TWI414727B - Light emitting device - Google Patents

Abstract

A light emitting device comprises a light emitting module and a composite lens. The composite lens is arranged above the light emitting module, and the light emitting module includes a first lens unit, a second lens unit, a third lens unit and a fourth lens unit. The first lens unit radiates a first group of lights, which are emitted by the light emitting module, outward from the first lens unit in a total reflection way. The second lens unit radiates a second group of lights, which are emitted by the light emitting module, through the third lens unit and outward from the fourth lens unit in a total reflection way. The third lens unit radiates a third group of lights, which are emitted by the light emitting module, outward from the fourth lens unit in a total reflection way. The fourth lens unit radiates a fourth group of lights, which are emitted by the light emitting module, outward from the fourth lens unit in a total reflection way. Thus, the light emitting angle is improved, thereby providing a light emitting device with high angle light distribution. Besides, the invention also discloses a composite lens.

Description

Illuminating device

The present invention relates to a light-emitting device and a composite lens thereof, and more particularly to a light-emitting device using a light-emitting diode as a light source and a composite lens thereof.

In recent years, due to the continuous improvement of the process and materials of the Light Emitting Diode (LED), the luminous efficiency of the light-emitting diode has been greatly improved. Unlike general fluorescent lamps or power-saving bulbs, LEDs have low power consumption, long life, high safety, short response time and small size. Therefore, LEDs have been widely used in many types. In the electronics. One of the applications is to use a light-emitting diode as a light bulb to replace the traditional fluorescent tube and daylight bulb.

Referring to FIG. 1 , a conventional light-emitting diode lamp 1 has a light-emitting diode 11 and a circuit board 12 . The light emitting diode 11 is disposed on the circuit board 12 and will illuminate when the light emitting diode 11 is driven. However, since the light emitted by the LED 11 has directivity and needs to be mounted on the pedestal for heat dissipation, the light-emitting area of the LED illuminator 1 is approximately 180 degrees, and the conventional bulb cannot be nearly 360. Degree of light distribution. In addition, as the US Energy Star's specification for light-emitting diode bulbs is announced, more and more LED emitters have shifted the light efficiency they have valued to light quality. In other words, it is more important for the light distribution angle of the light-emitting diode bulb.

Therefore, how to provide a light-emitting device and a composite lens thereof to enhance the light angle to achieve high-angle light distribution has become one of the important topics.

In view of the above problems, an object of the present invention is to provide a light-emitting device and a composite lens thereof capable of increasing a light angle to achieve high-angle light distribution.

To achieve the above object, a light emitting device according to the present invention comprises a light emitting module and a composite lens. The composite lens is disposed above the light emitting module. The composite lens includes a first lens portion, a second lens portion, a third lens portion, and a fourth lens portion. The second lens portion surrounds and connects the first lens portion. The third lens portion surrounds and connects the second lens portion. The fourth lens portion is disposed to be disposed below the third lens portion. The first lens portion emits a first group of light rays emitted from the light emitting module by the first lens portion in a total reflection manner. The second lens portion passes through the third lens portion and is emitted by the fourth lens portion by total reflection. The third lens portion emits a third group of light rays emitted from the light emitting module by the fourth lens portion in a total reflection manner. The fourth lens portion emits a fourth group of light rays emitted by the light emitting module from the fourth lens portion.

In an embodiment of the invention, the first lens portion, the second lens portion, the third lens portion and the fourth lens portion form an annular receiving space.

In an embodiment of the invention, the light emitting module further comprises a substrate, three or more light emitting diodes, and a driving circuit. The light emitting diodes are arranged on the substrate and disposed in the annular receiving space. The driving circuit is electrically connected to the light emitting diode and illuminates the light emitting diode.

In an embodiment of the invention, the light emitting device further includes a lamp cover, a base and a base. The lampshade has an accommodating space for accommodating the light-emitting module and the composite lens. The base is coupled to the lamp cover and carries the light module and the composite lens. The base is engaged with the base. The base has a heat dissipation structure.

