JP7241271B2 - Light-emitting module and planar light source - Google Patents

Description

Embodiments of the present invention relate to light emitting modules and planar light sources.

2. Description of the Related Art A light-emitting module in which a light-emitting element such as a light-emitting diode and a light guide plate are combined is widely used as a planar light source such as a backlight of a liquid crystal display. Also proposed is a planar light source in which a light guide plate is partitioned into a plurality of regions by grooves, and light emission and non-light emission can be controlled for each region (for example, Patent Document 1, etc.).

JP 2018-101521 A

An object of the embodiments of the present invention is to provide a light-emitting module and a planar light source that can reduce a decrease in luminance that can occur between adjacent light guide portions partitioned by grooves in a light guide member.

According to one aspect of the present invention, a light emitting module includes a light source section including a first light source and a second light source, a first A main surface, and a first B main surface located on the opposite side of the first A main surface. , a first side surface located between the first A main surface and the first B main surface, and a first hole in which the first light source is arranged; a surface, a 2B main surface located on the opposite side of the 2A main surface, a second side surface located between the 2A main surface and the 2B main surface and facing the first side surface; a light guide member including a second light guide portion including a second hole portion in which the second light source is arranged; and a light reflecting member disposed between the first side surface and the second side surface. , provided. The first side includes a first A side and a first B side. The second side includes a second A side facing the first A side and a second B side facing the first B side. The light reflecting member includes a first light reflecting member arranged on the first B side and a second light reflecting member arranged on the second B side. An air layer is provided between the first light reflecting member and the second light reflecting member. The first A side and the second A side are exposed from the light reflecting member. The distance between the first A side and the second A side is shorter than the distance between the first B side and the second B side.

According to the embodiments of the present invention, it is possible to reduce the decrease in luminance that can occur between adjacent light guide portions partitioned by grooves in the light guide member.

1 is a schematic plan view of a planar light source according to a first embodiment of the invention; FIG. FIG. 2 is a schematic cross-sectional view taken along line II-II of FIG. 1; 1 is a schematic top view of a light source in a planar light source according to a first embodiment of the invention; FIG. 2 is a schematic bottom view of the light source in the planar light source of the first embodiment of the invention; FIG. FIG. 3B is a schematic cross-sectional view taken along line IIIC-IIIC of FIG. 3A; FIG. 3B is a schematic cross-sectional view taken along line IIID-IIID in FIG. 3A; It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 1st Embodiment of this invention. It is a schematic cross section of the planar light source of 2nd Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 2nd Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 2nd Embodiment of this invention. It is a schematic cross section of the planar light source of 3rd Embodiment of this invention. FIG. 24 is a schematic plan view of the B main surface side of the light guide section in the planar light source of FIG. 23; FIG. 24 is a schematic plan view of the B main surface side of the light guide section in the planar light source of FIG. 23; It is a schematic cross section which shows the manufacturing method of the planar light source of 3rd Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 3rd Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 3rd Embodiment of this invention. FIG. 4 is a schematic cross-sectional view showing an example of the cross-sectional shape of dividing grooves in the planar light source according to the embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing an example of the cross-sectional shape of dividing grooves in the planar light source according to the embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing an example of the cross-sectional shape of dividing grooves in the planar light source according to the embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing an example of the cross-sectional shape of dividing grooves in the planar light source according to the embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing an example of the cross-sectional shape of dividing grooves in the planar light source according to the embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing an example of the cross-sectional shape of dividing grooves in the planar light source according to the embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing an example of the cross-sectional shape of dividing grooves in the planar light source according to the embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing an example of the cross-sectional shape of dividing grooves in the planar light source according to the embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing an example of the cross-sectional shape of dividing grooves in the planar light source according to the embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing an example of the cross-sectional shape of dividing grooves in the planar light source according to the embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing an example of the cross-sectional shape of dividing grooves in the planar light source according to the embodiment of the present invention. It is a schematic cross section of the part in which the light source in the planar light source of 4th Embodiment of this invention is arrange|positioned. 1 is a schematic cross-sectional view showing an example of an outer peripheral portion of a planar light source according to an embodiment of the invention; FIG. 1 is a schematic cross-sectional view showing an example of an outer peripheral portion of a planar light source according to an embodiment of the invention; FIG. 1 is a schematic cross-sectional view showing an example of an outer peripheral portion of a planar light source according to an embodiment of the invention; FIG. 1 is a schematic cross-sectional view showing an example of an outer peripheral portion of a display device including a planar light source according to an embodiment of the invention; FIG. 1 is a schematic cross-sectional view of a display device including a planar light source according to an embodiment of the invention; FIG. It is a schematic plan view of the planar light source of 5th Embodiment of this invention. FIG. 33 is a schematic cross-sectional view taken along line XXXIII-XXXIII of FIG. 32; FIG. 11 is a schematic cross-sectional view showing dividing grooves in a planar light source according to a fifth embodiment of the present invention; FIG. 4 is a schematic cross-sectional view showing an example of the cross-sectional shape of dividing grooves in the planar light source according to the embodiment of the present invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 5th Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 5th Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 5th Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 5th Embodiment of this invention. It is a schematic cross section which shows the manufacturing method of the planar light source of 5th Embodiment of this invention. 1 is a schematic plan view showing an example of a display device including a planar light source according to an embodiment of the invention; FIG. FIG. 37 is a schematic cross-sectional view taken along line XXXVII-XXXVII of FIG. 36; FIG. 37 is a schematic plan view of the display device of FIG. 36 omitting the optical sheet and the liquid crystal panel; BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic plan view which shows an example of the planar light source of embodiment of this invention. It is a schematic plan view which shows an example of the planar light source of embodiment of this invention, and a holding member. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic cross section which shows an example of the display apparatus containing the planar light source of embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic cross section which shows an example of the display apparatus containing the planar light source of embodiment of this invention.

Hereinafter, embodiments will be described with reference to the drawings. Since each drawing schematically shows the embodiment, the scale, interval or positional relationship of each member may be exaggerated, illustration of a part of the member may be omitted, or an end face showing only a cut surface as a cross-sectional view. Figures may be used. In addition, the same code|symbol is attached|subjected to the same structure in each drawing.

[First embodiment]
FIG. 1 is a schematic plan view of a planar light source 300 according to the first embodiment of the invention. FIG. 1 shows a planar view of a light emitting surface of a planar light source 300. FIG. Two directions parallel to the light emitting surface of the planar light source 300 and perpendicular to each other are defined as the X direction and the Y direction. A direction orthogonal to the X direction and the Y direction is defined as the Z direction.

A planar light source 300 includes a light guide member 10 and a light source section 20 . The light guide member 10 has translucency with respect to the light emitted by the light source section 20 . The light source unit 20 includes at least a light emitting element as described later. The light emitted by the light source unit 20 includes at least the light emitted by the light emitting element. Further, for example, when the light source unit 20 contains a phosphor, the light emitted by the light source unit 20 also includes light emitted by the phosphor. For example, the transmittance of the light guide member 10 with respect to the light from the light source section 20 is preferably 80% or more, and more preferably 90% or more.

The light guide member 10 is partitioned into a plurality of light guide portions by partition grooves 14 . The dividing grooves 14 are grid-shaped in plan view, and divide the light guide member 10 so that at least one light source section 20 is included in one light guide section. FIG. 1 shows, for example, a planar light source 300 including four light guide sections partitioned into two rows and two columns along the X direction and the Y direction. Each light guide portion partitioned by the partition groove 14 can be used as a light emitting region 5 that serves as a drive unit for local dimming, for example. The number of light guide portions (light emitting regions 5) forming the planar light source 300 is not limited to the number shown in FIG.

FIG. 2 is a schematic cross-sectional view of any two adjacent light guide portions in the planar light source 300, and is a schematic cross-sectional view taken along line II-II in FIG.

One of the two adjacent light guide portions is a first light guide portion 10A, and the other is a second light guide portion 10B. The light source section 20 includes a first light source 20A arranged in the first light guide section 10A and a second light source 20B arranged in the second light guide section 10B. Hereinafter, the first light guide section 10A and the second light guide section 10B may be simply referred to as light guide sections 10A and 10B, and the first light source 20A and the second light source 20B may simply be referred to as light sources 20A and 20B. be.

As shown in FIG. 2, the planar light source 300 includes a light emitting module 100 and a support member 200. As shown in FIG. The light emitting module 100 includes at least a first light guide portion 10A, a second light guide portion 10B, a first light source 20A, and a second light source 20B.

As materials for the light guides 10A and 10B, for example, thermoplastic resins such as acrylic, polycarbonate, cyclic polyolefin, polyethylene terephthalate or polyester, thermosetting resins such as epoxy or silicone, or glass can be used.

The thickness of the light guide portions 10A and 10B is preferably 200 μm or more and 800 μm or less, for example. The light guide portions 10A and 10B may be composed of a single layer or a laminate of a plurality of layers in the thickness direction. When the light guide portions 10A and 10B are configured by a laminate, a translucent adhesive member may be arranged between each layer. Each layer of the laminate may use a different type of base material. As the material of the adhesive member, for example, thermoplastic resin such as acrylic, polycarbonate, cyclic polyolefin, polyethylene terephthalate or polyester, or thermosetting resin such as epoxy or silicone can be used.

The first light guide section 10A includes a first A main surface 11A that serves as a light emitting surface of the planar light source 300, and a first B main surface 11B located on the opposite side of the first A main surface 11A. The second light guide section 10B includes a second A main surface 12A that serves as a light emitting surface of the planar light source 300, and a second B main surface 12B located on the opposite side of the second A main surface 12A. Hereinafter, the first A main surface 11A and the second A main surface 12A may be simply referred to as A main surfaces 11A and 12A, and the first B main surface 11B and the second B main surface 12B may simply be referred to as B main surfaces 11B and 12B. Sometimes.

Further, the first light guide portion 10A includes a first hole portion 13A in which the first light source 20A is arranged. Second light guide portion 10B includes second hole portion 13B in which second light source 20B is arranged. The first hole portion 13A is a through hole penetrating from the first A main surface 11A to the first B main surface 11B. The second hole portion 13B is a through hole penetrating from the second A main surface 12A to the second B main surface 12B. Hereinafter, the first hole portion 13A and the second hole portion 13B may be simply referred to as the hole portions 13A and 13B.

As shown in FIG. 1, the holes 13A and 13B can be, for example, circular in plan view. Also, the holes 13A and 13B can be, for example, ellipses or polygons such as triangles, quadrilaterals, hexagons, and octagons in plan view.

As shown in FIG. 2, the first light guide section 10A includes a first side surface 15 positioned between the first A main surface 11A and the first B main surface 11B. The second light guide portion 10B includes a second side surface 16 positioned between the second A major surface 12A and the second B major surface 12B.

The first side 15 includes a first A side 15A and a first B side 15B. On one side of the second light guide portion 10B, the second side surface 16 includes a second A side surface 16A facing the first A side surface 15A and a second B side surface 16B facing the first B side surface 15B.

The first side surface 15 and the second side surface 16 define the dividing groove 14 . The dividing groove 14 includes a first groove portion 14a defined by the first B side surface 15B and the second B side surface 16B, and a second groove portion 14b defined by the first A side surface 15A and the second A side surface 16A. In this embodiment, the first groove portion 14a is partially defined by the first C side surface 15C and the second C side surface 16C. Further, the first groove portion 14a and the second groove portion 14b communicate with each other in the thickness direction of the light guide portions 10A and 10B.

More specifically, the first A side surface 15A is continuous with the first A main surface 11A, and the first B side surface 15B is continuous with the first B main surface 11B. A step is formed between the first A side 15A and the first B side 15B, and the first side 15 further includes a first C side 15C located between the first A side 15A and the first B side 15B. In other words, the first side surface 15 of the first light guide section 10A includes a first A side surface 15A closer to the second side surface 16 of the second light guide section 10B than a first B side surface 15B, and a first C side surface 15C. 1 convex portion 17 is provided. The first convex portion 17 is arranged on the first A main surface 11A side so that the surface opposite to the first C side surface 15C is flush with the first A main surface 11A. The surfaces of the first protrusion 17 opposite to the first C side surface 15C and the first C side surface 15C may be, for example, parallel surfaces or inclined surfaces to the first A major surface 11A.

