JPWO2010004610A1 - Light guide plate unit and lighting fixture using the light guide plate unit - Google Patents

Abstract

An object of the present invention is to provide a light guide plate unit capable of realizing light distribution suitable for performing space illumination and having excellent maintainability. For this purpose, a plurality of point light sources are arranged in a substantially straight line. A light source unit 14 that forms a linear light source, an incident end surface on which light from the light source unit is incident, an exit surface that is substantially orthogonal to the incident end surface and that emits light incident from the incident end surface, and faces the exit surface A light guide plate 16 having at least a reflection surface arranged to form a light scattering pattern, and the light scattering pattern of the light guide plate has a substantially central portion region of the exit surface denser than a peripheral portion region of the exit surface. It forms so that it may become.

Description

  The present invention relates to an edge light type light guide plate unit that emits light by using a light emitting diode as a light source and using a light guide plate, and a lighting fixture using the light guide plate unit.

  Conventionally, a light guide plate unit used for a backlight of a liquid crystal display device, an outdoor signboard, an indicator lamp, etc., for example, has a cold cathode tube having a linear shape or a plurality of point light sources such as light emitting diodes arranged in a substantially linear shape. The line light source is composed of a light guide plate made of a transparent acrylic plate or the like, and a light scattering pattern such as reflective dots formed on one plate surface (back surface) in a predetermined pattern, and the line light source is the light guide plate. The light emitted from the linear light source is incident on the side end surface of the light guide plate (referred to as the incident end surface), and the light incident on the light guide plate is scattered by the action of the reflective dots of the light guide plate, The light beam traveling direction is controlled so as to be emitted from the surface of the light guide plate (referred to as the light exit surface), and thus the entire light exit surface of the light guide plate is surface-emitted. DOO has been proposed, also, an illumination fixture using the light guide plate unit is put into practical use.

  A conventional luminaire using the light guide plate unit in such a form is a transmissive or transflective liquid crystal panel arranged to face the vicinity of the light exit surface by causing the light exit surface of the light guide plate to emit light. The object is to illuminate a transparent document or the like from the back side.

  In the case of the light guide plate unit in such a form, the light is emitted from the light exit surface as the distance from the light source in the light guide plate is increased due to the structure in which the line light source is disposed at the side end of the light guide plate. There is a tendency that light emission decreases and light emission luminance decreases.

  However, when a lighting fixture using this type of light guide plate unit is used for the purpose as described above, it is desirable to emit light with high luminance and uniform luminance distribution over the entire light emitting surface.

  Therefore, for example, a reflection sheet (reflector) that collects light from the light source that travels in a direction other than the incident end face of the light guide plate (side, rear, etc.) to the incident end face is disposed in a predetermined area around the light source. Or a thin-film reflective sheet that reflects the light traveling to the surface (back surface) on the side facing the output surface in the light guide plate toward the output surface is disposed in close contact with the back surface side of the light guide plate, The entire light emitting surface of the light guide plate unit emits light with a high luminance and a uniform luminance distribution, such as by arranging a light diffusion sheet on the surface side of the light guide plate to diffuse the light emitted from the output surface to make uniform surface emission. Various ideas and proposals have been made to make it possible.

  As described above, when a lighting fixture to which a conventional edge light type light guide plate unit is applied is used to illuminate a planar object arranged in the vicinity of the light emitting surface by surface light emission, the light emitting surface is mainly used. Attention has been paid to the luminance distribution, and a device for realizing a high luminance and uniform light emitting surface has been devised.

  On the other hand, in recent years, taking into account the power saving and running cost reduction by lighting fixtures and the effect of reducing carbon dioxide (CO2) emissions, for example, in the display cases of stores, museums, museums, etc. Various lighting devices that use light emitting diodes (LEDs) as light sources with low power consumption and long life have been proposed in lighting fixtures for illuminating a predetermined space such as lighting and indoor lighting. It is being put into practical use.

  However, the conventional fixture as described above, that is, a lighting fixture that uses an edge light type light guide plate unit mainly configured for illumination of a planar object by surface light emission, that is, high brightness and uniformity. When using a lighting device devised to have a simple light emitting surface and performing spatial illumination by surface light emission, there is a possibility that the overall illuminance in the space to be illuminated may be insufficient.

