TWI405929B - Led illuminating device - Google Patents

Abstract

A LED illuminating device includes a substrate, a plurality of LED light sources, a light guide plate and a lampshade. The LED light sources are arranged on the substrate, and the light guide plate is disposed inside the lampshade. The light guide plate defines a light input surface in an end thereof, and the light input surface locates facing the LED light sources. The light guide plate includes two surfaces, and both of the surfaces are curved reflective surfaces, with at least one of them including a plurality of accidented portions, such as protuberances or recesses. After entering the light guide plate from the light input surface, the light beams emitted by the LED light sources are reflected by the reflective surfaces and transmits in the light guide plate. The light beams transmitted to the accidented portions are diffused and go out of the light guide plate. The light beams finally go outside from the lampshade.

Description

LED lighting device

The present invention relates to an LED lighting device, and more particularly to a fluorescent lamp type LED lighting device having a good illumination angle.

Compared with traditional light sources, light-emitting diodes (LEDs) have higher luminous efficiency, low radiation, long life, low power consumption, low pollution, low driving voltage, and miniaturization of lamps. LEDs are used as fluorescent lamps. Devices have gradually gained widespread use and are gradually replacing traditional fluorescent lamps. However, the LED is a point light source, and its illumination angle is small and has strong directivity. The illumination angle of the LED fluorescent lamp is about 100-140 degrees, while the traditional fluorescent lamp is uniformly illuminated 360 degrees for the whole week, and the effective illumination of the LED fluorescent lamp The range is much smaller than traditional fluorescent lamps, so the use of LED fluorescent lamps in traditional fluorescent lamp applications will not match the original lighting design requirements, making LED fluorescent lamps not directly equivalent to traditional fluorescent lamps. In addition, since the current LED lamps are distributed in a dot matrix, and the LED single body has a large luminous intensity, a strong direct glare (bright spot) is formed on the light emitting surface of the LED lamp, and it is a point light source which is distributed in a point shape as viewed from the outside. In the production process or due to the error of the material texture, the luminous efficiency and wavelength of the LED point light source of each LED fluorescent lamp may also be uneven, and the color rendering property is not good, thereby affecting the lighting quality.

In view of the above, it is necessary to provide an LED lighting device having a good illumination angle and capable of improving the direct glare effect of the LED light source.

An LED lighting device comprises a light source substrate, a plurality of LED light sources, a light guide plate and a lamp cover. More The LED light sources are fixed on the light source substrate. The light guide plate is disposed inside the lamp cover, and one end of the light guide plate forms a light incident surface, and the light incident surface is disposed opposite to the LED light source. The light guide plate has an arc shape in cross section, and includes two side surfaces, both of which are reflective surfaces, and the two side surfaces are formed as a first curved surface and a second curved surface. A plurality of convex or concave dimming lines are disposed on at least one side of the light guide plate. After the light from the LED light source enters from the light incident surface, internal reflection transmission is performed between the two side surfaces of the light guide plate, and is irradiated onto the light control pattern to generate a diffused light to be emitted from the side surface of the light guide plate. The light beam is incident on the inner surface of the lamp cover and finally exits through the lamp cover to the outside.

The invention can obtain uniform outgoing light through the arrangement of the light guide plate, can improve the direct glare effect of the LED light source, and can make the LED illumination device have a good illumination angle.

100a, 100b, 100c, 100d, 100e‧‧‧ LED lighting devices

10‧‧‧ Thermal base

11‧‧‧Light source substrate

12‧‧‧LED light source

20‧‧‧Light guide

201‧‧‧Into the glossy surface

2021, 2022, 411‧‧‧ surface

203‧‧‧Dimming lines

210‧‧‧reflective layer

30, 40c‧‧‧ lampshade

301, 302, 412‧‧ ‧ notches

41‧‧‧Reflection

42‧‧‧Transmission section

410, 420‧‧‧Deduction Department

1 is a schematic view of an LED lighting device in a first embodiment of the present invention.

Figure 2 is a cross-sectional view of the LED lighting device II-II in Figure 1.

Fig. 3 is a schematic view showing the illumination of the LED lighting device of Fig. 2.

4 is a cross-sectional view showing an LED lighting device in a second embodiment of the present invention.

Fig. 5 is a cross-sectional view showing an LED lighting device in a third embodiment of the present invention.

Fig. 6 is a schematic view showing the illumination of the LED lighting device in the fourth embodiment of the present invention.

Fig. 7 is a schematic view showing the illumination of the LED lighting device in the fifth embodiment of the present invention.

