Lighting apparatus

1. A lighting apparatus for use in combination with another lighting apparatus, comprising:

a lighting unit comprising a substrate having a first end and a second end opposite to the first end, a light emitting element formed on the substrate, an electrode pad formed at the first end of the substrate, and a connection terminal formed at the second end of the substrate;

a housing unit that houses the lighting unit; and

a coupling unit coupled to the housing unit at the second end of the substrate;

wherein the lighting apparatus is vertically inserted to the another lighting apparatus through the coupling unit.

2. The lighting apparatus of claim 1 , wherein the first end of the substrate with the electrode pad is exposed to an exterior of the housing unit, a locking groove is formed on a side of the exposed first end of the substrate, and the coupling unit is coupled to the locking groove of the another lighting apparatus.

3. The lighting apparatus of claim 2 , wherein the housing unit comprises a coupling groove formed at a lower part of the housing unit, and the coupling unit has a coupling ledge inserted into the coupling groove.

4. The lighting apparatus of claim 1 , further comprises a diffusing unit to diffuse light generated from the light emitting element, wherein the housing unit has a first guiding groove formed at an upper part of the housing unit, and the diffusing unit is coupled to the first guiding groove.

5. The lighting apparatus of claim 3 , wherein the coupling unit comprises:

a body;

a pair of lateral projections facing each other and protruding from both sides of the body in a direction opposite to the housing unit;

two locking ledges facing each other and formed on an inner surface of each of the lateral projections;

a connection terminal inserting hole formed in the body, wherein the connection terminal is inserted into the connection terminal inserting hole and is exposed to the exterior of the housing unit; and

the coupling ledge protruding from the body toward the housing unit, the coupling ledge inserted into the coupling groove.

6. The lighting apparatus of claim 5 , wherein the coupling unit further comprises an elasticity-providing groove formed on each of the lateral projections to provide elasticity to the lateral projections.

7. The lighting apparatus of claim 5 , wherein the coupling unit further comprises a guide support that protrudes from the body toward the substrate, and configured to guide and support the connection terminal when the connection terminal is inserted into the connection terminal inserting hole.

8. The lighting apparatus of claim 1 , wherein the lighting apparatus further comprises a substrate support unit coupled to the housing unit, and configured to support the first end of the substrate on which the electrode pad is formed and exposed to an exterior of the housing unit.

9. The lighting apparatus of claim 8 , wherein the housing unit comprises a coupling groove formed at a lower part of the housing unit, and a first guiding groove formed at an upper surface of the housing unit.

10. The lighting apparatus of claim 9 , wherein the coupling unit comprises:

a body;

a pair of lateral projections facing each other and protruding from both sides of the body in a direction opposite to the housing;

two locking ledges facing each other and formed on an inner surface of each of the lateral projections;

an elasticity-providing groove formed on each of the lateral projections to provide elasticity to the lateral projections;

a connection terminal inserting hole formed in the body, wherein the connection terminal is inserted into the connection terminal inserting hole and is exposed to the exterior of the housing unit; and

a first coupling ledge protruding from the body toward the housing unit, the first coupling ledge inserted into the coupling groove.

11. The lighting apparatus of claim 10 , wherein the coupling unit further comprises a guide support that protrudes from the body toward the substrate, and configured to guide and support the connection terminal when the connection terminal is inserted into the connection terminal inserting hole.

12. The lighting apparatus of claim 10 , wherein the substrate support unit comprises:

a substrate seat that supports a lower surface of the first end of the substrate which is exposed to an exterior of the housing unit;

a second coupling ledge protruding from the substrate support unit toward the housing unit and inserted into the coupling groove; and

an inserting ledge formed in each side of the substrate seat to be inserted into an elasticity-providing groove of the another lighting apparatus.

13. The lighting apparatus of claim 12 , wherein the substrate support unit further comprises:

a pair of guiding members protruding from both sides of an upper rear surface of the substrate support unit toward the housing unit; and

a guiding member connector that connects the pair of the guiding members to each other.

14. The lighting apparatus of claim 9 , further comprising a diffusing unit to diffuse light generated from the light emitting element, the diffusing unit coupled to the first guiding groove.

15. The lighting apparatus of claim 1 , further comprising a magnet attached to a lower part of the housing unit.

16. A lighting apparatus for use in combination with another lighting apparatus, comprising:

a lighting unit comprising:

a substrate having a first end and a second end opposite to the first end, the substrate having a pair of locking grooves formed on both side of the substrate in the vicinity of the first end;

a light emitting element formed on the substrate;

an electrode pad formed at the first end of the substrate; and

a connection terminal formed at the second end of the substrate;

a housing unit that houses the lighting unit; and

a coupling unit coupled to the housing unit at the second end of the substrate, the coupling unit comprises:

a body;

a pair of lateral projections protruding from both sides of the body in a direction opposite to the housing;

a pair of locking ledges facing each other and protruding horizontally on the lateral projections to be coupled to a pair of locking grooves of another lighting apparatus; and

a connection terminal inserting hole formed in the body to receive the connection terminal.

17. The lighting apparatus of claim 16 , wherein the coupling unit further comprises an elasticity-providing groove formed on each of the lateral projections to provide elasticity to the lateral projections.

18. A lighting apparatus for use in combination with another lighting apparatus, comprising:

a lighting unit comprising:

a substrate having a first end and a second end opposite to the first end;

a light emitting element formed on the substrate;

an electrode pad formed at the first end of the substrate; and

a connection terminal formed at the second end of the substrate;

a housing unit that houses the lighting unit;

a coupling unit coupled to the housing unit at the second end of the substrate, the coupling unit comprises:

a body;

a pair of lateral projections protruding from both sides of the body in a direction opposite to the housing;

an elasticity-providing groove formed on each of the lateral projections to provide elasticity to the lateral projections; and

a connection terminal inserting hole formed in the body to receive the connection terminal; and

a substrate support unit coupled to the housing unit and configured to support the first end of the substrate on which the electrode pad is formed and exposed to an exterior of the housing unit, the substrate support unit comprising an inserting ledge formed on the substrate support unit to be inserted into an elasticity-providing groove of the another lighting apparatus.

19. The lighting apparatus of claim 18 , wherein the substrate has a pair of locking grooves formed on both side of the substrate in the vicinity of the first end, and the coupling unit has a pair of locking ledges facing each other and protruding horizontally on the lateral projections to be coupled to a pair of locking grooves of another lighting apparatus.