  Therefore, when using a luminaire using an edge light type light guide plate unit and the main application is spatial illumination by surface light emission, the illuminance of a predetermined area in the space rather than the luminance distribution of the light emitting surface. That is, the surface illuminance at a position spaced a predetermined distance from the light source is regarded as important.

  For example, when this type of lighting fixture is used as a ceiling lamp, it is only necessary to mainly illuminate a predetermined area including a substantially central portion of the floor surface. Does not require much consideration.

  In addition, when a light emitting diode is applied as a light source of a lighting fixture, the light emitting diode itself has a long lifetime as an element. On the other hand, for example, the transparent resin member that covers the light emitting portion deteriorates. Therefore, it is conceivable that the illuminance as a lighting fixture is reduced.

  In such a case, there is a problem that a large-scale and complicated replacement operation such as replacement of the light source substrate itself is required, and a device that can realize a simple maintenance operation is desired.

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a predetermined area in a space when performing spatial illumination by surface light emission using an edge light type light guide plate unit. Provided is a light guide plate unit that can realize light distribution suitable for a space to be illuminated in consideration of illuminance, and has excellent maintainability such as replacement of a light source substrate, and a lighting fixture using the light guide plate unit. It is.

  In order to achieve the above object, a light guide plate unit according to a first aspect of the present invention includes a light source unit that forms a line light source in which a plurality of point light sources are arranged in a substantially straight line, and light from the light source unit. Is an incident end face on which is incident, an exit face from which the light incident from the incident end face exits, a reflecting face disposed opposite to the exit face to form a light scattering pattern, And the light scattering pattern of the light guide plate is formed such that a substantially central portion region of the exit surface is denser than a peripheral portion region of the exit surface. It is characterized by that.

  A lighting fixture according to a second aspect of the present invention includes the light guide plate unit and an exterior housing that houses the light guide plate unit therein.

FIG. 1 is a perspective view illustrating an appearance of a lighting fixture using a light guide plate unit according to a first embodiment of the present invention. FIG. 2 is an enlarged vertical cross-sectional view of a main part showing the internal configuration of the lighting apparatus of FIG. 1. FIG. 3 is a side view showing an example of a formation pattern of reflection dots of a light guide plate in a light guide plate unit applied to the lighting apparatus of FIG. 1. FIG. 4 is a plan view showing an example of a light emission pattern of a light emitting surface of the lighting fixture of FIG. 1. FIG. 5 is a side view showing an example of a formation pattern of reflection dots of a light guide plate in a modification of the light guide plate unit applied to the lighting apparatus of FIG. 1. 6 is an enlarged perspective view of a main part showing an example of a support and fixing configuration of a light source unit of a light guide plate unit applied to the lighting fixture of FIG. 1. FIG. 7 is an enlarged perspective view of a main part showing an example of a connection configuration of a light source unit of a light guide plate unit applied to the lighting fixture of FIG. 1. FIG. 8 is an enlarged perspective view of a main part showing another example of the support and fixing configuration of the light source unit of the light guide plate unit applied to the lighting apparatus of FIG. 1. FIG. 9 is a schematic diagram illustrating a configuration example of a large-sized lighting fixture configured by using a plurality of the lighting fixtures of FIG. 1. FIG. 10 is a plan view of a light emitting surface of the large luminaire of FIG. 9. 11 is an enlarged perspective view of a main part showing a connection configuration of light source units in a light guide plate unit applied to each lighting fixture constituting the large lighting fixture of FIG.

  The present invention will be described below with reference to the illustrated embodiments.

  1, FIG. 2 and FIG. 3 are views showing a lighting fixture using a light guide plate unit according to an embodiment of the present invention. Among these, FIG. 1 is a perspective view mainly showing the light emitting surface side of the appearance of the lighting fixture. FIG. 2 is an enlarged vertical cross-sectional view of a main part showing the internal configuration of the lighting fixture. FIG. 3 is a side view showing an example of the formation pattern of the reflective dots of the light guide plate in the light guide plate unit applied to the lighting fixture. FIG. 4 is a plan view showing an example of a light emission pattern of a light emitting surface of the lighting fixture of FIG. FIG. 5 is a view showing a modification of the light guide plate unit of the present embodiment.

