CN102980064A - Insulated high pressure light-emitting diode (LED) lamp bulb - Google Patents
Insulated high pressure light-emitting diode (LED) lamp bulb Download PDFInfo
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- CN102980064A CN102980064A CN2012104573588A CN201210457358A CN102980064A CN 102980064 A CN102980064 A CN 102980064A CN 2012104573588 A CN2012104573588 A CN 2012104573588A CN 201210457358 A CN201210457358 A CN 201210457358A CN 102980064 A CN102980064 A CN 102980064A
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Abstract
The invention provides an insulated high pressure light-emitting diode (LED) lamp bulb which is suitable for the lighting field. The insulated high pressure LED lamp bulb comprises a thermal dissipation main body, a lamp cover and a lamp holder, wherein the lamp cover is used for clamping the port on the top portion of the thermal dissipation main body, the lamp holder is arranged at the bottom end of the thermal dissipation main body, a lamp plate is further arranged in the insulated high pressure LED lamp bulb, a welding disc on the conducting layer of the lamp plate is connected with the lamp holder through conductor wires, thermal dissipation fixed sheets are pasted on the bottom of the lamp plate through heat conduction insulated double faced adhesive tapes, the thermal dissipation fixed sheets are nested into the port on the top portion of the thermal dissipation main body and are contacted with the thermal dissipation main body tightly, decoration sheets are arranged between the outer periphery of the lamp plate and the thermal dissipation fixed sheets and are used for completely and safely insulating the lamp plate and the thermal dissipation fixed sheets. According to the insulated high pressure LED lamp bulb in the technique scheme, not only is a thermal dissipation problem solved, but also a high pressure resistance test is passed by products, and safety performance of the products is ensured.
Description
Technical field
The invention belongs to lighting field, relate in particular to a kind of insulation high-voltage LED bulb.
Background technology
High-voltage LED bulb is a development trend of LED illumination, LED lamp plate in the bulb directly is connected electrically to the voltage of 220 ~ 240V or 100 ~ 120V, because the structural design of high-voltage LED bulb does not use transformer to carry out high voltage to the process of low voltage transition, reduced raw-material use on the structure, accomplish the design aim of " resource-conserving; environmentally friendly ", more met the ERP of European Union Eco-Design command request, can greatly save bulb production cost and cost of transportation on the other hand.But because the high voltage source of directly using, therefore the restriction of the electrical safety standard-required of this type of LED bulb is higher, on the basis that guarantees absolute electric insulation safety, in order to guarantee the luminous light decay that do not cause of LED, the heat that produces when LED is luminous must in time distribute to the external world.
High-voltage LED bulb on the market, in order to pass through the desired 4000V high pressure of electrical safety standard, leakage current 5mA, to continue 1 minute high pressure resistant test, often directly LED lamp plate edge is encased with insulating sleeve, put into again the heat radiation main body, the LED lamp plate comprises conductive layer and heat-radiating substrate, because the relatively poor insulating sleeve of use heat conduction separates between heat-radiating substrate and the heat radiation main body, so the heat that the LED lamp plate distributes can't finely distribute, and reduced life of product.
Summary of the invention
In view of the above problems, the object of the present invention is to provide a kind of insulation high-voltage LED bulb, it is poor to be intended to solve existing high-voltage LED bulb radiating effect, the technical problem that service life is short.
The present invention realizes like this, a kind of insulation high-voltage LED bulb, comprise the heat radiation main body, the lamp holder that blocks the lampshade of described heat radiation main body top port and be located at described heat radiation main body bottom, also be provided with lamp plate in the described insulation high-voltage LED bulb, pad on the described lamp plate conductive layer is wired to described lamp holder, there is the heat radiation stator bottom of described lamp plate by the heat conductive insulating sticking double faced adhesive tape, described heat radiation stator be embedded in the top port of described heat radiation main body and with heat radiation main body close contact, also be provided with the cosmetic sheet that both overall safeties are isolated between the periphery of described lamp plate and the heat radiation stator.
Further, described cosmetic sheet also offers the breach that aligns with the edge of heat radiation stator, and described wire is close to the surface of described lamp plate and is passed described breach and enter on the described lamp holder of being connected internally to of described heat radiation main body.
