner side surface 54 beyond the critical angle from the inside of the ridge 51 is totally reflected by the inner side surface 54. The outer peripheral end surface 53 and the inner side surface 54 are surfaces parallel to each other, and the light incident surface 52 is a surface orthogonal to the outer peripheral end surface 53 and the inner side surface 54. As the diffusion plate 50, a light scattering light guide containing a large number of light scattering particles is used. By using the light scattering light guide for the diffusion plate 50, the light incident on the diffusion plate 50 is scattered in the diffusion plate 50, and the illuminance distribution of the light emitted from the light exit surface 56 as the second light exit surface Uniformity can be achieved.

  The light incident surface 52 of the ridge 51 includes a shielding region B which is a region where light emitted from the LED light source 30 or the first main surface 23 (particularly the peripheral portion 26) is shielded by the light shielding portion 42, and a light shielding portion. And an incident area C that is incident without being shielded by 42. That is, the light emitted from the peripheral portion 26 by disposing the light shielding portion 42 between the light incident surface 52 of the convex portion 51 and the peripheral portion 26 on the side where the LED light source 30 of the light guide plate 20 is disposed. The amount of light incident on the light incident surface 52 can be limited. The shielding area B has at least a width (width dimension in the left-right direction) that prevents the light emitted from the LED light source 30 from directly entering the diffusion plate 50 without passing through the light guide plate 20. In this embodiment, the width of the shielding area B (width dimension in the left-right direction) and the width of the incident area C (width dimension in the left-right direction) are incident on the light incident surface 52 from the first main surface 23. When the light to be emitted exits from the light exit surface 56, the entire brightness of the light exit surface 56 is set to be uniform. The light incident on the light incident surface 52 from the first main surface 23 is mainly emitted from the peripheral portion of the light emitting surface 56. The width of the shielding area B and the width of the incident area C are set so that the brightness of the peripheral part of the light emitting surface 56 approaches the brightness inside the peripheral part.

  The diffuser plate 50 is in close contact with the light shielding part 42 of the frame 40 at the light incident surface 52 of the ridge 51. In the state where the light guide plate 20 and the reflection plate 60 are overlapped, the illumination module 1 sandwiches the end side (end face 21 and end face 62) side between the light shielding part 42 and the light shielding part 43 of the frame 40, thereby shielding the light. The light guide plate 20, the reflection plate 60, and the frame 40 can be fixed by passing a screw (not shown) through the light guide plate 20 from the portion 43 side. The contact surfaces may be fixed and integrated with an adhesive having a high light transmittance. The diffusing plate 50 can be fixed to the light shielding portion 42 of the frame 40 with an adhesive in the light shielding area B of the light incident surface 52.

  Next, in the illumination module 1 according to the first embodiment, a light path until the light emitted from the LED light source 30 is emitted from the light emitting surface 56 will be described with reference to FIGS. 1 and 2. A part of the light emitted from the LED light source 30 of the first light source unit 11 on the left side enters the light guide plate 20 from the end surface 21 of the light guide plate 20, and for example, as indicated by a broken line L1, the light guide plate 20 The light travels toward the right side while being totally reflected by the first main surface 23 and the second main surface 24, and travels while being scattered by the light scattering particles, and either is emitted from the first main surface 23 in a diffused state. The other part of the light emitted from the LED light source 30 of the first light source unit 11 proceeds while being scattered by the light scattering particles without being totally reflected by the first main surface 23 or the second main surface 24, Some light is emitted from the first main surface 23 in a diffused state.

  The light emitted from the LED light source 30 of the second light source unit 12 on the right side also enters the light guide plate 20 from the end surface 22 on the right side of the light guide plate 20 in the same manner as the left side. The light that has entered the light guide plate 20 is scattered by the first main surface 23 and the second main surface 24 of the light guide plate 20 by total reflection and light scattering particles, so that either of them is emitted from the first main surface 23. Is done.

  The light emitted from the LED light source 30 of the first light source unit 11 and the LED light source 30 of the second light source unit 12 and incident on the light guide plate 20 and emitted from the first main surface 23 in a diffused state is reflected in the light guide plate 20 in the first state. The first principal surface 23 and the second principal surface 24 are in a state where the illuminance is made uniform by being totally reflected and scattered by the light scattering particles.

  The light emitted from the first main surface 23 of the light guide plate is incident on the inner bottom surface 55 of the ridge 51 of the diffusion plate 50 and the light incident surface 52 of the ridge 51, and travels through the diffusion plate 50. The light exits from the light exit surface. The diffusion plate 50 contains light scattering particles. Therefore, the light incident on the diffuser plate 50 is scattered in the diffuser plate 50, and the illuminance distribution of the light emitted from the light exit surface 56 can be made uniform.

  The light emitted from the LED light source 30 is bright at a position close to the LED light source 30, and becomes darker as the distance increases. However, the illumination module 1 according to the first embodiment includes the first light source unit 11 on the left side and the second light source unit 12 on the right side, and light travels toward the right side and the left side. Therefore, the light from the left side and the light from the right side complement each other, so that the brightness of the first main surface 23 of the light guide plate 20 is equalized.

  As shown in FIG. 2, the light shielding portion 42 of the frame 40 is disposed on the peripheral edge portion 26 of the light guide plate 20 near the LED light source 30. The light shielding part 42 restricts the light incident on the convex part 51 from the LED light source 30 and the peripheral part 26, and a part of the light incident surface 52 is a shielding area B. That is, a part of the light emitted from the LED light source 30 and directed to the light incident surface 52 is shielded by the shielding region B, that is, the light shielding part 42. On the other hand, in the incident region C, a part of the light emitted from the first main surface 23 toward the light incident surface 52 of the ridge 51 is incident. A part of the light incident from the light incident surface 52 of the ridge 51 is totally reflected by the inner side surface 54 and the outer peripheral end surface 53 of the ridge 51 as indicated by the broken line L2, and the light scattering particles. Then, the light is emitted from the light emitting surface 56 of the diffusing plate 50 mainly above the arrangement region of the ridges 51, that is, from the peripheral portion of the light emitting surface 56 on the side where the LED light source 30 is arranged. In other words, a part of the light incident in the ridge 51 is diffused from the light exit surface 56 by being totally reflected by the inner side surface 54 and the outer peripheral end surface 53 and being scattered by the light scattering particles. It is emitted in a state. The light incident on the ridge 51 is emitted mainly from above the position where the ridge 51 is disposed.

  In the illumination module 1 according to the first embodiment described above, the shielding region B is formed by the light shielding part 42 of the frame 40. Thereby, the emitted light of the LED light source 30 is prevented from directly entering the diffusion plate 50. In addition, a part of the light incident on the light guide plate 20 is totally reflected by the first main surface 23 and the second main surface 24 of the light guide plate 20 and is scattered by the light scattering particles, while being first reflected. The light is emitted as diffused light from the surface 23 and is incident on the diffusion plate 50. The light emitted from the first main surface 23 passes through the diffusion plate 50 and is emitted from the light emission surface 56 while being further diffused by the diffusion plate 50. Furthermore, the illumination module 1 has a ridge 51 formed on the peripheral edge of the diffuser plate 50 on the side where the LED light source 30 is disposed. By providing the ridge 51, an outer peripheral end surface 53 and an inner peripheral side surface 54 that come into contact with air are formed. Therefore, a part of the light emitted from the peripheral portion 26 of the light guide plate 20 and incident on the light incident surface 52 of the ridge 51 is totally reflected by the inner side surface 54 and the outer peripheral end surface 53 of the ridge 51, and The light travels while being scattered by the light scattering particles, and diffused light is emitted from the peripheral portion of the light exit surface 56 of the diffusion plate 50.

That is, by forming the shielding region B with the light shielding part 42, the light emitted from the LED light source 30 can be incident on the light guide plate 20 without being directly incident on the diffusion plate 50. Part of the light incident on the light guide plate 20 is reflected from the first main surface 23 while being totally reflected by the first main surface 23 and the second main surface 24 of the light guide plate 20 and diffused by the light scattering particles. The light is emitted as diffused light and is incident on the diffusion plate 50. Thus, when the light emitting surface 56 that emits light is viewed, the LED light source 30
Can be prevented from appearing as a point light source.

