JP2015173009A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire which can restrain a luminance difference from being increased even when a structure is installed in a clearance which is formed between a plurality of surface light-emitting elements.SOLUTION: A luminaire 100 comprises: a plurality of surface light-emitting elements 10 which are arrayed in a matrix; a holding member which holds a plurality of the surface light-emitting elements 10; an optical member 30 arranged so as to face a plurality of the surface light-emitting elements 10; and a support member 40 which is arranged on the holding member, and supports the optical member 30. The surface light-emitting elements 10 further include light emitting parts R1 and non-light emitting parts R2. A first region R3 is formed between the light emitting parts R1 adjacent to each other and a second region R4 is formed between the surface light-emitting elements 10 adjacent to each other, in a first direction in which the surface light-emitting elements 10 adjacent to each other are arrayed. The support member 40 is arranged at a region R5 in which the first region R3 and the second region R4 are superposed on each other when viewed from a normal line direction of surfaces of the surface light emitting-elements 10.

Description

  The present invention relates to a lighting device, and more particularly to a lighting device including a plurality of planar light emitting elements arranged in a matrix.

  In recent years, various lighting devices using planar light emitting elements using organic EL (Organic Electroluminescence) have been proposed. When it is going to enlarge this illuminating device, a some planar light emitting element will be arranged in a matrix form.

  As a document disclosing an illuminating device formed by arranging a plurality of planar light emitting elements in a matrix, for example, Japanese Unexamined Patent Application Publication No. 2010-113954 (Patent Document 1) is cited.

  The illumination device disclosed in Patent Document 1 includes a plurality of planar light emitting elements arranged in a matrix at predetermined intervals, and an optical device having light diffusibility at a predetermined distance from a light emitting portion of the planar light emitting elements. A member, and a plurality of support members that support the optical member and the plurality of planar light emitting elements.

  A lattice-like gap is formed between the plurality of planar light emitting elements. Each of the plurality of support members is provided in a region of the lattice-shaped gap where a portion extending in the row direction and a portion extending in the column direction intersect. The plurality of planar light emitting elements are supported by the support member by the back surfaces of the protrusions provided on the front end side of the support member coming into contact with the surfaces of the corners of the planar light emitting elements arranged so as to be close to each other. The The optical member is supported by the tip of the support member.

JP 2010-113954 A

  In the case where a plurality of planar light emitting elements are arranged in a matrix, the luminance decreases in the gap between adjacent planar light emitting elements. In the lattice-shaped gap, a region where a portion extending in the row direction and a portion extending in the column direction intersect is located at a location away from the light emitting portion of each planar light emitting element. For this reason, the area has less wraparound of the light emitted from the light emitting unit, and has the lowest luminance in the illumination device.

  When a support member is disposed in the region as in the illumination device disclosed in Patent Document 1, light that has entered from the light emitting unit is scattered by the support member, and the luminance further decreases in the region. There is a concern that the luminance unevenness deteriorates as the luminance difference further expands in the lighting device.

  The present invention has been made in view of the above problems, and the object of the present invention is to provide luminance even when a structure is installed in a gap formed between a plurality of planar light emitting elements. It is providing the illuminating device which can suppress that a difference expands.

  The illumination device according to the present invention includes a plurality of planar light emitting elements each including a front surface and a back surface and arranged in a matrix, and a holding for holding the plurality of planar light emitting elements from the back surface side of the planar light emitting element. A member, an optical member arranged to be opposed to the plurality of planar light emitting elements from the surface side of the planar light emitting element with an interval from the plurality of planar light emitting elements, and on the holding member And a support member that supports the optical member. The planar light emitting element further includes a light emitting part that emits light from the surface side and a non-light emitting part located on an outer periphery of the light emitting part. In a first direction in which the planar light emitting elements adjacent to each other are arranged, a first region is formed between the light emitting portions adjacent to each other, and a second region is formed between the planar light emitting elements adjacent to each other. The support member is provided in a third region where the first region and the second region overlap when viewed from the normal direction of the surface of the planar light emitting element.

  In the lighting device according to the present invention, the planar light emitting element and the light emitting portion preferably have a rectangular shape when viewed from the normal direction of the surface of the planar light emitting element.

