Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S8/00—Lighting devices intended for fixed installation
  • F21S8/02—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters
• • 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
  • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
  • F21V29/507—Cooling arrangements characterised by the adaptation for cooling of specific components of means for protecting lighting devices from damage, e.g. housings
• • 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
  • 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
• • 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 light-emitting assembly.
• the present invention further relates to an LED retrofit lamp having the light-emitting assembly and an as- sembling method thereof.
• LED retrofit lamps of the types such as MR16, PAR38, A60 and GX53 are seethingly finding the way of replacing traditional illuminating devices such as incandescent and fluorescent lamps because they are more energy-saving and has a smaller size and a longer service lifetime.
• LED package itself can reach high efficiency, such as 1401m/W for cold white and 901m/W for warm white and they are supposed to have a long lifetime as to 50,000 hours, but when the LED is integrated into a retrofit lamp together with an LED driver, a thermal management device and an optical component, the efficiency and service lifetime of the retrofit lamp are highly dependent upon how to design the driver, heat sink device and optical component. Some of the electri- cal power consumed in the LED is converted to heat rather than light.
• the traditional MR- 16 LED retrofit lamp has problems in two aspects.
• an outer profile and size of a heat sink of the traditional MR-16 LED retrofit lamp are restricted by a relatively small lamp fixture because, when the traditional halogen light source is replaced by an LED light source, the LED light source must be assured to be capable of being assembled into the lamp fixture of the re- placed MR-16 halogen lamp, and meanwhile, the heat sink in coordination with the LED light source also should be assured to be capable of passing through the lamp fixture.
• the lamp fixture generally has a big opening for accommodating the light source and a relatively small rear opening for fixing the heat sink and other components.
• the outer profile of the heat sink must be designed to be so small that it can pass through the small opening.
• a small heat sink can only allow the LED light source to work at a low power such as 4-5W, thus, the light output capabilities- ity thereof is poor.
• the MR- 16 halogen lamp is usually used as a downlight mounted in the ceiling, in which the working environment is close and the air convection condition is poor, thus, the heat sink must be designed to be rela- tively big for providing good heat dissipation performance.
• the present invention provides a light-emitting assembly.
• the light-emitting assembly can replace a light source such as halogen lamp and incandescent lamp in an illuminating device; moreover, a big heat sink having a good heat dissipation performance can be used so that use of a high-power LED light source is allowed.
• application of the existing lamp fixture simplifies the installation and reduces the cost.
• the present invention further provides an LED retrofit lamp having the light-emitting assembly and an assembling method thereof.
• the first object of the present invention is accomplished via a light-emitting assembly.
• the light-emitting assembly comprises a housing, a light source provided in the housing and a heat sink provided on an outer surface of the housing, wherein the light-emitting assembly further comprises a holding assembly that comprises a holding rod partially extending from the housing and movable between an initial position and a locking position, wherein the holding rod is inserted into the heat sink in the initial position and presses the heat sink against the outer surface in the locking position.
• the heat sink can be installed individually after the housing of the light-emitting assembly is installed in a position where it is to be installed, it is unnecessary to consider the size of the position where the housing of the light- emitting assembly is to be installed when the heat sink is designed, which can prominently improve the heat dissipation performance of the whole light-emitting assembly. Moreover, there is no need to provide a new installation fixture dedi- cated to the light-emitting assembly for adaptation to the heat sink, thus the cost is reduced. Besides, the light- emitting assembly of the present application has a simpler structure and is more easily assembled.
• the holding rod has a cylindrical rod section, a first stop end and a second stop end that are formed at both ends of the cylindrical rod section, respectively.
• the cylindrical rod section allows rotation of the holding rod around its own longitudinal axis while allowing extension and movement of the holding rod in the housing.
• the first stop end and the second stop end serve the function of stopping the holding rod and the heat sink provided on the holding rod, respectively.
• the housing comprises a holding rod assembling cavity for accommodating the holding rod, wherein the holding rod assembling cavity comprises a first cylindri- cal cavity section and a second cylindrical cavity section, wherein a diameter of the first cylindrical cavity section is bigger than that of the second cylindrical cavity section so as to form a stop flange at a joint between the first cylin- drical cavity section and the second cylindrical cavity section.
• the stop flange cooperates with the first stop end of the holding rod to prevent the holding rod from escaping from the housing.
• the holding assembly further comprises a com- pression spring that has both ends against the first stop end and the stop flange, respectively.
• a prestressing force is generated as the compression spring is pressed by the first stop end and the stop flange.
• the prestressing force is transferred to the heat sink via the second stop end so as to assure the heat sink to be tightly against the outer surface of the housing. This further improves the heat transfer performance between the heat sink and the housing.
• the second stop end is a flat end and has a length bigger than a diameter of the cylindrical rod section and a width equal to or smaller than the diameter of the cylindrical rod section.
• the holding assembly further comprises a stop nut accommodated in the via and screwed into threads on the cylindrical rod section so as to be pressed against an end surface of the housing defining the holding rod assembling cav- ity.
• a compressed degree of the compression spring can be adjusted by screwing the stop screw so that the prestressing force is altered.
