CN202203807U

CN202203807U - LED down lamp and lamp body thereof

Info

Publication number: CN202203807U
Application number: CN2011203028231U
Authority: CN
Inventors: 刘学勇; 邓明伟; 张诗彪
Original assignee: Ningbo Andy Optoelectronic Co Ltd
Current assignee: Ningbo Dejia Lighting & Technology Co., Ltd.
Priority date: 2011-08-19
Filing date: 2011-08-19
Publication date: 2012-04-25
Anticipated expiration: 2021-08-19

Abstract

The utility model relates to a lamp body of an LED down lamp, which includes a down lamp body, a cover plate and a radiator, wherein one end of the down lamp body is opened; the cover plate covers the other end of the down lamp body; the radiator is formed on the outer surface of the cover plate; the down lamp body includes a first down lamp part connected with the cover plate and a second down lamp part connected with one end of the first down lamp part away from the cover plate; a step surface facing to the opening direction of the down lamp body is formed between the inner surfaces of the first and the second down lamp parts; and a ring-shaped groove and a plurality of fixing holes are formed on the step surface. As the lamp body can be matched with the traditional LED lamp panel as well as an integrated LED light source, the lamp body has stronger matching performance; besides, the utility model further provides an LED down lamp provided with the lamp body.

Description

LED Down lamp and lamp body thereof

Technical field

The utility model relates to a kind of lighting, relates in particular to a kind of LED Down lamp and lamp body thereof.

Background technology

Down lamp is mounted in the lighting of the light down-ejection type on roof, and it is widely used in market, hotel, large supermarket, school, hospital etc.Adopt metal halide lamp or the fluorescent lamp Down lamp as light source, its power consumption is higher, lamp tube service life and photochromic soft inadequately.

Light emitting diode (Light Emitting Diode, LED) luminous efficiency of light source high and also its photochromic soft, power consumption is few, long service life, can improve the some shortcomings that the conventional light source Down lamp exists.

But the led light source of existing market generally includes integrated LED light source and LED lamp plate.Integrated LED light source only has a light-emitting zone, and light is more concentrated, is similar to spot light, when using, needs a reflector that the light of this light-emitting zone is reflected away usually.The LED lamp plate then comprises a circuit board and is arranged at a plurality of LED lamp pearls on this circuit board that light relatively disperses, and when using, need the photoconduction on a plurality of LED lamp pearls come out to reflect away again by light-guide devices such as lens boards usually.So, because the structure of led light source and supporting with it element difference cause Down lamp in the market to want door can only dispose the LED lamp plate, or can only dispose integrated LED light source.

The utility model content

In view of this, be necessary the LED Down lamp and the lamp housing thereof that provide a kind of matching stronger, to solve the existing relatively poor technical problem of LED Down lamp matching.

The utility model is achieved in that

A kind of lamp body of LED Down lamp, it comprises cylindrical shell, cover plate and radiator.Said cylindrical shell one end opening, the other end is covered with said cover plate, and said radiator is formed at the outer surface of said cover plate.Said cylindrical shell comprises first portion that is connected with said cover plate and is connected in the second tin portion of said first portion away from cover plate one end.Be formed with a step surface between the inner surface of said first portion and second portion towards the opening direction of cylindrical shell.Be formed with annular groove and a plurality of fixing hole on the said step surface.

Further, said each radiating fin all extends along the radially upper curve of cylindrical shell.

Further, said projection is a hollow convex column, and said radiator also comprises the ribs that is formed at hollow convex column inside.

Further, said ribs is a cross.

Further, said a plurality of radiating fin is positioned on the same plane away from an end of cover plate.

Further; Said cylindrical shell comprises first portion that is connected with said cover plate and is connected in the second tin portion of said first portion away from cover plate one end, is formed with a step surface towards the opening direction of cylindrical shell between the inner surface of said first portion and second portion.

Further, said a plurality of radiating fin further extends to the outer surface of first portion.

Further, the thickness of said each radiating fin increases along the direction near cylindrical shell gradually.

Further, said cylindrical shell also comprises the annular lip of radially extending outward along cylindrical shell away from an end of first portion from second portion.

Further, said lamp body is formed in one.

And a kind of LED Down lamp comprises said lamp body, LED illuminating module and power supply module.

Further, said power supply module is fixed in the side of said radiator away from cover plate.

