EP3828463A1 - Lamp and corresponding method - Google Patents
Lamp and corresponding method Download PDFInfo
- Publication number
- EP3828463A1 EP3828463A1 EP20206465.5A EP20206465A EP3828463A1 EP 3828463 A1 EP3828463 A1 EP 3828463A1 EP 20206465 A EP20206465 A EP 20206465A EP 3828463 A1 EP3828463 A1 EP 3828463A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lamp
- lamp body
- air
- base portion
- rear base
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 7
- 238000009423 ventilation Methods 0.000 claims abstract description 23
- 230000033228 biological regulation Effects 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 230000004907 flux Effects 0.000 claims description 6
- 230000003213 activating effect Effects 0.000 claims description 2
- 239000004020 conductor Substances 0.000 claims description 2
- ORQBXQOJMQIAOY-UHFFFAOYSA-N nobelium Chemical compound [No] ORQBXQOJMQIAOY-UHFFFAOYSA-N 0.000 description 10
- 229910052736 halogen Inorganic materials 0.000 description 5
- 150000002367 halogens Chemical class 0.000 description 5
- 238000005755 formation reaction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000003491 array Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Images
Classifications
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- 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
-
- 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]
- F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
- F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
-
- 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
- F21S41/19—Attachment of light sources or lamp holders
- F21S41/192—Details of lamp holders, terminals or connectors
-
- 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
- F21S45/42—Forced cooling
- F21S45/43—Forced cooling using gas
-
- 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
- F21V29/508—Cooling arrangements characterised by the adaptation for cooling of specific components of electrical circuits
-
- 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
- F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
-
- 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
- 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
- F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
- F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
-
- 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
- F21Y2107/00—Light sources with three-dimensionally disposed light-generating elements
- F21Y2107/30—Light sources with three-dimensionally disposed light-generating elements on the outer surface of cylindrical surfaces, e.g. rod-shaped supports having a circular or a polygonal cross section
-
- 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
- One or more embodiments may be applied to lamps employing solid-state light generators, e.g. LED light generators.
- One or more embodiments may advantageously be employed in the automotive sector, e.g. as automotive retrofit lamps.
- Lamps employing solid-state, e.g. LED, light generators, are increasingly replacing conventional filament and fluorescent lamps.
- Automotive LED lamps are adapted to provide flux and light distribution characteristics which are compatible with the usage requirements of automotive lamps, wherein the characteristics of intensity and distribution of the luminous flux are particularly important.
- This aspect is particularly meaningful in the automotive sector, e.g. in the implementation of H-type LED lamps which may be used in the place of conventional, e.g. halogen, lamps. This applies both to retrofit and (as the case may be) to first installation applications.
- the state of the art comprises various documents disclosing LED lamps having forced ventilation mechanisms, such as e.g. US Patents 9,677,753 (Briedenassel ); 10,415,787 (Lessard ); 9,470,391 (Itagaki ); 8,118,462 (Inoue ); 8,066,414 (Pabst ); 7,144,140 (Sun ); as well as the US Patent Application Publications such as US2015/0146447 (Kuepper ); 2011/0025211 (Bae ); 2010/0165632 (Liang ); and 2010/0027270 (Huang ).
- One or more embodiments aim at providing improved solutions, adapted to be employed with proper performances in various possible usage scenarios.
- said object may be achieved thanks to a lamp having the features specifically set forth in the claims that follow.
- One or more embodiments may refer to a corresponding method.
- One or more embodiments facilitate achieving a high compatibility (virtually as high as 100%) with conventional halogen lamps, while meeting specifications such as ECE regulations.
- achieving such results may be facilitated by the presence of an air-moving device (a blower or fan, for example) arranged centrally with respect to the lamp.
- an air-moving device a blower or fan, for example
- reference number 10 denotes as a whole a lamp adapted to be used, for example, for the first installation or the retrofit of a light (e.g. a projector) of a vehicle such as a passenger car.
- Figure 1 shows a part of a reflector P of one of the lights (e.g. a headlamp) of such vehicle, which is not visible in its entirety in the figures.
- the lamp 10 may be, for example (and as already stated in the foregoing), a solid-state automotive lamp which may be used e.g. as a retrofit lamp, replacing an equivalent conventional lamp of the H-type, such as a halogen lamp.
- the lamp 10 may include a lamp body of elongated shape, whereon there are mounted, on opposed sides of the body itself, solid-state light sources.
- said sources comprise two linear arrays of (e.g. three) LEDs 141, 142, which extend in the direction of a longitudinal axis X10 of lamp 10.
- a mounting element 20 having e.g. the shape of a flanged cup, is adapted to mount lamp 10 onto a support body P, e.g. a reflector of an automotive lamp.
- the mounting solution illustrated herein is however only one of the possible mounting solutions of lamp 10 on such a support body, such as a reflector of an automotive lamp, e.g. having coupling mechanisms substantially similar to a bayonet coupling ("quarter-turn" mechanisms).
