LED HEAT SINK MODULE, LED MODULE FOR LED HEAT SINK MODULE

• US 20100270922A1
• Filed: 04/16/2010
• Published: 10/28/2010
• Est. Priority Date: 04/28/2009
• Status: Active Grant

• Current Assignee: Kwo Ger Metal Technology, Inc.
• Original Assignee: Kwo Ger Metal Technology, Inc.
• Inventors: LIN, Hsuan-Chih
• Granted Patent: US 8,342,716 B2
• Time in Patent Office: Days
• US Class Current: 315/32
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21V 29/77 with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21V 31/005 Sealing arrangements therefor
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A LED head sink module includes a LED module, which comprises a circuit substrate, a LED chip installed in the circuit substrate, a packing cup molded on the circuit substrate around the LED chip and a lens molded on the packing cup over the LED chip, a heat sink, which has a base and a flat mounting block located on the bottom side of the base for stopping against the circuit substrate of the LED module for absorbing waste heat, a bracket, which has a center opening that receives the circuit substrate of the LED module, first retaining members for fastening to a retaining portion at the periphery of the packing cup and second retaining members for fastening to the flat mounting block of the heat sink, and a water seal sandwiched between the LED module and the bracket to seal off outside moisture and dust.

Claims

1. A LED heat sink module, comprising:

a LED module, said LED module comprising a circuit substrate, said circuit substrate having opposing first and second bearing walls, at least one LED chip installed in said first bearing wall of said circuit substrate, a packing cup molded on said circuit substrate around said at least one LED chip, said packing cup having a retaining portion located on the periphery thereof, and a lens molded on said packing cup over said at least one LED chip;

a heat sink adapted for dissipating waste heat from said LED module, said heat sink comprising a base and a flat mounting block located on a bottom side of said base, said flat mounting block having a flat contact face adapted for stopping against said second bearing wall of said circuit substrate of said LED module; and

a bracket adapted for securing said LED module to said head sink, said bracket comprising a center opening for receiving said circuit substrate of said LED module, a plurality of first retaining members equiangularly spaced around a bottom side thereof and adapted for securing said retaining portion of said packing cup and a plurality of second retaining members equiangularly spaced around a top side thereof and adapted for securing said flat mounting block of said heat sink.

2. The LED heat sink module as claimed in claim 1, wherein said LED module further comprises a plurality of conducting terminals electrically connected to said at least one LED chip and suspending at two opposite sides of said circuit substrate;

said bracket carries a plurality of electrodes adapted for connecting said conducting terminals electrically;

said heat sink carries a power control module electrically connectable to said conducting terminals and adapted for controlling the operation of said at least one LED chip of said LED module.

3. The LED heat sink module as claimed in claim 2, wherein said heat sink has a through hole cut through said base and said flat mounting block;

said power control module comprises a control circuit board, a first electrical connector installed in said control circuit board, a second electrical connector detachably connectable to said first electrical connector and having positive and negative electrical wires thereof inserted through the through hole of said heat sink and respectively electrically connected to said positive and negative electrodes at said bracket.

4. The LED heat sink module as claimed in claim 3, wherein said heat sink comprises a plurality of mounting holes located on a top side of the base thereof opposite to said flat mounting block;

said control circuit board of said power control module has a plurality of mounting through holes corresponding to the mounting holes of said base of said heat sink;

said power control module further comprises a cover shell capped on said base of said heat sink over said control circuit board and said first electrical connector, said cover shell comprising a locating groove on a bottom edge thereof and a plurality of mounting through holes corresponding to the mounting through holes of said control circuit board, a water seal ring mounted in said locating groove of said cover shell and stopped between said cover shell and said base of said heat sink, and a plurality of fastening members respectively inserted through the mounting through holes of said cover shell and the mounting through holes of said control circuit board and driven into the mounting holes on the top side of said base of said heat sink to affix said cover shell to said heat sink.

5. The LED heat sink module as claimed in claim 1, wherein said retaining portion of said packing cup is a retaining groove extending around the periphery of said packing cup;

each said first retaining member of said bracket comprises a hooked portion for hooking in said retaining groove of said retaining portion of said packing cup.

6. The LED heat sink module as claimed in claim 1, wherein said packing cup comprises an endless locating groove located on a bottom wall thereof around said circuit substrate, and a water seal ring positioned in said endless locating groove for stopping against said bracket.

