WO2013074747A1 - Retention mechanism for led light bulb internal heatsink - Google Patents

Retention mechanism for led light bulb internal heatsink Download PDF

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Publication number
WO2013074747A1
WO2013074747A1 PCT/US2012/065215 US2012065215W WO2013074747A1 WO 2013074747 A1 WO2013074747 A1 WO 2013074747A1 US 2012065215 W US2012065215 W US 2012065215W WO 2013074747 A1 WO2013074747 A1 WO 2013074747A1
Authority
WO
WIPO (PCT)
Prior art keywords
shell
heatsink
light bulb
protrusion
led light
Prior art date
Application number
PCT/US2012/065215
Other languages
French (fr)
Inventor
Ronald J. Lenk
Carol Lenk
Original Assignee
Reliabulb, Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Reliabulb, Llc filed Critical Reliabulb, Llc
Publication of WO2013074747A1 publication Critical patent/WO2013074747A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • 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
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/23—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
    • F21K9/232—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 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/005—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages with keying means, i.e. for enabling the assembling of component parts in distinctive positions, e.g. for preventing wrong mounting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • 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
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a retention mechanism for a heatsink internal to a light-emitting diode (LED) light bulb.
  • LED light-emitting diode
  • LED light bulbs typically require some sort of heatsink to remove the waste heat generated by the LEDs they use.
  • these heatsinks need to be inside the light bulb's shell.
  • the shell forms a tapering cylinder in its lower part.
  • the heatsink will tend to move up (away from the base).
  • the heatsink material which is typically a metal, may have a smaller coefficient of thermal expansion than the shell material, which is typically glass or a plastic.
  • the shell material may move away from the heatsink material, allowing the heatsink to move down (towards the base).
  • the present disclosure is directed to an LED light bulb, with an interior heatsink that is held in place by a protrusion or protrusions on the inside of the shell of the light bulb.
  • the protrusion or protrusions protrude out from the inside of the shell far enough to catch the heatsink.
  • the protrusion or protrusions may be on top of the heatsink to prevent it from rising or below the heatsink to prevent it from falling.
  • protrusions exist both on top and below the heatsink to prevent it from either rising or falling. As the heatsink material typically expands less with temperature than does the shell material, the protrusions will continue to hold the heatsink in place during operation of the LED light bulb.
  • the protrusion or protrusions are made from the same material as the shell, and are molded in to the shell and thus created as part of the shell.
  • the protrusions are all parallel, rather than being radial, to permit easy mold release.
  • the protrusions may consist of two or more nubs, or may be complete annuli. In a preferred embodiment, four nubs are used, which allows easy assembly of two halves of the shell while requiring only a small amount of extra shell material.
  • FIG. 1 is a cross-sectional drawing of an LED light bulb showing the interior heatsink and the shell, showing that under compression the heatsink may tend to rise inside the shell, according to one or more embodiments shown or described herein.
  • FIG. 2 is a cross-sectional drawing of an LED light bulb showing the interior heatsink and the shell, showing that heating may cause the heatsink to fall inside the shell, according to one or more embodiments shown or described herein.
  • Fig. 3 is a cross-sectional drawing of an LED light bulb with an interior heatsink and a shell with retention nubs holding the heatsink in place, according to one or more embodiments shown or described herein.
  • Fig. 4 is a cross-sectional drawing of an LED light bulb with an interior heatsink and a shell with retention nubs holding the heatsink in place, showing that the nubs are symmetrically distributed around the shell, according to one or more embodiments shown or described herein. DESCRIPTION OF EMBODIMENTS
  • FIG. 1 is a cross-sectional drawing of an LED light bulb 100 showing the interior heatsink 110 and the shell 120, showing that under compression the heatsink 110 may tend to rise inside the shell 120.
  • compressive force 130 may be applied to the shell 120, for example during construction. Since this lessens the diameter 121 of the shell 120, the heatsink 110 is pushed up 140.
  • FIG. 2 is a cross-sectional drawing of an LED light bulb 100 showing the interior heatsink 110 and the shell 120, showing that heating may cause the heatsink 110 to fall inside the shell 120.
  • the shell 120 expands more than does the heatsink 110. Since this increases the diameter 121 of the shell 120, the heatsink 110 drops down 141.
  • FIG. 3 is a cross-sectional drawing of an LED light bulb 100 with an interior heatsink 110 and a shell 150 with retention nubs 152 and 153 holding the heatsink 110 in place.
  • the retention nubs 152 and 153 are molded into the shell 150.
  • Both sets of retention nubs 152 and 153 protrude out from the shell 150 in to the inside of the LED light bulb 100 and overlap the heatsink 110.
  • the retention nubs 152 prevent the heatsink 110 from rising.
  • the retention nubs 153 prevent the heatsink 110 from falling.
  • the retention nubs 152 and 153 are sufficiently large to hold the heatsink in place during maximum thermal expansion of the shell 150.
  • Fig. 4 is a cross-sectional drawing of an LED light bulb 100 with an interior heatsink 110 and a shell 150 with retention nubs 160 holding the heatsink 110 in place, showing that the nubs 160 are symmetrically distributed around the shell 150.
  • the set of retention nubs 160 consists of four nubs symmetrically disposed around the axis of the LED light bulb 100.
  • the retention nubs 160 are all parallel, not radial, in order to permit easy mold release.

