TWI402454B - Led fluorescent lamp - Google Patents

Description

LED fluorescent light

The invention relates to a fluorescent lamp, in particular to an LED fluorescent lamp.

Compared with traditional light sources, light-emitting diodes (LEDs) have high luminous efficiency, low radiation, low power consumption, long life, low driving voltage, fast start-up, environmental protection, anti-vibration and compression, and miniaturization of lamps. Lighting devices using LEDs as fluorescent light sources are currently widely used to replace gas fluorescent fluorescent lamps.

The existing LED fluorescent lamp usually consists of a cylindrical transparent lamp tube and an LED light source substrate mounted in the lamp tube. In order to improve the illumination of the LED fluorescent lamp, a plurality of rows of light-emitting diodes (LEDs) are mounted on the LED light source substrate, but all of the light-emitting diodes are irradiated in the same direction, so that the illumination angle of the LED fluorescent lamps is insufficient. In order to increase the illumination angle, the light scattering property of the lampshade is increased. Usually, diffusing particles are added to the material of the lampshade to increase the light scattering property of the lampshade. This method can increase the light scattering effect, but enhances the illumination angle. The effect is not obvious.

In view of this, the present invention provides an LED fluorescent lamp with a good illumination angle.

An LED fluorescent lamp includes a heat dissipation base, a lamp cover and a light source substrate fixed on the heat dissipation base, a power connector mounted on the heat dissipation base and the end of the lamp cover, and the light source substrate is mounted with a plurality of light emitting diodes. The lampshade includes a first cover body and a second cover body. The first cover body is wrapped in the second cover body. The first cover body is made of a transparent material, and the first cover body is provided with a protrusion on a surface away from the light source substrate. The surface of the second cover is provided with a light diffusion layer.

The light emitted by the light-emitting diode passes through the first cover body, and the light-emitting angle of the light is increased by the refraction of the convex portion, and then the scattering effect of the second cover body is formed to form a light having a large illumination angle and uniform softness.

100‧‧‧LED fluorescent lamp

10‧‧‧ Thermal base

11‧‧‧ Heat sink fins

12‧‧‧ recess

13‧‧‧Snap Department

20‧‧‧shade

21‧‧‧First cover

210‧‧‧Into the glossy surface

211‧‧‧Glossy

212‧‧‧ raised parts

22‧‧‧Second cover

23‧‧‧ Cavity

24‧‧‧bump

30‧‧‧Power connector

40‧‧‧Light source substrate

41‧‧‧Lighting diode

50‧‧‧Light diffusion layer

71‧‧‧First light distribution area

72‧‧‧Second light distribution area

1 is a schematic view of an LED fluorescent lamp according to an embodiment of the present invention.

Figure 2 is a cross-sectional view of the LED fluorescent lamp of Figure 1 taken along the IV-IV direction.

3 is a schematic view of the optical path of the cross section of the LED fluorescent lamp of FIG. 1 along the IV-IV direction.

4 is a view showing two common structures of the boss 212 in an embodiment of the present invention.

FIG. 5 is a light distribution graph of the LED fluorescent lamp and the ordinary fluorescent lamp of FIG. 1. FIG.

Referring to FIG. 1 , the LED fluorescent lamp 100 includes a heat dissipation base 10 , a lamp cover 20 and a power connector 30 . The lamp cover 20 is fixed to the heat dissipation base 10 to form a substantially elongated tubular structure. The power connector 30 is disposed at both ends of the circular tubular structure formed by the heat sink base 10 and the lamp cover 20, and the power connector 30 is used to establish an electrical connection with a power source (not shown).

Please refer to FIG. 2, which is a cross-sectional view of the LED fluorescent lamp of FIG. 1 along the IV-IV direction. The LED fluorescent lamp 100 further includes a light source substrate 40 fixed to the heat dissipation base 10, and the light source substrate 40 is electrically connected to the power connector 30. The light source substrate 40 is provided with a light-emitting diode 41. The light-emitting diode 41 can select a straw-hat type light-emitting diode having a large irradiation angle, a high-power light-emitting diode, or a color light-emitting diode, etc., as needed. kind.

The heat dissipation base 10 can be manufactured by using an aluminum alloy substrate with better heat dissipation. The bottom of the heat dissipation base 10 is provided with a plurality of heat dissipation fins 11 spaced apart from each other, and the heat dissipation fins 11 are used to increase the heat dissipation base 10 . Surface area to speed up air circulation and heat dissipation. A recess 12 is further formed on the heat dissipation base 10, and the recess 12 is disposed on the heat dissipation base 10 opposite to the heat dissipation fins 11. Light source base The plate 40 is disposed in the recess 12, and the light source substrate 40 and the heat dissipation base 10 are adhered by a high thermal conductivity thermal conductive tape, and the heat conduction tape can better conduct heat generated by the light source substrate 40 to the heat dissipation base 10 . Then, heat exchange is performed with the air through the heat dissipation fins 11. The light source substrate 40 can also be fixed to the heat dissipation base 10 by screws or other means, and a heat conduction plate is disposed between the light source substrate 40 and the heat dissipation base 10 for conducting heat generated by the light source substrate 40 to the heat dissipation base. Block 10.

