Lighting device and light emitting module for the same

Abstract

A light emitting module of a lighting device has a casing, a heat radiating member and terminals. The terminals extend from the casing and connects to a circuit board disposed along a light diffusing member. The heat radiating member extends in a direction perpendicular to the terminals. Alternatively, the terminals are connected to heat radiating lands formed on a second circuit board that is provided separately from a first circuit board and the heat radiating member is connected to a heat radiating land formed on the second circuit board. Further, the heat radiating member can be connected to a heat radiating plate overlapping with the second circuit board, in place of the heat radiating land.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Other objects, features and advantages of the present invention will become more apparent from the following detailed description made with reference to the accompanying drawings, in which like parts are designated by like reference numbers and in which:

FIG. 1 is a side view of a back light device according to a first embodiment of the present invention;

FIG. 2 is a perspective view of a light emitting diode module of the back light device according to the first embodiment;

FIG. 3 is an end view of the back light device when viewed along an arrow III in FIG. 1;

FIG. 4 is a schematic cross-sectional view of the light emitting diode module according to the first embodiment;

FIG. 5 is a top view of the light emitting diode module with a second heat radiating member when viewed along an arrow V in FIG. 1;

FIG. 6 is a top view of the light emitting diode module and another example of the second heat radiating member according to the first embodiment;

FIG. 7 is a side view of a back light device according to a second embodiment of the present invention;

FIG. 8 is a perspective view of a light emitting diode module of the back light device mounted to a second board according to the second embodiment;

FIG. 9 is a schematic side view of the light emitting diode module mounted to the second board according to the second embodiment;

FIG. 10 is an enlarged partial perspective view of a light emitting diode module mounted to a second board according to a third embodiment of the present invention;

FIG. 11 is an enlarged partial perspective view of a light emitting diode module mounted to a second board according to a fourth embodiment of the present invention;

FIG. 12 is an enlarged partial perspective view of a light emitting diode module mounted to a second board according to a fifth embodiment of the present invention;

FIG. 13 is a side view of a back light device according to a sixth embodiment of the present invention;

FIG. 14 is a perspective view of light emitting diode modules and a second board of the back light device according to the sixth embodiment;

FIG. 15 is an enlarged partial perspective view of the light emitting diode module and the second board according to the sixth embodiment;

FIG. 16 is an enlarged partial perspective view of the light emitting diode module and another example of the second board according to the sixth embodiment;

FIG. 17 is an enlarged partial perspective view of a light emitting diode module and a second board according to a seventh embodiment of the present invention;

FIG. 18 is an enlarged partial perspective view of a light emitting diode module and a second board according to an eighth embodiment of the present invention;

FIG. 19 is a perspective view of light emitting diode modules and a second board of a back light device according to a ninth embodiment of the present invention; and

FIG. 20 is a schematic cross-sectional view of the light emitting diode module and the second board taken along a line XX-XX in FIG. 19.

Claims

1. A lighting device comprising: a light emitting module for emitting light;a circuit board for driving the light emitting module; anda light diffusing member disposed along the circuit board for diffusing the light emitted from the light emitting module therein, the light diffusing member having a light incident surface through which the light enters and a light radiating surface through which the light diffused therein is radiated toward a radiation area, whereinthe light emitting module has a light emitting element that emits the light, a casing that houses the light emitting element, a terminal that extends from the casing and electrically connects to the circuit board and a first heat radiating member that extends in a direction perpendicular to the terminal.

2. The lighting device according to claim 1, wherein the terminal has a bend portion.

3. The lighting device according to claim 1, wherein the first heat radiating member has a surface and the casing has a holding portion that holds the first heat radiating member such that the surface is entirely exposed from the casing.

4. The lighting device according to claim 3, further comprising: a second heat radiating member that covers the surface of the first heat radiating member.

5. The lighting device according to claim 1, wherein the first heat radiating member has an exterior portion that extends outside of the casing in a direction perpendicular to an optical axis of the light emitted from the light emitting module.

6. The lighting device according to claim 1, further comprising: a second heat radiating member disposed in contact with the first heat radiation member, wherein the second heat radiating member has a heat radiating area larger than that of the first heat radiating member.

7. The lighting device according to claim 1, wherein the first heat radiating member has a first exterior portion and a second exterior portion located on opposite sides of the casing, and the first exterior portion and the second exterior portion have symmetrical shape with respect to an optical axis of the light emitted from the light emitting module.

8. The lighting device according to claim 1, wherein the light diffusing member includes a light conducting plate having a first surface and a second surface, a reflecting sheet disposed on the first surface of the light conducting plate and a light diffusing sheet disposed on the second surface of the light conducting plate.

9. A light emitting module for a lighting device that has a circuit board for driving the light emitting module and a light diffusing member disposed along the circuit board, the light emitting module comprising: a light emitting element for emitting light;a casing housing the light emitting element;a terminal extending from the casing to be electrically connected to the circuit board; anda first heat radiating member extending in a direction perpendicular to the terminal.

