CN103225755A - Led lamp tube - Google Patents

Abstract

The invention discloses an LED lamp tube. The LED lamp tube comprises a lampshade made of translucent plastic, a base of which half is surrounded by the lampshade, a substrate positioned in the lampshade and spliced on the base, and an LED chip arranged on the substrate, wherein the substrate makes contact with the upper side surface of the base for heat conduction; the lower side surface of the base is positioned at an open slot of the lampshade and communicated with the outside; the lampshade and the base are formed at one time through extrusion moulding; the base is made of composite plastic; the composite plastic comprises a plastic matrix and an inorganic filler which is dispersed in the plastic matrix in a nano or micro size. By adopting the structure, the LED lamp tube has the advantages as follows: the LED lamp tube has a good heat dissipating effect; the lamp tube has high heat dissipating performance and good heat dissipating property; heat can be discharged out of the lampshade; and the whole LED lamp tube is relatively energy-saving.

Description

The LED fluorescent tube

Technical field

Related to a kind of LED fluorescent tube among the present invention.

Background technology

LED (Light Emitting Diode) is a kind of solid-state semiconductor devices, and it can directly be converted into light to electricity.

LED fluorescent tube of the prior art need solve a technical barrier usually: how to solve heat dissipation problem, only solving competence exertion LED high power, long service life under the bad precondition of heat radiation, reduce advantages such as light decay.

For example, fluorescent tube as shown in Figure 5, it is made of asagent structure lampshade 1 and pedestal 2.Lampshade 1 andpedestal 2 are rounded substantially.Lampshade 1 is made by the engineering plastics with light transmission,pedestal 2 is made by aluminium section bar, though this Stability Analysis of Structures, good heat dissipation effect is because being connected of aluminium section bar and engineering plastics is difficult for closely, thereby do not have waterproof, a moistureproof function, be not suitable for the open air, and the weight of aluminium section bar is very big, also conducts electricity easily, need isolated from power just can meet standard, and just further increased cost.

As shown in Figure 6, it is made of asagent structure lampshade 1 and pedestal 2.Lampshade 1 andpedestal 2 are rounded substantially.Lampshade 1 andpedestal 2 are made by engineering plastics, though the light weight of engineering plastics, and lampshade and pedestal injection mo(u)lding jointly, but because the engineering plastics radiating effect is poor, therefore, heat accumulates in the fluorescent tube easily, heat in the fluorescent tube is difficult to diffusion, causes heat radiation bad, is easy to generate distortion.

Fluorescent tube among Fig. 7 has certain improvement in fluorescent tube, promptly is provided with analuminium base 5 betweenlampshade 1 andpedestal 2, and the lamp tube structure in Fig. 6 is more stable although it is so, but still does not solve the heat dissipation problem of fluorescent tube.

Can adopt the sticky stuff of heat conduction to make aluminium base and lamp housing fit between traditional substrate and the lamp housing, but photoresist coating process is complicated on the one hand, and the thermal resistance of many sticky stuffs also can increase the heat radiation difficulty between the lamp housing.

Summary of the invention

The invention provides a kind of LED fluorescent tube, it has good performance of heat dissipation, also has waterproof moisture-proof effect preferably.

The invention discloses a kind of LED fluorescent tube, it comprise by light-passing plastic make lampshade, by the pedestal of lampshade semi-surrounding, be positioned at lampshade and peg graft and be arranged on substrate on the pedestal, be arranged on the led chip on the substrate, the heat conduction that contacts with the upper side of pedestal of described substrate, the open slot that the downside of described pedestal is positioned at lampshade communicates outward and with the external world, the common disposable extrusion moulding of described lampshade and described pedestal, described pedestal is made by composite plastic, and composite plastic comprises plastic substrate and the inorganic filler in plastic substrate with nanometer or micron order size dispersion.

Preferably, described lampshade is by a kind of the making among PC, acrylic, PP, the PS.

Preferably, the downside of described pedestal is formed with one or more jogs.

Preferably, described substrate pastes mutually closely with described pedestal.

