CN207065332U - A kind of telescopic LED down lamp - Google Patents
A kind of telescopic LED down lamp Download PDFInfo
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- CN207065332U CN207065332U CN201720854421.XU CN201720854421U CN207065332U CN 207065332 U CN207065332 U CN 207065332U CN 201720854421 U CN201720854421 U CN 201720854421U CN 207065332 U CN207065332 U CN 207065332U
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- extrusome
- lamp
- led down
- hollow tube
- down lamp
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Abstract
The utility model discloses a kind of telescopic LED down lamp, it includes screw socket and lamp body and extrusome, extrusome is connected between screw socket and lamp body, screwing screw socket, lamp body is outer to extend the length of LED down lamp, and screw socket makes extrusome automatic retracted in lamp body after being screwed with outside lamp socket with stretching out extrusome during outside lamp socket；Advantage is by setting an extrusome between screw socket and lamp body, utilize the flexible adjustable in length for making LED down lamp of extrusome, when LED down lamp is installed, pulled outward screw socket or lamp body using external force, extrusome is pulled out outside lamp body, the length of LED down lamp is thus extended, so as to easily directly be combined on screw socket on the lamp socket being inlaid in sleeve；After screw socket is combined on lamp socket, lamp body is promoted using external force, now extrusome automatic retracted is in lamp body, and installation is simple and convenient, suitable for the sleeve of different caliber sizes.
Description
Technical field
A kind of Down lamp is the utility model is related to, more particularly, to a kind of telescopic LED down lamp.
Background technology
Down lamp is a kind of recessed light fixture, in its general ceiling mounted hole in the sleeve of setting-in.
Traditional Down lamp generally use binding post, the extraction wire of Down lamp is connected with civil power output line during installation
Come.Existing part Down lamp replaces the oriented lamps such as BR lamps because needing, and is screwed using screw socket to the lamp being installed in sleeve
Mode on seat electrically connects with city, and this Down lamp is typically that a screw socket is installed in the extraction wire of traditional Down lamp,
First screw socket is screwed to being installed on the lamp socket in sleeve when mounted, the bullet that then will be installed on the two sides of Down lamp
Spring mounting board is buckled on sleeve, the donut of Down lamp is covered hole in the opening and ceiling of sleeve；But this Down lamp by
Need hand extending into sleeve when installation and screw screw socket to lamp socket, therefore when the bore of sleeve is smaller, installation
It is extremely inconvenient.
The content of the invention
Technical problem to be solved in the utility model is to provide a kind of telescopic LED down lamp, and it utilizes Telescopic,
Can simply and easily it be installed in the sleeve of different caliber sizes.
Technical scheme is used by the utility model solves above-mentioned technical problem：A kind of telescopic LED down lamp, including
Screw socket and lamp body, it is characterised in that：Also include extrusome, described extrusome be connected to described screw socket with it is described
Lamp body between, it is outer to extend with making described extrusome stretch out described lamp body during outside lamp socket to screw described screw socket
The length of LED down lamp, described screw socket make described extrusome automatic retracted in described lamp after being screwed with outside lamp socket
In vivo.
Described lamp body includes lamp housing, and described lamp housing is hollow and tubular neck portions and flare by being wholely set form,
Extended internally on the top port of described tubular neck portions and be provided with annular block machine, described extrusome is by hollow tube, one
The necking spout part being arranged on the top of described hollow tube, the expansion being integrally formed on the bottom of described hollow tube
Oral pillar shape platform forms, and is provided with described necking spout part for the screw-internal thread fit with being set in described screw socket
External screw thread, can directly be combined on necking spout part in screw socket, the external diameter of described hollow tube is slightly less than described
Annular block machine endoporus aperture, the external diameter of described enlarging cylindricality platform is slightly less than the internal diameter of described tubular neck portions and is more than
The endoporus aperture of described annular block machine, it is provided between described hollow tube and described annular block machine described for ensureing
Extrusome can only along the guiding mechanism of the axial linear movement of described tubular neck portions, described enlarging cylindricality platform with it is described
Tubular neck portions between be provided with for making described extrusome be positioned in described tubular neck portions so that described extrusome
The detent mechanism stretched out outside described lamp housing, is provided with that can to bounce back to described extrusome described on described hollow tube
Tubular neck portions in cam mechanism.Here, guiding mechanism, detent mechanism and cam mechanism are used cooperatively, can realize pair
The adjustment of the length of LED down lamp, so as to which LED down lamp to be easily installed on to the lamp socket in the sleeve of various different caliber sizes
On.
