CN104295943A - Light-emitting diode lamp - Google Patents

Abstract

A light emitting diode lamp, comprising a light guide part and a light emitting diode, the light guide part includes a light exit surface and a light incident surface close to the light exit surface, the light incident surface is located at one end of the light guide part and faces the light emitting diode, the light guide part and the light incident surface The opposite end is provided with a reflective surface. Part of the light emitted by the LED enters the light guide part from the light incident surface, is reflected back into the light guide part through the reflective surface, and then exits from the light exit surface. The light-emitting diode lamp can return the light to the light guide part through the reflection of the reflective surface, thereby improving the light extraction efficiency.

Description

LED lamps

technical field

The invention relates to a lamp, in particular to a light emitting diode lamp.

Background technique

As an emerging light source, light emitting diodes have been widely used in various applications. At present, there are many lamps equipped with light-emitting diodes as light-emitting sources, such as street lamps, car lamps, fluorescent lamps, table lamps, bulb lamps, and the like. Existing light-emitting diode fluorescent lamps usually consist of a light-guiding rod and a light-emitting diode arranged at one end of the light-guiding rod. The light guide rod is equipped with a large number of microstructures on the back opposite to the light-emitting surface, which is used to refract or reflect the light input into the light guide rod by the light-emitting diode, so as to destroy the total reflection of the light in the light guide rod, so that the light can Emitted from the light emitting surface of the light guide rod.

However, due to the high directivity of the light emitted by the LED, after the light enters from one end of the LED light guide rod, a large part of the light will directly pass through the light guide rod, and then exit from the opposite end of the light guide rod. Light leakage occurs. Obviously, the light emitted from the other end of the light guide rod cannot achieve any lighting effect and will be directly wasted, thereby affecting the light extraction efficiency of the entire fluorescent lamp.

Contents of the invention

Therefore, it is necessary to provide a light-emitting diode lamp with high light extraction efficiency.

A light emitting diode lamp, comprising a light guide part and a light emitting diode, the light guide part includes a light exit surface and a light incident surface close to the light exit surface, the light incident surface is located at one end of the light guide part and faces the light emitting diode, the light guide part and the light incident surface The opposite end is provided with a reflective surface. Part of the light emitted by the LED enters the light guide part from the light incident surface, is reflected back into the light guide part through the reflective surface, and then exits from the light exit surface.

Since the opposite end of the light guide part is provided with a reflective surface, the light that reaches the other end of the light guide part can be reflected back into the light guide part by the reflective surface, and then emitted from the light exit surface. Therefore, the light-emitting diode lamp can minimize light leakage, thereby improving light extraction efficiency.

The present invention will be further described below in conjunction with specific embodiments with reference to the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of an LED lamp according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of an LED lamp according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram of an LED lamp according to a third embodiment of the present invention.

FIG. 4 is a schematic diagram of an LED lamp according to a fourth embodiment of the present invention.

FIG. 5 is a schematic diagram of the LED lamp shown in FIG. 4 installed on a fluorescent lamp holder.

Description of main component symbols

LED lamps 10 Light guide 20 gap 200 light emitting surface twenty two Scattering surface twenty four Light incident surface 26 end face 28, 28a led 30 reflector 40, 40a Reflective surface 42, 42a Convex 44 flat 44a microstructure 50 lamp holder 60 socket 62 lampshade 64 plug 70 end cap 72 electrode 74 wire 76 sleeve 78

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

Detailed ways

Please refer to FIG. 1 , which shows an LED lamp 10 according to a first embodiment of the present invention. The LED lamp 10 is a LED fluorescent lamp. The LED lamp 10 includes a light guide portion 20 , and a light emitting diode 30 and a reflector 40 mounted on opposite ends of the light guide portion 20 .

The light guide part 20 is made of transparent or translucent materials, such as epoxy resin, polycarbonate, polymethyl methacrylate and the like. In this embodiment, the light guide part 20 is in the shape of a long rod or a strip, and its cross section is in a regular or irregular shape such as a circle, a rectangle, or a pentagon. The lower part of the light guide part 20 is a light emitting surface 22 , the upper part is a scattering surface 24 , and the left end is a light incident surface 26 . In this embodiment, the light incident surface 26 is a plane located between the light exit surface 22 and the scattering surface 24 . The LED 30 is attached to the light-incident surface 26 directly or through optical glue, so that the light emitted by the LED 30 can directly enter the light-guiding portion 20 from the light-incident surface 26 . The scattering surface 24 of the light guide part 20 can be formed by a large number of microstructures 50 (such as printed ink dots, etched pits, etc.), which can scatter the incident light in various directions, so that the light can be emitted from the light exit surface 22 to guide the light. Department 20 outside.

A convex end surface 28 is formed at the right end of the light guide part 20 , and the reflector 40 is attached on the end surface 28 . The reflector 40 can be a metal film directly plated on the end surface 28, or can be a metal cover fixed on the end surface 28 by glue or the like. In this embodiment, the end surface 28 is an arc surface, and the reflector 40 is also formed in a concave arc shape corresponding to the shape of the end surface 28 . The inner surface of the reflector 40 in contact with the end surface 28 forms a concave arc reflective surface 42 , and the outer surface of the reflector 40 is a convex arc surface 44 parallel to the reflective surface 42 . The reflective surface 42 is disposed facing the LED 30 . After the light emitted by the light emitting diode 30 enters the light guide part 20 from the light incident surface 26, a part of it will directly pass through the light guide part 20 and hit the end face 28. Since the end face 28 is provided with a reflective surface 42, this part of the light will be It will be reflected back into the light guide part 20 by the reflective surface 42 , and then scattered by the scattering surface 24 to be emitted from the light exit surface 22 . Therefore, the light emitting diode lamp 10 of the present invention can prevent light leakage from the end surface 28 of the light guide part 20 , and further improve the overall light extraction efficiency.

