Light emitting device and method for manufacturing light emitting device
A light emitting device includes a package defining a recess, a cap and at least one laser element. The cap is fixed to the package so as to cover the recess. The cap includes a light-transmissive member having a lower surface facing the package and an upper surface, the lower surface having a light extraction region, and a light blocking film arranged on the lower surface so as to avoid the light extraction region, the light blocking film including a mark representing prescribed information. The at least one laser element is disposed in a space bounded by the cap and the package at a prescribed position such that the light extraction region is irradiated by laser light emitted from the at least one laser element. At least a part of the at least one laser element overlaps at least a part of the light blocking film in a top view.
1. A light emitting device comprising:
a package defining a recess;
a cap fixed to the package so as to cover the recess, and the cap including
a light-transmissive member having a lower surface facing the package and an upper surface opposite to the lower surface, the lower surface having a light extraction region, and
a light blocking film arranged on the lower surface of the light-transmissive member so as to avoid the light extraction region, the light blocking film including a mark representing prescribed information; and
at least one laser element disposed in a space bounded by the cap and the package at a prescribed position such that the light extraction region is irradiated by laser light emitted from the at least one laser element, at least a part of the at least one laser element overlapping at least a part of the light blocking film in a top view.
2. The light emitting device according to claim 1 , further comprising
a light reflector reflecting the laser light from the at least one laser element toward the light-transmissive member,
wherein the light blocking film has a shape that surrounds the light reflector in the top view.
3. The light emitting device according to claim 1 , wherein
the at least one laser element has a light emitting end surface and a light reflecting end surface, and
the light blocking film is provided at a position where the laser light emitted from the light reflection end surface of the at least one laser element reaches directly or after being reflected by an inner wall of the recess.
4. The light emitting device according to claim 1 , wherein
the at least one laser element includes a plurality of laser elements configured to emit laser lights having different luminosity functions.
5. The light emitting device according to claim 4 , wherein
the mark is disposed closest to one of the laser elements configured to emit laser light having the lowest luminosity function among the laser elements, in the top view.
6. The light emitting device according to claim 4 , wherein
the laser elements include a blue laser element configured to emit blue laser light, a green laser element configured to emit green laser light, and a red laser element configured to emit red laser light.
7. The light emitting device according to claim 6 , wherein
the mark is arranged at a position that does not overlap any of the blue laser element, the green laser element and the red laser element in the top view.
8. The light emitting device according to claim 1 , wherein
the mark is composed of a combination of a portion where the light blocking film is present and a portion where the light blocking film is absent.
9. The light emitting device according to claim 1 , wherein
the light blocking film extends to an outer edge of the light-transmissive member or to the vicinity of the outer edge of the light-transmissive member.
10. The light emitting device according to claim 9 , further comprising
a joining member joining a part of the light blocking film and a part of the package.
11. The light emitting device according to claim 1 , wherein
the mark is a machine-readable code.
12. A method for manufacturing a light emitting device comprising:
preparing a cap including a light-transmissive member having a first main surface and a second main surface, and a light blocking film arranged on a part of the second main surface;
forming a mark representing prescribed information by processing a part of the light blocking film;
preparing a package defining a recess, and at least one laser element disposed in the recess; and
fixing the second main surface of the cap to the package so as to cover the recess.
13. The method for manufacturing the light emitting device according to claim 12 , wherein
the forming of the mark includes forming the mark by irradiating the light blocking film with a processing laser beam from a first main surface side of the light-transmissive member.
14. The method for manufacturing the light emitting device according to claim 13 , wherein
the forming of the mark includes
disposing a suction device on a second main surface side of the light-transmissive member, and
sucking up processing dust generated by irradiation of the processing laser light by using the suction device while the mark is formed by the irradiation of the processing laser light.
15. The method for manufacturing the light emitting device according to claim 12 , wherein
the forming of the mark includes forming a machine-readable code as the mark.