7. The LED heat sink module as claimed in claim 1, wherein said circuit substrate further comprises a thermal pad covered on the second bearing wall thereof and adapted for stopping against the flat contact face of said flat mounting block of said heat sink.

8. The LED heat sink module as claimed in claim 1, wherein said heat sink further comprises a plurality of radiation fins radially extended from the periphery of said base, and a retaining groove extending around the periphery of said flat mounting block;

each said second retaining member of said bracket comprises a hooked portion for hooking in the retaining groove at the periphery of said flat mounting block.

9. The LED heat sink module as claimed in claim 1, further comprising a waterproof adhesive applied to the space between said bracket and said heat sink.

10. The LED heat sink module as claimed in claim 1, wherein said LED module further comprises a barrel-like hold-down member fastenable to the periphery of said packing cup and the periphery of said bracket to hold down the connection between the first retaining members of said bracket and the retaining portion of said LED module and the connection between the second retaining members of said bracket and the flat mounting block of said heat sink, said barrel-like hold-down member comprising a center opening, a female engagement portion located on an inside wall around the center opening thereof and an inside annular stop flange radially inwardly protruded from the inside wall and suspending at a bottom side of the center opening below said female engagement portion;

said packing cup comprises a rib protruded from and extending around the periphery thereof for stopping against the inside annular stop flange of said barrel-like hold-down member;

said bracket comprises a male engagement portion located on the periphery thereof for engagement with the female engagement portion of said barrel-like hold-down member.

11. The LED heat sink module as claimed in claim 10, wherein said female engagement portion of said barrel-like hold-down member is an inner thread, and said male engagement portion of said bracket is an outer thread for mesh with the inner thread of said female engagement portion.

12. The LED heat sink module as claimed in claim 10, wherein said female engagement portion of said barrel-like hold-down member is a groove, and said male engagement portion of said bracket is a tooth for engaging the groove of said female engagement portion.

13. The LED heat sink module as claimed in claim 1, wherein said at least one LED chip is selected from a group consisting of high-power LED chips, low-power LED chips and color LED chips, and bonded to said circuit substrate by means of surface mount technology.

14. The LED heat sink module as claimed in claim 1, wherein said circuit substrate of said LED module is selected from a group consisting of copper-based high conduction substrate, aluminum-based high conduction substrate, ferrite-based high conduction substrate and ceramics base copper-clad high conduction substrate.

15. The LED heat sink module as claimed in claim 1, wherein said heat sink is prepared from a thermally conductive material selected from the group consisting of copper, aluminum and graphite.

16. A LED module, comprising:

a circuit substrate, said circuit substrate having two opposing bearing walls;

a plurality of tubular conducting terminals fixedly fastened to said circuit substrate for connection to an external power source;

at least one LED chip installed in one said bearing wall of said circuit substrate and electrically connected to said tubular conducting terminals;

a packing cup molded on said circuit substrate around said at least one LED chip, said packing cup having a retaining portion located on the periphery thereof; and

a lens molded on said packing cup over said at least one LED chip.

17. The LED module as claimed in claim 16, further comprising a bracket fastened to said packing cup and adapted for securing said LED module to an external head sink, said bracket comprising a center opening for receiving said circuit substrate, a plurality of first retaining members equiangularly spaced around a bottom side thereof and fastened to said retaining portion of said packing cup.

18. The LED module as claimed in claim 17, further comprising an annular circuit board mounted on said bracket around the center opening of said bracket, and a plurality of electrodes electrically soldered to said annular circuit board and respectively electrically plugged into said tubular conducting terminals.

19. The LED module as claimed in claim 17, wherein said retaining portion of said packing cup is a retaining groove extending around the periphery of said packing cup;

each said first retaining member of said bracket comprises a hooked portion for engaging the retaining groove of said retaining portion of said packing cup.

20. The LED module as claimed in claim 16, wherein said packing cup comprises an endless locating groove located on a bottom wall thereof around said circuit substrate, and a water seal ring positioned in said endless locating groove.

21. The LED module as claimed in claim 16, wherein said circuit substrate is selected from a group consisting of copper-based high conduction substrate, aluminum-based high conduction substrate, ferrite-based high conduction substrate and ceramics base copper-clad high conduction substrate.