JPWO2015163067A1 - Surface emitting unit - Google Patents

Abstract

The present invention provides a surface emitting unit capable of suppressing a chromaticity difference between light irradiated from a position corresponding to a light emitting unit of a surface emitting light source and light irradiated from a position corresponding to a non-light emitting unit of the surface emitting light source. For the purpose. The surface light emitting unit (1) of the present invention includes a light emitting portion (R1) and a non-light emitting portion (R2) provided around the light emitting portion (R1), and is arranged in a planar shape so that the non-light emitting portions (R2) are adjacent to each other. A plurality of surface-emitting light sources (10), a planar light-transmitting member (30) disposed on the light emitting side of the surface-emitting light source (10) so as to cover the plurality of surface-emitting light sources (10), and light An optical adjustment member (40) disposed on the light exit side of the transmissive member (30). In the optical adjustment member (40), the chromaticity of light transmitted from the portion corresponding to the light emitting portion (R1) in the light transmitting member (30) corresponds to the non-light emitting portion (R2) in the light transmitting member. The chromaticity of the light transmitted through the light transmissive member (30) is adjusted so as to approach the chromaticity of the light transmitted from the portion.

Description

  The present invention relates to a surface emitting unit including a surface emitting light source.

  A surface emitting unit including a surface emitting light source constituted by an organic EL (Electro Luminescence) element or the like is widely used in the industry as a backlight for a liquid crystal display, a backlight for a signboard illumination, and the like without being limited to a lighting device. This surface emitting unit is required to be used in a relatively large area.

  In the surface emitting light source, since the light emitting part needs to be sealed or a wiring is connected to the light emitting part, a non-light emitting part is formed around the light emitting part. For this reason, when a plurality of surface-emitting light sources are arranged, there is a problem that a chromaticity difference is generated between light emitted from a position corresponding to the light emitting unit and light emitted from a position corresponding to the non-light emitting unit.

  For example, Japanese Patent Laid-Open No. 2005-353560 (Patent Document 1) and the like are disclosed as a surface light emitting unit capable of suppressing a chromaticity difference of irradiated light caused by the formation of a light emitting portion and a non-light emitting portion. Is mentioned. JP-A-2011-249190 (Patent Document 2) and the like are cited as documents that disclose a linear light source device that can suppress the chromaticity difference of light emitted from a linear light source.

  A surface light emitting unit disclosed in Patent Document 1 includes a plurality of surface emitting light sources including a light emitting portion and a non-light emitting portion, and a diffusion disposed on a light emitting side corresponding to the light emitting portions of the plurality of surface emitting light sources. And a light transmissive member arranged to cover the light emitting part and the non-light emitting part in a state where a gap exists between the diffusion part and the surface light source. By providing a V-shaped groove at a position corresponding to the non-light emitting portion on the light incident side of the light transmissive member, a chromaticity difference between the light emitting portion and the position corresponding to the non-light emitting portion is suppressed.

  The linear light source device disclosed in Patent Document 2 has a light-transmitting member in the form of a rod having a light exit surface extending along the longitudinal direction, and a reflective surface including a concave and convex groove on the back surface facing the light exit surface, A light source including a light-emitting diode facing one end surface of the light transmissive member, a diffuse reflection surface facing the outer surface of the reflection surface of the light transmissive member, and extending along the longitudinal direction of the light transmissive member. A diffuse reflector. A filter is provided between the reflective surface of the light transmissive member and the diffuse reflective surface of the diffuse reflector so that the transmittance of light in the long wavelength region of the light from the light source is lower than the transmittance of light in the short wavelength region. The filter is configured such that the difference between the light transmittance in the long wavelength region and the light transmittance in the short wavelength region increases from one end surface to the other end surface of the light transmissive member.

JP 2005-353560 A JP 2011-249190 A

  However, it cannot be said that the surface light emitting unit disclosed in Patent Document 1 can sufficiently suppress the chromaticity difference.

  In general, a light-transmitting member made of acrylic resin, glass, or the like is more likely to absorb light in a short wavelength region than light in a long wavelength region, so that light in a shorter wavelength region than light transmittance in a long wavelength region is used. The transmittance is lowered. Further, as the distance passing through the light transmissive member increases, the amount of light absorbed in the short wavelength region increases.

  In the surface emitting unit disclosed in Patent Document 1, the light emitted from the position corresponding to the non-light-emitting portion is guided by the light emitted from the light-emitting portion and incident on the light-transmitting member. However, it is taken out by being reflected by the V-shaped groove. On the other hand, the light emitted from the position corresponding to the light emitting part contains a lot of light emitted linearly from the light emitting part in the thickness direction of the light transmissive member.

  For this reason, the light emitted from the position corresponding to the non-light emitting part moves out in the light transmissive member over a longer distance than the light irradiated from the position corresponding to the light emitting part, and then is extracted outside. Thereby, the light irradiated from the position corresponding to a non-light-emitting part has lost the light of a short wavelength region rather than the light irradiated from the position corresponding to a light-emitting part. As a result, in the surface light emitting unit, there is a concern that a difference in chromaticity may occur because light having different ratios of the long wavelength and the short wavelength is irradiated at positions corresponding to the light emitting part and the non-light emitting part.

  Moreover, in the linear light source device disclosed in Patent Document 2, although the chromaticity difference is suppressed on the emission surface extending along the longitudinal direction of the linear light source device, light emission of a plurality of surface emitting light sources arranged It does not suppress the chromaticity difference between the positions corresponding to the part and the non-light emitting part.

  The present invention has been made in view of the above problems, and an object of the present invention corresponds to light emitted from a position corresponding to a light emitting portion of a surface light source and a non-light emitting portion of the surface light source. An object of the present invention is to provide a surface emitting unit capable of suppressing a chromaticity difference from light irradiated from a position.

  A surface light emitting unit according to the present invention includes a light emitting portion and a non-light emitting portion provided around the light emitting portion, and a plurality of surface emitting light sources arranged in a planar shape so that the non-light emitting portions are adjacent to each other; A planar light transmitting member disposed on the light emitting side of the surface emitting light source so as to cover the surface emitting light source, and an optical adjusting member disposed on the light emitting side of the light transmitting member. The optical adjustment member is configured such that the chromaticity of light transmitted through a portion corresponding to the light emitting portion of the light transmissive member is a color of light transmitted through a portion corresponding to the non-light emitting portion of the light transmissive member. The chromaticity of the light transmitted through the light transmissive member is adjusted so as to approach the degree.

