KR20150063631A - Bulb type led lamp having heat radiating member - Google Patents

Abstract

A bulk type LED lamp according to one aspect of the present invention includes a light emitting module which mounts an LED device, a first heat radiation member which surrounds the light emitting module and includes a plurality of heat radiation fins on the outer circumference thereof, and a light diffusion cover which faces the light emitting module and is made of light transmitting materials. The first heat radiation member includes a cylindrical core and an extension part which protrudes from one end of the core to the outside. The first heat radiation member includes a plurality of first heat radiation fins which protrude from the outer circumference of the core and a second heat radiation fin which protrudes from the extension part in the longitudinal direction of the first heat radiation member.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bulb-type LED lamp having a heat-

The present invention relates to a bulb-type LED lamp having a heat dissipating member, and more particularly to a bulb-type LED lamp having improved heat dissipation characteristics.

BACKGROUND ART [0002] In recent years, LED devices have been spotlighted as light sources for various lighting devices. The LED element has advantages such as less heat generation, less power consumption, longer lifetime, and impact resistance than a conventional illumination light source. In addition, since mercury or a discharge gas is not used in the manufacturing process like a fluorescent lamp, there is an advantage that it does not cause environmental pollution.

If the LED device provides adequate power supply and heat dissipation means, it can maintain the lighting state without burning even if used for over 100,000 hours. All light sources decrease in light output as time passes. Since 80% of the initial brightness is not felt well by people, the life expectancy of LED devices is expected to be about 40,000 to 50,000 hours.

Therefore, compared with 1,500 hours of incandescent lamps and 10,000 hours of fluorescent lamps, LED devices have a long lifetime and can be said to be light sources.

However, if the existing fluorescent socket is discarded in order to use the LED lamp, not only the resources are wasted but also the expensive socket is required to use the LED lamp. Accordingly, an LED lamp to replace a conventional bulb type lamp has been developed.

However, in order to realize a bulb type lamp using an LED device, it is necessary to efficiently discharge heat generated from the LED lamp. In addition, the light emitted from the LED device can not be spread widely, but may be straightened to cause glare. In the case of the bulb type LED lamp, it is necessary to induce the downstream light.

[Related Technical Literature]

1. Bulb type LED lamp (Korean Patent Laid-Open No. 10-2010-0127447)

2. Bulb type LED lamp (Korea Patent Publication No. 10-2013-0031968)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bulb-type LED lamp with improved heat dissipation efficiency.

Another object of the present invention is to provide a bulb-type LED lamp with improved afterglow.

A bulb-type LED lamp according to one aspect of the present invention includes a light emitting module having an LED element mounted thereon, a first heat dissipating member surrounding the light emitting module and having a plurality of heat dissipating fins formed on the outer circumference thereof, Wherein the first radiation member includes the cylindrical core and an extension protruding outward at one side end of the core, wherein the first radiation member has a plurality of projections And a second radiating fin protruding in the longitudinal direction of the first radiating member at the extension portion.

Here, the first radiating fins and the second radiating fins may be arranged in parallel.

The first heat dissipating member is coupled to a second heat dissipating member made of a material different from the first heat dissipating member. The second heat dissipating member has a rim portion and a connection protrusion formed in the rim portion, .

The rim may be formed with a plurality of heat dissipating protrusions which are in contact with the radiating fins formed in the first heat dissipating member.

Further, the radiating fins may be provided with a stepped portion into which the rim portion is inserted.

The connection protrusion may be inserted into a support groove formed in an outer periphery of the first heat dissipation member and a first support protrusion may be formed at a lower end of the connection protrusion so as to be caught by a longitudinal end portion of the first heat dissipation member.

In addition, a recessed portion may be formed at the upper end of the rim portion and a fixing protrusion inserted into the incision portion may be formed in the first heat radiation member.

In addition, a seating hole is formed in the first heat dissipating member, a power control unit electrically connected to the light emitting module is inserted into the seating hole, and a stepped groove into which the light emitting module is inserted is formed at the longitudinal direction end of the seating hole .