  FIG. 6 is an enlarged perspective view of a main part showing an example of a support and fixing configuration of the light source unit in the light guide plate unit of the present embodiment. In FIG. 6, other members are not shown in order to show the relationship between the support 15 and the light source unit 14. FIG. 7 is an essential part enlarged perspective view showing an example of the connection configuration of the light source units in the light guide plate unit of the present embodiment. Also in FIG. 7, in order to avoid complication of the drawing, illustration of members unnecessary for explanation is omitted, and illustration of the support 15 is simplified and indicated by an imaginary line (two-dot chain line). FIG. 8 is an enlarged perspective view of a main part showing another example of the support and fixing configuration of the light source unit in the light guide plate unit of the present embodiment.

  First, as shown in FIGS. 1 and 2, a lighting fixture 1 includes an outer casing 11 having a flat box shape, and a light guide plate unit 10 fixedly held in a form housed in the outer casing 11. It is comprised by.

  The exterior casing 11 is formed with an opening 11a in one box-shaped flat portion, and light formed by using a thin plate member such as milky white acrylic resin in the opening 11a. The diffusion plate 12 is fixedly held. The light diffusing plate 12 is provided for diffusing light emitted from the light guide plate unit 10 (detailed configuration will be described later) to emit surface light.

  In the present embodiment, the outer casing 11 is exemplified as a flat box shape, but the outer shape is not limited to this, and the light guide plate unit 10 is accommodated therein. If it is a form to obtain, the thing of various shapes which considered the design property can be considered.

  Moreover, although the example which provided the light diffusing plate 12 is shown in this embodiment, it is not restricted to this form, For example, it is good also as a form which abbreviate | omitted the light diffusing plate 12, or the light diffusing plate 12 concerned. Alternatively, for example, a simple transparent plate or the like may be provided, or a light control sheet such as a prism sheet may be provided, which is applied to lighting devices that have been widely used in the past. Various types of forms can be applied as they are.

  As shown in FIG. 2, the light guide plate unit 10 receives a light source unit 14 that constitutes a linear light source, a support 15 that fixes and holds the light source unit 14, and light from the light source unit 14 and enters the incident direction. A light guide plate 16 that emits light on a surface orthogonal to the light guide plate, a reflection sheet 17 that is adhered to and adhered to the back surface of the light guide plate 16, and a frame that fixes and holds the light guide plate 16 and the light source unit 14. 13 and a reflector 18 disposed between the frame 13 and the light guide plate 16 to prevent light leakage from the light source unit 14 and the like.

  The light source unit 14 includes a plurality of light emitting diodes (LEDs) 14a and a long LED substrate 14b in which the plurality of light emitting diodes 14a are mounted and arranged in a substantially straight line, for example. The light source unit 14 is disposed in the vicinity of at least one side end surface of the light guide plate 16. In this case, the light emitting diode 14 a of the light source unit 14 is disposed to face the side end surface of the light guide plate 16. Thereby, the light emitted from the light source unit 14 enters the inside of the light guide plate 16. At this time, the side end face of the light guide plate 16 on which light from the light source unit 14 enters is referred to as an incident end face.

  The light source unit 14 is fixedly held by a support 15. For this purpose, as shown in FIG. 6, the support 15 is formed in a form surrounding the LED substrate 14b, and emits at least light from a plurality of light emitting diodes 14a arranged in parallel on the LED substrate 14b. The portion has a groove portion 15a exposed to the outside, and is formed in a long shape substantially the same length as the LED substrate 14b.

  Accordingly, the light source unit 14 can be inserted into and removed from the support 15 by sliding in the direction along the symbol X shown in FIG. At this time, the support 15 has a function of guiding the insertion / extraction operation of the light source unit 14, that is, the sliding in the arrow X direction.