Further, the second A side surface 16A is continuous with the second A main surface 12A, and the second B side surface 16B is continuous with the second B main surface 12B. A step is formed between the second A side 16A and the second B side 16B, and the second side 16 further includes a second C side 16C positioned between the second A side 16A and the second B side 16B. In other words, the second side surface 16 of the second light guide section 10B includes a second side surface 16A that is closer to the first side surface 15 of the first light guide section 10A than the second side surface 16B, and a second side surface 16C that includes a second side surface 16C. It has a convex portion 18 . The second convex portion 18 is arranged on the second A main surface 12A side so that the surface opposite to the second C side surface 16C is flush with the second A main surface 12A. The second C side surface 16C and the surface opposite to the second C side surface 16C may be, for example, parallel surfaces or inclined surfaces to the second A main surface 12A.

In this way, the first convex portion 17 including the surface flush with the first A main surface 11A and the second convex portion 18 including the surface flush with the second A main surface 12A are opposed to each other, for example When the first light guide portion 10A and the second light guide portion 10B are turned on at the same time, light propagates between the first convex portion 17 and the second convex portion 18 on the side of the A main surfaces 11A and 12A. Therefore, it is possible to reduce the decrease in luminance in the vicinity of the dividing grooves 14 .

The distance between the first A side surface 15A and the second A side surface 16A is shorter than the distance between the first B side surface 15B and the second B side surface 16B. The distance here represents the shortest distance between the first A side surface 15A and the second A side surface 16A and the shortest distance between the first B side surface 15B and the second B side surface 16B. That is, the width (minimum width) of the second groove portion 14b is smaller than the width (minimum width) of the first groove portion 14a.

The thickness direction of the first light guide portion 10A is the direction along the straight line connecting the first A main surface 11A and the first B main surface 11B at the shortest distance. In this embodiment, the first A main surface 11A and the first B main surface 11B are parallel to each other, and the direction perpendicular to the first A main surface 11A and the first B main surface 11B is the thickness of the first light guide section 10A. direction, and let it be the Z direction. Similarly, the thickness direction of the second light guide portion 10B is the direction along the shortest straight line connecting the second A main surface 12A and the second B main surface 12B. In this embodiment, the second A main surface 12A and the second B main surface 12B are parallel to each other, and the direction perpendicular to the second A main surface 12A and the second B main surface 12B is the thickness direction of the second light guide section 10B. and the Z direction. The length of the first B side surface 15B in the Z direction is longer than the length of the first A side surface 15A in the Z direction. The length of the second B side surface 16B in the Z direction is longer than the length of the second A side surface 16A in the Z direction. That is, the length in the depth direction of the dividing grooves 14 of the first groove portion 14a is longer than the length in the depth direction of the dividing grooves 14 of the second groove portion 14b.

20 A of 1st light sources are located in the 1B main surface 11B side of the 1st light guide part 10A. That is, the distance between the center of the first light source 20A in the thickness direction and the first B principal surface 11B is shorter than the distance between the center of the first light source 20A in the thickness direction and the first A principal surface 11A. The positions of the first A side surface 15A and the second groove portion 14b in the thickness direction of the first light guide portion 10A are above the upper surface of the first light source 20A.

The second light source 20B is positioned on the second B main surface 12B side of the second light guide section 10B. That is, the distance between the center of the second light source 20B in the thickness direction and the second B main surface 12B is shorter than the distance between the center of the second light source 20B in the thickness direction and the second A main surface 12A. The position of the second A side surface 16A in the thickness direction of the second light guide part 10B is above the upper surface of the second light source 20B.

A light reflecting member 40 is arranged between the first side surface 15 and the second side surface 16 . The light reflecting member 40 is arranged on at least one of the first B side surface 15B and the second B side surface 16B so that the first A side surface 15A and the second A side surface 16A are exposed. In the present embodiment, the light reflecting member 40 includes a first light reflecting member 40A arranged on the first B side surface 15B and a second light reflecting member separated from the first light reflecting member 40A and arranged on the second B side surface 16B. 40B. The first light reflecting member 40A is in contact with the first B side surface 15B and covers the first B side surface 15B. The second light reflecting member 40B is in contact with the second B side surface 16B and covers the second B side surface 16B.

No light reflecting member 40 is arranged on the first A side surface 15A and the second A side surface 16A. The first A side surface 15A and the second A side surface 16A face each other across the second groove portion 14b, and the inside of the second groove portion 14b is an air layer. Therefore, the 1st A side 15A and the 2nd A side 16A are in contact with the air. The first A side surface 15A and the second A side surface 16A are not covered with the light reflecting member 40 and are exposed from the light reflecting member 40 .

In the first groove portion 14a, there is an air layer between the first light reflecting member 40A arranged on the first B side surface 15B and the second light reflecting member 40B arranged on the second B side surface 16B. Therefore, the light reflecting member 40 (the first light reflecting member 40A and the second light reflecting member 40B) and the air layer are arranged between the first B side surface 15B and the second B side surface 16B. The light reflecting member 40 is in contact with air.

The first light reflecting member 40A is also arranged on the first C side surface 15C. The first light reflecting member 40A is arranged between the first B side surface 15B and the air layer and between the first C side surface 15C and the air layer. The first light reflecting member 40A is in contact with the first C side surface 15C and covers the first C side surface 15C.

The second light reflecting member 40B is also arranged on the second C side surface 16C. The second light reflecting member 40B is arranged between the second B side surface 16B and the air layer and between the second C side surface 16C and the air layer. The second light reflecting member 40B is in contact with the second C side surface 16C and covers the second C side surface 16C.

In the example shown in FIG. 2, the light reflecting members 40 are arranged on both the first B side surface 15B and the second B side surface 16B. Alternatively, the first light reflecting member 40A may be arranged on the first B side surface 15B and the second light reflecting member 40B may not be arranged on the second B side surface 16B. Conversely, the second light reflecting member 40B may be arranged on the second B side surface 16B and the first light reflecting member 40A may not be arranged on the first B side surface 15B. Alternatively, the inside of the first groove portion 14a may be filled with the light reflecting member 40 so as to be in contact with the first B side surface 15B and the second B side surface 16B.

As the light reflecting member 40 (the first light reflecting member 40A and the second light reflecting member 40B), for example, a resin member containing a light diffusing agent can be used. Light diffusing agents include, for example, particles of TiO ₂ . In addition, particles such as Nb ₂ O ₅ , BaTiO ₃ , Ta ₂ O ₅ , Zr ₂ O ₃ , ZnO, Y ₂ O ₃ , Al ₂ O ₃ , MgO, BaSO ₄ can be used as the light diffusing agent. Also, as the light reflecting member 40, for example, a metal member such as Al or Ag may be used.

The light emitting module 100 is arranged on the support member 200 with the first B main surface 11B and the second B main surface 12B opposed to the upper surface of the support member 200 . The upper surface of the support member 200 is exposed from the light guide portions 10A and 10B at the bottom of the dividing groove 14, for example.

20 A of 1st light sources are arrange|positioned on the support member 200 in the 1st hole 13A of the 1st light guide part 10A. The second light source 20B is arranged on the support member 200 inside the second hole portion 13B of the second light guide portion 10B. In addition, not only one light source 20A (20B) is arranged in one light guide part 10A (10B), but a plurality of light sources may be arranged.

FIG. 3A is a schematic top view of an example of light sources 20A and 20B. In FIG. 3A, the light emitting element 21 and the electrode 23 that are covered and hidden by the first light adjusting member 25, the first translucent member 22, and the like are indicated by dashed lines.
FIG. 3B is a schematic bottom view of one example of the light sources 20A and 20B.
FIG. 3C is a schematic cross-sectional view along line IIIC-IIIC of FIG. 3A.
FIG. 3D is a schematic cross-sectional view taken along line IIID-IIID in FIG. 3A. The first light source 20A and the second light source 20B have the same configuration.

The light sources 20A and 20B may be light-emitting elements alone, or may have a structure in which light-emitting elements are combined with, for example, translucent members. In this embodiment, as shown in FIGS. 3A to 3D, the light sources 20A and 20B include a light emitting element 21, a first translucent member 22, an electrode 23, a covering member 24, and a first light adjusting member 25. including. Also, the light sources 20A, 20B may include only one of the covering member 24 and the first light adjusting member 25 depending on the desired light distribution. For example, the first light adjusting member 25 may not be arranged on the first translucent member 22 , in other words, the upper surfaces of the light sources 20</b>A and 20</b>B may be configured on the upper surface of the first translucent member 22 . In addition, the covering member 24 is not placed under the first translucent member 22. In other words, the lower surfaces of the light sources 20A and 20B are configured by the lower surface of the first translucent member 22 and the lower surface of the light emitting element 21, respectively. be able to.

Light emitting element 21 includes a semiconductor laminate. The semiconductor laminate includes, for example, a support substrate such as sapphire or gallium nitride, an n-type semiconductor layer and a p-type semiconductor layer arranged on the support substrate, a light-emitting layer sandwiched between them, an n-type semiconductor layer and a p-type semiconductor layer. an n-side electrode and a p-side electrode respectively electrically connected to the semiconductor layer. Note that the semiconductor laminate from which the supporting substrate has been removed may be used. Further, the structure of the light emitting layer may be a structure having a single active layer such as a double hetero structure or a single quantum well structure (SQW), or a single active layer structure such as a multiple quantum well structure (MQW). A structure having layers may also be used. The light-emitting layer can emit visible light or ultraviolet light. The light-emitting layer can emit visible light from blue to red. A semiconductor laminate including such a light-emitting layer may include, for example, In _x Al _y Ga _1-xy N (0≦x, 0≦y, x+y≦1). The semiconductor laminate can include at least one light-emitting layer capable of emitting light as described above. For example, the semiconductor laminate may have a structure including one or more light-emitting layers between an n-type semiconductor layer and a p-type semiconductor layer, or may include an n-type semiconductor layer, a light-emitting layer, and a p-type semiconductor layer. Structures in order may be repeated multiple times. When the semiconductor laminate includes a plurality of light-emitting layers, it may include light-emitting layers with different emission peak wavelengths, or may include light-emitting layers with the same emission peak wavelength. It should be noted that the same emission peak wavelength may be, for example, a variation of about several nanometers. Such a combination of light-emitting layers can be appropriately selected. For example, when the semiconductor laminate includes two light-emitting layers, blue light and blue light, green light and green light, red light and red light, ultraviolet light The light-emitting layer can be selected with a combination of ultraviolet light, blue light and green light, blue light and red light, green light and red light, or the like. Moreover, the light-emitting layer may include a plurality of active layers with different emission peak wavelengths, or may include a plurality of active layers with the same emission peak wavelength.

The first translucent member 22 covers the top and side surfaces of the light emitting element 21 . As shown in FIG. 3D, the distance d1 from the side surface of the light emitting element 21 to the side surface of the first translucent member 22 is longer than the distance d2 from the top surface of the light emitting element 21 to the top surface of the first translucent member 22. You may This makes it easier for the light emitted from the side surface of the light emitting element 21 to propagate to the side surface side of the first translucent member 22 rather than the upper surface side, and the ratio of the light extracted from the side of the light sources 20A and 20B increases. . Therefore, the proportion of light incident on the light guide member 10 can be increased. Note that the distance d1 from the side surface of the light emitting element 21 to the side surface of the first translucent member 22 is 1.5 or more and 2.5 of the distance d2 from the top surface of the light emitting element 21 to the top surface of the first translucent member 22. The distance is preferably about twice or less, and more preferably, the distance d1 is about twice the distance d2. In addition, the first translucent member 22 protects the light emitting element 21 and has functions such as wavelength conversion and light diffusion depending on the particles added to the first translucent member 22 . Specifically, the first translucent member 22 contains a translucent resin and may further contain a phosphor. As translucent resin, for example, silicone resin or epoxy resin can be used. Further, as the phosphor, yttrium-aluminum-garnet-based phosphor (e.g., _Y3 (Al, Ga) _5O12 :Ce), lutetium-aluminum-garnet- _based phosphor (e.g., _Lu3 (Al, Ga) _5O12 :Ce), terbium-aluminum-garnet _{-based phosphors (e.g., Tb3(Al, Ga)5O12 : Ce )} , β-sialon-based phosphors (e.g., (Si, Al) ₃ (O, N ) ₄ :Eu), α-sialon-based phosphors (for example, Mz(Si,Al) ₁₂ (O,N) ₁₆ :Eu (where 0<z≦2, M is Li, Mg, Ca, Y, and lanthanide elements excluding La and Ce)), nitride phosphors such as CASN phosphors (e.g., CaAlSiN ₃ :Eu) or SCASN phosphors (e.g., (Sr, Ca)AlSiN ₃ :Eu), KSF phosphor (for example, K ₂ SiF ₆ :Mn), KSAF phosphor (for example, K ₂ (Si, Al)F ₆ :Mn), or MGF phosphor (for example, 3.5MgO·0.5MgF ₂ · GeO ₂ :Mn) and other fluoride-based phosphors, phosphors having a perovskite structure (e.g., CsPb(F, Cl, Br, I) ₃ ), or quantum dot phosphors (e.g., CdSe, InP, AgInS ₂ Alternatively, AgInSe ₂ ) or the like can be used. As the phosphor added to the first translucent member 22, one kind of phosphor may be used, or plural kinds of phosphors may be used.