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

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

In an embodiment of the invention, the first lens portion has a light distribution angle of 0 to 45 degrees and 315 to 360 degrees, and the second lens portion has a light distribution angle of 0 to 90 degrees and 270 to 360 degrees, and the third lens The light distribution angle of the portion is 90 to 150 degrees and 210 to 270 degrees, and the light distribution angle of the fourth lens portion is 0 to 90 degrees and 270 to 360 degrees.

In an embodiment of the invention, the first group of rays are refracted via a first surface of the first lens portion, and the second surface of the first lens portion is totally reflected and the third surface of the first lens portion is refracted to be emitted.

In an embodiment of the invention, the second group of rays are refracted via a first surface of the second lens portion, and the second surface of the second lens portion is totally reflected, passes through the third lens portion and is formed by the fourth lens portion A first surface is refracted and emitted.

In an embodiment of the invention, the third group of rays are refracted through the first surface of one of the third lens portions, and the second surface of the third lens portion is totally reflected and the first surface of the fourth lens portion is refracted to be emitted.

In an embodiment of the invention, the fourth group of rays are refracted by the second surface of one of the fourth lens portions and the first surface of the fourth lens portion is refracted.

To achieve the above object, a composite lens according to the present invention comprises a first lens portion, a second lens portion, a third lens portion and a fourth lens portion. The second lens portion surrounds and connects the first lens portion. The third lens portion surrounds and connects the second lens portion. The fourth lens portion is disposed to be disposed below the third lens portion.

In an embodiment of the invention, the first lens portion, the second lens portion, the third lens portion and the fourth lens portion form an annular receiving space.

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

According to the above aspect, a light-emitting device and a composite lens thereof according to the present invention emit a first group of light rays emitted from a light-emitting module by a first lens portion by a first lens portion in a total reflection manner; The lens portion emits a second group of light rays emitted from the light emitting module by the fourth lens portion in a total reflection manner; and the third lens portion emits a third group of light rays by the total reflection mode The fourth lens portion emits and a fourth group of light rays emitted from the light-emitting module is emitted from the fourth lens portion by the fourth lens portion, thereby realizing a light-emitting device that enhances the light-emitting angle to achieve high-angle light distribution.

Hereinafter, a light-emitting device and a composite lens thereof according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same elements will be described with the same reference numerals.

First, please refer to FIG. 2A and FIG. 2B, which are respectively a schematic view and a cross-sectional view of a light-emitting device 2 according to a preferred embodiment of the present invention. The light emitting device 2 includes a light emitting module 21 and a compound 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 can be a circuit board, and the light emitting diode 212 is mounted on one surface 2111 of the substrate 211 in an annular arrangement. In order to reduce the volume of the light-emitting module 21, the light-emitting diode 212 can be a wafer-type light-emitting diode. Of course, the light-emitting diode 212 can also be a pin-type (DIP) light-emitting diode. In addition, the driving circuit 213 is disposed on the substrate 211 and electrically connected to the LED 212, preferably disposed on the other surface 2112 opposite to the LED 212. The driving circuit 213 is formed by the wiring on the substrate 211. The light-emitting diode 212 is controlled to be lit or not.

It should be noted that in the present embodiment, the light-emitting module 21 has eight light-emitting diodes 212 as an example. However, in actual use, it can be used according to product requirements and design considerations. Different numbers of light-emitting diodes. In general, the present embodiment is applicable to a plurality of light-emitting diodes in an amount of three or more. 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 diode 212. The material of the composite lens 22 may be a light transmissive polymer material, such as polymethly Methacrylate (PMMA), polystyrene (PS), methyl methacrylate-styrene (Methly). -methacrylate-Styrene, MS) or polycarbonate (Polycarbonate, PC) and the like.