- the presently illustrated ring member 20 is a general example of an element configured for mounting the lamp on a vehicle, said element comprising, at the rear portion of the lamp body, at least one reference formation (such as an annular flange 200a) which is adapted to define a reference plane (denoted as RP in Figure 1 ) transverse to the longitudinal axis X10.
- at least one reference formation such as an annular flange 200a
- RP in Figure 1 a reference plane transverse to the longitudinal axis X10.
- lamp 10 may comprise, in the direction of longitudinal axis X10:
- the lamp body 10 may comprise a laminar element 12 (having features similar to a Printed Circuit Board, PCB) having two mutually opposed surfaces whereon there are arranged the LED light generators 141, 142.
- a laminar element 12 having features similar to a Printed Circuit Board, PCB having two mutually opposed surfaces whereon there are arranged the LED light generators 141, 142.
- the laminar element 12 may be interposed between two complementary parts, e.g. complementary shells, 161, 162, of a printed (metal or plastic) material.
- the parts 161, 162 with the laminar element 12 arranged therebetween may be kept together:
- the arrangement of the LED light generators 141, 142 on the surfaces of laminar element 12 is therefore such that generators 141, 142 project light away from the laminar element 12 in a generally radial direction with respect to axis X10.
- Parts 161, 162 are therefore provided, at the LED light generators 141, 142, with light-permeable portions, such as e.g. transparent openings or portions.
- Such transparent openings or portions are located at the bottom of two cavities 221, 222 which, in the assembled lamp body, form two (mirror) symmetrical recesses with respect to an ideal diametral plane of the lamp body.
- Such diametral plan substantially coincides with the lying plane of laminar element 12.
- the lamp body i.e. the elements 12, 161 and 162 and the mounting element 20
- the lamp body are engageable with each other, with the possibility of mounting lamp 10 on the support body P (see Figure 1 ) with said diametral plane, i.e. with laminar element 12, oriented in a vertical direction, in the plane of the drawing of Figure 1 .
- Axis X10 is oriented in an at least approximately horizontal direction.
- the LED light generators 141, 142 may be arranged substantially at the front (distal) portion 10b of lamp 10.
- the LED light generators 141, 142 may be supplied, in a manner known in itself, by a circuitry 21 housed in the rear portion 10a of lamp 10, via electrical lines or tracks 141a, 142a provided on laminar element 12.
- Circuitry 21 is in turn connected (e.g. via two electrical contact pins 210, adapted to extend through respective openings in the bottom wall of mounting element 20) to e.g. laminar contacts 20a, which are adapted to provide a hot and a ground contact for light generators 141, 142.
- one or more embodiments may envisage to impart, to the rear portion 10a of lamp 10 which hosts circuitry 21, an apertured (so to say cage-like) structure, having elongated, loophole-like apertures which are adapted to define an inlet 100 and an outlet 101 of ventilation air through the rear base portion 10a of the lamp body.
- an apertured (so to say cage-like) structure having elongated, loophole-like apertures which are adapted to define an inlet 100 and an outlet 101 of ventilation air through the rear base portion 10a of the lamp body.
- said openings may be arranged in two arrays of arch-shaped slots, which are located on opposed side with respect to the ideal diametral plane discussed in the foregoing, which passes through laminar element 12, by providing e.g. one array in part 161 and the other array in part 162.
- said two arrays or arch-shaped apertures may be mirror symmetrical with respect to said diametral plane.
- the lamp body (e.g. parts 161, 162 in the lamp 10 as exemplified herein) may have, at least at the rear portion 10a, a cross section (with reference to longitudinal axis X10) which is at least approximately circular, optionally wider than the cross section of front portion 10b.
- the apertures (loopholes) defining the inlet 100 and the outlet 101 of ventilation air may have a arch-like shape, i.e. a C shape, which extends along rounded (e.g. circular) paths lying in transverse planes with respect to axis X10, optionally along paths which are orthogonal and/or centered with respect to axis X10.
- the apertures may thus define ventilation air flow paths CA through the rear portion 10a of lamp 10.
- Such ventilation air by passing through the lamp body along a generally transverse (diametral) path from inlet 100 to outlet 101, is adapted to impinge on circuitry 21 as well, with the effect of removing heat therefrom.
- One or more embodiments may envisage that the heat developed by solid-state light generators 141, 142 during operation may be at least partly transferred towards the rear base portion 10a of lamp 10, by taking advantage of the thermal conductivity of laminar element 12 (PCB), of spacers 171, 172 (if present) and of parts 161, 162.
- PCB laminar element 12
- Such elements, and particularly parts 161, 162 are adapted to be made, in a way known in itself, of a metal or plastic (e.g. printed) material having good heat transfer properties.
- the heat developed by the solid-state light generators 141, 142 during operation may be at least partially dissipated thanks to an air ventilation flow, schematically shown by arrows AF IN , AF OUT in Figure 1 , which passes through the rear portion 10a of lamp 10 entering (AF IN ) through air inlet 100, on a first side S1, and exiting (AF OUT ) from air outlet 101, on a second side S2 (diametrically opposed to first side S1), in a generally transverse direction with respect to the transverse direction defined by axis X10.
