CN102809118A - Light-emitting device and compound lens thereof - Google Patents

Abstract

A light-emitting device comprises a light-emitting module and a compound lens. The composite lens is arranged above the light emitting module and comprises a first lens part, a second lens part, a third lens part and a fourth lens part. The first lens part emits a first group of light rays emitted by the light emitting module out of the first lens part in a total reflection mode. The second lens part transmits a second group of light rays emitted by the light emitting module through the third lens part in a total reflection mode and emits the second group of light rays from the fourth lens part. The third lens portion emits a third group of light rays emitted by the light emitting module from the fourth lens portion in a total reflection manner. The fourth lens part emits a fourth group of light rays emitted by the light-emitting module from the fourth lens part. Therefore, the light emitting device can improve the light emitting angle to achieve high-angle light distribution. In addition, the invention also discloses a composite lens.

Description

Light emitting device and compound lens thereof

technical field

The present invention relates to a light-emitting device and its compound lens, in particular to a light-emitting device with a light-emitting diode as a light source and its compound lens.

Background technique

In recent years, due to the continuous improvement of light emitting diode (Light Emitting Diode, LED) in terms of manufacturing process and materials, the luminous efficiency of light emitting diode has been greatly improved. Different from ordinary fluorescent lamps or energy-saving light bulbs, light-emitting diodes have the characteristics of low power consumption, long service life, high safety, short luminous response time and small size. Therefore, light-emitting diodes have been widely used in many types of electronic products . One of the applications is to use light-emitting diodes as light bulbs to replace traditional fluorescent tubes and fluorescent bulbs.

Please refer to FIG. 1 , the known LED lamp 1 has an LED 11 and a circuit board 12 . The light emitting diode 11 is arranged on the circuit board 12, and will light up when the light emitting diode 11 is driven. However, since the light emitted by the LED 11 is directional and needs to be installed on the base to facilitate heat dissipation, the light irradiation area of the LED lamp 1 is about 180 degrees, and cannot achieve the nearly 360-degree light distribution of the traditional light bulb. angle. In addition, following the publication of the US Energy Star (Energy Star) specification for LED bulbs, more and more manufacturers of LED bulbs have shifted the original emphasis on light efficiency to light quality. In other words, more attention is paid to the light distribution angle of LED bulbs.

Therefore, how to provide a light-emitting device and its composite lens so that it can increase the light output angle to achieve high-angle light distribution has become one of the important issues.

Contents of the invention

The object of the present invention is to provide a light-emitting device and a compound lens thereof capable of increasing the light output angle to achieve high-angle light distribution.

The present invention can be realized by adopting the following technical solutions.

A light emitting device of the present invention includes a light emitting module and a composite lens. The compound lens is arranged above the light emitting module. The compound lens includes a first lens part, a second lens part, a third lens part and a fourth lens part. The second lens part surrounds and connects the first lens part. The third lens part surrounds and connects with the second lens part. The fourth lens part is disposed around and under the third lens part. The first lens part emits a first group of light rays emitted by the light emitting module through the first lens part in a total reflection manner. The second lens part transmits a second group of light emitted by the light emitting module through the third lens part and emits from the fourth lens part in a total reflection manner. The third lens part emits a third group of light rays emitted by the light emitting module through the fourth lens part in a total reflection manner. The fourth lens part emits a fourth group of light rays emitted by the light emitting module from the fourth lens part.

In an embodiment of the present invention, the first lens part, the second lens part, the third lens part and the fourth lens part form an annular accommodating space.

In an embodiment of the present invention, the light emitting module further includes a substrate, more than three light emitting diodes and a driving circuit. The light-emitting diodes are arranged on the substrate and arranged in the annular accommodating space. The driving circuit is electrically connected to the light-emitting diodes and lights up the light-emitting diodes.

In an embodiment of the present invention, the lighting device further includes a lampshade, a base and a lamp holder. The lampshade has an accommodating space for accommodating the light emitting module and the composite lens. The base is joined with the lampshade, and carries the light emitting module and the composite lens. The lamp head is engaged with the base. Wherein the base has a heat dissipation structure.

In an embodiment of the present invention, at least one surface of the composite lens has a microstructure.

In an embodiment of the present invention, the first lens part, the second lens part, the third lens part and the fourth lens part are integrally formed.