  In the illumination device according to the present invention, when viewed from the normal direction of the surface of the planar light emitting element, the third region may include a fourth region having a rectangular shape with the same center. preferable. In this case, the length of the fourth region along the first direction is preferably half the interval between the planar light emitting elements adjacent to each other in the first direction. It is preferable that the length of the fourth region along the orthogonal second direction is half of the length of the light emitting unit along the second direction. Furthermore, it is preferable that the support member is provided in the fourth region.

  In the illuminating device based on the said invention, it is preferable that the surface of the said supporting member facing the space formed between the said optical member and the said holding member has light diffusivity.

  In the lighting device according to the present invention, it is preferable that at least a portion of the support member located between the optical member and the holding member has light transmittance.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where a structure is installed in the clearance gap formed between several planar light emitting elements, the illuminating device which can suppress a brightness difference expanding can be provided.

It is a top view which shows the planar light emitting element with which the illuminating device which concerns on Embodiment 1 of this invention is comprised. It is sectional drawing along the II-II line | wire shown in FIG. It is sectional drawing which shows the illuminating device which concerns on Embodiment 1 of this invention. It is a top view of the illuminating device shown in FIG. It is a figure which shows the installation position of the supporting member with which an illuminating device is equipped. It is a figure which shows the luminance distribution along the DD line | wire shown in FIG. 5 at the time of installing a supporting member in A point shown in FIG. It is a figure which shows the luminance distribution along the DD line | wire shown in FIG. 5 at the time of installing a supporting member in the B point shown in FIG. It is a figure which shows the luminance distribution along the DD line | wire shown in FIG. 5 at the time of installing a supporting member in C point shown in FIG. It is a figure which shows the luminance distribution along the DD line | wire shown in FIG. 5 when a support member is installed in the A point shown in FIG. 5 in the illuminating device which concerns on a modification. It is a top view which shows the illuminating device which concerns on Embodiment 2 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the same or common parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated. Further, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified.

(Embodiment 1)
(Surface emitting element)
FIG. 1 is a plan view showing a planar light emitting element included in the lighting apparatus according to the present embodiment. FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. With reference to FIG. 1 and FIG. 2, the planar light emitting element 10 provided in the lighting apparatus according to the present embodiment will be described.

  As shown in FIGS. 1 and 2, the planar light emitting element 10 is composed of, for example, an organic EL element. The planar light emitting device 10 includes a transparent substrate 12, an anode 13, an organic layer 14, a cathode 15, a sealing layer 16, and an insulating layer 17. The planar light emitting element 10 includes a front surface 10a and a back surface 10b. The surface 10a of the planar light emitting element 10a corresponds to the main surface of the transparent substrate 12 opposite to the organic layer 14. The back surface 10 b of the planar light emitting element 10 corresponds to the main surface of the sealing layer 16 opposite to the cathode 15.

  The transparent substrate 12 is composed of various glass substrates, for example. As a member constituting the transparent substrate 12, a film substrate such as PET or PC may be used. On the surface of the transparent substrate 12, an anode 13, an organic layer 14, and a cathode 15 are sequentially laminated.

  The anode 13 is a conductive film having transparency. In order to form the anode 13, ITO (Indium Tin Oxide) or the like is formed on the transparent substrate 12 by sputtering or the like. The anode 13 is formed by patterning the ITO film into a predetermined shape by photolithography or the like. The anode 13 in the present embodiment is divided into two regions by patterning in order to form an electrode portion 18 (for anode) and an electrode portion 19 (for cathode).

  The organic layer 14 (light emitting unit) can generate light (visible light) by being supplied with electric power. The organic layer 14 may be composed of a single light emitting layer, or may be composed of a hole transport layer, a light emitting layer, a hole blocking layer, an electron transport layer, and the like that are sequentially laminated.

  The cathode 15 is aluminum (AL), for example. The cathode 15 is formed so as to cover the organic layer 14 by a vacuum deposition method or the like. In order to pattern the cathode 15 into a predetermined shape, a mask may be used during vacuum deposition.

  An insulating layer 17 is provided between the cathode 15 and the anode 13 on the electrode part 18 side so that the cathode 15 and the anode 13 are not short-circuited. The part of the cathode 15 opposite to the side on which the insulating layer 17 is provided is connected to the anode 13 on the electrode part 19 side. The insulating layer 17 is formed in a desired pattern so as to cover a portion that insulates the anode 13 and the cathode 15 from each other using a photolithography method or the like after, for example, a SiO 2 film is formed using a sputtering method.