Preferably, described substrate comprises circuit articulamentum, flexible substrate and rigidity thermally-conductive sheet from top to bottom successively, and described led chip is arranged on the circuit articulamentum, the heat conduction that contacts with described pedestal of described rigidity thermally-conductive sheet.

Preferably, described substrate comprises circuit articulamentum, rigid substrate from top to bottom successively, and described led chip is arranged on the circuit articulamentum, the heat conduction that contacts with described pedestal of described rigid substrate.

Preferably, the diameter of the inorganic filler of described composite plastic is 10^-10～10^-6Rice.

Preferably, the coefficient of heat transfer of described composite plastic is greater than 300W/m²K.

Preferably, the thermal conductivity factor of described composite plastic is between 2～10W/mK.

Preferably, the plastic substrate of described composite plastic comprises one or more in polyamide-based, PET series, epoxy resin, polyimides system, the PPS system.

Preferably, the inorganic filler of described composite plastic comprises one or more in carbon element, oxide based, nitride based, the hydroxide system.

Preferably, described lampshade is in the cross section perpendicular to its long axis direction and is circular arc, and described pedestal is rectangle in the cross section perpendicular to its long axis direction.

Preferably, the common formation of described lampshade and described pedestal one usefulness string will be justified the major part in the separated into two parts.

The present invention adopts above structure, has the following advantages:

1, has better heat radiating effect;

2, the perfect heat-dissipating of fluorescent tube its have good heat dissipation characteristics, heat can be discharged lampshade, entire product is comparatively energy-conservation.

Description of drawings

Accompanyingdrawing 1 is the structural representation of the first embodiment of the present invention.

Accompanyingdrawing 2 is the structural representation of the second embodiment of the present invention.

The situation that accompanyingdrawing 3 is made of rigid substrate for substrate among the present invention.

The situation that accompanyingdrawing 4 is made of flexible substrate for substrate among the present invention.

Accompanyingdrawing 5 is first kind of fluorescent tube of prior art.

Accompanying drawing 6 is second kind of fluorescent tube of prior art.

Accompanying drawing 7 is the third fluorescent tube of prior art.

In the accompanying drawing: 1, lampshade; 2, pedestal; 21, bending part; 22, jog; 3, substrate; 31, circuit articulamentum; 32, rigid substrate; 33, flexible substrate; 34, rigidity thermally-conductive sheet; 4, led chip; 5, aluminium base.

The specific embodiment

Below in conjunction with accompanying drawing preferred embodiment of the present invention is described in detail, thereby protection scope of the present invention is made more explicit defining so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that.

As shown in Figure 1, the first embodiment of the present invention, it compriseslampshade 1,pedestal 2,substrate 3, led chip 4 a kind of LED fluorescent tube.

Lampshade 1 is made by the engineering plastics of printing opacity.When the ledchip 4 that is positioned atlampshade 1 was luminous, light appeared the formation light source from lampshade 1.Concrete,lampshade 1 can be by a kind of the making among PC, acrylic, PP, the PS.Preferably, lampshade is PC.PC is the amorphous polymer of almost colourless glassy state, has well optical.The PC high molecular weight resin has very high toughness, and the cantilever beam notched Izod impact strength is 600～900J/m, and the heat distortion temperature of not filling the trade mark is approximately 130 ° of C, can make this numerical value increase by 10 ℃ after glass fibre strengthens.The bending modulus of PC can reach more than the 2400MPa, and resin can be processed into big rigid articles.When being lower than 100 ℃, the creep rate under load is very low.PC has hydrolytic resistance preferably.

Lampshade 1 semi-surrounding pedestal 2.Lampshade 1 is in the cross section perpendicular to its long axis direction and is circular arc, and described pedestal is rectangle in the cross section perpendicular to its long axis direction.The common formation of described lampshade and described pedestal one usefulness string will be justified the major part in the separated into two parts.

