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US20060177193A1 - LED bulb - Google Patents

LED bulb Download PDF

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Publication number
US20060177193A1
US20060177193A1 US11/109,917 US10991705A US2006177193A1 US 20060177193 A1 US20060177193 A1 US 20060177193A1 US 10991705 A US10991705 A US 10991705A US 2006177193 A1 US2006177193 A1 US 2006177193A1
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US
United States
Prior art keywords
housing
circuit board
hollow core
light source
printed circuit
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
US11/109,917
Other versions
US7092612B1 (en
Inventor
Charles Coushaine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram Sylvania Inc
Original Assignee
Individual
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
Assigned to OSRAM SYLVANIA INC. reassignment OSRAM SYLVANIA INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: COUSHAINE, CHARLES M.
Priority to US11/109,917 priority Critical patent/US7092612B1/en
Application filed by Individual filed Critical Individual
Priority to CA 2529399 priority patent/CA2529399C/en
Priority to KR20060008799A priority patent/KR101238531B1/en
Priority to EP20060001742 priority patent/EP1691130B1/en
Priority to ES06001742T priority patent/ES2378183T3/en
Priority to JP2006031516A priority patent/JP4921803B2/en
Priority to CN2006100070758A priority patent/CN1818456B/en
Priority to US29/261,348 priority patent/USD619964S1/en
Publication of US20060177193A1 publication Critical patent/US20060177193A1/en
Publication of US7092612B1 publication Critical patent/US7092612B1/en
Application granted granted Critical
Priority to US29/339,895 priority patent/USD610545S1/en
Priority to US29/339,892 priority patent/USD610544S1/en
Priority to US29/339,891 priority patent/USD610543S1/en
Priority to US29/339,890 priority patent/USD610991S1/en
Assigned to OSRAM SYLVANIA INC. reassignment OSRAM SYLVANIA INC. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: OSRAM SYLVANIA INC.
Anticipated expiration legal-status Critical
Active legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
    • F16K5/0647—Spindles or actuating means
    • 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
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/61—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using light guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
    • F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/60—Handles
    • F16K31/602—Pivoting levers, e.g. single-sided
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/24—Light guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/237—Light guides characterised by the shape of the light guide rod-shaped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/249—Light guides with two or more light sources being coupled into the light guide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F21S43/31—Optical layout thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
    • F21S45/48—Passive cooling, e.g. using fins, thermal conductive elements or openings with means for conducting heat from the inside to the outside of the lighting devices, e.g. with fins on the outer surface of the lighting device
    • 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
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/77—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
    • F21V29/773—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0096—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the lights guides being of the hollow type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/30—Fog lights
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2103/00—Exterior vehicle lighting devices for signalling purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2103/00—Exterior vehicle lighting devices for signalling purposes
    • F21W2103/35—Brake lights
    • 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

