# US 2015/0176830 A1 · Light emitting diode bulb with central axis bidirectional convection heat dissipation structure

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- Number: US 2015/0176830 A1
- Document ID: US20150176830A1
- Status: Published application
- Kind: A1
- Application number: 14/211,821
- Filed: 2014-03-14
- Published: 2015-06-25
- Earliest claimed: 2013-12-23
- Assignees: Skynet Electronic Co., Ltd.
- Applicants: Skynet Electronic Co., Ltd.
- Inventors: Jim-Hung LIANG
- Web page: https://patentgrep.com/patent/US20150176830A1

## CPC

- 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 H10H20/858)
- 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
- F21V 3/02: characterised by the shape
- 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)}
- F21V 19/004: {by deformation of parts or snap action mountings, e.g. using clips}
- F21V 29/83: the elements having apertures, ducts or channels, e.g. heat radiation holes
- F21V 29/506: of globes, bowls or cover glasses
- F21Y 2107/40: on the sides of polyhedrons, e.g. cubes or pyramids
- F21Y 2115/10: Light-emitting diodes [LED]
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## 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

### Claim 1

A light emitting diode (LED) bulb with a central axis bidirectional convection heat dissipation structure, the LED bulb comprising:
a lower cover (11, 21) made of a non-thermally conductive or insulating material and provided with a bulb socket (110, 210) on the outer bottom side of the lower cover (11, 21), wherein the lower cover (11, 21) is provided therein with a driving circuit board (111, 211) near the bottom side thereof, two electrodes (1101, 1102, 2101, 2102) of the bulb socket (110, 210) are separately and electrically connected to the driving circuit board (111, 211), the outer periphery of the lower cover (11, 21) is provided with at least one ventilation hole (112, 212) so as to allow inside and outside of the lower cover (11, 21) to communicate with each other through the ventilation hole (112, 212), and the top side of the lower cover (11, 21) is formed with a first coupling opening (113, 213);
a separating unit (12) having a bottom side provided within the lower cover (11, 21) at a position between the lower edge of the ventilation hole (112, 212) and the driving circuit board (111, 211), so as to confine the driving circuit board (111, 211) within the lower cover (11, 21) at a position near the bottom side of the lower cover (11, 21), wherein the separating unit (12) has a top side provided within the lower cover (11, 21) at a position between the upper edge of the ventilation hole (112, 212) and the first coupling opening (113, 213), and the separating unit (12) is formed with at least one convection pathway (121) which can communicate with the top side of the separating unit (12) and the ventilation hole (112, 212), respectively;
a heat sink (13, 23) made of a thermally conductive material having a thermal conductivity coefficient higher than that of the non-thermally conductive or insulating material, wherein the bottom end of the heat sink (13, 23) is positioned on the top side of the separating unit (12) such that the heat sink (13, 23) can communicate with the ventilation hole (112, 212) through the convection pathway (121), at least one LED circuit board (131, 231) is attached to the outer side of the heat sink (13, 23), and the LED circuit board (131, 231) is electrically connected to the driving circuit board (111, 211) so as to drive at least one LED (1311, 2311) on the LED circuit board (131, 231) to emit light; and
an upper cover (14, 24) made of a light permeable material, wherein the top side of the upper cover (14, 24) is formed with at least one convection hole (141, 241), the top end of the heat sink (13, 23) is positioned in the upper cover (14, 24) and corresponds in position to the convection hole (141, 241) such that the heat sink (13, 23) can communicate with the cold ambient air outside the bulb through the convection hole (141, 241), the upper cover (14, 24) is formed with a second coupling opening (143, 243) at the bottom side thereof, the second coupling opening (143, 243) can be coupled with the first coupling opening (113, 213) such that the upper cover (14, 24) and the lower cover (11, 21) are assembled together to form a receiving space (S) therebetween for accommodating the heat sink (13, 23), and the receiving space (S) can communicate with the cold ambient air outside the bulb through a central axis bidirectional convection heat dissipation pathway formed by the ventilation hole (112, 212), the convection pathway (121), the heat sink (13, 23) and the convection hole (141, 241).