The KSAF-based phosphor may have a composition represented by the following formula (I).
_{M2 [ SipAlqMnrFs ]} ( _I )

In formula (I), M represents an alkali metal and may contain at least K. Mn may be a tetravalent Mn ion. p, q, r and s may satisfy 0.9≤p+q+r≤1.1, 0<q≤0.1, 0<r≤0.2, 5.9≤s≤6.1. Preferably, 0.95≦p+q+r≦1.05 or 0.97≦p+q+r≦1.03, 0<q≦0.03, 0.002≦q≦0.02 or 0.003≦q≦0.015 , 0.005≦r≦0.15, 0.01≦r≦0.12 or 0.015≦r≦0.1, 5.92≦s≦6.05 or 5.95≦s≦6.025 can be For example, _{K2 [ Si0.946Al0.005Mn0.049F5.995 ] , K2} [ _{Si0.942Al0.008Mn0.050F5.992} ] _{, K2 [ Si0 . 939} Al _0.014 Mn _0.047 F _5.986 ]. With such a KSAF-based phosphor, it is possible to obtain red light emission with high brightness and a narrow half-value width of the emission peak wavelength.

Also, the wavelength conversion sheet containing the phosphor described above may be arranged on the planar light source. The wavelength conversion sheet can be used as a planar light source that absorbs part of the blue light from the light source, emits yellow light, green light and/or red light, and emits white light. For example, white light can be obtained by combining a light source capable of emitting blue light and a wavelength conversion sheet containing a phosphor capable of emitting yellow light. Alternatively, a light source capable of emitting blue light may be combined with a wavelength conversion sheet containing a red phosphor and a green phosphor. Also, a light source capable of emitting blue light may be combined with a plurality of wavelength conversion sheets. As the plurality of wavelength conversion sheets, for example, a wavelength conversion sheet containing a phosphor capable of emitting red light and a wavelength conversion sheet containing a phosphor capable of emitting green light can be selected. Also, a light source having a light emitting element capable of emitting blue light, a translucent member containing a phosphor capable of emitting red light, and a wavelength conversion sheet containing a phosphor capable of emitting green light are combined. may

The covering member 24 is arranged at least on the lower surface of the light emitting element 21 . The covering member 24 is arranged so that the lower surface (shown in FIG. 3B) of the electrode 23 connected to the p-side electrode and the n-side electrode of the light emitting element 21 is exposed from the covering member 24 . The covering member 24 is also arranged on the lower surface of the first translucent member 22 covering the side surface of the light emitting element 21 . The covering member 24 in this embodiment has a uniform thickness from the lower surface of the light emitting element 21 to the lower surface of the first translucent member 22 . Alternatively, the covering member 24 may be arranged, for example, so as to become thicker as it approaches the electrode 23 .

The covering member 24 has reflectivity with respect to the light emitted by the light sources 20A and 20B. The covering member 24 is, for example, a resin member containing a light diffusing agent. Specifically, the covering member 24 is silicone resin, epoxy resin, or acrylic resin containing a light diffusing agent made of particles such as TiO ₂ , SiO ₂ , Al ₂ O ₃ , ZnO, or glass.

The first light adjusting member 25 is arranged on the upper surface of the first translucent member 22 and controls the amount and direction of light emitted from the upper surface of the first translucent member 22 . The first light adjusting member 25 has reflectivity and translucency with respect to the light emitted by the light sources 20A and 20B. Part of the light emitted from the upper surface of the first translucent member 22 is reflected by the first light adjustment member 25 and the other part is transmitted through the first light adjustment member 25 . For example, the transmittance of the first light adjusting member 25 is preferably 1% or more and 50% or less, and more preferably 3% or more and 30% or less. As a result, the brightness directly above the light sources 20A and 20B is reduced, and the in-plane variation in the brightness of the planar light source 300 is reduced. The first light adjusting member 25 can be made of translucent resin and a light diffusing agent or the like contained in the translucent resin. Translucent resins are, for example, silicone resins, epoxy resins, or acrylic resins. Light diffusing agents include particles such as TiO ₂ , SiO ₂ , Al ₂ O ₃ , ZnO, or glass. The first light adjustment member 25 may be, for example, a metal member such as Al or Ag, or a dielectric multilayer film.

As shown in FIG. 2, the light emitting module 100 can further include a second translucent member 71, a wavelength converting member 72, a third translucent member 73, and a second light adjusting member 74. .

The second translucent member 71, the wavelength conversion member 72, and the third translucent member 73 are arranged in the holes 13A, 13B of the light guides 10A, 10B, respectively.

The second translucent member 71 and the third translucent member 73 have translucency with respect to the light emitted by the light sources 20A and 20B. A resin having a small difference in refractive index from the materials of 10A and 10B can be used.

The second translucent member 71 is arranged between the side surfaces of the light sources 20A and 20B and the side surfaces of the holes 13A and 13B. The second transparent member 71 and the side surfaces of the light sources 20A and 20B and the second transparent member 71 and the side surfaces of the holes 13A and 13B and the second transparent member 71 do not form spaces such as air layers. 2 It is preferable to dispose the translucent member 71 . Thereby, the light from the light sources 20A and 20B can be easily guided to the light guide portions 10A and 10B.

The wavelength conversion member 72 covers the upper surfaces of the light sources 20A and 20B. The wavelength conversion member 72 also covers the upper surface of the second translucent member 71 . The wavelength conversion member 72 is a translucent resin member containing phosphors for color adjustment of the light sources 20A and 20B.

The third translucent member 73 covers the upper surface of the wavelength conversion member 72 . The upper surface of the third translucent member 73 can be a flat surface. Alternatively, the upper surface of the third translucent member 73 can be a concave or convex curved surface.

The second light adjusting member 74 is arranged on the third translucent member 73 . The second light adjusting member 74 has reflectivity and translucency with respect to the light emitted by the light sources 20A and 20B. The second light adjusting member 74 can be made of translucent resin and a light diffusing agent or the like contained in the translucent resin. Translucent resins are, for example, silicone resins, epoxy resins, or acrylic resins. Light diffusing agents include particles such as TiO ₂ , SiO ₂ , Al ₂ O ₃ , ZnO, or glass. The second light adjusting member 74 can be arranged to cover all or part of the upper surface of the third translucent member 73 . In addition, the second light adjusting member 74 can be extended over the upper surface of the third translucent member 73 and the A main surfaces 11A and 12A of the surrounding light guide portions 10A and 10B.

As shown in FIG. 1, the second light adjustment member 74 is arranged at a position overlapping the light sources 20A and 20B in plan view. In the example shown in FIG. 1, the second light adjustment member 74 has a rectangular shape that is larger than the rectangular light sources 20A and 20B in plan view. The second light adjustment member 74 can be circular, triangular, hexagonal, octagonal, or the like in plan view.

The first light adjustment member 25 reflects part of the light emitted directly above the light sources 20A and 20B and transmits the other part. As a result, on the A main surfaces 11A and 12A, which are the light emitting surfaces (light emitting surfaces) of the planar light source 300, the luminance in the areas immediately above the light sources 20A and 20B is prevented from being extremely higher than the luminance in other areas. can. That is, it is possible to reduce uneven brightness of light emitted from the light guide portions 10A and 10B partitioned by the partition grooves 14 .

The thickness of the second light adjusting member 74 is preferably 0.005 mm or more and 0.2 mm or less, more preferably 0.01 mm or more and 0.075 mm or less. Moreover, the reflectance of the second light adjustment member 74 is preferably set lower than the reflectance of the first light adjustment member 25, and is, for example, 20% or more and 90% or less with respect to the light from the light sources 20A and 20B. is preferred, and more preferably 30% or more and 85% or less.

A third translucent member 73 is arranged between the second light adjusting member 74 and the first light adjusting member 25 . The third translucent member 73 has a higher transmittance with respect to the light emitted by the light sources 20A and 20B than the first light adjusting member 25 and the second light adjusting member 74 do. The transmittance of the third translucent member 73 with respect to the light emitted by the light sources 20A and 20B is at least twice the transmittance of the first light adjustment member 25 and the transmittance of the second light adjustment member 74 within the range of 100% or less. It can be 100 times or less. As a result, the regions immediately above the light sources 20A and 20B are neither too bright nor too dark, and as a result, uneven luminance within the light emitting surfaces of the light guide portions 10A and 10B can be reduced.

A single layer of the second translucent member 71 may be arranged without arranging the wavelength converting member 72 and the third translucent member 73 in the holes 13A and 13B. In this case, the second light adjusting member 74 is arranged on the second translucent member 71 . Alternatively, the second translucent member 71 itself may contain a phosphor to function as a wavelength conversion member.

The support member 200 includes a wiring board 50 , a first adhesive member 41 , a third light reflecting member 42 and a second adhesive member 43 . A first adhesive member 41 , a third light reflecting member 42 , and a second adhesive member 43 are arranged in this order on the wiring substrate 50 .

The first bonding member 41 is arranged between the wiring substrate 50 and the third light reflecting member 42 and bonds the wiring substrate 50 and the third light reflecting member 42 together. The second adhesive member 43 is arranged between the third light reflecting member 42 and the B main surfaces 11B and 12B of the light guide portions 10A and 10B to separate the third light reflecting member 42 and the light guide portions 10A and 10B. It's glued.

The first light source 20A is arranged on the second adhesive member 43 inside the first hole 13A. The second light source 20B is arranged on the second adhesive member 43 inside the second hole 13B.

The second adhesive member 43 has translucency to the light emitted by the light sources 20A and 20B. The first adhesive member 41 and the second adhesive member 43 are made of, for example, epoxy resin, acrylic resin, or cyclic polyolefin resin.

The third light reflecting member 42 is arranged below the B main surfaces 11B and 12B of the light guides 10A and 10B, below the light sources 20A and 20B, and below the dividing groove 14 . That is, the third light reflecting member 42 is arranged over the entire lower surface of the light emitting module 100 .

The third light reflecting member 42 has reflectivity with respect to light emitted by the light sources 20A and 20B. For the third light reflecting member 42, for example, a resin member containing many air bubbles or a resin member containing a light diffusing agent can be used. The material of the resin member is, for example, polyethylene terephthalate (PET) resin, cyclic polyolefin resin, acrylic resin, silicone resin, urethane resin, epoxy resin, or the like. Examples _of light diffusing _agents include _{SiO2 , CaF2} , MgF2, _TiO2 , _{Nb2O5 , BaTiO3} , _{Ta2O5 , Zr2O3} , ZnO, _Y2O2 , _{Al2O3 ,} MgO or _BaSO4 or the like can be used.

The wiring board 50 includes an insulating base material and at least one wiring layer. A connecting portion 51a, which is a part of the wiring layer, is arranged on the back surface of the wiring board 50 opposite to the surface on which the first adhesive member 41 is arranged. Also, the back surface of the wiring board 50 is covered with an insulating film 52 . The connecting portion 51 a is exposed from the insulating film 52 without being covered with the insulating film 52 .

In the support member 200, a connection member 61 is arranged below the light sources 20A and 20B. At least part of the electrodes 23 of the light sources 20A and 20B are arranged on the connection member 61 and connected to the connection member 61 .