  Further, a ridge 51 is formed at the peripheral edge of the arrangement position of the LED light source 30 of the diffusing plate 50, and light emitted from the peripheral edge 26 of the light guide plate 20 is projected from the light incident surface 52 of the ridge 51. The light is guided into the light 51 and is totally reflected by the inner side surface 54 and the outer peripheral end surface 53 of the ridge 51, and is scattered by the light scattering particles, so that the light is emitted from the peripheral portion of the light emitting surface 56 of the diffusion plate 50. Diffuse light is emitted. Thereby, even when it is set as the structure provided with the light-shielding part 42, the dark part which was light-shielded by the light-shielding part 42 and was edged in the peripheral part by the side of the light-projection surface 56 provided with the light-shielding part 42 arises. Can be prevented.

  Therefore, it is not dark as if the peripheral portion of the light emitting surface was trimmed while eliminating the appearance of the LED light source 30 being a point light source. The illumination module 1 that equalizes the overall brightness of the light emitting surface 56 including the peripheral edge portion can be provided.

  Note that the size of the light incident area C of the ridge 51 can be adjusted by increasing or decreasing the width of the ridge 51, and thereby the light emitted from the light guide plate 20. By adjusting the amount of incident light on the ridges 51, it is possible to easily equalize the brightness of the central part and the peripheral part of the light exit surface of the diffusion plate 50.

  That is, by adjusting the incident region C width (dimension in the left-right direction), the amount of light incident on the ridges 51 from the first main surface 23 can be adjusted, and thereby the peripheral portion of the light emitting surface 56 of the diffuser plate 50. The amount of light emitted from the can be adjusted. For example, by adjusting the incident region C width (dimension in the left-right direction), the difference in the amount of light emitted from the periphery of the light exit surface 56 of the diffuser plate 50 and the inner side thereof can be reduced. The overall illuminance can be leveled. The width of the incident region C (the dimension in the left-right direction) can be adjusted by adjusting the width of the light shielding unit 42.

  In the illumination module 1 according to the present embodiment, the light shielding region B is formed by the light shielding part 42 provided in the frame 40. However, the shielding region B may be formed, for example, by sticking a light-shielding tape to the light incident surface 52 or by applying a light-shielding paint. By providing the light shielding part 42 on the frame 40, it is possible to reduce the number of members, such as omitting tape and paint, and to omit the attaching or applying process.

  In the illumination module 1 according to the first embodiment, the brightness of the light exit surface 56 can be further homogenized by devising the shape of the light shielding portion 42 of the frame 40. This will be described with reference to examples. FIG. 3 is a partial plan view showing a frame 40 according to another example of the first embodiment. Since the configurations of the light guide plate 20 and the diffusion plate 50 are the same as those of the first embodiment described above, the description thereof is omitted, and common portions are denoted by the same reference numerals. As shown in FIG. 3, the light shielding portion 42 of the frame 40 includes convex portions 42 a and concave portions 42 b that are alternately arranged along the arrangement direction of the plurality of LED light sources 30. The convex part 42a covers the upper part of the LED light source 30 on the diffusion plate 50 side, and the light emitted from the LED light source 30 is not directly incident on the convex strip part 51 of the diffusion plate 50 in the formation range of the convex part 42a. Shielded. The recess 42b opens between adjacent LED light sources 30, and the light emitted from the LED light source 30 enters the ridge 51 of the diffuser plate 50 while going around the protrusion 42a.

  As described above, in this embodiment, the light shielding part 42 of the frame 40 is provided with the convex part 42a that shields the light emitted from the LED light source 30 and the concave part 42b that opens. As a result, as compared with the frame 40 in which the light shielding part 42 does not have the convex part 42a and the concave part 42b as shown in FIG. 3, the convex stripe part 51 at a position close to the LED light source 30 and a distant position between the LED light sources 30. The difference in the brightness of the light incident on can be reduced. As a result, it is possible to provide the illumination module 1 capable of further equalizing the brightness of the entire light exit surface 56.

The shape of the convex portion 42a is not a rectangle as shown in the figure, but may be a trapezoid with a thin tip, a triangle, or a circular tip portion. The concave portion 42b and the light incident on the convex portion 51 may be formed. What is necessary is just to set the vertical and horizontal dimension and shape which can make the difference in brightness small.
Further, the frame 40 of the present example provided with the convex part 42a and the concave part 42b can be used in each embodiment described below.

(Second Embodiment)
Next, an illumination module 2 according to a second embodiment of the present invention will be described with reference to FIG. In addition, although illustration is abbreviate | omitted, the illumination module 2 of 2nd Embodiment is light-guide plate 20 and several LED arranged along the end surface 21 of the light-guide plate 20 similarly to 1st Embodiment. A light source 30, a frame 40 that supports the LED light source 30 and shields light from the peripheral edge 26 on the left side of the light guide plate 20, and a diffusion plate 50 that is disposed on the light guide plate 20 are provided. The illumination module 2 of the second embodiment is mainly different from the first embodiment in the configuration of the diffusion plate 50. Thus, the difference will be mainly described while being compared with the first embodiment. Portions common to the first embodiment are given the same reference numerals, and descriptions thereof are omitted or simplified.

  FIG. 4 is a partial plan view showing a part of the diffusion plate 50 according to the second embodiment of the present invention. In FIG. 4, the diffusion plate 30 is viewed from the light incident surface 52 side of the ridge 51. On the inner side surface 54 connected to the light incident area C of the ridge 51 in the present embodiment, corrugated irregularities 57 are formed along the arrangement direction of the plurality of LED light sources 30. In FIG. 4, the corrugated irregularities 57 are exaggerated. Further, the pitch of the corrugated unevenness 57, the arrangement pitch of the LED light sources 30, and the depth (or height) of the unevenness 57 can be arbitrarily set.

  Next, the progress of light in the ridge 51 in the second embodiment will be described with reference to FIGS. Light emitted from the LED light source 30 enters the light guide plate 20 from the end surface 21 of the light guide plate 20. A part of the light incident in the light guide plate 20 enters the light incident surface 52 of the ridge 51 in the incident region C. A part of the light incident from the light incident surface 52 of the convex portion 51 proceeds while being totally reflected by the inner side surface 54 and the outer peripheral end surface 53 of the convex portion 51 and diffused by the light scattering particles, and the diffusion plate 50. The light exit surface mainly emits light from above the position where the ridges 51 are arranged.

  Since the concave and convex portions 57 are formed on the inner side surface 54 of the convex portion 51, the light is easily diffused on the concave and convex portions 57 and reflected in the convex portion 51 as indicated by the arrows in the figure. In this way, even when the frame 40 is present, the peripheral edge of the diffusion plate 50 can be brightened, and the peripheral edge of the diffusion plate 50 can be prevented from being darkened as if it has been trimmed. As a result, the brightness of the entire light exit surface of the diffuser plate 50 can be further homogenized.

(Third embodiment)
Next, an illumination module 3 according to a third embodiment of the present invention will be described with reference to FIGS. In addition, although illustration is abbreviate | omitted in the illumination module 3 of 3rd Embodiment, several LED arranged along the light guide plate 20 and the end surface 21 of the light guide plate 20 similarly to 1st Embodiment. A light source 30, a frame 40 that supports the LED light source 30 and shields light from the peripheral edge 26 of the light guide plate 20, a diffusion plate 50 that is disposed on the light guide plate 20, and the like are provided. The illumination module 3 of the third embodiment is mainly different from the first embodiment and the second embodiment in the configuration of the diffusion plate 50. Thus, the difference will be mainly described while being compared with the first embodiment. Portions common to the first embodiment are given the same reference numerals, and descriptions thereof are omitted or simplified.

  FIG. 5 is a partial plan view showing a part of the diffusion plate 50 according to the third embodiment of the present invention, and FIG. 6 is a side view of the diffusion plate 50 viewed from the arrow A direction. 5 shows a state in which the diffusion plate 50 is viewed from the light incident surface 52 side (back surface side) of the ridge 51. FIG. As shown in FIGS. 5 and 6, in the diffusion plate 50 of the present embodiment, the light incident surface 52 of the ridge 51 crosses the ridge 51 (from the outer peripheral end surface 53 to the inner side surface 54). A V-shaped groove 58 is formed. The V-shaped groove 58 has a light prism effect, and as shown in FIG. 6, the light emitted from the LED light source 30 is emitted from the incident region C of the light incident surface 52 of the ridge 51. Incident. A part of the incident light is diffused by the slope of the V-shaped groove 58 and incident into the ridge 51 as indicated by the arrow in the figure, and the outer peripheral end surface 53 and the inner side surface 54 of the ridge 51 are separated. The light travels while being totally reflected between the light scattering particles and scattered by the light scattering particles, and exits mainly from above the arrangement position of the protrusions 51 on the light exit surface 56 of the diffusion plate 50.

