LIGHT EMITTING DIODE BULB WITH CENTRAL AXIS BIDIRECTIONAL CONVECTION HEAT DISSIPATION STRUCTURE

• US 20150338028A1
• Filed: 07/31/2015
• Published: 11/26/2015
• Est. Priority Date: 12/23/2013
• Status: Abandoned Application

• Current Assignee: Skynet Electronic Company Limited
• Original Assignee: Skynet Electronic Company Limited
• Inventors: LIANG, Jim-Hung
• Application Number:
  US14/814,611
• Publication Number:
  US 20150338028A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21V 17/002 with provision for interchangeability, i.e. component parts being especially adapted to be replaced by another part with the same or a different function F21V17/10 takes precedence
• CPC Class Codes: F21V 19/004 by deformation of parts or snap action mountings, e.g. using clips
• CPC Class Codes: F21V 29/503 of light sources cooling arrangements structurally associated with gas-discharge or vapour-discharge lamps H01J61/52; cooling arrangements structurally associated with electric incandescent lamps H01K1/58; cooling arrangements structurally associated with light-emitting diodes H01L33/64
• CPC Class Codes: F21V 29/506 of globes, bowls or cover glasses
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21Y 2107/40 on the sides of polyhedrons, e.g. cubes or pyramids
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED bulb includes a lower cover having ventilation holes formed at outer periphery thereof, and a first coupling opening formed at top side thereof; a separating unit provided within the lower cover at a position between lower edges of the ventilation holes and bottom side of the lower cover, and having a convection pathway formed at top side thereof; a heat sink having bottom end positioned on top side of the separating unit; and an upper cover having top side formed with convection hole corresponding to top end of the heat sink, and a second coupling opening formed at bottom side thereof. When the second and first coupling openings are coupled with each other, the upper and lower covers are assembled together to form a central axis bidirectional convection heat dissipation pathway sequentially through the ventilation hole, the convection pathway, the heat sink and the ventilation hole accordingly.

Claims

1. A light emitting diode (LED) bulb with a bidirectional convection heat dissipation structure, the LED bulb comprising:

a bulb socket having two electrodes;

a cover made of a light permeable material, and having a receiving space therein and a bottom side provided on a top side of the bulb socket, wherein the outer periphery of the cover adjacent to the bottom side thereof is provided with at least one ventilation hole, and a top side of the cover is formed with at least one convection hole, so as to allow air inside and outside of the cover to communicate with each other through the ventilation hole and convection hole;

a separating unit provided at a position between the lower edge of the ventilation hole and the bulb socket;

a driving circuit board provided at a position between the separating unit and the bulb socket, wherein the driving circuit board is electrically connected to the electrodes, respectively; and

at least one LED circuit board provided within the receiving space and electrically connected to the driving circuit board, wherein the bottom end of the LED circuit board is positioned on the top side of the separating unit such that the LED circuit board can communicate with the cold ambient air outside the bulb through a bidirectional convection heat dissipation pathway formed by the ventilation hole, the receiving space between the LED circuit board and the cover, and the convection hole.

2. The LED bulb of claim 1, wherein the separating unit has a top side provided within the receiving space at a position above the upper edge of the ventilation hole, and is formed with at least one convection pathway which can communicate with the top side of the separating unit and the ventilation hole, respectively, such that the LED circuit board can communicate with the cold ambient air outside the bulb through the bidirectional convection heat dissipation pathway formed by the ventilation hole, the convection pathway, the receiving space between the LED circuit board and the cover, and the convection hole.

3. The LED bulb of claim 2, wherein the separating unit includes:

a base plate provided at a position between the lower edge of the ventilation hole and the driving circuit board; and

a plurality of ventilation ribs each having a bottom end fixed to the top side of the base plate and a top end extending to a position within the receiving space and above the upper edge of the ventilation hole, wherein the ventilation ribs are configured to form the convection pathway for allowing the ventilation hole to communicate with the top side of the separating unit through the convection pathway.