Abstract

The present disclosure is directed to an LED light bulb, with an interior heatsink that is held in place by a protrusion or protrusions on the inside of the shell of the light bulb. The protrusion or protrusions protrude out from the inside of the shell far enough to catch the heatsink. The protrusion or protrusions may be on top of the heatsink to prevent it from rising or below the heatsink to prevent it from falling. The protrusions exist both on top and below the heatsink to prevent it from either rising or falling. As the heatsink material typically expands less with temperature than does the shell material, the protrusions will continue to hold the heatsink in place during operation of the LED light bulb.

Description

RETENTION MECHANISM FOR LED LIGHT BULB INTERNAL HEATSINK
TECHNICAL FIELD
The present invention relates to a retention mechanism for a heatsink internal to a light-emitting diode (LED) light bulb.
BACKGROUND ART
LED light bulbs typically require some sort of heatsink to remove the waste heat generated by the LEDs they use. In order to conform to the traditional incandescent light bulb shape, these heatsinks need to be inside the light bulb's shell. The shell forms a tapering cylinder in its lower part. However, this presents a challenge for the design of the heatsink. It must be situated in the correct location relative to the shell in order to ensure the proper thermal conductivity from the heatsink to the shell, and must remain there when the shell undergoes compression or temperature change.
During compression of the shell, such as during assembly, the heatsink will tend to move up (away from the base). Similarly, when the LED light bulb is on the heatsink and shell heat up. However, the heatsink material, which is typically a metal, may have a smaller coefficient of thermal expansion than the shell material, which is typically glass or a plastic. Thus, during operation, the shell material may move away from the heatsink material, allowing the heatsink to move down (towards the base).
It would be desirable to be able to ensure the location of the heatsink relative to the shell of the LED light bulb despite compression of the shell or differential thermal expansion of the shell relative to the heatsink. SUMMARY OF INVENTION
The present disclosure is directed to an LED light bulb, with an interior heatsink that is held in place by a protrusion or protrusions on the inside of the shell of the light bulb. The protrusion or protrusions protrude out from the inside of the shell far enough to catch the heatsink. The protrusion or protrusions may be on top of the heatsink to prevent it from rising or below the heatsink to prevent it from falling. In a preferred embodiment protrusions exist both on top and below the heatsink to prevent it from either rising or falling. As the heatsink material typically expands less with temperature than does the shell material, the protrusions will continue to hold the heatsink in place during operation of the LED light bulb.
In one embodiment, the protrusion or protrusions are made from the same material as the shell, and are molded in to the shell and thus created as part of the shell. In a preferred embodiment, the protrusions are all parallel, rather than being radial, to permit easy mold release. The protrusions may consist of two or more nubs, or may be complete annuli. In a preferred embodiment, four nubs are used, which allows easy assembly of two halves of the shell while requiring only a small amount of extra shell material.
BRIEF DESCRIPTION OF DRAWINGS
The accompanying drawings are included to provide a further understanding of the present disclosure, and is incorporated in and constitute a part of this specification. The drawings illustrate one or more embodiments of the present disclosure and, together with the detailed description, serve to explain the principles of the present disclosure.
