TWI631732B - Illuminating device - Google Patents

Abstract

A light-emitting device comprises a substrate, a light-emitting unit disposed on the substrate, a reflective member disposed on the substrate and surrounding the light-emitting unit, and a lens. The light emitting unit includes a light emitting diode chip disposed on the substrate. The lens covers the light emitting unit and at least partially the reflective member, and the lens includes an outer surface having a plurality of microstructures. Through the microstructure on the outer surface of the lens, the light distribution can be made uniform, and with the arrangement of the reflector, the lateral light can be reflected to the positive light to improve the forward light output.

Description

Illuminating device

The present invention relates to a light-emitting element, and more particularly to a light-emitting device.

Green energy technology, which is environmentally friendly and energy-saving, has attracted much attention due to global warming and energy depletion. LED has the advantages of low energy, high luminous efficiency, long life, not easy to break, and toxic substances such as mercury. It has become the focus of development in various countries. LED is a newly developed light source and must be considered to have an impact on human health. Because the LED is small in size but strong in directivity, it is greatly different from natural sunlight, and it is easy to cause problems such as uneven color of light, uneven color temperature, and uneven distribution of spatial brightness, which causes the human body to feel uncomfortable.

Furthermore, at present, a weak point in the light color performance of white LEDs is the generation of yellow halos, and the generation of yellow halos causes the light to appear inconsistently distributed in the space, which will have an adverse effect on the human eye. Especially bad effects with young people.

Accordingly, it is an object of the present invention to provide a light-emitting device which has a good light-sharing effect while improving the forward light-emitting rate.

Therefore, the light-emitting device of the present invention comprises a substrate, a light-emitting unit disposed on the substrate, a light-emitting unit disposed on the substrate, and surrounding the light-emitting unit a reflector of the element, and a lens. The light emitting unit includes at least one light emitting diode wafer. The lens covers the light emitting unit and at least partially the reflective member, and the lens includes an outer surface having a plurality of microstructures.

The effect of the invention is that the light distribution on the outer surface of the lens can make the light distribution uniform, and the light of the lateral light can be reflected to the positive light output to improve the forward light extraction rate.

2‧‧‧Lighting device

21‧‧‧Substrate

22‧‧‧Lighting unit

221‧‧‧Light Emitter Wafer

222‧‧‧Fluorescent rubber layer

23‧‧‧Reflecting parts

231‧‧‧ bottom

232‧‧‧ outer wall

233‧‧‧ sloped surface

234‧‧‧ top surface

235‧‧‧ inner wall

236‧‧‧reflective layer

24‧‧‧ lens

241‧‧‧ outer surface

242‧‧‧Fluorescent particles

H‧‧‧ Height

D‧‧‧thickness

Θ‧‧‧ angle

Other features and advantages of the present invention will be apparent from the embodiments of the present invention, wherein: Figure 1 is a side view showing a first preferred embodiment of the illuminating device of the present invention; Figs. FIG. 4 is a side view showing a second preferred embodiment of the illuminating device of the present invention; FIG. 5 is a side view of the illuminating device of the present invention; FIG. 6 is a side elevational view showing another embodiment of the reflecting member in the second preferred embodiment; FIG. 6 is a side view showing the second preferred embodiment; FIG. FIG. 7 is a side elevational view showing a different arrangement of a lens in the second preferred embodiment; FIG. 8 is a side elevational view showing a third preferred embodiment of the light-emitting device of the present invention; FIG. Is a side view showing a fourth of the light-emitting device of the present invention Preferred Embodiments; and FIG. 10 is a side elevational view showing different aspects of the uniformizing effect in the fourth preferred embodiment.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 1 , a first preferred embodiment of a light-emitting device 2 of the present invention comprises a substrate 21 , a light-emitting unit 22 disposed on the substrate 21 , and a reflection disposed on the substrate 21 and surrounding the light-emitting unit 22 . Piece 23, and a lens 24. The light-emitting unit 22 includes a light-emitting diode chip 221 disposed on the substrate 21, and the reflective member 23 surrounds the light-emitting diode wafer 221 and includes a bottom surface 231 attached to the substrate 21, and a bottom surface An outer wall surface 232 extending from a direction away from the substrate 21, an inner wall surface 235 extending from an inner edge of the bottom surface 231 away from the substrate 21, and a connecting inner wall surface 235 and the outer wall surface 232 Top 234. The shape of the top surface 234 may be a plane. As shown in FIG. 1 , the shape of the vertical cross section of the reflector 23 is illustrated by a square, but may also be a rectangular shape as shown in FIG. 2 , or As shown in FIG. 3, the shape of the top surface 234 is a curved surface, and the shape of the vertical cross section of the reflecting member 23 is a bullet shape.