  • This invention relates to light sources and more particularly to light sources employing light emitting diodes (LED or LEDs) and more particularly to light sources useful in the automotive field such as for headlights, taillights, stoplights, fog lights, turn signals, etc. Still more particularly, it relates to such light sources packaged to achieve industry accepted interchangeability at a lesser cost due to a reduction in the number of parts necessary.
  • LED light emitting diodes
  • LEDs have enormous life times, in the area of 100,000 hours, and are not as subject to vibration failures.
  • these LED sources have been hard-wired into their appropriate location, which increases the cost of installation. It would therefore be an advance in the art if an LED light source could be provided that had the ease of installation of the incandescent light sources. It would be a still further advance in the art if an LED light source could be provided that achieved an industry accepted interchangeable standard to replace the aforementioned incandescent bulb.
  • Such light sources have been developed and occasionally they have employed LEDs in combination with optical fibers or other light guides to concentrate the light of multiple LEDs or to spread the light in a desired fashion.
  • One such light source is described in co-pending patent application Ser. No. 10/899,546, filed Dec. 20, 2004, (Attorney's Docket No. 04-1-717) and assigned to the assignee of the present invention.
  • the latter light source uses a plurality of light guides, in a one-to-one relationship with a like plurality of LEDs. While the arrangement works well, it is expensive and requires a large number of parts, all of which require rather precise alignment.
  • an LED light source having a housing; a hollow core projecting from the housing, the hollow core being arrayed about a longitudinal axis; a printed circuit board closing the housing at one end of the hollow core and having a plurality of LEDs operatively fixed thereto about the center thereof; a light guide with a body having a given wall thickness positioned in the hollow core and having a first end in operative relationship with the plurality of LEDs and a second end projecting beyond the hollow core; and a first reflector attached to the second end of the light guide: and wherein the improvement comprises the housing being thermally conductive to form an extended and integral heat sink and the printed circuit board having a thermally conductive base that is in direct contact with the housing and provides the closure for the housing.
  • the number of parts is reduced and thus the cost of the light source is greatly enhanced.
  • FIG. 1 is a perspective view of a light source according to an embodiment of the invention.
  • FIG. 2 is a sectional, elevational view thereof.
  • FIG. 1 an LED light source 10 having a housing 12 with a hollow core 14 projecting therefrom.
  • the hollow core 14 is arrayed about a longitudinal axis 16 .
  • a circuit carrier 18 which can be a bent piece of aluminum 18 a having a flexible printed circuit board 18 b attached thereto, closes the open end 19 of the housing 12 at one end of the hollow core 14 and has a plurality of LEDs 20 operatively fixed thereto about the center thereof.
  • a light guide 22 with a body 24 having a given wall thickness T is positioned in the hollow core 14 and has a first end 25 in operative relationship with the plurality of LEDs and a second end 26 projecting beyond the hollow core 14 .
  • a first reflector 28 is attached to the second end 26 of the light guide 22 .
  • the housing 12 is thermally conductive to form an extended and integral heat sink and has an extended body-part 50 that preferably is provided with heat-radiating fins 52 .
  • a preferred material for the housing 12 is a thermally conductive plastic such as Cool Polymers E3603 thermally conductive polyamide.
  • the printed circuit board 18 has a thermally conducive base 30 that is in direct contact with the housing 12 via an upstanding V-shaped rim 32 .
  • the V-shaped rim is tensioned to provide a force-fit against the internal wall 19 a of the open end 19 of the housing 12 .
  • the printed circuit board is formed of flex-on aluminum.
  • Insertion of the printed circuit board 18 brings the circuitry on the board into press-on contact with the electrical lead-ins 54 (only one of which is shown) that are positioned in a connector 56 , for supplying power to the LEDs from an external supply, thus eliminating the need for welding.
  • Utilizing the printed circuit board 18 as the closure mechanism for the housing 12 further eliminates a separate closing member and an O-ring, in addition to the operations necessary for attaching an extra closing member, all ingredients of the prior art construction.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Planar Illumination Modules (AREA)

