JP2022031370A - Light-emitting device and light-emitting module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve downsizing and reduce the unevenness of illuminance.

SOLUTION: Provided is a light-emitting device comprising a substrate on which a wiring part is formed and a plurality of light-emitting elements arranged on the wiring part. The plurality of elements include a first element group, a second element group, a third element group and a fourth element group that are arrayed in a first direction, the first to fourth element groups being sequentially arrayed in a second direction different from the first direction. In the second direction, the first and second element groups are such that a first region between the elements of the first element group overlaps a second region between the elements of the second element group, and the third and fourth element groups are such that a third region overlaps a fourth region. The distance between the first element group and an outer edge of the substrate located on the side of the first element group that is opposite a first connection part is made to be smaller than the interval between the first and second element groups, and the distance between the fourth element group and the outer edge of the substrate is made to be smaller than the interval between the third and fourth element groups, thereby ensuring that the same current is fed to each light-emitting element.

SELECTED DRAWING: Figure 1A

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a light emitting device and a light emitting module.

Light emitting devices that use a light emitting element as a light source are used in various fields. Such a light emitting device includes a light source unit and a reflecting mirror provided so as to focus on the light source unit, and is detachably configured so that the light source unit can be unitized and its position can be adjusted with respect to the reflecting mirror. (Patent Document 1).
In the light source unit, a light emitting device in which a plurality of light emitting elements are arranged on a wiring board has been proposed (Patent Documents 2 and 3). Further, in order to arrange the light emitting elements in the longitudinal direction of the rectangular substrate and prevent the decrease in illuminance at both ends thereof, an arrangement in which the number of light emitting elements at both ends is increased has been proposed (
Patent Document 4).

Japanese Unexamined Patent Publication No. 2016-164871 Japanese Unexamined Patent Publication No. 2005-93097 WO2014 / 21030 JP 2016-157889

As a light source, a light source having a smaller size and a more uniform illuminance is required.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a light emitting device and a light emitting module capable of reducing the size and reducing the unevenness of illuminance.

The present application includes the following inventions.

According to the light emitting device and the light emitting module in the embodiment of the present invention, the size can be further reduced.
It is possible to further reduce the unevenness of the illuminance.

It is a schematic perspective view of the light emitting device of the embodiment of this invention. It is a top view of the light emitting device of FIG. 1A. However, the wire is omitted. It is a top view of the light emitting device of another embodiment of this invention. However, the wire is omitted. It is a top view of the substrate in the light emitting device of FIG. 1A. It is a top view which shows the light emitting module of embodiment of this invention. It is an exploded perspective view of the light source used in the light emitting module of the embodiment of this invention. It is an illuminance distribution diagram by simulation when the light source of FIG. 4 is used. As a comparative example, it is a top view which shows the light emitting module which arranged the light emitting elements at equal intervals. FIG. 5 is an illuminance distribution diagram by simulation when a light source using the light emitting module of FIG. 5B is used.

Hereinafter, embodiments of the light emitting device and the light emitting module according to the present invention will be described. Since the drawings referred to in the following description schematically show the present embodiment, the scale, spacing, positional relationship, etc. of each member are exaggerated or a part of the members is not shown. There is. Further, in the following description, members having the same or the same quality are shown in principle for the same name and reference numeral, and detailed description thereof will be omitted as appropriate.

Embodiment 1: Light emitting device As shown in FIGS. 1A and 1B, the light emitting device 10 of this embodiment has a wiring portion 2 on one surface thereof.
3 is formed on the substrate 1, and a plurality of light emitting elements 11a, 12a arranged on the wiring portions 2, 3 are formed.
, 13a, 14a ...
By arranging a plurality of light emitting elements in this way, it is possible to obtain a light emitting device having a desired illuminance with a desired length and size.