- an air ventilation flow schematically shown by arrows AF IN , AF OUT in Figure 1 , which passes through the rear portion 10a of lamp 10 entering (AF IN ) through air inlet 100, on a first side S1, and exiting (AF OUT ) from air outlet 101, on a second side S2 (diametrically opposed to first side S1), in a generally transverse direction with respect to the transverse direction defined by axis X
- the ventilation air flow AF IN , AF OUT takes place therefore in a generally vertical direction, from the bottom to the top, with reference to the viewpoints of Figures 1 and 2 .
- air flow (an essentially convective flow) may advantageously be a forced flow, thanks to an air-moving element 102 (a blower such as a fan, for example) mounted on the rear portion 10a of lamp 10.
- air-moving element 102 a blower such as a fan, for example
- the air-moving element 102 may be arranged at a central position, i.e. at least approximately at axis X10.
- the air-moving element 102 may be mounted on one of the faces of the laminar support member 12.
- the air-moving element may be for example a component such as MagLev Motor Fan, Model UFF3-700, available from Sunonwealth Electric Machine Industry Co., Ltd. of Kaohsiung City, Taiwan (sunon.com), or such as TK FAN DA1504L05S available from Shenzen Tenkai Group Limited of Shenzen, China (tkfan.com).
- the air-moving element 102 may be electrically supplied by the same circuitry the heat whereof is dissipated by element 102, the latter being optionally mounted on said circuitry.
- air inlet 100 and air outlet 101 are located at a common longitudinal position (i.e. "at the same height", or at the same distance from reference plane RF) in the longitudinal direction of lamp 10 identified by axis X10, and the air-moving element 102 is positioned longitudinally in register with air inlet 100 and air oulet 101, i.e. at the same height of air inlet 100 and air outlet 101, always with reference to said longitudinal direction.
- the air-moving element 102 is positioned in the rear base portion 10a of the lamp body between a proximal end of the rear base portion 10a, i.e. the end located remote from the light sources 141, 142 (where, as visible in the figures, the mounting element 20 is located configured to mount the lamp 10 on a vehicle P) and a distal end of the same rear base portion 10a, i.e. the end facing towards the light sources 141, 142.
- Such a central arrangement of element 102 causes the air flow AF IN , AF OUT between air inlet 100 and air outlet 101 to encounter fewer obstacles, so that it may move with higher freedom and efficiency compared to a side arrangement of element 102 (e.g. at the bottom in Figure 1 ).
- This may optionally enable (e.g. in applications which are not particularly critical) to avoid a vertical mounting condition, as exemplified in Figure 1 , e.g. by providing a (forced) air flow AF IN , AF OUT in an at least approximately horizontal direction.
- FIG. 3 in the annexed drawings is taken from the ECE Regulations which impose the specifications for lamps to be used in the automotive sector, and specifically from a text known as Addendum 36: Regulation No. 37, pages 35-38, which lists the dimensional parameters relevant for H7 lamps, which must be met in a LED lamp adapted to be used as a retrofit for an H7 incandescent lamp. Said ECE text for H7 lamps corresponds to the US Specifications SAE 9004 or 9007.
- One or more embodiments enable the implementation of LED lamps which, once energized, are adapted to emit at least 1200 lumen, while having the dimensions specified in the ECE Regulations, as shown in the annexed Figure.
- the white space in the Figure represents the spatial envelope wherein the (LED) retrofit lamp must be insertable together with its components.
- two meaningful dimensional data may consist:
- One or more embodiments are adapted to properly dissipate the heat deriving from the generation, by LED sources such as sources 141, 142, of 1200 lumen, while being compatible with the dimensions specified by the ECE Regulations.
- Figure 1 highlights that:
- simulation values referred to a luminous flus of 1222 lm with a supply current of 700 mA, with LED sources mounted onto a PCB support (MC) show temperature values Ts of the solid-state sources amounting to 130°C, and temperature values of the associated electronic components approximately amounting to 105/115°C.
- a solid-state lamp for a vehicle may comprise:
- the air inlet and the air outlet may be located at a common longitudinal position in said longitudinal direction, and the air-moving element is positioned longitudinally in register with the air inlet and the air outlet in said longitudinal direction.
- the air-moving element may be located in the rear base portion of the lamp body between a proximal end of the rear base portion, in a position remote from the solid-state light sources (where, as visible in the figures, the mounting element 20 is located) and a distal end of the rear base portion, adjacent the solid-state light sources.
- said ventilation apertures may comprise arch-shaped slots in the lamp body.
- the lamp body may comprise a thermally conductive material (e.g. in the portions or parts 161, 162, 12), which facilitates heat transfer from said solid-state light sources at the front portion of the lamp body towards said air-moving element (102) in the rear base portion of the lamp body.
- a thermally conductive material e.g. in the portions or parts 161, 162, 12
- the lamp may comprise a mounting element (e.g. 20) configured to mount the lamp on a vehicle (e.g. on a reflector P), the mounting element comprising, at the rear portion of the lamp body, at least one reference formation (e.g. flange 200a) defining a reference plane (e.g. RP) transverse to said longitudinal direction, the solid-state light sources may be arranged on said support member with a center (e.g. CLS) of said solid-state light sources at a distance (e.g. d1) of approximately 25 mm from said reference plane.