Abstract

An LED light source has a housing with a hollow projecting core. The core is arrayed about a longitudinal axis. A printed circuit board closes an open end of the housing at a core end and has LEDs operatively fixed about the center thereof. A light guide with a wall thickness T is positioned in the core and has a first end in operative relationship with the plurality of LEDs and a second end projecting beyond the hollow core. A first reflector is attached to the second end of the light guide. The housing is thermally conductive to form an extended and integral heat sink and has an extended body-part that preferably is provided with heat-radiating fins. A preferred material for the housing is thermally conductive plastic. The printed circuit board has a thermally conducive base that is in direct contact with the housing via an upstanding V-shaped rim.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • This application claims priority from Provisional Patent Application No. 60/651,820, filed, Feb. 10, 2005.
    • TECHNICAL FIELD
  • This invention relates to light sources and more particularly to light sources employing light emitting diodes (LED or LEDs) and more particularly to light sources useful in the automotive field such as for headlights, taillights, stoplights, fog lights, turn signals, etc. Still more particularly, it relates to such light sources packaged to achieve industry accepted interchangeability at a lesser cost due to a reduction in the number of parts necessary.
    • BACKGROUND ART
  • In the past, most automotive light sources have involved the use of incandescent bulbs. While working well and being inexpensive, these bulbs have a relatively short life and, of course, the thin filament employed was always subject to breakage due to vibration.
  • Recently some of the uses, particularly the stoplight, have been replaced by LEDs. These solid-state light sources have incredible life times, in the area of 100,000 hours, and are not as subject to vibration failures. However, these LED sources have been hard-wired into their appropriate location, which increases the cost of installation. It would therefore be an advance in the art if an LED light source could be provided that had the ease of installation of the incandescent light sources. It would be a still further advance in the art if an LED light source could be provided that achieved an industry accepted interchangeable standard to replace the aforementioned incandescent bulb.
  • Such light sources have been developed and occasionally they have employed LEDs in combination with optical fibers or other light guides to concentrate the light of multiple LEDs or to spread the light in a desired fashion. One such light source is described in co-pending patent application Ser. No. 10/899,546, filed Dec. 20, 2004, (Attorney's Docket No. 04-1-717) and assigned to the assignee of the present invention. The latter light source uses a plurality of light guides, in a one-to-one relationship with a like plurality of LEDs. While the arrangement works well, it is expensive and requires a large number of parts, all of which require rather precise alignment. Recently, as disclosed in co-pending patent application Ser. No. 11/058,304, filed Feb. 15, 2005 and assigned to the assignee of the present invention, a light source has been developed using LEDs together with a simplified form of light guide. It would be an advance in the art if the number of parts could be reduced even further without affecting the quality of the light source. Such parts reduction is critical to maintain competitive costs.
    • DISCLOSURE OF INVENTION
  • It is, therefore, an object of the invention to obviate the disadvantages of the prior art.
  • It is another object of the invention to enhance LED light sources.
  • It is yet another object of the invention to reduce the cost of LED light sources.
  • These objects are accomplished, in one aspect of the invention, by an LED light source having a housing; a hollow core projecting from the housing, the hollow core being arrayed about a longitudinal axis; a printed circuit board closing the housing at one end of the hollow core and having a plurality of LEDs operatively fixed thereto about the center thereof; a light guide with a body having a given wall thickness positioned in the hollow core and having a first end in operative relationship with the plurality of LEDs and a second end projecting beyond the hollow core; and a first reflector attached to the second end of the light guide: and wherein the improvement comprises the housing being thermally conductive to form an extended and integral heat sink and the printed circuit board having a thermally conductive base that is in direct contact with the housing and provides the closure for the housing.
  • The number of parts is reduced and thus the cost of the light source is greatly enhanced.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a perspective view of a light source according to an embodiment of the invention; and
  • FIG. 2 is a sectional, elevational view thereof.
    • BEST MODE FOR CARRYING OUT THE INVENTION
  • For a better understanding of the present invention, together with other and further objects, advantages and capabilities thereof, reference is made to the following disclosure and appended claims taken in conjunction with the above-described drawings.
  • Referring now to the drawings with greater particularity, there is shown in FIG. 1 an LED light source 10 having a housing 12 with a hollow core 14 projecting therefrom. The hollow core 14 is arrayed about a longitudinal axis 16. A circuit carrier 18, which can be a bent piece of aluminum 18 a having a flexible printed circuit board 18 b attached thereto, closes the open end 19 of the housing 12 at one end of the hollow core 14 and has a plurality of LEDs 20 operatively fixed thereto about the center thereof. A light guide 22 with a body 24 having a given wall thickness T is positioned in the hollow core 14 and has a first end 25 in operative relationship with the plurality of LEDs and a second end 26 projecting beyond the hollow core 14. A first reflector 28 is attached to the second end 26 of the light guide 22.
  • The housing 12 is thermally conductive to form an extended and integral heat sink and has an extended body-part 50 that preferably is provided with heat-radiating fins 52. A preferred material for the housing 12 is a thermally conductive plastic such as Cool Polymers E3603 thermally conductive polyamide. The printed circuit board 18 has a thermally conducive base 30 that is in direct contact with the housing 12 via an upstanding V-shaped rim 32.
  • The V-shaped rim is tensioned to provide a force-fit against the internal wall 19 a of the open end 19 of the housing 12. Preferably, the printed circuit board is formed of flex-on aluminum.
  • Insertion of the printed circuit board 18 brings the circuitry on the board into press-on contact with the electrical lead-ins 54 (only one of which is shown) that are positioned in a connector 56, for supplying power to the LEDs from an external supply, thus eliminating the need for welding.
  • Utilizing the printed circuit board 18 as the closure mechanism for the housing 12 further eliminates a separate closing member and an O-ring, in addition to the operations necessary for attaching an extra closing member, all ingredients of the prior art construction.
  • Employing the housing itself as an extended heat sink also reduces the number of parts, as well as the weight of the light source.
  • While there have been shown and described what are present considered to be the preferred embodiments of the invention, it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the scope of the invention as defined by the appended claims.