  In the surface emitting unit according to the present invention, the optical adjustment member is provided so that either one of the transmittance on the long wavelength side and the transmittance on the short wavelength side is lower than the other in the visible light region. It is preferable that

  In the surface emitting unit according to the present invention, it is preferable that the optical adjustment member is provided so that the transmittance on the short wavelength side is lower than the transmittance on the long wavelength side in the visible light region. .

  In the surface light emitting unit according to the present invention, the optical adjustment member preferably includes a scatterer, and the scatterer reaches the optical adjustment member by guiding light in the light transmissive member. It is preferable to scatter light.

  In the surface light emitting unit according to the present invention, the brightness of the light transmitted from the portion corresponding to the light emitting portion of the light transmissive member by the optical adjustment member is the non-light transmittance of the light transmissive member. It is preferable to adjust the luminance of the light transmitted through the light transmissive member so as to approach the luminance of the light transmitted through the portion corresponding to the light emitting unit.

  In the surface light emitting unit according to the present invention, it is preferable that the light transmissive member has a main surface facing an incident surface incident from the surface light emitting source. In this case, it is preferable that the optical adjustment member is constituted by an ink member applied on the main surface.

  In the surface light emitting unit according to the present invention, it is preferable that the light transmissive member has a main surface facing an incident surface incident from the surface light emitting source. In this case, it is preferable that the optical adjustment member is constituted by a sheet-like member to which an ink member is applied, and the sheet-like member is disposed on the main surface of the light transmissive member. Is preferred.

  In the surface light emitting unit according to the present invention, on the main surface of the light transmissive member, there are an application region where the ink member is applied and an uncoated region where the ink member is not applied. Preferably it is formed. In this case, it is preferable that the chromaticity of the light transmitted through the light transmissive member is adjusted by adjusting the ratio of the coating region occupying the main surface.

  In the surface light emitting unit according to the present invention, the density of the ink member decreases in the form of dots or from a position corresponding to the central portion of the light emitting portion to a position corresponding to the non-light emitting portion. Thus, it is preferably distributed in a gradation.

  In the surface light emitting unit according to the present invention, the ink member includes at least a first ink member provided so as to cover a portion corresponding to the light emitting portion of the main surface of the light transmissive member; And a second ink member provided on the first ink member.

  In the surface light emitting unit according to the present invention, the density of the second ink member increases in a dot shape or from a position corresponding to the central portion of the light emitting portion toward a position corresponding to the non-light emitting portion. It is preferably distributed in a gradation so as to be low.

  In the surface emitting unit according to the present invention, the ink member preferably includes at least one of a white ink member and a light yellow ink member.

  The surface emitting unit according to the present invention preferably further includes a diffusing member provided on the light emitting side of the optical adjusting member.

  In the surface emitting unit according to the present invention, it is preferable that the surface emitting light source and the light transmissive member are optically adhered to each other on the surfaces facing each other.

  According to the present invention, there is provided a surface emitting unit capable of suppressing a chromaticity difference between light irradiated from a position corresponding to a light emitting unit of a surface emitting light source and light irradiated from a position corresponding to a non-light emitting unit of the surface emitting light source. Can be provided.

It is a schematic sectional drawing of the surface emitting unit which concerns on Embodiment 1 of this invention. It is a top view of the surface emitting unit shown in FIG. It is a figure which shows the light which passes the inside of the surface emitting unit shown in FIG. It is a figure which shows the light which passes the inside of the surface emitting unit which concerns on a modification. It is a top view which shows the structure of the optical adjustment member in the surface emitting unit which concerns on Embodiment 2 of this invention. It is a figure which shows the light which passes the inside of the surface emitting unit shown in FIG. It is a top view which shows the structure of the optical adjustment member in the surface emitting unit which concerns on Embodiment 3 of this invention. It is a top view which shows the structure of the optical adjustment member in the surface emitting unit which concerns on Embodiment 4 of this invention. It is a top view which shows the structure of the optical adjustment member in the surface emitting unit which concerns on Embodiment 5 of this invention. It is a top view which shows the structure of the optical adjustment member in the surface emitting unit which concerns on Embodiment 6 of this invention. It is a top view which shows the structure of the optical adjustment member in the surface emitting unit which concerns on Embodiment 7 of this invention. It is a figure which shows the color temperature of the light irradiated from the position corresponding to a light emission part, and the light irradiated from the position corresponding to a non-light-emission part with and without the optical adjustment member shown in FIG.

  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.

(Embodiment 1)
FIG. 1 is a schematic cross-sectional view of a surface emitting unit according to the present embodiment. FIG. 2 is a plan view of the surface emitting unit shown in FIG. With reference to FIG. 1 and FIG. 2, the surface emitting unit 1 which concerns on this Embodiment is demonstrated.

  As shown in FIGS. 1 and 2, the surface emitting unit according to the present embodiment includes a plurality of surface emitting light sources 10, an adhesion layer 20, a light transmissive member 30, an optical adjustment member 40, and a diffusion member 50. And comprising. Each of the surface emitting light sources 10 includes a light emitting portion R1 and a non-light emitting portion R2 provided around the light emitting portion R1. The plurality of surface emitting light sources 10 are arranged in a planar shape so that the non-light emitting portions R2 are adjacent to each other.

  The surface emitting light source 10 is composed of, for example, an organic EL element. The surface emitting light source 10 includes a transparent substrate 11, an anode 12, an organic layer 13, a cathode 14, a sealing layer 15, and an insulating layer 16. On the main surface 11a of the transparent substrate 11, an anode 12, an organic layer 13, and a cathode 14 are sequentially laminated.

  The transparent substrate 11 is composed of various glass substrates, for example. As a member constituting the transparent substrate 11, a film substrate such as PET or PC may be used.

  The anode 12 is a conductive film having transparency. In order to form the anode 12, ITO (Indium Tin Oxide) or the like is formed on the transparent substrate 11 by sputtering or the like. The anode 12 is formed by patterning the ITO film into a predetermined shape by photolithography or the like. The anode 12 in the present embodiment is divided into two regions by patterning in order to form an electrode portion 17 (for anode) and an electrode portion 18 (for cathode).

  The organic layer 13 (light emitting unit) can generate light (visible light) by being supplied with electric power. The organic layer 13 may be composed of a single light emitting layer, or may be composed of a hole transporting layer, a light emitting layer, a hole blocking layer, an electron transporting layer, and the like that are sequentially laminated.