The power control unit may be formed in a bar shape. A flange protruding from one end of the first heat dissipating member in the longitudinal direction of the first heat dissipating member may protrude from the power control unit, and a plurality of heat dissipating protrusions may be formed on the flange. .

The flange may have a second support protrusion protruding toward the second heat dissipating member. The second support protrusion may be inserted into an engagement groove formed in the first support protrusion. The first support protrusion may protrude from the flange And may be supported between the lower ends of the first heat radiation member.

The light diffusion cover may have an opening connected to the first radiation member at a lower end thereof. The light diffusion cover may include a first portion disposed adjacent to the opening, the first portion having a cross- And a second portion having a reduced cross-sectional area toward the tip, wherein the first portion has a height three to five times the height of the second portion.

In addition, the second portion may be formed to have a greater light scattering property than the first portion, and the second portion may be made to have a larger surface reflectance than the first portion.

In the LED lamp of the present invention, since the first radiating fins and the second radiating fins are formed in the first radiating member, heat can be emitted more efficiently. Further, since the first heat radiation member and the second heat radiation member, which are made of different materials, are provided, the heat radiation efficiency is improved.

Further, since the height of the first portion in the light diffusion cover is formed to be larger than the height of the first portion, the afterglow effect is improved.

1 is a perspective view illustrating a bulb-type LED lamp according to an embodiment of the present invention.
2 is an exploded perspective view illustrating a bulb-type LED lamp according to an embodiment of the present invention.
3 is a cross-sectional view illustrating a bulb-type LED lamp according to an embodiment of the present invention.
4 is a perspective view illustrating a light diffusion cover according to an embodiment of the present invention.
5 is a perspective view illustrating a first heat dissipating member according to an embodiment of the present invention.
6 is a longitudinal sectional view showing a first heat dissipating member according to an embodiment of the present invention.
7 is a perspective view illustrating a second heat dissipating member according to an embodiment of the present invention.
8 is a longitudinal sectional view illustrating a state where the first heat dissipation unit, the second heat dissipation member, and the power supply control unit are combined according to an embodiment of the present invention.

The present invention can be variously modified and may have various embodiments, and specific embodiments will be described in detail with reference to the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, the present invention and its preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view illustrating a bulb-type LED lamp according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view illustrating a bulb-type LED lamp according to an embodiment of the present invention.

1 and 2, a bulb-type LED lamp 100 according to the present embodiment includes a light emitting module 60, a light diffusion cover 10, a first heat radiation member 30, a second heat radiation member 20, a power supply control unit 40, and a terminal unit 50.

The light emitting module 60 has a cylindrical shape, and a plurality of LED elements are mounted on the upper surface of the light emitting module 60. The LED elements may be arranged on the light emitting module 60 in various forms.

4 is a perspective view illustrating a light diffusion cover according to an embodiment of the present invention.

Referring to FIG. 4, the light diffusion cover 10 is made of a material having optical transparency and an opening 12 is formed at a lower end thereof to be connected to the first radiation member 30. The light diffusion cover 10 is connected to the first portion 10a and the first portion 10a which are disposed adjacent to the opening 12 and whose sectional area increases toward the front end 13, And a second portion 10b that decreases.

Here, the front end 13 of the light diffusion cover 10 means an end clogged by the opposite end of the end where the opening 12 is formed. The first portion 10a is disposed adjacent to the aperture 12 and the second portion 10b is disposed adjacent the tip 13. [

The first portion 10a has a height three to five times the height of the second portion 10b. The second portion 10b also has greater light scattering than the first portion 10a. Fine protrusions for light scattering may be formed in the second portion 10b, or light scattering particles may be applied. The light scattering particles may be any material selected from the group consisting of calcium carbonate, calcium phosphate, barium sulfate, silica, titanium oxide, and glass beads as light scattering particles.