Referring to FIG. 2B , in the embodiment, the composite 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 portion 221 is located at a central portion of the composite lens 22, the second lens portion 222 is surrounded and connected to the first lens portion 221, the third lens portion 223 surrounds and connects the second lens portion 222, and the fourth lens portion 224 is disposed around Below the third lens portion 223. The first lens portion 221, the second lens portion 222, the third lens portion 223, and the fourth lens portion 224 are formed with an annular accommodating space 225, and the light-emitting diode 212 is disposed in the annular accommodating space 225. Further, the first lens portion 221, the second lens portion 222, the third lens portion 223, and the fourth lens portion 224 may be integrally formed.

In the embodiment, the first lens portion 221 transmits a first group of light rays emitted from the light-emitting diode 212 of the light-emitting module 21 by the first lens portion by means of at least one total internal reflection (TIR). 221 shot. The second lens portion 222 passes the second group of light rays emitted from the light-emitting module 21 through the third lens portion 223 and is emitted by the fourth lens portion 224 at least once. The third lens portion 223 emits a third group of light rays emitted from the light-emitting module 21 from the fourth lens portion 224 by at least one total reflection. The fourth lens portion 224 emits a fourth group of light rays emitted from the light-emitting module unit 21 from the fourth lens portion 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 differently according to the requirements of the product or the design considerations. Please refer to FIG. 3A to FIG. 3C below. For example, three implementation architectures of the light-emitting module 21 are illustrated.

As shown in FIG. 3A, the light emitting module 21 has three light emitting diodes 212. 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 light-emitting diodes 212 are arranged in a dislocation manner to form a double-ring arrangement. As shown in FIG. 3C, the light-emitting module 21 also has sixteen light-emitting diodes 212, and is different from FIG. 3B in that the two-ring arrayed light-emitting diodes 212 are arranged in the same radial direction.

In this embodiment, the light-emitting diodes 212 of the light-emitting module 21 are disposed on the substrate 211 in an equally spaced arrangement, an irregular arrangement, and a double-ring arrangement, and may be arranged in a three-ring or three-ring arrangement. Mounted on the substrate 211.

4A to 4D, 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 beams L ₁₁ to L ₁₄ are further explained. The relationship between the second group of rays L ₂₁ to L ₂₄ , the third group of rays L ₃₁ to L _{34 ,} and the fourth group of rays L ₄₁ to L ₄₄ . Among them, the angles described below are based on the Y axis.

As shown in FIG. 4A, the first lens portion 221 of the embodiment has a first surface S ₁ , a second surface S _{2 ,} and a third surface S ₃ . Emitting light emitting diode module 21 of the light emitted by the first group 212 L ₁₁ ~ L ₁₄ refracted through the first surface S _1, S ₂ by the second surface is totally reflected and then refracted through the third surface S ₃ and Shoot out. Therefore, the first group of rays L ₁₁ to L ₁₄ emitted by the third surface S ₃ may cover a range of 90 degrees. In other words, the light distribution angle of the first lens portion 221 is 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 rays L ₂₁ to L ₂₄ emitted from the LED 222 are refracted by the first surface S ₄ of the second lens portion 222 and totally reflected by the second surface S _{5 of the} second lens portion 222 The third lens portion 223 is further emitted by the refraction of the first surface S ₆ of one of the fourth lens portions 224. The second group of light rays L ₂₁ to L ₂₄ are 0 to 90 degrees and 270 to 360 degrees through the irradiation area of the second lens portion 222.

4C, the third lens portion 223 having a first surface and a second surface S ₇ S _8. The third group of light rays L ₃₁ to L ₃₄ emitted from the light-emitting diode 212 are refracted by the first surface S ₇ of the third lens portion 223 and totally reflected by the second surface S _{8 of the} third lens portion 223, and then The first surface S ₆ of the fourth lens portion 224 is refracted and emitted. Therefore, the third lens portion 223 distributes the third group of light beams L ₃₁ to L ₃₄ so that the irradiation area is 90 to 150 degrees and 210 to 270 degrees. Further, in the present embodiment, the second portion 222 of the first _{lens. 4} and the surface S of the first surface S of the third lens portion ₂₂₃₇ is a surface extension of each other, and the second lens portion of the second surface _{222. 5} S The second surface S _{8 of the} third lens portion 223 has a different radius of curvature.