The connecting member 61 penetrates between the second adhesive member 43 and the insulating film 52 , and further extends from the penetrating portion to the connecting portion 51 a arranged on the back surface of the wiring substrate 50 . The connection member 61 has conductivity and electrically connects the electrodes 23 of the light sources 20A and 20B and the connection portion 51a. The connection member 61 is, for example, a conductive paste in which a conductive filler is dispersed in a binder resin. The connection member 61 can contain, for example, metal such as copper or silver as a filler. The filler is particulate or flaky.

Each light source 20A, 20B includes a pair of positive and negative electrodes 23 . The connection member 61 connected to the positive electrode 23 and the connection member 61 connected to the negative electrode 23 are separated and not electrically connected. An insulating film 53 is arranged on the surface of the insulating film 52 so as to cover the connection member 61 . The insulating film 53 is formed so as to cover between the pair of connection members 61 corresponding to the pair of positive and negative electrodes 23 and enhances the insulation between the pair of positive and negative connection members 61 .

In the planar light source 300 of the embodiment configured as described above, the light guided through the light guide portions 10A and 10B and directed toward the B main surfaces 11B and 12B is It is possible to improve the brightness of the light that is reflected toward the A main surfaces 11A and 12A, which are the light emitting surfaces of the planar light source 300, and extracted from the A main surfaces 11A and 12A.

In the region between the third light reflecting member 42 and the A main surfaces 11A and 12A, the light from the light sources 20A and 20B is repeatedly reflected by the third light reflecting member 42 and the A main surfaces 11A and 12A. are guided through the light guide portions 10A and 10B toward the dividing grooves 14. As shown in FIG. A part of the light directed to the A main surfaces 11A and 12A is taken out from the A main surfaces 11A and 12A to the outside of the light guide portions 10A and 10B.

The light reflecting members 40 arranged on the first side surface 15 and the second side surface 16 forming the side surfaces of the dividing groove 14 suppress the propagation of light between the adjacent light guide portions 10A and 10B. For example, propagation of light from the light-emitting light guide section 10A (or 10B) to the non-light-emitting light guide section 10B (or 10A) is suppressed. As a result, local dimming can be performed using the light guide portions 10A and 10B partitioned by the partition grooves 14 as driving units.

In this embodiment, since the light reflecting member 40 contains a light diffusing agent, the light reaching the light reflecting member 40 from the light sources 20A and 20B is diffusely reflected, and the light is extracted upward. Therefore, it is possible to improve the brightness in the vicinity of the first side surface 15 and the second side surface 16 far from the light sources 20A and 20B.

In particular, the light reflecting members 40 arranged on the first C side surface 15C and the second C side surface 16C are positioned closer to the A main surfaces 11A and 12A than the B main surfaces 11B and 12B so as to face the A main surfaces 11A and 12A. Therefore, the amount of light emitted upward can be increased by the light reflection members 40 arranged on the first C side surface 15C and the second C side surface 16C.

The first side surface 15 has a first A side surface 15A on which the light reflecting member 40 is not arranged, and the second side surface 16 has a second A side surface 16A on which the light reflecting member 40 is not arranged. Therefore, when both the first light guide portion 10A and the second light guide portion 10B are turned on at the same time, the light can be propagated between the first A side surface 15A and the second A side surface 16A. A dark portion (dark line) at the boundary (dividing groove 14) between the light section 10A and the second light guide section 10B can be suppressed. Since the distance between the first A side surface 15A and the second A side surface 16A is shorter than the distance between the first B side surface 15B and the second B side surface 16B, light can easily propagate between the first A side surface 15A and the second A side surface 16A.

According to the present embodiment, the division by the division groove 14 is determined by the cross-sectional shape of the division groove 14, the distribution ratio between the portion where the light reflection member 40 is arranged and the portion where the light reflection member 40 is not arranged, etc. on the first side surface 15 and the second side surface 16. In addition, it is possible to adjust the amount of light propagating between the adjacent light guides 10A and 10B, and reduce the decrease in brightness that may occur between the light guides 10A and 10B.

For example, in the Z direction, the length of the 1B side surface 15B on which the first light reflecting member 40A is arranged is made longer than the length of the 1A side surface 15A. Furthermore, in the Z direction, the length of the second B side surface 16B on which the second light reflecting member 40B is arranged is made longer than the length of the second A side surface 16A. This can enhance the effect of suppressing the propagation of light from the light-emitting light guide section 10A (or 10B) to the non-light-emitting light guide section 10B (or 10A).

Next, a method for manufacturing the planar light source 300 will be described with reference to FIGS. 4 to 20. FIG.

The manufacturing method of the planar light source 300 of the embodiment has a step of preparing the structure 101 shown in FIG. The step of preparing structure 101 includes the step of preparing light guide plate 110 shown in FIG. The light guide plate 110 includes a first major surface 110A and a second major surface 110B opposite the first major surface 110A. Alternatively, the structure 101 shown in FIG. 8 may be purchased and prepared.

As shown in FIG. 5, the light guide plate 110 is formed with a first hole portion 13A and a second hole portion 13B. The first hole portion 13A and the second hole portion 13B are formed as through holes penetrating the light guide plate 110 by, for example, drilling, punching, or laser processing.

As shown in FIG. 6, the light guide plate 110 is further formed with a first groove portion 14a. The first groove portion 14a is formed as a bottomed groove that opens toward the second main surface 110B. The depth of the first groove portion 14a is greater than the distance between the bottom surface of the first groove portion 14a and the first main surface 110A. The first groove portion 14a is formed by, for example, cutting or laser processing.

As shown in FIG. 7, light reflecting members 40 are formed on the bottom and side surfaces of the first groove portion 14a. The light reflecting member 40 is formed by, for example, printing, potting, spraying, or the like. The light reflecting member 40 in this embodiment does not fill the inside of the first groove portion 14a, and a space is left inside the light reflecting member 40 inside the first groove portion 14a.

As shown in FIG. 8, the structure 101 is obtained by cutting the light guide plate 110 into a desired planar size.

The manufacturing method of the planar light source 300 of this embodiment has a step of preparing the support member 200 shown in FIG. The step of preparing the support member 200 includes the step of preparing the wiring board 50 shown in FIG. A connection portion 51 a and an insulating film 52 are arranged on the back surface of the wiring substrate 50 . The connecting portion 51 a is arranged in an opening formed in the insulating film 52 and exposed from the insulating film 52 . Alternatively, the support member 200 shown in FIG. 11 may be purchased and prepared.

As shown in FIG. 10, the first adhesive member 41, the third light reflecting member 42, and the second adhesive member 43 are laminated on the surface of the wiring board 50 opposite to the surface on which the connecting portion 51a is arranged. .

As shown in FIG. 11, connection holes 201 are formed through the second adhesive member 43, the third light reflecting member 42, the first adhesive member 41, the wiring substrate 50, and the insulating film 52, and the supporting member 200 is obtained. . The connection hole 201 is formed by punching, drilling, or laser processing, for example. The shape of the connection hole 201 in plan view is circular. The shape of the connection hole 201 in plan view may be an elliptical shape or a polygonal shape other than the circular shape. Of the pair of positive and negative electrodes 23 in the light sources 20A and 20B, one connection hole 201 faces one electrode (for example, the positive electrode) and one connection hole 201 faces the other electrode (for example, the negative electrode). are placed facing each other. At this time, the size of one connection hole 201 in plan view may be such that at least part of the lower surface of one electrode 23 is exposed from the wiring board 50 . In other words, one electrode 23 overlaps one connection hole 201 in plan view.

As shown in FIG. 12, the structure 101 is placed on the support member 200 . A second main surface 110B of the light guide plate 110 is adhered to the second adhesive member 43 of the support member 200 . A connection hole 201 formed in the support member 200 is arranged so as to overlap and communicate with the first hole portion 13A and the second hole portion 13B formed in the light guide plate 110 . Two connection holes 201 overlap one first hole portion 13A, and two connection holes 201 overlap one second hole portion 13B. The opening of the first groove portion 14 a faces the second adhesive member 43 forming the upper surface of the support member 200 . The first groove portion 14a is positioned between the first main surface 110A of the light guide plate 110 and the upper surface of the support member 200. As shown in FIG.

After arranging the structure 101 on the support member 200, the portion of the light guide plate 110 that is connected above the first groove portion 14a is cut. At this time, the portion of the light reflecting member 40 that is connected within the first groove portion 14a is also cut. For example, the light guide plate 110 and the light reflecting member 40 are cut using a cutting tool such as a pull-cut or push-cut cutter, or a laser. When cutting the light guide plate 110 and the light reflecting member 40 in this manner, the support member 200 may not be cut as in the present embodiment, or a portion of the support member 200 may be cut. When part of the support member 200 is cut, a groove extending along the first groove 14a in plan view (hereinafter referred to as a third groove) is arranged on the upper surface of the support member 200 . This third groove suppresses warpage of the support member 200 caused by heat treatment (for example, heat treatment performed after the structure 101 is placed on the support member 200) due to the difference in the thermal expansion coefficient of each member constituting the support member 200. Thus, the occurrence of cracks in the connection member 61 can be suppressed. Note that cutting a part of the supporting member 200 means cutting to an arbitrary depth that does not cut the wiring layer of the wiring board 50 included in the supporting member 200 . More specifically, at least part of the second adhesive member 43 is cut. Alternatively, the second adhesive member 43 and at least part of the third light reflecting member 42 may be cut. Alternatively, the second adhesive member 43, the third light reflecting member 42, and at least part of the first adhesive member 41 may be cut. In other words, the depth of the third groove can be appropriately set to a depth at which the first adhesive member 41, the third light reflecting member 42, or the second adhesive member 43 becomes the bottom surface of the third groove.

In the present embodiment, as shown in FIG. 13, a second groove portion 14b is formed above the first groove portion 14a and communicates with the first groove portion 14a, and a partitioned portion composed of the first groove portion 14a and the second groove portion 14b is formed. A groove 14 is formed. The light guide plate 110 is separated into the first light guide portion 10A and the second light guide portion 10B by the dividing grooves 14 .

Due to the difference in coefficient of thermal expansion between the light guide plate 110 and the wiring substrate 50 , there is a possibility that the light guide plate 110 will warp due to heat treatment performed after the structure 101 is arranged on the support member 200 . According to the present embodiment, by completely separating the light guide plate 110 into the plurality of light guide portions 10A and 10B, compared to the case where the light guide plate 110 is connected at the division grooves 14, the heat generated by the subsequent heat treatment is reduced. warping can be suppressed.

5, the light guide plate 110 is placed on the support member 200, and when the dividing grooves 14 are formed in the light guide plate 110 supported by the support member 200, the thickness of the support member 200 There is a risk that the wiring layer of the wiring board 50 may be cut due to variations in the thickness. According to this embodiment, after the light guide plate 110 in which the first grooves 14a are formed in advance is placed on the support member 200, the portion of the light guide plate 110 that is connected above the first grooves 14a is cut. The wiring layer of the wiring substrate 50 is less likely to be cut when forming the first groove portion 14a and the second groove portion 14b.

In addition, if the light guide plate 110 is separated into the plurality of light guide portions 10A and 10B by the dividing grooves 14 before the light guide plate 110 is arranged on the support member 200, the separated individual light guide portions 10A and 10B are placed on the support member 200. FIG.

In contrast, according to the present embodiment, when the light guide plate 110 is arranged on the support member 200, the light guide plate 110 is not separated into pieces but is in a connected state. , 10B are collectively arranged on the support member 200, so that the number of steps can be reduced.

After separating the light guide plate 110 into a plurality of light guide portions 10A and 10B, the light sources 20A and 20B are arranged in the holes 13A and 13B as shown in FIG. For example, the lower surface of the covering member 24, which is the lower surface of the light sources 20A and 20B, is adhered to the upper surface of the second adhesive member 43 exposed in the holes 13A and 13B. Electrodes 23 of light sources 20A and 20B are positioned in connection holes 201 formed in support member 200 . At least part of the lower surface of the electrode 23 is exposed from the support member 200 through the connection hole 201 .

After arranging the light sources 20A and 20B in the holes 13A and 13B, as shown in FIG. 15, the second translucent members 71 are formed in the holes 13A and 13B. The second translucent member 71 is formed between the side surfaces of the light sources 20A and 20B and the side surfaces of the holes 13A and 13B. The top surfaces of the light sources 20A and 20B are exposed through the second translucent member 71 . For example, the second translucent member 71 is formed by supplying a liquid translucent resin into the holes 13A and 13B and then curing it by heating. The light sources 20A and 20B are fixed to the light guide sections 10A and 10B by the second translucent member 71 .