1 and 2, the LED lighting device 100a is generally an elongated tubular structure of a conventional fluorescent lamp, and includes a heat dissipation base 10, a light source substrate 11, a plurality of LED light sources 12, a light guide plate 20, and a lamp cover 30. The light guide plate 20 is disposed inside the lamp cover 30 and detachably connected to the lamp cover 30. In the embodiment, the inner wall of the lamp cover 30 is provided with notches 301 and 302, and the notches 301 and 302 are respectively associated with the light guide plate 20. The two ends are engaged to fix the light guide plate 20 inside the lamp cover 30. The side of the lamp cover 30 on which the recess 302 is provided and the light source substrate 11 are detachably mounted on the heat dissipation base 10, and the plurality of LED light sources 12 are fixed on the light source substrate 11, so that the heat generated by the LED light source 12 can be dissipated through heat dissipation. The susceptor 10 exchanges heat with air. In other embodiments, when the heat sink base 10 is not required, the light source substrate 11 may be disposed inside the light cover 30. For example, a groove matching the light source substrate 11 may be disposed on the inner wall of the lamp cover 30, and the light source substrate 11 may be buckled. Close into the groove. A plurality of LED light sources 12 and a light source substrate 11 extend into the recess 302.

The light guide plate 20 is made of a light guiding material, and an end opposite to the LED light source 12 is formed into the light incident surface 201. The light guide plate 20 includes two sides facing the inner surface of the lamp cover 30. The two sides respectively form a reflecting surface, and a light transmission channel is formed between the two sides. In this embodiment, the cross section of the light guide plate 20 is formed in an arc shape, and the two sides thereof are a first curved surface 2021 and a second curved surface 2022, respectively. In order to control the light-emitting position and the light-emitting intensity on the surface of the light guide plate 20, a plurality of convex or concave light-adjusting lines 203 are disposed on the first curved surface 2021 and the second curved surface 2022, and the light incident on the light-adjusting texture 203 is diffused. Shoot and shoot.

Referring to FIG. 3, after the outgoing light of the LED light source 12 enters from the light incident surface 201, internal reflection transmission is performed between the first curved surface 2021 and the second curved surface 2022, and the illumination is applied to the first curved surface 2021 and the second curved surface 2022. The light beam of the light grain path 203 is diffused to emit light, and the light beam that is not irradiated to the light control grain 203 is continuously reflected and transmitted until it is irradiated to the light control grain 203, and finally is emitted in a diffused form. The light beams emitted from the first curved surface 2021 and the second curved surface 2022 are irradiated onto the inner surface of the globe 30, and finally are emitted to the outside through the globe.

The lampshade 30 is made of a light guiding material. In one embodiment, the entire inner or outer surface of the lampshade 30 is provided with an optical path having a light refraction effect to illuminate the outgoing light surface, for example, on the inner surface of the lamp cover 30. A plurality of uniformly arranged columnar protrusions are disposed, and the light beam emitted from the light guide plate 20 is incident on the inner surface of the lamp cover 30 and further diffused through the optical grain, thereby lifting the entire lamp. The uniformity and softness of the emitted light on the surface of the cover 30. In another embodiment, only a portion of the surface of the globe 30 is provided with an optical grain. In still another embodiment, the surface of the lamp cover 30 may be provided with no optical lines, and the material of the lamp cover 30 may be made of a diffusion material or a diffusion layer may be disposed on the surface of the lamp cover 30. The diffusion material generally contains methyl methacrylate particles. Methyl methacrylate particles are used as diffusion particles to diffuse light, thereby making the emitted light more uniform and soft.

4 is a cross-sectional view of an LED lighting device 100b according to a second embodiment of the present invention, which is different from the first embodiment shown in FIG. 2 in the present embodiment, in which the light guide plate 20 is A curved surface, for example, a reflective layer 210 is disposed on the first curved surface 2021 to prevent light from exiting the first curved surface 2021, and the light incident on the reflective layer 210 is reflected onto the second curved surface 2022, and is on the second curved surface 2022. The dimming pattern 203 is diffused and emitted, so that the LED illumination device 100b becomes a surface light source that emits a single curved surface, that is, the lamp cover 30 has only a portion adjacent to the second curved surface 2022, and the other portion does not emit light. In another embodiment, one of the curved surfaces of the light guide plate 20 is not provided with a dimming texture, and the surface not provided with the dimming texture is a total reflection surface, and the light is not emitted by the surface, so that the LED illumination device emits light in a sub-region. Among them, the surface on which the reflection sheet is disposed may or may not be provided with a dimming pattern. In still another embodiment, a portion of the surface of the globe 30 adjacent to the first curved surface 2021 on which the reflective layer 210 is disposed is not provided with an optical grain, and other portions are provided with an optical grain.

5 is a cross-sectional view of an LED lighting device 100c according to a third embodiment of the present invention, which is different from the first embodiment shown in FIG. 2 in that, in the present embodiment, the lamp cover 40c includes a reflecting portion. 41 and the transmissive portion 42, the reflecting portion 41 and the transmitting portion 42 are respectively formed in a fan shape, the edges of the reflecting portions 41 are respectively formed with the first engaging portions 410, and the edges of the transmitting portions 42 are respectively formed with the second engaging portions. The first engaging portion 410 of the reflecting portion 41 and the second engaging portion 420 corresponding to the transmitting portion 42 are engaged with each other to fix the reflecting portion 41 and the transmitting portion 42 together, thereby obtaining the shape of a conventional tubular tube. .