4D, the fourth lens portion 224 includes a first surface and a second surface S ₆ S _9. The fourth group of light rays L ₄₁ to L ₄₄ emitted from the light-emitting diode 212 are refracted by the second surface S ₉ of the fourth lens portion 224 and are then emitted by the refraction of the first surface S ₆ of the fourth lens portion 224. Therefore, the fourth lens portion 224 distributes the fourth group of light beams L ₄₁ to L ₄₄ so that the irradiation area is 0 to 90 degrees and 270 to 360 degrees.

In addition, it is worth mentioning that at least one surface of the composite lens 22 has a microstructure P (as shown in FIG. 4A). In this embodiment, the surface S ₁₀ of the first lens portion 221 disposed adjacent to the third surface S ₃ has a microstructure P, and the second surface S _{9 of the} fourth lens portion 224 has a microstructure P as an example. The arrangement of the structure P will effectively homogenize the light emitted by the light-emitting diode 212. Wherein, the aforementioned microstructure P can be made by ink printing, etching, laser or precision machining. Further, the cross-sectional shape of the microstructure P is selected from one of a wave shape, an arc shape, a line shape, a triangle shape, a polygon shape, and an irregular shape.

Therefore, with the above disclosed structure, the composite 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, referring to FIG. 5 , the light-emitting device 2 further includes a lamp cover 23 , a base 24 and a base 25 . The lamp cover 23 has an accommodating space 231 for accommodating the light-emitting module 21 and the composite lens 22. The material of the lamp cover 23 can be glass or a light-transmitting polymer material. The base 24 is coupled to the lamp cover 23 and is configured to carry the light-emitting module 21 and the composite lens 22 . In addition, the base 24 may be made of metal, plastic or a combination of the two, and the base 24 may be an integrally formed member or a member composed of a plurality of components. In practice, the base 24 can be a plurality of openings, fins or other forms of heat dissipation structure for use as heat convection and heat transfer. In addition, one end of the lamp cap 25 is coupled to the base 24, and the other end is connected to a lamp holder (not shown) and receives an external power source for the illumination module 21 to emit light.

In addition, another embodiment of the present invention discloses a composite lens including a first lens portion, a second lens portion, a third lens portion, and a fourth lens portion. The second lens portion surrounds and connects the first lens portion, and the third lens portion surrounds and connects the second lens portion. The fourth lens portion is disposed to be disposed below the third lens portion.

Since the features and effects of the composite lens of the present embodiment are the same as those of the composite lens of the previous embodiment, they are not described herein.

In summary, a light-emitting device and a composite lens thereof according to the present invention emit a first group of light rays emitted by the light-emitting module from the first lens portion by the first lens portion in a total reflection manner; The second lens portion emits a second group of light rays emitted by the light emitting module from the fourth lens portion in a total reflection manner; and the third lens portion emits a third group of light rays by the light emitting module in a total reflection manner. A fourth group of light rays emitted from the fourth lens portion and emitted by the light emitting module by the fourth lens portion are emitted from the fourth lens portion. Thereby, a light-emitting device that enhances the light-emitting angle to achieve a high-angle light distribution is realized.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1. . . Light-emitting diode lamp