  The sealing layer 16 is made of an insulating resin or a glass substrate. The sealing layer 16 is formed to protect the organic layer 14 from moisture and the like. The sealing layer 16 seals substantially the entire anode 13, organic layer 14, and cathode 15 on the transparent substrate 12. A part of the anode 13 is exposed from the sealing layer 16 for electrical connection.

  The portion of the anode 13 exposed from the sealing layer 16 (on the left side in FIG. 4) constitutes an electrode portion 18. The electrode part 18 and the anode 13 are made of the same material. The electrode portion 18 is located on the outer peripheral portion of the planar light emitting element 10. The portion of the anode 13 exposed from the sealing layer 16 (on the right side in FIG. 4) constitutes an electrode portion 19. The electrode part 19 and the anode 13 are made of the same material. The electrode portion 19 is also located on the outer peripheral portion of the planar light emitting element 10. The electrode part 18 and the electrode part 19 are located on the opposite sides of the organic layer 14. A wiring pattern (not shown) is attached to the electrode portion 18 and the electrode portion 19 using soldering (silver paste) or the like.

  In the planar light emitting element 10 configured as described above, the light emitting portion R1 and the non-light emitting portion R2 are formed. The portion where the light emitting portion R1 is formed is located on the center side of the surface 10a (light emitting surface) and substantially corresponds to the region where the organic layer 14 is formed. The portion where the non-light emitting portion R2 is formed is located on the outer periphery of the light emitting portion R1, and substantially corresponds to the region where the electrode portions 18 and 19 are formed. The light emitting unit R1 emits light from the surface 10a side of the planar light emitting element 10.

  The outer size of the transparent substrate 12 is 100 mm wide × 100 mm deep, and the outer size of the light emitting portion R1 is 90 mm wide (L3 in FIG. 4) × 90 mm deep (L4 in FIG. 4) 90 mm. The widths of the light emitting portions R2 located on both sides of the light emitting portion R1 are 5 mm each.

(Lighting device)
FIG. 3 is a cross-sectional view showing the lighting apparatus according to the present embodiment. FIG. 4 is a plan view of the illumination device shown in FIG. With reference to FIG. 3 and FIG. 4, the illuminating device 100 which concerns on this Embodiment is demonstrated.

  As shown in FIG. 3, the lighting device 100 includes two planar light emitting elements 10, a holding member 20, an optical member 30, and a support member 40. The two planar light emitting elements 10 are arranged in a matrix of 2 rows and 1 column with a predetermined interval L2. The interval L2 is about 15 mm, for example. The two planar light emitting elements 10 are arranged side by side so that the outer circumferences 10E of the transparent substrate 12 face each other. For this reason, a non-light emitting region NLA is formed between the two light emitting portions R1 of the planar light emitting element 10. The width of the non-light emitting area NLA is about 25 mm. For example, the planar light emitting element 10 and the light emitting portion R <b> 1 have a rectangular shape when viewed from the normal direction of the surface 10 a of the planar light emitting element 10.

  The two surface light emitting elements are wired in series with a wiring member (not shown) (silver paste, solder, conductive tape, etc.). By supplying electric power from an external power source (not shown) to both ends of the wiring, the two planar light emitting elements 10 emit light.

  The holding member 20 holds the two planar light emitting elements 10 from the back surface 10 b side of the planar light emitting element 10. As the holding member 20, for example, a transparent resin film such as flexible PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PC (polycarbonate), PMMA (polymethyl methacrylate), or the like can be used.

  The holding member 20 may be configured not to have translucency, and may be configured by a laminated film of a metal film such as aluminum and a resin film, for example. Further, the holding member 20 is not limited to the transparent resin film described above, and may be configured by a metal casing such as AL (aluminum) or SUS (stainless steel) that does not have flexibility.

  The optical member 30 has a sheet shape. The optical member 30 is disposed so as to face the two planar light emitting elements 10 from the surface 10a side of the planar light emitting element 10 with a distance L1 from the two planar light emitting elements 10. The interval L1 is, for example, about 20 mm to 30 mm. The space | interval L1 can be suitably changed according to the thickness of the illuminating device 100 set to a desired value.