Further, the contact portion of described wire and described breach, heat radiation main body 1 also is socketed with insulating sleeve.
Further, the middle part of described heat radiation stator is the platform of projection, and periphery is concave surface, and described cosmetic sheet is positioned on the described concave surface, and described platform surface is by the bottom of heat conductive insulating sticking double faced adhesive tape at described lamp plate.
Further, described cosmetic sheet bottom also is provided with claw, and the concave surface place of described heat radiation stator also is provided with the draw-in groove that is complementary with described claw, so that described cosmetic sheet can tightly be connected on the described heat radiation stator.
Further, the edge of described lamp plate also is provided with limited mouth, and described cosmetic sheet top also is provided with the restriction protrusion that is complementary with described limited mouth, places on the described cosmetic sheet so that described lamp plate can be stablized.
Further, also be provided with the adapter sleeve of hollow between the bottom port of described heat radiation main body and the lamp holder, also be provided with through hole on the platform at described heat radiation stator middle part, described through hole cross-under has the screw that screws up described adapter sleeve top, described lamp holder screws up the bottom of described adapter sleeve, and fixes by getting mode ready.
Further, also be serially connected with for the LED driver module that guarantees the chip steady operation in the middle of the described wire, described LED driver module places the cavity of described adapter sleeve.
Further, described heat radiation stator and described heat radiation main body contact portion are coated with heat-conducting silicone grease.
Further, be coated with silica gel on the pad of described wire and lamp plate welding.
The invention has the beneficial effects as follows: technical solution of the present invention is posted the heat radiation stator in the bottom of lamp plate by the heat conductive insulating double faced adhesive tape, described heat radiation stator and lamp plate are by the isolation of cosmetic sheet overall safety, and described heat radiation stator and heat radiation main body close contact, so that the heat on the lamp plate can distribute by described heat radiation stator, heat radiation main body, solved heat dissipation problem; On the other hand, because the buffer action that is perfectly safe of heat conductive insulating double faced adhesive tape and cosmetic sheet, so that the distance between the conductive layer of heat radiation stator and lamp plate can reach the electric clearance safety requirements, fully isolation between the electric and heat radiation main body of lamp plate, can by high pressure resistant test, guarantee the security performance of product.
Description of drawings
Fig. 1 is the installation diagram of the insulation high-voltage LED bulb that provides of the embodiment of the invention;
Fig. 2 is the structure chart after insulation high-voltage LED bulb assembling that the embodiment of the invention provides is finished;
Fig. 3 is the structure chart of heat radiation stator in the preferred embodiment of the present invention;
Fig. 4 is the structure chart of cosmetic sheet in the preferred embodiment of the present invention.
The specific embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
For technical solutions according to the invention are described, describe below by specific embodiment.
Fig. 1 shows the assembly structure of the insulation high-voltage LED bulb that the embodiment of the invention provides, and Fig. 2 shows the surface structure after the assembling of insulation high-voltage LED bulb is finished, and only shows for convenience of explanation the part relevant with the embodiment of the invention.
See figures.1.and.2, the insulation high-voltage LED bulb that present embodiment provides comprises heat radiation main body 1, the lamp holder 3 that blocks the lampshade 2 of described heat radiation main body 1 top port and be located at described heat radiation main body 1 bottom, also be provided with lamp plate 4 in the described insulation high-voltage LED bulb, pad on described lamp plate 4 conductive layers is connected to described lamp holder 3 by wire 5, the bottom of described lamp plate 4 is pasted with heat radiation stator 7 by heat conductive insulating double faced adhesive tape 6, described heat radiation stator 7 be embedded in the top port of described heat radiation main body 1 and with heat radiation main body 1 close contact, also be provided with the cosmetic sheet 8 that both overall safeties are isolated between the periphery of described lamp plate 4 and the heat radiation stator 7.