(Board 1)
The substrate 1 is for mounting a light emitting element, and is composed of a plate-shaped member having a flat surface. The substrate 1 may have an insulating property, a conductive structure, or a single-layer structure or a laminated structure obtained by combining these. The shape of the substrate 1 can be appropriately set, but for example, a quadrangle is preferable, and a rectangle is more preferable. For example, the size of the substrate 1 is several mm to several tens of centimeters × several mm to several tens of centimeters.
In FIG. 1A, the substrate 1 is, for example, a rectangle of 9 × 18 mm.

(Wiring part 2, 3)
As shown in FIG. 2, wiring portions 2 and 3 are arranged on one surface of the substrate 1. Wiring part 2,
3 is arranged in a predetermined shape by a conductive material. At least a pair of wiring portions 2 and 3 are arranged corresponding to positive and negative. The shapes of the wiring parts 2 and 3 can be set as appropriate,
Each is partially formed on the substrate 1. Any of these pairs of wiring, for example
The wiring portion 2 corresponding to positive or negative has a first connection portion 2a and a second connection portion 2b. It is preferable that the first connecting portion 2a and the second connecting portion 2b extend parallel to each other and parallel to a pair of sides of the substrate 1. The first connection portion 2a and the second connection portion 2b are connected at one end side of the substrate 1. However, the first connecting portion 2a and the second connecting portion 2b may have a portion extending in parallel as a whole, and one side thereof may not be a straight line or may be curved. It may have irregularities. The width and length of the first connection portion 2a and the second connection portion 2b can be appropriately set, for example, about 3 to 20% of the width of the substrate 1 and 20 to 90% of the length of the substrate.
The degree can be mentioned. The width and length of the portion where the first connecting portion 2a and the second connecting portion 2b are connected are
For example, about 80 to 100% of the width of the substrate 1 and about 10 to 80% of the length of the substrate can be mentioned.

The wiring portion 3 is arranged outside the first connection portion 2a, outside the second connection portion 2b, and between the first connection portion 2a and the second connection portion 2b. These are arranged parallel to each other with respect to the first connecting portion 2a and the second connecting portion 2b as a whole, and extend substantially parallel to the pair of sides of the substrate 1. Further, these are connected at the other end side of the substrate 1. However, the wiring unit 3 is
It suffices to have a portion extending in parallel as a whole, and one side thereof may not be a straight line, may be curved, or may have irregularities. 1st connection part 2a and 2nd connection part 2b
The width and length of the portion extending along the above may be, for example, about 3 to 20% of the width of the substrate 1 and about 20 to 90% of the length of the substrate. The width and length of the portion to which these extending portions are connected is, for example, about 80 to 100% of the width of the substrate 1, and is 10 of the length of the substrate.
About 80% can be mentioned.

Specifically, as shown in FIGS. 1A and 1B, the first connection portion 2a is arranged between the first light emitting element group and the second light emitting element group described later, and the width W1 thereof is 0.7 mm. be. 2nd connection part 2b
Is arranged between the third light emitting element group and the fourth light emitting element group, which will be described later, and the width W2 thereof is
It is 0.7 mm. The width of the first connecting portion 2a and the width of the second connecting portion 2b may be different, but are preferably the same. As a result, as will be described later, the width of the connection portion where the wires are arranged can be kept to a minimum, and the light emitting device can be miniaturized.
Further, among the portions extending along the first connection portion 2a and the second connection portion 2b of the wiring portion 3, the width of the portion where the first light emitting element group and the fourth light emitting element group described later are arranged will be described later. It suffices as long as it can mount a light emitting element, and is, for example, 1.4 mm. The portion arranged between the first connecting portion 2a and the second connecting portion 2b is preferably at least twice the width W1 and / or W2.
It is 3 mm.