  The optical member 30 has a function of reducing a luminance difference caused by the light emitting unit R1 and the non-light emitting region NLA. As the optical member 30, for example, a light diffusing plate having a dot pattern printed on its surface by a printing method or the like can be employed.

  For example, many dot patterns are provided in relatively bright portions such as a portion facing the light emitting portion R1, and few dot patterns are provided in relatively dark portions such as a portion facing the non-light emitting region NLA.

  The light emitted from the light emitting part R <b> 1 of the two planar light emitting elements 10 reaches the optical member 30 and then enters the optical member 30. The light incident on the optical member 30 is diffused in the optical member 30 and is emitted toward the outside. The light is diffused by the optical member 30 while adjusting the amount of light by the dot pattern, thereby reducing the non-uniformity of the brightness and making the non-light emitting area NLA more inconspicuous. Thereby, luminance unevenness can be reduced.

  In addition, as a light diffusing plate, there are those which diffuse light by using internal scattering action by containing fine particles inside, and those which diffuse light by using interface reflection action by having irregularities on the surface, etc. Can be used.

  Further, an optical filter may be separately provided instead of the dot pattern. In this case, the optical filter has a light transmittance distribution in which the transmittance is higher in the region facing the non-light emitting region NLA than in the region facing the light emitting portion R1. An optical filter is affixed on the surface of the optical member 30 located in the planar light emitting element 10 side, for example.

  The support member 40 is provided on the holding member 20 and supports the optical member 30. The support member 40 includes a fixture 41 and a support body 42. The support 42 is fixed on the holding member 20. The support body 42 has, for example, a cylindrical shape with a diameter of 10 mm. Note that the support 42 may have a prismatic shape. As the support body 42 and the fixture 41, for example, a resin material can be employed. It is preferable that the support body 42 and the fixture 41 are transparent and have translucency.

  An insertion hole 43 capable of receiving the distal end of the fixture 41 is provided at the distal end of the support body 42 located on the optical member 30 side. A through hole 31 is provided in the optical member 30 so as to correspond to the insertion hole 43. The insertion hole 43 of the support 42 and the through hole 31 of the optical member 30 are overlapped, and the tip of the fixture 41 is inserted into the insertion hole through the through hole 31. As a result, the optical member 30 is held between the fixture 41 and the support 42.

  As shown in FIG. 4, the support member 40 has a third region R5 in which a first region R3 described later and a second region R4 described later overlap when viewed from the normal direction of the surface 10a of the planar light emitting element 10. Is provided. When installed in the third region R5, it is possible to prevent the luminance difference in the gap between the planar light emitting elements 10 adjacent to each other from expanding as will be described later.

  The first region R3 is formed between the light emitting portions R1 adjacent to each other in the direction in which the planar light emitting elements 10 adjacent to each other are aligned (DR1 direction in FIG. 4). The direction in which the planar light emitting elements 10 adjacent to each other are arranged corresponds to the first region. The first region R3 will be described in more detail. One light emitting portion R1 of the planar light emitting elements 10 adjacent to each other has corner portions Q1, Q2 located on the side closer to the other light emitting portion R1. The other light emitting portion R1 of the planar light emitting elements 10 adjacent to each other has corner portions Q3 and Q4 located on the side closer to the one light emitting portion R1. A region surrounded by the corners Q1, Q2, Q3, Q4, that is, a line connecting the corners Q1 and Q2, a line connecting the corners Q2 and Q4, a line connecting the corners Q4 and Q3, and corners A region surrounded by a line connecting the part Q3 and the corner part Q1 corresponds to the first region R3.

  The second region R4 is formed between the adjacent planar light emitting elements 10 in the direction in which the adjacent planar light emitting elements 10 are arranged (direction DR1 in FIG. 4). The second region R4 will be described in more detail. One of the planar light emitting elements 10 adjacent to each other has corner portions P <b> 1 and P <b> 2 positioned on the side close to the other planar light emitting element 10. The other of the planar light emitting elements 10 adjacent to each other has corner portions P3 and P4 located on the side close to the one planar light emitting element 10. A region surrounded by corners P1, P2, P3, P4, that is, a line connecting corner P1 and corner P2, a line connecting corner P2 and corner P4, a line connecting corner P4 and corner P3, an angle A region surrounded by a line connecting the part P3 and the corner part P1 corresponds to the second region R4.