4. The LED bulb of claim 2, the separating unit includes:

a first separating plate provided at a position between the lower edge of the ventilation hole and the driving circuit board; and

a second separating plate provided within the receiving space at a position above the upper edge of the ventilation hole, so as to form a ventilation space between the second separating plate and the first separating plate, wherein the second separating plate is formed with at least one penetrating hole thereon, thereby allowing the ventilation space to communicate with the penetrating hole for forming the convection pathway.

5. The LED bulb of claim 3, wherein the cover further includes at least one positioning rib formed at a position adjacent to the convection hole and extending toward the receiving space, wherein an end of the positioning rib away from the convection hole is in contact against the top end of the LED circuit board.

6. The LED bulb of claim 4, wherein the cover further includes at least one positioning rib formed at a position adjacent to the convection hole and extending toward the receiving space, wherein an end of the positioning rib away from the convection hole is in contact against the top end of the LED circuit board.

7. A light emitting diode (LED) bulb with a bidirectional convection heat dissipation structure, the LED bulb comprising:

a bulb socket having two electrodes;

a cover made of a light permeable material, and having a receiving space therein and a bottom side provided on a top side of the bulb socket, wherein the outer periphery of the cover adjacent to the bottom side thereof is provided with at least one ventilation hole, and a top side of the cover is formed with at least one convection hole, so as to allow air inside and outside of the cover to communicate with each other through the ventilation hole and convection hole;

a separating unit provided at a position between the lower edge of the ventilation hole and the bulb socket;

a driving circuit board provided at a position between the separating unit and the bulb socket, wherein the driving circuit board is electrically connected to the electrodes, respectively;

a heat sink provided within the receiving space and made of a thermally conductive material having a thermal conductivity coefficient higher than that of the cover, wherein the bottom end of the heat sink is positioned on the top side of the separating unit; and

at least one LED circuit board attached to the heat sink and electrically connected to the driving circuit board, such that the heat sink and the LED circuit board can communicate with the cold ambient air outside the bulb through a bidirectional convection heat dissipation pathway formed by the ventilation hole, the receiving space between the LED circuit board and the cover, and the convection hole.

8. The LED bulb of claim 7, wherein the separating unit has a top side provided within the receiving space at a position above the upper edge of the ventilation hole, and is formed with at least one convection pathway which can communicate with the top side of the separating unit and the ventilation hole, respectively, such that the heat sink and the LED circuit board can communicate with the cold ambient air outside the bulb through the bidirectional convection heat dissipation pathway formed by the ventilation hole, the convection pathway, the receiving space between the LED circuit board and the cover, and the convection hole.

9. The LED bulb of claim 8, wherein the separating unit includes:

a base plate provided at a position between the lower edge of the ventilation hole and the driving circuit board; and

a plurality of ventilation ribs each having a bottom end fixed to the top side of the base plate and a top end extending to a position within the receiving space and above the upper edge of the ventilation hole, wherein the ventilation ribs are configured to form the convection pathway for allowing the ventilation hole to communicate with the top side of the separating unit through the convection pathway.

10. The LED bulb of claim 8, wherein the separating unit includes:

a first separating plate provided at a position between the lower edge of the ventilation hole and the driving circuit board; and

a second separating plate provided within the receiving space at a position above the upper edge of the ventilation hole, so as to form a ventilation space between the second separating plate and the first separating plate, wherein the second separating plate is formed with at least one penetrating hole thereon, thereby allowing the ventilation space to communicate with the penetrating hole for forming the convection pathway.

11. The LED bulb of claim 9, wherein the cover further includes at least one positioning rib formed at a position adjacent to the convection hole and extending toward the receiving space, wherein an end of the positioning rib away from the convection hole is in contact against the top end of the heat sink.

12. The LED bulb of claim 10, wherein the cover further includes at least one positioning rib formed at a position adjacent to the convection hole and extending toward the receiving space, wherein an end of the positioning rib away from the convection hole is in contact against the top end of the heat sink.