JP7032680B1 - Light emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the optical coupling efficiency between a light emitting device and a light guide plate. A light emitting device covers at least one first light emitting element 121 and a second light emitting element 122 arranged along a first direction, an upper surface 121a of the first light emitting element, and an upper surface 122a of the second light emitting element. The translucent members 131A and 131B and the light-reflecting member 140A in contact with the side surface of the translucent member are provided. The translucent member has a first surface 31 and a second surface 32 exposed from the light reflective member. The first surface is located above the upper surface of the first light emitting element, and the second surface is located above the upper surface of the second light emitting element. The light reflective member has a first portion 141 located between the first surface and the second surface in the first direction and above the first surface and the second surface, and includes the first direction. In the first cross section perpendicular to the upper surface of one light emitting element, the surface of the first portion includes at least one concave curved surface 41, 42. [Selection diagram] Fig. 3

Description

The present disclosure relates to a light emitting device.

As a light source for the backlight of a liquid crystal display device, a light emitting device including an LED as a part thereof is widely used. For example, Patent Document 1 below discloses a side-emitting LED package including two LEDs. Such a side-emitting LED package is used with the light emitting surface facing the side surface of the light guide plate. The light from the LED package is incident on the light guide plate from the side surface of the light guide plate.

Japanese Unexamined Patent Publication No. 2019-036713

In a backlight including a light guide plate as a part thereof, there is a demand for improving the optical coupling efficiency between the light emitting device and the light guide plate.

The light emitting device according to an embodiment of the present disclosure is arranged along a first direction, and has a first light emitting element and a second light emitting element, each having an upper surface and a side surface, and a upper surface of the first light emitting element having a side surface. And at least one translucent member covering the upper surface of the second light emitting element, at least a part of the side surface of the first light emitting element, at least a part of the side surface of the second light emitting element, and the translucent member. The translucent member comprises a light-reflecting member in contact with a side surface of the light-reflecting member, the translucent member has a first surface and a second surface exposed from the light-reflecting member, and the first surface is the first light emitting element. The second surface is located above the upper surface of the second light emitting element, and the light reflective member is formed by the first surface and the second surface in the first direction. In a first cross section having a first portion between the first surface and above the second surface, including the first direction and perpendicular to the upper surface of the first light emitting element, the first surface. The surface of the portion comprises at least one concave curved surface.

According to the embodiment of the present disclosure, it is possible to provide a light emitting device having improved optical coupling efficiency to the light guide plate.

It is a top perspective view schematically showing an example of a light emitting device according to the first embodiment of the present disclosure. It is a schematic bottom perspective view of the light emitting device shown in FIG. 1. FIG. 3 is a schematic cross-sectional view of the light emitting device shown in FIGS. 1 and 2. It is a figure which shows typically the backlight which has the light emitting device by embodiment of this disclosure. It is a schematic cross-sectional view which shows the other example of the shape of the 1st part of a light-reflecting member. FIG. 3 is a schematic cross-sectional view of a light emitting device according to a second embodiment of the present disclosure. FIG. 3 is a schematic cross-sectional view showing another example of the light emitting device according to the second embodiment of the present disclosure. FIG. 3 is a schematic cross-sectional view showing still another example of the light emitting device according to the second embodiment of the present disclosure. FIG. 3 is a schematic cross-sectional view showing still another example of the light emitting device according to the second embodiment of the present disclosure. FIG. 3 is a schematic cross-sectional view showing still another example of the light emitting device according to the second embodiment of the present disclosure. It is a figure which shows the other cross section of the light emitting device according to the 2nd Embodiment of this disclosure schematically. It is a figure which shows the other cross section of the light emitting device according to the 2nd Embodiment of this disclosure schematically. It is a figure which shows the cross section of the other modification example of the light emitting device by the 2nd Embodiment of this disclosure. It is a figure which shows the exemplary cross section of the further modification example of the light emitting device by the 2nd Embodiment of this disclosure. FIG. 3 is a schematic cross-sectional view showing still another modification of the light emitting device according to the second embodiment of the present disclosure. It is a figure which shows an example of the appearance of the light emitting device according to the embodiment of the present disclosure when viewed from the lower surface side of the substrate. It is a figure which shows an example of the appearance of the light emitting device according to the embodiment of the present disclosure when viewed from the side of the surface facing the wiring board. It is a schematic top view of the assembly board on which the light emitting element according to the embodiment of this disclosure is mounted. It is a schematic bottom view of the assembly board on which the light emitting element according to the embodiment of this disclosure is mounted. It is a schematic top view which shows the exemplary manufacturing method of the light emitting device by embodiment of this disclosure. It is a schematic cross-sectional view which shows the exemplary manufacturing method of the light emitting device by embodiment of this disclosure. It is a schematic cross-sectional view which shows the exemplary manufacturing method of the light emitting device by embodiment of this disclosure. It is a schematic cross-sectional view which shows the exemplary manufacturing method of the light emitting device by embodiment of this disclosure. It is a schematic top view which shows the exemplary manufacturing method of the light emitting device by embodiment of this disclosure. It is a schematic cross-sectional view which shows the exemplary manufacturing method of the light emitting device by embodiment of this disclosure. It is a schematic diagram which shows the calculation result of the irradiance in the light guide plate about the sample of Example 1. FIG. It is a schematic diagram which shows the calculation result of the irradiance in the light guide plate about the sample of Example 2. It is a schematic diagram which shows the calculation result of the irradiance in the light guide plate about the sample of Example 3. FIG. It is a schematic diagram which shows the calculation result of the irradiance in the light guide plate about the sample of Example 4. It is a schematic diagram which shows the calculation result of the irradiance inside the light guide plate about the sample of Reference Example 1. It is a schematic diagram which shows the calculation result of the irradiance in the light guide plate about the sample of Reference Example 4. It is a schematic diagram which shows the calculation result of the irradiance inside the light guide plate about the sample of Reference Example 5. 6 is a six-view view and a perspective view thereof showing still another example of the light emitting device according to the second embodiment of the present disclosure. 6 is a six-view view and a perspective view thereof showing still another example of the light emitting device according to the second embodiment of the present disclosure. It is a figure which shows the exemplary cross section of the further modification example of the light emitting device by the 2nd Embodiment of this disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The following embodiments are examples, and the planar light source according to the present disclosure is not limited to the following embodiments. For example, the numerical values, shapes, materials, steps, the order of the steps, and the like shown in the following embodiments are merely examples, and various modifications can be made as long as there is no technical contradiction. Each embodiment described below is merely an example, and various combinations are possible as long as there is no technical contradiction.

The dimensions, shapes, etc. of the components shown in the drawings may be exaggerated for the sake of clarity, and may not reflect the dimensions, shapes, and magnitude relationships between the components in an actual light emitting device . Further, in order to avoid the drawing from becoming excessively complicated, some elements may be shown schematically by omitting the illustration, or an end view showing only the cut surface may be shown as a cross-sectional view.

In the following description, components having substantially the same function are indicated by common reference numerals, and the description may be omitted. In the following description, terms indicating a specific direction or position (eg, "top", "bottom", "right", "left" and other terms including those terms) may be used. However, those terms are used only for clarity of relative orientation or position in the referenced drawings. If the relative directions or positional relationships in terms such as "upper" and "lower" in the referenced drawings are the same, the drawings other than the present disclosure, actual products, manufacturing equipment, etc. are the same as the referenced drawings. It does not have to be an arrangement. In the present disclosure, "parallel" includes the case where two straight lines, sides, surfaces, etc. are in the range of about 0 ° to ± 5 ° unless otherwise specified. Further, in the present disclosure, "vertical" or "orthogonal" includes the case where two straight lines, sides, surfaces, etc. are in the range of about 90 ° to ± 5 ° unless otherwise specified.

(First Embodiment)
1 and 2 schematically show the appearance of the light emitting device according to the first embodiment of the present disclosure. FIG. 3 shows a schematic cross section of the light emitting device 100A shown in FIGS. 1 and 2. For convenience of explanation, arrows indicating the X, Y, and Z directions orthogonal to each other are also shown in FIGS. 1 to 3. In addition, in other drawings of the present disclosure, arrows indicating these directions may be shown. In the present specification, the X direction in the drawing may be referred to as a first direction.

FIG. 3 corresponds to a schematic cross-sectional view when the light emitting device 100A is cut in parallel with the ZX plane near the center of the light emitting device 100A. As shown in FIG. 3, the light emitting device 100A includes a first light emitting element 121 and a second light emitting element 122. The first light emitting element 121 has an upper surface 121a and a side surface 121c. Similarly, the second light emitting element 122 has an upper surface 122a and a side surface 122c. The first light emitting element 121 and the second light emitting element 122 have electrodes 24 on the lower surface opposite to the upper surface of each. FIG. 3 shows the structure of the light emitting device 100A including the first direction and in a cross section perpendicular to the upper surface 121a of the first light emitting element 121. In the present specification, the ZX cross section may be referred to as a first cross section.

The light emitting device 100A further has a substrate 110 that supports these light emitting elements. The substrate 110 has an upper surface 110a, and the first light emitting element 121 and the second light emitting element 122 are arranged on the upper surface 110a of the substrate 110 along the X direction (first direction) in the drawing.

In the configuration exemplified in FIGS. 1 to 3, the light emitting device 100A includes a first light emitting element 121, a second light emitting element 122, and a substrate 110, as well as a first translucent member 131A and a second translucent member 132A. And the light reflective member 140A. The first translucent member 131A has an upper surface 131a and a lower surface 131b, and a side surface 131c located between the upper surface 131a and the lower surface 131b, and is located above the upper surface 121a of the first light emitting element 121. Here, the Z direction in the figure is a direction from the first light emitting element 121 toward the first translucent member 131A, and the normal line of the upper surface 121a of the first light emitting element 121 is substantially parallel to the Z direction.