  Therefore, the light emitted from the light guide plate 20 is diffused by the light incident surface 52 and is incident on the ridge 51. As a result, even if the light shielding part 42 of the frame 40 is present, the peripheral edge of the light emitting surface on which the ridges 51 are arranged is brightened, and the light is not darkened as if the peripheral edge was trimmed. The brightness of the entire exit surface can be leveled.

  5 and 6, the V-shaped groove 58 is exaggerated. The V-shaped groove 58 only needs to have a light prism effect, and the relative position with respect to the LED light source 30, the depth of the groove 58, and the pitch can be arbitrarily set. Accordingly, a so-called prism sheet can be used as the V-shaped groove 58.

  In FIG. 5, the V-shaped groove 58 crosses from the outer peripheral end surface 53 to the inner side surface 54 of the ridge 51, but the same effect can be obtained even if it is formed in the range of the light incident region C. . Moreover, you may comprise so that the protruding item | line part 51 may be cut | disconnected longitudinally (front side rear side direction).

(Fourth embodiment)
Next, an illumination module 4 according to a fourth embodiment of the present invention will be described with reference to FIG. The illumination module 3 according to the fourth embodiment includes a light guide plate 20, a plurality of LED light sources 30 arranged along the end surface 21 of the light guide plate 20, and an LED light source, as in the first embodiment. 30, a frame 40 that shields light from the peripheral edge portion 26 of the light guide plate 20, and a diffusion plate 50 that is disposed on the light guide plate 20.

  The illumination module 4 of the fourth embodiment is mainly different from the first embodiment, the second embodiment, and the third embodiment in the configuration of the diffusion plate 50. Specifically, the corrugated irregularities 57 formed on the ridges 51 described in the second embodiment and the V-shaped ridges formed on the ridges 51 described in the third embodiment. The groove 58 is used in combination. Therefore, the difference will be mainly described while comparing the second embodiment and the third embodiment. Portions common to the second embodiment and the third embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  FIG. 7 is a partial plan view showing a part of the illumination module 4 according to the fourth embodiment of the present invention. As described in the second embodiment, the diffusing plate 50 includes corrugated irregularities 57 along the arrangement direction of the plurality of LED light sources 30 formed on the inner side surface 54 of the ridge 51, and a third As described in the embodiment, a V-shaped groove 58 that traverses the ridge 51 formed on the light incident surface 52 of the ridge 51 (from the outer peripheral end surface 53 to the inner side surface 54) is provided. ing.

  As described in the second embodiment, the illumination module 4 configured as described above has the unevenness 57 formed on the inner side surface 54 of the protruding portion 51, and thus the light has the unevenness 57 surface. And is incident on the ridge 51. Further, as described in the third embodiment, the light emitted from the light guide plate 20 is diffused by the V-shaped groove 58 and is incident on the ridge 51. As described above, by combining the configurations of the first to third embodiments, even if the frame 40 is present, the peripheral portion of the light emitting surface on which the ridges 51 are arranged is brightened. Further, it is possible to eliminate the darkening as if the peripheral edge portion of the diffusion plate 50 was trimmed, and to uniform the brightness of the entire light emitting surface.

(Fifth embodiment)
Next, the illumination module 5 which concerns on the 5th Embodiment of this invention is demonstrated with reference to FIG. 8, FIG. The illumination module 5 of the fifth embodiment is mainly different from the first embodiment in the configuration of the light guide plate 20. Thus, the difference will be mainly described while being compared with the first embodiment. Portions common to the first embodiment are given the same reference numerals, and descriptions thereof are omitted or simplified.

  FIG. 8 is a partial sectional view showing a part of the illumination module 5 according to the fifth embodiment of the present invention, and FIG. 9 is a partial plan view showing a part of the light guide plate 20 according to the fifth embodiment. FIG. As shown in FIG. 8, the illumination module 5 of the fifth embodiment includes a light guide plate 20 and a plurality of LED light sources arranged along the end surface 21 of the light guide plate 20, as in the first embodiment. 30, a frame 40 that supports the LED light source 30 and shields the light at the peripheral edge 26 of the light guide plate 20, a diffusion plate 50 that is disposed on the light guide plate 20, and the like.

  In the light guide plate 20, a diffusion surface 25 is formed on the first main surface 23 facing the light incident surface 52 of the ridge 51. For example, the diffusing surface 25 is formed with a fine uneven surface in a dot shape by roughening a predetermined position of the first main surface 23. As shown in FIG. 9, the diffusion surface 25 is formed between adjacent LED light sources 30. The formation range is a range between the end surface 21 on which the light from the LED light source 30 is incident and a position hitting the lower side of the inner side surface 54 of the first main surface 23, and forms a triangle with the end surface 21 side as a base. ing.

  In the light guide plate 20 in which the diffusing surface 25 is not formed, the light source plate 20 is bright in the immediate vicinity of the light emission direction of the LED light source 30 and dark in the peripheral portion shifted from the light emission direction (for example, a region between adjacent LED light sources 30). Therefore, by forming the diffusing surface 25 at the peripheral position where it becomes dark, the light is diffused in the range where the diffusing surface 25 is formed, so that it becomes brighter than the surroundings. Therefore, on the first main surface 23 that is the light emitting surface, the difference in brightness between the immediate vicinity of the LED light source 30 in the light emitting direction and the peripheral portion thereof can be reduced. As a result, due to a synergistic effect with the provision of the ridges 51, the peripheral edge of the diffuser plate 50 does not become dark as if it is edged, and the brightness of the entire light emitting surface including the peripheral edge of the diffuser plate 50 is uniform. Can be The light diffused by the diffusion surface 25 is mainly light emitted from the LED light source 30 arranged on the end surface 22. That is, a part of the light emitted from the LED light source 30 arranged on the end surface 22 and traveling toward the end surface 21 is diffused by the diffusion surface 25, whereby the brightness of the immediate vicinity of the light emission direction of the LED light source 30 and the peripheral portion thereof is increased. The difference can be reduced.

  The planar shape of the diffusion surface 25 is a triangle as shown in the figure. The light emitted from the LED light source 30 becomes darker as the distance from the LED light source 30 increases, and the difference in brightness from the surroundings decreases as the distance from the LED light source 30 increases. Therefore, it is more preferable for light equalization to gradually reduce the area of the diffusion surface as the distance from the LED light source 30 increases. Therefore, it is not always necessary to use a triangle in this sense.

  Note that a diffusion surface 25 is formed on the light guide plate 20 described in the fifth embodiment. The diffusion surface 25 is configured by a fine uneven surface formed by the roughening process, but the diffusion surface 25 is not a fine uneven surface by such a roughening process, for example, a plurality of fine uneven surfaces. The brightness of the first main surface 23 that is the light exit surface of the light guide plate 20 can be made uniform by forming the lens-shaped uneven portion or the like. This will be described with reference to examples. FIG. 10 is a partial plan view showing a light guide plate 20 according to another example of the fifth embodiment. A diffusion surface 25 is formed on the light guide plate 20. The diffusion surface 25 is formed on the first main surface 23 that faces the light incident surface 52 (see FIGS. 8 and 9) of the ridge 51 of the diffusion plate 50. Each of the illustrated dots is formed of a fine concavo-convex portion having a convex lens shape, a concave lens shape, or a conical shape. In the following description, the concavo-convex portion will be described as the convex portion 28 having a convex lens shape.

  The diffusion surface 25 is formed between adjacent LED light sources 30. The formation range is substantially the same as that of the fifth embodiment (see FIG. 9), but it is also disposed on the end surface 29a side where the LED light source 30 is not disposed, and on the end surface 29b side (not shown) facing the end surface 29a. The In the diffusing surface 25, as shown in FIG. 10, the aggregate of the convex portions 28 is denser toward the side closer to the end surface 21 where the LED light source 30 is disposed, which is an intermediate position between the adjacent light sources 30. Is arranged. The position where the convex portions 28 are dense is an intermediate position between the LED light sources 30 and is a position where the distance from the LED light sources 30 becomes dark. Further, the aggregate of the convex portions 28 is arranged so as to become rougher as the distance from the intermediate position or the end surface 21 increases.

  In addition, although illustration is abbreviate | omitted, it is good also as a structure which provides a V-shaped groove | channel other than a convex lens shape, a concave lens shape, and a cone-shaped uneven part. For example, the V-shaped groove can have the same shape as the V-shaped groove 58 shown in FIG. 6 and has a prism effect. However, the V-shaped grooves are arranged so as to spread radially from the position where the convex portions 28 gather most densely within the range of the illustrated diffusion surface 25.

