Light emitting device having external connection with different width
A light emitting device includes a substrate, a light emitting element, a light transmissive member and a sealing member. The substrate includes an insulating base material, connection terminals, and external connection sections. The insulating base material has a first main surface, a second main surface, and a mounting surface. The connection terminals are disposed on the first main surface. The external connection sections are disposed on the second main surface. Each of the external connection sections has a narrow-width region and a wide-width region. The light emitting element has a pair of electrodes connected to element connection sections of the pair of connection terminals. The light transmissive member is disposed on an upper surface of the light emitting element. The sealing member covers at least a part of a side surface of the light emitting element and at least a part of the light transmissive member.
1. A light emitting device comprising:
a substrate including
an insulating base material having a first main surface, a second main surface that is opposite from the first main surface, and a mounting surface that is adjacent to at least the second main surface,
a pair of connection terminals disposed on the first main surface, and
a pair of external connection sections disposed on the second main surface, each of the external connection sections having a narrow-width region and a wide-width region with a width of the wide-width region being wider than a width of the narrow-width region;
a light emitting element having a pair of electrodes connected to element connection sections of the pair of connection terminals;
a light transmissive member disposed on an upper surface of the light emitting element; and
a sealing member covering at least a part of a side surface of the light emitting element and at least a part of the light transmissive member.
2. The light emitting device according to claim 1 , wherein
the substrate further includes a pair of vias made of metal.
3. The light emitting device according to claim 1 , wherein
the substrate further includes a pair of vias arranged in the vicinity of a center of the second main surface.
4. The light emitting device according to claim 1 , wherein
the insulating base material defines a concave component opening on the second main surface and the mounting surface.
5. The light emitting device according to claim 4 , wherein
the substrate further includes a pair of vias arranged in line symmetry with respect to the line passing through the center of the concave component when viewed along the direction normal to the second main surface.
6. The light emitting device according to claim 4 , wherein
the substrate further includes a pair of vias arranged farther away from the mounting surface than an innermost edge of the concave component on the second main surface when viewed along a direction normal to the second main surface.
7. The light emitting device according to claim 4 , wherein
the concave component has a curved surface in a cross-sectional view.
8. The light emitting device according to claim 1 , wherein
the substrate further includes a pair of vias each having a circular shape on the second main surface.
9. The light emitting device according to claim 1 , wherein
each of the element connection sections has a protruding shape.
10. The light emitting device according to claim 1 , wherein
a plane shape of each of the element connection sections is a quadrangle shape or an approximately quadrangle shape in plan view.
11. The light emitting device according to claim 1 , wherein
plane shapes of each of the element connection sections and each of the electrodes are substantially the same.
12. The light emitting device according to claim 1 , wherein
the substrate has a shape with a lengthwise direction and a widthwise direction.
13. The light emitting device according to claim 1 , wherein
the substrate has a shape with a lengthwise direction and a widthwise direction, and each of the element connection sections is spaced apart from an end surface of the substrate extending along the lengthwise direction.
14. The light emitting device according to claim 1 , wherein
the external connection sections have shapes that are symmetrical in a lengthwise direction of the substrate.
15. The light emitting device according to claim 1 , further comprising
the sealing member covers at least a part of a side surface of the light transmissive member.
16. The light emitting device according to claim 1 , wherein
the sealing member has a surface extending substantially on the same plane as the substrate on the mounting surface.
17. The light emitting device according to claim 1 , wherein
the light transmissive member contains a phosphor.
18. The light emitting device according to claim 17 , wherein
the phosphor is a KSF-based phosphor.