Street lamp with enchanced heat dissipation
View Patent ↗A light-emitting device including a lamp cover, a transparent front cover, a light-emitting element, a radiation layer and a reflective layer is provided. The transparent front cover and the lamp cover are combined together and form a cavity therein. The light-emitting element is disposed on the lamp cover and located within the cavity. The light-emitting element is used for emitting a light towards the transparent front cover. The radiation layer is formed on the lamp cover and the reflective layer is formed on the radiation layer.
1. A light-emitting device, comprising:
a lamp cover;
a transparent front cover combined with the lamp cover, wherein there is a cavity between the transparent front cover and the lamp cover;
a circuit board directly disposed on an inner surface of the lamp cover and located within the cavity;
a plurality of light-emitting elements disposed on the circuit board and located within the cavity, wherein lights emitted by the plurality of light-emitting elements are outputted through the transparent front cover;
a single lens covering every light-emitting element and located within the cavity;
a radiation layer formed next to the circuit board and directly formed on the inner surface of the lamp cover covered by the cavity; and
a reflective layer directly formed on the radiation layer,
wherein the radiation layer is further formed on an outer surface of the lamp cover.
2. The light-emitting device according to claim 1 , wherein a heat radiation efficiency of the lamp cover is smaller than a heat radiation efficiency of the radiation layer.
3. The light-emitting device according to claim 1 , wherein a surface of the single lens has a series of convex portions and each convex portion is corresponding to the position of one light-emitting element.
4. The light-emitting device according to claim 1 , wherein a reflectivity of the reflective layer is larger than 85%.
5. The light-emitting device according to claim 1 , wherein the reflective layer is made of a material comprising titanium oxide or zinc oxide.
6. The light-emitting device according to claim 5 , wherein a weight percentage of the titanium oxide or a weight percentage of zinc oxide ranges between 0.5% and 15%.
7. The light-emitting device according to claim 1 , wherein the radiation layer and the reflective layer are separated by an interface.
8. The light-emitting device according to claim 1 , wherein the radiation layer and the reflective layer are two different layers.
9. The light-emitting device according to claim 1 , wherein the sum of the thickness of the radiation layer and the thickness of the reflective layer ranges between 60 and 200 μm.
10. A light-emitting device, comprising:
a lamp cover;
a transparent front cover combined with the lamp cover, wherein there is a cavity between the transparent front cover and the lamp cover;
a circuit board directly disposed on an inner surface of the lamp cover and located within the cavity;
a plurality of light-emitting elements disposed on the circuit board and located within the cavity, wherein lights emitted by the plurality of light-emitting elements are outputted through the transparent front cover;
a single lens covering every light-emitting element and located within the cavity;
a radiation layer formed next to the circuit board and directly formed on the inner surface of the lamp cover covered by the cavity; and
a reflective layer directly formed on the radiation layer,
wherein the radiation layer is further formed on the inner surface of the lamp cover not covered by the cavity.