Described guiding mechanism includes circumferentially arranged linear in multiple guiding on the periphery wall of described hollow tube
Vertical groove and circumferentially arranged in multiple guiding linear vertical boss on the internal perisporium of described annular block machine, described leads
Bottom is extended to linear vertical groove from the top of described hollow tube, described guiding linear vertical boss corresponds
In the embedded described linear vertical groove of guiding, and can in the described linear vertical groove of guiding linear vertical motion.It is this
The guiding mechanism of structure is simple in construction, and can ensure that extrusome can only move along the axial linear of tubular neck portions, that is, ensure that
Stability when extrusome is drawn out or bounced back.
Described detent mechanism includes circumferentially arranged in the positioning annular on the periphery wall of described enlarging cylindricality platform
Groove and circumferentially arranged multiple positioning convex tendons in described tubular neck portions on the position of described annular block machine, it is described
Positioning convex tendon and described positioning annular groove radial section it is curved, multiple described positioning convex tendons insertions are described to be determined
The described extrusome of the interior realization of position annular groove is located by connecting with described tubular neck portions, and multiple described positioning convex tendons depart from
Described extrusome retraction after described positioning annular groove.The detent mechanism of this structure is simple in construction, and positioning convex tendon is embedding
When being located by connecting for extrusome and tubular neck portions is can be achieved with after entering to position in annular groove, and applying external force and promotes lamp body, by
It is curved in the radial section of positioning convex tendon and positioning annular groove, therefore positioning convex tendon easily slides out positioning under external force
Annular groove makes extrusome bounce back.
Described cam mechanism includes spring, and described spring housing is located at outside described hollow tube, described spring
One end is fixed on the bottom of described hollow tube, and described spring is limited to described enlarging cylindricality platform and described ring
Between shape block machine, rear described spring is located at institute by compression in the described positioning annular groove of multiple described positioning convex tendon insertions
In space between the annular block machine and described positioning convex tendon stated, multiple described positioning convex tendons depart from described positioning annular
Described spring restores under natural resiliency effect after groove.In actual design, according to extrusome stretch out lamp housing outside or spring
The firmly situation of elastical retraction, the elasticity of spring or the length of spring can be adjusted, the length of spring can such as be set
It is set to 2 times of the axial length of hollow tube；When extrusome stretches out tubular neck portions, spring is compressed, until multiple convexes
Extrusome is located by connecting with tubular neck portions after in muscle insertion positioning annular groove；After screw socket is bolted on lamp socket, pass through
Apply external force and promote lamp body, positioning convex tendon skids off positioning annular groove, spring elongation, extrusome retracted into tubular neck portions
In inner chamber.
A through hole is provided with the bottom of described hollow tube, one end of described spring is bent to form hook part, institute
The hook part stated is stretched into described through hole and caught on.By setting a through hole on the bottom of hollow tube, and by spring
One end is bent to form hook part, so one end of spring easily can be fixed on into hollow tube using the cooperation of hook part and through hole
Bottom on.
Described lamp body also includes driving power, cup type radiator, LED light source board and diffuser, described driving power
It is fixed on vertically in the inner chamber of described extrusome by irrigating heat-conducting glue, described cup type radiator is fixed on described loudspeaker
In the inner chamber in portion, described LED light source board is fixed in the inner chamber of described cup type radiator, and described driving power is led to respectively
Cross wire to be connected with described LED light source board and described screw socket, described diffuser is connected to described flare
On wide mouth end.Here, driving power is fixed in the inner chamber of extrusome vertically by irrigating heat-conducting glue, therefore the straight line of extrusome
Motion does not interfere with the performance of driving power.