  The cathode 14 is, for example, aluminum (Al). The cathode 14 is formed so as to cover the organic layer 13 by a vacuum deposition method or the like. In order to pattern the cathode 14 into a predetermined shape, a mask may be used during vacuum deposition.

An insulating layer 16 is provided between the cathode 14 and the anode 12 on the electrode part 17 side so that the cathode 14 and the anode 12 are not short-circuited. A portion of the cathode 14 opposite to the side on which the insulating layer 16 is provided is connected to the anode 12 on the electrode portion 18 side. The insulating layer 16 is formed in a desired pattern so as to cover a portion that insulates the anode 12 and the cathode 14 from each other using a photolithography method or the like after SiO ₂ or the like is formed using a sputtering method, for example. .

  The sealing layer 15 is made of an insulating resin or a glass substrate. The sealing layer 15 is formed to protect the organic layer 13 from moisture and the like. The sealing layer 15 seals substantially the whole of the anode 12, the organic layer 13, and the cathode 14 on the transparent substrate 11. A part of the anode 12 is exposed from the sealing layer 15 for electrical connection.

  The portion exposed from the sealing layer 15 of the anode 12 (on the left side in FIG. 4) constitutes an electrode portion 17. The electrode part 17 and the anode 12 are made of the same material. The electrode part 17 is located in the outer peripheral part of the surface emitting light source 10. The portion of the anode 12 exposed from the sealing layer 15 (on the right side in FIG. 4) constitutes an electrode portion 18. The electrode portion 18 and the anode 12 are made of the same material. The electrode portion 18 is also located on the outer peripheral portion of the surface emitting light source 10. The electrode part 17 and the electrode part 18 are located on the opposite sides of the organic layer 13. A wiring pattern (not shown) is attached to the electrode portion 17 and the electrode portion 18 using soldering (silver paste) or the like.

  In the surface-emitting light source 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 main surface 11b (light emitting surface) of the transparent substrate 11 on the side opposite to the side where each layer is formed, and is substantially in the region where the organic layer 13 is formed. It corresponds. 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 17 and 18 are formed. White light is emitted from the light emitting portion R1.

  The outer size of the transparent substrate 11 is 100 mm wide (left and right direction in FIG. 2) × depth (up and down direction in FIG. 2) 100 mm, and the outer size of the light emitting part R1 is 90 mm wide × 90 mm deep. The widths of the non-light emitting portions R2 located on both sides of the light emitting portion R1 are each 5 mm.

  The adhesion layer 20 optically adheres the light transmissive member 30 and the surface light source 10. As the adhesion layer 20, a transparent adhesive film, a transparent gel, a transparent optical adhesive, or the like can be used. By using the transparent and flexible member as described above as the adhesion layer 20, it is possible to suppress the total reflection at the interface while improving the adhesion between the light transmissive member 30 and the surface emitting light source 10. , Optical loss can be reduced. The thickness of the adhesion layer 20 is, for example, 0.2 mm.

  The light transmissive member 30 has a plate shape and is disposed on the light emitting side of the surface light source 10 so as to cover the plurality of surface light sources 10. The light transmissive member 30 has an incident surface 31 on which light from the surface emitting light source 10 is incident, and a main surface 32 facing the incident surface 31. Light incident on the light transmissive member 30 from the surface emitting light source 10 through the adhesion layer 20 and the incident surface 31 is guided through the light transmissive member 30 and emitted from the main surface 32.

  The light transmissive member 30 and the surface emitting light source 10 are in optical contact with each other through the contact layer 20 on the surfaces facing each other. Specifically, the incident surface 31 of the light transmissive member 30 and the main surface 11 b of the transparent substrate 11 of the surface emitting light source are in close contact with each other through the adhesive layer 20.

  As the light transmissive member 30, for example, a light transmissive resin member having flexibility such as an acrylic resin or a silicone resin is used. Moreover, as the light transmissive member 30, for example, various glass members having flexibility may be used. These members have the property of absorbing light in the short wavelength range more easily than light in the long wavelength range. Moreover, the thickness of the light transmissive member 30 is 5 mm, for example.

  The optical adjustment member 40 is disposed on the light emitting side of the light transmissive member 30. The optical adjustment member 40 mainly adjusts the chromaticity of the light transmitted through the light transmissive member 30. Specifically, the optical adjustment member 40 has a chromaticity of light transmitted from a portion corresponding to the light emitting portion R1 in the light transmitting member 30 from a portion corresponding to the non-light emitting portion R2 in the light transmitting member 30. The chromaticity of the light transmitted through the light transmissive member 30 is adjusted so as to approach the chromaticity of the transmitted light. The reason why the chromaticity can be adjusted as described above will be described later with reference to FIG.

  The optical adjustment member 40 may be configured by an ink member 41 (see FIG. 3) to be described later applied on the main surface 32 of the light transmissive member 30, or a sheet-like member to which the ink member 41 is applied. May be. Moreover, the optical adjustment member 40 may be comprised by the sheet-like member containing a pigment | dye. The sheet-like member is disposed on the main surface 32 of the light transmissive member 30.

  The ink member 41 is applied on the main surface 32 of the light transmissive member 30 or a sheet-like member by using a spin coat method, an ink jet method, a printing method, or the like.

  In the case of using a sheet-like member to which the ink member 41 has been applied in advance, the step of applying the ink member 41 to the main surface 32 of the light transmissive member 30 and the step of curing the applied ink member 41 become unnecessary. Therefore, the manufacturing process can be simplified.

  The ink member 41 is provided so as to cover at least a part of the light transmissive member 30 corresponding to the light emitting portion R1. In the present embodiment, the ink member 41 is provided in a flat film shape so as to cover the entire portion of the light transmissive member 30 corresponding to the light emitting portion R1, and in the portion corresponding to the non-light emitting portion R2. Is not provided (FIG. 3). The ink member 41 is provided so as to have a uniform density.

  The ink member 41 has, for example, a transmittance on the short wavelength side that is lower than a transmittance on the long wavelength side in the visible light region, or a higher absorptance on the short wavelength side than that on the long wavelength side. It is provided as follows. The color of the ink member 41 is preferably white or light yellow.

  The diffusing member 50 is provided on the light emitting side of the optical adjustment member 40. The diffusion member 50 diffuses the light optically adjusted by the optical adjustment member 40 and transmits it to the outside. The diffusing member 50 has, for example, a Haze value of 90% and a light transmittance of 80%. The thickness of the diffusion member 50 is 2 mm, for example.