- a mounting element e.g. 20
- the mounting element comprising, at the rear portion of the lamp body, at least one reference formation (e.g. flange 200a) defining a reference plane (e.g. RP) transverse to said longitudinal direction
- the solid-state light sources may be arranged on said support member with a center (e.g. CLS) of said solid-state light sources at a distance (e.g. d
- a lamp as exemplified herein may fit a spatial envelope according to Figure 2 of Addendum 36 of ECE Regulation 37 for H7 lamps (SAE 9004 or 9007, in the United States).
- said solid-state light sources may comprise LED light sources.
- said solid-state light sources when energized, may emit a luminous flux of at least 1200 lm.
- a method of using a lamp as exemplified herein may comprise:
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Abstract
Description
- The description refers to lamps.
- One or more embodiments may be applied to lamps employing solid-state light generators, e.g. LED light generators.
- One or more embodiments may advantageously be employed in the automotive sector, e.g. as automotive retrofit lamps.
- Lamps employing solid-state, e.g. LED, light generators, are increasingly replacing conventional filament and fluorescent lamps.
- This is particularly true in the automotive sector.
- Automotive LED lamps are adapted to provide flux and light distribution characteristics which are compatible with the usage requirements of automotive lamps, wherein the characteristics of intensity and distribution of the luminous flux are particularly important.
- The desire of reproducing, as faithfully as possible, the performance of a conventional lamp, such as a halogen lamp, as regards both size and performance (lumen flux, for instance) must face the obstacle of the high temperature which may be reached by a solid-state, e.g. LED, source, and leads to the study of solutions which may improve heat dissipation.
- This aspect is particularly meaningful in the automotive sector, e.g. in the implementation of H-type LED lamps which may be used in the place of conventional, e.g. halogen, lamps. This applies both to retrofit and (as the case may be) to first installation applications.
- The state of the art comprises various documents disclosing LED lamps having forced ventilation mechanisms, such as e.g.
US Patents 9,677,753 (Briedenassel 10,415,787 (Lessard 9,470,391 (Itagaki 8,118,462 (Inoue );8,066,414 (Pabst );7,144,140 (Sun ); as well as the US Patent Application Publications such asUS2015/0146447 (Kuepper );2011/0025211 (Bae );2010/0165632 (Liang ); and2010/0027270 (Huang ). - It will be appreciated, moreover, that apart from the Lessard and Kuepper documents, the lamps disclosed are not lamps for specific automotive use.
- Documents such as European Patent Application
19204020.2 EP 3 647 649 A1 - "A mounting structure for lighting devices, corresponding lighting device and method", filed on the 18th October 2019 claiming an Italian priority of 31st October 2018 - Designated Inventors Munarin, Castellan and Bizzotto) as well as Italian Patent Application102019000010188 ("Lamp", filed on 26th June 2019 - One or more embodiments aim at providing improved solutions, adapted to be employed with proper performances in various possible usage scenarios.
- According to one or more embodiments, said object may be achieved thanks to a lamp having the features specifically set forth in the claims that follow.
- One or more embodiments may refer to a corresponding method.
- The claims are an integral part of the technical teaching provided herein with reference to the embodiments.
- One or more embodiments facilitate achieving a high compatibility (virtually as high as 100%) with conventional halogen lamps, while meeting specifications such as ECE regulations.
- This may be achieved as regards both size and performance, the possibility being given of reaching flux values of about 1200 lm.
- According to one or more embodiments, achieving such results may be facilitated by the presence of an air-moving device (a blower or fan, for example) arranged centrally with respect to the lamp.
- One or more embodiments will now be described, by way of non-limiting example only, with reference to the annexed Figures, wherein:
-
Figure 1 is a side elevation view of a lamp according to embodiments, -
Figure 2 is an exploded perspective view of a lamp according to embodiments, -
Figure 3 , taken from specifications for the automotive sector, and therefore known in itself, exemplifies overall size characteristics which are to be applied to lamps according to embodiments. - In the following description, one or more specific details are given to provide a thorough understanding of embodiments. The embodiments may be implemented without one or several specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials or operations are not shown or described in detail in order to avoid obscuring certain aspects of embodiments.
- Reference throughout this specification to "an embodiment" or "one embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the possible appearances of phrases such as "in an embodiment" or "in one embodiment" in one or more places throughout the present specification are not necessarily all referring to one specific embodiment. Furthermore, particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
- The references/headings provided herein are given for convenience only, and therefore do not interpret the extent of protection or scope of the embodiments.