• the housing has a conic section that has the outer surface against which the heat sink is pressed, and the heat sink has an accommodation cavity for accommodating the conic section.
• This structure assures a contact area as big as is possible between the heat sink and the housing so as to improve the heat transfer efficiency .
• the light source is an LED light source that is more energy- saving, has a smaller size and a longer service lifetime, and also can provide very favorable light output efficiency .
• the LED retrofit lamp comprises a lamp fixture and a light-emitting assembly fixed into the lamp fixture, wherein the light-emitting assembly is the light- emitting assembly mentioned above.
• the LED retrofit lamp of the present invention uses a lamp fixture of an illuminating device to be replaced thereby, and has a favorable heat dissipation performance, a high power and a low cost, and is easily installed.
• the last object of the present invention is accomplished via an assembling method of the LED retrofit lamp.
• the assembling method comprises steps of: a) installing a housing with a light source into a lamp fixture from below; b) installing a heat sink into the lamp fixture from above to press the same against an outer surface of the housing; c) enabling a holding rod partially extending from the housing to pass through a via of the heat sink; d) pulling the holding rod in a direction away from the housing so that a second stop end of the holding rod protrudes from the via; and e) rotating the second stop end to press the heat sink against the outer surface.
• Fig. 1 is a sectional view of an LED retrofit lamp of the present invention
• Fig. 2 is a schematic diagram of an assembled LED retrofit lamp of the present invention.
• Fig. 1 is a sectional view of an LED retrofit lamp of the present invention. It can be seen from Fig. 1 that the LED retrofit lamp comprises a light-emitting assembly and a lamp fixture 7 for fixing the light-emitting assembly.
• the lamp fixture 7 is an original lamp fixture of an illuminating device to be replaced.
• the light-emitting assembly comprises a housing 1, a light source 2 provided in the housing 1 and a heat sink 3 provided on an outer surface lc of the housing 1. It can be further seen from Fig.
• the light-emitting assembly further comprises a holding assembly, wherein holding assembly comprises a holding rod 4 that partially extends from the housing 1 and is movable between an initial position and a locking position, wherein the holding rod 4 is inserted into the heat sink 3 in the initial position and presses the heat sink 3 against the outer surface lc in the locking position.
• the light source 2 is an LED light source.
• the holding rod 4 has a cylindri- cal rod section 4a, a first stop end 4b and a second stop end 4c that are formed at both ends of the cylindrical rod section 4a, respectively.
• the housing 1 comprises a holding rod assembling cavity la for accommodating the holding rod 4, wherein the holding rod assembling cavity la comprises a first cylindrical cavity section la' and a second cylindrical cavity section la' ' , wherein a diameter of the first cylindrical cavity section la' is bigger than that of the second cylindrical cavity section la' ' so as to form a stop flange lb at a joint between the first cylindrical cavity section la' and the second cylindrical cavity section la''.
• the holding assembly further comprises a compression spring 5 that has both ends against the first stop end 4b and the stop flange lb, respectively.
• the second stop end 4c is a flat end and has a length bigger than a diameter of the cylindrical rod section 4a and a width equal to or smaller than the diameter of the cylindrical rod section 4a.
• a cross section of the second stop end 4c is elliptical (see Fig. 2), and of course, it also can be rec- tangular.
• the heat sink 3 opens a via 3a through which the holding rod 4 passes, wherein a cross section profile of the via 3a is consistent with a cross section profile of the second stop end 4c so as to assure the holding rod to be able to pass through the via 3a.
• the holding assembly further comprises a stop nut 6 accommodated in the via 3a and screwed into threads on the cylindrical rod section 4a so as to be pressed against an end surface of the housing 1 defin- ing the holding rod assembling cavity la.
• the housing 1 has a conic section that has the outer surface lc against which the heat sink 3 is pressed, and the heat sink 3 has an accommodation cavity for accommodating the conic section.
• the heat sink 3 has a wedge-shaped insert section at one side thereof facing the housing 1, and the accommodation cavity is in the insert section.
• the insert section can be inserted into a space between the housing 1 and the lamp fixture 7, thus a contact area is assured to be as big as is possible between the heat sink 3 and the housing 1.
• the size and profile of the heat sink can be designed according to a practical output efficiency of the light-emitting assembly for satisfying heat dissipation requirements.
• Fig. 2 is a schematic diagram of an assembled LED retrofit lamp of the present invention.
• the heat sink 3 has a relatively big size notably bigger than that of the lamp fixture 7.
• the heat sink 3 obviously cannot be installed into the lamp fixture 7 from below.
• the LED retrofit lamp of the present invention When the LED retrofit lamp of the present invention is used as a downlight, firstly, a housing 1 with a light source 2 is installed into a lamp fixture 7 below a ceiling; then, a heat sink 3 is installed into the lamp fixture 7 above the ceiling to press the same against an outer surface lc of the housing 1, meanwhile, a holding rod 4 partially extending from the housing 1 is enabled to pass through a via 3a of the heat sink 3; thereafter, the holding rod 4 is pulled in a direction away from the housing 1 so that a second stop end 4c of the holding rod 4 protrudes from the via 3a; and finally, the second stop end 4c is rotated to press the heat sink 3 against the outer surface lc, thus the assembling process is completed .

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
• Non-Portable Lighting Devices Or Systems Thereof (AREA)
• Fastening Of Light Sources Or Lamp Holders (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=46604287

Family Applications (1)

Country Status (3)

Cited By (3)

Families Citing this family (1)

Citations (7)

Family Cites Families (4)

• 2011
  • 2011-11-25 CN CN201110382617.0A patent/CN103133891B/zh not_active Expired - Fee Related
• 2012
  • 2012-07-23 WO PCT/EP2012/064402 patent/WO2013075853A1/en active Application Filing
  • 2012-07-23 EP EP12743115.3A patent/EP2783157B1/de not_active Not-in-force

Patent Citations (7)

Also Published As

Similar Documents

Legal Events