Further, be formed with through hole on the said cover plate, said power supply module is the power supply of LED illuminating module through the electric wire that runs through said through hole.

Further, be formed with the fixed leg that is used for fixing the power supply module on the outer surface of said cover plate, the height of said fixed leg is higher than the height of hollow convex column and radiating fin, has the gap when making the power supply module fixedly and between the radiator.

Further; Be formed with first connecting portion and second connecting portion on the outer surface of said cover plate; Said first connecting portion is used to connect Chinese style Down lamp fixed fastener; Said second connecting portion is used to connect fixedly torsion spring of American Down lamp, said LED Down lamp have said Chinese style Down lamp fixed fastener and American Down lamp fixedly torsion spring the two one of.

Further, said LED illuminating module comprises an integrated LED light source, has the groove that cooperates with this integrated LED light source on the inner surface of said cover plate.

Further; Said LED illuminating module also comprises a circuit board; This circuit board is located at the side of integrated LED light source away from cover plate; Said circuit board and cover plate fix integrated LED light source are clamped between circuit board and the cover plate, have the light hole of corresponding said integrated LED light source on the said circuit board.

Further, said LED Down lamp also comprises a reflector, and this reflector has a planar annular away from an end of cover plate, and this planar annular is fixed on the step surface of said cylindrical shell.

Further, be formed with the annular protrusion that engages with said annular groove on the planar annular of said reflector.

Further; Said LED Down lamp also comprises is located at the lampshade of said reflector away from cover plate one side; Have a plurality of hollow double-screw bolts on this lampshade corresponding to a plurality of fixing holes on the said step surface towards said step surface; Through the hollow double-screw bolt is inserted in the said fixing hole, and lock the planar annular that screw and said hollow double-screw bolt be spirally connected said reflector from the other end of fixing hole and be clamped between lampshade and the step surface.

Further, corresponding said a plurality of hollow double-screw bolts offer a plurality of fixing holes or a plurality of breach on the planar annular of said reflector.

Further; Said LED illuminating module comprises a circuit board and is arranged at a plurality of LED lamp pearls on this circuit board; Said LED Down lamp also comprises a lens board; This lens board is fixed on the said step surface, is formed with on this lens board and the corresponding lens of said a plurality of LED lamp pearls, to control the light direction of each LED lamp pearl.

Further, be formed with annular groove on the said step surface, be formed with the annular protrusion that engages with said annular groove on the said lens board.

Further, the corresponding said a plurality of hollow double-screw bolts in the edge of said lens board offer a plurality of fixing holes or a plurality of breach.

Further, said LED Down lamp also comprises a retainer ring of being located at said lens board away from LED illuminating module one side, and this retainer ring is fixed in said step surface, so that lens board is clamped between retainer ring and the step surface.

Compared with prior art, be formed with annular groove and a plurality of fixing hole on the step surface of the lamp body of the LED Down lamp of the utility model.Said annular groove can cooperate with the reflector of corresponding integrated LED light source, also can cooperate with the lens board of corresponding traditional LED lamp plate; Said fixing hole can cooperate with the lampshade of corresponding integrated LED light source, also can cooperate with the retainer ring of corresponding traditional LED lamp plate.That is, the lamp body of said LED Down lamp promptly can be applicable to traditional LED lamp plate, can be applicable to integrated LED light source again, has very strong versatility and matching.In addition, because said lamp body has very strong matching, make that lamp body manufacturer need not to adopt two cover different dies to traditional LED lamp plate and integrated LED light source, thereby can reduce the die sinking cost of lamp body manufacturer greatly.

Above-mentioned explanation only is the general introduction of the utility model technical scheme; In order more to know the technological means of understanding the utility model; And can implement according to the content of specification, and for let the above-mentioned of the utility model with other purpose, feature and advantage can be more obviously understandable, below special act embodiment; And conjunction with figs., specify as follows.

Description of drawings

Below in conjunction with accompanying drawing the embodiment of the utility model is described, wherein:

Fig. 1 is the three-dimensional exploded view of a kind of LED Down lamp of providing of the utility model first embodiment;

Fig. 2 is the side view after the assembling of LED Down lamp among Fig. 1;

Fig. 3 is the schematic perspective view of the lamp body of LED Down lamp among Fig. 1;

Fig. 4 is the upward view of the lamp body among Fig. 3;

Fig. 5 is the cutaway view of the LED Down lamp among Fig. 2; And

Fig. 6 is the three-dimensional exploded view of a kind of LED Down lamp of providing of the utility model second embodiment.