As schematically shown in FIG. 3, here, the translucent first joining member 151 is interposed between the first translucent member 131A and the first light emitting element 121. The first translucent member 131A is joined to the upper surface 121a of the first light emitting element 121 by the first joining member 151. A part of the first joining member 151 may be located on the side surface 121c of the first light emitting element 121. It should be noted that the terms "translucent" and "translucent" in the present specification are construed to include and include the fact that they exhibit diffusivity with respect to incident light, and are not limited to "transparent". For example, the first translucent member 131A may be provided with a light diffusing function by dispersing a light diffusing material having a refractive index different from that of the base material.

Like the first translucent member 131A, the second translucent member 132A also has an upper surface 132a, a lower surface 132b, and a side surface 132c. In the configuration exemplified in FIG. 3, the second translucent member 132A is located above the upper surface 122a of the second light emitting element 122 by being joined to the second light emitting element 122 by the second joining member 152. .. Here, a part of the second joining member 152 is located on the side surface 122c of the second light emitting element 122.

The light reflecting member 140A is formed on the substrate 110 so as to surround the first light emitting element 121 and the second light emitting element 122, and covers a part of the upper surface 110a of the substrate 110. More specifically, the light reflecting member 140A includes a portion of the side surface 121c of the first light emitting element 121 that is not covered by the first joining member 151 and a second joining member 152 of the side surface 122c of the second light emitting element 122. The portion not covered by, the outer surface 151c of the first joining member 151, the outer surface 152c of the second joining member 152, the side surface 131c of the first translucent member 131A, and the side surface 132c of the second translucent member 132A. Is in contact with.

As shown in FIGS. 1 to 3, the light reflecting member 140A does not cover the entire upper surface 131a of the first translucent member 131A. Further, the light reflecting member 140A does not cover all of the upper surface 132a of the second translucent member 132A. In other words, a part or all of the upper surface 131a of the first translucent member 131A and a part or all of the upper surface 132a of the second translucent member 132A are exposed from the light reflecting member 140A. The portion of the upper surface of the translucent member (here, the first translucent member 131A and the second translucent member 132A) exposed from the light reflecting member 140A is a light emitting surface from which light from the light emitting element is taken out. To configure. In the following, the region of the upper surface 131a of the first translucent member 131A exposed from the light-reflecting member 140A and the region of the upper surface 132a of the second translucent member 132A exposed from the light-reflecting member 140A are convenient. It is referred to as a first surface 31 and a second surface 32, respectively. As shown in FIGS. 1 and 2, here, each of the first surface 31 and the second surface 32 has a rectangular shape that is long in the X direction with respect to the Y direction in the drawing.

As shown in FIG. 3, in this example, the entire upper surface 131a of the first translucent member 131A corresponds to the first surface 31, and the entire upper surface 132a of the second translucent member 132A corresponds to the second surface 32. Equivalent to. The first surface 31 is located above the upper surface 121a of the first light emitting element 121, and the second surface 32 is located above the upper surface 122a of the second light emitting element 122. In the examples shown in FIGS. 1 to 3, each of the first surface 31 and the second surface 32 is a substantially flat surface. However, the shapes of the first surface 31 and the second surface 32 are not limited to the flat surface, and may be concave in the cross-sectional view as described later.

The light reflective member 140A has a first portion 141. The first portion 141 is a portion of the light reflecting member 140A located above the first surface 31 and the second surface 32, and is the first surface 31 and the second surface in the X direction in the drawing. It is a part located between 32 and 32. For example, as shown in FIG. 3, in this example, the first portion 141 has a first top portion 141t that is substantially parallel and flat to the first surface 31 and the second surface 32. Here, the "top" is the light-reflecting member 140A from the translucent member (the first translucent member 131A and the second translucent member 132A in the example shown in FIG. 3) in the Z direction in the figure. Refers to the farthest part.

The surface of the first portion 141 of the light reflective member 140A includes at least one concave curved surface in cross-sectional view. As shown in FIG. 3, here, the surface of the first portion 141 includes the first curved surface 41 and the second curved surface 42 as a part thereof in the ZX cross section (that is, the first cross section). The first curved surface 41 is located between the first top portion 141t of the first portion 141 and the first surface 31 of the first translucent member 131A. The second curved surface 42 is located between the first top portion 141t of the first portion 141 and the second surface 32 of the second translucent member 132A. As will be described in detail later, the surface of the first portion 141 includes at least one concave curved surface in a cross-sectional view, so that the light from the light emitting device 100A can be used more effectively and the light of the light emitting device 100A with respect to the light guide plate can be used. It becomes possible to improve the bonding efficiency.

In the configurations exemplified in FIGS. 1 to 3, the light reflecting member 140A further includes the first surface 31 (here, the entire upper surface 131a) of the first translucent member 131A at both ends in the X direction in the figure. It has a second portion 142 and a third portion 143 located above the second surface 32 (here, the entire upper surface 132a) of the second translucent member 132A in the Y direction. As shown in FIG. 3, the second portion 142 of the light reflecting member 140A is located on the opposite side of the first portion 141 with respect to the position of the first surface 31 in the X direction of the drawing. On the other hand, the third portion 143 of the light reflecting member 140A is located on the opposite side of the first portion 141 with respect to the position of the second surface 32 in the X direction in the figure. In other words, in the cross section shown in FIG. 3, the first surface 31 of the first translucent member 131A is located at a position sandwiched between the first portion 141 and the second portion 142 of the light reflective member 140A. The second surface 32 of the two translucent member 132A is located between the first portion 141 and the third portion 143 of the light reflective member 140A.

In the example shown in FIGS. 1 to 3, the second portion 142 and the third portion 143 of the light reflective member 140A have a second top portion 142t and a third top portion 143t, respectively. The second top 142t and the third top 143t, like the first top 141t, are the farthest from the first translucent member 131A or the second translucent member 132A of the light reflecting members 140A in the Z direction in the figure. It is a part. Here, the second apex 142t and the third apex 143t are generally flat surfaces like the first apex 141t.

Further, here, the surface of the second portion 142 and the surface of the third portion 143 each have a concave curved surface at least in a part thereof. The surface of the second portion 142 has a concave third curved surface 43 between the second top portion 142t and the first surface 31 of the first translucent member 131A in the ZX cross section. The surface of the third portion 143 has a concave fourth curved surface 44 between the third top portion 143t and the second surface 32 of the second translucent member in the ZX cross section.

FIG. 4 schematically shows an example of a backlight having a light emitting device 100A. The backlight 300 shown in FIG. 4 includes the above-mentioned light emitting device 100A and a light guide plate 200 having an upper surface 200a and a plurality of side surfaces 200c. In FIG. 4, the appearance of the backlight 300 when viewed vertically from the upper surface 200a side of the light guide plate 200 to the upper surface 200a and the appearance of the backlight 300 when viewed from the side surface are shown in one figure. ..

As shown in FIG. 4, the light emitting device 100A includes a first surface 31 of the first translucent member 131A, a second surface 32 of the second translucent member 132A, and one of the side surfaces 200c of the light guide plate 200. Are mounted on the wiring board 400 together with the light guide plate 200 so as to face each other. At this time, the first top portion 141t of the first portion 141 of the light reflecting member 140A can be brought into contact with the side surface 200c of the light guide plate 200.

A part or all of the first top portion 141t of the first portion 141 comes into contact with the side surface 200c of the light guide plate 200, so that the first surface 31 and the second surface 32 as light emitting surfaces are directly between the light guide plate 200. Contact is avoided. By avoiding contact of the first surface 31 and the second surface 32 with the light guide plate 200, the first translucent member 131A or the second translucent member 132A may be damaged due to contact with the light guide plate 200. Can be prevented.

Further, in this example, the first top portion 141t of the first portion 141 has a substantially flat shape. Since the first portion 141 of the light reflective member 140A has the first top portion 141t having such a shape, the first portion 141 is in contact with an external member such as the light guide plate 200, for example, as compared with the case where the first portion 141 is in contact with the external member at one point. , The concentration of stress on the first portion 141 when it comes into contact with the light guide plate 200 or the like can be relaxed. This makes it possible to prevent damage to the first portion 141 due to contact with an external member such as the light guide plate 200.

As described above, the light reflecting member 140A has a portion (for example, the first portion 141) that protrudes to the opposite side of the first light emitting element 121 and the second light emitting element 122 as compared with the first surface 31 and the second surface 32. By providing the above, it is possible to prevent the first surface 31 and the second surface 32 from coming into contact with the light guide plate 200. As a result of avoiding damage to the translucent member due to contact with the light guide plate, the reliability of the light emitting device is improved.

However, if the distance between the side surface 200c of the light guide plate 200 and the first surface 31 and the second surface 32 is extremely increased, the optical coupling efficiency between the light guide plate 200 and the light emitting device 100A may decrease. The distance between the side surface 200c of the light guide plate 200 and the first surface 31 and the second surface 32 is preferably 10 μm or more and 100 μm or less, and more preferably 20 μm or more and 50 μm or less. In other words, it is advantageous that the height of the first portion 141 is in the range of 10 μm or more and 100 μm or less. Here, the height of the first portion 141 is the distance H1 along the Z direction from the end portion of the first surface 31 or the end portion of the second surface 32 to the first top portion 141t of the first portion 141 in the ZX cross section. It can be defined by (see FIG. 3).

In the light emitting device 100A, the light emitted from the first light emitting element 121 and incident on the first translucent member 131A is taken out from the first surface 31 of the first translucent member 131A to the outside of the light emitting device 100A. Similarly, the light emitted from the second light emitting element 122 and incident on the second translucent member 132A is taken out from the second surface 32 of the second translucent member 132A to the outside of the light emitting device 100A.

The light emitted from the first surface 31 and the light emitted from the second surface 32 spread as they travel toward the light guide plate 200. Of these lights, the components whose traveling direction has a large angle with respect to the Z direction in the drawing are before reaching the side surface 200c of the light guide plate 200, as schematically shown by the solid arrow Ry in FIG. Is incident on the first portion 141. That is, a part of the light emitted from the first surface 31 or the second surface 32 and directed to the light guide plate 200 is blocked by the first portion 141. The presence of such a component can cause a decrease in the optical coupling efficiency between the light emitting device 100A and the light guide plate 200.