  The light guide plate 16 is a member having, for example, a flat plate shape formed with a predetermined thickness using, for example, a transparent thermoplastic resin. As such a thermoplastic resin, it is desirable to apply an acrylic resin from the viewpoint of moldability when attaching a reflective dot, which will be described later, and the lifetime of LED light. In this light guide plate 16, light from the light source unit 14 incident from the incident end surface is scattered on one flat portion (rear surface) of the planes substantially orthogonal to the incident end surface, and other light guide plates 16 are provided. Reflective dots a (not shown in FIGS. 1 and 2; see FIG. 3), which are light scattering patterns for reflection toward the flat surface (surface) side, are formed in a predetermined pattern. The surface on which the reflective dots a are formed is referred to as a reflective surface.

  The reflective dot a is, for example, a printing method in which dots are printed with a white ink in a predetermined pattern, a molding method in which irregularities are formed by stamper or injection, an adhesive dot method in which a reflective plate is attached with a dot-like adhesive, and the like. It is formed on the back surface of the light guide plate 16. The reflective dots a are formed so as to spread over substantially the entire area of the back surface of the light guide plate 16.

  The reflection sheet 17 is adhered to the outer peripheral edge of the light guide plate 16 by using an adhesive means such as a double-sided tape so as to be in close contact with the back surface of the light guide plate 16.

  As a result, the light from the light source unit 14 incident from the incident end face of the light guide plate 16 is both reflected light reflected by the reflection sheet 17 and scattered light that is irregularly reflected by the reflection dots a on the reflection surface. The light is emitted toward the outside from the other flat surface (surface) facing the 16 reflecting surfaces. Here, a surface from which light is emitted from the light guide plate 16 is referred to as an emission surface.

  The external shape of the light guide plate 16 is a flat plate shape in the above-described example, but is not limited to this shape. For example, as a form such as a curved shape in which a plate-like member is formed in an arc shape, etc. In addition, various forms in consideration of design properties can be applied.

  The frame 13 is formed, for example, by bending a metal plate-like member such as an aluminum material, and has a flat box shape with one opening, and includes a flat portion 13a and a peripheral portion of the flat portion 13a. The upright portion 13a is formed so as to be bent and form a plane substantially orthogonal to the flat portion 13a.

  A light guide plate 16 is fixedly disposed on the flat plate portion 13a. In this case, the light guide plate 16 is fixed so that the reflection surface side is in close contact with the flat surface of the flat plate portion 13a with the reflection sheet 17 interposed therebetween. And between a reflective surface (reflective sheet 17) and the flat plate part 13b, it sticks using adhesive means, such as a double-sided tape, for example in an outer periphery part, or it is a contact | adherence state using fixing means, such as screwing It is said.

  As described above, since the light guide plate 16 is fixedly disposed in contact with the flat plate portion 13b, heat generated from the light source unit 14 or the like is radiated through the flat plate portion 13b made of a metal member, for example. At the same time, the resin-made light guide plate 16 suppresses deformation such as warpage caused by the influence of the surrounding environment such as temperature and humidity.

  In the above-described example, the entire frame body 13 is shown to be formed of a metal member. However, the present invention is not limited to this, and the frame body 13 acts as a heat radiating unit and a light guide plate deformation preventing unit. As another configuration, for example, the region where the light guide plate 16 is disposed, that is, at least the flat plate portion 13b may be configured by a metal member, and the other portion, that is, the standing portion 13a may be configured by a resin member or the like. .

  In the above-described example, the reflection sheet 17 is provided. However, as another configuration, for example, the light can be reflected on the inner surface side of the flat portion 13b, that is, the surface close to the light guide plate 16. You may comprise so that surface finishing (mirror surface treatment etc.) may be given and this may function as a reflective surface instead of the reflective sheet 17. FIG. By adopting such a configuration, an equivalent reflection surface can be formed while omitting the reflection sheet 17.

  Furthermore, in the above-described example, the flat light guide plate 16 has a flat plate portion 13b. However, as described above, the light guide plate 16 has a shape other than the flat plate shape (for example, a curved shape). In correspondence with this, the shape of the flat plate portion 13b may be a shape that can be in close contact with one surface of the light guide plate 16.