Present embodiment has increased heat conductive insulating double faced adhesive tape 6 and cosmetic sheet 8 on the basis of existing insulation high-voltage LED bulb structure, described heat radiation stator 7 is bonded as one by heat conductive insulating double faced adhesive tape 6 with the bottom (being the heat dispersion substrate of lamp plate) of lamp plate 4, isolate by cosmetic sheet 8 between lamp plate 4 and the heat radiation stator 7 simultaneously, so that definitely insulation between lamp plate 7 and the heat radiation main body 1, common described heat radiation main body 1 is aluminium material, even in the breakdown situation of lamp plate 4, described heat radiation main body 1 can not leaked electricity yet, and has guaranteed the security performance of product.Aspect heat radiation, during high-voltage LED bulb work, can produce a large amount of heats on the conductive layer of lamp plate 4, described heat is by the heat-radiating substrate on the lamp plate, heat conductive insulating double faced adhesive tape 6, heat radiation stator 7, heat radiation main body 1 can distribute well, so that high-voltage LED bulb can not work long hours in the condition of high temperature, guaranteed the service life of high-voltage LED bulb, further in order to increase radiating effect, as preferred embodiment a kind of, described heat radiation stator 7 is coated with heat-conducting silicone grease with described heat radiation main body 1 contact portion, so that the heat of heat radiation stator 7 can pass to heat radiation main body 1 well.Aspect the electrical safety standard, between the tangible product surface and conductor that arrives of human body, must pass through 4000V, the 5mA leakage current also continues 1 minute high pressure resistant test, guarantee product safety, in the present embodiment, because heat radiation main body 1 is metal material with heat radiation stator 7, described heat radiation main body 1 can contact with human body, therefore must be by high pressure resistant test between whole lamp plate 4 and the heat radiation stator 7, if existing high-voltage LED bulb is in order to guarantee radiating effect, the heat-radiating substrate of lamp plate 4 is directly contacted with heat radiation main body 1, owing to be subjected to the heat radiation restriction between the conductive layer of lamp plate 4 and the heat-radiating substrate, it is very large that its gap can't be done, do not reach the minimum of a value (such as 1.7mm) of electrical standard requirement, be difficult to pass through voltage-withstand test, but in the present embodiment, owing to increased the heat conductive insulating double faced adhesive tape, what the gap between the conductive layer of described heat radiation stator 7 and lamp plate 4 can be done thus is relatively large, can satisfy the requirement of electric clearance minimum of a value, so the insulation high-voltage LED bulb that present embodiment provides is on the basis that the heat radiation that guarantees requires, can by high pressure resistant test, satisfy the electrical safety standard-required.
Concrete, present embodiment does not limit the connected mode of described wire 5, but as a kind of preferred implementation, in the present embodiment, described cosmetic sheet 8 also offers the breach that aligns with the edge of heat radiation stator 7, and described wire 5 is close to the surface of described lamp plate 4 and is passed described breach and enter on the described lamp holder 3 of being connected internally to of described heat radiation main body 1.Through experimental verification, if perforate on the heat-radiating substrate of lamp plate 4 and described heat conductive insulating double faced adhesive tape, and described wire 5 passes described perforate from the conductive layer of lamp plate 4 and enters in the heat radiation main body 1 and be connected on the lamp holder 3, because electric insulation layer is destructurized, when high pressure resistant test, be easy to breakdown between described conductive layer and the heat radiation stator 7, heat conductive insulating double faced adhesive tape 6 is owing to there is perforate to reduce insulating properties, cause described heat radiation stator 7 to become electrical body, and heat radiation stator 7 is conducting with heat radiation main body 1, if therefore adopt this conductor wiring mode, can't by high pressure resistant test, can not guarantee the safe application performance of product.And in the present embodiment optimal way, wire is the surface process from conductive layer, and enters on the described lamp holder 3 of being connected internally to of described heat radiation main body 1 by described breach, passes through like this test of many times, can be by high pressure resistant test.Simultaneously, electrical standard requires wire and the external world to have the double insulation requirement, as a kind of optimal way, described wire 5 also is socketed with insulating sleeve 51 with the contact portion of described breach, heat radiation main body 1, and described like this insulating sleeve 51 can further guarantee wire 5 and external insulation, further guarantees Product Safety, if directly adopt the double insulation electric wire, can increase the space like this, and wire and may cover the light-emitting area of LED when passing lamp plate 4 surface, illumination effect affected.Further, be coated with silica gel on the pad of described wire 5 and lamp plate 4 welding, so fixedly solder joint and prevent the pad oxidation has guaranteed the quality of bulb.