FIG. 1 is a cross-sectional drawing of an LED light bulb showing the interior heatsink and the shell, showing that under compression the heatsink may tend to rise inside the shell, according to one or more embodiments shown or described herein.
FIG. 2 is a cross-sectional drawing of an LED light bulb showing the interior heatsink and the shell, showing that heating may cause the heatsink to fall inside the shell, according to one or more embodiments shown or described herein.
Fig. 3 is a cross-sectional drawing of an LED light bulb with an interior heatsink and a shell with retention nubs holding the heatsink in place, according to one or more embodiments shown or described herein.
Fig. 4 is a cross-sectional drawing of an LED light bulb with an interior heatsink and a shell with retention nubs holding the heatsink in place, showing that the nubs are symmetrically distributed around the shell, according to one or more embodiments shown or described herein. DESCRIPTION OF EMBODIMENTS
Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
According to the design characteristics, a detailed description of the preferred embodiment is given below.
FIG. 1 is a cross-sectional drawing of an LED light bulb 100 showing the interior heatsink 110 and the shell 120, showing that under compression the heatsink 110 may tend to rise inside the shell 120. As shown in FIG. 1, compressive force 130 may be applied to the shell 120, for example during construction. Since this lessens the diameter 121 of the shell 120, the heatsink 110 is pushed up 140.
FIG. 2 is a cross-sectional drawing of an LED light bulb 100 showing the interior heatsink 110 and the shell 120, showing that heating may cause the heatsink 110 to fall inside the shell 120. As shown in FIG. 2, when the temperature of the heatsink 110 and the shell 120 rises, for example due to operation of the bulb, the shell 120 expands more than does the heatsink 110. Since this increases the diameter 121 of the shell 120, the heatsink 110 drops down 141.
FIG. 3 is a cross-sectional drawing of an LED light bulb 100 with an interior heatsink 110 and a shell 150 with retention nubs 152 and 153 holding the heatsink 110 in place. As shown in FIG. 3, the retention nubs 152 and 153 are molded into the shell 150. There are retention nubs 152 above the level of the top of the heatsink 110, and also further retention nubs 153 below the level of the bottom of the heatsink 110. Both sets of retention nubs 152 and 153 protrude out from the shell 150 in to the inside of the LED light bulb 100 and overlap the heatsink 110. During compression of the shell 150, the retention nubs 152 prevent the heatsink 110 from rising. During heating and differential expansion of the shell 150 and the heatsink 110, the retention nubs 153 prevent the heatsink 110 from falling. The retention nubs 152 and 153 are sufficiently large to hold the heatsink in place during maximum thermal expansion of the shell 150.
Fig. 4 is a cross-sectional drawing of an LED light bulb 100 with an interior heatsink 110 and a shell 150 with retention nubs 160 holding the heatsink 110 in place, showing that the nubs 160 are symmetrically distributed around the shell 150. As shown in FIG. 4, the set of retention nubs 160 consists of four nubs symmetrically disposed around the axis of the LED light bulb 100. The retention nubs 160 are all parallel, not radial, in order to permit easy mold release.
It will be apparent to those skilled in the art that various modifications and variation can be made to the structure of the present disclosure without departing from the scope or spirit of the embodiments disclosed herein. In view of the foregoing, it is intended that the present disclosure cover modifications and variations of the embodiments provided they fall within the scope of the following claims and their equivalents.