- In the figures,
reference number 10 denotes as a whole a lamp adapted to be used, for example, for the first installation or the retrofit of a light (e.g. a projector) of a vehicle such as a passenger car.Figure 1 shows a part of a reflector P of one of the lights (e.g. a headlamp) of such vehicle, which is not visible in its entirety in the figures. - The
lamp 10 may be, for example (and as already stated in the foregoing), a solid-state automotive lamp which may be used e.g. as a retrofit lamp, replacing an equivalent conventional lamp of the H-type, such as a halogen lamp. - In one or more embodiments as exemplified herein, the
lamp 10 may include a lamp body of elongated shape, whereon there are mounted, on opposed sides of the body itself, solid-state light sources. - In one or more embodiments, said sources comprise two linear arrays of (e.g. three)
LEDs lamp 10. - A
mounting element 20, having e.g. the shape of a flanged cup, is adapted to mountlamp 10 onto a support body P, e.g. a reflector of an automotive lamp. - As stated in the foregoing, the profile of such a reflector body is partially shown in dotted lines only in
Figure 1 ; it is assumed, by way of example only, thatlamp 10 is mounted with a side S1 and a side S2 facing downwardly and upwardly, respectively. - Possible advantages of such a mounting position, connected to the possible generation of a (forced) ascending flow of ventilation air AFIN, AFOUT from an
air inlet 100 towards anair outlet 101, will be discussed in the following. - The mounting solution illustrated herein is however only one of the possible mounting solutions of
lamp 10 on such a support body, such as a reflector of an automotive lamp, e.g. having coupling mechanisms substantially similar to a bayonet coupling ("quarter-turn" mechanisms). - For example, the US Patent Application published as
US2010/0213809 A1 (Roehl ) describes an automotive H7 lamp, formed onto a conventional lamp cap with a reference ring including a ring provided with lugs on three sides, which in turn define a reference plane. - As further discussed in the following, the presently illustrated
ring member 20 is a general example of an element configured for mounting the lamp on a vehicle, said element comprising, at the rear portion of the lamp body, at least one reference formation (such as anannular flange 200a) which is adapted to define a reference plane (denoted as RP inFigure 1 ) transverse to the longitudinal axis X10. - In one or more embodiments as exemplified herein,
lamp 10 may comprise, in the direction of longitudinal axis X10: - a
rear base portion 10a, with a proximal end (on the left inFigure 1 ) at which there is arranged amounting element 20, which is adapted to be mounted (e.g. inserted) into support body P, - a
front portion 10b, wherefrom light radiation is emitted in use. - In one or more embodiments as exemplified herein (see e.g. the exploded perspective view in
Figure 2 ), thelamp body 10 may comprise a laminar element 12 (having features similar to a Printed Circuit Board, PCB) having two mutually opposed surfaces whereon there are arranged theLED light generators - In one or more embodiments, as exemplified herein (always refer to the exploded perspective view in
Figure 2 ), thelaminar element 12 may be interposed between two complementary parts, e.g. complementary shells, 161, 162, of a printed (metal or plastic) material. - The
parts laminar element 12 arranged therebetween may be kept together: - at the
rear base portion 10a ofmounting element 20, which is applied and mounted around bothparts - at the
front portion 10b, via ascrew 18 passing through bores provided in theparts laminar element 12, as well as inlaminar spacers parts laminar element 12. - The arrangement of the
LED light generators laminar element 12 is therefore such thatgenerators laminar element 12 in a generally radial direction with respect to axis X10. -
Parts 161, 162 (as well aslaminar spaces LED light generators cavities laminar element 12. - In one or more embodiments, the lamp body (i.e. the
elements lamp 10 on the support body P (seeFigure 1 ) with said diametral plane, i.e. withlaminar element 12, oriented in a vertical direction, in the plane of the drawing ofFigure 1 . Axis X10 is oriented in an at least approximately horizontal direction. - In one or more embodiments, the
LED light generators portion 10b oflamp 10. TheLED light generators circuitry 21 housed in therear portion 10a oflamp 10, via electrical lines ortracks laminar element 12. -
Circuitry 21 is in turn connected (e.g. via twoelectrical contact pins 210, adapted to extend through respective openings in the bottom wall of mounting element 20) toe.g. laminar contacts 20a, which are adapted to provide a hot and a ground contact forlight generators - As already stated in the introduction to the present specification, the desire to reproduce as faithfully as possible, with a
lamp 10 as exemplified herein, the performances of a conventional (e.g. halogen) lamp implies facing the problem of the high temperature which may be reached during the operation of a solid-state source, such as theLED generators i.e. circuitry 21, in the presently exemplifiedlamp 10. - To this end, one or more embodiments may envisage to impart, to the
rear portion 10a oflamp 10 which hostscircuitry 21, an apertured (so to say cage-like) structure, having elongated, loophole-like apertures which are adapted to define aninlet 100 and anoutlet 101 of ventilation air through therear base portion 10a of the lamp body. - In one or more embodiments, said openings may be arranged in two arrays of arch-shaped slots, which are located on opposed side with respect to the ideal diametral plane discussed in the foregoing, which passes through
laminar element 12, by providing e.g. one array inpart 161 and the other array inpart 162. - In one or more embodiments, said two arrays or arch-shaped apertures may be mirror symmetrical with respect to said diametral plane.