  As the diffusion member 50, for example, a scattering sheet can be used. As the scattering sheet, it is possible to use a sheet that scatters light by using an internal scattering action by containing fine particles inside, or a sheet that scatters light by using an interface reflection action by having irregularities on the surface. is there.

  FIG. 3 is a diagram showing light passing through the surface emitting unit shown in FIG. In FIG. 3, the diffusing member 50 is omitted for convenience. With reference to FIG. 3, the light passing through the surface emitting unit will be described.

  As shown in FIG. 3, the light emitted from the light emitting portion R <b> 1 is transmitted through the light transmissive member 30, and the portion of the light transmissive member 30 corresponding to the light emitting portion R <b> 1 and the non-light transmissive member 30 are not. The light is emitted from the portion corresponding to the light emitting portion R2. Note that the light emitted from the light emitting unit R1 has a white color.

  The light L1 transmitted through the portion corresponding to the light emitting portion R1 in the light transmissive member 30 is more than the light L2 transmitted through the portion corresponding to the non-light emitting portion R2 in the light transmissive member 30. It contains a lot of light traveling along the thickness direction. For this reason, the optical path length when passing through the light transmissive member 30 is shortened, and the amount of light absorbed by the light transmissive member 30 is reduced.

  On the other hand, the light L2 that has passed through the portion corresponding to the non-light emitting portion R2 of the light transmissive member 30 propagates (guides) the light transmissive member 30 while being repeatedly reflected in the light transmissive member 30, and is extracted. Light. For this reason, the optical path length when passing through the light transmissive member 30 becomes long, and the amount of light absorbed by the light transmissive member 30 increases.

  Since the light transmissive member 30 made of acrylic resin or the like is more likely to absorb light in the short wavelength region than light in the long wavelength region, the light transmissive member 30 has a shorter wavelength than the light transmittance in the long wavelength region. The light transmittance of the area is lowered.

  Therefore, the light L1 transmitted through the portion corresponding to the light emitting portion R1 in the light transmissive member 30 has little loss of light on the short wavelength side and maintains white. On the other hand, the light L2 that has passed through the portion corresponding to the non-light emitting portion R2 in the light transmissive member 30 has a lot of light loss on the short wavelength side and is yellowish.

  Here, in the present embodiment, the ink member 41 is provided so as to entirely cover only the portion of the light transmissive member 30 corresponding to the light emitting portion R1. For this reason, the light L <b> 1 that has passed through the portion of the light transmissive member 30 corresponding to the light emitting portion R <b> 1 passes through the ink member 41. Since the ink member 41 is provided so that the transmittance on the short wavelength side is lower than the transmittance on the long wavelength side in the visible light region, the light L3 extracted from the ink member 41 is light from the short wavelength side. It reaches the diffusion member 50 in a lost state. That is, the light L3 extracted from the ink member 41 is yellowish.

  On the other hand, since the ink member 41 is not provided in the portion of the light transmissive member 30 corresponding to the non-light emitting portion R2, the light L2 transmitted through the portion of the light transmissive member 30 corresponding to the non-light emitting portion R2 is The diffusion member 50 is reached while maintaining a yellowish state.

  Thereby, in the surface light emitting unit 1, the color of light emitted from the position corresponding to the light emitting part R1 is substantially the same as the color emitted from the position corresponding to the non-light emitting part R2. As a result, when the surface light emitting unit 1 is viewed from the light emitting surface side, the color between the chromaticity of light emitted from the position corresponding to the light emitting portion R1 and the chromaticity emitted from the position corresponding to the non-light emitting portion R2. The degree difference appears to be suppressed.

  As described above, in the surface light emitting unit 1 according to the present embodiment, the chromaticity of the light transmitted by the optical adjustment member 40 through the portion corresponding to the light emitting portion R1 in the light transmissive member 30 is light transmissive. The light emitting portion R1 of the surface light source 10 is adjusted by adjusting the chromaticity of the light transmitted through the light transmissive member so as to approach the chromaticity of the light transmitted through the portion corresponding to the non-light emitting portion R2 of the conductive member 30. It is possible to suppress a chromaticity difference between light emitted from a position corresponding to 1 and light emitted from a position corresponding to the non-light emitting portion R2 of the surface light source 10.

(Modification)
FIG. 4 is a diagram illustrating light passing through the surface emitting unit according to the modification. In FIG. 3, the diffusing member 50 is omitted for convenience. With reference to FIG. 4, the surface emitting unit 1A according to the present modification will be described.

  As shown in FIG. 4, in this modification, the ink member 41 includes a scatterer 60 inside.

  For example, in the light emitted from the light emitting unit R1, the color of each color light of red light, blue light, and green light is additively mixed in a state that deviates from an appropriate wavelength, and therefore includes a lot of light on the long wavelength side. There is. In such a case, light having a short wavelength side is absorbed by the light transmissive member 30, so that the light emitted from the position corresponding to the non-light emitting portion R <b> 2 in the surface light emitting unit 1 has a long wavelength. The light on the side will be emphasized. For this reason, the light irradiated from the position corresponding to non-light-emitting part R2 may be reddish.

  In the present modification, the ink member 41 includes the scatterer 60 therein, so that the light reaching the interface with the optical adjustment member 40 through the light transmissive member 30 is scattered. For this reason, before a part of the light emitted from the light emitting portion R1 and repeatedly propagating through the light transmissive member 30 is extracted from the portion of the light transmissive member 30 corresponding to the non-light emitting portion R2, Scattered by the scatterer 60.

  Thereby, in the surface light emission unit 1, a part of reddish light which is going to be irradiated from the position corresponding to the non-light-emitting part R2 can be irradiated from the position corresponding to the light-emitting part R1. As a result, the light of the long wavelength component irradiated from the position corresponding to the non-light emitting portion R2 is decreased, and the light of the long wavelength component irradiated from the position corresponding to the light emitting portion R1 is increased.

  Thus, the chromaticity of the light emitted from the position corresponding to the light emitting part R1 is adjusted by adjusting the wavelength component of the light emitted from the position corresponding to the light emitting part R1 and the position corresponding to the non-light emitting part R2. However, it approaches the chromaticity of light emitted from a position corresponding to the non-light emitting portion R2. For this reason, when the surface light emitting unit 1 is viewed from the light emitting surface side, the chromaticity difference at the positions corresponding to the light emitting portion R1 and the non-light emitting portion R2 appears to be suppressed.