It is circumferentially arranged on the internal perisporium of described flare to have multiple vertically-mounted posts, set on described cup type radiator
Be equipped with the described one-to-one mounting hole of vertically-mounted post, utilize screw and described mounting hole and described vertically-mounted
The cooperation of post realizes that described cup type radiator is installed on described vertically-mounted post.Matched somebody with somebody using mounting hole and vertically-mounted post
Closing screw easily can be installed on cup type radiator in lamp housing.
It is outwards horizontal-extending on the wide mouth end of described flare to be provided with donut.After LED down lamp is installed on lamp socket,
Donut covers the hole on the nozzle and ceiling of sleeve.
Compared with prior art, the utility model has the advantage of：By setting one between screw socket and lamp body
Extrusome, using the flexible adjustable in length for making LED down lamp of extrusome, when LED down lamp is installed, pulled outward screw socket using external force
Lamp holder or lamp body, extrusome is pulled out outside lamp body, the length of LED down lamp is thus extended, so as to easily by screw lamp
Head is directly combined on the lamp socket being inlaid in sleeve；After screw socket is combined on lamp socket, lamp body is promoted using external force, now
Extrusome automatic retracted is in lamp body, and installation is simple and convenient, suitable for the sleeve of different caliber sizes.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the telescopic LED down lamp (extrusome retracted state) of embodiment one；
Fig. 2 is the overall structure diagram of the telescopic LED down lamp (extrusome pull-out state) of embodiment one；
Fig. 3 is the cross section structure diagram of the telescopic LED down lamp (extrusome pull-out state) of embodiment one；
Fig. 4 is the decomposition texture schematic diagram of the telescopic LED down lamp of embodiment one；
Fig. 5 is the perspective view of the lamp housing in the telescopic LED down lamp of embodiment one；
Fig. 6 is the sectional view of the lamp housing in the telescopic LED down lamp of embodiment one；
Fig. 7 is the structural representation of the extrusome in the telescopic LED down lamp of embodiment two；
Fig. 8 is the structural representation of the spring in the telescopic LED down lamp of embodiment two；
Fig. 9 is the schematic diagram after telescopic LED down lamp (extrusome pull-out state) is installed on the lamp socket in sleeve；
Figure 10 is the schematic diagram after telescopic LED down lamp (extrusome retracted state) is installed on the lamp socket in sleeve.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing embodiment.
Embodiment one：
A kind of telescopic LED down lamp that the present embodiment proposes, it includes screw socket 1, lamp body 2 and extrusome 3, stretches
Body 3 is connected between screw socket 1 and lamp body 2, screws screw socket 1 with making extrusome 3 stretch out outside lamp body 2 during outside lamp socket 91
To extend the length of LED down lamp, screw socket 1 makes the automatic retracted of extrusome 3 in lamp body 2 after being screwed with outside lamp socket 91.It is logical
One extrusome 3 of setting between screw socket 1 and lamp body 2 is crossed, utilizes the flexible adjustable length for making LED down lamp of extrusome 3
It is whole, when LED down lamp is installed, is pulled outward screw socket 1 or lamp body 2 using external force, extrusome 3 is pulled out outside lamp body 2, thus prolonged
The length of LED down lamp is grown, so as to which easily screw socket 1 is directly combined on the lamp socket 91 being inlaid in sleeve 92；
After screw socket 1 is combined on lamp socket 91, lamp body 2 is promoted using external force, now the automatic retracted of extrusome 3 is installed in lamp body 2
It is simple and convenient, suitable for the sleeve of different caliber sizes.