As shown in FIG. 1, the height H of the reflecting member 23 (this is the maximum vertical height) is greater than the thickness d of the LED wafer 221. In addition, in this embodiment, the lens 24 is disposed on the substrate 21 and completely covers the light emitting unit 22 and the reflective member 23, and the lens 24 includes a complex A plurality of microstructured outer surfaces 241. It should be noted that, in this embodiment, the surface shape of the microstructure is illustrated by a sharp angle, but it may be a step, an arc, or a combination thereof, and is not limited thereto. Wherein, if the arc-shaped microstructure is microscopically viewed, it is equivalent to providing a plurality of small lenses on the lens 24 which already has an improved light extraction efficiency, so that in addition to the uniform light function, the arc-shaped microstructures are simultaneously It is also possible to increase the light extraction efficiency of the light-emitting device 2.

It should be noted that, in the embodiment, the light emitting unit 22 only shows one light emitting diode wafer 221, but the light emitting unit 22 may also include a plurality of light emitting diode chips disposed on the substrate 21. 221, the user can select a plurality of monochromatic light-emitting diode chips 221 or a plurality of multi-color light-emitting diode chips 221 to be used by themselves, which is not limited by the embodiments.

The illuminating device 2 of the present invention transmits the microstructure on the outer surface 241 of the lens 24 to uniformly distribute the light, and the height H of the reflecting member 23 is greater than the thickness d of the illuminating diode 221, and the side can be surely Reflecting light to positive light, increasing forward light output. Wherein, the width and height of the microstructures are greater than the light-emitting wavelength of the light-emitting unit 22 and less than 10 micrometers, because if the width and height of the microstructure are smaller than the light-emitting wavelength of the light-emitting unit 22, the light directly penetrates the microstructure without Refraction occurs. If the width and height of the microstructure are greater than 10 microns, the process is not easy to achieve. In addition, the two adjacent microstructures are spaced apart from each other by a pitch which is less than 5 micrometers, so that a better refractive effect can be obtained. Most preferably, the area occupied by the microstructures on the outer surface 241 is relative to the surface area of the entire outer surface 241. The ratio is between 65% and 99%, and such a high density microstructure distribution can make the lens 24 have a more uniform light effect.

It is worth mentioning that when the shape of the vertical cross section of the reflecting member 23 is a bullet shape as shown in FIG. 3, the top surface 234 of the curved surface can make the lateral light of the light emitting unit 22 have multi-angle refraction. In the direction, the user can adjust the curvature design of the top surface 234 according to the desired light shape, so that the reflection member 23 can not only improve the forward light extraction rate of the light-emitting device 2, but also have the effect of adjusting the light shape.