  The support member 40 is preferably provided in a fourth region R6 indicated by a two-dot chain line in FIG. 4 in the third region R5. The fourth region R <b> 6 has a rectangular shape when viewed from the normal direction of the surface of the planar light emitting element 10. The fourth region R6 is centered on the center O of the third region R5, and the width L6 is the distance L2 between the two planar light emitting elements 10 in the direction in which the adjacent planar light emitting elements 10 are arranged (first direction). The depth L5 is a region that is half the depth L4 of the light emitting portion R1. In the fourth region R6, the width L6 corresponds to the length along the first direction, and the depth L5 corresponds to the length along the second direction orthogonal to the first direction. The center O of the third region coincides with the center of the fourth region. When the support member 40 is installed in the fourth region R6, the luminance difference in the gap between the planar light emitting elements 10 adjacent to each other can be more reliably reduced.

  FIG. 5 is a diagram illustrating an installation position of a support member provided in the lighting device. 6 to 8 are diagrams showing luminance distributions along the line D-D when support members are installed at the points A, B, and C, respectively. With reference to FIG. 5 to FIG. 8, changes in the luminance distribution when the position where the support member 40 is installed are changed from the point A to the point C will be described.

  As shown in FIG. 5, points A, B, and C are provided on the line DD passing through the center O so as to be orthogonal to the direction in which the adjacent planar light emitting elements 10 are arranged. The point A is located at the center O of the third region R5. At point A, the support member 40 is installed so that the center of the support member 40 and the center O of the third region R5 overlap when viewed from the normal direction of the surface 10a of the planar light emitting element 10.

  The point B is located away from the center O in a direction orthogonal to the direction in which the adjacent planar light emitting elements 10 are arranged, and is located outside the fourth region R6 and inside the third region R5. At point B, two support members 40 were installed. One of the two support members 40 is installed such that the outer periphery of the support member 40 is in contact with a line connecting the corner portion Q1 of one light emitting portion R1 and the corner portion Q3 of the other light emitting portion R1. The other of the two support members 40 is installed such that the outer periphery of the support member 40 is in contact with a line connecting the corner portion Q2 of one light emitting portion R1 and the corner portion Q4 of the other light emitting portion R1.

  The point C is located away from the center O in a direction orthogonal to the direction in which the adjacent planar light emitting elements 10 are arranged, and is located outside the third region R5 and within the second region R4. At the point C, two support members 40 are installed.

  6 to 8, the luminance distribution along the line DD when the support member 40 is not installed is indicated by a one-dot chain line, and along the line DD when the support member 40 is installed from the point A to the point C. Each luminance distribution is indicated by a solid line.

  The light emitting portion R1 does not exist in the region where the support member 40 is provided. For this reason, the area in which the support member 40 is provided obtains a light amount by the wraparound of light from the light emitting portion R1. In the region along the line D-D, light wraps around in the central portion near the light emitting portion R1. As the distance from the light emitting portion R1 increases as the distance from the center O increases, the wraparound of light decreases. For this reason, when the support member 40 is not provided, the luminance increases at the center as shown by the alternate long and short dash line in FIGS. 6 to 8, and decreases as the distance from the center O increases. The luminance is lowest outside the third region R5. In the region along the DD line, the intersection S1 between the line connecting the corners Q1 and Q3 and the DD line, the intersection S2 between the line connecting the corners Q2 and Q4 and the DD line, and so on. In the region farther from the center O, the luminance is lowest.

  As shown in FIG. 6, when the support member 40 is installed at the point A, light that circulates from the light emitting portion R <b> 1 is emitted near the center O. For this reason, the brightness | luminance of the center O vicinity falls compared with the case where the supporting member 40 is not installed. Regarding the difference (luminance difference) between the maximum value and the minimum value in the luminance distribution along the line D-D, the luminance difference P1 when the support member 40 is installed at the point A is the luminance when the support member 40 is not installed. It becomes lower than the difference P0.