The wiring portions 2 and 3 are preferably formed in a large area with respect to one surface of the substrate 1. Thereby, heat dissipation and reflectivity can be improved. For example, the distances W11 and W12 between the end of the wiring portions 2 and 3 facing one side of the board 1 and one side of the substrate 1 are the widths W1 and / or the second connection portion 2b of the first connection portion 2a. It is preferably smaller than the width W2.
In FIG. 1B, W11 is 0.5 mm and W12 is 0.5 mm.

The wiring portions 2 and 3 may have through holes 3c or the like that expose the surface of the substrate 1 in a part thereof. Such through holes 3c and the like can be used for markings such as positioning.
The surface of the wiring layer 2 other than the first connection portion 2a and the second connection portion 2b may be covered with a coating layer. Further, the surface of the wiring portion 3 other than the region on which the light emitting element is placed may be covered with a coating layer. The coating layer can be formed of, for example, a resin or the like.

(Light emitting element)
A plurality of light emitting elements 11a, 12a, 13a, 14a ... Are arranged in a row on the wiring portion 2. The number of columns can be appropriately set, and may be two or more columns, preferably three columns or four columns.

For example, as shown in FIGS. 1A and 1B, the first light emitting element group 1 arranged in the first direction, respectively.
1. It has a second light emitting element group 12, a third light emitting element group 13, and a fourth light emitting element group 14. The first light emitting element group 11, the second light emitting element group 12, the third light emitting element group 13, and the fourth light emitting element group 14 are arranged in order in a second direction different from the first direction. Here, the second direction is the first.
The direction may be any direction that intersects the direction, and is preferably an orthogonal direction. Here, the first
The direction and the second direction are referred to as, for example, the Y direction and the X direction, respectively.

1st light emitting element group 11, 2nd light emitting element group 12, 3rd light emitting element group 13 and 4th light emitting element group 1
The number of light emitting elements belonging to 4 may be 2 or more, and may be the same number or different numbers in each group. Among them, the number of light emitting elements in the first light emitting element group is preferably larger than the number of light emitting elements in the second light emitting element group and / or the third light emitting element group, and the number of light emitting elements in the fourth light emitting element group is preferable. However, it is preferable that the number of light emitting elements is larger than the number of light emitting elements of the third light emitting element group and / or the second light emitting element group, and the number of light emitting elements of the first light emitting element group is the number of the second light emitting element group and / or the third.
It is more preferable that the number of light emitting elements is larger than the number of light emitting elements of the light emitting element group and the number of light emitting elements of the fourth light emitting element group is larger than the number of light emitting elements of the third light emitting element group and / or the second light emitting element group. .. again,
The first light emitting element group 11 and the fourth light emitting element group 14 are preferably the same number, the second light emitting element group 12 and the third light emitting element group 13 are preferably the same number, and the first light emitting element group 11 And the fourth light emitting element group 14 are the same number, and the second light emitting element group 12 and the third light emitting element group 13
Is more preferably the same number. The light emitting elements arranged in each row can be appropriately set, and may be, for example, 2 or more, preferably 3 or 4. For example, the light emitting elements arranged in the first light emitting element group 11 and the fourth light emitting element group 14 are 4 to
8 is mentioned, and 4 to 6 are preferable. Examples of the light emitting elements arranged in the second light emitting element group 12 and the third light emitting element group 13 are 3 to 7, and 3 to 5 are preferable.

In one embodiment, as shown in FIGS. 1A and 1B, the first light emitting element group 11 and the fourth light emitting element group 14 have five light emitting elements, and the second light emitting element group 12 and the third light emitting element group 13 have. Has four light emitting elements. Here, each light emitting element is, for example, 1.4 × 1.4 mm.

The first light emitting element group 11 is arranged at a predetermined interval from the adjacent second light emitting element group 12. Similarly, the second light emitting element group 12 and the adjacent third light emitting element group 13 are arranged at a predetermined interval, and the third light emitting element group 13 and the adjacent fourth light emitting element group 14 are predetermined. They are arranged at intervals. These intervals may vary throughout the column, but are preferably the same.