After forming the second translucent member 71 , the connection member 61 is formed in the connection hole 201 . For example, a conductive paste is supplied into the connection holes 201 and then thermally cured to form connection members 61 connected to the electrodes 23 of the light sources 20A and 20B, as shown in FIG. The connection member 61 is also formed on the back surface of the wiring board 50 and connected to the connection portion 51a of the wiring layer.

When hardening the conductive paste, it is preferable to harden while applying pressure. By doing so, it is possible to suppress the formation of air bubbles in the connection member 61 . For example, when the conductive paste is supplied into the connection hole 201, air bubbles that have entered the conductive paste can be released to the outside of the conductive paste by curing the conductive paste while pressurizing it. By suppressing the formation of air bubbles in the connection member 61, the reliability of the connection member 61 in electrical connection is improved. Further, air bubbles located between the first adhesive member, the second adhesive member and/or the third light reflecting member and the conductive paste can be released through the conductive paste by curing the conductive paste while pressurizing it. can. Thereby, the adhesion between the connection member 61 and the first adhesive member, the second adhesive member and/or the third light reflecting member can be improved. If the first adhesive member and/or the second adhesive member contain air bubbles before the conductive paste is cured, the air bubbles are released through the conductive paste by curing the conductive paste while applying pressure. be able to. This makes it easier to improve the adhesive strength of the first adhesive member and/or the second adhesive member. When the conductive paste contains metal particles and resin, the volume of the resin can be reduced by curing the conductive paste while applying pressure. As a result, the volume ratio of the metal particles to the connection member 61 can be increased, so that the reliability of the connection member 61 in electrical connection is improved. In general, the volume of metal particles is less likely to change under pressure than resin. A depression may be formed in the surface of the connection member 61 located on the opposite side of the light guide member by reducing the volume of the resin contained in the conductive paste. The temperature for curing the conductive paste is not particularly limited. The temperature for curing the conductive paste is preferably 40° C. or higher and 130° C. or lower, for example. The pressure when curing the conductive paste is not particularly limited. The pressure when curing the conductive paste is preferably 0.15 MPa or more and 1 MPa or less, for example. The conductive paste preferably contains an organic solvent. When the conductive paste is cured, the volatilized organic solvent makes it easier for air bubbles in the conductive paste to come out of the conductive paste. The amount of solvent contained in the conductive paste is not particularly limited. The amount of solvent contained in the conductive paste is preferably 0.1 wt % or more and 10 wt % or less, for example. The material of the organic solvent contained in the conductive paste is not particularly limited. Organic solvent materials contained in the conductive paste may be known materials such as methanol, ethanol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, cyclopentanone, cyclohexanone, and γ-butyrolactone. can be done.

After forming the connection member 61, as shown in FIG. 17, the wavelength conversion member 72 is formed on the light sources 20A and 20B and the second translucent member 71 in the holes 13A and 13B. For example, the wavelength conversion member 72 is formed by supplying a liquid resin containing a phosphor into the holes 13A and 13B and then thermally curing the resin.

After forming the wavelength conversion member 72, as shown in FIG. 18, a third translucent member 73 is formed on the wavelength conversion member 72 in the holes 13A and 13B. For example, the third translucent member 73 is formed by supplying a liquid resin onto the wavelength conversion member 72 and then thermally curing it.

After forming the third translucent member 73, a second light adjusting member 74 is formed on the third translucent member 73, as shown in FIG. For example, the second light adjusting member 74 is formed by supplying a liquid resin containing a light diffusing agent onto the third translucent member 73 and then thermally curing the resin.

When forming each of the second translucent member 71, the connection member 61, the wavelength converting member 72, the third translucent member 73, and the second light adjusting member 74, the light guide portions 10A and 10B are divided into dividing grooves. Since they are separated by 14, warping of the light guide portions 10A and 10B due to heat treatment can be suppressed.

After forming the second light adjusting member 74, as shown in FIG. The insulating film 53 is formed by, for example, printing, potting, spraying, ink jetting, bonding of resin sheets, or the like. Thereafter, the support member 200 is cut into a desired planar size to obtain the planar light source 300 shown in FIG.

[Second embodiment]
FIG. 21 is a schematic cross-sectional view of a planar light source according to the second embodiment of the invention.

In addition, the first light guide portion 10A, the first A main surface 11A, the first B main surface 11B, the first side surface 15, the first A side surface 15A, the first B side surface 15B, the first C side surface 15C, and the first light reflecting member shown in FIG. 40A, the first hole portion 13A, and the first light source 20A are respectively the second light guide portion 10B, the second A main surface 12A, the second B main surface 12B, the second side surface 16, the second A side surface 16A, and the second B side surface 16B. , the second C side surface 16C, the second light reflecting member 40B, the second hole 13B, and the second light source 20B.

Also in the second embodiment, the configuration of the first side surface 15 of the first light guide section 10A and the second side surface 16 of the second light guide section 10B are the same as in the first embodiment, It is possible to reduce a decrease in luminance that may occur between the light guide portions 10A and 10B that match.

Furthermore, in the second embodiment, the first light reflecting member 40A arranged on the 1B side surface 15B of the first light guide section 10A is also arranged to extend to the 1B main surface 11B. Similarly, the second light reflecting member 40B arranged on the 2B side surface 16B of the second light guide section 10B is also arranged to extend to the 2B main surface 12B. By disposing the first light reflecting member 40A and the second light reflecting member 40B on the third light reflecting member 42, the light propagating through the first light guide portion 10A and the second light guide portion 10B is It can be suppressed to reach 200 and be absorbed.

22A and 22B are schematic cross-sectional views showing the manufacturing method of the planar light source of the second embodiment.

After forming the first groove portion 14a in the light guide plate 110, as shown in FIG. It is formed by a method such as spraying.

After that, as shown in FIG. 22B, the light guide plate 110 is formed with the first holes 13A. The light reflecting member 40 formed at the position where the first hole 13A is formed on the second main surface 110B is removed.

After that, the light reflecting member 40 arranged on the second main surface 110B is adhered to the second adhesive member 43 of the supporting member 200, and the light guide plate 110 is arranged on the supporting member 200. FIG. After that, the steps after FIG. 13 are continued.

According to the second embodiment, the process can be simplified compared to the process of selectively forming the light reflecting member 40 only in the first groove portion 14a.

[Third embodiment]
FIG. 23 is a schematic cross-sectional view of a planar light source according to the third embodiment of the invention.
24A and 24B are schematic plan views of the 1B main surface 11B side of the first light guide portion 10A in the planar light source of FIG.

Also in the third embodiment, the configuration of the first side surface 15 of the first light guide section 10A and the second side surface 16 of the second light guide section 10B are the same as in the first embodiment, It is possible to reduce a decrease in luminance that may occur between the light guide portions 10A and 10B that match.

In the third embodiment, the first light reflecting member 40A arranged on the first B main surface 11B is provided with a first opening 81 in which the first light reflecting member 40A is not arranged around the first light source 20A on the first B main surface 11B. is formed, which is different from the second embodiment. Similarly, in the second light guide section 10B, the second light reflecting member 40B is arranged on the second B main surface 12B, and the second light reflecting member 40B is not arranged around the second light source 20B on the second B main surface 12B. A second opening 81 is formed.

In FIGS. 24A and 24B, the first light reflecting member 40A is represented by dotted hatching. The planar shape of the first opening 81 is, for example, circular as shown in FIG. 24A. Alternatively, the planar shape of the first opening 81 is, for example, a square as shown in FIG. 24B. The planar shape of the first opening 81 may be, for example, an elliptical shape or a rectangular shape other than a square shape. The first light source 20A and the first hole 13A are positioned inside the first opening 81 in a plan view of the 1B main surface 11B of the first light guide portion 10A.

According to the third embodiment, in the peripheral region of the first light source 20A, the light traveling toward the first B main surface 11B can reach the third light reflecting member 42 through the first opening 81. FIG. For example, the diffuse reflectance of the first light reflecting member 40A for the light emitted by the first light source 20A is higher than the diffuse reflectance of the third light reflecting member 42 for the light emitted by the first light source 20A. The mirror reflectance of the third light reflecting member 42 with respect to the light emitted from the first light source 20A is higher than the mirror reflectance of the first light reflecting member 40A with respect to the light emitted from the first light source 20A. In such a case, the light reaching the third light reflecting member 42 is totally reflected by the third light reflecting member 42 and guided through the first light guide section 10A.

The area around the first light source 20A has a higher brightness than other areas, and conversely, the area near the first side surface 15 far from the first light source 20A and the corner tends to have a lower brightness. According to the third embodiment, the light from the first light source 20A reaches the first side surface 15 and corners by not arranging the first light reflecting member 40A having a high diffuse reflectance in the peripheral region of the first light source 20A. Therefore, it is possible to suppress being taken out to the outside from the first A main surface 11A before the first A main surface 11A. In addition, by arranging the third light reflecting member 42 having a high specular reflectance in the peripheral area of the first light source 20A, the light from the first light source 20A is directed through the first light guide portion 10A to the first side surface 15 and corner portions. The light can be easily guided toward. As a result, luminance unevenness within the light emitting surface can be improved.

25A to 25C are schematic cross-sectional views showing the manufacturing method of the planar light source of the third embodiment.

After forming the first groove portion 14a and the first hole portion 13A in the light guide plate 110, as shown in FIG. 25A, a jig 90 is inserted into the first hole portion 13A. A part 90a of the jig 90 is located outside the first hole 13A and covers the second main surface 110B around the first hole 13A.

In this state, as shown in FIG. 25B, the light reflecting member 40 is formed on the bottom and side surfaces of the first groove portion 14a and the second main surface 110B not covered with the jig 90. Next, as shown in FIG. The light reflecting member 40 is also formed on the top surface of the jig 90 .

Then, by removing the jig 90 from the first hole portion 13A, as shown in FIG. 25C, the first opening portion 81 in which the light reflecting member 40 is not arranged in the peripheral region of the first hole portion 13A in the second main surface 110B. is obtained.

After that, the light reflecting member 40 arranged on the second main surface 110B is adhered to the second adhesive member 43 of the supporting member 200, and the light guide plate 110 is arranged on the supporting member 200. FIG. After that, the steps after FIG. 13 are continued.

26A to 26K are schematic cross-sectional views showing examples of the cross-sectional shape of the dividing groove 14 in the planar light source of each embodiment.

In the example shown in FIGS. 26A-26F, the first B side 15B and the second B side 16B are perpendicular to the main surfaces 11A, 11B, 12A, 12B of the light guides 10A, 10B. In the example shown in FIGS. 26A-26D, the first C-side surface 15C and the second C-side surface 16C are parallel to the main surfaces 11A, 11B, 12A, 12B.

In the example shown in FIG. 26A, the first A side surface 15A and the second A side surface 16A are inclined with respect to the main surfaces 11A, 11B, 12A, 12B. The first A main surface 11A and the first A side surface 15A form an obtuse angle and are continuous. The 2A main surface 12A and the 2A side surface 16A form an obtuse angle and are continuous. The width of the second groove portion 14b gradually narrows from the A main surfaces 11A and 12A toward the B main surfaces 11B and 12B, and the light emitted from the first A side surface 15A and the second A side surface 16A are directed upward. Since the light is refracted and extracted to the outside, it is possible to reduce the decrease in brightness near the dividing grooves 14 .

As shown in FIG. 26B, the first A side 15A and the second A side 16A can also be perpendicular to the major surfaces 11A, 11B, 12A, 12B. Thereby, light can be easily propagated between the first A side surface 15A and the second A side surface 16A.

In the example shown in FIG. 26C, the 1A main surface 11A and the 1A side surface 15A form an acute angle and are continuous. The second A main surface 12A and the second A side surface 16A form an acute angle and are continuous. The width of the second groove portion 14b gradually widens from the A main surfaces 11A and 12A toward the B main surfaces 11B and 12B, and the light incident from the first A side surface 15A and the second A side surface 16A is It can be made easy to propagate in the direction parallel to the main surfaces 11A and 12A.

In the example shown in FIG. 26D, the corner between the first A main surface 11A and the first A side surface 15A has a curved surface. A corner portion between the second A main surface 12A and the second A side surface 16A also has a curved surface. This makes it easier for light to be taken out from the corners, and reduces the decrease in luminance near the dividing grooves 14 .

