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
  • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
  • F21V29/89—Metals
• • 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
  • F21K9/233—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 a spot light distribution, e.g. for substitution of reflector lamps
• • 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
  • F21V29/71—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
  • F21V29/713—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements in direct thermal and mechanical contact of each other to form a single system
• • 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
  • F21V29/83—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
• • 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
  • F21V19/00—Fastening of light sources or lamp holders
  • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
  • F21V19/003—Fastening of light source holders, e.g. of circuit boards or substrates holding light sources
  • F21V19/0035—Fastening of light source holders, e.g. of circuit boards or substrates holding light sources the fastening means being capable of simultaneously attaching of an other part, e.g. a housing portion or an optical component

Definitions

• the present invention relates to a heat sink for an illuminating device and an illuminating device having the heat sink .
• the die casting or extru ⁇ sion process is used more and more for manufacturing the heat sink for heat dissipation of the illuminating device.
• Such heat sink for instance, can be directly configured as a cup- shaped body, and then, on one hand, it can be used as an ac ⁇ commodation part to receive therein heating parts of the il ⁇ luminating device such as light engine, and on the other hand, it effectively dissipates heat of the heating parts.
• a heat dissipating body with a lot of individual air guiding cavities on the outer circumferential wall can be made through the die casting process, but the heat dissipating body manufactured thereby has a high cost.
• a heat dissipating body with a lot of fins on the outer circumferential wall can be made through the extrusion process, while such heat dissi- pating body consumes a lot of machining time and produces a high defective rate during the manufacture.
• the existing heat sink of the illuminating device should be improved to enable it to be manufactured simply and precisely with characteristics of high thermal conductivity and low cost.
• the object of the present invention lies in providing a heat sink for an illuminating device and an illuminating device having the heat sink.
• the present invention provides a heat sink for an illuminating device, characterized in that the heat sink comprises a first housing and a second housing, the first housing is a first metal stamping part, and the second hous ⁇ ing is a second metal stamping part, and the first metal stamping part and the second metal stamping part are
• the heat sink according to the present invention gives up the one-piece manufacturing method in the prior art, and configures the heat sink in two parts, thereby, the first and second housings can be firstly simply manufactured, and then the two parts are assembled together to form a complete heat sink.
• the defective rate of the heat sink during the manufacture can be reduced, and the as ⁇ Sild heat sink can be ensured to have good thermal conduc ⁇ tivity.
• the first housing is in thermal contact with a first part of the illuminating device at one side, and defines, together with the second housing, a first space at the other side, and the first space is in air communication with the outside.
• the first housing can directly dissipate heat for the first part, and also can further indirectly guide, via the first space, the heat generated by the first part to the outside of the heat sink. Consequently, two heat dissipation paths for the illuminating device, especially the first part which generates heat, are formed.
• the first housing comprises a recessed region which support the first part and an air guiding region, the air guiding region extends radially outwardly from the recessed region at one side away from the second housing, and a flow path ena- bling communication of the first space with the outside is formed in the air guiding region.
• the first housing herein is configured in, for instance, a basin structure with one end closed, and the air guiding region as an extending part, extends outwardly laterally from an open end of the recessed region.
• the first space surrounds the recessed region. Since the first part of the illuminating device which generates heat can be installed in the recessed region, the first space pro- vided surrounding the recessed region can form a convection region in the whole circumferential direction so as to per ⁇ form highly effective heat dissipation.
• At least one air guiding hole forming the flow path is opened in the air guiding region.
• the air guiding hole can ensure air communication of the first space with the outside; there ⁇ by the convective effect can be realized for heat dissipa ⁇ tion.
• the second housing comprises an annular second bottom region, and a second central region and a second side wall which re ⁇ spectively extend from two sides of the second bottom region to the first housing, wherein the second central region is in thermal contact and mechanical connection with the recessed region.
• a height of the second central region is smaller than that of the second side wall.
• the second central region is configured as a protrusion, and a top surface of the protrusion is in thermal contact with a bottom surface of the recessed region.
• the top surface of the protrusion is preferably in form-fitted thermal contact with the bottom surface of the recessed region.
• the two surfaces can be configured as, for instance, planes.