10. The light emitting module according to claim 9, wherein the terminal has a bend.

11. The light emitting module according to claim 9, wherein the heat first heat radiating member has a surface and the casing has a holding portion that holds the first heat radiating member such that the surface is entirely exposed from the casing.

12. The light emitting module according to claim 11, further comprising: a second heat radiating member that covers the surface of the first heat radiating member.

13. The light emitting module according to claim 9, wherein the first heat radiating member has an exterior portion that extends outside of the casing in a direction perpendicular to an optical axis of the light emitted from the light emitting element.

14. The light emitting module according to claim 9, further comprising: a second heat radiating member disposed in contact with the first heat radiating member, whereinthe second heat radiating member has a heat radiating area larger than that of the first heat radiating member.

15. The light emitting module according to claim 9, wherein the first heat radiating member has a first exterior portion and a second exterior portion on opposite sides of the casing, and the first exterior portion and the second exterior portion have symmetrical shape with respect to an optical axis of the light emitted from the light emitting element.

16. A lighting device comprising: a circuit board having a metal base, a heat radiating land and a conducting land, the heat radiating land disposed such that its end is aligned with an end of the metal base, and the conducting land disposed opposite to the end of the metal base with respect to the heat radiating land;a light emitting module for emitting light, the light emitting module has a casing, a heat radiating member, and a terminal, whereinthe casing has a first surface through which the light is emitted and a second surface opposite to the first surface and joined to the circuit board,the heat radiating member is disposed to the casing such that at least a part of the heat radiating member is exposed from the casing and connected to the heat radiating land, andthe terminal extends from the casing and connects to the conducting land.

17. The lighting device according to claim 16, wherein the terminal extends from the casing in a direction opposite to the end of the metal base.

18. The lighting device according to claim 16, wherein the terminal extend from the casing in a direction parallel to the end of the metal base.

19. The lighting device according to claim 16, wherein the casing defines an opening on the second surface, and the heat radiating member is received in the opening.

20. The lighting device according to claim 16, wherein the casing defines an opening on the second surface,the heat radiating member has an interior portion disposed in the opening of the casing such that a surface of the interior portion is exposed from the casing, andthe casing is mounted to the circuit board such that the opening is covered by the heat radiating land and the surface of the interior portion contacts the heat radiating land.

21. The lighting device according to claim 16, wherein the heat radiating member has an interior portion disposed in the casing and an exterior portion extending from the interior portion and located outside of the casing, andthe exterior portion extends in a direction parallel to the end of the metal base.

22. The lighting device according to claim 21, wherein the exterior portion is in contact with the heat radiating land.

23. The lighting device according to claim 16, further comprising: a light diffusing member for diffusing light therein, wherein the light diffusing member has a light incident surface for allowing light to enter therein and a light radiating surface perpendicular to the light incident surface for radiating the light diffused therein toward a radiation area, whereinthe circuit board is disposed parallel to the light incident surface.

24. A lighting device comprising: a circuit board;a heat radiating plate overlapping the circuit board, the heat radiating plate has an exposed portion that is exposed from the circuit board; anda light emitting module having a casing, a heat radiating member and a terminal extending from the casing, whereinthe heat radiating member Is disposed to the casing such that at least a part of the heat radiating member is exposed from the casing and connected to the exposed portion of the heat radiating plate, andthe terminal is connected to the circuit board.

25. The lighting device according to claim 24, wherein the circuit board has a first surface and a second surface, the terminal is connected to the first surface of the circuit board, and the heat radiating plate overlaps the second surface of the circuit board.

26. The lighting device according to claim 24, wherein the heat radiating plate is offset from the circuit board.

27. The lighting device according to claim 24, wherein the exposed portion of the heat radiating plate has a thickness greater than that of the other portion of the heat radiating plate, and the exposed portion has a surface that shares a plane with a surface of the circuit board.

28. The lighting device according to claim 24, further comprising: a second circuit board having a connector, wherein the circuit board has a connecting portion, and the connecting portion is received in the connector of the second circuit board.

29. The lighting device according to claim 24, wherein the casing has an outer wall and the casing is disposed such that the outer wall is aligned with an end of the heat radiating plate.

30. The lighting device according to claim 24, wherein the heat radiating plate overlaps the circuit board such that its end is aligned with an end of the circuit board,the circuit board has a notch at the end such that the exposed portion of the heat radiating plate is exposed through the notch, andthe casing is received in the notch and fixed to the exposed portion of the heat radiating plate.

31. A lighting device comprising: a circuit board having a first surface and a second surface;a heat radiating plate disposed along the first surface of the circuit board and offset from the circuit board such that a part of the heat radiating plate is exposed from the circuit board, the heat radiating plate defining an opening in the part exposed from the circuit board; anda light emitting module for emitting light, the light emitting module having a casing, a heat radiating member, and a terminal, whereinthe casing has a light emitting portion through which the light is emitted, the casing is disposed such that the light emitting portion corresponds to the opening of the heat radiating plate,the heat radiating member is disposed to the casing such that at least a part of the heat radiating member is exposed from the casing and connected to the heat radiating plate, andthe terminal extends from the casing and connects to the second surface of the circuit board.