  The area of the flat plate portion 13 b is set so as to be slightly larger than the flat portion of the light guide plate 16. The light guide plate 16 is fixedly disposed at a substantially central portion of the flat plate portion 13b. Therefore, a gap space having a predetermined interval is formed between the side end face of the light guide plate 16 fixedly disposed on the flat plate portion 13b of the frame body 13 and the standing portion 13a. And the support body 15 which fixedly held the light source unit 14 is being fixed to the at least 1 inner wall surface of the standing part 13a. That is, the light source unit 14 is disposed in a gap space between the one end face of the light guide plate 16 and the upright portion 13a. In this case, the light emitting portion of the light emitting diode 14 a of the light source unit 14 is disposed so as to face the side end face of the light guide plate 16.

  Focusing on the distance between the light emitting diode 14 and the light guide plate 16, if the distance is too close, the light guide plate tip and side may be exposed when the light guide plate 16 itself is extended due to a change in temperature or the like. There is a possibility of contact with the end face. On the other hand, if the distance is too large, a part of the light from the light emitting part may leak without entering the side end face (incident surface). Therefore, considering these factors, it is desirable to set the distance between the light emitting portion tip of the light emitting diode 14 and the side end face of the light guide plate 16 to about 1 mm (millimeter), for example.

  As described above, the upright portion 13a of the frame body 13 is provided with the light source unit 14 fixedly supported on the support 15 on the inner wall surface thereof, and at a position facing the light emitting portion of the light emitting diode 14a of the light source unit 14. The side end face of the light guide plate 16 is arranged.

  In this case, the light source unit 14 may be disposed between at least one standing portion 13a and the side end surface of the light guide plate 16, but is not limited to this configuration. For example, the light source unit 14 may be disposed in the vicinity of two opposing side end surfaces of the light guide plate 16, or the light source unit 14 may be disposed in the vicinity of the four side end surfaces, and the side edges of the light guide plate 16. You may arrange | position so that a part may be surrounded.

  As described above, the support 15 is fixed to the inner wall surface of the standing portion 13 a of the frame 13, and the light source unit 14 can be inserted into and removed from the support 15. It is like that. For this purpose, the upright portions 13a are formed to be slightly shorter than the corresponding sides of the flat plate portion 13b, whereby cutout portions are formed at the four corners of the frame body 13 (not shown). (Omitted). That is, the light source unit 14 can be inserted into and removed from the support 15 through the notch, and therefore the light source unit 14 can be removed and attached at any time as desired. ing.

  When the light source unit 14 is slid and inserted into the support 15 fixed to the upright portion 13a, the light source unit 14 is provided on the side of the frame 13 when the insertion operation is completed. And is electrically connected.

  That is, as shown in FIG. 7, a convex connection terminal portion 14c protruding in the axial direction is formed at one end portion of the LED substrate 14b of the light source unit 14. Correspondingly, a predetermined portion on the upright piece 13a side facing the connection terminal portion 14c of the LED substrate 14b in the light source unit 14 fixedly held on the support body 15 is disposed on the frame body 13 side. A concave connected terminal portion 13c of an electrical component unit (not shown) is formed.

  Accordingly, the light source unit 14 is inserted into the support 15 while sliding in the direction of the arrow X1 shown in FIG. 7, and when the insertion is completed, the connection terminal portion 14c and the connected terminal portion 13c are fitted. It comes to match. That is, by fitting both the terminals 14c and 13c, the electrical connection between the light source unit 14 (the LED board 14b) and the frame 13 (the electrical component unit) can be easily ensured with one touch. It has become.

  In addition, in the above-mentioned example, although the support body 15 is comprised as a single member, it does not restrict to this form. For example, as shown in the modified example of FIG. 8, a pair of angle-shaped supports in the form of holding the LED board 14b and having the groove 15a that exposes the light emitting part of the light emitting diode 14a to the outside. By forming 15A integrally on the inner wall surface of the upright piece 13a of the frame 13, the above-described support 15 can be replaced. Even in this configuration, the number of members can be reduced while maintaining the same function as that of the support 15 described above.