Claims

-5- CLAIMS
1. A retention mechanism for an internal heatsink for an LED light bulb with a shell, comprising:
at least one protrusion from said shell; and
wherein said at least one protrusion prevents said heatsink from rising in said shell.
2. A retention mechanism for an internal heatsink for an LED light bulb with a shell as set forth in Claim 1, wherein said at least one protrusion is part of said shell.
3. A retention mechanism for an internal heatsink for an LED light bulb with a shell as set forth in Claim 1, wherein said at least one protrusion is at least two separate pieces symmetrically distributed around the axis of said LED light bulb.
4. A retention mechanism for an internal heatsink for an LED light bulb with a shell and at least two separate pieces comprising the protrusion as set forth in Claim 3, wherein said at least two separate pieces are parallel with one another.
5. A retention mechanism for an internal heatsink for an LED light bulb with a shell, comprising:
at least one protrusion from said shell; and
wherein said at least one protrusion prevents said heatsink from falling in said shell.
6. A retention mechanism for an internal heatsink for an LED light bulb with a shell as set forth in Claim 5, wherein said at least one protrusion is part of said shell.
7. A retention mechanism for an internal heatsink for an LED light bulb with a shell as set forth in Claim 5, wherein said at least one protrusion is at least two separate pieces symmetrically distributed around the axis of said LED light bulb. -6-
8. A retention mechanism for an internal heatsink for an LED light bulb with a shell and at least two separate pieces comprising the protrusion as set forth in Claim 7, wherein said at least two separate pieces are parallel with one another.
9. A retention mechanism for an internal heatsink for an LED light bulb with a shell, comprising:
at least one first protrusion from said shell;
at least one second protrusion from said shell;
wherein said at least one first protrusion prevents said heatsink from rising in said shell; and
wherein said at least one second protrusion prevents said heatsink from falling in said shell.
10. A retention mechanism for an internal heatsink for an LED light bulb with a shell as set forth in Claim 9, wherein said at least one first protrusion and said at least one second protrusion are parts of said shell.
11. A retention mechanism for an internal heatsink for an LED light bulb with a shell as set forth in Claim 9, wherein said at least one first protrusion and at least one second protrusion are each at least two separate pieces symmetrically distributed around the axis of said LED light bulb.
12. A retention mechanism for an internal heatsink for an LED light bulb with a shell and at least one first protrusion and at least one second protrusion each of which is at least two separate pieces as set forth in Claim 11, wherein said at least two separate pieces of said first protrusion are parallel with one another, and wherein said at least two separate pieces of said second protrusion are parallel with one another. -7-
13. A retention mechanism for an internal heatsink for an LED light bulb with a shell and at least one first protrusion and at least one second protrusion each of which is at least two separate pieces as set forth in Claim 11, wherein said at least two separate pieces of said first protrusion and said at least two separate pieces of said second protrusion are parallel with one another.
PCT/US2012/065215 2011-11-18 2012-11-15 Retention mechanism for led light bulb internal heatsink WO2013074747A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201161561378P 2011-11-18 2011-11-18
US61/561,378 2011-11-18

Publications (1)

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WO2013074747A1 true WO2013074747A1 (en) 2013-05-23

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5504666A (en) * 1994-07-29 1996-04-02 475231 B.C. Ltd. Light bulb cooling jacket and heat dissipation system
WO2003025458A1 (en) * 2001-09-17 2003-03-27 Gelcore Llc Variable optics spot module
US20090310349A1 (en) * 2008-06-13 2009-12-17 Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. Led lamp
US20100259934A1 (en) * 2009-04-13 2010-10-14 Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. Led illumination device
US20110089830A1 (en) * 2009-10-20 2011-04-21 Cree Led Lighting Solutions, Inc. Heat sinks and lamp incorporating same
US20110149577A1 (en) * 2008-08-21 2011-06-23 Satoshi Shida Light source for lighting

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5504666A (en) * 1994-07-29 1996-04-02 475231 B.C. Ltd. Light bulb cooling jacket and heat dissipation system
WO2003025458A1 (en) * 2001-09-17 2003-03-27 Gelcore Llc Variable optics spot module
US20090310349A1 (en) * 2008-06-13 2009-12-17 Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. Led lamp
US20110149577A1 (en) * 2008-08-21 2011-06-23 Satoshi Shida Light source for lighting
US20100259934A1 (en) * 2009-04-13 2010-10-14 Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. Led illumination device
US20110089830A1 (en) * 2009-10-20 2011-04-21 Cree Led Lighting Solutions, Inc. Heat sinks and lamp incorporating same

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