In the present embodiment, as described with reference to FIG. 3, the surface of the first portion 141 has a first curved surface 41 between the first top portion 141t of the first portion 141 and the end portion of the first surface 31. It has a second curved surface 42 between the second top 142t and the end of the second surface 32. Therefore, in the ZX cross section, as compared with the case where the surface of the first portion 141 has a shape such that the surface of the first portion 141 rises sharply in the Z direction from the end portion of the first surface 31, the first surface 31 to the first top portion 141t The distance to X in the X direction increases. Further, in the ZX cross section, as compared with the case where the surface of the first portion 141 has a shape such that the surface of the first portion 141 rises sharply in the Z direction from the end portion of the second surface 32, the second surface 32 to the first top portion 141t The distance to X in the X direction increases.

By having the first portion 141 having such a shape, it becomes possible to allow light rays forming a larger angle with respect to the optical axis of the light emitting element to enter the light guide plate 200. Therefore, according to the embodiment of the present disclosure, it is possible to reduce the component of the light directed to the light guide plate 200 that is blocked by the first portion 141. Such a configuration makes it possible to more efficiently enter the light emitted from the first surface 31 or the second surface 32 onto the light guide plate 200, and the first surface 31 and the second surface 32 are from the light guide plate 200. Even when the distance is about 100 μm, it is possible to avoid a decrease in the optical coupling efficiency between the light emitting device 100A and the light guide plate 200. That is, the light from the first light emitting element 121 and the second light emitting element 122 can be used more effectively. The distance in the X direction from the first surface 31 to the first top portion 141t and the distance in the X direction from the second surface 32 to the first top portion 141t are 10 μm or more and 100 μm or less, more preferably 10 μm or more. It is 50 μm or less.

In particular, in this example, the light-reflecting member 140A is further attached to both ends in the X direction in the figure from the first surface 31 of the first translucent member 131A and the second surface 32 of the second translucent member 132A. Also has a second portion 142 and a third portion 143 projecting in the + Z direction. Therefore, direct contact of the first surface 31 and the second surface 32 with the light guide plate 200 can be prevented more reliably. As in the example shown in FIG. 3, by making the second top portion 142t and the third top portion 143t flat surfaces, when the second portion 142 and the third portion 143 are brought into contact with the light guide plate 200 or the like, the second portion It is possible to prevent stress from concentrating on 142 and the third portion 143, and an effect of avoiding damage to the second portion 142 and / or the third portion 143 can be expected.

Further, by appropriately adjusting the heights of the second portion 142 and the third portion 143, the light emitting device 100A is wired so that the first surface 31 and the second surface 32 face parallel to the side surface 200c of the light guide plate 200. It becomes easy to mount on the board 400. The height of the second portion 142 and the height of the third portion 143 are the same as the height of the first portion 141, from the end of the first surface 31 or the end of the second surface 32 to the second top in the ZX cross section. It can be defined as the distance along the Z direction to 142t or the third top 143t.

Since the surface of the second portion 142 has the concave third curved surface 43, the second portion 142 of the light traveling from the first surface 31 to the light guide plate 200 at a large angle with respect to the optical axis of the first light emitting element 121. It is possible to reduce the components that are obstructed by. Similarly, since the surface of the third portion 143 has a concave fourth curved surface 44, the light traveling from the second surface 32 to the light guide plate 200 at a large angle with respect to the optical axis of the second light emitting element 122 is the first. It is possible to reduce the components that are blocked by the three portions 143. As described above, even when the light reflecting member 140A is provided with the portions protruding in the + Z direction from the first surface 31 and the second surface 32, by providing the concave curved surface portions on their surfaces, they are formed. It is possible to suppress a decrease in light utilization efficiency in the backlight due to the provision of the portion of the light reflecting member 140A.

In addition, in FIGS. 1 to 4, as each shape of the first curved surface 41 to the fourth curved surface 44, an arc shape obtained by extracting a part of a perfect circle is illustrated. However, the shape of each of the first curved surface 41 to the fourth curved surface 44 in the ZX cross section is not limited to this example. The shape of the first curved surface 41 to the fourth curved surface 44 in the cross-sectional view is a shape in which a part of an ellipse or an ellipse is taken out, a shape including unevenness, a shape including a linear part in a part, or a shape. The shape may be a combination of these. Alternatively, as schematically shown in FIG. 5, at least one of the first curved surface 41 to the fourth curved surface 44 has a cross-sectional view shape (in an extreme case, it looks like a polygonal line) represented by a larger curvature. Shape).

(Second Embodiment)
FIG. 6 schematically shows a cross section of a light emitting device according to the second embodiment of the present disclosure. The light emitting device 100B shown in FIG. 6 has a first translucent member 131B instead of the first translucent member 131A and replaces the second translucent member 132A as compared with the above-mentioned light emitting device 100A. It has a second translucent member 132B.

Similar to the first embodiment, the first translucent member 131B and the second translucent member 132B have a first surface 31 and a second surface 32 exposed from the light reflecting member 140A, respectively. .. In this embodiment, each of the first surface 31 and the second surface 32 is concave in the ZX cross section.

The central portion of the first surface 31 of the first translucent member 131B is recessed in the −Z direction in the figure as compared with the end portion in the X direction in the figure. Similarly, the central portion of the second surface 32 of the second translucent member 132B is recessed in the −Z direction in the figure as compared with the end portion in the X direction in the figure. As will be described in more detail later in the examples, each of the first surface 31 and the second surface 32 has a concave shape in the ZX cross section, so that the spread of light in the ZX surface is reduced. That is, as a result of the light from the light emitting element gathering above the light emitting element, the influence of the effect of blocking the light by, for example, the first portion 141 is suppressed. This makes it possible to introduce light into the light guide plate more efficiently when applied to a backlight.

The shapes of the first surface 31 and the second surface 32 in the ZX cross section may be any shape recessed toward the first light emitting element 121 or the second light emitting element 122 as compared with the end portion, and are exemplified in FIG. It is not limited to the arc shape. The first surface 31 and / or the second surface 32 may include a convex portion in a part thereof in the ZX cross section.

FIG. 7 shows another example of the cross-sectional view shape of the first surface 31 and the second surface 32. Compared with the light emitting device 100B shown in FIG. 6, the light emitting device 100C shown in FIG. 7 has a light reflecting member 140C instead of the light reflecting member 140A.

The light reflective member 140C includes a first portion 141 having a first curved surface 41 and a second curved surface 42, a second portion 142 having a third curved surface, and a third portion 143 having a fourth curved surface 44. As schematically shown in FIG. 7, in this example, the first curved surface 41 of the first portion 141 of the light reflective member 140C, the first surface 31 of the first translucent member 131B, and the first surface 31 of the light reflective member 140C. The third curved surface 43 of the two portions 142 constitutes one curved surface. As a result, it is possible to prevent the light emitted from the first surface 31 from being blocked by the first curved surface 41 of the first portion 141 and the third curved surface 43 of the second portion 142.

Further, in this example, the second curved surface 42 of the first portion 141 of the light reflecting member 140C, the second surface 32 of the second translucent member 132B, and the fourth curved surface 44 of the third portion 143 of the light reflecting member 140C. Consists of one curved surface. As a result, it is possible to prevent the light emitted from the second surface 32 from being blocked by the second curved surface 42 of the first portion 141 and the fourth curved surface 44 of the third portion 143.

8 and 9 show other examples of cross-sectional views of the first portion 141, the second portion 142, and the third portion 143 of the light reflective member. The light emitting device 100D shown in FIG. 8 has a light reflecting member 140D, and the light emitting device 100E shown in FIG. 9 has a light reflecting member 140E. Similar to the example described with reference to FIG. 7, in the examples shown in FIGS. 8 and 9, the first curved surface 41 and the third curved surface 43 of the light reflecting members 140D and 140E are the first translucent member 131B. A single curved surface is formed with the first surface 31 of the above, and the second curved surface 42 and the fourth curved surface 44 of the light reflecting members 140D and 140E are a single curved surface with the second surface 32 of the second translucent member 132B. Consists of.

In the example shown in FIG. 8, the surface of the first portion 141 of the light reflective member 140D has a substantially flat side surface 41c between the first top portion 141t and the first curved surface 41. Further, the surface of the second portion 142 of the light reflecting member 140D has a substantially flat side surface 43c between the second top portion 142t and the third curved surface 43. In the configuration exemplified in FIG. 8, the side surface 41c and the side surface 43c are inclined with respect to the surface perpendicular to the upper surface 121a of the first light emitting element 121 so as to expand toward the upper side. As a result, while suppressing the end portion of the first surface 31 from coming into contact with an external component such as a light guide plate, it is possible to prevent the light emitted from the first surface 31 from being blocked by the side surface 41c or the side surface 43c. can.

Similarly, in this example, the surface of the first portion 141 has a generally flat side surface 42c between the first apex 141t and the second curved surface 42, and the surface of the third portion 143 has a third apex. It has a substantially flat side surface 44c between the 143t and the fourth curved surface 44. The side surface 42c and the side surface 44c are also inclined with respect to the surface perpendicular to the upper surface 122a of the second light emitting element 122 so as to expand toward the upper side. As a result, while suppressing the end portion of the second surface 32 from coming into contact with an external component such as a light guide plate, it is possible to prevent the light emitted from the second surface 32 from being blocked by the side surface 42c and the side surface 44c. can.

In the example shown in FIG. 9, the side surface 41c and the side surface 42c of the first portion 141 of the light reflecting member 140E, the side surface 43c of the second portion 142, and the side surface 44c of the third portion 143 are the upper surfaces of the first light emitting element 121. It is substantially perpendicular to the upper surface 122a of the 121a and the second light emitting element 122. Also in this case, it is possible to prevent the end portion of the first surface 31 and the end portion of the second surface 32 from coming into contact with an external component such as a light guide plate. As described above, the surfaces of the first portion 141, the second portion 142, and the third portion 143 of the light-reflecting member may have a shape such that a curved line and a straight line are combined in the ZX cross section.

