Lighting device including light-emitting element and method for manufacturing the same

1. A lighting device comprising:

a substrate including a circular mounting area, a first connecting electrode disposed on the substrate, and a second connecting electrode oppositely disposed on the substrate to the first connecting electrode across the circular mounting area; and

light-emitting elements mounted in the circular mounting area, wherein

the light-emitting elements each include a first electrode and a second electrode,

the light-emitting elements are divided into groups each including the same number of light-emitting elements,

the light-emitting elements within each group are electrically connected in series with one another by metallic wires and electrically connected in series to the first connecting electrode and to the second connecting electrode of the substrate,

the groups each including the same number of light-emitting elements are electrically connected in parallel between the first connecting electrode and the second connecting electrode, and

the first electrode and the second electrode of each light-emitting element in each group are positioned such that the first electrode is closer to a location where that group is electrically connected to the first connecting electrode than the second electrode.

2. The lighting device according to claim 1 ,

wherein all of the light-emitting elements are arranged to be directed in a same direction.

3. The lighting device according to claim 1 ,

wherein the light-emitting elements are arranged in lines that are extended in parallel with one another between the first connecting electrode and the second connecting electrode, including a central line extended in a central portion of the circular mounting area and a line of periphery positioned away from the central line, wherein the light-emitting elements in the central line outnumber the light-emitting elements in the line of periphery.

4. The lighting device according to claim 3 ,

wherein at least one group includes light-emitting elements from two or more lines.

5. The lighting device according to claim 3 ,

wherein the lines further include one or more intermediate lines extended between the first connecting electrode and the second connecting electrode and positioned between the central line and the line of periphery.

6. The lighting device according to claim 5 ,

wherein the number of light-emitting elements disposed in each line decreases from the central line through the intermediate line to the line of periphery.

7. The lighting device according to claim 1 ,

wherein the substrate further includes an opening that passes through the substrate from an upper surface to a lower surface of the substrate, and a metal base disposed in contact with the lower surface of the substrate, the opening of the substrate demarcates the circular mounting area in that an upper surface of the metal base appears, and the light-emitting elements are thermally connected to the upper surface of the metal base.

8. The lighting device according to claim 7 ,

wherein the upper surface of the metal base includes a layer of alumite treatment.

9. A lighting device comprising:

a substrate including a circular mounting area, a first connecting electrode disposed on the substrate, and a second connecting electrode oppositely disposed on the substrate to the first connecting electrode across the circular mounting area; and

light-emitting elements mounted in the circular mounting area and all of the light-emitting elements mounted to be directed in a same direction in the circular mounting area of the substrate between the first connecting electrode and the second connecting electrode disposed on the substrate,

the light-emitting elements are divided into groups each including the same number of light-emitting elements,

the light-emitting elements within each group are electrically connected in series with one another by metallic wires and electrically connected in series to the first connecting electrode and to the second connecting electrode of the substrate, and

the groups each including the same number of light-emitting elements are electrically connected in parallel between the first connecting electrode and the second connecting electrode.

10. The lighting device according to claim 9 ,

wherein the light-emitting elements are arranged in lines that are extended in parallel with one another between the first connecting electrode and the second connecting electrode, including a central line extended in a central portion of the circular mounting area and a line of periphery positioned away from the central line, wherein the light-emitting elements in the central line outnumbers the light-emitting elements in the line of periphery.

11. A method for manufacturing a lighting device comprising:

mounting light-emitting elements in a circular mounting area of a substrate between a first connecting electrode and a second connecting electrode oppositely disposed on the substrate, wherein each of the light-emitting elements includes a first electrode and a second electrode;

electrically connecting the light-emitting elements in series to form groups of light-emitting elements such that each group includes the same number of light-emitting elements; and

electrically connecting the groups in parallel between the first connecting electrode and the second connecting electrode,

wherein the first electrode and the second electrode of each light-emitting element in each group are positioned such that the first electrode is closer to a location where that group is electrically connected to the first connecting electrode than the second electrode.

12. The method according to claim 11 ,

wherein mounting light-emitting elements in the circular mounting area further comprises mounting the light-emitting elements in lines that are extended in parallel with one another between the first connecting electrode and the second connecting electrode, including a central line extended in a central portion of the circular mounting area and a line of periphery positioned away from the central line, wherein the light-emitting elements in the central line outnumber the light-emitting elements in the line of periphery.

13. A method for manufacturing a lighting device comprising:

mounting light-emitting elements in a circular mounting area of a substrate between a first connecting electrode and a second connecting electrode oppositely disposed on the substrate, wherein each of the light-emitting elements includes a first electrode and a second electrode;

electrically connecting the light-emitting elements in series to form groups of light-emitting elements such that each group includes the same number of light-emitting elements; and

electrically connecting the groups in parallel between the first connecting electrode and the second connecting electrode,

wherein all of the light-emitting elements are mounted to be directed in a same direction in the circular mounting area of the substrate between the first connecting electrode and the second connecting electrode disposed on the substrate.

14. The method according to claim 13 ,

wherein mounting light-emitting elements in the circular mounting area further comprises mounting the light-emitting elements in lines that are extended in parallel with one another between the first connecting electrode and the second connecting electrode, including a central line extended in a central portion of the circular mounting area and a line of periphery positioned away from the central line, wherein the light-emitting elements in the central line outnumber the light-emitting elements in the line of periphery.