In the example shown in FIG. 26E, the first C side surface 15C and the second C side surface 16C are inclined with respect to the main surfaces 11A, 11B, 12A, 12B. As a result, part of the light that propagates in the light guide portion 10A and travels to the first A side surface 15A and part of the light that propagates in the light guide portion 10B and travels to the second A side surface 16A are directed to the second groove portion 14b. Since the light can be reflected in the approaching direction, it is possible to reduce the decrease in brightness in the vicinity of the dividing grooves 14 . The first B side surface 15B and the first C side surface 15C form an acute angle and are continuous. The second B side surface 16B and the second C side surface 16C form an acute angle and are continuous. Further, the surface facing the first C side surface 15C on the first A main surface 11A side is also inclined in the same manner as the first C side surface 15C. A surface facing the second C side surface 16C on the second A main surface 12A side is also inclined in the same manner as the second C side surface 16C. By tilting the surface facing the first C side surface 15C and the surface facing the second C side surface 16C, the light emitted from the surface facing the first C side surface 15C and the surface facing the second C side surface 16C are directed upward. Since the light is refracted to the outside and extracted to the outside, it is possible to reduce the decrease in brightness in the vicinity of the dividing grooves 14 .

In the example shown in FIG. 26F, the first C side surface 15C and the surfaces facing the first C side surface 15C are inclined with respect to the main surfaces 11A and 11B, respectively. The second C side surface 16C and the surfaces facing the second C side surface 16C are also inclined with respect to the main surfaces 12A and 12B, respectively. Furthermore, in this example, at least the first C side surface 15C, the surface facing the first C side surface 15C, and the second C side surface 16C and the surface facing the second C side surface 16C each have a curved surface. In particular, since the surface facing the first C side surface 15C and the surface facing the second C side surface 16C have curved surfaces, part of the light propagating in the light guide portions 10A and 10B toward the dividing grooves 14 is Since it is refracted so as to spread out and is easily taken out to the outside, it is possible to reduce the decrease in luminance in the vicinity of the dividing groove 14 .

At least a part of the first A side surface 15A and the second A side surface 16A are in contact with each other, so that light can be easily propagated between the first A side surface 15A and the second A side surface 16A. In addition to contacting the first A side surface 15A and the second A side surface 16A as in this example, the first A side surface 15A may contact the surface facing the second C side surface 16C, or the second A side surface 16A may face the first C side surface 15C. It can also be in contact with the face.

In addition, in the thickness direction of the first light guide section 10A, the distance between the first C side surface 15C and the surface facing the first C side surface 15C becomes shorter toward the first A side surface 15A. In other words, the thickness of the first convex portion 17 in the thickness direction of the first light guide portion 10A becomes thinner as it approaches the dividing groove 14 . The distance between the second C side surface 16C and the surface facing the second C side surface 16C also becomes shorter as it approaches the second A side surface 16A. In other words, the thickness of the second convex portion 18 in the thickness direction of the second light guide portion 10B becomes thinner as it approaches the dividing groove 14 . As described above, the thicknesses of the first convex portion 17 and the second convex portion 18 become thinner as they approach the dividing groove 14, so that part of the light propagating in the light guide portion 10A and directed toward the first A side surface 15A Since part of the light propagating in the optical section 10B and traveling toward the second A side surface 16A is easily extracted to the outside from the surface facing the first C side surface 15C and the surface facing the second C side surface 16C, respectively, the dividing groove 14 It is possible to reduce the decrease in brightness in the vicinity.

In the example shown in FIG. 26G, the first B side surface 15B and the second B side surface 16B are inclined with respect to the main surfaces 11A, 11B, 12A, 12B. The width of the first groove portion 14a formed by the first B side surface 15B and the second B side surface 16B gradually widens from the second groove portion 14b toward the B main surfaces 11B and 12B. A part of the light propagating in the optical sections 10A and 10B can be reflected toward the A main surfaces 11A and 12A and taken out to the outside. Therefore, it is possible to reduce the decrease in brightness in the vicinity of the dividing grooves 14 . The first A side 15A and the second A side 16A are perpendicular to the major surfaces 11A, 11B, 12A, 12B, and can facilitate light propagation between the first A side 15A and the second A side 16A. In this embodiment, no steps are formed between the first A side surface 15A and the first B side surface 15B and between the second A side surface 16A and the second B side surface 16B.

The configuration shown in FIG. 26H arranges the first C side 15C between the first A side 15A and the first B side 15B shown in FIG. 26G, and the second C side 16C between the second A side 16A and the second B side 16B. Corresponds to the arranged configuration. By having the first C side surface 15C and the second C side surface 16C, part of the light propagating between the first A side surface 15A and the second A side surface 16A can be easily reflected toward the A main surfaces 11A and 12A. , the decrease in brightness in the vicinity of the dividing grooves 14 can be further reduced.

In the example shown in FIG. 26I, the cross-sectional shape of the first groove portion 14a is an inverted U-shape, and the first C side surface 15C and the second C side surface 16C are curved surfaces. As a result, the light propagating in the light guide portions 10A and 10B toward the dividing groove 14 is scattered by being reflected by the respective curved surfaces. This can increase the amount of light that is extracted through the grooves 14, thereby reducing the decrease in brightness in the vicinity of the dividing grooves 14.

A plurality of steps may be provided between the first A side surface 15A and the first B side surface 15B, and a plurality of steps may be provided between the second A side surface 16A and the second B side surface 16B. In the example shown in FIG. 26J, there are two steps between the 1A side 15A and the 1B side 15B, and there are two steps between the 2A side 16A and the 2B side 16B. . By having a plurality of steps in this manner, it is possible to facilitate scattering of the light propagating through the light guide portions 10A and 10B toward the dividing grooves 14 . Therefore, it is possible to reduce the amount of light totally reflected by the A main surfaces 11A and 12A and increase the amount of light extracted to the outside, thereby reducing the reduction in brightness in the vicinity of the dividing grooves 14 .

In the embodiment described above, the 1A side surface 15A continues to the 1A main surface 11A, the 1B side surface 15B continues to the 1B main surface 11B, the 2A side surface 16A continues to the 2A main surface 12A, and the An example in which the 2B side surface 16B is continuous with the 2B main surface 12B is shown.

Conversely, as shown in FIG. 26K, the first A side surface 15A continues to the first B main surface 11B, the first B side surface 15B continues to the first A main surface 11A, and the second A side surface 16A continues to the second B main surface. 12B, and the second B side surface 16B may be continuous with the second A major surface 12A. That is, the second groove portion 14b formed on the first A side surface 15A and the second A side surface 16A is located between the support member 200 and the first groove portion 14a. The first groove portion 14a is open on the side of the first A main surface 11A and the second A main surface 12A.

In this case, after the light guide plate 110 is placed on the support member 200, a cutting tool is inserted into the first groove portion 14a to cut the portion of the light guide plate 110 that is connected below the first groove portion 14a to cut the second groove portion. 14b.

The inside of the first groove portion 14a may be filled with the light reflecting members 40A and 40B. In this case, the first B side surface 15B of the first light guide portion 10A and the second B side surface 16B of the second light guide portion 10B are connected via the light reflecting members 40A and 40B filled in the first groove portion 14a. There is concern about the occurrence of warpage. Therefore, it is preferable that a space (air layer) exists between the first B side surface 15B and the second B side surface 16B.

The dividing groove 14 of FIG. 26K corresponds to the upside down configuration of the dividing groove 14 of FIG. 26B. 26A, 26C to 26J can also be applied to the planar light source of this embodiment by turning the partition grooves 14 upside down. Even in such a configuration, the partitioning by the partitioning groove 14 depends on the cross-sectional shape of the partitioning groove 14 and the distribution ratio between the portion where the light reflecting member 40 is arranged and the portion where the light reflecting member 40 is not arranged on the first side surface 15 and the second side surface 16. In addition, the amount of light propagating between the adjacent light guide portions 10A and 10B can be adjusted.

[Fourth Embodiment]
FIG. 27 is a schematic cross-sectional view of a portion where the first light source 20A is arranged and its peripheral portion in the planar light source according to the fourth embodiment of the present invention.

Note that the first light guide portion 10A, the first A main surface 11A, the first B main surface 11B, and the first light source 20A shown in FIG. Surface 12B and second light source 20B can be substituted.

The first light source 20A includes a light emitting element 21, a first translucent member 22, a covering member 24, an adhesive member 26, and an electrode 23. The covering member 24 is arranged on the side surface and the bottom surface of the light emitting element 21 . The first translucent member 22 is arranged on the light emitting element 21 and the covering member 24 . The light emitting element 21 is adhered to the first translucent member 22 with a translucent adhesive member 26 . The covering member 24 covers the adhesive member 26 and the side and bottom surfaces of the light emitting element 21 . A lower surface of the electrode 23 is exposed from the covering member 24 .

The first light guide portion 10A has a first concave portion 113 that opens toward the first B main surface 11B side as a first hole portion. The first concave portion 113 is a truncated cone-shaped space in the present embodiment, and may be, for example, a truncated polypyramidal space such as a truncated quadrangular pyramid or a truncated hexagonal pyramid. The first light source 20A is arranged inside the first recess 113 . A third translucent member 45 is arranged between the side surface of the first recess 113 and the side surface of the first light source 20A. The third translucent member 45 is, for example, a resin member translucent to the light emitted by the first light source 20A.

A second recessed portion 114 is formed at a position facing the first recessed portion 113 on the first A main surface 11A side of the first light guide portion 10A. The second concave portion 114 is, for example, a concave portion having a polygonal pyramid shape such as a cone shape, a square pyramid shape, or a hexagonal pyramid shape, or a polygonal pyramid shape such as a truncated cone shape, a square pyramid shape, or a hexagonal pyramid shape. is mentioned. A light adjusting member 46 is arranged in the second concave portion 114 . The light adjustment member 46 is configured similarly to the light adjustment member 74 described above.

A light reflecting member 44 is arranged on the 1B main surface 11B of the first light guide section 10A. The light reflecting member 44 is, for example, a resin member containing a light diffusing agent. The light reflecting member 44 is also arranged on the lower surface of the third translucent member 45 .

The light emitting module 100 further includes a wiring layer 56 in addition to the configuration described above. The wiring layer 56 is arranged on the lower surface of the light reflecting member 44 and the lower surface of the covering member 24 . A pair of wiring layers 56 are arranged corresponding to the pair of positive and negative electrodes 23 of the first light source 20A, and each wiring layer 56 is connected to each electrode 23 . A wiring substrate 55 is attached to the wiring layer 56 .

The plurality of light guide portions in the light emitting module 100 include a light guide portion having an outer peripheral portion that is not adjacent to another light guide portion via the dividing groove 14 . In the outer peripheral portion, light reflecting members may also be arranged on the first A side surface 15A and the second A side surface 16A. For example, in FIG. 2, the light reflecting member may be arranged on the first A side surface 15A of the outer peripheral portion of the left end of the first light guide portion 10A, and may be arranged on the second A side surface 16A of the outer peripheral portion of the right end of the second light guide portion 10B. A light reflecting member may be arranged.

FIG. 28A is a schematic cross-sectional view showing an example of the outer peripheral portion 11C of the first light guide portion 10A, for example. In this outer peripheral portion 11C, the first light reflecting member 40A described above is arranged on the first B side surface 15B and the first C side surface 15C. Further, a light reflecting member 47 (hereinafter referred to as a fourth light reflecting member 47) is arranged on the first A side surface 15A. That is, the fourth light reflecting member 47 is arranged on the support member 200 so as to cover the first A side surface 15A and the first light reflecting member 40A. The support member 200 extends outside the first B side surface 15B so as to overlap with the first A side surface 15A and the first C side surface 15C in plan view. A fourth light reflecting member 47 is arranged on the uppermost second adhesive member 43 in the extended portion of the supporting member 200 . The material of the fourth light reflecting member 47 can be the same material as that of the first light reflecting member 40A.