The reflective portion 41 is formed near the first fastening portion 410 with a third curved surface 411 having a curvature matching the first curved surface 2021. The third curved surface 411 defines a notch 412 together with the first fastening portions 410 on both sides. The light guide plate 20 is disposed in the recess 412. The first curved surface 2021 and the third curved surface 411 of the reflective portion 41 are adhered to each other, and the third curved surface 411 reflects the light emitted from the first curved surface 2021 adjacent thereto back to the light guide plate. In the 20th, the light finally diffuses and emits light on the dimming line 203 of the second curved surface 2022. In one embodiment, the reflective portion 41 is made of a reflective material, and in another embodiment, the inner and/or outer surface of the reflective portion 41 is coated with a reflective layer. In still another embodiment, the first curved surface 2021 of the light guide plate 20 and the third curved surface 411 are not provided with a dimming pattern, and the surface not provided with the dimming pattern is a total reflecting surface, and the light is not emitted by the surface.

The transmissive portion 42 transmits the light emitted from the second curved surface 2022 adjacent thereto to the outside of the LED illumination device 100c, thereby making the LED illumination device 100c a surface light source that emits a single curved surface. In one embodiment, the surface of the transmissive portion 42 is provided with an optical grain having a light refraction effect that causes the exit surface to be lighted. In another embodiment, the transmissive portion 42 can also be removed, and the second curved surface 2022 directly emits light, thereby obtaining a wide-angle curved surface light source LED illumination device 100d as shown in FIG. 6, and a narrow angle as shown in FIG. Curved surface light source LED lighting device 100e.

According to the arrangement of the light guide plate 20, the LED illumination device can obtain two asymmetric curved light-emitting surfaces with uniform outgoing light, and the arrangement of the reflective layer can easily adjust the light-emitting area, so that the LED illumination device has good illumination. The angle also improves the direct glare of the LED light source.

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.

100a‧‧‧LED lighting device

10‧‧‧ Thermal base

11‧‧‧Light source substrate

12‧‧‧LED light source

20‧‧‧Light guide

201‧‧‧Into the glossy surface

2021, 2022‧‧‧ surface

203‧‧‧Dimming lines

30‧‧‧shade

301, 302‧‧ ‧ notches

Claims (8)

An LED lighting device has an elongated tubular structure, comprising a light source substrate, a plurality of LED light sources, a light guide plate and a lamp cover, wherein the plurality of LED light sources are fixed on the light source substrate, and the improvement is that: two holes are arranged on the inner wall of the lamp cover a notch, the two notches are respectively engaged with the two ends of the light guide plate, the light guide plate is fixed inside the lamp cover, the light source substrate is disposed in at least one notch; the light guide plate and the light guide plate An opposite end of the LED light source is formed into a light incident surface; the light guide plate has an arc shape in cross section, and includes two sides facing the inner surface of the lamp cover, the two sides are reflective surfaces, and are respectively formed as first a curved surface and a second curved surface; at least one side of the light guide plate is provided with a plurality of convex or concave dimming lines; after the outgoing light of the LED light source enters from the light incident surface, on both sides of the light guide plate The internal reflection transmission is performed, and the light is irradiated onto the dimming pattern to generate a diffused light, and the light beam emitted from the side surface of the light guide plate is irradiated onto the inner surface of the lamp cover, and finally passes through the lamp cover and is emitted to the outside. The LED lighting device of claim 1, wherein the surface of the lamp cover is provided with an optical grain having a light refraction effect and a light source surface. The LED lighting device of claim 1, wherein one of the first curved surface and the second curved surface is provided with a reflective layer to prevent light from exiting the curved surface. The LED lighting device of claim 1, wherein the lamp cover comprises a fan-shaped reflecting portion, and edges of the reflecting portions are respectively formed with a first engaging portion, and the reflecting portion is adjacent to the first fastening portion thereof. A third curved surface having a curvature matching the first curved surface is formed at the portion, and the third curved surface defines a notch together with the first engaging portion on both sides thereof, and the light guide plate is disposed in the recess, and the light guide plate is A curved surface and a third curved surface of the reflecting portion are fitted to each other. The LED lighting device of claim 4, wherein the lamp cover further comprises a fan-shaped transmissive portion, and the edges of the two sides of the transmissive portion are respectively formed with a second engaging portion, the reflecting portion The first fastening portion and the second fastening portion corresponding to the transmitting portion are engaged with each other to fix the reflecting portion and the transmitting portion together. The LED lighting device of claim 4, wherein the reflecting portion is made of a reflective material. The LED lighting device of claim 4, wherein the inner surface and/or the outer surface of the reflecting portion is coated with a reflective layer. The LED lighting device of claim 1, wherein the material of the lamp cover is made of a diffusion material or a diffusion layer is disposed on the surface of the lamp cover.