  According to the present embodiment described above, the diffusion surface 25 formed by an aggregate of convex lens shape, concave lens shape, conical uneven portion and V-shaped groove is provided, and these aggregates are adjacent LED light sources. It is arranged so as to be denser as it is closer to the end face 21 where the LED light sources are arranged at an intermediate position between 30, and is arranged so as to become rougher as it is farther from the intermediate position or the end face 21. By doing in this way, the fall of the brightness in the position which becomes dark between the LED light sources 30 and the edge part position where the LED light sources 30 are not arranged is reduced, and the first main surface 23 which is the light emitting surface of the light guide plate 20 is reduced. Brightness can be leveled.

Furthermore, as shown in FIG. 10, convex portions 28 (convex lens shape, concave lens shape, conical shape, etc.) are also scattered in the central portion of the first main surface 23 of the light guide plate 20 (a wide area region without the diffusion surface 25). I am letting. In this way, by causing the projections 28 to be scattered, the occurrence of uneven color can be suppressed.
In addition, the convex part 28 arrange | positioned between the adjacent LED light sources 30 may be one.

(Sixth embodiment)
Next, an illumination module 6 according to a sixth embodiment of the present invention will be described with reference to FIG. The illumination module 6 of the sixth embodiment is mainly different from the first embodiment in the configuration of the diffusion plate 50 and the light guide plate 20. Specifically, the illumination module 6 of the sixth embodiment includes the diffusion plate 50 (see FIG. 4) of the second embodiment and the light guide plate 20 of the fifth embodiment (FIG. 8, FIG. 9, or 10)). Therefore, the difference will be mainly described while comparing with the second and fifth embodiments. Parts common to the second and fifth embodiments and functionally similar parts are denoted by the same reference numerals, and description thereof is omitted or simplified.

  FIG. 11 is a partial plan view showing a part of the first light source unit 11 on the left side of the illumination module 6 according to the sixth embodiment of the present invention. As in the first embodiment, the illumination module 6 supports the light guide plate 20, the plurality of LED light sources 30 arranged along the end surface 21 of the light guide plate 20, and the LED light sources 30, and the light guide plate 20. A frame 40 that shields light from the peripheral edge 26 of the light source, and a diffusion plate 50 that is disposed so as to overlap the light guide plate 20.

  As in the fifth embodiment, the light guide plate 20 has a diffusion surface 25 formed on the first main surface 23 facing the light incident surface 52 of the ridge 51. On the diffusion surface 25, for example, a fine uneven surface in the form of dots is formed by roughening a predetermined position of the first main surface 23. As shown in FIG. 11, the diffusion surface 25 is formed between adjacent LED light sources 30. The formation range is a range between the end surface 21 on which the light from the LED light source 30 is incident and a position hitting the lower side of the inner side surface 54 of the first main surface 23, and forms a triangle with the end surface 21 side as a base. ing.

  As in the second embodiment, the diffuser plate 50 is provided with corrugated irregularities 57 along the arrangement direction of the plurality of LED light sources 30 on the inner side surface 54 of the ridge 51.

  In the illumination module 6 of the sixth embodiment, the light emission direction of the LED light source 30 is formed on the first main surface 23 which is a light emission surface by forming the diffusion surface 25 on the first main surface 23 of the light guide plate 20. The difference in brightness between the immediate vicinity and the surrounding area can be reduced. In addition, by forming the corrugated irregularities 57 on the inner side surface 54 of the convex portion 51, the light incident from the first main surface 23 of the light guide plate 20 is diffused on the irregularities 57 surface, so that the convex stripes are formed. The peripheral part of the diffusing plate 50 where the part 51 is disposed is brightened. Thus, the peripheral portion of the diffusion plate 50 is formed by a synergistic effect of providing the diffusion surface 25 on the first main surface 23 of the light guide plate 20 and providing the corrugated unevenness 57 on the inner side surface 54 of the diffusion plate 50. The brightness of the entire light exit surface including the peripheral portion of the diffuser plate 50 can be equalized without darkening as if the frame was trimmed.

(Seventh embodiment)
Next, the illumination module 7 which concerns on the 7th Embodiment of this invention is demonstrated with reference to FIG. The illumination module 7 of the seventh embodiment is different from the first embodiment mainly in the configuration of the diffusion plate 50 and the light guide plate 20. Specifically, the illumination module 7 of the seventh embodiment includes a diffusion plate 50 (see FIGS. 4 and 5) of the third embodiment and a light guide plate 20 of the fifth embodiment (FIGS. 7 and 5). 8)). Therefore, the difference will be mainly described while comparing with the third and fifth embodiments. Portions common to the third and fifth embodiments and functionally similar portions are denoted by the same reference numerals, and descriptions thereof are omitted or simplified.

  FIG. 12 is a partial plan view showing a part of the first light source unit 11 on the left side of the illumination module 7 according to the seventh embodiment of the present invention. The illumination module 7 supports the light source plate 20 while supporting the light source plate 20, the plurality of LED light sources 30 arranged along the end surface 21 of the light guide plate 20, and the LED light source 30, as in the first embodiment. A frame 40 that shields light from the peripheral edge 26 of the light source, and a diffusion plate 50 that is disposed so as to overlap the light guide plate 20.

  As in the fifth embodiment, the light guide plate 20 has a diffusion surface 25 formed on the first main surface 23 facing the light incident surface 52 of the ridge 51. For example, the diffusing surface 25 is formed with a fine uneven surface in a dot shape by roughening a predetermined position of the first main surface 23. As shown in FIG. 12, the diffusion surface 25 is formed between the adjacent LED light sources 30. The range of formation is that the end surface 21 on which the light from the LED light source 30 is incident and the inner side surface of the first main surface 23. 54 is a range between the position corresponding to the position below 54 and a triangle with the end face 21 side as a base.

  Similarly to the third embodiment, the diffusion plate 50 has a light incident surface 52 that crosses the projection 51 (from the outer peripheral end surface 53 to the inner side surface 54). ) A V-shaped groove 58 is formed.

  The illumination module 7 according to the seventh embodiment forms the diffusion surface 25 between the LED light sources 30 adjacent to each other on the first main surface 23 of the light guide plate 20. It is possible to reduce the difference in brightness between the immediate vicinity in the light emission direction and the surrounding area. Further, by forming a V-shaped groove 58 on the light incident surface 52 of the ridge 51 of the diffuser plate 50, the light incident from the first main surface 2 of the light guide plate 20 is V-shaped groove 58. Therefore, the peripheral edge of the diffusion plate 50 can be brightened. Therefore, the diffusion plate 25 has a synergistic effect of providing the diffusion surface 25 on the first main surface 23 of the light guide plate 20 and providing the V-shaped groove 58 on the light incident surface 52 of the convex portion 51 of the diffusion plate 50. It is possible to eliminate the darkening as if the peripheral edge portion of the 50 is edged and to uniform the brightness of the entire light emitting surface including the peripheral edge portion of the diffusion plate 50.

(Eighth embodiment)
Next, the illumination module 8 which concerns on the 8th Embodiment of this invention is demonstrated with reference to FIG. The illumination module 8 of the eighth embodiment is mainly different from the first embodiment in the configuration of the diffusion plate 50 and the light guide plate 20. Specifically, the lighting module 8 according to the eighth embodiment includes the diffusion plate 50 (see FIG. 7) according to the fourth embodiment and the light guide plate 20 according to the fifth embodiment (see FIG. 8, FIG. 9 or FIG. 9). 10)). Therefore, the different parts will be mainly described while comparing with the fourth and fifth embodiments. Parts common to the fourth and fifth embodiments and functionally similar parts are denoted by the same reference numerals, and description thereof is omitted or simplified.

  FIG. 13 is a partial plan view showing a part of the first light source unit 11 on the left side of the illumination module 8 according to the eighth embodiment of the present invention. The illumination module 7 supports the light source plate 20 while supporting the light source plate 20, the plurality of LED light sources 30 arranged along the end surface 21 of the light guide plate 20, and the LED light source 30, as in the first embodiment. A frame 40 that shields light from the peripheral edge 26 of the light source, and a diffusion plate 50 that is disposed so as to overlap the light guide plate 20.

  Similar to the fifth embodiment, the light guide plate 20 has a diffusion surface 25 formed on the first main surface 23 facing the light incident surface 52 of the ridge 51. For example, the diffusing surface 25 is formed with a fine uneven surface in a dot shape by roughening a predetermined position of the first main surface 23. As shown in FIG. 11, the diffusion surface 25 is formed between adjacent LED light sources 30. The formation range is a range between the end surface 21 on which the light from the LED light source 30 is incident and a position hitting the lower side of the inner side surface 54 of the first main surface 23, and forms a triangle with the end surface 21 side as a base. ing.

