CN201875471U

CN201875471U - LED (light-emitting diode) lamp tube

Info

Publication number: CN201875471U
Application number: CN2010205681923U
Authority: CN
Inventors: 王子能
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-10-20
Filing date: 2010-10-20
Publication date: 2011-06-22
Anticipated expiration: 2020-10-20

Abstract

The utility model relates to an illuminator, in particular to an LED (light-emitting diode) lamp tube. The lamp tube comprises a heat dissipation base, a lamp shade, a printed circuit board (PCB) and a driving power source; LEDs are distributed on the PCB, wherein an opening of the lamp shade is provided with a first clamping groove and a second clamping groove; the first clamping groove is used for fixing the PCB; the second clamping groove is used for fixing the heat dissipation base; both surfaces of the PCB are coated with high heat conductivity coatings; the heat dissipation base is provided with a clamping block and a bulge; the clamping block is matched with the second clamping groove; the bulge is contacted and matched with the back surface of the PCB; and in addition, a central angle which corresponds to a circular arc of the lamp shade above the PCB is larger than 180 degrees. The PCB is directly clamped on the corresponding clamping grooves of the lamp shade, thereby avoiding the problem of low light emitting efficiency caused by using the heat dissipation base and a double-layer lamp shade to fix the PCB in the prior art. In addition, as the central angle which corresponds to the circular arc of the lamp shade above the PCB is larger than 180 degrees, the loss of light which is reflected to the PCB by the lamp shade is reduced, and the light emitting intensity is further increased.

Description

The LED fluorescent tube

Technical field

The utility model relates to lighting device, specifically is a kind of LED fluorescent tube.

Background technology

China utility model patent CN201368351Y discloses a kind of LED fluorescent tube, it comprises: heat dissipation base, pcb board and lampshade, lampshade is included in interior luminescent layer and the outer luminescent layer that its both sides form two chutes, heat dissipation base is provided with two clamping blocks (first fixed structure 107) and the recess that cooperates with this two chute, and pcb board is arranged in this recess.When two clamping blocks of this heat dissipation base with after two chutes of lampshade combine, the interior luminescent layer of lampshade is to being fixed pcb board.Therefore this LED etc. need not to use fixation kits such as similar screw or rivet, and it is comparatively convenient to assemble.

Yet the amount of light of this light can't be satisfactory, this be because: on the one hand, because the LED fluorescent tube utilizes the interior luminescent layer of lampshade and the recess of heat dissipation base to fix pcb board, makes that the LED on the pcb board need could directly reduce the amount of light of fluorescent tube to external exposure by two-layer shell.On the other hand, because the size of heat dissipation base is bigger, lampshade is positioned at the pairing central angle of circular arc less (less than 180 °) of PCB upper section, and lampshade can and be absorbed partial L ED light reflected back pcb board, this not only can reduce the luminous angle of fluorescent tube, but also can reduce the amount of light of fluorescent tube.

The utility model content

The technical problem that the utility model solves provides the preferable LED fluorescent tube of a kind of light emission rate.

For solving the problems of the technologies described above, the technical solution adopted in the utility model is:

A kind of LED fluorescent tube, it comprises: heat dissipation base, lampshade, pcb board and driving power, be placed with LED on this pcb board, wherein: described lampshade opening part is provided with first draw-in groove that is used for fixing pcb board and second draw-in groove that is used for fixing heat dissipation base, be coated with the high thermal conductivity coating on the described pcb board, described heat dissipation base is provided with clamping block that cooperates with this second draw-in groove and the protuberance that contacts cooperation with the pcb board back side, in addition, described lampshade is positioned at the pairing central angle of pcb board upper section circular arc greater than 180 °.

As one of improving: described high thermal conductivity coating is a copper foil layer.

As two of improvement: described central angle span is 220 ° to 280 °.

As three of improvement: also be provided with radiating fin on the described heat dissipation base.The heat-sinking capability that radiating fin can further improve light fixture is set.

As four of improvement: described driving power comprises the peripheral circuit that MT7910 drives chip and is arranged on fluorescent tube two and is connected with this MT7910 driving chip.

