LED illuminating device and lamp unit thereof

• US 7,988,335 B2
• Filed: 06/05/2009
• Issued: 08/02/2011
• Est. Priority Date: 01/10/2009
• Status: Expired due to Fees

• Current Assignee: Foxconn Technology Co., Ltd., Fuzhun Precision Industry Company Limited (Foxconn Technology Co., Ltd.)
• Original Assignee: Foxconn Technology Co., Ltd., Fuzhun Precision Industry Company Limited (Foxconn Technology Co., Ltd.)
• Inventors: Xiong, Ying, Tian, Feng, Liu, Tay-Jian
• Primary Examiner(s): DZIERZYNSKI, EVAN P
• Application Number:
  US12/478,772
• Publication Number:
  US 20100177514A1
• Time in Patent Office: 788 Days
• Field of Search: 362/294, 362/373, 362/249.02, 362/362, 362/240, 362/800, 362/218
• US Class Current: 362/294
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• CPC Class Codes: F21S 8/04 intended only for mounting on a ceiling or the like overhead structures F21S8/02 takes precedence; details of ceiling bases F21V21/03
• CPC Class Codes: F21V 29/51 using condensation or evaporation of a fluid, e.g. heat pipes
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/75 with fins or blades having different shapes, thicknesses or spacing
• CPC Class Codes: F21V 29/76 with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
• CPC Class Codes: F21V 29/763 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2107/10 on concave supports or substrates, e.g. on the inner side of bowl-shaped supports
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

An LED illuminating device includes a mounting module and a lamp unit mounted in the mounting module. The lamp unit includes a light-emitting module and a heat sink. The light-emitting module includes a light source having a plurality of LEDs, and a light penetrable cover located below the light source and defining a plurality of air venting holes therein. The heat sink includes an elongated base defining a plurality of air exchanging holes therein and a plurality of fins. The base has an outer convex surface and an opposite inner concave surface defining an elongated recess. The light source is received in the recess and thermally attached to the concave surface. Air flows into and out of a chamber defined between the base and the cover via the venting holes of the cover and the air exchanging holes of the base.

Claims

1. A lamp unit, comprising:

a light-emitting module comprising a light source having a plurality of LEDs and a light penetrable cover defining a plurality of air venting holes therein; and

a heat sink arranged above the light-emitting module, the heat sink comparing a elongated base and a plurality of fins formed on the base, the base having an outer convex surface formed at a top side thereof and an opposite inner concave surface formed at a bottom side thereof, the fins extending upwardly from the convex surface of the base, the concave surface defining an elongated recess extending along a longitudinal direction of the base, a light emitting window being defined between two opposite lateral sides of the base and located below the concave surface, the light source being received in the elongated recess of the base and thermally attached to the concave surface, the base of the heat sink defining a plurality of air exchanging holes through the convex surface and the concave surface, the light penetrable cover being located below of the light source, the light penetrable cover attached to the base, the light penetrable cover and the concave surface of the base cooperatively defining a chamber, air flowing into and out of the chamber via the venting holes of the light penetrable cover and exchanging holes of the base, heat generated by the LEDs of the light source being dissipated via the heat sink and via air flowing through the chamber, light emitted by the LEDs of the light source being guided to outside via the light penetrable cover.

2. The lamp unit of claim 1, wherein the concave surface of the base comprises a horizontal first plane at a top thereof and two sloping second planes located below and at two opposite lateral sides of the first plane, the two second planes extending outwardly and downwardly from the two opposite lateral sides of the first plane, respectively, the LEDs of the light source being attached to the first plane and thermally connecting therewith.

3. The lamp unit of claim 2, wherein the air exchanging holes of the base are located at two lateral sides of the first plane and evenly spaced from each other along the base.

4. The lamp unit of claim 2, wherein the light-emitting module further comprises two auxiliary light sources received in the elongated recess of the base and attached to the two second planes and thermally connecting therewith.

5. The lamp unit of claim 1, wherein the concave surface is substantially V-shaped and comprises two sloping planes intersecting with each other, the LEDs of the light source being attached to the two sloping planes and thermally connecting therewith, the exchanging holes being located at a joint of the two sloping planes of the concave surface.

6. The lamp unit of claim 1, wherein the concave surface is arch-shaped, the LEDs of the source being evenly spaced from each other along a transverse direction of the base, the exchanging holes being evenly spaced from each other along the transverse direction of the base, each exchanging hole being located between two adjacent LEDs of the light source.

7. The lamp unit of claim 1, wherein the light source comprises at least one light bar, the light bar having an elongated substrate and the plurality of LEDs being arranged on the substrate.