### Claim 2 (depends on 1)

The LED bulb of claim 1, wherein the separating unit (12) includes:
a base plate (122) provided within the lower cover (11) at a position between the lower edge of the ventilation hole (112) and the driving circuit board (111) for confining the driving circuit board (111) within the lower cover (11) at a position near the bottom side of the lower cover (11); and
a plurality of ventilation ribs (123) each having a bottom end fixed to the top side of the base plate (122) and a top end extending to a position within the lower cover (11) between the upper edge of the ventilation hole (112) and the first coupling opening (113), wherein the ventilation ribs (123) are configured to form the convection pathway (121) for allowing the ventilation hole (112) to communicate with the top side of the separating unit (12) through the convection pathway (121).

### Claim 3 (depends on 1)

The LED bulb of claim 1, the separating unit (12) includes:
a first separating plate (222) provided within the lower cover (21) at a position between the lower edge of the ventilation hole (212) and the driving circuit board (211), so as to confine the driving circuit board (211) within the lower cover (21) at a position near the bottom side of the lower cover (21); and
a second separating plate (223) provided within the lower cover (21) at a position between the upper edge of the ventilation hole (212) and the first coupling opening (213), so as to form a ventilation space (P) between the second separating plate (223) and the first separating plate (222), wherein the second separating plate (223) is formed with at least one penetrating hole (2231) thereon, thereby allowing the ventilation space (P) to communicate with the penetrating hole (2231) for forming the convection pathway (121).

### Claim 4 (depends on 2)

The LED bulb of claim 2, wherein the heat sink (13, 23) is axially provided with and penetrated by a central axis hole (132, 232), the central axis hole (132, 232) is in communication with the convection pathway (121) and the convection hole (141, 241), respectively, so as to form the central axis bidirectional convection heat dissipation pathway sequentially through the ventilation hole (112, 212), the convection pathway (121), the central axis hole (132, 232) and the convection hole (141, 241).

### Claim 5 (depends on 3)

The LED bulb of claim 3, wherein the heat sink (13, 23) is axially provided with and penetrated by a central axis hole (132, 232), the central axis hole (132, 232) is in communication with the convection pathway (121) and the convection hole (141, 241), respectively, so as to form the central axis bidirectional convection heat dissipation pathway sequentially through the ventilation hole (112, 212), the convection pathway (121), the central axis hole (132, 232) and the convection hole (141, 241).

### Claim 6 (depends on 4)

The LED bulb of claim 4, wherein the inner wall surface of the central axis hole (132, 232) is provided with a plurality of heat dissipating fins (133, 233) extending axially or radially along the central axis hole (132, 232).

### Claim 7 (depends on 5)

The LED bulb of claim 5, wherein the inner wall surface of the central axis hole (132, 232) is provided with a plurality of heat dissipating fins (133, 233) extending axially or radially along the central axis hole (132, 232).

### Claim 8 (depends on 6)

The LED bulb of claim 6, wherein the upper cover (14, 24) further includes at least one positioning rib (145, 245) formed at a position adjacent to the convection hole (141, 241) and extending toward the receiving space (S), wherein an end of the positioning rib (145, 245) away from the upper cover (14, 24) is in contact against the top end of the heat sink (13, 23).

### Claim 9 (depends on 7)

The LED bulb of claim 7, wherein the upper cover (14, 24) further includes at least one positioning rib (145, 245) formed at a position adjacent to the convection hole (141, 241) and extending toward the receiving space (S), wherein an end of the positioning rib (145, 245) away from the upper cover (14, 24) is in contact against the top end of the heat sink (13, 23).

### Claim 10 (depends on 8)

The LED bulb of claim 8, wherein the first separating plate (222) can be made of a non-thermally conductive or insulating material, and the second separating plate (223) can be made of a thermally conductive.

### Claim 11 (depends on 9)

The LED bulb of claim 9, wherein the first separating plate (222) can be made of a non-thermally conductive or insulating material, and the second separating plate (223) can be made of a thermally conductive.

### Claim 12 (depends on 10)

The LED bulb of claim 10, wherein the lower cover (11, 21) further includes at least one heat dissipating hole (115, 215) formed at a position corresponding to the driving circuit board (111, 211).

### Claim 13 (depends on 11)

The LED bulb of claim 11, wherein the lower cover (11, 21) further includes at least one heat dissipating hole (115, 215) formed at a position corresponding to the driving circuit board (111, 211).