For example, as shown in FIG. 1B, the distance D23 between the second light emitting element group 12 and the adjacent third light emitting element group 13 in the X direction is the distance D23 between the first light emitting element group 11 and the adjacent second light emitting element group 12. It is preferable that the interval is narrower than D12. The interval D23 is preferably narrower than the interval D34 between the third light emitting element group 13 and the adjacent fourth light emitting element group 14. The interval D12 and the interval D34 may be different, but preferably the same. The spacing D12 and spacing D34 are preferably wider than the spacing between adjacent light emitting elements in the row. The spacing D23 may be wider, narrower, or the same as the spacing between adjacent light emitting elements in the row, but is preferably the same.

For example, in FIG. 1B, D12 is 1.1 mm, D23 is 0.2 mm, and so on.
D34 is 1.1 mm. The distance W between adjacent light emitting elements in each light emitting element group is 0.2 m.
m.

The distance D1 between the first light emitting element group 11 and the outer edge of the substrate located on the opposite side of the first connecting portion with respect to the first light emitting element group may be the same as, for example, any of the interval D12, the interval D23, and the interval D34. It may be different for any of them, and it can be set as appropriate. For example, the distance D1 is preferably smaller than the interval D12, and more preferably half or less than the interval D12. Similarly, the distance D4 between the fourth light emitting element group 14 and the outer edge of the substrate located on the opposite side of the second connection portion with respect to the fourth light emitting element group may be the same as any of the intervals D34, for example. It may be different for any of them, and can be set as appropriate. For example, the distance D4 is preferably smaller than the interval D34, and more preferably half or less than the interval D34.
The distance D1 and the distance D4 may be different, but are preferably the same.
By setting such an interval, it is possible to prevent uneven illuminance when a light emitting module in which a plurality of substrates described later are arranged is configured, and it is possible to obtain more uniform illuminance in the entire light emitting module.
In FIG. 1B, the distance D1 is 0.5 mm and the distance D4 is 0.5 mm.

The intervals of the light emitting elements constituting the first light emitting element group 11 may be different from each other, but are preferably equal. The region between the light emitting elements is referred to as, for example, the first region R1.
The intervals of the light emitting elements constituting the second light emitting element group 12 may be different from each other, but are preferably equal. The region between the light emitting elements is referred to as, for example, the second region R2.
The intervals of the light emitting elements constituting the third light emitting element group 13 may be different from each other, but are preferably equal. The region between the light emitting elements is referred to as, for example, the third region R3.
The intervals of the light emitting elements constituting the fourth light emitting element group 14 may be different from each other, but are preferably equal. The region between the light emitting elements is referred to as, for example, the fourth region R4.

The first region R1 may have a different size from the fourth region R4, but is preferably the same size.
The second region R2 may have a different size from the third region R3, but is preferably the same size.
When viewed from the side of the substrate, it is preferable that the first region R1 and the second region R2 are arranged so as to be offset from each other as shown in FIG. 1B. In this case, the second region R2 preferably overlaps the light emitting element 11a constituting the first light emitting element group 11, and may overlap the central portion of the light emitting element 11a constituting the first light emitting element group 11. More preferred. Similarly, it is preferable that the third region R3 and the fourth region R4 are arranged so as to be offset from each other. In this case, the third
The region R3 preferably overlaps the light emitting element 14a constituting the fourth light emitting element group 14, and more preferably overlaps with the central portion of the light emitting element 14a constituting the fourth light emitting element group 14.
Further, as shown in the light emitting device 10X shown in FIG. 1C, the first region R1 and the second region R2 may overlap when viewed from the side of the substrate. In this case, for example, in each light emitting element group, it means that the endmost light emitting element among the light emitting elements arranged in the Y direction is arranged so as to draw a straight line at one end. Similarly, the third region R3 and the fourth region R4 may overlap. In this case, for example, in each light emitting element group, it means that the endmost light emitting element among the light emitting elements arranged in the Y direction is arranged so as to draw a straight line at one end.