The upper side ofpedestal 2 is positioned atlampshade 1, and the downside ofpedestal 2 is positioned at outside thelampshade 1 and with the external world and communicates.Lampshade 1 andpedestal 2 common disposable extrusion moulding, thereby the combination between them is tight, sealing is good.Therefore the fluorescent tube that is formed bylampshade 1 andpedestal 2 has favorable waterproof property.

Pedestal 2 is made by composite plastic, and composite plastic is to be formed in plastic substrate with nanoscale or micron order size dispersion by inorganic filler.Compare with traditional composite, plastic substrate and inorganic filler are being received in the scope compoundly, and interfacial area is very big between two-phase, there is the chemical bond between the interface, form excellent cohesion, can eliminate the mutually unmatched problem of organic/inorganic, form diverse characteristic and manifest.

Nanoscale or micron-sized material can produce quantum size effect; 1. small-size effect; 2. skin effect; 3. macro quanta tunnel effect; 4. coulomb stops up and quantum tunneling.

Surface by nano level material can be big, easily reunion can reduce the surface energy, eliminate surface charge, weaken surface polarity, with surface coverage modification, mechanochemical modification, theca externa modification, Topically active modification, high-energy surface modification, utilize the precipitation reaction surface modification.Therefore this composite plastic has the hear resistance raising; Thermal diffusivity significantly improves; Air-breathing property and hygroscopicity are lower; Advantages such as the size coefficient of expansion is lower.

The coefficient of heat transfer of composite plastic is greater than 300W/m²K, thermal conductivity factor is between 2-10W/mK.

The plastic substrate of composite plastic can be in polyamide-based (PA), PET series (PET), epoxy resin (Epoxy Resin), polyimides system (PI), the PPS system a kind of.

Polyamide is a kind of engineering plastics commonly used, wherein nylon 6(PA6) have excellent physics and chemical property, it is low to make water absorption rate height, poor dimensional stability, wet strength and the thermal deformation of material stablize, and has limited the use of polyamide to a certain extent.

This nanometer PET material of PETG combines rigidity, the hear resistance of inorganic material with toughness, the processability of PET.

Epoxy resin is as the main material of making copper-clad plate, has excellent comprehensive performances, epoxy resin through the nanometer technology modification, its structure is different from the epoxy composite material of common fillers fully, show extremely strong activity, huge specific surface is easy to and epoxy resin molecule generation key and effect it, improved intermolecular distributary power and still some nano particle be distributed in the space of macromolecular chain, show very high flowability.

Polyimides (PI) is a kind of high heat-resisting organic material of practical application at present, and along with the increase of nanometer SiO2 content, polyimides can significantly promote its heat resistance along with the increase of nano-filled thing content.

Same, along with the increase of nano-filled thing content, can significantly promote its heat resistance among the PPS.

The inorganic filler of composite plastic is a kind of in carbon element, oxide based, nitride based, the hydroxide system.The diameter of inorganic filler is 10^-10～10^-6Rice.

Therefore, the pedestal of being made bycomposite plastic 2 has good thermal diffusivity.

Substrate 3 is positioned atlampshade lampshade 1 and pegs graft and is arranged on the pedestal 2.Substrate 3 is close to the upper side ofpedestal 2 with thermalcontact conductance.Substrate 3 is provided withled chip 4.

As shown in Figure 4,substrate 3 can comprise circuit articulamentum, flexible substrate and rigidity thermally-conductive sheet from top to bottom successively, and led chip is arranged on the circuit articulamentum, the heat conduction that contacts with described pedestal of described rigidity thermally-conductive sheet.Because flexible substrate has elasticity, be difficult to peg graft, thereby one deck rigidity thermally-conductive sheet need be set again finalize the design with pedestal, the rigidity thermally-conductive sheet has certain rigidity and has heat conductivility preferably simultaneously, generally can be materials such as metal.

Substrate 3 can comprise circuit articulamentum, rigid substrate from top to bottom successively, and described led chip is arranged on the circuit articulamentum, the heat conduction that contacts with described pedestal of described rigid substrate.