The second portion 10b may be coated with a reflective material so that the surface reflectance of the second portion 10b may be greater than the surface reflectance of the first portion 10a. However, the reflective material should be applied at a low density and thickness so that the amount of light emitted through the second portion is not significantly reduced.

As described above, when the second portion 10b has a high light scattering property and a high surface reflectance, the light emitted from the light emitting module 60 is scattered and reflected by the second portion 10b and diffused into the first portion 10a do. Also, since the height of the first portion 10a is greater than the height of the second portion 10b, the amount of light emitted through the first portion 10a is increased to improve the afterglow characteristics.

FIG. 5 is a perspective view illustrating a first heat dissipating member according to an embodiment of the present invention, and FIG. 6 is a longitudinal sectional view illustrating a first heat dissipating member according to an embodiment of the present invention.

3, 5, and 6, the first heat radiation member 30 has a cylindrical shape and includes a core 33 disposed at the center and an extension portion 34 projecting outward from the upper end of the core ). The first heat-radiating member 30 is formed to have a circular cross-section and may be made of metal such as aluminum or copper.

A seating hole 32 is formed inside the first radiating member 30 and a power control unit 40 is inserted into the seating hole 32. In addition, a stepped groove 31 into which the light emitting module 60 is inserted is formed at an end located on the upper side in the longitudinal direction of the seating hole 32. Accordingly, the first radiation member 30 is installed to surround the light emitting module 60 and the power control unit 40.

The power supply control unit 40 and the light emitting module 60 are inserted into the first heat dissipating member 30 and the first heat dissipating member 30 surrounds the power control unit 40 and the light emitting module 60 The contact area between the light emitting module 60 and the power supply control unit 40 and the first heat radiation member 30 is increased to improve the heat radiation efficiency.

Further, a thermally conductive adhesive or a thermally conductive tape may be interposed between the light emitting module 60 and the first heat dissipating member. The thermally conductive adhesive is an adhesive containing thermally conductive particles made of metal or the like. When the thermally conductive adhesive or the thermally conductive tape is interposed, the light emitting module 60 can be stably fixed and the heat generated in the light emitting module 60 can be discharged more quickly.

The first radiating member 30 includes a plurality of first radiating fins 35 protruding from the outer periphery of the core 33 and a second radiating fin 36 protruding in the longitudinal direction of the first radiating member 30 from the extending portion 34 ). The first radiating fins 35 are arranged parallel to each other, and the first radiating fins 35 and the second radiating fins 36 are also arranged in parallel. The first radiating fins 35 are fixed to the core 33 along the longitudinal direction of the first radiating member 30 but the second radiating fins 36 are only fixed to the upper portion 34 of the second radiating fin 36, And the extension portion 34 to be a free-end structure.

The second radiating fins 36 are disposed outside the first radiating fins 35 and the first radiating fins 35 are disposed between the second radiating fins 36 disposed at both sides.

When the radiating fins are radially arranged, the radiating fins can be arranged at uniform intervals on the outer circumferential surface of the cylinder. However, the space between the outer ends of the radiating fins is wide, but the space between the inner ends supported by the radiating fins is very narrow. Accordingly, although the flow of air may be active on the outside of the heat-generating fins, the flow velocity of the air inside the heat-dissipating fins is low, thereby lowering the heat dissipation efficiency.

However, if the radiating fins are arranged in parallel, it is difficult to protrude the radiating fins from both sides of the cylinder, so that there is a problem that the heat radiation efficiency of both side ends is lowered. However, according to the present embodiment, the second radiating fins 36 are formed on both sides of the second radiating member 20 to radiate heat, and the second radiating fins 36 are spaced apart from the core 33 and contact with the air, Is larger than the first radiating fin (35). Both side ends of the second heat-radiating member 20 can be sufficiently cooled by the second radiating fins.