In one embodiment of the present invention, the light distribution angle of the first lens part is 0 to 45 degrees and 315 to 360 degrees, the light distribution angle of the second lens part is 0 to 90 degrees and 270 to 360 degrees, and the third lens part The light distribution angles of the first lens part are 90 to 150 degrees and 210 to 270 degrees, and the light distribution angles of the fourth lens part are 0 to 90 degrees and 270 to 360 degrees.

In an embodiment of the present invention, the first group of light rays are refracted by a first surface of the first lens portion, totally reflected by a second surface of the first lens portion and refracted by a third surface of the first lens portion to exit.

In an embodiment of the present invention, the second group of light rays is refracted by a first surface of the second lens part, and is totally reflected by a second surface of the second lens part, passes through the third lens part and passes through the fourth lens part. A first surface refracts and emits.

In an embodiment of the present invention, the third group of light rays are refracted by a first surface of the third lens portion, totally reflected by a second surface of the third lens portion and refracted by the first surface of the fourth lens portion to exit.

In an embodiment of the present invention, the fourth group of light rays is refracted by a second surface of the fourth lens portion and refracted by the first surface of the fourth lens portion to exit.

In addition, a compound lens of the present invention includes a first lens part, a second lens part, a third lens part and a fourth lens part. The second lens part surrounds and connects the first lens part. The third lens part surrounds and connects with the second lens part. The fourth lens part is disposed around and under the third lens part.

In an embodiment of the present invention, the first lens part, the second lens part, the third lens part and the fourth lens part form an annular accommodating space.

In an embodiment of the present invention, the first lens part, the second lens part, the third lens part and the fourth lens part are integrally formed.

Based on the above, a light-emitting device and its composite lens of the present invention emit a first group of light rays emitted by the light-emitting module in a total reflection manner through the first lens part; A second group of light emitted by the light-emitting module is emitted from the fourth lens part by total reflection; a third group of light emitted by the light-emitting module is emitted from the fourth lens part by total reflection through the third lens part And through the fourth lens part, a fourth group of light emitted by the light-emitting module is emitted from the fourth lens part, so as to realize the enhancement of the light-emitting angle to achieve a light-emitting device with high-angle light distribution.

Description of drawings

FIG. 1 is a schematic diagram of a known light-emitting diode lamp;

Fig. 2A is a schematic diagram of a light emitting device according to a preferred embodiment of the present invention;

2B is a cross-sectional view of a light emitting device according to a preferred embodiment of the present invention;

3A to 3C are schematic diagrams of variations of light emitting modules according to preferred embodiments of the present invention;

4A to 4D are schematic diagrams of a composite lens according to a preferred embodiment of the present invention; and

Fig. 5 is a schematic diagram of a light emitting device according to a preferred embodiment of the present invention.

Description of main component symbols:

1: LED lamps

11, 212: LED

12: Circuit board

2: Lighting device

21: Lighting module

211: Substrate

2111, 2112: surface

213: Drive circuit

22: compound lens

221: First lens unit

222: second lens part

223: third lens unit

224: fourth lens unit

225: Annular storage space

23: lampshade

231: Accommodating space

24: base

25: Lamp holder

L ₁₁ ~ L ₁₄ : the first group of rays

L ₂₁ ~ L ₂₄ : the second group of rays

L ₃₁ ~ L ₃₄ : the third group of rays

L ₄₁ ~ L ₄₄ : the fourth group of rays

P: microstructure

S ₁ , S ₄ , S ₆ , S ₇ : first surface

S ₂ , S ₅ , S ₈ , S ₉ : second surface

S ₃ : third surface

S ₁₀ : Surface

Detailed ways

A light emitting device and its composite lens according to preferred embodiments of the present invention will be described below with reference to related drawings, wherein the same components will be described with the same reference numerals.

First, please refer to FIG. 2A and FIG. 2B , which are a schematic diagram and a cross-sectional view of a light emitting device 2 according to a preferred embodiment of the present invention, respectively. The light emitting device 2 includes a light emitting module 21 and a composite lens 22 .

In this embodiment, the light emitting module 21 has a substrate 211 , eight light emitting diodes 212 and a driving circuit 213 . Here, the substrate 211 may be a circuit board, and the light emitting diodes 212 are mounted on a surface 2111 of the substrate 211 in an annular manner. In application, in order to reduce the volume of the light emitting module 21, the light emitting diode 212 may be a chip type light emitting diode, of course, the light emitting diode 212 may also be a pin type (DIP) light emitting diode. In addition, the drive circuit 213 is disposed on the substrate 211 and electrically connected to the light emitting diode 212, preferably disposed on another surface 2112 opposite to the light emitting diode 212. Through the wiring on the substrate 211, the drive circuit 213 will control the light emitting diode 212. Bright or not.