In this particular embodiment, lamp body 2 includes lamp housing 21, driving power 22, cup type radiator 23, LED light source board 24
With diffuser 25, lamp housing 21 is hollow and tubular neck portions 26 and flare 27 by being wholely set form, the top of tubular neck portions 26
Extended internally on port and be provided with annular block machine 28, driving power 22 is fixed in extrusome 3 vertically by irrigating heat-conducting glue
In chamber, the linear motion of extrusome 3 does not interfere with the performance of driving power 22, and cup type radiator 23 is fixed on the interior of flare 27
In chamber, LED light source board 24 is fixed in the inner chamber of cup type radiator 23, and driving power 22 passes through wire and LED light source board respectively
24 and screw socket 1 connect, diffuser 25 is connected on the wide mouth end of flare 27, outwards horizontal on the wide mouth end of flare 27
Being extended has donut 29, and after LED down lamp is installed on lamp socket 91, donut 29 is covered on the nozzle and ceiling of sleeve 92
Hole；Extrusome 3 by hollow tube 31, the necking spout part 32 being integrally formed on the top of hollow tube 31, be wholely set
Formed in the enlarging cylindricality platform 33 on the bottom of hollow tube 31, be provided with and be used for and screw socket 1 on necking spout part 32
The external screw thread 321 that the internal thread 11 of interior setting coordinates, can directly it be combined on necking spout part 32 in screw socket 1, it is hollow
The external diameter of body 31 is slightly less than the endoporus aperture of annular block machine 28, and the external diameter of enlarging cylindricality platform 33 is slightly less than tubular neck portions 26
Internal diameter and the endoporus aperture for being more than annular block machine 28, are provided between hollow tube 31 and annular block machine 28 for ensureing extrusome
3 can only be set along the guiding mechanism of the axial linear movement of tubular neck portions 26 between enlarging cylindricality platform 33 and tubular neck portions 26
Have for making extrusome 3 be positioned in tubular neck portions 26 so that the detent mechanism that extrusome 3 is stretched out outside lamp housing 21, hollow tube 31
On be provided with the cam mechanism that extrusome 3 can be made to bounce back in tubular neck portions 26.Here, guiding mechanism, detent mechanism and return
Contracting mechanism is used cooperatively, and can realize the adjustment to the length of LED down lamp, so as to easily be installed on LED down lamp respectively
On lamp socket in the sleeve of the different caliber sizes of kind.
In this particular embodiment, four vertically-mounted posts 271 are circumferentially evenly arranged with the internal perisporium of flare 27,
Be provided with cup type radiator 23 with the one-to-one mounting hole 231 of vertically-mounted post 271, using screw and mounting hole 231 and
The cooperation of vertically-mounted post 271 realizes that cup type radiator 23 is installed on vertically-mounted post 271.Using mounting hole 231 and vertically
Cup type radiator 23 easily can be installed in lamp housing 21 by the attachment screw of mounting post 271.
In this particular embodiment, guiding mechanism includes circumferentially arranged four on the periphery wall of hollow tube 31 and led
To linear vertical groove 311 and it is circumferentially arranged be oriented to linear vertical boss 281 in four on the internal perisporium of annular block machine 28,
It is oriented to linear vertical groove 311 and extends to bottom from the top of hollow tube 31, guiding linear vertical boss 281 corresponds embedding
Enter to be oriented in linear vertical groove 311, and linear vertical motion in linear vertical groove 311 can be oriented to.This structure is led
It is simple to mechanism structure, and can ensure that extrusome 3 can only move along the axial linear of tubular neck portions 26, that is, it ensure that extrusome
3 stability when being drawn out or bouncing back.
In this particular embodiment, detent mechanism is determined including circumferentially arranged on the periphery wall of enlarging cylindricality platform 33
Position annular groove 331 and circumferentially arranged four positioning convex tendons 261 in tubular neck portions 26 on the position of annular block machine 28,
The radial section of positioning convex tendon 261 and positioning annular groove 331 is curved, four insertion positioning annular grooves of positioning convex tendon 261
Realize that being located by connecting for extrusome 3 and tubular neck portions 26, four positioning convex tendons 261 are stretched after departing from positioning annular grooves 331 in 331
Contracting body 3 bounces back.The detent mechanism of this structure is simple in construction, and positioning convex tendon 261 is embedded in after positioning in annular groove 331 with regard to energy
When realizing being located by connecting for extrusome 3 and tubular neck portions 26, and applying external force and promote lamp body 2, due to positioning convex tendon 261 and positioning
The radial section of annular groove 331 is curved, therefore positioning convex tendon 261 easily slides out positioning annular groove under external force
331 make extrusome 3 bounce back.