Claims (4)

1. In an LED light source having
a housing; a hollow core projecting from said housing, said hollow core being arrayed about a longitudinal axis; a printed circuit board closing said housing at one end of said hollow core and having a plurality of LEDs operatively fixed thereto about the center thereof; a light guide with a body having a given wall thickness positioned in said hollow core and having a first end in operative relationship with said plurality of LEDs and a second end projecting beyond said hollow core; and a first reflector attached to said second end of said light guide:
the improvement comprising:
said housing being thermally conductive to form an extended and integral heat sink, having externally exposed heat dissipating features, and an internal wall defining a cavity with an open end and said printed circuit board having a periphery in contact with said internal wall for thermal conduction from said circuit board to said heat sink and closing said defined cavity; said circuit board further exposed on an exterior side spanning the open end of said heat sink.
2. The LED light source of claim 1 wherein said printed circuit board has an upstanding rim.
3. The LED light source of claim 2 wherein said rim takes the form of an inverted V.
4. The LED light source of claim 3 wherein said inverted V is tensioned to provide a force-fit with said housing.
US11/109,917 2004-04-22 2005-04-20 LED bulb Active US7092612B1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US11/109,917 US7092612B1 (en) 2005-02-10 2005-04-20 LED bulb
CA 2529399 CA2529399C (en) 2005-02-10 2005-12-07 Led bulb
KR20060008799A KR101238531B1 (en) 2005-02-10 2006-01-27 Led bulb
EP20060001742 EP1691130B1 (en) 2005-02-10 2006-01-27 LED light source
ES06001742T ES2378183T3 (en) 2005-02-10 2006-01-27 LED light source
JP2006031516A JP4921803B2 (en) 2005-02-10 2006-02-08 LED light source
CN2006100070758A CN1818456B (en) 2005-02-10 2006-02-10 Led bulb
US29/261,348 USD619964S1 (en) 2004-04-22 2006-06-13 Light emitting diode bulb connector
US29/339,890 USD610991S1 (en) 2004-04-22 2009-07-09 Portion of a light emitting diode bulb connector
US29/339,891 USD610543S1 (en) 2004-04-22 2009-07-09 Light emitting diode bulb connector
US29/339,895 USD610545S1 (en) 2004-04-22 2009-07-09 Light emitting diode bulb connector
US29/339,892 USD610544S1 (en) 2004-04-22 2009-07-09 Light emitting diode bulb connector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US65182005P 2005-02-10 2005-02-10
US11/109,917 US7092612B1 (en) 2005-02-10 2005-04-20 LED bulb

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US11/058,304 Continuation US7110656B2 (en) 2004-04-22 2005-02-16 LED bulb

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US7092612B1 (en) 2006-08-15
KR20060093028A (en) 2006-08-23
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CN1818456A (en) 2006-08-16
ES2378183T3 (en) 2012-04-09

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