It should be noted that in this embodiment, the light-emitting module 21 has eight light-emitting diodes 212 as an example for illustration. diode. Generally speaking, this embodiment is suitable for more than three LEDs. In addition, the present invention does not limit the connection manner between the light emitting diodes of the light emitting module.

Furthermore, the composite lens 22 is disposed above the light emitting module 21 and covers the light emitting diodes 212 . Wherein, the material of the composite lens 22 can be a light-transmitting polymer material, such as polymethyl methacrylate (Polymethly Methacrylate, PMMA), polystyrene (Polystyrene, PS), methyl methacrylate-styrene (Methly -methacrylate-Styrene, MS) or polycarbonate (Polycarbonate, PC) and so on.

Referring to FIG. 2B again, in this embodiment, the compound lens 22 includes a first lens portion 221 , a second lens portion 222 , a third lens portion 223 and a fourth lens portion 224 . The first lens part 221 is located in the central part of the composite lens 22, the second lens part 222 surrounds and connects the first lens part 221, the third lens part 223 surrounds and connects the second lens part 222, and the fourth lens part 224 surrounds and sets below the third lens portion 223 . Wherein, the first lens part 221 , the second lens part 222 , the third lens part 223 and the fourth lens part 224 form an annular accommodating space 225 , and the LED 212 is disposed in the annular accommodating space 225 . In addition, the first lens part 221 , the second lens part 222 , the third lens part 223 and the fourth lens part 224 can be integrally formed.

In this embodiment, the first lens part 221 emits a first group of light rays emitted by the light emitting diode 212 of the light emitting module 21 through the first lens part 221 through at least one total internal reflection (TIR) method. . The second lens part 222 transmits a second group of light rays emitted by the light emitting module 21 through the third lens part 223 and emits from the fourth lens part 224 by means of at least one total reflection. The third lens part 223 emits a third group of light rays emitted by the light emitting module 21 from the fourth lens part 224 by means of at least one total reflection. The fourth lens part 224 emits a fourth group of light emitted by the light emitting module 21 from the fourth lens part 224 .

In addition, it is worth mentioning that in actual use, the light emitting diodes 212 of the light emitting module 21 can be arranged in different ways according to product requirements or design considerations. Please refer to FIG. 3A to FIG. Three implementation architectures of module 21.

As shown in FIG. 3A , the light emitting module 21 has three light emitting diodes 212 . Wherein, the light emitting diodes 212 are disposed on the substrate 211, and the distances between the three light emitting diodes 212 are not equal. Next, as shown in FIG. 3B , the light-emitting module 21 has sixteen light-emitting diodes 212 , and the above-mentioned light-emitting diodes 212 form a double-ring arrangement by dislocation arrangement. As shown in FIG. 3C , the light emitting module 21 also has sixteen light emitting diodes 212 , and the difference from FIG. 3B is that the light emitting diodes 212 arranged in double rings are arranged in the same radial direction.

In this embodiment, the light emitting diodes 212 of the light emitting module 21 can be installed on the substrate 211 in an arrangement of three rings or more than three rings in addition to being arranged on the substrate 211 in an arrangement of equal intervals, in an irregular arrangement, and in a double ring. 211.

Next, please refer to FIG. 4A to FIG. 4D to further describe the first lens portion 221, the second lens portion 222, the third lens portion 223, and the fourth lens portion 224 of the composite lens 22 and the first group of light rays L ₁₁ -L ₁₄ , the relationship among the second group of light rays L ₂₁ -L ₂₄ , the third group of light rays L ₃₁ -L ₃₄ and the fourth group of light rays L ₄₁ -L ₄₄ . Wherein, the angles described below are based on the Y axis.

As shown in FIG. 4A , the first lens portion 221 of this embodiment has a first surface S ₁ , a second surface S ₂ and a third surface S ₃ . The first group of light rays L ₁₁ -L ₁₄ emitted by the light emitting diodes 212 of the light emitting module 21 are refracted by the first surface S ₁ , totally reflected by the second surface S ₂ , refracted by the third surface S ₃ and emitted. Therefore, the first group of light rays L ₁₁ -L ₁₄ emitted from the third surface S ₃ can cover a range of 90 degrees. In other words, the light distribution angles of the first lens portion 221 are 0 to 45 degrees and 315 to 360 degrees.