The specific embodiment

Below be further elaborated based on the specific embodiment of accompanying drawing to the utility model.Should be appreciated that specific embodiment described herein as just embodiment, and be not used in the protection domain that limits the utility model.

See also Fig. 1 and Fig. 2, the LED Down lamp 100 that the utility model first embodiment provides comprises lamp body 10, power supply module 20, LED illuminating module 30, reflector 40 and lampshade 50.

Please further consult Fig. 3 and Fig. 4, said lamp body 10 comprises cylindrical shell 11, cover plate 12 and radiator 13.In the present embodiment, said lamp body 10 is formed in one, and so, the heat that LED illuminating module 30 produces can distribute through cylindrical shell 11, cover plate 12 and the radiator 13 of lamp body 10, improves the radiating efficiency of LED Down lamp 100 greatly, also provides cost savings simultaneously.Said lamp body 10 has the metal of good heat dispersion performance to process usually, and in the present embodiment, said lamp body 10 is processed by aluminium alloy.

Said cylindrical shell 11 1 end openings, the other end is covered with said cover plate 12.Said cylindrical shell 11 comprises first portion 111 being connected with said cover plate 12, be connected in said first portion 111 away from second portion 112 of cover plate 12 1 ends and the annular lip 113 of radially extending outward along cylindrical shell 11 away from an end of first portion 111 from second portion 112.Have an inclination angle between the central shaft of the inner surface of said first portion 111 and cylindrical shell 11, make the portion 111 that wins near the internal diameter of cover plate 12 1 ends smaller or equal to internal diameter away from cover plate 12 1 ends, be convenient to assembling and processing.Concrete, said inclination angle can be smaller or equal to 10 degree, thereby make the said portion 111 that wins that makes be more or less the same near the internal diameter of cover plate 12 1 ends and internal diameter away from cover plate 12 1 ends.In the present embodiment, said inclination angle is smaller or equal to 5 degree.Be formed with a step surface 114 between the inner surface of said first portion 111 and second portion 112 towards the opening direction of cylindrical shell 11.Have an annular groove 114a and a plurality of fixing hole 114b on this step surface 114.In the present embodiment, said a plurality of fixing hole 114b are located among the said annular groove 114a.Be appreciated that said fixing hole 114b is not limited to be arranged among the annular groove 114a, for example, it is first-class that said fixing hole 114b also can be arranged at the inboard step surface 114 of annular groove 114a.

The inner surface of said cover plate 12 is used to install said LED illuminating module 30.Said radiator 13 is formed at the outer surface of said cover plate 12, and said radiator 13 comprises projection 131 that corresponding LED illuminating module 30 is provided with and is arranged on a plurality of radiating fins 132 on the outer surface of said cover plate 12 around said projection 131.Be the material of saving radiator 13 and the area of dissipation that increases lamp body 10; Preferably; Said projection 131 is a hollow convex column, and in the present embodiment, said projection 131 inside further are provided with ribs 133; This ribs 133 can further increase the thermocontact area between radiator 13 and the cover plate 12, and can prevent that projection 131 is out of shape because of stressed.Concrete, said ribs 133 can be cross, M shape etc., and in the present embodiment, said ribs 133 is a cross.

The all radially extensions along cylindrical shell 11 of said each radiating fin 132 from the outer surface of projection 131.Preferably, said each radiating fin 132 all extends along the radially upper curve of cylindrical shell 11, so, can increase the area of dissipation of radiating fin 132.Said a plurality of radiating fin 132 can be located on the same plane away from an end of cover plate 12, so that reduce manufacturing cost and said power supply module 20 is installed.In another embodiment, the height of said each radiating fin 132 radially increases along cylindrical shell 11 gradually, and forms to the space that cover plate 12 caves inward cross-ventilation when being beneficial to dispel the heat at radiator 13 middle parts.For further increasing the area of dissipation of radiating fin 132; Said each radiating fin 132 can further extend to the outer surface of first portion 111 of cylindrical shell 11; Be appreciated that; In other embodiments, said each radiating fin 132 also can further extend to outer surface and the outer surface of annular lip 113 of second portion 112 of cylindrical shell 11, to increase the area of dissipation of radiating fin 132.Said each radiating fin 132 is equal basically at the thickness of sustained height; Thickness along near said cylindrical shell 11 directions then increases gradually, so, can increase the thermocontact area of radiating fin 132 and cylindrical shell 11 on the one hand; On the other hand, increase the contact area of radiating fin 132 and air.