  As described above, also in the surface light emitting unit 1A according to this modification, the light emitted from the position corresponding to the light emitting part R1 of the surface light source 10 and the light emitted from the position corresponding to the non-light emitting part R2 of the surface light source 10 are used. The chromaticity difference with the light to be used can be suppressed.

(Embodiment 2)
FIG. 5 is a plan view showing the configuration of the optical adjustment member in the surface emitting unit according to the present embodiment. With reference to FIG. 5, surface emitting unit 1B according to the present embodiment will be described.

  As shown in FIG. 5, the surface light emitting unit 1 according to the present embodiment is different from the surface light emitting unit 1 according to the first embodiment in that the ink members 41 are distributed in a dot shape. Other configurations are almost the same. The ink member 41 is preferably provided at least at a position corresponding to the light emitting portion R1, and is preferably provided at both a position corresponding to the light emitting portion R1 and a position corresponding to the non-light emitting portion R2.

  By providing the ink member 41 in a dot shape, an application region where the ink member 41 is applied and an unapplication region where the ink member 41 is not applied are formed on the main surface 32 of the light transmissive member 30. Is done. In the present embodiment, the ratio of the application region that occupies the main surface 32 of the light transmissive member 30 is adjusted.

  Specifically, the ink member 41 is applied such that the dot density is high at the position corresponding to the light emitting portion R1 in the light transmissive member 30 and the dot density is low at the position corresponding to the non-light emitting portion R2. ing. With this configuration, the optical adjustment member 40 has a luminance adjustment function in addition to the above-described chromaticity adjustment function. Specifically, in the optical adjustment member 40, the luminance of light transmitted from the portion corresponding to the light emitting portion R <b> 1 in the light transmissive member 30 is transmitted from the portion corresponding to the non-light emitting portion R <b> 2 in the light transmissive member 30. The brightness of the light transmitted through the light transmissive member 30 is adjusted so as to approach the brightness of the light.

  FIG. 6 is a view showing light passing through the surface emitting unit shown in FIG. In FIG. 6, the diffusing member 50 is omitted for convenience. With reference to FIG. 6, the brightness | luminance adjustment function which the optical adjustment member 40 has is demonstrated.

  Since the non-light emitting portion R2 is away from the light emitting portion R1, the amount of light that wraps around from the light emitting portion R1 is reduced. For this reason, the brightness | luminance of the light which permeate | transmitted the part corresponding to non-light-emitting part R2 among the light transmissive members 30 becomes lower than the brightness | luminance of the light which permeate | transmitted the part corresponding to light emission part R1 among the light transmissive members 30. .

  As shown in FIG. 6, the ink member 41 is distributed in a dot shape so as to have the above-described density distribution, so that the position corresponding to the light emitting portion R1 is compared with the position corresponding to the non-light emitting portion R2. The ratio of the light L3 that passes through the ink member 41 increases. Thereby, in the surface light emitting unit 1, the light transmittance is lower at the position corresponding to the light emitting portion R1 than at the position corresponding to the non-light emitting portion R2.

  Thus, the transmittance | permeability differs, The brightness | luminance of the light which permeate | transmitted the part corresponding to light emission part R1 among the light transmissive members 30 permeate | transmitted the part corresponding to non-light-emitting part R2 among the light transmissive members 30. It approaches the brightness of light. For this reason, when the surface light emitting unit 1 is viewed from the light emitting surface side, the luminance difference between the positions corresponding to the light emitting portion R1 and the non-light emitting portion R2 appears to be suppressed.

  In addition, since the ink member 41 is provided so that the transmittance on the short wavelength side is lower than the transmittance on the long wavelength side in the visible light region as described above, the light emitting portion R1 of the light transmissive member 30. The color of the light transmitted through the light transmitting member 30 so that the chromaticity of the light transmitted through the portion corresponding to the light approaches the chromaticity of the light transmitted through the portion corresponding to the non-light emitting portion R2 of the light transmitting member 30 The degree is adjusted.

(Embodiment 3)
FIG. 7 is a plan view showing the configuration of the optical adjustment member in the surface emitting unit according to the present embodiment. With reference to FIG. 7, the surface emitting unit 1C according to the present embodiment will be described.

  As shown in FIG. 7, the surface light emitting unit 1C according to the present embodiment has a non-light emitting portion R2 from a position corresponding to the central portion of the light emitting portion R1 when compared with the surface light emitting unit 1 according to the first embodiment. It is different in that it is distributed in a gradation so that the density becomes lower toward the position corresponding to. Other configurations are substantially the same.

  The ink member 41 is provided so as to cover at least a portion of the light transmissive member 30 corresponding to the light emitting portion R1. That is, the ink member 41 may be provided so as to cover only a portion corresponding to the light emitting portion R1 of the light transmissive member 30, or corresponds to the entire region corresponding to the light emitting portion R1 and the non-light emitting portion R2. It may be provided so as to cover a part of the portion, or may be provided so as to cover the entire region corresponding to the light emitting portion R1 and the entire region corresponding to the non-light emitting portion R2. Thus, also in the present embodiment, the ratio of the application region that occupies the main surface 32 of the light transmissive member 30 is appropriately adjusted.

  Also in this case, as in the second embodiment, in the surface light emitting unit 1C, the light transmittance is lower at the position corresponding to the light emitting portion R1 than at the position corresponding to the non-light emitting portion R2. Thereby, in the light transmitted through the light transmissive member 30, the light having different luminance in the portion corresponding to the light emitting portion R 1 and the non-light emitting portion R 2 is approximated by the difference in transmittance. Adjusted. That is, the brightness of the light transmitted through the portion corresponding to the light emitting portion R1 in the light transmissive member 30 by the ink member 41 is changed from the luminance of the light transmitted from the portion corresponding to the non-light emitting portion R2 in the light transmissive member 30. Get closer to.

  In addition, since the ink member 41 is provided so that the transmittance on the short wavelength side is lower than the transmittance on the long wavelength side in the visible light region as described above, the light emitting portion R1 of the light transmissive member 30. The chromaticity is adjusted so that the chromaticity of the light transmitted from the portion corresponding to 1 approaches the chromaticity of the light transmitted from the portion of the light transmissive member 30 corresponding to the non-light emitting portion R2.