  As described above, when the support member 40 is installed at the point A, the brightness difference can be reduced in the gap between the adjacent planar light emitting elements 10 as compared with the case where the support member 40 is not installed. Unevenness can be reduced.

  As shown in FIG. 7, when the support member 40 is installed at the point B, light that travels from the light emitting unit R <b> 1 is scattered in a region where the brightness decreases from the center O and the luminance decreases. Specifically, light that wraps around from the light emitting portion R1 is emitted in a region that is inside the intersection S1 and the intersection S2 and close to the intersection S1 and the intersection S2. On the other hand, in the region outside the third region R5 and farther from the center O than the intersections S1 and S2, the light emitted from the light emitting unit R1 wraps around to the same extent as when the support member 40 is not installed. In the central portion, the light emitted from the light emitting portion R1 wraps around to the same extent as when the support member 40 is not installed.

  For this reason, regarding the difference (luminance difference) between the maximum value and the minimum value in the luminance distribution along the line DD, the luminance difference P2 when the support member 40 is installed at the point A does not install the support member 40. In this case, the luminance difference P1 is almost the same. Thereby, it is possible to prevent the luminance difference from increasing in the gap between the adjacent planar light emitting elements 10.

  As shown in FIG. 8, when the support member 40 is installed at the point C, the light emitting unit R1 wraps around in the region outside the third region R5 and farther from the center O than the intersection S1 and the intersection S2. Light is shining. As a result, the luminance is further reduced in the region outside the third region R5 and having the lowest luminance. On the other hand, in the central portion, the light emitted from the light emitting portion R1 wraps around to the same extent as when the support member 40 is not installed.

  For this reason, regarding the difference (luminance difference) between the maximum value and the minimum value in the luminance distribution along the line DD, the luminance difference P3 when the support member 40 is installed at the point A does not install the support member 40. In this case, the luminance difference P1 is larger. Thereby, the brightness difference is enlarged in the gap between the adjacent planar light emitting elements 10.

  Here, when the luminance unevenness is reduced by using the optical member 30, for example, as described in JP 2010-103013 A, the diffusivity is changed in the plane of the optical member 30 according to the luminance difference level. . Further, the above-described dot pattern or optical film is provided on the optical member 30, and the in-plane luminance is corrected so that the luminance of the portion with high luminance is lowered. In either case, correction is made so as to reduce the luminance difference. For this reason, when the luminance difference is large in a state before correction, the luminance difference in the lighting device plane cannot be suppressed within a desired range unless the maximum luminance obtained above the light emitting unit R1 is greatly reduced. . Excessive luminance correction by the optical member 30 causes a decrease in light emission efficiency. Therefore, when the support member 40 is installed between the planar light emitting elements 10 adjacent to each other, it is preferable to minimize the influence on the luminance difference.

  In the present embodiment, the support member 40 is provided in the third region R5. When the support member 40 is thus installed, the luminance difference in the gap between the adjacent planar light emitting elements 10 is equal to or less than the luminance difference when the support member 40 is not installed. For this reason, it is not necessary to correct | amend so that a brightness | luminance may fall excessively compared with the case where the supporting member 40 is not installed. Thereby, it can prevent that the luminous efficiency of the illuminating device 100 falls.

  Further, by installing the support member 40 in the fourth region R6, light that wraps around from the light emitting unit R1 is emitted in a region where the luminance is higher. For this reason, it can prevent more reliably that the brightness | luminance difference in the clearance gap between the adjacent planar light emitting elements 10 expands rather than the brightness | luminance difference in the case where the supporting member 40 is not installed. Thereby, it can prevent more reliably that the luminous efficiency of the illuminating device 100 falls.

  Further, by installing the support member 40 in the vicinity of the center O of the third region R5, the luminance difference in the gap between the adjacent planar light emitting elements 10 is compared with the luminance difference in the case where the support member 40 is not installed, Get smaller. Thereby, the brightness nonuniformity in the clearance gap between the adjacent planar light emitting elements 10 can be reduced, and the brightness nonuniformity in the whole illuminating device can also be reduced.

(Modification)
FIG. 9 is a diagram showing a luminance distribution along the line DD shown in FIG. 5 when a support member is installed at the point A shown in FIG. 5 in the lighting apparatus according to the modification. With reference to FIG. 9, the illuminating device which concerns on a modification is demonstrated.