The heat dissipation fins 35 and 36 are formed with a stepped portion 37 recessed inwardly so that the rim portion 22 constituting the second heat radiation member 20 can be inserted. A support groove 36a is formed on the outer circumference of the first radiation member 30 so as to be inserted into the connection protrusion 21 of the second radiation member 20. The support groove 36a is formed on the outer circumference of the first radiation member 30, Radiating fins 36 disposed on the outermost side. The second radiating fins 36 are formed with guide projections 36b which abut against side ends of the connecting protrusions 21 and fixing protrusions 36c which are inserted into the cutouts 24 formed in the second radiating member 20 .

7 is a perspective view illustrating a second heat dissipating member according to an embodiment of the present invention.

7, the second heat dissipating member 20 is coupled to the first heat dissipating member 30 and has a rim 22 and a connecting protrusion 21 protruding from the rim 22. The rim portion 22 is formed in a circular shape and is coupled to the upper end of the first heat radiation member 30 and the connection protrusion 21 is formed along the longitudinal direction of the first heat radiation member 30, Respectively. The rim portion 22 is inserted into the stepped portion 37 and the connecting projection 21 is inserted into the support groove 36a.

The rim portion 22 is formed with a plurality of heat dissipating protrusions 23 protruding from the outer circumferential surface. The lower ends of the heat dissipating protrusions 23 are in contact with the heat dissipating fins 35, 36. As a result, the heat dissipating protrusions 23 and the heat dissipation fins 35 and 36 are connected in series.

A first support protrusion 26 is formed at the lower end of the connection protrusion 21 and is engaged with a longitudinal end of the first radiation member 30. The first support protrusion 26 is formed on the outer surface of the first support protrusion 26, An engaging groove 27 into which the second supporting step 41a of the flange 41 is inserted is formed. The first support step 26 is supported between the flange 41 and the lower end of the first radiation member 30.

A cutout portion 24 is formed at the upper end of the rim portion 22 so that the cutout portion 24 is inserted with a fixing protrusion 36c formed on the first heat radiation member 30. The fixing protrusion 36c and the cutout portion 24 are engaged with each other so that the second radiation member 20 can be stably supported on the first radiation member 30. [ The upper end of the second heat dissipating member 20 is fixed to the fixing protrusion 36c and the lower end of the second heat dissipating member 20 is fixed by the first supporting step 26 so that the second heat dissipating member 20 is fixed to the first heat dissipating member 30 And can be stably fixed.

The second heat-radiating member 20 is made of a material different from that of the first heat-radiating member 30. The second heat-radiating member 20 may be made of thermally conductive plastic or metal. The thermally conductive plastic may be plastics to which the thermally conductive filler is added, and the thermally conductive filler may be composed of silicon oxide, aluminum oxide, boron nitride, aluminum nitride, or the like. On the other hand, the first radiation member 30 and the second radiation member 20 may be bonded by a thermally conductive adhesive or a thermally conductive tape.

As shown in FIG. 2, the power supply controller 40 controls the current and voltage supplied to the light emitting module 60 and has a rod shape. Inside the power control unit 40, a SPMS (Switching Mode Power Supply) board in which circuit elements for controlling voltage and current are mounted is installed. A flange 41 is formed on the outer circumferential surface of the power control unit 40 so as to abut the lower end of the first heat radiation member 30 in the longitudinal direction. The flange 41 is formed along the circumferential direction of the power supply control unit 40. The flange 41 is formed with a plurality of heat dissipating protrusions 42 which are in contact with the first radiating fin 35 to be continued. The upper end of the heat dissipating protrusion 42 is in contact with the first heat dissipating fin 35 so that the heat dissipating protrusion 42 and the first heat dissipating fin 35 are connected in a line.

When the heat dissipation protrusion 42 is formed as described above, the contact area between the power supply control unit 40 and the first heat dissipation member 30 is expanded and the heat transfer distance is shortened. Therefore, (35). ≪ / RTI >

9, the flange 41 is formed with a second support step 41a protruding upward. The second support step 41a is formed in the coupling groove 27 formed in the second heat dissipating member 20, . The first supporting step 26 of the second radiating member 20 is inserted between the flange 41 and the lower end of the first radiating member 30 and the flange 41 of the second radiating member 20 So that the lower end is prevented from being detached from the first heat radiation member (30).