  By adopting the configuration as described above, the surface emitting unit 1B according to the present embodiment is arranged in the light emitting unit R1 and the non-light emitting unit R2 of the surface emitting light source 10 in the same manner as the surface emitting unit 1B according to the second embodiment. While suppressing the chromaticity difference at the corresponding position, the luminance difference at the position corresponding to the light emitting portion R1 and the non-light emitting portion R2 can be suppressed.

(Embodiment 4)
FIG. 8 is a plan view showing the configuration of the optical adjustment member in the surface emitting unit according to the present embodiment. With reference to FIG. 8, surface emitting unit 1D according to the present embodiment will be described.

  As shown in FIG. 8, the surface light emitting unit 1D according to the present embodiment has ink members that are the first ink member 41D and the second ink member 42D when compared with the surface light emitting unit 1 according to the first embodiment. Is different in that it includes Other configurations are substantially the same.

  The first ink member 41D is provided so as to cover almost the entire area of the main surface 32 of the light transmissive member 30. The first ink member 41D has a flat film shape, and its density distribution is provided substantially uniformly.

  The second ink member 42D is distributed in a dot shape on the first ink member 41D. The second ink member 42D is preferably provided at both the position corresponding to the light emitting portion R1 and the position corresponding to the non-light emitting portion R2. The second ink member 42D is applied such that the dot density is high at a position corresponding to the light emitting portion R1, and the dot density is low at a position corresponding to the non-light emitting portion R2.

  The first ink member 41D is preferably white, and the second ink member 42D is preferably light yellow. The first ink member 41D may be light yellow and the second ink member 42D may be white.

  Even in this case, in the surface light emitting unit 1E, the light transmittance is lower at the position corresponding to the light emitting portion R1 than at the position corresponding to the non-light emitting portion R2. Thereby, in the light transmitted through the light transmissive member 30, the light having different luminance in the portion corresponding to the light emitting portion R 1 and the non-light emitting portion R 2 is approximated by the difference in transmittance. Adjusted. That is, the optical adjustment member 40 is configured such that the luminance of the light transmitted through the portion corresponding to the light emitting portion R1 in the light transmissive member 30 corresponds to the light transmitted through the portion corresponding to the non-light emitting portion R2 in the light transmissive member 30. The brightness of the light transmitted through the light transmissive member 30 is adjusted so as to approach the brightness.

  Further, the first ink member 41D and the second ink member 42D are provided so that the transmittance on the short wavelength side is lower than the transmittance on the long wavelength side in the visible light region. The light transmitting member 30 is transmitted so that the chromaticity of the light transmitted through the portion corresponding to the light emitting portion R1 approaches the chromaticity of the light transmitted through the portion corresponding to the non-light emitting portion R2 in the light transmitting member 30. The chromaticity of the light to be adjusted is adjusted.

  With the configuration as described above, the surface emitting unit 1D according to the present embodiment is positioned corresponding to the light emitting unit and the non-light emitting unit of the surface emitting light source, similarly to the surface emitting unit 1B according to the second embodiment. The luminance difference between the positions corresponding to the light-emitting portion R1 and the non-light-emitting portion R2 can be suppressed while suppressing the chromaticity difference.

(Embodiment 5)
FIG. 9 is a plan view showing the configuration of the optical adjustment member in the surface emitting unit according to the present embodiment. With reference to FIG. 9, surface emitting unit 1E according to the present embodiment will be described.

  As shown in FIG. 9, the surface light emitting unit 1E according to the present embodiment has ink members that are the first ink member 41E and the second ink member 42E when compared with the surface light emitting unit 1 according to the first embodiment. Is different in that it includes Other configurations are substantially the same.

  The first ink member 41 </ b> E is provided so as to cover almost the entire area of the main surface 32 of the light transmissive member 30. The first ink member 41E has a flat film shape, and its density distribution is provided substantially uniformly.

  The second ink member 42E is distributed in a gradation on the first ink member 41E so that the density decreases from the position corresponding to the central portion of the light emitting portion R1 to the position corresponding to the non-light emitting portion R2. .

  The second ink member 42E is provided on the first ink member 41E so as to cover at least a position corresponding to the non-light emitting portion R2. That is, the second ink member 42E may be provided on the first ink member 41E so as to cover only the portion corresponding to the light emitting portion R1, or the entire region corresponding to the light emitting portion R1 and the non-light emitting portion. It may be provided so as to cover a part of the part corresponding to R2, or may be provided so as to cover the entire part of the part corresponding to the light emitting part R1 and the whole part of the part corresponding to the non-light emitting part R2. .

  The first ink member 41E is preferably white, and the second ink member 42E is preferably light yellow. The first ink member 41E may be light yellow and the second ink member 42E may be white.

  Even in this case, in the surface light emitting unit 1E, the light transmittance is lower at the position corresponding to the light emitting portion R1 than at the position corresponding to the non-light emitting portion R2. Thereby, in the light transmitted through the light transmissive member 30, the light having different luminance in the portion corresponding to the light emitting portion R 1 and the non-light emitting portion R 2 is approximated by the difference in transmittance. Adjusted. That is, the optical adjustment member 40 is configured such that the luminance of the light transmitted through the portion corresponding to the light emitting portion R1 in the light transmissive member 30 corresponds to the light transmitted through the portion corresponding to the non-light emitting portion R2 in the light transmissive member 30. The brightness of the light transmitted through the light transmissive member 30 is adjusted so as to approach the brightness.

  The first ink member 41E and the second ink member 42E are provided so that the transmittance on the short wavelength side is lower than the transmittance on the long wavelength side in the visible light region. The light transmissive member 30 is adjusted so that the chromaticity of the light transmitted through the portion corresponding to the light emitting portion R1 approaches the chromaticity of the light transmitted through the portion corresponding to the non-light emitting portion R2 of the light transmissive member 30. The chromaticity of the transmitted light is adjusted.

  With the configuration as described above, the surface emitting unit 1E according to the present embodiment is positioned corresponding to the light emitting unit and the non-light emitting unit of the surface emitting light source, similarly to the surface emitting unit 1B according to the second embodiment. The luminance difference between the positions corresponding to the light-emitting portion R1 and the non-light-emitting portion R2 can be suppressed while suppressing the chromaticity difference.

(Embodiment 6)
FIG. 10 is a plan view showing the configuration of the optical adjustment member in the surface emitting unit according to the present embodiment. With reference to FIG. 10, surface emitting unit 1F according to the present embodiment will be described.