In this particular embodiment, cam mechanism includes spring 34, and spring 34 is sheathed on outside hollow tube 31, spring 34
One end is fixed on the bottom of hollow tube 31, and spring 34 is limited between enlarging cylindricality platform 33 and annular block machine 28, four
Spring 34 is compressed between annular block machine 28 and positioning convex tendon 261 after in the insertion positioning annular groove 331 of positioning convex tendon 261
Space in, spring 34 restores under natural resiliency effect after four positioning convex tendons 261 depart from positioning annular grooves 331.In reality
When border is designed, stretch out that lamp housing 21 is outer or the firmly situation of the elastical retraction of spring 34 according to extrusome 3, can be to the elasticity of spring 34
Or the length of spring 34 is adjusted, the length of spring 34 can be such as arranged to 2 times of the axial length of hollow tube 31；When
When extrusome 3 stretches out tubular neck portions 26, spring 34 is compressed, until in four insertion positioning annular grooves 331 of positioning convex tendon 261
Extrusome 3 is located by connecting with tubular neck portions 26 afterwards；After screw socket 1 is bolted on lamp socket 91, lamp is promoted by applying external force
Body 2, positioning convex tendon 261 skid off positioning annular groove 331, the elastic elongation of spring 34, extrusome 3 retracted in tubular neck portions 26
In chamber.
Embodiment two：
A kind of telescopic LED down lamp that the present embodiment proposes, it is the telescopic LED down lamp provided in embodiment one
On the basis of improved, i.e., a through hole 312, one end bent of spring 34 are provided with the bottom of hollow tube 31
Into hook part 341, hook part 341 is stretched into through hole 312 and caught on.By setting a through hole 312 on the bottom of hollow tube 31,
And one end of spring 34 is bent to form hook part 341, so can be easily by bullet using the cooperation of hook part 341 and through hole 312
One end of spring 34 is fixed on the bottom of hollow tube 31.
Claims (9)
1. a kind of telescopic LED down lamp, including screw socket and lamp body, it is characterised in that：Also include extrusome, described stretches
Contracting body is connected between described screw socket and described lamp body, is made when screwing described screw socket and outside lamp socket described
Extrusome stretch out that described lamp body is outer to extend the length of LED down lamp, and described screw socket makes after being screwed with outside lamp socket
Described extrusome automatic retracted is in described lamp body.
A kind of 2. telescopic LED down lamp according to claim 1, it is characterised in that：Described lamp body includes lamp housing, institute
The lamp housing stated is hollow and tubular neck portions and flare by being wholely set form, on the top port of described tubular neck portions inwardly
Being extended has an annular block machine, described extrusome by hollow tube, be integrally formed on the top of described hollow tube
Necking spout part, the enlarging cylindricality platform composition being integrally formed on the bottom of described hollow tube, the described necking mouth of pipe
The external screw thread for the screw-internal thread fit with being set in described screw socket, the external diameter of described hollow tube are provided with portion
Less than the endoporus aperture of described annular block machine, the external diameter of described enlarging cylindricality platform is less than the internal diameter of described tubular neck portions
And more than the endoporus aperture of described annular block machine, it is provided between described hollow tube and described annular block machine for protecting
The described extrusome of card can only be along the guiding mechanism of the axial linear movement of described tubular neck portions, described enlarging cylindricality platform
It is provided between described tubular neck portions for making described extrusome be positioned in described tubular neck portions so that described
The detent mechanism that extrusome is stretched out outside described lamp housing, being provided with described hollow tube can make described extrusome bounce back
Cam mechanism in described tubular neck portions.
A kind of 3. telescopic LED down lamp according to claim 2, it is characterised in that：Described guiding mechanism includes edge
The circumferentially disposed linear vertical groove of multiple guiding on the periphery wall of described hollow tube and circumferentially arranged in described
Multiple guiding linear vertical boss on the internal perisporium of annular block machine, described is oriented to linear vertical groove from described hollow tube
The top of body extends to bottom, and the described linear vertical boss that is oriented to corresponds the embedded described linear vertical groove of guiding
It is interior, and can in the described linear vertical groove of guiding linear vertical motion.