- In one or more embodiments, the lamp body (e.g.
parts lamp 10 as exemplified herein) may have, at least at therear portion 10a, a cross section (with reference to longitudinal axis X10) which is at least approximately circular, optionally wider than the cross section offront portion 10b. - In one or more embodiments, the apertures (loopholes) defining the
inlet 100 and theoutlet 101 of ventilation air may have a arch-like shape, i.e. a C shape, which extends along rounded (e.g. circular) paths lying in transverse planes with respect to axis X10, optionally along paths which are orthogonal and/or centered with respect to axis X10. - When the lamp is mounted on the support body P in the previously described conditions - with axis X10 being approximately horizontal and with the diametral plane passing through the
laminar support member 12 approximately in the vertical direction - the apertures may thus define ventilation air flow paths CA through therear portion 10a oflamp 10. Such ventilation air, by passing through the lamp body along a generally transverse (diametral) path frominlet 100 tooutlet 101, is adapted to impinge oncircuitry 21 as well, with the effect of removing heat therefrom. - One or more embodiments may envisage that the heat developed by solid-
state light generators rear base portion 10a oflamp 10, by taking advantage of the thermal conductivity of laminar element 12 (PCB), ofspacers 171, 172 (if present) and ofparts parts - In this way, the heat developed by the solid-
state light generators Figure 1 , which passes through therear portion 10a oflamp 10 entering (AFIN) throughair inlet 100, on a first side S1, and exiting (AFOUT) fromair outlet 101, on a second side S2 (diametrically opposed to first side S1), in a generally transverse direction with respect to the transverse direction defined by axis X10. - As exemplified herein, the ventilation air flow AFIN, AFOUT takes place therefore in a generally vertical direction, from the bottom to the top, with reference to the viewpoints of
Figures 1 and2 . - It has been noticed that such air flow (an essentially convective flow) may advantageously be a forced flow, thanks to an air-moving element 102 (a blower such as a fan, for example) mounted on the
rear portion 10a oflamp 10. - In one or more embodiments, the air-moving
element 102 may be arranged at a central position, i.e. at least approximately at axis X10. For example, the air-movingelement 102 may be mounted on one of the faces of thelaminar support member 12. - In one or more embodiments, the air-moving element may be for example a component such as MagLev Motor Fan, Model UFF3-700, available from Sunonwealth Electric Machine Industry Co., Ltd. of Kaohsiung City, Taiwan (sunon.com), or such as TK FAN DA1504L05S available from Shenzen Tenkai Group Limited of Shenzen, China (tkfan.com).
- In one or more embodiments, the air-moving
element 102 may be electrically supplied by the same circuitry the heat whereof is dissipated byelement 102, the latter being optionally mounted on said circuitry. - In one or more embodiments as exemplified herein,
air inlet 100 andair outlet 101 are located at a common longitudinal position (i.e. "at the same height", or at the same distance from reference plane RF) in the longitudinal direction oflamp 10 identified by axis X10, and the air-movingelement 102 is positioned longitudinally in register withair inlet 100 andair oulet 101, i.e. at the same height ofair inlet 100 andair outlet 101, always with reference to said longitudinal direction. - In one or more embodiments as exemplified herein, the air-moving
element 102 is positioned in therear base portion 10a of the lamp body between a proximal end of therear base portion 10a, i.e. the end located remote from thelight sources 141, 142 (where, as visible in the figures, the mountingelement 20 is located configured to mount thelamp 10 on a vehicle P) and a distal end of the samerear base portion 10a, i.e. the end facing towards thelight sources - Such a central arrangement of
element 102 causes the air flow AFIN, AFOUT betweenair inlet 100 andair outlet 101 to encounter fewer obstacles, so that it may move with higher freedom and efficiency compared to a side arrangement of element 102 (e.g. at the bottom inFigure 1 ). - This may optionally enable (e.g. in applications which are not particularly critical) to avoid a vertical mounting condition, as exemplified in
Figure 1 , e.g. by providing a (forced) air flow AFIN, AFOUT in an at least approximately horizontal direction. -
Figure 3 in the annexed drawings is taken from the ECE Regulations which impose the specifications for lamps to be used in the automotive sector, and specifically from a text known as Addendum 36: Regulation No. 37, pages 35-38, which lists the dimensional parameters relevant for H7 lamps, which must be met in a LED lamp adapted to be used as a retrofit for an H7 incandescent lamp. Said ECE text for H7 lamps corresponds to the US Specifications SAE 9004 or 9007. - One or more embodiments enable the implementation of LED lamps which, once energized, are adapted to emit at least 1200 lumen, while having the dimensions specified in the ECE Regulations, as shown in the annexed Figure.
- The white space in the Figure represents the spatial envelope wherein the (LED) retrofit lamp must be insertable together with its components.
- In this context, it has been remarked that two meaningful dimensional data may consist:
- in the distance (currently denoted as Light Center Length, LCL) of 25 mm from the reference plane RP to the center CLS of the light source, as measured in an axial direction with respect to the lamp, i.e. on the reference axis; and
- in the (maximum) length of the lamp, amounting to 44 mm, as measured from the reference plane RP.