Understandably, as shown in FIG. 2 , the end surface 28 a of the light guide part 20 may also be a plane parallel to the light incident surface 26 . At this time, the reflective surface 42a of the reflector 40a still maintains a concave arc shape, so as to achieve a better reflective effect. The difference is that the curvature of the reflective surface 42 a in this embodiment is larger than that of the reflective surface 42 in the previous embodiment. The reflective surface 42 a is separated from the end surface 28 a of the light guide part 20 by a gap 200 . The light emitted from the end surface 28a needs to pass through the gap 200 to reach the reflective surface 42a, and after being reflected by the reflective surface 42a, it has to pass through the gap 200 again to return to the light guide portion 20 from the end surface 28a. The reflector 40a has a different structure from the previous embodiment to match the larger curvature of the reflective surface 42a. In this embodiment, the outer surface of the reflector 40a is a plane 44a parallel to the incident surface, and the distance between it and the reflective surface 42a gradually increases from the middle toward the two sides.

It can also be understood that, as shown in FIG. 3 , the reflector 40 a of the second embodiment can also be applied to the convex end surface 28 of the light guide part 20 of the first embodiment, which can also have the effect of preventing light leakage.

As shown in FIGS. 4-5 , in order to cooperate with the lamp holder 60 of the existing fluorescent lamp, the present invention further installs a plug 70 on the left end of the light guide part 20 . The plug 70 includes an end cap 72 and two electrodes 74 protruding from the outer surface of the end cap 72 . The two electrodes 74 are used to be inserted into the jacks of the socket 62 of the lamp holder 60 to supply power to the LED 30 and to fix the LED lamp 10 at the same time. The LED 30 is respectively connected to the two electrodes 74 through two wires 76 to conduct with the lamp holder 60 . The end cover 72 is sleeved on the left end of the light guide part 20 and fixed with the light guide part 20 . A cavity 720 is formed inside the end cover 72 for accommodating the LED 30 . A plug 70 is also mounted on the right end of the light guide part 20 . The plug 70 is composed of the reflector 40a of the third embodiment, a sleeve 78 protruding from the outer periphery of the reflector 40a, and two electrodes 74 protruding from the outer surface of the reflector 40a. The sleeve 78 is sleeved on the right end of the light guide part 20 to fix the lamp holder 60 and the light guide part 20 . The electrode 74 of the plug 70 at the right end is not connected to the LED 30 , it is mainly used to be inserted into the jack of the other socket 62 of the lamp holder 60 , so as to cooperate with the plug 70 at the left end to jointly fix the LED lamp 10 on the On the lamp holder 60. The lamp holder 60 is further provided with a lampshade 64 above the two sockets 62 for covering the LED lamp 10 and preventing dust or other pollutants from falling on the light guide part 20 and affecting the light output.

Claims (10)

1. A light-emitting diode lamp, comprising a light-guiding portion and a light-emitting diode, the light-guiding portion comprising a light-emitting surface and a light-incident surface close to the light-emitting surface, the light-incident surface being positioned at one end of the light-guiding portion and facing the light-emitting diode, characterized in that: The other end of the light part opposite to the light incident surface is provided with a reflective surface. Part of the light emitted by the LED enters the light guide part from the light incident surface, is reflected back into the light guide part through the reflective surface, and then exits from the light exit surface. 2. The light-emitting diode lamp as claimed in claim 1, wherein the reflective surface is concave arc-shaped. 3. The light emitting diode lamp as claimed in claim 2, wherein the opposite end of the light guide part forms an end surface, and the light passes through the end surface and is reflected back into the light guide part by the reflective surface. 4. The light emitting diode lamp according to claim 3, wherein the reflective surface is bonded to the end surface of the light guide part opposite to the light incident surface. 5. The light-emitting diode lamp as claimed in claim 3, wherein there is a gap between the reflective surface and the end surface. 6. The light-emitting diode lamp as claimed in claim 5, wherein the end surface is in a convex arc shape, and the curvature of the end surface is smaller than the curvature of the reflecting surface. 7. The light emitting diode lamp according to any one of claims 1 to 6, further comprising a plug installed at one end of the light guide part provided with a light incident surface, the plug is electrically connected to the light emitting diode. 8. The light-emitting diode lamp according to any one of claims 3 to 6, further comprising a plug installed at one end of the light guide part provided with an end face, and the reflective surface is the inner surface of the plug. 9. The light-emitting diode lamp as claimed in claim 8, wherein the plug comprises a reflector having a reflective surface, a sleeve formed on the periphery of the reflector, and an electrode formed on the outside of the reflector and opposite to the reflective surface, the sleeve The sleeve is set on the light guide part. 10. The light-emitting diode lamp according to any one of claims 1 to 6, wherein the light-emitting diode lamp is a fluorescent lamp, the light guide part further includes a scattering surface arranged opposite to the light-emitting surface, and the light-incoming surface is located between the scattering surface and the light-emitting surface between.