Light emitting device
A base includes: a bottom part having a bottom face; and a lateral part surrounding the bottom face and extending upwards from the bottom face, the lateral part having an uppermost face and comprises a first stepped portion including a first upper face and a second stepped portion including a second upper face, the first upper face and the second upper face being disposed below the uppermost face, and a height of the first stepped portion from the bottom face being different from a height of the second stepped portion from the bottom face. In a top view: the first upper face and the second upper face are disposed inward of the uppermost face, the bottom face is directly adjacent to the first upper face, the bottom face is directly adjacent to the second upper face, and the first upper face is directly adjacent to the second upper face.
1. Abase comprising:
a bottom part having a bottom face; and
a lateral part surrounding the bottom face and extending upwards from the bottom face, wherein the lateral part has an uppermost face and comprises a first stepped portion including a first upper face and a second stepped portion including a second upper face, wherein the first upper face and the second upper face are disposed below the uppermost face, and wherein a height of the first stepped portion from the bottom face is different from a height of the second stepped portion from the bottom face, wherein:
in a top view:
the first upper face and the second upper face are disposed inward of the uppermost face,
the bottom face is directly adjacent to the first upper face,
the bottom face is directly adjacent to the second upper face, and
the first upper face is directly adjacent to the second upper face.
2. The base according to claim 1 , wherein:
in the top view, the uppermost face is directly adjacent to the first upper face and the second upper face.
3. The base according to claim 1 , wherein:
in the top view, a length of the first stepped portion is longer than a length of the second stepped portion.
4. The base according to claim 3 , wherein:
the height of the first stepped portion from the bottom face is less than the height of the second stepped portion from the bottom face.
5. The base according to claim 1 , wherein:
the bottom face is planer.
6. The base according to claim 1 , wherein:
the uppermost face is planer.
7. The base according to claim 1 , wherein:
in the top view, a periphery of the base is rectangular.
8. The base according to claim 1 , further comprising:
a first wiring region located on the first upper face of the first stepped portion.
9. The base according to claim 8 , further comprising:
a second wiring region located on the second upper face of the second stepped portion.
10. Alight emitting device comprising:
a base having a bottom face and a lateral part surrounding the bottom face and extending upwards from the bottom face, wherein the lateral part has an uppermost face and comprises a first stepped portion including a first upper face and a second stepped portion including a second upper face, wherein the first upper face and the second upper face are disposed below the uppermost face, and wherein a height of the first stepped portion from the bottom face is different from a height of the second stepped portion from the bottom face; and
a semiconductor laser element disposed on the bottom face, wherein:
in a top view:
the first upper face and the second upper face are disposed inward of the uppermost face,
the bottom face is directly adjacent to the first upper face,
the bottom face is directly adjacent to the second upper face, and
the first upper face is directly adjacent to the second upper face.
11. The light emitting device according to claim 10 , wherein:
in the top view, the uppermost face connects the first upper face and the second upper face.
12. The light emitting device according to claim 10 , wherein:
in the top view, a length of the first stepped portion is longer than a length of the second stepped portion.
13. The light emitting device according to claim 12 , wherein:
the height of the first stepped portion from the bottom face is lower than the height of the second stepped portion from the bottom face.
14. The light emitting device according to claim 10 , wherein:
the base comprises a first wiring region located on the first upper face of the first stepped portion, and
the semiconductor laser element is electrically connected to the first wiring region.
15. The light emitting device according to claim 14 , wherein:
the base comprises a second wiring region located on the second upper face of the second stepped portion.
16. The light emitting device according to claim 15 , wherein:
the semiconductor laser element is not electrically connected to the second wiring region.
17. The light emitting device according to claim 10 , further comprising:
a cover member bonded to the uppermost face of the base.
18. The light emitting device according to claim 17 , further comprising:
wherein the uppermost face is planar.
19. The light emitting device according to claim 10 , wherein:
the bottom face is planar.
20. The light emitting device according to claim 10 , wherein:
in the top view, a periphery of the base is rectangular.