- One or more embodiments are adapted to properly dissipate the heat deriving from the generation, by LED sources such as
sources Figure 1 highlights that: - distance d1 (as measured in the longitudinal direction identified by axis X10), which separates the reference plan RP identified by
flange 200a of mountingelement 20 from the center CLS of thelight source 141, is adapted to approximately amount to 25 mm (taking into account the manufacturing and dimensional tolerances), - length d2 (again, as measured in the longitudinal direction identified by axis X10) of the lamp portion, which extends from reference plane RP to the extremity of the
front portion 10b, is adapted to be kept below the value of 44 mm. - For example, the simulation values referred to a luminous flus of 1222 lm with a supply current of 700 mA, with LED sources mounted onto a PCB support (MC) show temperature values Ts of the solid-state sources amounting to 130°C, and temperature values of the associated electronic components approximately amounting to 105/115°C.
- As exemplified herein, a solid-state lamp (an automotive solid-state lamp, e.g. 10) for a vehicle may comprise:
- a lamp body (e.g. 12, 161, 162, 20) extending in a longitudinal direction (see for example axis X10), the lamp body having a rear base portion (e.g. 10a) and a front portion (e.g. 10b) and including a (central) support body (e.g. 12),
- solid-state light sources (e.g. 141, 142) arranged on said support body in the front portion of the lamp body,
- drive circuitry (e.g. 21) of the light sources, arranged at the rear base portion of the lamp body,
- wherein:
- the rear base portion of the lamp body comprises ventilation apertures (e.g. 100, 101) configured to provide a flow path for ventilation air for said drive circuitry through the rear base portion of the lamp body between mutually opposed first (e.g. S1) and second (e.g. S2) sides of the rear base portion of the lamp body, said ventilation air flow path extending transverse to said longitudinal direction from an air inlet to an air outlet,
- an air-moving element (e.g. 102) is provided, arranged on the support body (12), in the rear base portion of the lamp body, said air-moving element being located in the ventilation air flow path from the air inlet to the air outlet, the air-moving element being activatable to produce an air flow (e.g. AFIN, AFOUT) from said first side towards said second side of the rear portion of the lamp body.
- In a lamp as exemplified herein, the air inlet and the air outlet may be located at a common longitudinal position in said longitudinal direction, and the air-moving element is positioned longitudinally in register with the air inlet and the air outlet in said longitudinal direction.
- In a lamp as exemplified herein, the air-moving element may be located in the rear base portion of the lamp body between a proximal end of the rear base portion, in a position remote from the solid-state light sources (where, as visible in the figures, the mounting
element 20 is located) and a distal end of the rear base portion, adjacent the solid-state light sources. - In a lamp as exemplified herein, said ventilation apertures may comprise arch-shaped slots in the lamp body.
- In a lamp as exemplified herein, the lamp body may comprise a thermally conductive material (e.g. in the portions or
parts - In a lamp as exemplified herein,
the lamp may comprise a mounting element (e.g. 20) configured to mount the lamp on a vehicle (e.g. on a reflector P), the mounting element comprising, at the rear portion of the lamp body, at least one reference formation (e.g. flange 200a) defining a reference plane (e.g. RP) transverse to said longitudinal direction,
the solid-state light sources may be arranged on said support member with a center (e.g. CLS) of said solid-state light sources at a distance (e.g. d1) of approximately 25 mm from said reference plane. - In a lamp as exemplified herein:
- the lamp may comprise a mounting element (e.g. 20) configured to mount the lamp on a vehicle (e.g. on a reflector P), the mounting element comprising, at the rear portion of the lamp body, at least one reference formation (e.g. flange 200a) defining a reference plane (e.g. RP) transverse to said longitudinal direction,
- the length (e.g. d2) of the lamp between the reference plane and the extremity of the front portion may be less than 44 mm.
- A lamp as exemplified herein may fit a spatial envelope according to
Figure 2 of Addendum 36 of ECE Regulation 37 for H7 lamps (SAE 9004 or 9007, in the United States). - In a lamp as exemplified herein, said solid-state light sources may comprise LED light sources.
- In a lamp as exemplified herein, said solid-state light sources, when energized, may emit a luminous flux of at least 1200 lm.
- A method of using a lamp as exemplified herein may comprise:
- mounting (e.g. via element 20) the lamp on a vehicle (e.g. in a reflector P) with said first side and said second side of the rear base portion of the lamp body facing downwardly and upwardly, respectively,
- activating the air-moving element to produce a (forced) air flow (e.g. AFIN, AFOUT) from said first side towards said second side of the rear portion of the lamp body.
- Without prejudice to the basic principles, the implementation details and the embodiments may vary, even appreciably, from what has been described herein by way of non-limiting example only, without departing from the extent of protection.
- The extent of protection is defined by the annexed claims.
