CN103968271A - LED illumination device - Google Patents

Abstract

The invention discloses an LED illumination device which comprises a lamp cover, an LED circuit board and a base, wherein the LED circuit board is fixed to the base; a plurality of light-emitting diodes are arranged on the LED circuit board; the lamp cover comprises a reflection column; the reflection column protrudes from the top of the lamp cover, far away from the base and extends to one side close to the LED circuit board; the surface of the reflection column is coated with a reflection layer; light rays emitted from the light-emitting diodes pass through the lamp cover and are emitted to the outside of the LED illumination device. According to the LED illumination device, the light rays which pass through the lamp cover and are reflected to the outside of the LED illumination device are provided by the light-emitting diodes and the reflection column, and the luminous angle of the LED illumination device is remarkably increased.

Description

LED lighting

technical field

The invention relates to an LED lighting device, in particular to an LED lighting device with a reflective lampshade.

Background technique

Compared with traditional light sources, light-emitting diodes (LEDs) have higher luminous efficiency (the temperature of the light source is lower than ordinary bulbs), low radiation, low power consumption, long life, low voltage, fast startup, environmental protection, shock resistance and pressure resistance, lamps can be Due to the advantages of miniaturization, lighting devices using LEDs as light sources are currently widely used in various lighting applications, such as indoor lighting, outdoor lighting, portable lighting (such as flashlights), and situational lighting. In particular, using LED as a light source to replace ordinary incandescent lamps (tungsten filament bulb lamps) as a green energy-saving lamp is of great significance in the energy-saving field and economy. Commonly seen LED lighting devices can not directly replace traditional light bulbs because the directivity of LED light is 180-degree visible light, and the light-emitting pattern is completely different from traditional light bulbs. It is conducive to the promotion of LED lighting applications.

In order to solve the problem of the light emitting angle of LED lamps, in the prior art, the design of the lampshade exceeding the hemisphere is often used to increase the extension of the LED to the light beyond 180° and increase the light emitting angle. More concentrated, not conducive to heat dissipation.

Contents of the invention

In view of this, the present invention provides an LED lighting device with a large luminous angle and good heat dissipation.

An LED lighting device comprising a lampshade, an LED circuit board and a base, the LED circuit board is fixed on the base, a plurality of light-emitting diodes are arranged on the LED circuit board, and the lampshade includes a reflective column extending from the lampshade The top protrudes away from the base and extends toward the side close to the LED circuit board. The surface of the reflective column is coated with a reflective layer; the light emitted by the light emitting diode passes through the lampshade and is emitted to the outside of the LED lighting device.

When the LED lighting device is in operation, part of the light emitted by the light-emitting diodes shoots to the reflective layer on the reflective column, and the other part of the light directly passes through the lampshade to the outside of the LED lighting device, and then shoots to the The light of the reflective column will be evenly reflected until it passes through the lampshade and is refracted to the outside of the LED lighting device. The reflective column protrudes from the top of the lampshade to the side close to the LED circuit board. The reflective layer coated on the reflective column can change the transmission path of light. Provided, so the light emitting angle of the LED lighting device exceeds 180°.

Description of drawings

FIG. 1 is a schematic perspective view of the three-dimensional structure of an LED lighting device in an embodiment of the present invention.

FIG. 2 is a schematic diagram of the exploded structure of the LED lighting device in FIG. 1 .

Fig. 3 is a cross-sectional view of the LED lighting device in Fig. 1 along the direction A-A.

FIG. 4 is a schematic structural diagram of a lampshade of the LED lighting device in FIG. 1 .

Fig. 5 is a schematic diagram of a cross-sectional light path along the direction A-A of the LED lighting device in Fig. 1 .

FIG. 6 is a schematic diagram of the light-emitting angle of the LED lighting device in FIG. 1 .

Description of main component symbols

LED lighting 100 lampshade 10 open end 11 top 12 reflective column 13 Ends 131 Refraction 14 reflector 15 LED circuit board 20 led twenty one A printed circuit board twenty two base 30 first end 31 second end 32 heat sink 33 electrical connector 40 insulating ring 41

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

Detailed ways

Please refer to FIG. 1 , the LED lighting device 100 includes a lampshade 10 , a base 30 and an electrical connector 40 . The base 30 includes a first end 31 and a second end 32 opposite to each other. The lampshade 10 is fixed to the first end 31 of the base 30 , and the electrical connector 40 is fixed to the second end 32 . The peripheral outer surface of the base 30 is also provided with a plurality of cooling fins 33 arranged at intervals, and the cooling fins 33 are used to guide the heat generated by the LED lighting device 100 to the outside to protect the LED lighting device 100 . The electrical connector 40 is used to connect with a power socket, and the electrical connector 40 may be a common power interface, such as a screw connector or a bayonet connector. In this embodiment, the LED lighting device 100 further includes an insulating ring 41, the insulating ring 41 is arranged between the base 30 and the electrical connector 40, in this embodiment, the insulating ring 41 is connected to the base 30 and electrical connector 40.

Please refer to FIG. 2 and FIG. 3 together, the LED lighting device 100 further includes an LED circuit board 20 , and the circuit board 20 is fixed on the first end 31 of the base 30 . One or more light-emitting diodes 21 are installed on the LED circuit board 20, and the LED circuit board 20 is accommodated between the lampshade 10 and the base 30, and the light emitted by the light-emitting diodes 21 passes through the lampshade 10 and illuminates the LED lighting device 100. of the exterior. The material of the lampshade 10 can be transparent or translucent glass, plastic and the like.