FIG. 10 shows still another example of the cross-sectional view shape of the first surface 31 and the second surface 32. The light emitting device 100F shown in FIG. 10 has a first translucent member 131F instead of the first translucent member 131B as compared with the light emitting device 100B shown in FIG. Instead, it has a second translucent member 132F. The point that each of the first surface 31 and the second surface 32 exposed from the light reflecting member 140A is concave in the ZX cross section is the same as that of the light emitting device 100B.

As shown in FIG. 10, the central portion of the first surface 31 in the X direction in the figure is located at a lower position than both end portions. However, here, the first surface 31 is not curved but is composed of two inclined surfaces. The first surface 31 of the first translucent member 131F is a first light emitting element 121 toward the center from one end in the X direction in the figure (for example, the side close to the first portion 141 of the light reflective member 140A). Includes a first inclined surface 311 approaching the upper surface 121a of the first light emitting element 121 and a second inclined surface 312 approaching the upper surface 121a of the first light emitting element 121 from the other end toward the center. In other words, in this example, the shape of the first surface 31 in the ZX cross section is generally V-shaped.

In this example, the shape of the second surface 32 in the ZX cross section is also substantially V-shaped. That is, here, the second surface 32 of the second translucent member 132F is directed toward the center from one end in the X direction in the figure (for example, the side of the light reflective member 140A near the first portion 141). It includes a third inclined surface 323 that approaches the upper surface 122a of the second light emitting element 122, and a fourth inclined surface 324 that approaches the upper surface 122a of the second light emitting element 122 from the other end toward the center.

According to the study of the present inventor, even when the shape of the first surface 31 in the ZX cross section is V-shaped, the shape of the first surface 31 is curved in the X direction from the first surface 31 as in the case of a curved surface. The light emitted so as to spread easily gathers in the central portion of the first surface 31. That is, even if the shape of the first surface 31 in the ZX cross section is V-shaped, the light is blocked at the positions of the first curved surface 41 of the first portion 141 and the third curved surface 43 of the second portion 142. Can be expected to have the effect of suppressing. Similarly, by making the shape of the second surface 32 in the ZX cross section V-shaped, the light emitted from the second surface 32 so as to spread in the X direction can be easily collected in the central portion of the second surface 32. , It is possible to suppress the light from being blocked at the positions of the second curved surface 42 of the first portion 141 and the fourth curved surface 44 of the third portion 143.

Also in the light emitting device 100F, the shapes of the first surface 31 and the second surface 32 exposed from the light reflecting member are directed toward the light emitting element (first light emitting element 121 or second light emitting element 122) in the ZX cross section. It is said to have a concave shape. Therefore, similarly to the above-mentioned light emitting devices 100B to 100E, the spread of light in the ZX plane can be reduced, and the optical coupling efficiency with the light guide plate can be improved in application to the backlight.

In the present embodiment, until now, the first plane parallel to the upper surface (upper surface 121a or upper surface 122a) of the light emitting element and the direction in which the two light emitting elements are arranged (first direction, that is, the X direction in the figure) are perpendicular to each other. Attention is paid to the shapes of the first surface 31 and the second surface 32 in the cross section orthogonal to both the second plane (the first cross section, that is, the ZX cross section in the figure). As described with reference to FIGS. 6 to 10, the first surface 31 and the second surface 32 are concave in the ZX cross section. On the other hand, the shapes of the first surface 31 and the second surface 32 when the light emitting device according to the present embodiment is cut on the second plane (second cross section) perpendicular to the direction in which the two light emitting elements are arranged are different. Both are flat.

11 and 12 schematically show a cross section that appears when the light emitting device according to the second embodiment is cut perpendicularly to the direction in which the first light emitting element and the second light emitting element are arranged. FIG. 11 schematically shows a cross section when the light emitting device 100B shown in FIG. 6 is cut on the surface including the first light emitting element 121, and FIG. 12 is shown when the light emitting device 100B is cut on the surface including the second light emitting element 122. The cross section is schematically shown. That is, FIGS. 11 and 12 show the XI-XI cross section and the XII-XII cross section of FIG. 6, respectively.

As shown in FIG. 11, the shape of the first surface 31 is flat in the YZ cross section. As shown in FIG. 12, the shape of the second surface 32 is also flat in the YZ cross section. As described above, in the present embodiment, the shape of the first surface 31 and the second surface 32 in the ZX cross section (first cross section) is concave, whereas the YZ cross section (second cross section) orthogonal to the ZX cross section is formed. ), The shapes of the first surface 31 and the second surface 32 are flat. As a result, even if the first portion 141, the second portion 142, or the third portion 143 of the light reflective member 140A is damaged due to the stress when it comes into contact with the light guide plate or the like, the first surface 31 and the first surface 31 and the third portion 143 are damaged. Since contact between the outer edge of the second surface 32 extending in the X direction and the light guide plate can be avoided, changes in the light distribution characteristics of the light emitting device before and after the damage of the light reflecting member 140A are minimized. be able to. The point that the shapes of the first surface 31 and the second surface 32 in the YZ cross section (second cross section) are flat is the same in the first embodiment.

33 and 34 are a six-view view and a perspective view thereof showing another example of the light emitting device according to the second embodiment of the present disclosure. In addition, (a) shown in each of FIGS. 33 and 34 is a front view, (b) is a left side view, (c) is a right side view, (d) is a plan view, (e) is a bottom view, (f). ) Is a rear view, (g) is a perspective view of the front surface, a plane and the right side surface, and (h) is a perspective view of the back surface, the bottom surface and the left side surface. Similar to the example described with reference to FIG. 7, in the examples shown in FIGS. 33 and 34, the first curved surface 41 and the third curved surface 43 of the light reflecting members 140L and 140M are the first translucent member 131B. A single curved surface is formed with the first surface 31 of the above, and the second curved surface 42 and the fourth curved surface 44 of the light reflecting members 140L and 140M are single curved surfaces with the second surface 32 of the second translucent member 132B. Consists of. Further, the light emitting device 100L shown in FIG. 33 and the light emitting device 100M shown in FIG. 34 have widths d1 and d2 of at least the first top portions 141t in the direction in which the first surface 31 and the second surface 32 in the front view are arranged. different. Specifically, the width d2 of the first top portion 141t of the light emitting device 100M is wider than the width d1 of the first top portion 141t of the light emitting device 100L. For example, the width d2 of the first top portion 141t of the light emitting device 100M is preferably about 40% or more and 60% or less with respect to the width d3 from the first surface 31 to the second surface 32, and more preferably 45. It is about% or more and 55% or less, and it is possible to further suppress that the light emitted from the first surface 31 and the second surface 32 is blocked by the first portion 141.

(Other variants)
Next, various modifications of the light emitting device will be described. Here, the light emitting device 100B shown in FIG. 6 will be described as an example, but with respect to other examples described so far (light emitting device 100A, light emitting device 100C to light emitting device 100F, light emitting device 100L, and light emitting device 100M). Needless to say, similar modifications can be applied. Of course, it is also possible to combine two or more of the modifications described below.

FIG. 13 shows an example of a light emitting device further including a first wavelength conversion member and a second wavelength conversion member. Compared with the light emitting device 100B shown in FIG. 6, the light emitting device 100G shown in FIG. 13 has a first wavelength conversion member 161 located between the first translucent member 131B and the first light emitting element 121, and a second light emitting device. Further, it has a second wavelength conversion member 162 located between the translucent member 132B and the second light emitting element 122. In the configuration exemplified in FIG. 13, the light reflective member 140A is also in contact with the side surface 161c of the first wavelength conversion member 161 and the side surface 162c of the second wavelength conversion member 162.

The first wavelength conversion member 161 and the second wavelength conversion member 162 contain a base material, particles of a phosphor, and the like, and the phosphor in the first wavelength conversion member 161 is emitted from the first light emitting element 121. It absorbs at least a part of the light and emits light having a wavelength different from the wavelength of the light from the first light emitting element 121. Similarly, the phosphor in the second wavelength conversion member 162 absorbs at least a part of the light emitted from the second light emitting element 122 and emits light having a wavelength different from the wavelength of the light from the second light emitting element 122. Emit.

A typical example of the first light emitting element 121 and the second light emitting element 122 is an LED that emits blue light. In this case, the first wavelength conversion member 161 and the second wavelength conversion member 162 can perform wavelength conversion of a part of the incident blue light to emit, for example, yellow light. According to such a configuration, white light is obtained by mixing the blue light that has passed through the translucent member and the yellow light emitted from the phosphor contained in the translucent member.

FIG. 14 schematically shows an example in which a single translucent member is arranged above the first light emitting element and the second light emitting element. Compared with the light emitting device 100G shown in FIG. 13, the light emitting device 100H shown in FIG. 14 replaces the first translucent member 131B and the second translucent member 132B with the upper surface 121a and the first light emitting element 121. 2 It has a translucent member 130 that collectively covers the upper surface 122a of the light emitting element 122.

In each of the above examples, the first translucent member and the first translucent member are above the first light emitting element 121 and the second light emitting element 122, corresponding to the case where the light emitting device has the first light emitting element 121 and the second light emitting element 122. 2 Translucent members are arranged respectively. However, the present invention is not limited to these examples, and as illustrated in FIG. 14, a single translucent member 130 is provided so as to cover both the upper surface 121a of the first light emitting element 121 and the upper surface 122a of the second light emitting element 122. It may be provided in the light emitting device 100H. Further, as illustrated in FIG. 14, the first wavelength conversion member 161 and the second translucent member 162 may be arranged above the first light emitting element 121 and the second light emitting element 122, respectively , or the first light emitting element may be arranged. A single wavelength conversion member 163 may be arranged so as to cover both the upper surface 121a of the 121 and the upper surface 122a of the second light emitting element 122.

In the example shown in FIG. 14, a plurality of portions of the upper surface 130a of the translucent member 130 are exposed from the light reflective member 140A. Of these portions, the portion exposed from the light reflecting member 140A above the first light emitting element 121 is the first surface 31, and is exposed from the light reflecting member 140A above the second light emitting element 122. The portion is the second surface 32. In this example, the first surface 31 and the second surface 32 are concave curved surfaces.