The heat dissipation base 10 further includes a buckle portion 13 that is engaged with the flange 24 at the edge of the lamp cover 20 to fix the lamp cover 20 to the heat dissipation base 10. The globe 20 is disposed directly above the light source substrate 40, and the light emitted from the light-emitting diodes 41 on the light source substrate 40 is transmitted to the outside through the globe 20. The lamp cover 20 includes a first cover body 21 and a second cover body 22. The first cover body 21 is closer to the light source substrate 40 than the second cover body 22. The first cover body 21 and the second cover body 22 are spaced apart from each other and form a cavity. twenty three.

The first cover 21 is made of a transparent material, and specifically one or a mixture of polymethyl methacrylate, polycarbonate, polystyrene, styrene-methyl methacrylate copolymer may be used. The first cover 21 is a circular arc-shaped cover. The surface of the first cover 21 close to the light source substrate 40 is the light incident surface 210, and the surface facing the light incident surface 210 away from the light source substrate 40 is the light exit surface 211. A convex portion 212 of a prism structure is disposed on the light-emitting surface 211. The size of the convex portion 212 gradually decreases as the distance from the light-emitting surface 211 increases, and the convex portion 212 refracts light incident from the light-incident surface 210.

Referring to FIG. 3 together, when the light emitted from the light-emitting diode 41 is incident from the light-incident surface 210, the light is transmitted through the first cover 21 to the convex portion 212, and is refracted in the convex portion 212. In this embodiment, The convex portion 212 generates a diverging effect on the refracted light, thereby increasing the light-emitting angle of the light-emitting diode 41.

The light emitted by the LEDs 41 can be adjusted by the convex portion 212 of the prism structure to adjust the light direction, so that the emitted light is directed to the set light exit angle, thereby adjusting the illumination angle of the LED fluorescent lamp 100. The raised portion 212 of the prism structure can also be asymmetrically designed on the first cover 21 to enable the light emitting diode The light emitted by the 41 is asymmetrically transmitted through the first cover 21, so that the illumination angle of the LED fluorescent lamp 100 side is large, and the illumination angle of the other side is small.

Please refer to FIG. 4, which is two common structures of the convex portion 212 in the present embodiment. Among them, 212a is a serrated protrusion, and 212b is a rounded zigzag protrusion.

The second cover 22 is made of a transparent material, and the transparent material may be one or a mixture of polymethyl methacrylate, polycarbonate, polystyrene, styrene-methyl methacrylate copolymer. The surface of the second cover 22 is provided with a light diffusion layer 50. In the present embodiment, the light diffusion layer 50 is a light diffusion coating applied to the outer surface of the second cover 22. When the light emitted from the light-emitting diode 41 passes through the first cover 21, the light is diffused by the light-diffusing coating on the second cover 22 to form a uniform soft light. A light diffusion coating may also be applied to the inner surface of the second cover 22.

The light diffusion layer 50 may also adhere the light diffusion film to the inner surface or the outer surface in an adhesive manner to increase the light scattering effect and soften the light.

Referring to FIG. 5 together, the first light distribution area 71 indicates the light distribution curve of the LED fluorescent lamp 100 in the embodiment, and the second light distribution area 72 indicates the light distribution curve of the ordinary LED fluorescent lamp. It can be seen that the LED fluorescent lamp in this embodiment can be seen. The illumination angle of 100 is significantly larger than that of ordinary LED fluorescent lamps.

It is to be understood by those skilled in the art that the above embodiments are only intended to illustrate the invention, and are not intended to limit the invention, as long as it is within the spirit of the invention Changes and modifications are intended to fall within the scope of the invention.

10‧‧‧ Thermal base

20‧‧‧shade

21‧‧‧First cover

210‧‧‧Into the glossy surface

211‧‧‧Glossy

212‧‧‧ raised parts

22‧‧‧Second cover

41‧‧‧Lighting diode

50‧‧‧Light diffusion layer

Claims (8)

An LED fluorescent lamp includes a heat dissipation base, a lamp cover and a light source substrate fixed on the heat dissipation base, and a power connector mounted on the heat dissipation base and the end of the lamp cover, wherein the light source substrate is mounted with a plurality of light emitting diodes, The improvement is that the lampshade comprises a first cover body and a second cover body, the first cover body is wrapped in the second cover body, the first cover body is made of a transparent material, and the first cover body is on a surface away from the light source substrate A serrated convex portion is provided which refracts light passing through the serrated convex portion and diverges the refracted light, and a surface of the second cover is provided with a light diffusing layer. The LED fluorescent lamp of claim 1, wherein the raised portion is a rounded zigzag protrusion. The LED fluorescent lamp of claim 1, wherein the light diffusion layer is a light diffusion film, and the light diffusion film is attached to an inner surface or an outer surface of the second cover. The LED fluorescent lamp of claim 1, wherein the light diffusion layer is a light diffusion coating, and the light diffusion coating is coated on an inner surface or an outer surface of the second cover. The LED fluorescent lamp of claim 1, wherein the heat dissipation base comprises a buckle portion, and the edge of the lamp cover is provided with a convex edge, and the buckle portion is engaged with the convex edge of the edge of the lamp cover to fix the lamp cover On the cooling base. The LED fluorescent lamp of claim 1, wherein the heat dissipation base further comprises a plurality of spaced heat dissipation fins. The LED fluorescent lamp of claim 1, wherein the heat dissipation base is formed with a recess, and the light source substrate is disposed in the recess. The LED fluorescent lamp of claim 1, wherein the light source substrate is bonded to the heat dissipation base by a thermally conductive thermal conductive tape.