  In the illumination device according to this modification, the surface of the support member 40 facing the space formed between the optical member 30 and the holding member 20 is light diffusing as compared with the illumination device 100 according to the first embodiment. It differs in that it has sex. Other configurations are almost the same.

  A diffusion paint having light diffusibility is applied to the surface of the support 42. As the diffusion coating, for example, a binder resin obtained by adding light diffusing particles can be used. In addition, the surface of the support body 42 may have light diffusibility by disperse | distributing the particle | grains and powder which have light diffusibility in the support body 42 at the time of support body 42 formation.

  In FIG. 9, the luminance distribution when the support member is not provided is indicated by a one-dot chain line, and the luminance distribution when the support member is provided at the point A in the lighting device according to Embodiment 1 is indicated by a two-dot chain line. In the illuminating device according to, the luminance distribution in the case where the support member is provided at the point A is indicated by a solid line.

  Even in the modification, a part of the light is emitted from the central portion of the support member 40, and therefore the difference between the maximum value and the minimum value (luminance difference P4) in the luminance distribution along the line DD is not provided with the support member 40. It becomes smaller than the brightness difference P1 in the case.

  On the other hand, in this modification, since the surface of the support 42 has light diffusibility, the light that has entered from the light emitting portion R1 is diffused on the surface of the support 42. Thereby, compared with Embodiment 1, the quantity of the light which wraps around the support body 42 increases. For this reason, in this modification, a decrease in luminance at the center is suppressed as compared with the first embodiment. Thereby, the luminance difference P4 in the modification is larger than the luminance difference P1 in the first embodiment.

  In this modification, when considering the luminance difference between the light emitting unit R1 and the non-light emitting region NLA, the luminance difference of the entire lighting device changes in a direction to be smaller than that in the first embodiment. For this reason, in this modified example, in addition to substantially the same effect as in the first embodiment, luminance unevenness is reduced as a whole lighting device.

(Embodiment 2)
FIG. 10 is a plan view showing the lighting apparatus according to the present embodiment. With reference to FIG. 10, lighting apparatus 100A according to the present embodiment will be described.

  As shown in FIG. 10, in the present embodiment, a plurality of planar light emitting elements 10A, 10B, 10C, and 10D are arranged in a matrix of 2 rows and 2 columns at a predetermined interval. The holding member holds the four planar light emitting elements 10A, 10B, 10C, and 10D from the back side of the planar light emitting element. The optical member 30 is opposed to the four planar light emitting elements 10A, 10B, 10C, and 10D from the surface side of the planar light emitting element at an interval L1 with respect to the four planar light emitting elements 10A, 10B, 10C, and 10D. Are arranged as follows. The support members 40A, 40B, 40C, and 40D are provided on the holding member 20 and support the optical member 30.

  As in the first embodiment, the support member 40A, when viewed from the normal direction of the surface of the planar light emitting element, is mutually aligned in the direction in which the adjacent planar light emitting elements 10A and 10B are arranged (DR1 direction in the figure). In the direction in which the first region R3A formed between the adjacent light emitting portions R1 and the planar light emitting elements 10A and 10B adjacent to each other are arranged (the DR1 direction in the drawing), it is formed between the adjacent planar light emitting elements 10. It is provided in the third region R5A overlapping the second region R4A.

  When viewed from the normal direction of the surface of the planar light emitting element, the support member 40B is disposed between the light emitting portions R1 adjacent to each other in the direction in which the planar light emitting elements 10B and 10C adjacent to each other are aligned (the DR2 direction in the drawing). The first region R3B formed overlaps the second region R4B formed between the adjacent planar light emitting elements 10 in the direction in which the adjacent planar light emitting elements 10B and 10C are arranged (DR2 direction in the drawing). Provided in the third region R5B.

  When viewed from the normal direction of the surface of the planar light emitting element, the support member 40C is disposed between the light emitting portions R1 adjacent to each other in the direction in which the planar light emitting elements 10C and 10D adjacent to each other are aligned (DR1 direction in the drawing). The formed first region R3C overlaps with the second region R4C formed between the adjacent planar light emitting elements 10 in the direction in which the adjacent planar light emitting elements 10C and 10D are arranged (DR1 direction in the drawing). Provided in the third region R5B.