8. The lamp unit of claim 1, further comprising at least one heat pipe arranged between the base and the light source, and thermally connecting with the light source.

9. The lamp unit of claim 1, wherein the air venting holes of the light penetrable cover are located adjacent to two opposite lateral sides of the light penetrable cover and evenly spaced from each other along the light penetrable cover.

10. The lamp unit of claim 1, wherein the fins extend vertically and upwardly from the concave surface of the base and are arranged symmetric to a longitudinal center line of the concave surface, a height of the fins decreasing from the longitudinal center line of the concave surface towards the two opposite lateral sides of the base.

11. An LED illumination device, comprising:

a mounting module comprising a lampshade defining a receiving space therein, the lampshade comprising a mounting plate and a sidewall expanding downwardly from a periphery of the mounting plate, the receiving space being cooperatively defined by the mounting plate and the sidewall; and

at least one lamp unit mounted on the lampshade, the at least one lamp unit comprising;

a light-emitting module comprising a light source having a plurality of LEDs and a light penetrable cover defining a plurality of air venting holes therein; and

a heat sink arranged above the light-emitting module, the heat sink comparing a elongated base and a plurality of fins formed on the base, the base having an outer convex surface formed at a top side thereof and an opposite inner concave surface formed at a bottom side thereof, the fins extending upwardly from the convex surface of the base, the concave surface defining an elongated recess extending along a longitudinal direction of the base, a light emitting window being defined between two opposite lateral sides of the base and below the concave surface, the light source being received in the elongated recess of the base and thermally attached to the concave surface, the base of the heat sink defining a plurality of air exchanging holes through the convex surface and the concave surface, the light penetrable cover being located below of the light source, the light penetrable cover being attached to the heat sink, the light penetrable cover and the concave surface of the base cooperatively defining a chamber, air flowing into and out of the chamber via the venting holes of the light penetrable cover and exchanging holes of the base, heat generated by the LEDs of the light source being dissipated via the heat sink and via air flowing through the chamber, light emitted by the LEDs of the light source being guided to outside via the light penetrable cover.

12. The LED illumination device of claim 11, wherein the mounting plate of the lampshade defines at least one elongated opening therein, the at least one lamp unit being located in the at least one elongated opening of the lampshade, a pair of mounting flanges extending respectively from the two opposite lateral sides of the base and abutting on the mounting plate to mount the lamp unit of the lampshade in the elongated opening, the light-emitting module of the at least one lamp unit being received at the at least one elongated opening of the lampshade, the fins of the heat sink of the at least one lamp unit being located above the mounting plate of the lampshade.

13. The LED illumination device of claim 12, wherein the mounting module further comprises a light distributing member accommodated in the receiving space of the lampshade, the light distributing member comprising a frame mounted to the sidewall of the lampshade, a plurality of elongated reflecting plates and a plurality of the elongated partition plates mounted in the frame, the reflecting plates being connected between two opposite sides of the frame and spaced from each other, an elongated cutout being defined between every two adjacent reflecting plates corresponding to the at least one elongated opening of the lampshade, the partition plates being perpendicular to and interconnected with the reflecting plates.

14. The LED illumination device of claim 11, wherein the at least one lamp unit further comprises two end covers mounted to two opposite longitudinal ends of the heat sink, each of the end covers defining a wire hole therein for electrical wires of the light source extending therethrough.

15. The LED illumination device of claim 11, wherein the light penetrable cover is substantially C-shaped, the base of the heat sink defining two engaging grooves in the two opposite lateral sides thereof, two lateral sides of the light penetrable cover being inserted in the two engaging grooves of the base, respectively.

16. The LED illumination device of claim 11, wherein the concave surface of the base comprises a horizontal first plane at a top thereof and two sloping second planes located below and at two opposite lateral sides of the first plane, the two second planes extending outwardly and downwardly from the two opposite lateral sides of the first plane, respectively, the LEDs of the light source being arranged on the first plane.

17. The LED illumination device of claim 16, wherein the light-emitting module further comprises two auxiliary light sources received in the elongated recess of the base and thermally attached to the two second planes.

18. The LED illumination device of claim 11, wherein the concave surface is substantially V-shaped and comprises two sloping planes intersecting with each other, the LEDs of the light source being arranged on the two sloping planes.

19. The LED illumination device of claim 11, wherein the concave surface is arch-shaped, the LEDs of the source being evenly spaced from each other along a transverse direction of the base.

20. The LED illumination device of claim 11, further comprising an electrical module mounted on the lampshade and electrically connected with the light source of the light-emitting module of the at least one lamp unit.