  The diffusing plate 50 includes corrugated irregularities 57 formed on the convex strips 51 of the second embodiment and V-shaped grooves 58 formed on the convex strips 51 of the third embodiment. It is used together. The corrugated irregularities 57 are formed on the inner side surface 54 of the ridge 51 along the arrangement direction of the plurality of LED light sources 30. The V-shaped groove 58 is formed on the light incident surface 52 of the ridge 51 so as to cross the ridge 51 (from the outer peripheral end surface 53 to the inner side surface 54).

  In the lighting module 8 of the eighth embodiment, the diffusion surface 25 is formed between the adjacent LED light sources 30 of the first main surface 23 of the light guide plate 20, so that the first main surface 23 that is a light emitting surface is formed. The difference in brightness between the immediate vicinity of the light emission direction of the LED light source 30 and its surroundings can be reduced.

  In addition, by forming the corrugated unevenness 57 on the inner side surface 54 of the ridge 51 of the diffusing plate 50, the light is diffused by the concavo-convex 57 and reflected into the ridge 51, thereby Brighten the periphery.

  Further, by forming the V-shaped groove 58 on the light incident surface 52 of the ridge 51, the light emitted from the light guide plate 20 is diffused by the light incident surface 52 of the ridge 51, The peripheral edge of the diffusion plate 50 where the ridges 51 are arranged is brightened.

  Accordingly, diffusion is achieved by a synergistic effect of providing the diffusion surface 25 on the first main surface 23 of the light guide plate 20 and providing the corrugated projections and depressions 57 and the V-shaped grooves 58 on the ridges 51 of the diffusion plate 50. It is possible to eliminate the darkening as if the peripheral portion of the plate 50 was trimmed, and to uniform the brightness of the entire light emitting surface including the peripheral portion of the diffusion plate 50.

(Ninth embodiment)
Next, the illumination module 9 which concerns on the 9th Embodiment of this invention is demonstrated with reference to FIG. The ninth embodiment is an application example of the first to eighth embodiments described above, and in addition to the diffusion plate 50, a diffusion plate 80 is also provided on the back side of the light guide plate 20. The difference is that light can be emitted from both the front and back surfaces (up and down). Therefore, the difference will be mainly described. In addition, the same code | symbol is attached | subjected to the part which is common in 1st Embodiment, and the description is abbreviate | omitted or simplified.

  FIG. 14 is a partial cross-sectional view showing the first light source unit 11 on the left side of the illumination module 9 according to the ninth embodiment. The illumination module 9 supports the LED light source 20, the plurality of LED light sources 30 arranged along the left side end face 21 of the light guide plate 20, and the LED light source 30, and the peripheral portion on the left side of the light guide plate 20. 26, a light shielding plate 50, a diffusion plate 50 arranged on the first main surface 23 side of the light guide plate 20, a diffusion plate 80 arranged on the second main surface 24 side, and the like. Note that the diffusion plate 50 and the diffusion plate 80 can have common specifications.

  As in the first embodiment, the light guide plate 20 is opposed to the left-side end surface 21 and the right-side end surface 22 (see FIG. 1) on which light emitted from the LED light source 30 is incident, and the diffusion plate 50. A first main surface 23 and a second main surface 24 facing the first main surface 23 are provided. Similarly to the first embodiment (see FIG. 1), a plurality of LED light sources 30 are arranged along the left-side end face 21 of the light guide plate 20 with a substantially constant interval. A plurality of LED light sources 30 are also arranged on the end face 22 with substantially constant intervals. The LED light source 30 is disposed substantially at the center of the light guide plate 20 in the thickness direction.

  The frame 40 includes a base 41 along the end surface 21 on the left side, a light shield 42 extending from the base 41 to the first main surface 23 of the light guide plate 20, and a light shield 43 extending to the second main surface 24. And. Note that the description on the right side is omitted because it has the same configuration. In the light shielding part 42, the light emitted from the LED light source 30 is not directly incident on the diffusion plate 50, and in the light shielding part 43, the light emitted from the LED light source 30 is not incident on the diffusion plate 80 as it is. Shielded.

  A ridge 51 projecting toward the first main surface 23 of the light guide plate 20 is formed at the peripheral edge of the diffusion plate 50 where the LED light source 30 is arranged, and the LED light source 30 of the diffusion plate 80 is arranged. On the peripheral edge portion, a ridge portion 81 protruding toward the second main surface of the light guide plate 20 is formed. The front end surfaces of the ridges 51 and 81 are light incident surfaces 52 and 82 on which light emitted from the light guide plate 20 is incident. The second main surface 24, which is the surface of the diffusion plate 50 opposite to the light guide plate 20, functions as a first emission surface, and the surface of the diffusion plate 80 opposite to the light guide plate 20 is a light emission surface 86. is there. The light incident surface 82 functions as a first light incident surface, and also functions as a light emitting surface 86 and a second light emitting surface.

  In the illumination module 9 of the ninth embodiment, the diffusion plate 50 is disposed on the first main surface side 23 of the light guide plate 20, and the diffusion plate 80 is further disposed on the second main surface 24 side of the light guide plate 20. It is a configuration. Therefore, in the illumination module 9 of the ninth embodiment, the light guide plate 20 and the diffusion plate 50 shown in each of the first to eighth embodiments can be adapted.

  The illumination module 9 according to the ninth embodiment described above can emit light from both the front and back surfaces, and both the light emission surfaces 56 and 86 can follow the configurations of the first to eighth embodiments. Therefore, it is possible to eliminate the darkening as if the peripheral portion of the diffusion plate 50 was trimmed, and to achieve a uniform brightness including the peripheral portion.

  In each of the above-described embodiments, an example in which the outer peripheral end surface 53 and the inner side surface 54 are parallel to each other is shown. However, they do not have to be arranged parallel to each other. By changing the angle of the outer peripheral end surface 53 or the inner side surface 54 with respect to the first main surface 23, the amount of light totally reflected by the outer peripheral end surface 53 or the inner side surface 54 and the direction of total reflection can be changed. Further, by making the light incident surface 52 parallel to the first main surface 23 or having an angle (non-parallel), the amount of light incident on the light incident surface 52 from the first main surface 23 can be reduced. Can be changed.

  In the first to ninth embodiments of the present invention, a single lighting module has been described. However, the present invention is effective in configuring a large-sized LED lighting device by arranging a plurality of lighting modules in parallel. It is. This will be described with reference to FIGS. 16 and 17.

(Panel-type lighting device)
FIG. 16 is a plan view showing an example of a panel illumination device 90 in which two illumination modules of the present invention are arranged in parallel. As shown in FIG. 16, the panel illumination device 90 is configured such that the illumination module 1 is in close contact with the outer peripheral end surfaces 53 of the diffusion plates 50 in the first light source units 11.

  As described above, the single illumination module 1 is not dark as if the peripheral portion of the light emitting surface is trimmed, and the brightness is uniform including the peripheral portion. Therefore, even when the two lighting modules 1 are juxtaposed, the large panel-type lighting device 90 having a good appearance can be realized without the joint portion being trimmed.

  As shown in FIG. 2 and the like, the outer peripheral end surface 53 which is the outer peripheral side surface on the side where the projecting portion 51 of the diffusion plate 50 is provided and the outer side surface 44 of the base portion 41 of the frame 40 are arranged in the same plane. . That is, the outer peripheral edge 59, which is the outer peripheral edge of the light emitting surface 56, is disposed in the same plane as the outer surface 44. Therefore, when the illumination modules 1 are arranged in parallel, the gap between the light emission surfaces 56 arranged in parallel can be reduced. Therefore, the light emission surfaces 56 are continuously connected, and the gap between the parallel light emission surfaces 56 is reduced. An inconspicuous large panel lighting device 90 can be realized.

  In addition, as the panel type illuminating device 90, the way of arranging the illumination modules 1 is not limited. For example, the number of arrangement of the lighting modules 1 may be three or more, and the direction of the arrangement is not particularly limited. For example, the first light source unit 11 and the second light source unit 12 may be arranged in close contact, and the first light source unit 11 or the second light source unit 12 may be arranged in close contact with other sides.

  When a plurality of single illumination modules are arranged in parallel, the positions of the outer peripheral edges 59 of the four sides of the diffusion plate 50 are made to coincide with the positions of the outer surface 44 of the frame 40 and the outer peripheral end surface 27 of the light guide plate 20 or protrude. The outer peripheral edges 59 of the diffusion plate 50 are brought into close contact with each other. By doing so, the gap between the adjacent diffusion plates 50 is eliminated, and the brightness of the entire light exit surface 56 is equalized without darkening the peripheral portions of the individual diffusion plates 50. It is possible to realize the panel-type lighting device 90 having the same.