  As shown in FIG. 10, the surface light emitting unit 1 according to the present embodiment has ink members that are the first ink member 41 </ b> F and the second ink member 42 </ b> F when compared with the surface light emitting unit 1 according to the first embodiment. Is different in that it includes Other configurations are substantially the same.

  The first ink member 41F is provided at least at a position corresponding to the light emitting portion R1, and in this case, the first ink member 41F is provided so as to cover only the portion of the light transmissive member 30 corresponding to the light emitting portion R1. The second ink member 42F is provided in a dot shape on the first ink member 41F. The first ink member 41F is, for example, white, and the second ink member 42F is black or gray.

  Since the black or gray second ink member 42F easily absorbs light, when it is provided at a position corresponding to the light emitting portion R1, the transmittance of the light emitting portion R1 is lowered. For this reason, in the surface light emitting unit 1E, the light transmittance is lower at the position corresponding to the light emitting portion R1 than at the position corresponding to the non-light emitting portion R2.

  Thereby, in the light transmitted through the light transmissive member 30, the light having different luminance in the portion corresponding to the light emitting portion R 1 and the non-light emitting portion R 2 is approximated by the difference in transmittance. Adjusted. That is, the optical adjustment member 40 is configured such that the luminance of the light transmitted through the portion corresponding to the light emitting portion R1 in the light transmissive member 30 corresponds to the light transmitted through the portion corresponding to the non-light emitting portion R2 in the light transmissive member 30. The brightness of the light transmitted through the light transmissive member 30 is adjusted so as to approach the brightness.

  Further, since the first ink member 41F is provided so that the transmittance on the short wavelength side is lower than the transmittance on the long wavelength side in the visible light region, it corresponds to the light emitting part R1 in the light transmissive member 30. The chromaticity is adjusted so that the chromaticity of the light transmitted from the portion to be transmitted approaches the chromaticity of the light transmitted from the portion corresponding to the non-light emitting portion R2 in the light transmissive member 30.

  By adopting the configuration as described above, the surface emitting unit 1F according to the present embodiment is positioned corresponding to the light emitting unit and the non-light emitting unit of the surface emitting light source, similarly to the surface emitting unit 1B according to the second embodiment. The luminance difference between the positions corresponding to the light-emitting portion R1 and the non-light-emitting portion R2 can be suppressed while suppressing the chromaticity difference.

(Embodiment 7)
FIG. 11 is a plan view showing the configuration of the optical adjustment member in the surface emitting unit according to the present embodiment. With reference to FIG. 11, the surface emitting unit 1G according to the present embodiment will be described.

  As shown in FIG. 11, when the surface emitting unit 1G according to the present embodiment is compared with the surface emitting unit 1 according to the first embodiment, the optical adjustment member 40 has the main surface 32 of the light transmissive member 30. The ink member 41 provided so as to cover the entire surface of the ink member 41 is different in that the plurality of openings 43 are provided. Other configurations are almost the same.

  By providing the plurality of openings 43, an application region where the ink member 41 is applied and an unapplication region where the ink member 41 is not applied are formed on the main surface 32 of the light transmissive member 30. The In the present embodiment, the ratio of the application region that occupies the main surface 32 of the light transmissive member 30 is adjusted.

  Specifically, the plurality of openings 43 are provided so that the density is low at a position corresponding to the light emitting part R1 in the light transmissive member 30 and the density is high at a position corresponding to the non-light emitting part R2. The opening 43 is provided in a circular shape in plan view, and the radius of the opening 43 is, for example, 0.3 mm.

  Even in this case, in the surface light emitting unit 1G, the light transmittance is lower at the position corresponding to the light emitting portion R1 than at the position corresponding to the non-light emitting portion R2. Thereby, in the light transmitted through the light transmissive member 30, the light having different luminance in the portion corresponding to the light emitting portion R 1 and the non-light emitting portion R 2 is approximated by the difference in transmittance. Adjusted. That is, the optical adjustment member 40 is configured such that the luminance of the light transmitted through the portion corresponding to the light emitting portion R1 in the light transmissive member 30 corresponds to the light transmitted through the portion corresponding to the non-light emitting portion R2 in the light transmissive member 30. The brightness of the light transmitted through the light transmissive member 30 is adjusted so as to approach the brightness.

  Further, since the ink member 41 is provided so that the transmittance on the short wavelength side is lower than the transmittance on the long wavelength side in the visible light region, the portion corresponding to the light emitting portion R1 in the light transmitting member 30. The chromaticity is adjusted so that the chromaticity of the light transmitted from the chromaticity of the light transmissive member 30 approaches the chromaticity of the light transmitted from the portion corresponding to the non-light-emitting portion R2.

  With the configuration as described above, the surface emitting unit 1G according to the present embodiment is positioned corresponding to the light emitting unit and the non-light emitting unit of the surface emitting light source, similarly to the surface emitting unit 1B according to the second embodiment. The luminance difference between the positions corresponding to the light-emitting portion R1 and the non-light-emitting portion R2 can be suppressed while suppressing the chromaticity difference.

  FIG. 12 is a diagram showing the color temperature of light emitted from a position corresponding to the light emitting part and light emitted from a position corresponding to the non-light emitting part with and without the optical adjustment member shown in FIG. It is. The effect of the optical adjustment member 40 will be described with reference to FIG.

  In the surface light emitting unit, when the optical adjustment member 40 is provided, the color temperature of light emitted from the position corresponding to the non-light emitting portion R2 and the position corresponding to the light emitting portion R1 are compared with the case where the optical adjustment member is not provided. It can be confirmed that the difference from the color temperature of the light emitted from is reduced.

  In the surface light emitting unit, the color temperature of light emitted from the position corresponding to the light emitting portion R1 when the optical adjustment member 40 is present is the color temperature of light emitted from the position relative to the light emitting portion R1 when there is no optical adjustment member. Can be confirmed.

  Further, by providing the optical adjustment member 40, it can be confirmed that the degree of the color temperature to be reduced is larger at the position corresponding to the light emitting portion R1 than at the position corresponding to the non-light emitting portion R2.

  As described above, the color temperature difference is reduced by the optical adjustment member 40, so that the optical adjustment member 40 has a chromaticity of light transmitted from a portion corresponding to the light emitting portion R <b> 1 in the light transmissive member 30. It can be confirmed that the chromaticity of the light transmitted through the light transmissive member 30 is adjusted so as to approach the chromaticity of the light transmitted from the portion corresponding to the non-light emitting portion R2 of the conductive member 30.