  When viewed from the normal direction of the surface of the planar light emitting element, the support member 40D is disposed between the light emitting portions R1 adjacent to each other in the direction in which the planar light emitting elements 10D and 10A adjacent to each other are aligned (DR2 direction in the drawing). The first region R3D formed overlaps the second region R4D formed between the adjacent planar light emitting elements 10 in the direction in which the adjacent planar light emitting elements 10D, 10A are arranged (in the direction DR2 in the drawing). Provided in the third region R5D.

  Thus, by providing support members 40A, 40B, 40C, and 40D, even when many planar light emitting elements are arranged in a matrix, a luminance difference is reduced in the gap between adjacent planar light emitting elements. Therefore, the same effect as in the first embodiment can be obtained.

  In the first and second embodiments and the modifications described above, it is preferable that at least a portion of the support member 40 located between the optical member 30 and the holding member 20 has light transmittance. In this case, at least the support 42 is made of a transparent resin. It can suppress that the light which goes around from light emission part R1 is scattered by the support body 42, and, thereby, the brightness nonuniformity in the clearance gap between the planar light emitting elements 10 adjacent to each other can be reduced. The fixture 41 can be made of a metal material, but is preferably made of a transparent resin. In this case, it becomes difficult to visually recognize the support member 40, the design is improved, and the light utilization efficiency is increased.

  In the above-described first and second embodiments and modifications, the case where the planar light emitting element is a so-called bottom emission type organic EL element has been described as an example. However, the present invention is not limited to this, and the top emission type is described. The organic EL element may be used. The planar light emitting element 10 may be composed of a plurality of light emitting diodes (LEDs) and a diffusion plate, or may be composed of a cold cathode tube or the like.

  In the above-described first and second embodiments and modifications, the case where the planar light emitting element and the light emitting portion R1 have a rectangular shape has been described as an example. However, the present invention is not limited to this, and a polygonal shape, a circular shape, or the like You may have.

  Although the embodiments of the present invention have been described above, the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, and includes meanings equivalent to the terms of the claims and all modifications within the scope.

  10, 10A, 10B, 10C, 10D Planar light emitting element, 10a surface, 10b back surface, 12 transparent substrate, 13 anode, 14 organic layer, 15 cathode, 16 sealing layer, 17 insulating layer, 18, 19 electrode part, 20 Holding member, 30 Optical member, 31 Through hole, 40, 40A, 40B, 40C, 40D Support member, 41 Fixing tool, 42 Support body, 43 Insertion hole, 100, 100A Illumination device.

Claims (5)

A plurality of planar light emitting elements each including a front surface and a back surface and arranged in a matrix;
A holding member that holds the plurality of planar light emitting elements from the back side of the planar light emitting element;
An optical member disposed so as to face the plurality of planar light emitting elements from the surface side of the planar light emitting element at an interval with respect to the plurality of planar light emitting elements;
A support member provided on the holding member and supporting the optical member;
The planar light emitting element further includes a light emitting part that emits light from the surface side and a non-light emitting part located on an outer periphery of the light emitting part,
In a first direction in which the planar light emitting elements adjacent to each other are arranged, a first region is formed between the light emitting units adjacent to each other, and a second region is formed between the planar light emitting elements adjacent to each other,
The illumination device, wherein the support member is provided in a third region where the first region and the second region overlap when viewed from the normal direction of the surface of the planar light emitting element.   The lighting device according to claim 1, wherein the planar light emitting element and the light emitting unit have a rectangular shape when viewed from a normal direction of the surface of the planar light emitting element. When viewed from the normal direction of the surface of the planar light emitting element, the third region includes a fourth region of a rectangular shape whose centers coincide with each other,
The length of the fourth region along the first direction is half of the interval between the planar light emitting elements adjacent to each other in the first direction,
The length of the fourth region along the second direction orthogonal to the first direction is half of the length of the light emitting unit along the second direction;
The lighting device according to claim 2, wherein the support member is provided in the fourth region.   The lighting device according to claim 1, wherein a surface of the support member facing a space formed between the optical member and the holding member has light diffusibility.   The illuminating device according to claim 1, wherein at least a portion of the support member located between the optical member and the holding member has light transmittance.

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