  FIG. 16 shows a panel type lighting device 91 in which four lighting modules of the present invention are arranged in parallel. The upper part (a) is a layout diagram of light sources, the interruption (b) is a brightness distribution diagram of the lighting module alone, and the lower part (c ) Is a distribution diagram of brightness when two illumination modules are arranged in parallel. In addition, FIG.16 (b) and FIG.16 (c) are schematic diagrams when the AA direction in Fig.16 (a) is visually recognized. As shown to 16 (a), the panel-type illuminating device 91 makes the illumination module 1 the horizontal direction, the 2nd light source part 12 on the right side, and the opposing end surface of the 1st light source part 11 on the left side are closely_contact | adhered. In the vertical direction, the end surface 29a and the end surface 29b on the side where the LED light source 30 of the light guide plate 20 is not disposed are brought into close contact with each other, and four illumination modules 1 are arranged in parallel two by two.

  Next, the brightness distribution of the lighting module 1 will be described. As shown in FIG. 16B, the brightness distribution when the illumination module 1 is a single unit is different between the end face 29a and the end face 29b on the side where the LED light source 30 of the diffusion plate 50 is not disposed. Light leaks from the end face, and the light exit surface 56 is not suitable for irradiation. For this reason, in the position close to the end faces 29a and 29b of the light emitting surface 56, it becomes darker than the brightness of the central portion. In the drawing, light leakage from the end faces 29a and 29b is schematically shown by broken lines.

  However, when the end face 29a and the end face 29b of the diffuser plate 50 are brought into close contact with each other, the light leaking from the end face 29a of the left illumination module 1 as shown in FIG. (Represented by a counterclockwise arrow in the figure). Further, the light leaking from the end surface 29b of the right illumination module 1 is incident from the end surface 29a of the left illumination module 1 (indicated by a clockwise arrow in the drawing).

  Thus, if the end surfaces on the side where the LED light source 30 is not disposed are brought into close contact with each other, the brightness of the light emitting surface 56 is not reduced even in the connection portion when the illumination modules 1 are arranged in parallel. It is possible to realize a panel type lighting device 91 in which is uniformed.

  As in this embodiment, in order to closely contact the end surfaces where the LED light source 30 is not disposed, the positions of the end surfaces 29a and 29b of the light guide plate 20 are set to the positions of the outer peripheral end surfaces 59 of the diffusion plate 50 at the same positions as the end surfaces 29a and 29b. Match the positions. However, when the outer peripheral end surfaces 59 of the two diffusion plates 50 are brought into close contact with each other, even if there is a slight gap between the end surface 29a and the end surface 29b of the light guide plate 20, the above effect can be exhibited.

  Although FIG. 16A shows an example in which four illumination modules are arranged in parallel, the number of illumination modules is not limited by the above-described configuration, and a larger panel illumination device can be provided. In FIG. 16A, the arrangement position of the LED light source 30 of the first light source unit 11 on the left side is arranged between the arrangement positions of the LED light sources 30 of the second light source unit 12 on the right side. If it does in this way, the fall of the brightness between the LED light sources 30 of the 1st light source part 11 can be supplemented with the LED light sources 30 of the 2nd light source part 12. FIG. The LED light source 30 of the first light source unit 11 on the left side and the LED light source 30 of the second light source unit 12 on the right side are arranged at the same position (that is, the LED light source 30 of the first light source unit 11). Even if the second light source unit 12 is disposed so as to face each other, the brightness of the connection part of the adjacent light guide plate 20 is not lowered, and the center of the first main surface 23 that is the light emission surface of the light guide plate 20 is reduced. The same brightness as the part.

  Moreover, the panel type illuminating device which can light-emit both large-sized front and back can also be implement | achieved by arranging in parallel the plurality of illumination modules 9 which can emit both front and back surfaces shown in the ninth embodiment.

  Further, when the plurality of illumination modules 1 are arranged in parallel, the height of the light emitting surface 56 may be changed for each illumination module 1 within the range of the thickness of the diffusion plate 50.

  The panel illumination devices 90 and 91 illustrated in FIG. 15 and FIG. 16 exemplify the illumination module 1 of the first embodiment, but have the configuration shown in the second to eighth embodiments. Each lighting module can be enlarged in the same way.

  In the above-described embodiment, the diffusion plate 50 is shown as an example of a quadrangle in plan view, but may be a polygon such as a triangle or a pentagon.

  In each of the above-described embodiments, the light shielding unit 42 that restricts the amount of light emitted from the peripheral portion 26 and entering the second light incident surface 52 is provided between the peripheral portion 26 and the second light incident surface 52. However, the light shielding part 42 may not be provided. Even when the light shielding portion 42 is not provided, by providing the ridge 51 on the diffusion plate 50, the light emitted from the peripheral portion 26 enters the light incident surface 52 and the peripheral edge of the light emitting surface 56. The light can be emitted from the part. Therefore, light can be emitted from the entire surface of the light emitting surface 56. However, when adjustment of the amount of light incident on the light incident surface 52 is necessary, the amount of light emitted from the peripheral portion 26 (first main surface 23) and incident on the light incident surface 52 is adjusted by providing the light shielding portion 42. it can. That is, the amount of light emitted from the peripheral portion 26 of the light exit surface 56 of the diffuser plate 50 can be adjusted.

  In addition, the light guide plate 20 and the diffusion plate 50 are configured to scatter light traveling inside the light guide plate 20 and the diffusion plate 50 by containing light scattering particles. The first main surface 23 that is a surface and the light exit surface 56 of the diffuser plate 50 are formed by forming a fine concavo-convex shape to roughen the surface, or a convex lens shape, a concave lens shape, and a conical shape. Or a V-shaped groove may be formed. By forming such a fine concavo-convex shape, even the transparent light guide plate 20 and the diffusion plate 50 that do not contain light scattering particles can scatter light on the first main surface 23 and the light exit surface 56. it can.

  The light scattering particles described above can be formed by, for example, silicone particles described below. The light guide 20, the diffusion plate 50, and the diffusion plate 80 (hereinafter referred to as the light guide plate 20) are light guides provided with a volumetric uniform scattering ability, and are spherical as light scattering particles. Contains many particles. When light enters the light guide 20 or the like, the light is scattered by silicone particles (light scattering particles).

  Here, the Mie scattering theory that gives the theoretical basis of the light scattering particles (silicone particles) will be described. Mie scattering theory is the solution of Maxwell's electromagnetic equation for the case where spherical particles (light scattering particles) having a refractive index different from that of the medium exist in a medium (matrix) having a uniform refractive index. is there. The intensity distribution I (Α, Θ) depending on the angle of the scattered light scattered by the light scattering particles corresponding to the light scattering particles is expressed by the following equation (1). Α is a size parameter indicating the optical size of the light scattering particle, and is an amount corresponding to the radius r of the spherical particle (light scattering particle) normalized by the wavelength λ of light in the matrix. The angle Θ is a scattering angle, and the same direction as the traveling direction of incident light is Θ = 0 °.

Further, i ₁ and i ₂ in the formula (1) are represented by the formula (4). And a and b with subscript ν in the expressions (2) to (4) are expressed by the expression (5). P (cos Θ) with superscript 1 and subscript ν is Legendre's polynomial, a and b with subscript ν are first-order and second-order Recati-Bessel functions Ψ _* , ζ _* (where “*” Means the subscript ν) and its derivative. m is the relative refractive index of the light-scattering particles based on the _matrix , and m = n _scatter / n _matrix . Note that m is the relative refractive index of the light scattering particles with reference to the _matrix, and has a relationship of m = n _scatter / n _matrix with the refractive index n _{matrix of the matrix} and the refractive index n _scatter of the light scattering particles.

  FIG. 17 is a graph showing the intensity distribution I (Α, Θ) by a single true spherical particle based on the above equations (1) to (5). FIG. 17 shows the angular distribution I (Α, Θ) of the scattered light intensity when there is a true spherical particle as the light scattering particle at the position of the origin G and the incident light is incident from below in FIG. The distance from the origin G to each curve is the scattered light intensity in each scattering angle direction. One curve is scattered light intensity when Α is 1.7, another curve is scattered light intensity when と き is 11.5, and another curve is scattered light when Α is 69.2. It is strength. In FIG. 17, the scattered light intensity is shown on a logarithmic scale. For this reason, the portion that appears as a slight difference in intensity in FIG. 17 is actually a very large difference.

