| CPC H10H 20/856 (2025.01) [H01L 25/0753 (2013.01); H10H 20/0363 (2025.01)] | 16 Claims |
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1. A light emitting device comprising:
a substrate;
a plurality of first light emitting elements, each of which is mounted on the substrate, has a first LED die, and emits light having a first wavelength;
a first light transmitting layer arranged so as to cover the plurality of first light emitting elements, the first light transmitting layer transmitting light emitted from the plurality of first light emitting elements;
a second light transmitting layer arranged so as to cover the first light transmitting layer, the second light transmitting layer transmitting light that has transmitted through the first light transmitting layer; and
a reflector having an upwardly bulging curved surface at an upper portion of an inner wall that the first light transmitting layer and the second light transmitting layer contact, the reflector being arranged on the substrate so as to surround the plurality of first light emitting elements and reflecting light emitted from the first light emitting elements, wherein
the thickness T between the upper surfaces of the first LED dies and the upper surface of the first light transmitting layer is greater than a thickness T1 defined as
 wherein LG1 is the distance between the first LED dies, and θc is a critical angle for the case where light is emitted from the first light transmitting layer to air,
the horizontal distance between a second contact part, where the top of the second light transmitting layer contacts the curved surface of the reflector, and the bottom of the inner wall of the reflector is greater than the horizontal distance between a first contact part, where the top of the first light transmitting layer contacts the reflector, and the bottom of the inner wall of the reflector,
the first light transmitting layer contacts the curved surface at the first contact part in the vicinity of the upper surface of the reflector,
the first light transmitting layer extends from the first contact part in a direction inclined by the contact angle of the uncured resin of the first light transmitting layer with respect to the reflector and an angle corresponding to the tangential direction at the first contact part, and
the first light transmitting layer at the center of a mounting region where the plurality of first light emitting elements is mounted is thinner than the first light transmitting layer at the first contact part.
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