Please refer to FIG. 4 , the lampshade 10 is a hollow shell with an open end, the lampshade 10 includes an open end 11 and a top 12 oppositely arranged, the open end 11 is connected to the first end 31 of the base 30, so that the lampshade 10 is fixed on the base 30. The top 12 is facing the LED circuit board 20 . In this embodiment, the top 12 is recessed toward the inside of the lampshade 10 to form a reflective column 13 . The height of the reflecting column 13 is smaller than that of the lampshade 10 .

In another embodiment, the reflective post 13 may be a solid or hollow protruding post extending from the top 12 of the lampshade 10 to a side close to the LED circuit board 20 . In other embodiments, the reflective column 13 can also be set as a split column, which is fixed on the inner side of the top 12 of the lampshade 10 by snap-fitting, gluing or threading.

Please also refer to FIG. 5 , the surface of the reflective column 13 is partially or completely coated with a reflective layer. The reflective layer can be white high-scattering paint, which forms a Lambertian surface on the surface of the reflective column 13, and can evenly scatter light irradiated to the reflective layer in any direction. In this embodiment, the inner surface of the top 12 of the lampshade 10 is also coated with the white high-scattering paint. The coating area of the white high-scattering paint on the inner surface of the lampshade 10 can cover the entire top 12, or only cover a part of the top 12, or extend beyond the top 12 to the inner wall of the lampshade 10 (not labeled). The surface coated with the white high-scattering paint on the inner surface of the lampshade 10 forms a reflection portion 15 , while the surface not coated with the white high-scattering paint forms a refraction portion 14 .

In this embodiment, the LED circuit board 20 includes a plurality of light emitting diodes 21 and a printed circuit board 22 , and the plurality of light emitting diodes 21 are distributed on the printed circuit board 22 in a ring shape. The end 131 of the reflection column 13 away from the top 12 of the lampshade 10 is directly facing the center of the annularly distributed LEDs 21 .

Please refer to FIG. 5 again. When the LED lighting device 100 is in operation, part of the light emitted by the light-emitting diode 21 hits the reflective part 15 coated with white high-scattering paint on the inner surface of the lampshade 10, and the other part of the light direct to the refraction portion 14 . The light directed at the refracting part 14 passes through the lampshade 10 and exits to the outside of the LED lighting device 100 , while the light directed at the reflecting part 15 will be uniformly reflected until reaching the refracting part 14 for refraction. to the outside of the LED lighting device 100 . The reflective column 13 protrudes from the top 12 of the lampshade 10 to the side close to the LED circuit board 20, and the reflective layer coated on the reflective column 13 can change the transmission path of the light, because the light directed at the refracting part 14 is emitted by the light source. The diode 21 and the reflection part 15 are provided, so the angle of light emitted to the refraction part 14 has exceeded 180°. The outer surface of the lampshade 10 can be provided with a plurality of dot arrays protruding or recessed on the surface or as a matte diffusion surface to maximize the luminous angle.

Please refer to FIG. 6 , which is a schematic diagram of the light distribution curve of the LED lighting device 100 . The maximum light emitting angle of the light emitted by the light emitting diode 21 is 180°, but the maximum light emitting angle of the LED lighting device 100 can reach 320° after the reflective column 13 is provided. Moreover, since the lampshade 10 does not use a design exceeding a hemisphere, a larger-sized LED circuit board can be used, and its heat dissipation effect has also been greatly improved.

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Alterations and variations are within the scope of the claimed invention.

Claims (9)

1. An LED lighting device, comprising a lampshade, an LED circuit board and a base, the LED circuit board is fixed on the base, the LED circuit board is provided with a plurality of light-emitting diodes, it is characterized in that the lampshade It includes a reflective column, which protrudes from the top of the lampshade away from the base and extends to the side close to the LED circuit board. The surface of the reflective column is coated with a reflective layer; the light emitted by the light emitting diode passes through the The lampshade protrudes to the outside of the LED lighting device. 2. The LED lighting device according to claim 1, characterized in that, the top of the lampshade away from the base is concaved toward the side close to the LED circuit board to form the reflective column, and the height of the reflective column is smaller than that of the said reflective column. The height of the shade. 3. The LED lighting device according to claim 1, wherein a solid or hollow convex column extends from the top of the lampshade far away from the base to the side close to the LED circuit board inside the lampshade to form the reflective column, the The height of the reflection column is smaller than that of the lampshade. 4. The LED lighting device according to claim 1, wherein the reflective column is a split column, which is fixed on the top of the lampshade away from the base by snapping, gluing or threading. On the inner side, the height of the reflecting column is smaller than the height of the lampshade. 5 . The LED lighting device according to claim 1 , wherein the reflective layer is coated on the inner surface of the top of the lampshade away from the base. 5 . 6. The LED lighting device according to claim 1 or 5, characterized in that, the reflective layer coated on the reflective column is white high-scattering paint. 7. The LED lighting device according to claim 1, wherein the material of the lampshade is transparent or translucent glass or plastic. 8. The LED lighting device according to claim 1, wherein the outer surface of the lampshade is provided with a plurality of dot arrays protruding or indented on the surface. 9. The LED lighting device according to claim 1, wherein the plurality of light-emitting diodes are distributed on the LED circuit board in a ring shape, and the end of the reflective column away from the top of the lampshade is opposite to the The center of the ring-shaped distribution of light-emitting diodes.