For example, on the first side surface 15 of the first light guide portion 10A adjacent to the second light guide portion 10B (first side surface 15 on the right side in FIG. 2), the first light source 20A arranged in the first light guide portion 10A , toward the first side surface 15, diffusely reflected by the first light reflecting member 40A arranged on the first side surface 15, and returned into the first light guide portion 10A. Furthermore, the light is directed from the first light source 20A toward the first side surface 15, transmitted through the first light reflecting member 40A, and diffusely reflected by the second light reflecting member 40B arranged on the second side surface 16 of the adjacent second light guide section 10B. Then, light returning to the inside of the first light guide section 10A is obtained. In other words, return light from the two light reflecting members 40A and 40B can be obtained in the region on the side surface adjacent to the other light guide portion.

As shown in FIG. 28A, even in the outer peripheral portion 11C where there is no adjacent light guide portion, light is emitted from the two light reflection members, the first light reflection member 40A and the fourth light reflection member 47, into the first light guide portion 10A. light can be returned. Therefore, in the first light guide portion 10A, variation in luminance between the region on the side of the first side surface 15 adjacent to the second light guide portion 10B and the region on the side of the outer peripheral portion 11C not adjacent to other light guide portions is reduced. can do.

As shown in FIG. 28B, in the outer peripheral portion 11C, the end portions of the first adhesive member 41, the third light reflecting member 42, and the second adhesive member 43 are positioned further than the first B side surface 15B of the first light guide portion 10A. 1 It can also be positioned on the side closer to the light source 20A. As a result, between the wiring board 50 and the 1B main surface 11B of the first light guide portion 10A exposed from the first adhesive member 41, the third light reflecting member 42, and the second adhesive member 43, the fourth light reflection light is formed. A portion of member 47 is positioned.

The ends of the first adhesive member 41 and the second adhesive member 43 are covered with the fourth light reflecting member 47 and are not exposed to the outside of the planar light source. can prevent the adhesion of dust and dirt. Also, light leakage from the ends of the first adhesive member 41, the third light reflecting member 42, and the second adhesive member 43 can be prevented.

FIG. 29 is a schematic cross-sectional view showing an example of the outer peripheral portion 12C of the second light guide portion 10B, for example.

As shown in FIG. 1, the planar light source 300 has a quadrangular shape with four sides in plan view, and the wiring substrate 50 also has a quadrangular shape with four sides in plan view. A terminal portion 400 for connecting an external circuit and a wiring layer of the wiring board 50 is arranged near, for example, one side of the wiring board 50 . The outer peripheral portion 12C of the second light guide portion 10B is located on the side of the wiring substrate 50 on which the terminal portion 400 is arranged.

The above-described second light reflecting member 40B is arranged on the second B side surface 16B and the second C side surface 16C of the outer peripheral portion 12C. Further, a light reflecting member 48 (hereinafter referred to as a fifth light reflecting member 48) is arranged on the second A side surface 16A. The fifth light reflecting member 48 is arranged on the wiring board 50 and covers the second A side surface 16A and the second light reflecting member 40B. The material of the fifth light reflecting member 48 can be the same material as that of the second light reflecting member 40B.

In the outer peripheral portion 11C shown in FIGS. 28A and 28B, the end faces of the fourth light reflecting member 47 and the end faces of the support member 200 can be aligned, that is, arranged on the same plane. Such an arrangement can be obtained, for example, by cutting the fourth light reflecting member 47 and the support member 200 together. On the other hand, as shown in FIG. 29, outside the outer peripheral portion 12C, the wiring substrate 50 and the insulating film 52 extend beyond the second side surface 16, and terminals are provided on the extended wiring substrate 50. A part 400 is arranged. For this reason, the wiring board 50 cannot be cut outside the second side surface 16, and the fifth light reflecting member 48 arranged on the second side surface 16 is not cut, for example, in a state of fluid resin. It is supplied onto the wiring substrate 50 and cured as it is. Therefore, the side surface of the fifth light reflecting member 48 has a convex curved surface.

28B, the end portions of the first adhesive member 41, the third light reflecting member 42, and the second adhesive member 43 are attached to the second B side surface of the second light guide portion 10B. It is positioned closer to the second light source 20B than 16B. Then, between the wiring substrate 50 and the second B main surface 12B of the second light guide portion 10B exposed from the first adhesive member 41, the third light reflecting member 42, and the second adhesive member 43, the fifth light reflecting member 48 are placed.

FIG. 30 is a schematic cross-sectional view showing an example of an outer peripheral portion of a display device 500A including a planar light source according to an embodiment of the invention. FIG. 30 shows the vicinity of the outer peripheral portion of the first light guide portion 10A. The vicinity of the outer peripheral portion of the second light guide portion 10B is configured similarly to the vicinity of the outer peripheral portion of the first light guide portion 10A.

The display device 500A includes any one of the planar light sources of the embodiments described above, an optical sheet 503, a liquid crystal panel 504, and a frame 502. FIG. The planar light source functions as a backlight for the display device 500A.

The support member 200 extends outside the outer peripheral portion of the first light guide portion 10A (the outer peripheral portion of the second light guide portion 10B), and the uppermost second adhesive member 43 in the extended portion of the support member 200. A frame 502 is arranged thereon. A lower surface of the frame 502 is adhered to the second adhesive member 43 . The frame 502 is arranged outside the outer peripheral portion of the first light guide portion 10A (the outer peripheral portion of the second light guide portion 10B). That is, the first light guide portion 10A (the second light guide portion 10B) is located inside the area surrounded by the frame 502 . The frame 502 is made of a white resin member that reflects light emitted from the planar light source, or a black resin member that blocks (absorbs) light emitted from the planar light source.

The optical sheet 503 is arranged on the first light guide section 10A (the second light guide section 10B) inside the area surrounded by the frame 502 . The optical sheet 503 faces the A main surfaces 11A and 12A of the light guide portions 10A and 10B. The optical sheet 503 includes, for example, multiple light diffusion sheets and multiple prism sheets.

A liquid crystal panel 504 is arranged on the optical sheet 503 . The optical sheet 503 is arranged between the planar light source and the liquid crystal panel 504 . The lower surface of the liquid crystal panel 504 on the outer peripheral side is arranged in contact with the frame 502 .

FIG. 31 is a schematic cross-sectional view of a display device 500B including a planar light source according to an embodiment of the invention.

The display device 500B includes any one of the planar light sources of the embodiments described above, a housing 501, a frame 502, an optical sheet 503, and a liquid crystal panel 504. FIG. The planar light source functions as a backlight for the display device 500B.

A planar light source is arranged on the bottom surface of the housing 501 via an adhesive member 505 . The supporting member 200 of the planar light source is adhered to the upper surface of the adhesive member 505 , and the lower surface of the adhesive member 505 is adhered to the bottom surface of the housing 501 . The housing 501 is made of metal such as aluminum or stainless steel. Alternatively, the housing 501 is made of resin.

A frame 502 is arranged on the bottom surface of the housing 501 via an adhesive member 506 . The frame 502 is arranged outside the outer peripheral portion 11C of the first light guide portion 10A and the outer peripheral portion 12C of the second light guide portion 10B. In other words, the first light guide portion 10A and the second light guide portion 10B are located inside the area surrounded by the frame 502 . The frame 502 is arranged between the side surface of the housing 501 and the outer peripheral portions 11C and 12C of the light guide portions 10A and 10B.

The optical sheet 503 is arranged on the light guide sections 10A and 10B inside the frame body 502 . The optical sheet 503 faces the A main surfaces 11A and 12A of the light guide portions 10A and 10B. The optical sheet 503 includes, for example, multiple light diffusion sheets and multiple prism sheets.

A liquid crystal panel 504 is arranged on the optical sheet 503 . The optical sheet 503 is arranged between the planar light source and the liquid crystal panel 504 . The lower surface of the liquid crystal panel 504 on the outer peripheral side is arranged in contact with the frame 502 .

The outer peripheral portion 11C of the first light guide portion 10A in the planar light source shown in FIG. 31 has, for example, the structure shown in FIG. 28A. Alternatively, the outer peripheral portion 11C of the first light guide portion 10A may have the structure shown in FIG. 28B.

An outer peripheral portion 12C of the second light guide portion 10B has a structure shown in FIG. 29, for example. Therefore, the wiring substrate 50 extends outside the outer peripheral portion 12C. The wiring board 50 extends outside the housing 501 through an opening formed in the frame 502 and an opening formed in the housing 501 outside the outer peripheral portion 12C. A terminal portion 400 is arranged on a portion of the wiring board 50 that extends outside the housing 501 .

[Fifth embodiment]
FIG. 32 is a schematic plan view of a portion where the first light source 20A is arranged and its peripheral portion in the planar light source according to the fifth embodiment of the present invention. FIG. 33 is a schematic cross-sectional view of a portion where the first light source 20A is arranged and its peripheral portion in the planar light source of the fifth embodiment, and is a schematic cross-sectional view taken along line XXXIII-XXXIII of FIG. FIG. 34A is a schematic cross-sectional view showing the cross-sectional shape of the dividing groove 14 in the planar light source of the fifth embodiment.

As shown in FIG. 33, the second translucent member 71 is arranged as a single layer in the first hole 13A without arranging the wavelength converting member and the third translucent member. The second light adjusting member 74 is arranged so as to be in contact with the second translucent member 71 . The second translucent member 71 can contain the above-described phosphor, light diffusing agent, and the like. Since the second translucent member 71 contains a phosphor, it can function like a wavelength conversion member. By including the light diffusing agent in the second translucent member 71, for example, part of the light traveling in the X direction and/or the Y direction from the first light source 20A can be changed into light traveling in the Z direction. This makes it easier to improve luminance unevenness within the light emitting surface.

As shown in FIG. 34A, the 1A side surface 15A continues to the 1B main surface 11B, the 1B side surface 15B continues to the 1A main surface 11A, the 2A side surface 16A continues to the 2B main surface 12B, and the The 2B side surface 16B is continuous with the 2A main surface 12A. A second groove portion 14b defined by the first A side surface 15A and the second A side surface 16A is positioned between the support member 200 and the first groove portion 14a. The first groove portion 14a is open on the side of the first A main surface 11A and the second A main surface 12A. The first B side surface 15B and the second B side surface 16B of the fifth embodiment are inclined with respect to the main surfaces 11A, 11B, 12A, 12B. For example, the width of the first groove portion 14a gradually widens from the B main surfaces 11B and 12B toward the A main surfaces 11A and 12A. By appropriately selecting the cross-sectional shape of the dividing groove 14, the amount of light propagating between the light guide portions 10A and 10B can be adjusted.

As shown in FIG. 34B, the first side surface 15 has a first A side surface 15A, a first B side surface 15B, a first C side surface 15C and a first D side surface 15D. Similarly, the second side 16 has a second A side 16A, a second B side 16B, a second C side 16C and a second D side 16D. The first A side surface 15A continues to the first B main surface 11B, and the first B side surface 15B continues to the first A main surface 11A. The first C side 15C and the first D side 15D are located between the first A side 15A and the first B side 15B. The first C side surface 15C is continuous with the first A side surface 15A, and the first D side surface 15D is continuous with the first B side surface 15B. The second A side surface 16A continues to the second B main surface 12B, and the second B side surface 16B continues to the second A main surface 12A. The second C side 16C and the second D side 16D are located between the second A side 16A and the second B side 16B. The second C side surface 16C is continuous with the second A side surface 16A, and the second D side surface 16D is continuous with the second B side surface 16B. The first B side surface 15B and the second B side surface 16B are perpendicular to the major surfaces 11A, 11B, 12A, 12B of the light guides 10A, 10B. By doing so, variation in the width of the first groove portion 14a defined by the first B side surface 15B and the second B side surface 16B in the thickness direction of the first light guide portion 10A is suppressed. As a result, variations in the width of the first groove portion 14a can be suppressed, making it easier to suppress uneven brightness in each light emitting region. The first D side surface 15D and the second D side surface 16D are inclined with respect to the main surfaces 11A, 11B, 12A, 12B. For example, the width of the second D side surface 16D from the first D side surface 15D gradually widens from the B main surfaces 11B and 12B toward the A main surfaces 11A and 12A. By appropriately selecting the cross-sectional shape of the dividing groove 14, the amount of light propagating between the light guide portions 10A and 10B can be adjusted.

35A to 35E are schematic cross-sectional views showing an example of the manufacturing method of the planar light source of the fifth embodiment.