  Further, in a state where the light source unit 14 is disposed in the gap space between the upright portion 13 a and the light guide plate 16, it is on the opening side of the frame body 13, one end of the support body 15 (light source unit 14), and the light guide plate 16. A reflector 18 is disposed so as to be bridged between the outer peripheral edge portion. The reflecting plate 18 is formed of, for example, a long flat plate member, and at least a surface facing the light source unit 14 is subjected to a surface treatment that can reflect light from the light source unit 14. Has been.

  Therefore, by arranging the reflection plate 18 so as to cover the gap, the reflection plate 18 does not enter the light incident end face of the light guide plate 16 among the light emitted from the light source unit 14 and the light source unit 14 and the light guide plate. The light leaking to the outside through the gap between 16 and stray light reflected by the light incident end face is prevented from leaking to the outside, and at the same time, a part of these is reflected toward the light incident end face, It functions so as to enter the light guide plate 16. Thereby, the light emitted from the optical unit 14 can be made to enter the light guide plate 16 more efficiently.

  By the way, it is well known that the amount of light to the exit surface can be controlled by the pattern of the reflective dots a formed on the back surface of the light guide plate 16.

  In the light guide plate 16, since the brightness tends to decrease as the position is farther from the light source, the reflective dots a are formed such that the area decreases as the distance from the light source decreases, and the area increases as the distance from the light source increases. Thus, the luminance distribution on the exit surface of the light guide plate 16 can be controlled.

  As the pattern of the reflective dots of the light guide plate 16 in the light guide plate unit 10 of the present embodiment, for example, forms as shown in FIGS.

  Note that the example shown in FIG. 3 is an example in which the light source unit 14 is configured. Further, the example shown in FIG. 5 is an example in which two light source units 14 are arranged on opposite side end surfaces.

First, in the case of the configuration example shown in FIG. 3, there is one light source unit 14, and light enters from one side end face. Therefore, the reflective dots formed on the light guide plate 16 have an area according to the distance from the light source. The setting is changed. In this case, as indicated by reference signs a1 to a6 shown in FIG.
a1 <a2 <a3 <a4 <a5 <a6
It is set so that

  In this case, the area of the reflective dots formed on the back surface of the light guide plate 16 is formed over substantially the entire area. As a planar pattern, the light guide plate 16 is indicated by reference numeral 16b in FIG. The pattern is set so that the area of the substantially central portion of the back surface of the back surface is a slightly dense pattern as compared with the peripheral partial area 16c.

In the case of the configuration example shown in FIG. 5, there are two light source units 14, and light is incident from the opposite side end surfaces, so that the reflective dots formed on the light guide plate 16 are similarly light sources and light sources. The area is changed based on the distance. In this case, as indicated by reference signs a1 to a7 shown in FIG.
(A1 = a7) <(a2 = a6) <(a3 = a5) <a4
It is set so that

  Also in this case, the planar pattern of the reflective dots formed on the back surface of the light guide plate 16 is similarly set to be the pattern shown in FIG.

  In addition, the pattern of the reflective dot formed in the light-guide plate 16 is not restricted to this, The appropriate pattern according to the environment at the time of using the said lighting fixture 1 should just be set suitably.

  As described above, according to the above-described embodiment, when spatial illumination is performed by the luminaire 1 using the light guide plate unit 10, the reflection dots of the light guide plate 16 are considered in consideration of the illuminance in the space to be illuminated. By forming a pattern, for example, a pattern in which the region of the substantially central portion of the reflection surface (planar portion) of the light guide plate 16 is dense, light distribution suitable for the space to be illuminated can be easily realized. .

  In addition, the light source unit 14 is configured to be fixedly held by the support 15, and at the same time, the light source unit 14 can be inserted and removed by sliding the light source unit 14 with respect to the support 15, and the light source unit 14 (the LED substrate 14 b of the light source unit 14). Since the electrical connection with the frame 13 (the electrical component unit thereof) can be easily secured with a single touch, the work for replacing the light source unit 14 can be easily performed, and thus maintenance can be performed. It can contribute to improvement.