The light emitting elements 11a, 12a, 13a, 14a ... Are electrically connected to the wiring portions 2 and 3. The electrical connection with the wiring unit may be a series connection, a parallel connection, or a combination thereof, but a parallel connection is preferable. As a result, the same current can be supplied to each light emitting element, and the illuminance can be made uniform.
The light emitting element may be connected via a bonding material such as solder by flip-chip mounting across the wiring portion, but as shown in FIG. 1A, it is electrically connected to the connecting portion by a wire. Is preferable. The position of wire bonding in this case can be appropriately set.

For example, as shown in FIG. 1A, for example, the first connection portion 2a arranged between the first light emitting element group 11 and the second light emitting element group 12 is the light emitting element 11a of the first light emitting element group 11.・ And the second
It is connected to the light emitting elements 12a ... Of the light emitting element group 12 by wires. That is, on the first connection portion 2a, the connection points of the wires connected to the light emitting element 11a ... And the light emitting element 12a ... Are arranged.
The second connection portion 2b arranged between the third light emitting element group 13 and the fourth light emitting element group 14 is a third.
The light emitting element 13a of the light emitting element group 13 and the light emitting element 14a of the fourth light emitting element group 14 ...
Is connected by a wire. That is, the light emitting element 13a ...
-And the connection point of the wire connected to the light emitting element 14a ... Is arranged.
By connecting the light emitting elements with wires in this way, it is not necessary to provide a space for wire bonding between adjacent light emitting elements of the light emitting element group in the Y direction.
As a whole, the distance between the wiring portions 2 and 3 can be narrowed. Further, the wire connected to the light emitting element 11a of the first light emitting element group 11 and the wire connected to the light emitting element 12a of the second light emitting element group 12 are integrated in the first connection portion 2a to emit light from the third light emitting element group 13. By consolidating the wire connected to the element 13a and the wire connected to the light emitting element 14a of the fourth light emitting element group 14 into the second connecting portion 2b, the light emitting element 11a constituting the first light emitting element group 11 and the substrate face each other. Between the sides, between the light emitting elements 14a constituting the fourth light emitting element group 14 and the opposite sides of the substrate, and between the light emitting elements 12a constituting the second light emitting element group 12 and the third light emitting element group 13. Since it is not necessary to provide a space for wire bonding between the light emitting element 13a and the light emitting element 13a, the wirings 2 and 3
Can be narrowed. As a result, the width of the substrate can be reduced, and the light emitting device can be miniaturized.

As the light emitting device, any semiconductor light emitting device known in the art can be used. Specifically, for example, a nitride semiconductor (In _X ) such as a group III-V compound semiconductor and a group II-VI compound semiconductor.
Al _Y Ga _1-XY N, 0 ≦ X, 0 ≦ Y, X + Y ≦ 1), specifically, In _X Al _Y Ga _1-XY
Examples thereof include light emitting devices made of various semiconductors such as nitride semiconductors such as N (0 ≦ X, 0 ≦ Y, X + Y ≦ 1). The emission wavelength of such a light emitting element can be appropriately set depending on the application and the like. Among them, those irradiated with ultraviolet rays are preferable.
The light emitting element may have both positive and negative electrodes arranged on one surface, but it is preferable that both positive and negative electrodes are arranged on different surfaces. As a result, one side is fixed by a joining member such as solder by placing the light emitting element on the wiring part, and electrical connection is achieved, and the other side is connected to the connection part by wire bond as described above. Can make electrical connections.