Said power supply module 20 is fixed in the side of said radiator 13 away from cover plate 12.Be formed with the fixed leg 121 that is used for fixing power supply module 20 on the outer surface of said cover plate 12; The height of said fixed leg 121 is higher than the height of projection 131 and radiating fin 132; Has the gap when making power supply module 20 fixedly and between the radiator 13, so that air communication comes to improve the thermal convection current between radiator 13 and the air.In the present embodiment, the quantity of said fixed leg 121 is two, and the quantity that is appreciated that said fixed leg 121 is not limited to two of present embodiment, and its quantity can also be three, four etc.For ease of said power supply module 20 is 30 power supplies of LED illuminating module; Can be formed with the through hole that is communicated with said hollow convex column 131 on the said cover plate 12, said power supply module 20 is 30 power supplies of LED illuminating module through the electric wire (figure does not show) that runs through said hollow convex column 131 and said through hole.

In the present embodiment, said LED illuminating module 30 is for comprising an integrated LED light source 31 and a circuit board 32.Said integrated LED light source 31 has a light-emitting zone, this light-emitting zone is integrated plurality of LEDs.Have the groove 122 that cooperates with this integrated LED light source 31 on the inner surface of said cover plate 12, said integrated LED light source 31 can be attached at the bottom of this groove 122.Said circuit board 32 is located at the side of integrated LED light source 31 away from cover plate 12; Said circuit board 32 and cover plate 12 fix integrated LED light source 31 are clamped between circuit board 32 and the cover plate 12, have the light hole 321 of corresponding said integrated LED light source 31 light-emitting zones on the said circuit board 32.In the present embodiment, the edge of said circuit board 32 offers a plurality of fixing holes 322, and employing screw etc. passes said fixing hole 322 and can circuit board 32 be fixed on the cover plate 12.Because said integrated LED light source 31 fixes on the inner surface of cover plate 12 through circuit board 32, therefore, can avoid on integrated LED light source 31, being provided with fixture such as screw influences the bright dipping light efficiency; Because the area of circuit board 32 is bigger; Fixing hole 322 is when being screwed, and this screw is just between reflector 40 and first portion 111, and is far away apart from light-emitting zone; The light that integrated LED light source 31 is sent impacts less, thereby improves light efficiency.In addition, also can avoid on integrated LED light source 31, being provided with screw etc. influences the setting of reflector 40 or influences cooperating of said reflector 40 and said integrated LED light source 31.

Please a progress consult Fig. 5, said reflector 40 is fastened in the lamp body 10 and covers on around the integrated LED light source 31.Particularly, reflector 40 can be that the mode through buckle is fixed in the lamp body 10, and perhaps the mode through screw lock is fixed in the lamp body 10, so reflector 40 can change according to real needs.The structure of reflector 40 is according to the difference of integrated LED light source 31 and difference.Because reflector 40 is for being fixed to separably in the lamp body 10, so the material of reflector 40 does not receive the materials limitations of lamp body 10, for saving cost and the weight that alleviates LED Down lamp 100, the material of reflector 40 can be selected plastics for use.In addition, reflector 40 can be the reflector with any reflective angle, thereby can lead to the rising angle that the reflective angle of selecting reflector is controlled Down lamp 100, and usually, said rising angle comprises 45 degree, 60 degree, 90 degree etc.Because reflector 40 is to be fixed to separably on the lamp body 10, so, through the reflector 40 of changing different reflective angles, can adopt same lamp body 10 and realize a plurality of rising angles.

In the present embodiment, said reflector 40 has a planar annular 41 away from an end of cover plate 12, and this planar annular 41 is fixed on the step surface 114 of said cylindrical shell 11.Be formed with on the said reflector 40 with said step surface 114 on the annular protrusion 42 that fastens of annular groove 114a.Be appreciated that the mode that said annular groove 114a engages with annular protrusion 42, sealing is better.A plurality of fixing hole 114b on the corresponding said step surface 114, said reflector 40 edges are formed with a plurality of breach 43.Be appreciated that said reflector 40 can form the through hole corresponding with fixing hole 114b if said fixing hole 114b is positioned on the inboard step surface 114 of annular groove 114a.