As shown in FIG. 4B , the second lens portion 222 has a first surface S ₄ and a second surface S ₅ . The second group of light rays L ₂₁ -L ₂₄ emitted by the light emitting diode 222 are refracted by the first surface S ₄ of the second lens portion 222 , are totally reflected from the second surface S ₅ of the second lens portion 222 , and pass through the third The lens part 223 is refracted by a first surface _S6 of the fourth lens part 224 to emit light. Wherein, the irradiation areas of the second group of light rays L ₂₁ -L ₂₄ passing through the second lens portion 222 are 0 to 90 degrees and 270 to 360 degrees.

As shown in FIG. 4C , the third lens portion 223 has a first surface S ₇ and a second surface S ₈ . The third group of light rays L ₃₁ ˜ L ₃₄ emitted by the light emitting diode 212 are refracted by the first surface S ₇ of the third lens portion 223, and are totally reflected from the second surface S ₈ of the third lens portion 223, and then pass through the fourth The refraction of the first surface _S6 of the lens part 224 is emitted. Therefore, the third lens portion 223 distributes the light of the third group of light rays L ₃₁ -L ₃₄ such that the irradiation areas are 90 to 150 degrees and 210 to 270 degrees. In addition, in this embodiment, the first surface _S4 of the second lens part 222 and the first surface _S7 of the third lens part 223 are mutually extending surfaces, and the second surface _S5 of the second lens part 222 The radius of curvature is different from that of the second surface _S8 of the third lens part 223 .

As shown in FIG. 4D , the fourth lens portion 224 includes a first surface S ₆ and a second surface S ₉ . The fourth group of light rays L ₄₁ -L ₄₄ emitted by the light emitting diode 212 are refracted by the second surface S ₉ of the fourth lens portion 224 and refracted by the first surface S ₆ of the fourth lens portion 224 to exit. Therefore, the fourth lens portion 224 distributes light to the fourth group of light rays L ₄₁ -L ₄₄ , so that the irradiation areas are 0 to 90 degrees and 270 to 360 degrees.

In addition, it is worth mentioning that at least one surface of the compound lens 22 has a microstructure P (as shown in FIG. 4A ). In this embodiment, the surface S10 adjacent to the third surface S3 of the first lens portion 221 has microstructures P, and the second surface S9 of the fourth lens portion 224 has microstructures P. Through the arrangement of microstructures P , the light emitted by the light emitting diode 212 can be effectively uniformed. Wherein, the aforementioned microstructure P can be made by ink printing, etching, laser or precision machining. In addition, the cross-sectional shape of the microstructure P is selected from one of wave shape, arc shape, linear shape, triangle shape, polygon shape and irregular shape.

Therefore, through the structure disclosed above, the compound lens 22 can effectively increase the light emitting angle of the light emitting diode 212 , thereby increasing the light emitting quality of the light emitting device 2 .

Next, please refer to FIG. 5 , the lighting device 2 further includes a lampshade 23 , a base 24 and a lamp holder 25 . The lampshade 23 has an accommodating space 231 for accommodating the light emitting module 21 and the composite lens 22 . Wherein, the material of the lampshade 23 may be glass or light-transmitting polymer material. The base 24 is connected with the lampshade 23 and is used for carrying the light emitting module 21 and the composite lens 22 . In addition, the material of the base 24 can be metal, plastic or a combination of the two materials, and the base 24 can be an integrally formed component or a component composed of multiple components. In practice, the base 24 may have a plurality of openings, fins or other heat dissipation structures for the application of heat convection and heat conduction. In addition, one end of the lamp holder 25 is combined with the base 24 , and the other end is used to connect with a lamp holder (not shown in the figure) and receive an external power source for the light emitting module 21 to emit light.

In addition, another embodiment of the present invention discloses a compound lens including a first lens part, a second lens part, a third lens part and a fourth lens part. The second lens part surrounds and connects with the first lens part, and the third lens part surrounds and connects with the second lens part. The fourth lens part is disposed around and under the third lens part.

Since the features and functions of the compound lens of this embodiment are the same as those of the compound lens of the previous embodiment, they will not be repeated here.