• a removable joint structure is present between the second cen ⁇ tral region and the recessed region. With the help of the joint structure, the first housing and the second housing can be simply and reliably fixed together.
• the joint structure comprises at least one assembling hole opened in the bottom surface of the recessed region and at least one fastener extending from the second central region to run through the at least one assembling hole.
• a free end of the fastener exerts a pressure onto the first housing at one side of the first housing supporting the first part. The free end of the fastener, passing through the assembling hole, pene- trates into the space defined by the first housing itself for fixing together the first and second housings.
• the free end is bent to an angle relative to a central axis of the heat sink, and the recessed region is sandwiched be- tween the free end and the second central region.
• the fasten ⁇ er is a bendable tablet. When the first and second housings are assembled together, the free end of the fastener can be bent with an external force so that it is ensured that the free end can be used as a stop part fixed in the first hous ⁇ ing, and further presses the bottom surface of the first housing to the second central region of the second housing.
• the second central region defines a second space at one side facing away from the first part for receiving a second part equipped for the illuminating device.
• the second part can be, for instance, a driver or the like for supplying power to the first part of the illuminating device.
• a plurality of the air guiding holes distributed uniformly in a circumferential direction are opened in the air guiding re ⁇ gion. The number and shape of the air guiding holes can be varied according to practical demand, and then the convective effect of the first space with the outside can be improved.
• via holes for the first part and fittings of the first part are opened respectively in the second central region and the recessed region.
• Connectors such as wires or pins for elec- trically connecting the first part and the second part can run through these via holes.
• the present invention further relates to an illuminating device, comprising a light engine configured as the first part, a driver configured as the second part and a lens.
• a light engine configured as the first part
• a driver configured as the second part
• a lens configured as the lens
• tion further comprises the above heat sink.
• the light engine configured as the first part will generate a lot of heat dur ⁇ ing operation.
• the first part is located in the recessed region of the first housing, and the second part is located in the second space defined by the second housing.
• the light engine is fixed in the recessed region, and the light engine is controlled by the driver lo- cated in the second space.
• a support is further comprised.
• the support has one end fixing the first part on the first housing of the heat sink, and the other end in fixed connection with the lens.
• the support is located in the recessed region of the first housing, and the lens and the support define a sealed cavity receiving the first part.
• Fig. 1 shows a 3D exploded view of a first embodiment of a heat sink according to the present invention
• Fig. 2 shows a 3D view of the heat sink as shown in Fig. 1 during assembling
• Fig. 3 shows a 3D view of the heat sink as shown in Fig. 1 after assembling
• Fig. 4 is a sectional view of a first embodiment of the heat sink according to the present invention.
• Fig. 5 is a 3D exploded view of a first embodiment of an il ⁇ luminating device according to the present invention
• Fig. 6 shows a sectional view of the illuminating device as shown in Fig. 5.
• FIG. 1 shows a 3D exploded view of a first embodiment of a heat sink according to the present invention.
• a heat sink 10 according to the present invention is configured for an illu ⁇ minating device, and has a first housing 11 shown in the up ⁇ per part of the figure and a second housing 12 shown in the lower part.
• the first housing 11 is a first metal stamping part
• the second housing 12 is a second metal stamping part also formed through a stamping process.
• the first housing 11 is configured in a basin structure, and comprises a recessed region 11.1 located in the center and an air guiding region 11.2 extending radially outwardly from a free end of the recessed region 11.1, i.e. in a horizontal direction in the figure. Since the recessed region 11.1 it- self defines an accommodation space, a bottom surface of the recessed region 11.1 can support part of components of the illuminating device, and can radiate heat of the components received in this accommodation space.
• the air guiding region 11.2 in the present embodiment is configured as an annular, horizontally extending section, and extends horizontally, radially, outwardly starting from an upper end of the recessed region 11.1.
• the air guiding region 11.2 is opened with a plurality of air guiding holes 11.3, which air guiding holes are uniformly distributed such that air above and below the air guiding region 11.2 can exchange and flow.
• the second housing 12 in the lower part of the figure can be taken as a base to be installed together with the first hous ⁇ ing 11 used as a top cover.
• the second housing 12 comprises: a second side wall 12.3 as an outer circumferential wall, a second bottom region 12.1 extending inwardly from a bottom end of the second side wall 12.3, and a second central region 12.2 extending inwardly and upwardly from the second bottom region 12.1.
• the second central region 12.2 is configured as a protrusion, and has a plane in the center and a side wall connecting the plane and the second bottom region 12.1 together.
• the side wall can be used as an inner circumferential wall and in opposite arrangement to the second side wall 12.3.