See also Fig. 1; Said lampshade 50 is located at reflector 40 away from cover plate 12 1 sides; Have a plurality of hollow double-screw bolts 51 on this lampshade 50 towards said step surface 114; Said a plurality of hollow double-screw bolt 51 can insert among a plurality of fixing hole 114b on the said step surface 114, is spirally connected and can the planar annular 41 of said reflector 40 be clamped between lampshade 50 and the step surface 114 through lock screw and said hollow double-screw bolt 51 from the other end of fixing hole 114b.The inner surface of said hollow double-screw bolt 51 can be provided with screw thread, also screw thread can be set.In the present embodiment; See for saving the die sinking cost; In said hollow double-screw bolt 51 inner surfaces screw thread is not set, but a smooth surface, at this moment; Can adopt tapping screw to lock the mode of said hollow double-screw bolt 51, the planar annular 41 of said reflector 40 is clamped between lampshade 50 and the step surface 114.

Said LED Down lamp 100 also can comprise fixedly torsion spring 70 of a plurality of Chinese style Down lamp fixed fasteners 60 or a plurality of American Down lamp.Corresponding said fixed fastener 60 and fixing torsion spring 70 are formed with a plurality of first connecting portions 123 and a plurality of second connecting portions 124 on the outer surface of said cover plate 12, be respectively applied for to connect said fixed fastener 60 and fixing torsion spring 70.Said American Down lamp fixedly torsion spring 70 is the Down lamp fixed forms that are applicable to American market, and said Chinese style Down lamp fixed fastener 60 is the Down lamp fixed forms that are applicable to markets such as China.Owing to be formed with a plurality of first connecting portions 123 and a plurality of second connecting portions 124 on the outer surface of the cover plate 12 of said LED Down lamp 100, thereby can be so that LED Down lamp 100, has the versatility of height applicable to markets such as the U.S., China.

See also Fig. 6; LED Down lamp that the utility model second embodiment provides 200 is basic identical with the structure of the LED Down lamp 100 that the utility model first embodiment provides, and said LED Down lamp 200 is with the difference of LED Down lamp 100: said LED Down lamp 200 have with LED Down lamp 100 in different LED illuminating module 230, be used for the lens board 240 of LED illuminating module 230 leaded lights and the retainer ring 250 that is used for fixing lens board 240.

Said LED illuminating module 230 comprises a circuit board 231 and is arranged at a plurality of LED lamp pearls 232 on this circuit board 231.Said circuit board 231 specifically can comprise an aluminium base, is formed on the lip-deep insulating barrier of aluminium base and is positioned at the circuit layer on the insulating barrier that said LED lamp pearl 232 is arranged on the said circuit layer, and is electrically connected with circuit layer.Said circuit board 231 can be fixed on the lamp body 10 through screw.

Be formed with the lens 241 corresponding with said a plurality of LED lamp pearl 232 on the said lens board 240, said lens board 240 is fixed on the step surface 114 of lamp body 10.Said lens 241 are used to control the light direction of each LED lamp pearl 232, make light that each LED lamp pearl 232 sent derive as far as possible and towards with subscriber to emission.Similar with said reflector 40, the annular groove 114a (see figure 4) of said lens board 240 on can corresponding step surface 114 forms the annular protrusion that engages with it.

Said retainer ring 250 is located at said lens board 240 away from LED illuminating module 230 1 sides.Similar with lampshade 50, have hollow double-screw bolt 251 on this retainer ring 250, be used for retainer ring 250 is fixed in said step surface 114, so that lens board 240 is clamped between retainer ring 250 and the step surface 114.

The corresponding said a plurality of hollow double-screw bolts 251 in said lens board 240 edges offer a plurality of fixing holes or a plurality of breach (scheming not shown).

Be appreciated that; In order to improve the versatility of lamp body 10; Promptly can either be used for fixing the LED illuminating module 30 of the utility model first embodiment; Also can be used for fixing the LED illuminating module 230 of the utility model second embodiment, the inner surface of the cover plate 12 of said lamp body 10 can be provided with two groups of fixing holes simultaneously, is respectively applied for fixed L ED illuminating module 30 and LED illuminating module 230.The inner surface that is appreciated that the cover plate 12 of said lamp body 10 also can only be provided with one group of fixing hole, but both fixed L ED illuminating module 30 of this group fixing hole, but also fixed L ED illuminating module 230.