  As shown in FIG. 17, the larger the size parameter Α (the larger the particle size of the true spherical particle when considered at a certain wavelength λ), the more upward in FIG. 17 (forward in the irradiation direction). It can be seen that light is scattered with high directivity. Actually, the angle distribution I (Α, Θ) of the scattered light intensity is determined by setting the radius r of the scatterer and the relative refractive index m of the medium and the light scattering particles as parameters if the incident light wavelength λ is fixed. Can be controlled.

  When light enters such a light guide plate 20 or the like containing N single true spherical particles, the light is scattered by the true spherical particles. The scattered light travels through the light guide plate 20 and the like, and is scattered again by other true spherical particles. When particles are added at a volume concentration of a certain level or more, such scattering is sequentially performed a plurality of times, and then light is emitted from the light guide plate 20 or the like. A phenomenon in which such scattered light is further scattered is called a multiple scattering phenomenon. In such multiple scattering, analysis by a ray tracing method with a transparent polymer is not easy. However, the behavior of light can be traced by the Monte Carlo method and its characteristics can be analyzed. According to this, when the incident light is non-polarized light, the cumulative distribution function F (Θ) of the scattering angle is expressed by the following equation (6).

Here, I (Θ) in the equation (6) is the scattering intensity of the true spherical particle having the size parameter 表 represented by the equation (1). If light of intensity _Io enters the light guide plate 20 and the like, passes through the distance y, and then the intensity of light attenuates to I due to scattering, these relationships are expressed by the following equation (7).

Τ in the equation (7) is called turbidity and corresponds to the scattering coefficient of the medium, and is proportional to the number N of particles as in the following equation (8). In the equation (8), σ ^s is a scattering cross section.

From the equation (7), the probability P _t (L) of transmitting through the light guide plate 20 having a length L without scattering is expressed by the following equation (9).

On the other hand, the probability P _s (L) that is scattered up to the optical path length L is expressed by the following equation (10).

  As can be seen from these equations, the degree of multiple scattering in the light guide plate 20 or the like can be controlled by changing the turbidity τ.

  According to the above relational expression, multiple scattering within the light guide plate 20 or the like can be controlled using at least one of the size parameter Α and turbidity τ of the light scattering particle as a parameter.

  Here, the light scattering particles contained in the light guide plate 20 and the like can be, for example, translucent silicone particles having an average particle diameter of 2.4 μm. The turbidity τ, which is a scattering parameter corresponding to the scattering coefficient by the light scattering particles, can be set to τ = 0.49 (λ = 550 nm).

(Tenth embodiment)
Next, an illumination module 10 according to a tenth embodiment of the present invention will be described with reference to FIGS. 18 and 19. FIG. 18 shows a cross-sectional configuration of a surface along the vertical direction of the illumination module 10 (a surface perpendicular to the light emitting surface 56 of the diffuser plate 50). In order to make the drawing easy to understand, the left and right end portions are enlarged and the central portion is omitted. FIG. 19 schematically shows the traveling state and reflection state of light in the illumination module 10. 18 and 19, the same components as those of the lighting module 1 are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  The illumination modules 1 to 9 described above have a configuration in which LED light sources 30 are provided on the end surface 21 and the end surface 22 of the light guide plate 20 facing each other. On the other hand, the illumination module 10 is configured to include a reflection plate 100 as a reflection member on the end face 22 instead of the LED light source 30. The illumination module 10 includes a holding case 101 that holds the light guide plate 20, the LED light source 30, the reflector 100, the control circuit 70, and the like.

  The light emitted from the LED light source 30 and incident on the light guide plate 20 from the end face 21 is scattered by the light scattering particles in the light guide plate 20 as described above, and also on the first main surface 23 and the second main surface 24. Proceed while repeating total reflection. A part of the light traveling in the light guide plate 20 is emitted in a diffused state from the first main surface 23 to the diffusion plate 50 side while traveling in the light guide plate 20. Further, another part of the light traveling in the light guide plate 20 reaches the reflection plate 100 and is reflected toward the light guide plate 20 by the reflection plate 100.

  A part of the light reflected toward the light guide plate 20 by the reflecting plate 100 is, for example, light scattered in the light guide plate 20 in the same manner as the light emitted from the LED 30 and incident on the end face 21 as indicated by a broken line L3. While being scattered by the particles, and proceeding while repeating total reflection at the first main surface 23 and the second main surface 24, and while traveling through the light guide plate 20, the diffusion state from the first main surface 23 to the diffusion plate 50 side It is emitted at. Another part of the light reflected toward the inside of the light guide plate 20 by the reflecting plate 100 enters the ridge 51 from the light incident surface 52 as indicated by a broken line L4, for example. The light travels while being totally reflected by the inner side surface 54 and the outer peripheral end surface 53 and while being scattered by the light scattering particles, and mainly above the arrangement region of the ridges 51 of the light emitting surface 56 of the diffusion plate 50, that is, the light emitting surface 56. The light is emitted in a diffused state from the peripheral portion on the side where the reflecting plate 100 is disposed. That is, the illuminance on the side of the end surface 22 of the diffusion plate 50 can be improved without providing the LED light source 30 on the end surface 22. Thereby, compared with the structure provided with two or more LED light sources 30, the reduction | decrease in the number of parts and the simplification of a structure are achieved for the illumination module 10. FIG.

  In addition, the reflecting plate 100 is comprised with an aluminum plate, for example, can be affixed on the end surface 22, or can be attached to the light-guide plate 20 with the holder which abbreviate | omits illustration. Moreover, it can also comprise by apply | coating the paint which has reflectivity to the end surface 22. FIG.

  Moreover, when it is set as the structure provided with the LED light source 30, the part of the LED light source 30 may look like a point light source from the light-projection surface 56 side of the diffusion plate 50. FIG. In order to prevent this, the light emitted from the LED light source 30 is not directly incident on the diffusion plate 50, and is disposed between the light guide plate 20 and the convex portion 51 of the diffusion plate 50 on the end surface 21 side where the LED light source 30 is provided. The light shielding part 42 is provided. However, the light emitted from the LED light source 30 and entering the light guide plate 20 is scattered by the light scattering particles in the light guide plate 20, and reaches the end face 22 in a state where the illuminance is uniformed. Reflected by the reflector 100. Therefore, unlike the end face 21 side on which the LED light source 30 is provided, it is not necessary to provide the light shielding part 42 on the end face 22 side, and the lighting module 10 has a reduced number of parts and simplified configuration. It will be a thing.

  Moreover, when it is set as the structure provided with the LED light source 30, it may become bright in the immediate vicinity of the light emission direction of the LED light source 30, and it may become dark in the peripheral part (for example, area | region between adjacent LED light sources 30) shifted | deviated from the light emission direction. is there. In order to prevent this, a diffusion surface 25 is formed on the end surface 21 side of the first main surface 23 of the light guide plate 20 as shown in FIGS. However, the light emitted from the LED light source 30 and entering the light guide plate 20 is scattered by the light scattering particles in the light guide plate 20, and reaches the end face 22 in a state where the illuminance is uniformed. Reflected by the reflector 100. Therefore, it is not necessary to form the diffusing surface 25 on the end surface 22 of the first main surface 23 of the light guide plate 20, and the illumination module 10 is simplified in configuration.

  In addition, by setting it as the following structure, reduction of the illumination intensity difference of the illumination intensity by the side of the end surface 21 and the illumination intensity by the side of the end surface 22 can be aimed at effectively. That is, the ratio of the amount of light returning to the end surface 21 with respect to the amount of light incident on the end surface 21 when the light guide plate 20 is not formed with the diffusion surface 25 and the area of the first main surface 23. Then, the reflectance of the reflecting plate 100 and the concentration of the light scattering member contained in the light guide plate 20 are set so that the ratio of the area of the dark region between the adjacent LED light sources 30 becomes equal. Thereby, reduction of the illuminance difference between the illuminance on the end face 21 side and the illuminance on the end face 22 side can be achieved. Specifically, for example, as shown in FIG. 19, the amount of light L5 that enters the end surface 21 from the LED light source 30 and travels through the light guide plate 20 is changed to the amount of light incident on the end surface 21 when reaching the end surface 22. The light intensity of the light L6 reflected by the reflecting plate 100 and reaching the end face 21 is set to 15% with respect to the light quantity when incident on the end face 21, so that the illuminance on the end face 21 side And the illuminance difference between the illuminance on the side of the end face 22 can be suitably reduced. The amount of light L5 that enters the end surface 21 from the LED light source 30 and travels through the light guide plate 20 is 40% or less and 15% or more with respect to the amount of light that is incident on the end surface 21 when reaching the end surface 22. The light intensity of the light L6 reflected by the reflecting plate 100 and reaching the end face 21 is set to 15% or less and 0.4% or more with respect to the light quantity when incident on the end face 21, so that the illuminance on the end face 21 side and the end face The illuminance difference from the illuminance on the 22 side can be reduced.