By arranging the translucent member 130 above both the first light emitting element 121 and the second light emitting element 122, the light from the first light emitting element 121 and the light from the second light emitting element 122 are transmitted. It is mixed inside the optical member 130. This makes it possible to extract more uniform light from the first surface 31 and the second surface 32.

FIG. 15 shows still another modification of the light emitting device. In each of the above examples, the light emitting device has a substrate 110 on which the first light emitting element 121 and the second light emitting element 122 are mounted. On the other hand, the light emitting device 100K shown in FIG. 15 has a wiring layer 160 located below the first light emitting element 121 and the second light emitting element 122 instead of the substrate 110.

In the example shown in FIG. 15, the lower surface 24b of the electrode 24 of the first light emitting element 121 and the second light emitting element 122 is exposed from the lower surface 140b of the light reflecting member 140A. The wiring layer 160 is formed on the lower surface 140b of the light reflective member 140A and is electrically connected to the electrode 24. FIG. 15 is an example in which the first light emitting element 121 and the second light emitting element 122 are electrically connected in series by the wiring layer 160. As in this example, the substrate 110 may be omitted from the light emitting device.

FIG. 35 schematically shows an example in which a single translucent member and a single wavelength conversion member are arranged above the first light emitting element and the second light emitting element. Compared with the light emitting device 100H shown in FIG. 14, the light emitting device 100N shown in FIG. 35 replaces the first wavelength conversion member 161 and the second wavelength conversion member 162 with the upper surface 121a of the first light emitting element 121 and the second light emitting device. It has a wavelength conversion member 163 that collectively covers the upper surface 122a of the element 122. Further, the light-reflecting member 140A in the light-emitting device 100N does not have the first portion 141, and the light-transmitting member 130 is light-reflecting above the region between the first light-emitting element 121 and the second light-emitting element 122. It is exposed from the member 140A.

As in the example shown in FIG. 35, the entire upper surface 130a of the translucent member 130 may be exposed from the light reflective member 140A, or a part of the upper surface 130a of the translucent member 130, for example, in the X direction. The end portion may be covered with the light reflecting member 140A. The upper surface 130a of the translucent member 130 has a concave curved surface, and the light emitted from the upper surface 130a of the translucent member 130 so as to spread in the X direction tends to collect in the central portion of the upper surface 130a. It is possible to prevent light from being blocked at the positions of the third curved surface 43 of the second portion 142 and the fourth curved surface 44 of the third portion 143.

Further, by arranging the translucent member 130 and the wavelength conversion member 163 above both the first light emitting element 121 and the second light emitting element 122, the light from the first light emitting element 121 and the second light emission can be obtained. The light from the element 122 is mixed inside the translucent member 130 and the wavelength conversion member 163. This makes it possible to extract more uniform light from the upper surface 10a of the translucent member 130.

Hereinafter, details of each member in the light emitting device will be described.

[Board 110]
The substrate 110 is a support member on which the first light emitting element 121 and the second light emitting element 122 are mounted. Corresponding to the mounting of the first light emitting element 121 and the second light emitting element 122 along the first direction (X direction in the figure), the upper surface 110a of the substrate 110 is typically in the Y direction in the figure. It has a long rectangular shape in the X direction in comparison. As shown in FIGS. 1 to 3, the substrate 110 has a substantially rectangular parallelepiped shape as a whole.

In the configuration exemplified in FIG. 3, the substrate 110 includes a base material 10 having an upper surface and a lower surface, a first wiring 11, a second wiring 12, and a conductive member 15 arranged inside the base material 10. The upper surface of the base material 10 is included in the upper surface 110a of the substrate 110, and the lower surface of the base material 10 is included in the lower surface 110b located on the opposite side of the upper surface 110a in the substrate 110. The first wiring 11 and the second wiring 12 are located on the upper surface 110a side and the lower surface 110b side of the substrate 110, respectively. The conductive member 15 penetrates the base material 10 and electrically connects the first wiring 11 and the second wiring 12 to each other.

The base material 10 is a support member having a substantially rectangular parallelepiped shape in which the first wiring 11 and the second wiring 12 are arranged. An example of the material of the base material 10 is an insulator such as resin, ceramics or glass. The base material 10 may be formed of a composite material such as a fiber reinforced resin, and for example, a glass epoxy substrate may be applied to the base material 10. Epoxy, bismaleimide triazine (BT), polyimide, or the like can be used as the base material of the base material 10. As the ceramics, aluminum oxide, aluminum nitride, zirconium oxide, zirconium nitride, titanium oxide, titanium nitride, or a mixture of one or more of these can be applied. Among these ceramics, it is advantageous to use a material having a linear expansion coefficient close to that of the light emitting element as the material of the base material 10.

From the viewpoint of the strength of the substrate 110, it is beneficial that the thickness of the substrate 10 in the Z direction is 0.05 mm or more, more preferably 0.2 mm or more. When the thickness of the base material 10 in the Z direction is 0.6 mm or less, it is advantageous for reducing the thickness of the light emitting device. The thickness of the base material 10 in the Z direction is preferably 0.5 mm or less, more preferably 0.4 mm or less.

As illustrated in FIGS. 2, 11 and 12, each of the substrate 10s may have one or more recesses 10R that open into the bottom surface and the bottom surface 10 m of the substrate 10. Here, the bottom surface 10 m of the base material 10 is a surface located between the upper surface and the lower surface of the base material 10 and is a surface facing the upper surface of the wiring board in application to a backlight.

The substrate 110 further includes a third wiring 13 that covers the inner wall of the recess 10R. As shown in FIGS. 11 and 12, the third wiring 13 is arranged on the surface of the base material 10 continuously with the second wiring 12 on the lower surface 110b of the substrate 110, so that the second wiring 12 and electricity can be obtained. Have a connection. In application to the backlight, as shown in FIG. 4, the light emitting device 100G can be mounted on the wiring board by arranging the solder 90 so as to be located in these recesses 10R.

The materials of the first wiring 11, the second wiring 12, and the third wiring 13 include copper, iron, nickel, tungsten, chromium, aluminum, silver, platinum, gold, titanium, palladium, rhodium, or one or more of them. An alloy containing rhodium can be used. From the viewpoint of heat dissipation, it is advantageous to apply copper or a copper alloy to the material of these wirings. The first wiring 11, the second wiring 12, and the third wiring 13 may be formed on the base material 10 in the form of a single-layer film, or may be formed on the base material 10 in the form of a laminated film. When the outermost surface of these wirings is made of silver, platinum, aluminum, rhodium or gold, or an alloy containing one or more of these, high light reflectivity and good wettability to solder and the like are obtained. It is useful because it can be obtained.

As the material of the conductive member 15, the same material as that of the first wiring 11, the second wiring 12, or the third wiring 13 can be applied. The conductive member 15 may occupy the entire inside of the through hole formed in the base material 10, or may be a part of the inside of the through hole, for example, a conductive film arranged on the surface of the through hole. .. Further, the region surrounded by the conductive film may be filled with an insulating material such as an epoxy resin.

FIG. 16 shows an exemplary appearance of the light emitting device 100G when viewed from the lower surface 110b side of the substrate 110, and FIG. 17 shows an exemplary appearance of the light emitting device 100G when viewed from the bottom surface 10 m side of the base material 10. Is shown. In the example shown in FIG. 16, each opening of the recess 10R has a semicircular shape. These recesses 10R can be arranged symmetrically with respect to the center of the substrate 10 in the X direction of the figure. As schematically shown in FIG. 16, here, the conductive member 15 is formed at a position that does not overlap with the recess 10R.

In the configuration exemplified in FIG. 16, the substrate 110 further has one or more insulating layers 18. The insulating layer 18 is formed of a thermosetting resin or a thermoplastic resin and covers a part of each of the plurality of second wirings 12 located on the lower surface of the base material 10. By arranging such an insulating layer 18 on the lower surface 110b side of the substrate 110, the effect of preventing a short circuit between the second wirings 12 can be obtained.

With reference to FIG. 17, attention is paid to the shape of the opening of each recess 10R at the bottom surface 10 m of the base material 10. As shown in FIG. 17, the recess 10R may have a shape in which the depth in the Z direction is increased in the central portion as compared with both ends in the X direction in the figure. As shown in FIGS. 11 and 12, the recess 10R may have a shape in which the depth along the Z direction in the figure increases as the bottom surface approaches 10 m.

[First light emitting element 121 and second light emitting element 122]
The first light emitting element 121 and the second light emitting element 122 are semiconductor elements that emit light by supplying an electric current. The basic structures of the first light emitting element 121 and the second light emitting element 122 may be generally common. Hereinafter, the structure of the first light emitting element 121 will be mainly described, and the description of the second light emitting element 122 will be omitted.

As described with reference to FIG. 3, the first light emitting element 121 has an electrode 24 located on the lower surface opposite to the upper surface 121a. The electrode 24 includes a set of a positive electrode and a negative electrode. Examples of materials for the electrode 24 are gold, silver, tin, platinum, rhodium, titanium, aluminum, tungsten, palladium, nickel, or alloys containing one or more of these. The first light emitting element 121 is mounted on the substrate 110 by connecting and fixing the electrode 24 to the first wiring 11 of the substrate 110 by a joining member such as solder.

The first light emitting device 121 further has a semiconductor laminated structure including an n-type semiconductor layer and a p-type semiconductor layer, and an active layer sandwiched between them. The semiconductor laminated structure can be formed on a support substrate such as sapphire or gallium nitride. When the first light emitting element 121 includes a support substrate as a part thereof, the upper surface of the support substrate constitutes the upper surface 121a of the first light emitting element 121. The above-mentioned electrode 24 is provided on the surface of the semiconductor laminated structure opposite to the support substrate. The electrode 24 has an electrical connection with the semiconductor laminated structure and has a function of supplying a predetermined current to the semiconductor laminated structure.