The heat that sends at illumination condition ledchip 4 conducts topedestal 2 bysubstrate 3, outwards disperses by pedestal 2.Because thispedestal 2 has good thermal diffusivity, so the heat energy that ledchip 4 produces can be bypedestal 2 to external diffusion.Simultaneously, becauselampshade 1 andpedestal 2 common disposable extrusion moulding, thereby this fluorescent tube has waterproof and dampproof function.

Shown in Fig. 1-4,substrate 3 is pegged graft and is arranged on thepedestal 2, is formed with thebending part 21 of bending inwardly on thepedestal 2, andsubstrate 3 is strip, andsubstrate 3 is pegged graft and is stuck on the pedestal 2.This kind connected mode is simple in structure, and assembling is simple, and the length allotment intercepting of fluorescent tube is simple and easy, convenient follow-up installation.

As shown in Figure 2, the difference of the second embodiment of the present invention and the foregoing description is that the downside ofpedestal 2 is formed with one ormore jogs 22, andjog 22 can increase the contact area ofpedestal 2 and air, further increases the heat dispersion ofpedestal 2.

More than specific embodiment of the present invention is illustrated in conjunction with diagram, clearly on the basis of not leaving scope and spirit of the present invention, can much revise prior art and technology.In the technical field, the common knowledge of a GPRS just can be carried out diversified change in technology main idea scope of the present invention under of the present invention.

  

Claims (13)

1. LED fluorescent tube, it is characterized in that: it comprise by light-passing plastic make lampshade, by the pedestal of lampshade semi-surrounding, be positioned at lampshade and peg graft and be arranged on substrate on the pedestal, be arranged on the led chip on the substrate, the heat conduction that contacts with the upper side of pedestal of described substrate, the downside of described pedestal is positioned at outside the lampshade and with the external world and communicates, the common disposable extrusion moulding of described lampshade and described pedestal, described pedestal is made by composite plastic, and composite plastic comprises plastic substrate and the inorganic filler in plastic substrate with nanometer or micron order size dispersion.

2. LED fluorescent tube according to claim 1 is characterized in that: described lampshade is made by among PC, acrylic, PP, the PS one or more.

3. according to the LED fluorescent tube of claim 1, it is characterized in that: the downside of described pedestal is formed with one or more jogs.

4. LED fluorescent tube according to claim 1 is characterized in that: described substrate pastes mutually closely with described pedestal.

5. according to the LED fluorescent tube of claim 1, it is characterized in that: described substrate comprises circuit articulamentum, flexible substrate and rigidity thermally-conductive sheet from top to bottom successively, described led chip is arranged on the circuit articulamentum, the heat conduction that contacts with described pedestal of described rigidity thermally-conductive sheet.

6. according to the LED fluorescent tube of claim 10, it is characterized in that: described substrate comprises circuit articulamentum, rigid substrate from top to bottom successively, and described led chip is arranged on the circuit articulamentum, the heat conduction that contacts with described pedestal of described rigid substrate.

7. LED fluorescent tube according to claim 1 is characterized in that: the diameter of the inorganic filler of described composite plastic is 10^-10～10^-6Rice.

8. LED fluorescent tube according to claim 1 is characterized in that: the coefficient of heat transfer of described composite plastic is greater than 300W/m²K.

9. LED fluorescent tube according to claim 1 is characterized in that: the thermal conductivity factor of described composite plastic is between 2～10W/mK.

10. LED fluorescent tube according to claim 1 is characterized in that: the plastic substrate of described composite plastic comprises one or more in polyamide-based, PET series, epoxy resin, polyimides system, the PPS system.

11. LED fluorescent tube according to claim 1 is characterized in that: the inorganic filler of described composite plastic comprises one or more in carbon element, oxide based, nitride based, the hydroxide system.

12. LED fluorescent tube according to claim 1 is characterized in that: described lampshade is in the cross section perpendicular to its long axis direction and is circular arc, described pedestal is rectangle in the cross section perpendicular to its long axis direction.

13. LED fluorescent tube according to claim 12 is characterized in that: the common formation of described lampshade and described pedestal one usefulness string will be justified the major part in the separated into two parts.

Images