  In the surface light emitting units according to Embodiments 1 to 7 and the modifications described above, the case where a member that easily absorbs light on the short wavelength side than light on the long wavelength side is used as the light transmissive member is illustrated. However, the present invention is not limited to this, and a member that absorbs light on the long wavelength side more easily than light on the short wavelength side may be used.

  In this case, the light transmitted through the light transmissive member corresponding to the non-light-emitting portion R2 is longer than the light transmitted through the light transmissive member 30 corresponding to the light-emitting portion R1 on the longer wavelength side. Will increase. For this reason, an ink member as an optical adjustment member is provided in the visible light region so that the transmittance on the long wavelength side is lower than the transmittance on the short wavelength side. Thereby, the optical adjustment member has the chromaticity of the light transmitted from the portion corresponding to the light emitting portion of the light transmitting member to the chromaticity of the light transmitted from the portion corresponding to the non-light emitting portion of the light transmitting member. The chromaticity of the light transmitted through the light transmissive member is adjusted so as to approach.

  As described above, the optical adjustment member has either the long wavelength side transmittance or the short wavelength side transmittance in the visible light region in accordance with the wavelength that the light transmissive member easily absorbs or the wavelength that easily transmits. What is necessary is just to provide so that it may become lower than the other.

  In the surface emitting units according to Embodiments 1 to 7 and the modifications described above, the surface emitting light source 10 has been illustrated and described as including a so-called bottom emission type organic EL element, but is not limited thereto. Alternatively, a top emission type organic EL element may be included. Moreover, the surface emitting light source 10 may be comprised from the some light emitting diode (LED) and the diffusion plate, and may be comprised using the cold cathode tube etc.

  In the surface light emitting units according to Embodiments 2 to 7 described above, the case where the scatterer is not included in the ink member is described as an example, but the present invention is not limited to this, and the scatterer is included in the ink member. It may be. In this case, similarly to the surface light emitting unit 1A according to the modified example, even if the light emitted from the light emitting unit R1 includes a lot of light on the long wavelength side, the light emitting unit emits light having a long wavelength component by the scatterer. It can be scattered toward the position corresponding to R1. Thereby, the chromaticity difference of the position corresponding to light emission part R1 and non-light emission part R2 can be suppressed.

  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 changes within the scope.

  1, 1A, 1B, 1C, 1D, 1E, 1F, 1G Surface light emitting unit, 10 surface light source, 11 transparent substrate, 12 anode, 13 organic layer, 14 cathode, 15 sealing layer, 16 insulating layer, 17, 18 Electrode portion, 20 adhesion layer, 30 light transmissive member, 31 entrance surface, 32 main surface, 40 optical adjustment member, 41 ink member, 41D, 41E, 41F first ink member, 42D, 42E, 42F second ink member, 43 openings, 50 diffusing members, 60 scatterers.

Claims (14)

A plurality of surface-emitting light sources including a light-emitting part and a non-light-emitting part provided around the light-emitting part and arranged in a planar shape so that the non-light-emitting parts are adjacent to each other;
A plate-like light transmissive member disposed on the light emitting side of the surface-emitting light source so as to cover the plurality of surface-emitting light sources;
An optical adjustment member disposed on the light exit side of the light transmissive member,
The optical adjustment member has a chromaticity of light transmitted through a portion corresponding to the light emitting portion of the light transmitting member, and a color of light transmitted through a portion corresponding to the non-light emitting portion of the light transmitting member. A surface emitting unit that adjusts the chromaticity of light transmitted through the light transmissive member so as to approach the degree.   2. The surface emitting unit according to claim 1, wherein the optical adjustment member is provided so that one of the transmittance on the long wavelength side and the transmittance on the short wavelength side is lower than the other in the visible light region. .   The surface emitting unit according to claim 2, wherein the optical adjustment member is provided so that the transmittance on the short wavelength side is lower than the transmittance on the long wavelength side in the visible light region. The optical adjustment member includes a scatterer,
4. The surface emitting unit according to claim 1, wherein the scatterer scatters light that has been guided through the light transmissive member and reached the optical adjustment member. 5.   The optical adjustment member has a luminance of light transmitted through a portion corresponding to the light emitting portion of the light transmissive member, and a luminance of light transmitted through a portion corresponding to the non-light emitting portion of the light transmissive member. The surface emitting unit according to any one of claims 1 to 4, wherein the luminance of light transmitted through the light transmissive member is adjusted so as to approach the surface light emitting unit. The light transmissive member has a main surface facing an incident surface on which light from the surface-emitting light source is incident,
The surface emitting unit according to any one of claims 1 to 5, wherein the optical adjustment member is constituted by an ink member applied on the main surface. The light transmissive member has a main surface facing an incident surface on which light from the surface-emitting light source is incident,
The optical adjustment member is constituted by a sheet-like member coated with an ink member,
The surface emitting unit according to any one of claims 1 to 5, wherein the sheet-like member is disposed on the main surface of the light transmissive member. On the main surface of the light transmissive member, an application region where the ink member is applied and an unapplied region where the ink member is not applied are formed,
The surface emitting unit according to claim 6 or 7, wherein a chromaticity of light transmitted through the light transmissive member is adjusted by adjusting a ratio of the application region occupying the main surface.   9. The ink member is distributed in a gradation such that the density decreases in a dot shape or from a position corresponding to the central portion of the light emitting portion toward a position corresponding to the non-light emitting portion. The surface emitting unit described in 1.   The ink member includes at least a first ink member provided so as to cover a portion corresponding to the light emitting portion of the main surface of the light transmissive member, and a second ink provided on the first ink member. The surface emitting unit of Claim 6 or Claim 7 containing a member.   The second ink member is distributed in a dot shape or in a gradation so that the density decreases as it goes from a position corresponding to the central portion of the light emitting portion to a position corresponding to the non-light emitting portion. Item 11. The surface emitting unit according to Item 10.   The surface emitting unit according to any one of claims 6 to 11, wherein the ink member includes at least one of an ink member having a white color and an ink member having a light yellow color.   The surface emitting unit according to any one of claims 1 to 12, further comprising a diffusing member provided on a light emitting side of the optical adjustment member.   The surface emitting unit according to any one of claims 1 to 13, wherein the surface emitting light source and the light transmissive member are optically in close contact with each other facing each other.