  The amount of light incident on the light incident surface 52 from the end surfaces 21 and 22 where the LED light source 30 is disposed is as follows with respect to the total amount of light incident on the diffusion plate 50 (total incident amount M). By setting the amount of light, the illuminance distribution on the light exit surface 56 can be made uniform. That is, as shown in FIG. 20, when the area of each incident light incident surface 52 is S1, and the area of the inner bottom surface 55 is S2, the light incident surface 52 has M · (S1 / (S1 + S2)). By making this amount of light incident, the illuminance distribution on the light exit surface 56 can be made uniform.

Human average vision is difficult to recognize as a change even if the amount of light changes by about 30%. Therefore, the light incident surface 52 and the light incident surface 52 are set so that the amount of light incident on the light incident surface 52 is 0.7 · M · (S1 / (S1 + S2)) to 1.3 · M · (S1 / (S1 + S2)). By setting the area of the light emitting surface 56, it is possible to make it appear to the observer that light is emitted from the light emitting surface 56 with a uniform illuminance distribution.
Further, when a plurality of lighting devices are used side by side as shown in FIG. 15, since there is light leaking from the adjacent lighting device, a change in the amount of light at the peripheral portion can be allowed to about 60%. For this reason, the light incident surface 52 and the light incident surface 52 are set so that the amount of light incident on the light incident surface 52 is 0.4 · M · (S1 / (S1 + S2)) or more and 1.6 · M · (S1 / (S1 + S2)) or less. By setting the area of the light emitting surface 56, it is possible to make it appear to the observer that light is emitted from the light emitting surface 56 with a uniform illuminance distribution.

  Further, by adopting the configuration shown in FIG. 21, the illuminance distribution of the light emitted from the light emitting surface 56 is preferably uniform. That is, the light guide plate 20 is composed of a light scattering light guide (HSOT) in which light scattering particles (HSOT) having a particle diameter of 7 μm and a concentration of 0.1 wt% are mixed with a PMMA (Poly methyl methacrylate) base material. Further, the diffusion plate 50 is constituted by a light scattering light guide (HSOT) in which light scattering particles (HSOT) are mixed in a PMMA or polycarbonate base material at a concentration of an average free path of 0.1 mm or less. The left-right width W1 (see FIG. 20) of the diffusion plate 50 is 150 mm, the left-right width W2 (see FIG. 20) of the light incident surface 52 is 3 mm, and the left-right width W3 of the incident region C is further set. By setting the thickness to 1.5 mm, it is possible to allow light having a light amount of 2% of the total incident amount M to be incident on the convex portion 51 and to make uniform the illuminance distribution of the light emitted from the light exit surface 56. can do. 2% of the total incident amount M corresponds to a light amount of (S1 / (S1 + S2)) with respect to the total incident amount M. As shown in FIG. 21, the specific dimensions of each part of the illumination module 1 are as follows: the diffusion plate 50 has a thickness of 3.0 mm, the recess 50A has a depth of 2.5 mm, and the light guide plate 20 has a thickness of 2. 0.0 mm, and the thickness of the reflector 60 is 1.0 mm.

1 to 9 .. Illumination module (first embodiment to ninth embodiment)
11 .. First light source part (on the left side) 12 .. Second light source part (on the right side) 20 .. Light guide plate 21 .. End face (on the left side) 23 .. First main surface (first light emission) surface)
25 .. Diffuse surface 26 .. Peripheral edge portion of light guide plate 27 .. Outer peripheral edge surface of light guide plate 28 .. Uneven portion 29 a, 29 b .. End surface 30 .. LED light source (light source)
40. ・ Frame (Mounting member)
42 .. Light shielding part 42 a.. Convex part 42 b.. Concave part 50.. Diffuser plate 51.
53 .. Outer end face 54 .. Inside side face 55 .. Light incident surface (first light incident surface)
56 .. Light exit surface (second light exit surface)
57..Wave shaped irregularities 58..V-shaped groove 59..Outer peripheral edge of diffuser plate 60..Reflector plate 100.

Claims (15)

A light guide plate having an end surface and a first light exit surface;
A light source that is arranged along the end face and that receives light from the end face;
A first light incident surface that is disposed on the first light emitting surface side of the light guide plate and receives light emitted from the first light emitting surface, and a first light incident surface from which light incident from the first light incident surface is emitted. A diffuser having two light exit surfaces;
Have
The diffusion plate protrudes toward the light guide plate, and is provided at a position facing at least a peripheral portion on the end surface side where the light sources are arranged among peripheral portions of the first light emitting surface of the light guide plate. An illumination module comprising a convex portion having a second light incident surface on which light emitted from the portion is incident. A light guide plate having an end surface and a first light exit surface;
A light source that is arranged along a part of the end face and that receives light from the end face;
A reflecting member that is disposed on a part of the end surface other than the end surface on which the light source is disposed, and that reflects the light emitted from the light source and incident on the light guide plate;
A first light incident surface that is disposed on the first light emitting surface side of the light guide plate and receives light emitted from the first light emitting surface, and a first light incident surface from which light incident from the first light incident surface is emitted. A diffuser having two light exit surfaces;
Have
The diffusion plate protrudes toward the light guide plate, and is provided at a position facing at least a peripheral portion on the end surface side where the light sources are arranged among peripheral portions of the first light emitting surface of the light guide plate. An illumination module comprising a convex portion having a second light incident surface on which light emitted from the portion is incident. The illumination module according to claim 1 or 2,
A light shielding unit is provided between the peripheral edge and the second light incident surface to limit an amount of light emitted from the peripheral edge to be incident on the second light incident surface. Lighting module. The lighting module according to claim 3.
The light shielding part is provided in an attachment member for attaching the light source to the illumination module.
An illumination module characterized by that. In the illumination module according to any one of claims 1 to 4,
The light source comprises a plurality of light sources,
The light shielding part includes convex parts and concave parts arranged alternately along the arrangement direction of the plurality of light sources,
The light source is disposed within the formation range of the convex portion,
An illumination module characterized by that. In the illumination module according to any one of claims 1 to 5,
The diffuser plate is provided with corrugated irregularities formed on the inner side surface facing the outer peripheral end surface of the ridge portion so as to be along the arrangement direction of the plurality of light sources.
An illumination module characterized by that. In the illumination module according to any one of claims 1 to 5,
The diffusing plate includes a V-shaped groove that crosses the ridge on the light incident surface of the ridge.
An illumination module characterized by that. In the panel type illumination module according to claim 7,
The diffusion plate has the corrugated irregularities,
An illumination module characterized by that. The illumination module according to any one of claims 1 to 8,
The light guide plate includes a diffusion surface in a region facing the light incident surface of the ridge,
The diffusion surface is disposed between adjacent light sources of the plurality of light sources.
An illumination module characterized by that. The lighting module according to claim 9.
The diffusion surface is composed of a fine lens-shaped concavo-convex portion or an aggregate of V-shaped grooves,
An illumination module characterized by that. The lighting module according to claim 10.
The lens-shaped concavo-convex portion or the V-shaped groove on the diffusion surface is disposed so as to be denser toward an end surface side where the light source is disposed at an intermediate position between the adjacent light sources. Or it is arranged so as to become rough as it moves away from the end face position,
An illumination module characterized by that. The illumination module according to any one of claims 1 to 11,
The outer peripheral end surface of the diffusion plate is disposed in the same plane as the outer peripheral end surface of the light guide plate and the outer surface of the mounting member, or protrudes from the outer peripheral end surface of the light guide plate and the outer surface. ing,
An illumination module characterized by that. The illumination module according to any one of claims 1 to 12,
The ratio between the amount of light incident on the second light incident surface and the total amount of light incident on the diffuser is determined by the area of the second light incident surface and the area of the first light incident surface of the diffuser. And within 60% of the ratio of the total area of the second light incident surfaces,
An illumination module characterized by that. The illumination module according to any one of claims 1 to 13,
The light source is an LED light source,
An illumination module characterized by that.   A panel comprising a plurality of the illumination modules according to any one of claims 1 to 14 arranged so that end faces of the light guide plate on the side where the light source is not disposed are in close contact with each other. Type lighting device.

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