  And since at least the plane part 13b of the frame 13 which accommodates the light-guide plate unit 10 is comprised by metal members, such as an aluminum material, and it comprised so that the back surface of the light-guide plate 16 might be closely_contact | adhered and fixed to this, a light-guide plate is thereby obtained. The deformation of 16 can be suppressed, and at the same time, the heat generated by the light source unit 14 and the like can be dissipated.

  By the way, although the lighting fixture which performs space illumination of the thing of various external sizes is desired, it is not efficient to prepare the lighting fixture as a product for every various sizes.

  However, if the light guide plate unit 10 of the present invention is used, a large luminaire can be easily configured.

  The example in the case of comprising a larger illuminating device using the light-guide plate unit 10 of the said one Embodiment is demonstrated below using FIGS. 9-11.

  9 and 10 are schematic views illustrating a configuration example of a large-sized lighting fixture configured by using a plurality of light guide plate units according to an embodiment of the present invention. In addition, FIG. 10 is a top view which shows the light emission surface of the said large illuminating device. FIG. 11 is an enlarged perspective view of a main part showing a connection configuration of the light source units in the light guide plate unit.

  As shown in FIG. 9 and FIG. 10, the large luminaire 1B is fixed and held in an external housing 11B having a flat box shape and housed inside the external housing 11B. It is comprised by the some light-guide plate unit 10B which consists of the structure similar to a form.

  The light guide plate unit 10B used in the large luminaire 1B has a light emitting surface that has a vertically long rectangular shape, and the light source units 14B are arranged opposite to each other on both side end surfaces on the long side.

  The outer casing 11B has a box shape, and a light diffusion plate 12B (or a light control sheet such as a prism sheet instead) may be fixedly held in an opening formed in one flat portion. And as shown in FIG. 9, the other plane part of the exterior housing | casing 11B is installed in fixed parts 100, such as a wall surface and a ceiling, for example.

  In the exterior casing 11B, a plurality of light guide plate units 10B each having an independent form are arranged side by side.

  In this case, the gap distance between the light emitting surface (outgoing surface) of each light guide plate unit 10B and the light diffusing plate 12B is set to, for example, the code D = about 15 to 20 mm (millimeter) shown in FIG. . This distance D is appropriately set in consideration of the application and the like in order to efficiently perform surface light emission by the lighting fixture 1.

  In other words, in the large luminaire 1B shown in the above-described example, a plurality of independent light guide plate units 10B are arranged side by side in one large exterior casing 11B, so that adjacent light guide plate units are arranged. A gap portion between 10B, that is, a portion where each light source unit 14B is arranged becomes a dark portion without emitting light. For this reason, if the light emitting surface of the light guide plate unit 10B and the light diffusion surface 12B are close to each other, a linear shadow may be generated on the light diffusion surface 12B.

  Therefore, the light diffusing surface 12B is moved to the distance where the light emitted from each of the peripheral portions of the adjacent light guide plate units 10B intersects with each other, that is, the distance where the light emitted from the adjacent light guide units 10B overlaps. If they are separated from each other, the entire light diffusion surface 12B can be surface-emitted without causing the above-described shadow to occur on the light-emitting surface.

  In consideration of such points, the distance D between the light emitting surface (outgoing surface) of each light guide plate unit 10B and the light diffusion plate 12B is appropriately set.

  As described above, in the large luminaire 1B, the light source unit 14B of each light guide plate unit 10B is arranged on the long side. In this case, it is not efficient to prepare the length size of the LED substrate itself constituting the light source unit 14B for each size of the lighting fixture. In addition, a long LED substrate when a plurality of light emitting diodes are mounted and arranged in a substantially straight line is usually set to a length of, for example, about 300 to 600 mm (millimeters). Those longer than this are not usually used. And when the LED board of a size longer than usual is desired, connecting the connection line between two board | substrates and using is performed. In this case, troublesome work such as soldering is required, and it takes a lot of man-hours and time for manufacturing, which has a problem of affecting the total cost. Therefore, in consideration of these circumstances, the light source unit 14B of this example is configured.