The below lists a kind of concrete preferred structure of described heat radiation stator 7, in this preferred embodiment, as shown in Figure 3, the middle part of described heat radiation stator 7 is the platform of projection, periphery is concave surface, described cosmetic sheet 8 is positioned on the described concave surface, and described platform surface sticks on the bottom of described lamp plate 4 by heat conductive insulating double faced adhesive tape 6.Here because the middle part of heat radiation stator 7 is the platform of projection, so that the distance of heat radiation stator 7 and lamp plate 4 can be not excessive and then be had influence on radiating effect.As a kind of assembling mode, as shown in Figure 4, described cosmetic sheet 8 bottoms also are provided with claw 81, the concave surface place of described heat radiation stator 7 also is provided with the draw-in groove 71 that is complementary with described claw 81, described cosmetic sheet 8 tightly is connected on the described heat radiation stator 7 by claw 81, the edge of described lamp plate 4 also is provided with limited mouth 41 simultaneously, described cosmetic sheet 8 tops also are provided with the restriction protrusion 82 that is complementary with described limited mouth 41, described lamp plate 4 can be stablized by described limited mouth 41 and places on the described cosmetic sheet 8, so just can uniquely determine described lamp plate 4, the position relationship of cosmetic sheet 8 and heat radiation stator 7, guaranteed when each assembling, can both be exactly with lamp plate 4, cosmetic sheet 8 and heat radiation stator 7 are fixed as one, and lay the foundation for realizing batch production.
Here, in order to further facilitate production and assembly, described lamp holder 3, heat radiation main body 1 and heat radiation stator 7 are fixed as one by adapter sleeve 9, concrete, institute's adapter sleeve 9 is hollow, the bottom port that described heat radiation main body 1 is passed on the top arrives at the bottom of described heat radiation stator 7 always, also be provided with through hole 72 on the platform at described heat radiation stator 7 middle parts, described through hole 72 cross-under have the screw 10 that screws up described adapter sleeve 9 tops, by this assembling mode, described heat radiation main body 1 can firmly be fixed between heat radiation stator 7 and the adapter sleeve 9, and therefore whole bulb can firmly be fixed as one.In addition, described lamp holder 3 screws up the bottom of described adapter sleeve 9, and fixes by getting mode ready.
On the other hand, in order to improve the antijamming capability of bulb, guarantee chip and circuit working stability on the lamp plate, prolong the service life of bulb, also be serially connected with LED driver module 52 in the middle of the described wire 5, described LED driver module 52 places the cavity of described adapter sleeve 9.In the present embodiment; described LED driver module 52 can be realized overvoltage protection, anti-high short circuit current, em filtering, anti-voltage surge function; after described LED driver module 52 usefulness insulating sleeves encase; put into the adapter sleeve 9 of high temperature resistant material, described wire 5 is connected with described lamp holder 3 after being serially connected with LED driver module 52.
So far, insulation high-voltage LED bulb concrete structure and several preferred structure that the embodiment of the invention provides have been described, when production application, by again one assembling behind the parts of producing each bulb, the below provides a kind of attainable assembling flow path of the present invention, the structure that can better understand the present invention by this flow process.Specific as follows:
Behind the LED driver module 52 two ends welding leads 5 of step S101, at first anti-electromagnetic interference, encase LED driver module 52 with insulating sleeve, wherein a section lead is welded on the pad of lamp plate 4 after putting insulating sleeve, and coats silica gel at the pad point.The back side of lamp plate 4 has pasted the single face of heat conductive insulating double faced adhesive tape 6 in advance.
Step S102, the bottom port of heat radiation main body 1 is stretched on adapter sleeve 9 tops, will resist again the another end wire of the LED driver module 52 of electromagnetic interference pass with main body 1 assembling of dispelling the heat after adapter sleeve 9 bottom through-holes, undertaken electric fixing by lamp holder 3.The LED driver module 52 of anti-electromagnetic interference is placed in the adapter sleeve 9 of high temperature resistant material.