Compared with prior art, the beneficial effects of the utility model are:

On the one hand, pcb board directly is connected on the corresponding draw-in groove of lampshade, has avoided prior art to fix the low problem of light emission rate that pcb board causes with heat dissipation base and double-layer lampshade.In addition, lampshade is positioned at the pairing central angle of pcb board upper section circular arc greater than 180 °, can reduce the loss that lampshade reflexes to the light on the pcb board, further improves the amount of light of light fixture.

On the other hand, owing to strengthened the pairing central angle of pcb board upper section circular arc, keep the size constancy of fluorescent tube if desired, then the size of pcb board and heat dissipation base will be reduced, the problem that can bring heat dispersion to descend thus.Cover the coating of high conductivity on the pcb board two sides and the protuberance that closely contacts with the PCB back side is set on heat dissipation base so the utility model also adopts, to overcome above-mentioned heat dispersion decline problem.

Description of drawings

Fig. 1 is a cutaway view of the present utility model;

Fig. 2 is the structural representation of lampshade of the present utility model;

Fig. 3 is the structural representation of heat dissipation base of the present utility model.

The specific embodiment

As shown in Figure 1, LED fluorescent tube of the present utility model comprises: heat dissipation base 1, lampshade 2, pcb board 3 and driving power (figure does not show) are placed with LED 31 on this pcb board.

Wherein, lampshade 2 opening parts are provided with first draw-in groove 21 that is used for fixing pcb board 3 and second draw-in groove 22 that is used for fixing heat dissipation base.Heat dissipation base 1 is provided with clamping block 12 that cooperates with this second draw-in groove 22 and the protuberance 11 that contacts cooperation with the pcb board back side.Pcb board 3 and heat dissipation base 1 are fixed up with lampshade 2 by first draw-in groove 21 on the lampshade 2 and second draw-in groove 22 respectively.

Wherein, lampshade 2 is positioned at the pairing central angle of pcb board upper section circular arc greater than 180 °, facts have proved that this central angle can take into account light fixture heat-sinking capability and luminous angle for 220 ° to 280 ° preferably.It is 240 ° that lampshade 2 shown in Figure 2 is positioned at the pairing central angle of PCB upper section circular arc.Yet under the situation that the fluorescent tube overall dimensions remains unchanged, this change will reduce the light fixture heat-sinking capability, makes that the LED junction temperature is too high.In order to improve the heat-sinking capability of light fixture, the utility model also adopts measure:

(1) all cover high thermal conductivity coating (figure does not show) on the two sides of pcb board, for example copper foil layer, or high thermal conductivity nano coating etc. are to improve the heat-sinking capability of light fixture.

(2) as shown in figures 1 and 3, be provided with the protuberance 11 that closely contacts with the back side of pcb board, and radiating fin 13 be set to increase the area of dissipation of heat dissipation base at the other end of heat dissipation base 1 at heat dissipation base 1 end relative with the back side of pcb board.

In addition, driving power of the present utility model adopts MT7910 to drive chip, and this chip has current stabilization, the characteristics that efficient is high.And, make peripheral circuit become comparatively simple owing to adopted this chip, and can directly be placed on two of light fixture, help dwindling the light fixture size.

Claims

1. LED fluorescent tube, it comprises: heat dissipation base (1), lampshade (2), pcb board (3) and driving power, be placed with LED(31 on this pcb board), it is characterized in that: described lampshade (2) opening part is provided with first draw-in groove (21) that is used for fixing pcb board (3) and second draw-in groove (22) that is used for fixing heat dissipation base, be coated with the high thermal conductivity coating on the described pcb board, described heat dissipation base (1) is provided with clamping block (12) that cooperates with this second draw-in groove (22) and the protuberance (11) that contacts cooperation with the pcb board back side, in addition, described lampshade is positioned at the pairing central angle of pcb board upper section circular arc greater than 180 °.

2, LED fluorescent tube according to claim 1 is characterized in that: described high thermal conductivity coating is a copper foil layer.

3, LED fluorescent tube according to claim 2 is characterized in that: described central angle span is 220 ° to 280 °.

4, according to the arbitrary described LED fluorescent tube of claim 1 to 3, it is characterized in that: also be provided with radiating fin (13) on the described heat dissipation base.

5, according to the arbitrary described LED fluorescent tube of claim 1 to 3, it is characterized in that: described driving power comprises that MT7910 drives chip and is arranged on fluorescent tube two and drives the peripheral circuit that chip is connected with this MT7910.