  That is, the light source unit 14B used in the lighting apparatus 1B of the present example configures a light source unit 14B having a desired length by connecting a plurality of two types of light source units (14, 14A) as shown in FIG. The joint method is used.

  That is, the kind of light source unit 14 constituting the light source unit 14B has the same configuration as that described in the above-described embodiment (see FIG. 7), and has a protruding connection terminal portion at one end. 14c.

  Further, another type of light source unit 14A constituting the light source unit 14B has a concave connected terminal portion 14Ac at one end portion of the LED substrate 14Ab, and although not shown, the light source unit 14A is disposed at the other end portion. 14 has a convex connection terminal portion 14c similar to FIG.

  Then, the connecting terminal portion 14c and the connected terminal portion 14ac are fitted to each other in the direction indicated by the arrow X in FIG. 11, so that both the light source units 14 and 14A (the LED substrates 14b and 14Ab) are electrically connected to each other. Connected.

  In such a configuration, as described above, two types of light source units 14 and 14A having general length dimensions are prepared without preparing a large number of light source units of a plurality of types having different length sizes. The light source unit 14B having a desired length can be formed simply by appropriately connecting the connection terminal portion and the connected terminal portion.

  In addition, there is no need to prepare parts for each lighting device of various sizes, and the unit can be shared, so that the types of parts can be reduced and efficient parts management can be performed. it can.

  In addition, since a plurality of light source units are connected, it is economical because it is only necessary to replace the defective light source unit when it is necessary to repair or replace the light source unit. This can contribute to the reduction of.

  Then, a plurality of independent light guide plate units 10B are arranged side by side and are set so as to cover the entire light emitting surfaces of the respective light guide units 10B and in consideration of the overlap regions of the adjacent light guide units 10B. Since the large light diffusing plate 12B is arranged (position separated from the light emitting surface by a predetermined distance D), the entire light diffusing surface 12B is surface-emitting without causing a shadow or the like on the light diffusing plate 12B. Can be made.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and applications can of course be implemented without departing from the spirit of the invention. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the effect of the invention Can be obtained as an invention.

Claims (11)

A light source unit that forms a line light source formed by arranging a plurality of point light sources in a substantially straight line; and
An incident end face on which light from the light source unit is incident, a plane that is substantially orthogonal to the incident end face and that emits light incident from the incident end face, and is disposed so as to face the exit plane. A light guide plate having at least a reflective surface formed with
Comprising
The light guide plate unit, wherein the light scattering pattern of the light guide plate is formed so that a substantially central partial region of the light exit surface is denser than a peripheral partial region of the light exit surface.   A flat portion made of a metal member and arranged in close contact with the reflecting surface of the light guide plate and an upright portion having a surface substantially perpendicular to the flat portion and where the light source unit is disposed are integrally formed. The light guide plate unit according to claim 1, further comprising a frame body having a box shape. Further comprising a support for slidingly holding the light source unit so that it can be inserted and removed;
The light guide plate unit according to claim 1, wherein the support is fixed to the upright portion of the frame. The light source unit includes a plurality of light emitting diodes and a long electric substrate on which the plurality of light emitting diodes are mounted.
The light guide plate unit according to claim 1, wherein the electric board has a connection terminal portion at one end.   The light guide plate unit according to claim 4, wherein the electric board further includes a connected terminal portion at the other end.   2. The light guide plate unit according to claim 1, further comprising a reflection plate that covers a gap between the support and an outer edge portion of the light guide plate on an opening side of the frame body.   The light guide plate unit according to any one of claims 1 to 6, wherein the light guide plate is made of an acrylic resin. The light guide plate unit according to any one of claims 1 to 6,
An exterior housing that houses the light guide plate unit therein;
A lighting fixture comprising:   The lighting apparatus according to claim 8, further comprising a light diffusing plate disposed at a position facing the light exit surface of the light guide plate in the light guide plate unit.   The lighting apparatus according to claim 8, wherein a light control sheet is disposed at a position facing the light exit surface of the light guide plate in the light guide plate unit. The gap D between the exit surface of the light guide plate and the light diffusion plate is
15 mm (millimeter) ≦ D
The luminaire according to claim 9, wherein

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