The terminal unit 50 is electrically connected to the power supply control unit 40 and supplies current to the power supply control unit 40. A screw thread is formed on the outer periphery of the terminal portion 50, and the terminal portion 50 can be coupled to the socket.

As described above, preferred embodiments of the present invention have been disclosed in the present specification and drawings, and although specific terms have been used, they have been used only in a general sense to easily describe the technical contents of the present invention and to facilitate understanding of the invention , And are not intended to limit the scope of the present invention. It is to be understood by those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

100: LED lamp
10: Light diffusion cover
10a: first part
10b: second part
12: aperture
13: Fleet
20: second heat-
21: connection projection
22: limb
23: heat radiating projection
24: incision
26: first support jaw
27: Coupling groove
30:
31: stepped groove
32: Seated hole
33: Core
34:
35: a first radiating fin
36: second radiating fin
36a: Support groove
36b: guide projection
36c: Fixing projection
37: stepped portion
40:
41: Flange
41a: a second supporting chin
42: heat radiating projection
50: terminal portion
60: Light emitting module

Claims (13)

A light emitting module in which an LED element is mounted;
A first heat dissipation member surrounding the light emitting module and having a plurality of heat dissipation fins formed on an outer periphery thereof; And
And a light diffusion cover which is opposed to the light emitting module and is made of a material having light transmittance,
Wherein the first radiating member includes the cylindrical core and an extending portion protruding outward at one side end of the core, the first radiating member includes a plurality of first radiating fins protruding from an outer periphery of the core, And a second radiating fin protruding in the longitudinal direction of the first radiating member.
The method according to claim 1,
Wherein the first radiating fins and the second radiating fins are disposed in parallel to each other.
The method according to claim 1,
The first radiating member is coupled to a second radiating member made of a material different from the first radiating member, and the second radiating member has a rim portion and a coupling protrusion formed in the rim portion so as to extend in the longitudinal direction of the first radiating member And a bulb-type LED lamp.
The method of claim 3,
And a plurality of heat dissipating protrusions are formed on the rim portion so as to be in contact with the radiating fins formed on the first heat dissipating member.
5. The method of claim 4,
Wherein the radiating fins are formed with a stepped portion into which the rim is inserted.
6. The method of claim 5,
Wherein the connection protrusion is inserted into a support groove formed in an outer periphery of the first heat dissipation member and a first support protrusion is formed at a lower end of the connection protrusion so as to be caught by a longitudinal end portion of the first heat dissipation member. lamp.
5. The method of claim 4,
Wherein a bottomed recessed portion is formed at an upper end of the rim portion, and a fixing protrusion inserted into the cutout portion is formed in the first heat dissipating member.
5. The method of claim 4,
A power control part electrically connected to the light emitting module is inserted into the seating hole, and a stepped groove into which the light emitting module is inserted is formed at the longitudinal end of the seating hole. Bulb type LED lamp.
9. The method of claim 8,
A flange protruding from one end of the first heat dissipating member in the longitudinal direction of the first heat dissipating member is protruded and a plurality of heat dissipating protrusions connected to the heat dissipating fin are formed on the flange, Bulb type LED lamp.
10. The method of claim 9,
Wherein the flange is formed with a second support step protruding toward the second heat dissipating member, the second support step is inserted into an engagement groove formed in the first support step, Wherein the bulb-shaped LED lamp is supported by being sandwiched between the lower ends of the heat dissipating members.
The method according to claim 1,
The light diffusion cover has an opening connected to the first radiation member at a lower end thereof. The light diffusion cover is disposed adjacent to the opening and has a first portion extending in a cross-sectional area toward the front end and a first portion connected to the first portion, Wherein the first portion has a height that is three to five times as high as the height of the second portion.
12. The method of claim 11,
Wherein the second portion has greater light scattering properties than the first portion.
13. The method of claim 12,
Wherein the second portion has a greater surface reflectance than the first portion.

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