The semiconductor laminated structure may include a nitride semiconductor (In _x Ally Ga _{1-xy N} , 0 ≦ x, 0 ≦ y, x + y ≦ 1) capable of emitting light in the ultraviolet to visible range. The emission peak wavelength may be different between the first light emitting element 121 and the second light emitting element 122. For example, a semiconductor laminated structure that mainly emits blue light may be applied to the first light emitting element 121, and a semiconductor laminated structure that mainly emits green light may be applied to the second light emitting element 122.

[First translucent member 131B, second translucent member 132B]
The first translucent member 131B and the second translucent member 132B are substantially plate-shaped members arranged above the first light emitting element 121 and above the second light emitting element 122, respectively. The first translucent member 131B and the second translucent member 132B function as a protective layer for the first light emitting element 121 and the second light emitting element 122.

The first translucent member 131B and the second translucent member 132B are formed of, for example, a resin material using a silicone resin or the like as a base material. Typically, the first translucent member 131B has a transmittance of 60% or more with respect to the light having the emission peak wavelength of the first light emitting element 121. The same can be said for the second translucent member 132B. From the viewpoint of effective use of light, it is beneficial that the transmittance of the translucent member (first translucent member 131B, second translucent member 132B) at the emission peak wavelength of the light emitting element is 70% or more. It is more beneficial if it is 80% or more.

In addition to the silicone resin, the base material of the first translucent member 131B and the second translucent member 132B may be, for example, a silicone-modified resin, an epoxy resin, a phenol resin, a polycarbonate resin, an acrylic resin, a polymethylpentene resin or a poly. Norbornen resin, or a material containing two or more of these, may be applied. It is also possible to select glass as the material for the first translucent member 131B and the second translucent member 132B.

By dispersing a light diffusing material having a refractive index different from that of the base material in the base material, the first translucent member 131B and the second translucent member 132B may be provided with a light diffusing function. As the light diffusing material, for example, particles of a resin having a refractive index different from that of the base material, particles of silicon oxide, aluminum oxide, zirconium oxide, zinc oxide, or the like can be used. Scattering in the translucent member can be increased by using nanoparticles having a particle size of 1 nm or more and 100 nm or less as defined in D ₅₀ as the light diffusing material dispersed in the base material.

As described above, in the embodiment of the present disclosure, at least a part of the upper surface 131a of the first translucent member 131B and at least a part of the upper surface 132a of the second translucent member 132B are exposed from the light reflecting member 140A. Will be done. That is, the first surface 31 of the first translucent member 131B is a part or all of the upper surface 131a, and the second surface 32 of the second translucent member 132B is a part or all of the upper surface 132a. Here, the first surface 31 and the second surface 32 are concave in the first cross section.

[First wavelength conversion member 161 and second wavelength conversion member 162]
The first wavelength conversion member 161 is a substantially plate-shaped member located between the upper surface 121a of the first light emitting element 121 and the lower surface 131b of the first translucent member 131B. Similarly, the second wavelength conversion member 162 is a substantially plate-shaped member located between the upper surface 122a of the second light emitting element 122 and the lower surface 132b of the second translucent member 132B.

The first wavelength conversion member 161 and the second wavelength conversion member 162 contain a base material, particles of a phosphor dispersed in the base material, and the like. Examples of the base material of the first wavelength conversion member 161 and the second wavelength conversion member 162 are silicone resin, modified silicone resin, epoxy resin, modified epoxy resin, urea resin, phenol resin, polycarbonate resin, trimethylpentene resin, and polynorbornene resin. , Acrylic resin, urethane resin or fluororesin, or a resin containing two or more of these. It is also possible to select glass as the base material of the first wavelength conversion member 161 and the second wavelength conversion member 162. From the viewpoint of efficiently introducing light into the first translucent member 131B, it is beneficial that the material of the first wavelength conversion member 161 has a lower refractive index than the material of the first translucent member 131B. Similarly, it is beneficial that the material of the second wavelength conversion member 162 has a lower refractive index than the material of the second translucent member 132B. The first wavelength conversion member 161 and the second wavelength conversion member 162 may be a single layer, or may include, for example, a laminated structure of a plurality of resin layers.

A known material can be applied to the phosphor dispersed in the first wavelength conversion member 161 and the second wavelength conversion member 162. Examples of the phosphor include an yttrium aluminum garnet phosphor (for example, Y ₃ (Al, Ga) ₅ O ₁₂ : Ce) and a terbium aluminum garnet phosphor (for example, Lu ₃ (Al, Ga)). ₅ O ₁₂ : Ce), terbium aluminum garnet phosphor (eg, Tb ₃ (Al, Ga) ₅ O ₁₂ : Ce), β-sialon phosphor (eg, (Si, Al) ₃ (O, N)) ₄ : Eu), α-sialon phosphor (eg, Mz (Si, Al) ₁₂ (O, N) ₁₆ (where 0 <z≤2, M is Li, Mg, Ca, Y, and La and Ce. Phosphoric elements excluding)), nitride-based phosphors such as CASN-based phosphors (eg, CaAlSiN ₃ : Eu) or SCASN-based phosphors (eg, (Sr, Ca) AlSiN ₃ : Eu), KSF-based phosphors (eg, KSF-based phosphors ( For example, a fluoride-based phosphor such as K ₂ SiF ₆ : Mn) or an MGF-based phosphor (for example, 3.5 MgO, 0.5 MgF ₂ , GeO ₂ : Mn), a CCA-based phosphor (for example, (Ca, Sr)). ) ₁₀ (PO ₄ ) _{6 Cl2} : Eu) can be used. The phosphor may be a quantum dot phosphor. One of these fluorescent substances may be contained alone in the wavelength conversion member (first wavelength conversion member 161 or second wavelength conversion member 162), or two of these fluorescent substances may be contained. A combination of seeds or more may be contained.

For example, according to the configuration shown in FIG. 13, the wavelength conversion member is interposed between the light emitting element and the translucent member, so that the light from the light emitting element is transferred to the translucent member via the wavelength conversion member. It will be possible to introduce it. As a result, the light after color mixing can be diffused inside the translucent member, and for example, white light having suppressed luminance unevenness can be taken out from the first surface 31 or the second surface 32 to the outside of the light emitting device 100G. According to the configuration in which the light transmitted through the first wavelength conversion member 161 and the light transmitted through the second wavelength conversion member 162 are introduced into a single translucent member 130 as in the light emitting device 100H shown in FIG. The light transmitted through the first wavelength conversion member 161 and the light transmitted through the second wavelength conversion member 162 can be mixed in the translucent member 130, which is advantageous for uniform light.

The phosphor to be dispersed in the base material may be different between the first wavelength conversion member 161 and the second wavelength conversion member 162. Further, the first wavelength conversion member 161 may be provided with a light diffusion function by dispersing a material having a refractive index different from that of the base material in the material of the first wavelength conversion member 161. Similarly, the second wavelength conversion member 162 may be provided with a light diffusion function by dispersing a material having a refractive index different from that of the base material in the material of the second wavelength conversion member 162. For example, particles such as titanium dioxide and silicon oxide may be dispersed in the base material of the first wavelength conversion member 161 and / or the second wavelength conversion member 162.

[First joining member 151, second joining member 152]
The first joining member 151 and the second joining member 152 each have at least a portion located on a part of the side surface 121c of the first light emitting element 121 and a portion located on a part of the side surface 122c of the second light emitting element 122, respectively. It is a translucent member including (see FIG. 3). The first wavelength conversion member 161 and the second wavelength conversion member 162 described above are joined to the first light emitting element 121 and the second light emitting element 122 by the first joining member 151 and the second joining member 152, respectively. Since the details of the second joining member 152 are substantially the same as those of the first joining member 151, the details of the first joining member 151 will be mainly described below, and the details of the second joining member 152 will be omitted.

The first joining member 151 includes a portion located between the side surface 121c of the first light emitting element 121 and the light reflecting member 140A. By providing the first joining member 151, a part of the light emitted from the side surface 121c among the light emitted by the first light emitting element 121 can be incident on the first joining member 151. The light incident on the first joining member 151 is reflected toward the first translucent member 131B at the position of the outer surface 151c of the first joining member 151, and is reflected to the outside of the light emitting device 100G via the first translucent member 131B. It emits toward. Therefore, by providing the first joining member 151, the light extraction efficiency can be improved.

As the material of the first joining member 151, a resin material containing a transparent resin as a base material can be used. As the base material of the first joining member 151, for example, the same material as the base material of the first translucent member 131B can be used. The first joining member 151 may have a light diffusing function by dispersing a light diffusing material having a refractive index different from that of the base material.

The shape of the outer surface 151c in cross-sectional view is not limited to the linear shape as shown in FIG. The shape of the outer surface 151c in the cross-sectional view may be a polygonal line shape, a curved shape convex in the direction approaching the first light emitting element 121, a curved shape convex in the direction away from the first light emitting element 121, or the like. When the shape of the outer surface 151c of the first bonding member 151 in a cross-sectional view is a curved shape that is convex in a direction away from the first light emitting element 121, the first bonding member 151 is emitted from the side surface 121c of the first light emitting element 121. More of the light that has passed can be more efficiently guided to the first translucent member 131B side. Therefore, the light extraction efficiency can be improved more advantageously.

[Light reflective member 140A]
The light reflective member 140A is formed on the upper surface 110a of the substrate 110 so as to surround the first light emitting element 121 and the second light emitting element 122, and the first surface 31 and the second light transmissive of the first translucent member 131B. Except for the second surface 32 of the member 132B, it covers the structure on the upper surface 110a of the substrate 110. In the example shown in FIG. 13, the light-reflecting member 140A is the first wavelength conversion member 161 in addition to the side surface 131c of the first translucent member 131B and the side surface 132c of the second translucent member 132B (see FIG. 3). It is also in contact with the side surface 161c of the above and the side surface 162c of the second wavelength conversion member 162.