In summary, according to a light emitting device and its composite lens of the present invention, a first group of light emitted by the light emitting module is emitted from the first lens part through the first lens part in a total reflection manner; A second group of light emitted by the light emitting module is emitted from the fourth lens part by total reflection; a third group of light emitted by the light emitting module is emitted from the fourth lens part by total reflection through the third lens part A fourth group of light emitted by the light-emitting module is emitted from the fourth lens portion and passed through the fourth lens portion. In this way, the light output angle can be increased to achieve a light emitting device with high-angle light distribution.

The above description is only illustrative, not restrictive. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included within the scope defined in the claims.

Claims (15)

1. a light-emitting device is characterized in that, comprising:

One light emitting module; And

One compound lens is arranged on said light emitting module top, and said compound lens comprises:

One first lens section;

One second lens section, around and connect said first lens section;

One the 3rd lens section, around and connect said second lens section; And

One the 4th lens section, around the below that is arranged on said the 3rd lens section,

Wherein said first lens section is with the total reflection mode; One first group of light that said light emitting module sent is penetrated from said first lens section; Said second lens section is with the total reflection mode; One second group of light that said light emitting module sent is passed said the 3rd lens section and penetrates from said the 4th lens section; Said the 3rd lens section penetrates one the 3rd group of light that said light emitting module sent with the total reflection mode from said the 4th lens section, said the 4th lens section penetrates the four group light that said light emitting module sent from said the 4th lens section.

2. light-emitting device according to claim 1 is characterized in that, said first lens section, said second lens section, said the 3rd lens section and said the 4th lens section form an annular accommodation space.

3. light-emitting device according to claim 2 is characterized in that, said light emitting module also comprises:

One substrate;

Light emitting diode more than three is arranged on the said substrate and is arranged in the said annular accommodation space; And

One drive circuit electrically connects said light emitting diode, and lights said light emitting diode.

4. light-emitting device according to claim 1 is characterized in that, also comprises:

One lampshade has an accommodation space, with ccontaining said light emitting module and said compound lens;

One base engages with said lampshade, and carries said light emitting module and said compound lens; And

One lamp holder engages with said base.

5. light-emitting device according to claim 4 is characterized in that said base has a radiator structure.

6. light-emitting device according to claim 1 is characterized in that, at least one surface of said compound lens has a micro-structural.

7. light-emitting device according to claim 1 is characterized in that, said first lens section, said second lens section, said the 3rd lens section and said the 4th lens section are one-body molded.

8. light-emitting device according to claim 1; It is characterized in that; The luminous intensity distribution angle of said first lens section is 0 to 45 degree and 315 to 360 degree; The luminous intensity distribution angle of said second lens section is 0 to 90 degree and 270 to 360 degree, and the luminous intensity distribution angle of said the 3rd lens section is 90 to 150 degree and 210 to 270 degree, and the luminous intensity distribution angle of said the 4th lens section is 0 to 90 degree and 270 to 360 degree.

9. light-emitting device according to claim 1; It is characterized in that; Said first group of light is via the refraction of a first surface of said first lens section, a second surface total reflection of said first lens section and one the 3rd surface refraction of said first lens section and penetrate.

10. light-emitting device according to claim 9; It is characterized in that; Said second group of light is via the first surface refraction of said second lens section; One second surface total reflection of said second lens section is passed said the 3rd lens section and from the refraction of a first surface of said the 4th lens section and penetrate.

11. light-emitting device according to claim 10; It is characterized in that; Said the 3rd group of light are via the first surface refraction of said the 3rd lens section, and the said first surface of a second surface total reflection of said the 3rd lens section and said the 4th lens section reflects and penetrates.

12. light-emitting device according to claim 11 is characterized in that, said four group light reflects and penetrates via the second surface refraction of said the 4th lens section and the said first surface of said the 4th lens section.

13. a compound lens is characterized in that, comprising:

One first lens section;

One second lens section, around and connect said first lens section;

One the 3rd lens section, around and connect said second lens section; And

One the 4th lens section is around the below that is arranged on said the 3rd lens section.

14. compound lens according to claim 13 is characterized in that, said first lens section, said second lens section, said the 3rd lens section and said the 4th lens section form an annular accommodation space.

15. compound lens according to claim 13, said first lens section, said second lens section, said the 3rd lens section and said the 4th lens section are one-body molded.

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