Embodiment 2: Light emitting module In the light emitting module 20 of this embodiment, as shown in FIG. 3, a plurality of the above-mentioned light emitting devices 10 are arranged in a second direction (X direction). In this case, the sides of the plurality of substrates extending in the X direction are preferably arranged in a substantially linear shape, but may be arranged in a substantially stepped shape or the like depending on the reflective member or the like used.
In FIG. 3, for example, nine are arranged.
By arranging the plurality of light emitting devices 10 in a row in this way, the light emitting module 20 having a desired length and size can be obtained, and the luminous intensity, brightness, and the like can be appropriately adjusted.
In the light emitting module 20, adjacent substrates 1 may be in contact with each other or may be separated from each other. Above all, it is preferable that the distance is slightly separated, and it is more preferable that the distance between the substrates 1 is about several mm.

In such a light emitting module, an adjacent light emitting device (in FIG. 3, for example, 10A)
And 10B) are the first light emitting element group 11 of the light emitting device 10B and the light emitting device 1 in the X direction.
The distance between the first light emitting element group and the outer edge of the substrate 1 (D1 in FIG. 1B) and the distance between the fourth light emitting element group and the outer edge of the substrate 1 (in FIG. 1B) between the fourth light emitting element group 14 of 0A. Each of D4) has a distance between the first light emitting element group 11 and the adjacent second light emitting element group 12 (D12 in FIG. 1B), and a distance between the third light emitting element group 13 and the adjacent fourth light emitting element group 14 (D4). It is preferably narrower than any of D34) in FIG. 1B.

Further, the adjacent light emitting devices (for example, 10B and 10C in FIG. 3) are placed between the fourth light emitting element group 14 of the light emitting device 10B and the first light emitting element group 11 of the light emitting device 10C in the X direction. The distance between the first light emitting element group and the outer edge of the substrate 1 (D1 in FIG. 1B) and the distance between the fourth light emitting element group and the outer edge of the substrate 1 (D4 in FIG. 1B) are each of the first light emitting element group 11.
And the distance between the second light emitting element group 12 and the adjacent second light emitting element group 12 (D12 in FIG. 1B), the third light emitting element group 13
It is preferable that the distance between the device and the adjacent fourth light emitting device group 14 (D34 in FIG. 1B) is narrower than any of them.

By setting such a width, it is possible to reduce illuminance unevenness between adjacent light emitting devices, and it is possible to obtain uniform illuminance in the entire light emitting module.

Such a light emitting module 20 can be used as a light source 30 as shown in FIG. 4, for example. In this light source 30, a light emitting module 20 in which nine light emitting devices 10 are arranged in a row in the X direction is arranged on the back side of the installation table 32, and the installation table 32 is arranged from above the light emitting module toward the front. The reflecting portion 31 to be covered is arranged and configured on the installation table 32.
The reflective portion 31 is fixed to the installation table 32, for example, by a screw.
The reflective portion 31 has a cross-sectional shape orthogonal to the X direction, such as a parabolic shape.
The installation table 32 is preferably made of a material having high thermal conductivity such as metal (for example, copper, aluminum), ceramics such as aluminum nitride, and carbon. As a result, the installation table 32 can efficiently dissipate the heat generated by the light emitting module 20.

FIG. 5A shows an illuminance distribution diagram by simulation using the light source 30 shown in FIG. 4 described above. The illuminance (W / mm ² ) represents the illuminance on the irradiation surface located at a distance of 100 mm from the light source 30.
For comparison, the light emitting elements were arranged at equal intervals in the X direction as shown in FIG. 5B.
Furthermore, light sources arranged at equal intervals in the direction perpendicular to the X direction (total number of light emitting elements: 32 x 4).
Prepared. Using this light source, a simulation was performed in the same manner as above. The illuminance distribution map is shown in FIG. 5C.
From these results, it can be seen that in the light source 30 using the light emitting module, the illuminance unevenness in the Y direction can be reduced.

The light emitting device and the light emitting module of the embodiment according to the present invention can be used for an irradiation device of various wavelengths (for example, an ultraviolet irradiation device), a lighting device, an in-vehicle light emitting device, and the like.