Compared with prior art, in the lamp body 10 of the LED Down lamp 100 of the utility model, projection 131 is provided with corresponding to the position of LED illuminating module 30, the heat that ability fast Absorption LED illuminating module 30 produces.Radiating fin 132 is connected with cover plate 12, can accelerated heat shift to radiating fin 132 from cover plate 12.Radiating fin 132 is connected with projection 131, can heat be transferred on the radiating fin 132 from the heat concentrated area of LED illuminating module 30 fast.Thereby can the heat that LED illuminating module 30 produces be distributed quickly, improve the radiating efficiency of LED Down lamp 100.

The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.

Claims

1. the lamp body of a LED Down lamp; It comprises cylindrical shell, cover plate and radiator; Said cylindrical shell one end opening, the other end is covered with said cover plate, and said radiator is formed at the outer surface of said cover plate; It is characterized in that; Said cylindrical shell comprises first portion that is connected with said cover plate and is connected in the second tin portion of said first portion away from cover plate one end, is formed with a step surface towards the opening direction of cylindrical shell between the inner surface of said first portion and second portion, is formed with annular groove and a plurality of fixing hole on the said step surface.

2. lamp body as claimed in claim 1 is characterized in that, has an inclination angle between the inner surface of said first portion and the central shaft of cylindrical shell, and said inclination angle is smaller or equal to 10 degree.

3. LED Down lamp, it comprises like each the described lamp body of claim 1-3 and the LED illuminating module of inner surface that is arranged at the cover plate of said lamp body.

4. LED Down lamp as claimed in claim 3; It is characterized in that; Said LED illuminating module comprises an integrated LED light source, and said LED Down lamp also comprises a reflector, and this reflector has a planar annular away from an end of cover plate; This planar annular is fixed on the step surface of said cylindrical shell, is formed with the annular protrusion that engages with said annular groove on the planar annular of said reflector.

5. LED Down lamp as claimed in claim 4; It is characterized in that; Said LED Down lamp also comprises is located at the lampshade of said reflector away from cover plate one side; Have on this lampshade towards said step surface and the hollow double-screw bolt corresponding, through the hollow double-screw bolt is inserted in the said fixing hole, and lock the planar annular that screw and said hollow double-screw bolt be spirally connected said reflector from the other end of fixing hole and be clamped between lampshade and the step surface with said fixing hole.

6. LED Down lamp as claimed in claim 5 is characterized in that, the corresponding said a plurality of hollow double-screw bolts of the planar annular of said reflector offer a plurality of fixing holes or a plurality of breach.

7. LED Down lamp as claimed in claim 4; It is characterized in that; Said LED illuminating module also comprises a circuit board; This circuit board is located at the side of integrated LED light source away from cover plate, and said circuit board and cover plate fix integrated LED light source is clamped between circuit board and the cover plate, have the light hole of corresponding said integrated LED light source on the said circuit board.

8. LED Down lamp as claimed in claim 3; It is characterized in that said LED illuminating module comprises a circuit board and be arranged at a plurality of LED lamp pearls on this circuit board that said LED Down lamp also comprises a lens board; This lens board is fixed on the said step surface; Be formed with on this lens board and the corresponding lens of said a plurality of LED lamp pearls,, be formed with the annular protrusion that engages with said annular groove on the said lens board to control the light direction of each LED lamp pearl.

9. LED Down lamp as claimed in claim 8; It is characterized in that; Said LED Down lamp also comprises a retainer ring of being located at said lens board away from LED illuminating module one side; This retainer ring is fixed in said step surface, and lens board is clamped between retainer ring and the step surface, this retainer ring is towards being provided with of the said step surface hollow double-screw bolt corresponding with said fixing hole; Through the hollow double-screw bolt is inserted in the said fixing hole, and lock screw and said hollow double-screw bolt from the other end of fixing hole and be spirally connected said lens board is clamped between retainer ring and the step surface.

10. LED Down lamp as claimed in claim 9 is characterized in that, the corresponding said a plurality of hollow double-screw bolts in the edge of said lens board offer a plurality of fixing holes or a plurality of breach.