-
Lamp 10 Rear portion 10a Front portion 10b Longitudinal axis X10 Support member 12 (LED) light sources 141, 142 Electrically conductive formations 141a, 141b Parts 161, 162 Spacers 171, 172 Screw 18 Mounting element 20 Flange of mounting element 200a Laminar contacts 20a Conductive pins 210 Circuitry 21 Recesses 221, 222 Air inlet 100 Air outlet 1101 Air-moving element 102 Flow of ventilation air AFIN, AFOUT First side S1 Second side S2 Reflector P Reference plane RP Center of light sources CLS Distances d1, d2
Claims (11)
- An automotive solid-state lamp (10) for a vehicle, comprising:a lamp body (12, 161, 162, 20) extending in a longitudinal direction (X10), the lamp body having a rear base portion (10a) and a front portion (10b) and including a support member (12),solid-state light sources (141, 142) arranged on said support member (12) at the front portion (10b) of the lamp body (12, 161, 162, 20),drive circuitry (21) of the light sources (141, 142) arranged at the rear base portion (10a) of the lamp body (12, 161, 162, 20),wherein:the rear base portion (10a) of the lamp body (12, 161, 162, 20) comprises ventilation apertures (100, 101) configured to provide a flow path for ventilation air of said drive circuitry (21) through the rear base portion (10a) of the lamp body (12, 161, 162, 20) between mutually opposed first (S1) and second (S2) sides of the rear base portion (10a) of the lamp body (12, 161, 162, 20), said ventilation air flow path extending from an air inlet (100) to an air outlet (101) transverse to said longitudinal direction (X10),an air-moving element (102) is provided arranged on said support member (12) in the rear base portion (10a) of the lamp body (12, 161, 162, 20), the air-moving element (102) being located in the air flow path between the air inlet (100) and the air outlet (101), the air-moving element (102) activatable to produce air flow (AFIN, AFOUT) from said first side (S1) towards said second side (S2) of the rear portion (10a) of the lamp body (12, 161, 162, 20).
- The lamp (10) of claim 1, wherein the air inlet (100) and the air outlet (101) are located at a common longitudinal position in said longitudinal direction (X10) and the air-moving element (102) is positioned longitudinally in register with the air inlet (100) and the air outlet (101) in said longitudinal direction (X10) .
- The lamp (10) of claim 1 or claim 2, wherein the air-moving element (102) is located in the rear base portion (10a) of the lamp body (12, 161, 162, 20) between a proximal end of the rear base portion (10a) remote from the solid-state light sources (141, 142) and a distal end of the rear base portion (10a) adjacent the solid-state light sources (141, 142).
- The lamp (10) of any of claims 1 to 3, wherein said ventilation apertures (100, 101) comprise arch-shaped slots in the lamp body (161, 162).
- The lamp (10) of any of the previous claims, wherein the lamp body comprises thermally conductive material (161, 162, 12) facilitating heat transfer from said solid-state light sources (141, 142) at the front portion (10b) of the lamp body (12, 161, 162, 20) towards said air-moving element (102) provided in the rear base portion (10a) of the lamp body.
- The lamp (10) of any of the previous claims, wherein:the lamp comprises a mounting element (20) configured to mount the lamp (10) on a vehicle (P), the mounting element (20) comprising at the rear base portion (10a) of the lamp body (12, 161, 162, 20) at least one reference formation (200a) defining a reference plane (RP) transverse to said longitudinal direction (X10),the solid-state light sources (141, 142) are arranged on said support member (12) with a center (CLS) of said solid-state light sources (141, 142) at a distance (d1) of approximately 25mm from said reference plane (RP).
- The lamp (10) of any of the previous claims, wherein:the lamp comprises a mounting element (20) configured to mount the lamp (10) on a vehicle (P), the mounting element (20) comprising at the rear base portion (10a) of the lamp body (12, 161, 162, 20) at least one reference formation (200a) defining a reference plane (RP) transverse to said longitudinal direction (X10),the length (d2) of the lamp (10) between the reference plane (RP) and the extremity of the front portion (10b) is less than 44mm.
- The lamp (10) of any of the previous claims, wherein the lamp fits a spatial envelope according to Figure 2 of Addendum 36 of ECE Regulation 37 for H7 lamps (SAE 9004 or 9007).
- The lamp (10) of any of the previous claims, wherein said solid-state light sources comprise LED light sources (141, 142).
- The lamp (10) of any of the previous claims, wherein said solid-state light sources (141, 142), when energized, emit a luminous flux of at least 1200 lm.
- A method of using the lamp (10) of any of the previous claims, the method comprising:mounting (20) the lamp (10) on a vehicle (P) with said first side (S1) and said second side (S2) of the rear base portion (10a) of the lamp body (12, 161, 162, 20) facing downwardly and upwardly, respectively,activating the air-moving element (102) to produce air flow (AFIN, AFOUT) from said first side (S1) towards said second side (S2) of the rear portion (10a) of the lamp body (12, 161, 162, 20).
Applications Claiming Priority (1)
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IT102019000022209A IT201900022209A1 (en) | 2019-11-26 | 2019-11-26 | Lamp and corresponding procedure |
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ID=70009107
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EP20206465.5A Pending EP3828463A1 (en) | 2019-11-26 | 2020-11-09 | Lamp and corresponding method |
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