Step S103, with cosmetic sheet 8 be connected to the heat radiation stator 7 concave surface on, heat radiation stator 7 bottom margins are coated heat-conducting silicone grease, be fixed to described adapter sleeve 9 tops with screw 10 stator 7 that will dispel the heat, so far described thermosetting stator 7, heat radiation main body 1, adapter sleeve 9 can be fixed as one;
Step S104, the another side of described lamp plate 4 by heat conductive insulating double faced adhesive tape 6 sticked on the surface of heat radiation stator 7 again, and spacing with the limited mouth 41 on the lamp plate 4 by the restriction protrusion 82 on the cosmetic sheet 8; Lamp plate passes cosmetic sheet 8 and the breach part of the stator 7 that dispels the heat with LED driver module 52 wire 5 before that the pyrocondensation insulating sleeve is arranged.
The upper AB glue of point in step S105, heat radiation main body 1 tip edge is fixed lampshade 2 to its bayonet socket, after the glue solidifies, can also play the electrocution-proof protection effect;
Step S106, get mode ready with machine, a circle punching of part on the lamp holder 3 is advanced in the adapter sleeve, firmly fixing.
So far finish a high-voltage LED bulb assembling, can produce in batches in this manner.
To sum up, the insulation high-voltage LED bulb that the invention provides embodiment provides is compared with existing high-voltage LED bulb, under the condition of isolated insulation that guarantees to be perfectly safe, can reach good radiating effect, prolonged the service life of bulb, simultaneously also can by high pressure resistant test, guarantee the electrical safety performance of bulb.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
- One kind the insulation high-voltage LED bulb, comprise heat radiation main body (1), the lamp holder (3) that blocks the lampshade (2) of described heat radiation main body (1) top port and be located at described heat radiation main body (1) bottom, also be provided with lamp plate (4) in the described insulation high-voltage LED bulb, pad on described lamp plate (4) conductive layer is connected to described lamp holder (3) by wire (5), it is characterized in that, the bottom of described lamp plate (4) is pasted with heat radiation stator (7) by heat conductive insulating double faced adhesive tape (6), described heat radiation stator (7) be embedded in the top port of described heat radiation main body (1) and with heat radiation main body (1) close contact, also be provided with the cosmetic sheet (8) that both overall safeties are isolated between the periphery of described lamp plate (4) and the heat radiation stator (7).
- 2. high-voltage LED bulb as claimed in claim 1 insulate, it is characterized in that, described cosmetic sheet (8) also offers the breach that aligns with the edge of heat radiation stator (7), and described wire (5) is close to the surface of described lamp plate (4) and is passed described breach and enter being connected internally on the described lamp holder (3) of described heat radiation main body (1).
- 3. the high-voltage LED bulb that insulate as claimed in claim 2 is characterized in that, described wire (5) also is socketed with insulating sleeve (51) with the contact portion of described breach, heat radiation main body 1.
- 4. such as claim 1-3 insulation high-voltage LED bulb as described in each, it is characterized in that, the middle part of described heat radiation stator (7) is the platform of projection, periphery is concave surface, described cosmetic sheet (8) is positioned on the described concave surface, and described platform surface sticks on the bottom of described lamp plate (4) by heat conductive insulating double faced adhesive tape (6).
- 5. high-voltage LED bulb as claimed in claim 4 insulate, it is characterized in that, described cosmetic sheet (8) bottom also is provided with claw (81), the concave surface place of described heat radiation stator (7) also is provided with the draw-in groove (71) that is complementary with described claw (81), so that described cosmetic sheet (8) can tightly be connected on the described heat radiation stator (7).
- 6. high-voltage LED bulb as claimed in claim 5 insulate, it is characterized in that, the edge of described lamp plate (4) also is provided with limited mouth (41), described cosmetic sheet (8) top also is provided with the restriction protrusion (82) that is complementary with described limited mouth (41), places on the described cosmetic sheet (8) so that described lamp plate (4) can be stablized.
- 7. high-voltage LED bulb as claimed in claim 6 insulate, it is characterized in that, also be provided with the adapter sleeve (9) of hollow between the bottom port of described heat radiation main body (1) and the lamp holder (3), also be provided with through hole (72) on the platform at described heat radiation stator (7) middle part, described through hole (72) cross-under has the screw (10) that screws up described adapter sleeve (9) top, described lamp holder (3) screws up the bottom of described adapter sleeve (9), and fixes by getting mode ready.