• a removable joint structure is present between the second central region 12.2 and the recessed region 11.1.
• the joint structure comprises assembling holes 11.4 opened in the bot ⁇ tom surface of the recessed region 11.1 and fasteners 12.4 extending upwardly from the plane of the second central re ⁇ gion 12.2. Quantities and shapes of the fasteners 12.4 and the assembling holes 11.4 match, respectively.
• the second central region 12.2 defines a second space R2 (see Fig. 4) at one side facing away from a first part 1, i.e. in the lower part shown in the figure.
• a second part equipped for the illuminating device, such as driver or the like, can be received in the second space R2.
• a plurality of via holes are also provided in the second central region 12.2 and the recessed region 11.1 so that fittings of the illumi ⁇ nating device such as wires can run through the via holes.
• Fig. 2 shows a 3D view of the heat sink as shown in Fig. 1 during assembling.
• two fasteners 12.4 formed on the second housing 12, running through two assembling holes 11.4 equipped, respectively, extend into the space de ⁇ fined by the recessed region 11.1.
• the first housing 11 and the second housing 12 can be ensured to be fixed in posi- tion to each other.
• Fig. 3 shows a 3D view of the heat sink as shown in Fig. 1 after assembling.
• the first housing 11 and the second housing 12 are removably assembled together with the aid of the fas ⁇ teners 12.4.
• a free end of each fastener 12.4 exerts a pressure on the first housing 11, especially the re ⁇ Waitd region 11.1, in the space defined by the recessed re ⁇ gion 11.1.
• the free ends are bent to an angle, preferably 90°, relative to a central axis of the heat sink 10; conse ⁇ quently, the recessed region 11.1 of the first housing 11 is sandwiched between the free end of the second housing 12 and the second central region 12.2.
• the fasteners 12.4 preferably are configured as bendable tab ⁇ lets .
• positions of the fasteners and the assembling holes equipped therefor can be three or more.
• the fastener also can be configured as posi- tioning column or the like deformable under an external force .
• Fig. 4 shows a sectional view of a first embodiment of the heat sink according to the present invention.
• the first hous- ing 11 provides, at one side facing upwardly, the recessed region 11.1 that can be in thermal contact with the first part of the illuminating device, and at the other side, it defines, together with the second housing 12, the first space Rl for heat dissipation, therefore, the first space Rl is in air communication with the outside by means of the plurality of air guiding holes 11.3 opened in the air guiding region 11.2.
• the second housing 12 has a cross section resembling "W", and then, it can be ensured that the first space Rl sur ⁇ rounds the recessed region 11.1 which is in direct contact with a heat source so as to improve the heat dissipation ef ⁇ fect of the heat sink 10.
• the second central region 12.2 is in thermal contact and mechani ⁇ cal connection with the recessed region 11.1, that is to say, the top surface in the center of the second central region 12.2 and the bottom surface of the recessed region 11.1 are in thermal contact at an area as big as possible.
• the top surface in the cen ⁇ ter of the second central region i.e. the top surface of the protrusion, viewed from the cross section
• the top surface in the cen ⁇ ter of the second central region can be configured in a wave shape or other shapes, correspondingly, the bottom surface of the recessed region is also configured in a shape corresponding to the profile of the top surface in the cross section, such that direct good thermal contact of the first and second housings is realized.
• Fig. 5 shows a 3D exploded view of a first embodiment of an illuminating device according to the present invention.
• An illuminating device 20 according to the present invention comprises a light engine 1, a driver 2, a lens 3, a support 4 and the heat sink 10 as shown in Figs. 1-4.
• the light engine 1 generates heat during operation and therefore can be regarded as the first part 1 of the illuminating device 20, and the driver 2 supplies power to the light engine 1 and therefore can be taken as the second part 2 of the illuminat ⁇ ing device 20.
• the driver 2, the heat sink 10, the light engine 1, the support 4 and the lens 3 are assembled together in turn so as to constitute a com ⁇ plete illuminating device 20. Therefore, the support 4 is particularly configured as a joint piece, which, at one end, fixes the light engine 1 on the first housing 1 of the heat sink 10, and at the other end, can be in fixed connection with the lens 3.
• a thermal conductive gasket 5 is further provided between the light engine 1 and the first housing 11.
• Fig. 6 shows a sectional view of the illuminating device as shown in Fig. 5.
• the light engine 1, i.e. the first part is located in the recessed region 11.1 of the first housing 11, and the driver 2, i.e. the second part 2, is located in the second space R2 defined by the second housing 12 itself.
• the support 4 is installed in the recessed region 11.1 of the first housing 11, and the lens 3 and the support 4 define a sealed cavity accommodating the first part 1.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Optics & Photonics (AREA)
• Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

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Citations (4)

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• 2013
  • 2013-06-17 CN CN201310239670.4A patent/CN104235795A/zh active Pending
• 2014
  • 2014-05-28 EP EP14728878.1A patent/EP2984406B1/en not_active Not-in-force
  • 2014-05-28 WO PCT/EP2014/061029 patent/WO2014202360A1/en active Application Filing

Patent Citations (4)

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