11, 212. . . Light-emitting diode

12. . . Circuit board

2. . . Illuminating device

twenty one. . . Light module

211. . . Substrate

2111, 2112. . . surface

213. . . Drive circuit

twenty two. . . Compound lens

221. . . First lens portion

222. . . Second lens portion

223. . . Third lens portion

225. . . Fourth lens portion

225. . . Ring accommodation space

twenty three. . . lampshade

231. . . Housing space

twenty four. . . Base

25‧‧‧ lamp holder

L ₁₁ ~L ₁₄ ‧‧‧The first group of light

L ₂₁ ~L ₂₄ ‧‧‧Second group of light

L ₃₁ ~L ₃₄ ‧‧‧The third group of light

L ₄₁ ~L ₄₄ ‧‧‧fourth group of light

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

1 is a schematic view of a conventional light-emitting diode lamp;

2A is a schematic view 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 in accordance with a preferred embodiment of the present invention;

3A-3C are schematic diagrams showing different aspects of a light emitting module according to a preferred embodiment of the present invention;

4A-4D are schematic views of a composite lens in accordance with a preferred embodiment of the present invention;

FIG. 5 is a schematic diagram of a light emitting device in accordance with a preferred embodiment of the present invention.

2. . . Illuminating device

twenty one. . . Light module

211. . . Substrate

2111, 2112. . . surface

212. . . Light-emitting diode

twenty two. . . Compound lens

Claims (12)

A light-emitting device comprising: a light-emitting module; and a composite lens disposed above the light-emitting module, the composite lens comprising: a first lens portion; a second lens portion surrounding and connecting the first lens portion; a third lens portion surrounding and connecting the second lens portion; and a fourth lens portion disposed around the third lens portion, wherein the first lens portion is totally reflective, and the light emitting module is Transmitting one of the first group of rays from the first lens portion, the second lens portion is totally reflective, and the second group of rays emitted by the light emitting module passes through the third lens portion and is fourth The lens portion is emitted, and the third lens portion emits a third group of light rays emitted by the light emitting module from the fourth lens portion by total reflection, and the fourth lens portion emits one of the light emitting modules Four groups of rays are emitted by the fourth lens portion. The illuminating device of claim 1, wherein the first lens portion, the second lens portion, the third lens portion and the fourth lens portion form an annular accommodating space. The illuminating device of claim 2, wherein the illuminating module further comprises: a substrate; three or more illuminating diodes arranged on the substrate and disposed on the illuminating device And a driving circuit electrically connecting the light emitting diodes and illuminating the light emitting diodes. The illuminating device of claim 1, further comprising: a lamp cover having an accommodating space for accommodating the illuminating module and the composite lens; a base engaged with the hood and carrying the illuminating dies And the composite lens; and a base for engaging the base. The illuminating device of claim 4, wherein the base has a heat dissipation structure. The illuminating device of claim 1, wherein at least one surface of the composite lens has a microstructure. The light-emitting device according to claim 1, wherein the first lens portion, the second lens portion, the third lens portion, and the fourth lens portion are integrally formed. The light-emitting device of claim 1, wherein the light distribution angle of the first lens portion is 0 to 45 degrees and 315 to 360 degrees, and the light distribution angle of the second lens portion is 0 to 90 degrees and 270. Up to 360 degrees, the light distribution angle of the third lens portion is 90 to 150 degrees and 210 to 270 degrees, and the light distribution angle of the fourth lens portion is 0 to 90 degrees and 270 to 360 degrees. The illuminating device of claim 1, wherein the first group of rays are refracted via a first surface of the first lens portion, the first The second surface of one of the lens portions is totally reflected and the third surface of the first lens portion is refracted and emitted. The illuminating device of claim 9, wherein the second group of rays are refracted via a first surface of the second lens portion, and the second surface of the second lens portion is totally reflected through the third The lens portion is refracted by the first surface of one of the fourth lens portions to be emitted. The illuminating device of claim 10, wherein the third group of rays are refracted via a first surface of the third lens portion, and the second surface of the third lens portion is totally reflected and the fourth lens portion The first surface is refracted and emitted. The illuminating device of claim 11, wherein the fourth group of rays are refracted by the second surface of one of the fourth lens portions and the first surface of the fourth lens portion is refracted.