The light reflective member 140A is formed of, for example, a resin material in which a light diffusing material is dispersed. Examples of the base material of the light reflective member 140A include silicone resin, modified silicone resin, epoxy resin, urea resin, polycarbonate resin, phenol resin, acrylic resin, urethane resin, fluororesin or modified resins thereof, or these modified resins. A resin containing two or more kinds can be used. As the light diffusing material, particles of an inorganic material or an organic material having a higher refractive index than the base material can be used. Examples of light diffusing materials include titanium oxide, magnesium oxide, zirconium dioxide, potassium titanate, aluminum oxide, aluminum nitride, boron nitride, murite, niobium oxide, barium sulfate, silicon oxide, and various rare earth oxides (eg, yttrium oxide, etc.). It is a particle such as gadolinium oxide). It is beneficial if the light-reflecting member 140A is white.

As used herein, the term "light reflectivity" means that the reflectance of the light emitting element (first light emitting element 121 or second light emitting element 122) at the emission peak wavelength is 60% or more. It is more beneficial when the reflectance of the light reflecting member 140A at the emission peak wavelength of the light emitting element is 70% or more, and it is even more beneficial when the reflectance is 80% or more.

The light reflective member 140A covers the surface of the first translucent member 131B and the surface of the second translucent member 132B, except for the first surface 31 and the second surface 32. A part of the light reflective member 140A may be located on a part of the upper surface 131a of the first translucent member 131B and / or a part of the upper surface 132a of the second translucent member 132B. In the configuration exemplified in FIG. 14, the first portion 141 of the light-reflecting member 140A is on the upper surface of the light-transmitting member 130 of the light-reflecting member 140A and is sandwiched between the first surface 31 and the second surface 32. It is a part that has been removed.

For example, as shown in FIG. 13, a part of the light reflecting member 140A may be located between the first light emitting element 121 and the substrate 110 and also between the second light emitting element 122 and the substrate 110. By arranging the light reflecting member 140A between the first light emitting element 121 and the substrate 110 and between the second light emitting element 122 and the substrate 110, it is possible to suppress the emission of light from the lower surface side of the light emitting element, and the light can be suppressed. The effect of improving the utilization efficiency of is obtained.

[Wiring layer 160]
In the example shown in FIG. 15, the light emitting device 100K has a wiring layer 160 provided on the lower surface 140b of the light reflecting member 140A instead of having the substrate 110. The wiring layer 160 is obtained by forming the light reflective member 140A, for example, forming a conductive film such as a metal film on the lower surface 140b, and patterning the conductive film. As the material of the wiring layer 160, the same materials as those of the first wiring 11, the second wiring 12, and the third wiring 13 can be applied. The wiring layer 160 may be formed in the form of a single-layer film on the lower surface 140b of the light-reflecting member 140A, or may be formed in the form of a laminated film.

(Example manufacturing method of light emitting device)
Next, with reference to the drawings, an outline of an exemplary manufacturing method of the light emitting device according to the embodiment of the present disclosure will be described. Here, an exemplary manufacturing method of the light emitting device 100G shown in FIG. 13 will be described.

First, an assembly substrate 110X having a first conductive layer 11L on the upper surface 110a and a second conductive layer 12L on the lower surface 110b on the opposite side of the upper surface 110a is prepared. 18 and 19 schematically show an example of the appearance of the assembled substrate 110X seen from the upper surface 110a side and an example of the appearance of the assembled substrate 110X seen from the lower surface 110b side, respectively. In this example, the conductive member 15 connecting the first conductive layer 11L and the second conductive layer 12L is provided at a plurality of positions of the collective substrate 110X.

The collective substrate 110X can be obtained by forming a conductive film on both surfaces of a plate-shaped insulating base material by plating or the like, and then patterning the conductive film. As shown in FIG. 18, the first conductive layer 11L includes a plurality of lands 11p. In the configuration exemplified in FIG. 19, a plurality of hole portions 110h formed by using a drill, a laser, or the like are provided on the lower surface 110b of the assembly substrate 110X, and the second conductive layer 12L is formed of these hole portions 110h. It is also formed on the inner surface. Here, the insulating layer 18 is formed on the lower surface 110b side of the collective substrate 110X so as to cover a part of the second conductive layer 12L.

Next, the first light emitting element 121 and the second light emitting element 122 are prepared. Here, a plurality of sets of the first light emitting element 121 and the second light emitting element 122 are prepared, and as shown in FIG. 20, these sets are placed on the upper surface 110a side of the assembly substrate 110X along the X direction and the Y direction in the figure. Implement in two dimensions. At this time, as shown in FIG. 21, the electrodes 24 of the first light emitting element 121 and the second light emitting element 122 are joined to the plurality of lands 11p of the first conductive layer 11L by the conductive adhesive member 40. Examples of the conductive adhesive member 40 include bumps such as gold, silver and copper, conductive paste which is a mixture of metal powder such as gold, silver, copper, platinum and aluminum and a resin binder, or tin-silver-. Copper (SAC) -based or tin-bismuth (SnBi) -based solder can be used.

Next, a translucent adhesive is applied to the upper surface 121a of the first light emitting element 121 and the upper surface 122a of the second light emitting element 122, and a plurality of laminated sheet pieces each including a phosphor layer and a translucent layer are attached thereto. Join to the top surface. By curing the adhesive, the first joining member 151 and the second joining member 152 can be formed from the adhesive, and as shown in FIG. 22, the first wavelength conversion member 161 and the first translucent member 131X are combined with the first light emitting element. It can be arranged above the upper surface 121a of 121. Similarly, the second wavelength conversion member 162 and the second translucent member 132X can be arranged above the upper surface 122a of the second light emitting element 122. For the laminated sheet piece, for example, a resin material containing phosphor particles is applied onto a translucent resin sheet, and then the resin material is cured to obtain a laminated sheet, and the laminated sheet is cut to a predetermined size. It is obtained by.

Next, as shown in FIG. 23, a plurality of sets of the first light emitting element 121 and the second light emitting element 122 are formed by applying the material of the light reflecting member 140A on the upper surface 110a of the collective substrate 110X and curing the material. It forms a light-reflecting resin layer 140X to cover. At this time, the light-reflecting resin layer 140X has a thickness that covers the entire first translucent member 131X and the second translucent member 132X.

Next, for example, by cutting using a rotating wheel (blade), a part of the light-reflecting resin layer 140X, a part of the first translucent member 131X, and the second translucency along the Y direction in the figure. A part of the member 132X is removed (see FIG. 24). At this time, as schematically shown in FIG. 25, by moving the blade BL a plurality of times along the Y direction in the figure, the upper surfaces of the first translucent member 131X and the second translucent member 132X are concave. It is possible to do. Further, by adjusting the shape of the cutting edge of the blade BL, it is possible to obtain the surface shape of the light-reflecting resin layer 140X so as to include a curved portion in a cross-sectional view. By this cutting step, the first translucent member 131B and the second translucent member 132B can be formed from the first translucent member 131X and the second translucent member 132X, respectively.

After that, the assembly substrate 110X and the light-reflecting resin layer 140X are cut at positions between the plurality of sets of the first light emitting element 121 and the second light emitting element 122 (positions indicated by two dashed lines in FIGS. 18 to 20). .. By this step of individualization, the substrate 110 and the light-reflecting member 140A can be formed from the collective substrate 110X and the light-reflecting resin layer 140X, respectively. Further, the first wiring 11, the second wiring 12, and the third wiring 13 can be formed from the first conductive layer 11L and the second conductive layer 12L. The third wiring 13 corresponds to a portion of the second conductive layer 12L that covers the inner side surface of the hole portion 110h of the assembly substrate 110X. By the above steps, a plurality of light emitting devices 100G can be obtained.

The effect of the shape of the light reflecting member and the shape of the translucent member of the light emitting device on the light coupling efficiency with the light guide plate was evaluated by the light ray tracing method. In the following, a simulation was performed using an optical analysis tool manufactured by Cybernet Systems Co., Ltd.

(Example 1)
As a sample of Example 1, assuming a light emitting device having the same configuration as the light emitting device 100A shown in FIGS. 1 to 3, a state in which the first surface 31 and the second surface 32 of the light emitting device are opposed to the light guide plate. The ray distribution was obtained by simulation. However, in the following, the first portion 141, the second portion 142, and the third portion 143 of the light reflecting member 140A have a shape that rises vertically from the first surface 31 or the second surface 32 in the first cross section. The simulation is executed assuming that it is.

In the sample of Example 1, the height H1 of the light reflecting member 140A was assumed to be 0.02 mm. Here, a flat surface is assumed as the shape of the first surface 31 of the first translucent member 131A and the second surface 32 of the second translucent member 132A. Therefore, in the simulation for the sample of Example 1, the distance between the translucent member and the light guide plate is 0.02 mm.

Other basic settings in the simulation are as follows.
Wavelength of emitted light from light emitting elements 121 and 122: 455 nm
Refractive index of sapphire substrate in light emitting elements 121 and 122: 1.77
Refractive index of the semiconductor laminated structure in the light emitting devices 121 and 122: 2.383
Refractive index of joining members 151 and 152: 1.47
Refractive index of wavelength conversion members 161 and 162: 1.5
Refractive index of light reflective member 140A: 1.5
Light guide plate material: Acrylic resin Number of light rays: 3 million

(Example 2)
Similar to the sample of Example 1, except that the first surface 31 and the second surface 32 are curved surfaces recessed toward the first light emitting element 121 and the second light emitting element 122 in the first cross section, respectively. A simulation was performed for the sample of Example 2. The distance along the Z direction of the figure from the end to the center of the first surface 31 and the distance along the Z direction of the figure from the end to the center of the second surface 32 are both 0.02 mm. And said. That is, in the sample of Example 2, the distance along the Z direction in the figure from the central portion of the first surface 31 to the light guide plate and the distance along the Z direction in the figure from the central portion of the second surface 32 to the light guide plate. Is 0.04 mm in each case.

(Example 3)
The same applies to the sample of Example 3 except that the heights of the first portion 141, the second portion 142, and the third portion 143 of the light reflecting member 140A are 0.04 mm. A simulation was performed. That is, in the sample of Example 3, the distance along the Z direction in the figure from the central portion of the first surface 31 to the light guide plate and the distance along the Z direction in the figure from the central portion of the second surface 32 to the light guide plate. Is 0.06 mm in each case.