After the first hole 13A and the second hole 13B are formed in the light guide plate 110 as shown in FIG. 5, the first member 91 is formed to cover the first main surface 110A of the light guide plate 110 as shown in FIG. 35A. do. The first member 91 covers the opening of the first hole 13A on the first main surface 110A side and the opening of the second hole 13B on the first main surface 110A side. In this state, the first grooves 14a are formed in the light guide plate 110 as shown in FIG. 35B. A portion of the first member 91 is removed when forming the first groove portion 14 a in the light guide plate 110 . By doing so, as shown in FIG. 35B, it becomes easier to cover the portion of the first main surface 110A located in the peripheral region of the first groove portion 14a with the first member 91. As shown in FIG. Next, as shown in FIG. 35C, a light reflecting member 40 is formed to cover the bottom and side surfaces of the first groove portion 14a. The light reflecting member 40 is formed to cover at least part of the first member 91 . Then, by removing the first member 91 from the light guide plate 110, as shown in FIG. can do. This makes it easier for the light from the first light source 20A to be extracted to the outside from the first major surface 11 located in the peripheral region of the first groove portion 14a.

The material of the first member 91 is not particularly limited. The material of the first member 91 is preferably a release sheet having an adhesive layer on at least one surface and having a function of decreasing the adhesiveness due to temperature change, light irradiation, or the like. For example, it is preferable that the adhesive layer contains a foaming agent that foams when heated. By heating this adhesive layer, the first member 91 can be easily peeled off from the light guide plate 110 . A commercially available product may be used as such a release sheet. Examples of the release sheet include temperature-sensitive adhesive sheets manufactured by Nitta Corporation.

After forming the light reflecting member 40 covering the bottom and side surfaces of the first groove portion 14a, the light guide plate is arranged on the supporting member. After placing the light guide plate 110 on the support member 200, as shown in FIG. 35E, the portion of the light guide plate 110 that is connected below the first groove portion 14a is removed to form the second groove portion 14b. As a method for removing the portion of the light guide plate 110 that is connected below the first groove portion 14a, for example, a known method such as cutting or laser processing can be used. When cutting is used, an ultrasonic cutter, a rotary blade, or the like may be used. After that, the steps after FIG. 14 are continued. In addition, the order of the process of removing the part connected under the 1st groove part 14a and forming the 2nd groove part 14b is not specifically limited. For example, the step of forming the second groove portion 14b may be performed after arranging the light source in the hole, or after forming the second translucent member in the hole.

[Sixth Embodiment]
FIG. 36 is a schematic plan view showing a display device 500C including a planar light source according to an embodiment of the invention. FIG. 37 is a schematic cross-sectional view taken along line XXXVII--XXXVII of FIG. FIG. 38 is a schematic plan view of the display device 500C of FIG. 36 with the optical sheet 503 and the liquid crystal panel 504 omitted.

The display device 500C includes any one of the planar light sources of the embodiments described above, an optical sheet 503, a liquid crystal panel 504, and a holding member 505. The planar light source functions as a backlight for the display device 500C.

As shown in FIG. 37, the support member 200 has an extending portion extending outside the outer peripheral portion of the first light guide portion 10A (the outer peripheral portion of the second light guide portion 10B). The display device 500</b>C has a holding member 505 arranged on the extended portion of the support member 200 . The holding member 505 can be fixed onto the support member 200 by an adhesive or the like. The holding member 505 is arranged outside the outer peripheral portion of the first light guide portion 10A (the outer peripheral portion of the second light guide portion 10B). The number of holding members 505 may be plural as shown in FIG. 36, or may be one.

As shown in FIG. 38, it is preferable that a portion of the holding member 505 extending in the Y direction and a portion of the dividing groove 14 extending in the X direction overlap in the X direction. By doing so, it is possible to prevent the planar light source from bending along the X direction. A part of the dividing groove 14 extending in the X direction is preferably sandwiched in the X direction by a part of the holding member 505 extending in the Y direction. By doing so, it is possible to prevent the planar light source from bending along the X direction. A portion of the holding member 505 extending in the X direction and a portion of the dividing groove 14 extending in the Y direction preferably overlap in the Y direction. By doing so, it is possible to prevent the planar light source from bending along the Y direction. A part of the dividing groove 14 extending in the Y direction is preferably sandwiched in the Y direction by a part of the holding member 505 extending in the X direction. By doing so, it is possible to prevent the planar light source from bending along the Y direction. As shown in FIG. 38, the holding member 505 preferably surrounds the light guides 10A and 10B in plan view. By doing so, it is possible to suppress deformation of the planar light source.

The holding member 505 uses a material that is less deformable by an external force than the wiring board 50 of the planar light source. As a material for the holding member 505, for example, acrylic, polycarbonate, cyclic polyolefin, thermoplastic resin such as polyethylene terephthalate or polyester, thermosetting resin such as epoxy or silicone, glass, or the like can be used. The material of the holding member 505 and the material of the light guide portions 10A and 10B may be the same.

[Seventh Embodiment]
FIG. 39 is a schematic plan view showing a planar light source 300A according to an embodiment of the invention. FIG. 40 is a schematic plan view showing the planar light source 300A and the holding member 505. FIG. FIG. 41 is a schematic cross-sectional view showing a display device 500D including a planar light source 300A. FIG. 42 is a schematic cross-sectional view showing a modification of the display device 500D.

The display device 500D includes a planar light source 300A, an optical sheet 503, a liquid crystal panel 504, and a holding member 505. The planar light source 300A functions as a backlight for the display device 500D.

As shown in FIG. 39, even if the planar light source 300A includes a plurality of outer peripheral light guide portions 10D located outside the outer peripheral portion of the first light guide portion 10A (the outer peripheral portion of the second light guide portion 10B), good. The outer peripheral light guide portion 10D can be formed by a part of the light guide plate 110 when the light guide plate 110 is separated by the dividing groove 14, for example. As shown in FIG. 39 , each of the plurality of outer peripheral light guide portions 10D is separated by partition grooves 14 .

When the planar light source 300A is provided with a plurality of outer peripheral light guide portions 10D extending outside the outer peripheral portion of the first light guide portion 10A (the outer peripheral portion of the second light guide portion 10B), as shown in FIGS. As shown in FIG. 41, the holding member 505 is arranged on the outer peripheral light guide portion 10D. As shown in FIG. 40, it is preferable to have a holding member 505 extending over a plurality of outer peripheral light guide portions 10D. By doing so, it is possible to suppress bending of the planar light source 300A. Moreover, as in a display device 500E shown in FIG. 42, the holding member 505 may be arranged on the first light guide portion 10A and the outer peripheral light guide portion 10D. By doing so, it is possible to suppress bending of the planar light source 300A. Further, when the planar light source 300A does not include the plurality of outer peripheral light guide portions 10D, the holding member 505 may be arranged so as to straddle the plurality of light guide portions positioned on the outer periphery. By doing so, it is possible to suppress bending of the planar light source.

In this specification, the 1A main surface may be referred to as the first main surface. The 1B principal surface may be referred to as the first second principal surface. The 2A principal surface may be referred to as the second first principal surface. The 2B main surface may be referred to as a second main surface. The first A side may be referred to as the first first side. The first B side may be referred to as the first second side. The first C side may be referred to as the first third side. The first D side may be referred to as the first fourth side. The second A side may be referred to as the second first side. The second B side may be referred to as the second second side. The 2nd C side may be called the 2nd 3rd side. The second D side may be referred to as the second fourth side.

According to one aspect of the present invention, a light emitting module includes a light source section including a first light source and a second light source, a first main surface, and a light source on the opposite side of the first main surface. a first second principal surface located thereon; a first side surface located between the first first principal surface and the first second principal surface; and a first hole in which the first light source is arranged. a second first main surface; a second second main surface located on the opposite side of the second first main surface; and the second first main surface. A second light guide including a second side surface located between the main surface and the second main surface and facing the first side surface, and a second hole in which the second light source is arranged. and a light reflecting member disposed between the first side surface and the second side surface. The first side includes a first first side and a first second side. The second side includes a second first side facing the first first side and a second second side facing the first second side. The light reflecting member is arranged on at least one of the first second side surface and the second second side surface such that the first first side surface and the second first side surface are exposed. be done. The distance between the first first side surface and the second first side surface is shorter than the distance between the first second side surface and the second second side surface.

As shown in FIG. 34B, the first side 15 has a first first side, a first second side, a first third side, and a first fourth side. . Similarly, the second side 16 has a second first side, a second second side, a second third side, and a second fourth side.

The embodiments of the present invention have been described above with reference to specific examples. However, the invention is not limited to these specific examples. Based on the above-described embodiment of the present invention, all forms that can be implemented by those skilled in the art by appropriately designing and changing are also included in the scope of the present invention as long as they include the gist of the present invention. In addition, within the scope of the idea of the present invention, those skilled in the art can conceive of various modifications and modifications, and these modifications and modifications also belong to the scope of the present invention.

5 Light emitting region 10 Light guide member 10A First light guide part 10B Second light guide part 11A First A main surface 11B First B main surface 12A Second A main surface 12B Second B main surface 13A First hole 13B Second hole 14 Partitioning groove 14a First groove 14b Second groove 15 First side 15A 1A side 15B 1B side 15C 1C side 16 2nd side 16A 2A side 16B 2B side 16C 2C side 20 light source 20A first light source 20B second light source , 21... light emitting element, 22... first translucent member, 24... covering member, 25... first light adjusting member, 40... light reflecting member, 40A... first light reflecting member, 40B... second light reflecting member, 42...Third light reflecting member 50...Wiring board 71...Second translucent member 72...Wavelength conversion member 73...Third translucent member 74...Second light adjusting member 81...First opening Parts 100 Light emitting module 110 Light guide plate 113 Recess 200, 210 Support member 300 Planar light source

Claims (10)

a light source unit including a first light source and a second light source;
A 1A main surface, a 1B main surface located opposite to the 1A main surface, a first side surface located between the 1A main surface and the 1B main surface, and the first light source. a first light guide portion including a first hole disposed; a second A main surface; a second B main surface located on the opposite side of the second A main surface; a light guide member including a second light guide section including a second side surface positioned between the main surface and facing the first side surface, and a second hole in which the second light source is arranged; ,
a light reflecting member disposed between the first side surface and the second side surface;
The first side includes a first A side and a first B side,
The second side includes a 2A side facing the 1A side and a 2B side facing the 1B side,
The light reflecting member includes a first light reflecting member arranged on the first B side surface and a second light reflecting member arranged on the second B side surface, and the first light reflecting member and the second light reflecting member are arranged on the second side B. There is an air layer between the reflecting member,
The first A side surface and the second A side surface are exposed from the light reflecting member,
The light emitting module, wherein a distance between the first A side and the second A side is shorter than a distance between the first B side and the second B side. The first light source is located on the first B main surface side,
The 1A side surface is continuous with the 1A main surface, and the 1B side surface is continuous with the 1B main surface,
The second light source is located on the second B main surface side,
The light emitting module according to claim 1, wherein the 2A side surface is continuous with the 2A main surface, and the 2B side surface is continuous with the 2B main surface. The first light reflecting member is arranged to extend on the first B main surface,
3. The light emitting module according to claim 2, wherein said second light reflecting member is arranged to extend on said second B main surface. forming a first opening in the first light reflecting member around the first light source on the first B main surface, in which the first light reflecting member is not arranged;
4. The light emitting module according to claim 3, wherein the second light reflecting member is formed with a second opening around the second light source on the 2B main surface, in which the second light reflecting member is not arranged. The light emitting module according to any one of claims 1 to 4, wherein the first A side and the second A side are in contact with air. the first side includes the first A side and a first C side located between the first A side and the first B side;
The light emitting module according to any one of claims 1 to 5, wherein the first light reflecting member is arranged on the 1B side surface and the 1C side surface. The second side includes the 2A side and a 2C side located between the 2A side and the 2B side,
The light emitting module according to any one of claims 1 to 6, wherein the second light reflecting member is arranged on the 2B side surface and the 2C side surface. The length of the first B side in the thickness direction of the first light guide section is longer than the length of the first A side in the thickness direction of the first light guide section,
8. The length of the 2B side surface in the thickness direction of the second light guide section is longer than the length of the 2A side surface in the thickness direction of the second light guide section. The light-emitting module according to . The light emitting module according to any one of claims 1 to 8, wherein the light reflecting member is a resin member containing a light diffusing agent. a wiring board;
The light emitting module according to any one of claims 1 to 9, arranged on the wiring board with the first B main surface and the second B main surface facing the wiring board;
A planar light source.

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