- 8. the high-voltage LED bulb that insulate as claimed in claim 7 is characterized in that, also is serially connected with for the LED driver module (52) that guarantees the chip steady operation in the middle of the described wire (5), and described LED driver module (52) places the cavity of described adapter sleeve (9).
- 9. the high-voltage LED bulb that insulate as claimed in claim 8 is characterized in that, described heat radiation stator (7) is coated with heat-conducting silicone grease with described heat radiation main body (1) contact portion.
- 10. the high-voltage LED bulb that insulate as claimed in claim 9 is characterized in that, is coated with silica gel on the pad of described wire (5) and lamp plate (4) welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210457358.8A CN102980064B (en) | 2012-11-14 | 2012-11-14 | Insulated high pressure light-emitting diode (LED) lamp bulb |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210457358.8A CN102980064B (en) | 2012-11-14 | 2012-11-14 | Insulated high pressure light-emitting diode (LED) lamp bulb |
Publications (2)
| Publication Number | Publication Date |
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| CN102980064A true CN102980064A (en) | 2013-03-20 |
| CN102980064B CN102980064B (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210457358.8A Expired - Fee Related CN102980064B (en) | 2012-11-14 | 2012-11-14 | Insulated high pressure light-emitting diode (LED) lamp bulb |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104295962A (en) * | 2014-10-09 | 2015-01-21 | 上海鼎晖科技股份有限公司 | LED lamp with insulation protection |
| CN106764523A (en) * | 2016-12-23 | 2017-05-31 | 中国铁道科学研究院通信信号研究所 | LED light source railway signal bulb and special lamp holder |
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| US20070236935A1 (en) * | 2006-03-31 | 2007-10-11 | Augux Co., Ltd. | LED lamp conducting structure with plate-type heat pipe |
| CN201344471Y (en) * | 2009-01-20 | 2009-11-11 | 深圳市众明半导体照明有限公司 | Insulating voltage-resistance device capable of being applied to lamp |
| CN202302826U (en) * | 2011-09-28 | 2012-07-04 | 董金浩 | Novel bulb lamp |
| CN102588755A (en) * | 2011-01-11 | 2012-07-18 | 深圳市长方半导体照明股份有限公司 | Light-emitting diode (LED) bulb lamp |
| JP2012212680A (en) * | 2012-06-15 | 2012-11-01 | Toshiba Lighting & Technology Corp | Led bulb and lighting fixture |
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2012
- 2012-11-14 CN CN201210457358.8A patent/CN102980064B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070236935A1 (en) * | 2006-03-31 | 2007-10-11 | Augux Co., Ltd. | LED lamp conducting structure with plate-type heat pipe |
| CN201344471Y (en) * | 2009-01-20 | 2009-11-11 | 深圳市众明半导体照明有限公司 | Insulating voltage-resistance device capable of being applied to lamp |
| CN102588755A (en) * | 2011-01-11 | 2012-07-18 | 深圳市长方半导体照明股份有限公司 | Light-emitting diode (LED) bulb lamp |
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| JP2012212680A (en) * | 2012-06-15 | 2012-11-01 | Toshiba Lighting & Technology Corp | Led bulb and lighting fixture |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104295962A (en) * | 2014-10-09 | 2015-01-21 | 上海鼎晖科技股份有限公司 | LED lamp with insulation protection |
| CN104295962B (en) * | 2014-10-09 | 2017-01-18 | 上海鼎晖科技股份有限公司 | LED lamp with insulation protection |
| CN106764523A (en) * | 2016-12-23 | 2017-05-31 | 中国铁道科学研究院通信信号研究所 | LED light source railway signal bulb and special lamp holder |
| CN106764523B (en) * | 2016-12-23 | 2024-01-26 | 中国铁道科学研究院通信信号研究所 | Railway signal bulb with LED light source and special lamp holder |
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| CN102980064B (en) | 2015-06-10 |
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Granted publication date: 20150610 Termination date: 20171114 |