(Example 4)
As a sample of Example 4, a simulation was performed assuming a light emitting device having the same configuration as the light emitting device 100F shown in FIG. That is, in the sample of Example 4, the shape of the first surface 31 and the shape of the second surface 32 in the first cross section are assumed to be V-shaped. The distance along the Z direction of the figure from the end to the center of the first surface 31 and the distance along the Z direction of the figure from the end to the center of the second surface 32 are 0.04 mm. did. That is, in the sample of Example 4, the distance along the Z direction in the figure from the central portion of the first surface 31 to the light guide plate and the distance along the Z direction in the figure from the central portion of the second surface 32 to the light guide plate. Is 0.04 mm as in the sample of Example 2.

(Reference example 1)
A simulation was performed on the sample of Reference Example 1 in the same manner as the sample of Example 1 except that the light reflecting member 140A did not have any of the first portion 141, the second portion 142, and the third portion 143. .. In the sample of Reference Example 1, it is assumed that the entire translucent member is in contact with the light guide plate.

(Reference example 2)
A simulation of the sample of Reference Example 2 was performed in the same manner as the sample of Reference Example 1 except that the light emitting device was placed 0.02 mm away from the light guide plate. In the sample of Reference Example 2, the distance between the translucent member and the light guide plate is 0.02 mm, which is the same as that of the sample of Example 1.

(Reference example 3)
Similar to the sample of Reference Example 2, except that the first surface 31 and the second surface 32 are curved surfaces recessed toward the first light emitting element 121 and the second light emitting element 122 in the first cross section, respectively. A simulation was performed for the sample of Reference Example 3. The distance along the Z direction in the figure from the end to the center of the first surface 31 and the distance along the Z direction in the figure from the end to the center of the second surface 32 are the same as in the sample of Example 1. Both were assumed to be 0.02 mm. In the sample of Reference Example 3, the distance between the central portion of the translucent member and the light guide plate is 0.02 mm.

(Reference example 4)
The distance along the Z direction of the figure from the end to the center of the first surface 31 and the distance along the Z direction of the figure from the end to the center of the second surface 32 are assumed to be 0.05 mm. A simulation was performed for the sample of Reference Example 4 in the same manner as the sample of Reference Example 3 except for the above. In the sample of Reference Example 4, the distance between the central portion of the translucent member and the light guide plate is 0.05 mm.

(Reference example 5)
The distance along the Z direction of the figure from the end to the center of the first surface 31 and the distance along the Z direction of the figure from the end to the center of the second surface 32 are assumed to be 0.10 mm. A simulation was performed for the sample of Reference Example 5 in the same manner as the sample of Reference Example 4 except for the above. In the sample of Reference Example 5, the distance between the central portion of the translucent member and the light guide plate is 0.10 mm.

(Evaluation of optical coupling efficiency)
For each sample, the ratio of light rays incident on the inside of the light guide plate (components excluding Fresnel reflection) was calculated as the optical coupling efficiency, and the following results were obtained.
Example 1: 94.4%, Example 2: 92.9%, Example 3: 89.8%
Reference Example 1: 98.8%, Reference Example 2: 94.5%, Reference Example 3: 95.4%, Reference Example 4: 92.5%, Reference Example 5: 86.3%

From the calculation result of the optical coupling efficiency for the sample of Reference Example 1 and the calculation result of the optical coupling efficiency for the sample of Example 1 and the sample of Reference Example 2, the translucent member is separated from the light guide plate to be optically coupled. It can be seen that the efficiency is reduced. Further, comparing the calculation result of the optical coupling efficiency of the sample of Example 2 and the sample of Example 3 with the calculation result of the optical coupling efficiency of the sample of Reference Example 3, the center of the light guide plate and the translucent member. It can also be seen that the optical coupling efficiency decreases as the distance between the parts increases. Comparing the calculation result of the optical coupling efficiency for the sample of Example 1 and the calculation result of the optical coupling efficiency for the sample of Example 2, the distance between the light guide plate and the central portion of the translucent member is increased. Even in this case, by making the first surface 31 and the second surface 32 concave, the optical coupling efficiency is lowered due to the increase in the distance between the light guide plate and the central portion of the translucent member. The degree is expected to be mild.

26 to 32 schematically show the calculation results of the irradiance at a position 0.1 mm inside from the side surface of the light guide plate for each sample. 26 to 29 show the calculation results for the samples of Examples 1 to 4, respectively. 30, FIG. 31 and FIG. 32 show the calculation results for Reference Example 1, Reference Example 4 and Reference Example 5, respectively.

Comparing FIG. 26, which is the simulation result for the sample of Example 1, and FIG. 28, which is the simulation result for the sample of Example 3, the position of the first portion 141 between the first surface 31 and the second surface 32. It can be seen that the irradiance in is slightly reduced. It is presumed that this means that by making the first surface 31 and the second surface 32 concave, the spread of light in the plane parallel to the first cross section (in the ZX plane) is reduced. .. That is, by making the first surface 31 and the second surface 32 concave, the diffusion of light between the light emitting device and the light guide plate is suppressed, and as a result, the light reaches the light guide plate by incident on the first portion 141. It can be said that the effect of reducing the components that disappear can be obtained.

The embodiments of the present disclosure are useful for various lighting light sources, vehicle-mounted light sources, display light sources, and the like. In particular, it can be advantageously applied to a backlight unit directed to a liquid crystal display device. The light emitting device according to the embodiment of the present disclosure can be advantageously used as a backlight for a display device of a mobile device in which the demand for thickness reduction is strict.

31 First surface of the first translucent member 32 Second surface of the second translucent member 41 First curved surface of the light-reflecting member 42 Second curved surface of the light-reflecting member 43 Third curved surface of the light-reflecting member 44 Fourth curved surface of light-reflecting member 100A-100H, 100K-100N Light-emitting device 110 Substrate 121 First light-emitting element 122 Second light-emitting element 130 Translucent member 131A, 131B, 131F First translucent member 132A, 132B, 132F Second translucent member 140A, 140C to 140E Light-reflecting member 141 First part of light-reflecting member 141t First top of first part 142 Second part of light-reflecting member 142t Second top of second part 143 3rd part of light reflective member 143t 3rd top of 3rd part 160 Wiring layer 161 1st wavelength conversion member 162 2nd wavelength conversion member 163 Frequency conversion member 311 1st inclined surface of 1st translucent member 312 1st 2nd inclined surface of the translucent member 323 3rd inclined surface of the 2nd translucent member 324 4th inclined surface of the 2nd translucent member

Claims (10)

A first light emitting element and a second light emitting element, which are arranged along the first direction and have an upper surface and a side surface, respectively.
At least one translucent member having a side surface and covering the upper surface of the first light emitting element and the upper surface of the second light emitting element.
It comprises at least a part of the side surface of the first light emitting element, at least a part of the side surface of the second light emitting element, and a light reflecting member in contact with the side surface of the translucent member.
The translucent member has a first surface and a second surface exposed from the light-reflecting member, and the first surface is located above the upper surface of the first light emitting element and is the second surface. Is located above the upper surface of the second light emitting element.
The light-reflecting member has a first portion located between the first surface and the second surface in the first direction and above the first surface and the second surface.
A light emitting device in which the surface of the first portion includes at least one concave curved surface in a first cross section including the first direction and perpendicular to the upper surface of the first light emitting element. The first portion has a first top and
The at least one concave curved surface includes a first curved surface and a second curved surface.
The first curved surface is located between the first top portion of the first portion and the first surface of the translucent member in the first cross section.
The light emitting device according to claim 1, wherein the second curved surface is located between the first top portion of the first portion and the second surface of the translucent member in the first cross section. The light emitting device according to claim 2, wherein each of the first surface and the second surface is concave in the first cross section. The light-reflecting member further includes a first surface of the translucent member and a second portion and a third portion located above the second surface.
The second portion is located on the opposite side of the first portion with respect to the position of the first surface in the first direction.
The light emitting device according to claim 3, wherein the third portion is located on the opposite side of the first portion with respect to the position of the second surface in the first direction. The first surface is
In the first cross section, a first inclined surface approaching the upper surface of the first light emitting element from one end toward the center,
In the first cross section, the second inclined surface approaching the upper surface of the first light emitting element from the other end toward the center is included.
The second surface is
A third inclined surface approaching the upper surface of the second light emitting element from one end to the center in the first cross section.
The light emitting device according to claim 3 or 4, further comprising a fourth inclined surface approaching the upper surface of the second light emitting element from the other end to the center in the first cross section. The second portion and the third portion of the light-reflecting member have a second apex and a third apex, respectively.
The surface of the second portion has a concave third curved surface between the second top and the first surface of the translucent member in the first cross section.
The surface of the third portion has a concave fourth curved surface in the first cross section between the third top and the second surface of the translucent member.
The first curved surface of the first portion of the light-reflecting member, the first surface of the translucent member, and the third curved surface of the second portion of the light-reflecting member are 1 in the first cross section. Consists of two curved surfaces
The second curved surface of the first portion of the light-reflecting member, the second surface of the translucent member, and the fourth curved surface of the third portion of the light-reflecting member are 1 in the first cross section. The light emitting device according to claim 4, which constitutes two curved surfaces. The shape of the first surface in the second cross section perpendicular to the first direction is flat, and the shape of the second surface in the second cross section is flat, according to any one of claims 1 to 6. Light emitting device. The at least one translucent member is
The first translucent member located above the upper surface of the first light emitting element,
The second translucent member located above the upper surface of the second light emitting element is included.
The light emitting device according to any one of claims 1 to 7, wherein the first translucent member and the second translucent member have the first surface and the second surface, respectively. A first wavelength conversion member located between the first translucent member and the first light emitting element,
The light emitting device according to claim 8, further comprising a second wavelength conversion member located between the second translucent member and the second light emitting element. A substrate that supports the first light emitting element and the second light emitting element is further provided.
The light emitting device according to any one of claims 1 to 9, wherein the light reflecting member covers at least a part of the upper surface of the substrate.

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