A kind of 4. telescopic LED down lamp according to Claims 2 or 3, it is characterised in that：Described detent mechanism includes
It is circumferentially arranged in the positioning annular groove and circumferentially arranged in described pipe on the periphery wall of described enlarging cylindricality platform
Multiple positioning convex tendons of the shape neck on the position of described annular block machine, described positioning convex tendon and described positioning annular
The radial section of groove is curved, and described stretch is realized in the positioning annular groove described in multiple described positioning convex tendon insertions
Body is located by connecting with described tubular neck portions, described in after the described positioning annular groove of multiple described positioning convex tendons disengagings
Extrusome bounces back.
A kind of 5. telescopic LED down lamp according to claim 4, it is characterised in that：Described cam mechanism includes bullet
Spring, for described spring housing outside described hollow tube, the bottom of described hollow tube is fixed in one end of described spring
On end, described spring is limited between described enlarging cylindricality platform and described annular block machine, multiple described convexes
Spring described in after in the described positioning annular groove of muscle insertion is by compression positioned at described annular block machine and described convex
In space between muscle, described spring is in natural resiliency after the described positioning annular groove of multiple described positioning convex tendons disengagings
Effect is lower to restore.
A kind of 6. telescopic LED down lamp according to claim 5, it is characterised in that：The bottom of described hollow tube
On be provided with a through hole, one end of described spring is bent to form hook part, and described hook part is stretched into described through hole and hooked
Firmly.
A kind of 7. telescopic LED down lamp according to claim 2, it is characterised in that：Described lamp body also includes driving
Power supply, cup type radiator, LED light source board and diffuser, described driving power by irrigate heat-conducting glue be fixed on vertically it is described
Extrusome inner chamber in, described cup type radiator is fixed in the inner chamber of described flare, and described LED light source board is consolidated
Due in the inner chamber of described cup type radiator, described driving power passes through wire and described LED light source board and institute respectively
The screw socket connection stated, described diffuser are connected on the wide mouth end of described flare.
A kind of 8. telescopic LED down lamp according to claim 7, it is characterised in that：The internal perisporium of described flare
It is upper it is circumferentially arranged have multiple vertically-mounted posts, be provided with described cup type radiator and a pair of described vertically-mounted post 1
The mounting hole answered, described cup type radiator is realized using the cooperation of screw and described mounting hole and described vertically-mounted post
It is installed on described vertically-mounted post.
A kind of 9. telescopic LED down lamp according to claim 2 or 7 or 8, it is characterised in that：Described flare
It is outwards horizontal-extending on wide mouth end to be provided with donut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720854421.XU CN207065332U (en) | 2017-07-14 | 2017-07-14 | A kind of telescopic LED down lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720854421.XU CN207065332U (en) | 2017-07-14 | 2017-07-14 | A kind of telescopic LED down lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207065332U true CN207065332U (en) | 2018-03-02 |
Family
ID=61511799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720854421.XU Active CN207065332U (en) | 2017-07-14 | 2017-07-14 | A kind of telescopic LED down lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207065332U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107300140A (en) * | 2017-07-14 | 2017-10-27 | 浙江阳光美加照明有限公司 | A kind of telescopic LED down lamp |
| CN108561816A (en) * | 2018-04-17 | 2018-09-21 | 中山市风华稀柠照明设计有限公司 | A kind of ceiling lamp |
| CN110939894A (en) * | 2019-12-11 | 2020-03-31 | 深圳市客亿电子科技有限公司 | Novel down lamp structure |
-
2017
- 2017-07-14 CN CN201720854421.XU patent/CN207065332U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107300140A (en) * | 2017-07-14 | 2017-10-27 | 浙江阳光美加照明有限公司 | A kind of telescopic LED down lamp |
| CN108561816A (en) * | 2018-04-17 | 2018-09-21 | 中山市风华稀柠照明设计有限公司 | A kind of ceiling lamp |
| CN108561816B (en) * | 2018-04-17 | 2019-11-08 | 中山市风华稀柠照明设计有限公司 | A kind of ceiling lamp |
| CN110939894A (en) * | 2019-12-11 | 2020-03-31 | 深圳市客亿电子科技有限公司 | Novel down lamp structure |
| CN110939894B (en) * | 2019-12-11 | 2022-05-13 | 深圳市客亿电子科技有限公司 | Novel down lamp structure |
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