1 board 2 wiring part 2a first connection part 2b second connection part 3 wiring part 3c through hole 10 light emitting device 10A, 10B, 10C, 10X light emitting device 11 first light emitting element group 11a, 12a, 13a, 14a light emitting element 12th 2 Light emitting element group 13 3rd light emitting element group 14 4th light emitting element group 20 Light emitting module 30 Light source 31 Reflecting unit 32 Installation stand D1 Distance D4 Distance R1 1st area R2 2nd area R3 3rd area R4 4th area W Interval W11 Distance W12 distance

Claims (5)

The board on which the wiring part is formed and
A plurality of light emitting elements arranged on the wiring portion are provided.
The plurality of light emitting elements include a first light emitting element group, a second light emitting element group, a third light emitting element group, and a fourth light emitting element group arranged in the first direction, respectively.
The first light emitting element group, the second light emitting element group, the third light emitting element group, and the fourth light emitting element group are arranged in order in a second direction different from the first direction.
The wiring portion has a first connection portion and a second connection portion.
The first connection portion is arranged between the first light emitting element group and the second light emitting element group, and is connected to the light emitting element of the first light emitting element group and the light emitting element of the second light emitting element group by a wire. And
The second connection portion is arranged between the third light emitting element group and the fourth light emitting element group, and is connected to the light emitting element of the third light emitting element group and the light emitting element of the fourth light emitting element group by a wire. Has been
In the second direction, the distance between the second light emitting element group and the third light emitting element group is narrower than the width of the first connecting portion and the width of the second connecting portion.
In the second direction, the first region, which is the distance between the light emitting elements in the first light emitting element group, is the light emitting element in the second light emitting element group. It overlaps with the second area, which is the interval between them,
In the second direction, the third region, which is the distance between the light emitting elements in the third light emitting element group and the fourth light emitting element group, is the light emitting element in the fourth light emitting element group. It overlaps with the 4th area, which is the interval between them,
The distance between the first light emitting element group and the outer edge of the substrate located on the side opposite to the first connecting portion with respect to the first light emitting element group is set to the distance between the first light emitting element group and the second light emitting element group. Make it smaller than the distance between
The distance between the 4th light emitting element group and the outer edge of the substrate located on the opposite side of the 2nd connection portion with respect to the 4th light emitting element group is set to the distance between the 3rd light emitting element group and the 4th light emitting element group. Make it smaller than the distance between
A light emitting device in which the same current is supplied to each light emitting element. The light emitting device according to claim 1, wherein the width of the first connection portion is the same as the width of the second connection portion. The light emitting device according to claim 1 or 2, wherein the number of each light emitting element of the first light emitting element group, the second light emitting element group, the third light emitting element group, and the fourth light emitting element group is the same. The first light emitting device and the second light emitting device, which are the light emitting devices according to any one of claims 1 to 3, are arranged in the second direction.
Between the first light emitting element group of the second light emitting device and the fourth light emitting element group of the first light emitting device, the first light emitting element group of the second light emitting device and the outer edge of the substrate. The distance and the distance between the fourth light emitting element group of the first light emitting device and the outer edge of the substrate are the distances between the first light emitting element group of the second light emitting device and the adjacent second light emitting element group. , A light emitting module smaller than any of the distances between the third light emitting element group of the first light emitting device and the adjacent fourth light emitting element group. The first light emitting device and the second light emitting device, which are the light emitting devices according to any one of claims 1 to 3, are arranged in the second direction.
Between the first light emitting element group of the second light emitting device and the fourth light emitting element group of the first light emitting device, the first light emitting element group of the second light emitting device and the second light emitting device. The distance between the outer edge of the substrate and the distance between the fourth light emitting element group of the first light emitting device and the outer edge of the substrate of the first light emitting device is each of the first of the second light emitting device. A light emitting module smaller than any of the distance between the light emitting element group and the second light emitting element group and the distance between the third light emitting element group and the fourth light emitting element group of the first light emitting device.

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