Referring to FIG. 4, a second preferred embodiment of the light-emitting diode device 2 of the present invention is substantially the same as the first preferred embodiment except that the reflective member 23 includes a surface mounted on the substrate 21. a bottom surface 231, an outer wall surface 232 extending from the outer edge of the bottom surface 231 away from the substrate 21, and an inclined surface 233 connecting the outer wall surface 232 and the inner surface of the bottom surface 231. The curvature of the inclined surface 233 may be 0, so that the shape of the vertical cross section of the reflecting member 23 is a triangle, or the curvature of the inclined surface 233 may not be 0 (not shown), that is, the inclined surface 233 may be a curved surface for the convenience of the user. The light emitting pattern of the LED chip 221 is used to adjust the curvature of the inclined surface 233. Preferably, the curvature of the inclined surface 233 is greater than 0, so that the LED device 2 has better light output. effectiveness. As a matter of course, as shown in FIG. 5 , the reflector 23 further includes a top surface 234 connecting the outer wall surface 232 and the inclined surface 233 and parallel to the bottom surface 231 to enable the reflective member 23 . The shape of the vertical section is trapezoidal. In this embodiment, the angle θ between the inclined surface 233 and the bottom surface 231 is between 1 and 50 degrees. When the angle θ falls within the range, the inclined surface 233 may have The lateral light of the light-emitting unit 22 is effectively utilized, and is reflected and forwardly emitted. Preferably, when the angle θ between the inclined surface 233 and the bottom surface 231 is between 15 degrees and 25 degrees, the amount of light emitted can be increased by at least 20%, so that the light extraction efficiency of the light-emitting device 2 can be effectively improved. It should be noted that the reflective member 23 itself may be made of a material having a reflectance greater than 90%, or may be reflected by a reflective layer 236 disposed on the inclined surface 233 as shown in FIG. .

It should be noted that, in FIG. 4, the lens 24 is disposed on the reflector 23 and covers the light-emitting unit 22 and a portion of the reflector 23. Of course, as shown in FIG. 7 , the lens 24 is disposed on the substrate 21 and completely covers the light emitting unit 22 and the reflector 23 . Thereby, not only can another aspect of the illumination device 2 be provided, but the lens 24 can have a uniform light effect for all light reflected through the inclined surface 233, improve light uniformity, and can also protect the reflective member. The effect of 23 can also increase the adhesion between the lens 24 and the substrate 21, thereby improving the reliability of the light-emitting device 2.

In this embodiment, the reflector 23 has a low inner and outer height. Therefore, the light emitted laterally can be reflected by the inclined surface 233 of the reflector 23 or the reflective layer 236 disposed on the inclined surface 233. , can improve the positive light output rate. In addition, by changing the angle of the angle θ, it is also possible to adjust the desired light pattern, and combined with the uniform light effect of the microstructure on the outer surface 241 of the lens 24, the light source can be effectively utilized to achieve energy saving effect. It can also make the lighting environment more comfortable and ergonomic.

Referring to FIG. 8, a third preferred embodiment of the illuminating device 2 of the present invention is substantially the same as the second preferred embodiment except that a plurality of microstructures are formed on the inclined surface 233 of the reflecting member 23. In addition to the same effect as the second preferred embodiment, the embodiment can also adjust the desired light pattern through the microstructure. Therefore, the light-emitting device 2 of the embodiment has undergone two microstructures. After the action (the microstructure of the reflector 23 and the microstructure of the lens 24), the emitted light will be more uniform, and the angle of the angle θ is changed to make the adjustment of the light-emitting type more flexible and convenient.

In addition, the microstructure may also be disposed on the inner wall surface 235 of the reflecting member 23 as shown in FIG. 1, FIG. 2, and FIG. 3. Similarly, the light emitted by the light emitting unit 22 may be subjected to two microstructures ( The microstructure of the reflector 23 and the microstructure of the lens 24 can thereby make the light-emitting device 2 more uniform. It should be noted that, in this embodiment, the surface shape of the microstructure on the reflective member 23 may be a pointed shape, a stepped shape, an arc shape, or a combination thereof, and is not limited thereto.

Referring to FIG. 9 , a fourth preferred embodiment of the illuminating device 2 of the present invention is substantially the same as the second preferred embodiment, except that the illuminating unit 22 further includes a light-emitting diode 221 . The fluorescent glue layer 222. Through the arrangement of the phosphor layer 222, the light emitted by the LED wafer 221 can be mixed to increase the color variability of the light. Of course, in actual implementation, the phosphor layer 222 may not be disposed, but as shown in FIG. 10, the lens 24 is doped with a plurality of phosphor particles 242, and the particle size of each of the phosphor particles 242 is between 3 microns to 50 micro Between meters. Through the fluorescent particles 242, the light emitted by the LED 221 can also be mixed, and the microstructure of the outer surface 241 of the lens 24 can be used to make the light color uniform. If the blue light emitting diode chip 221 is used with the yellow fluorescent glue layer 222 or the yellow fluorescent particles 242, the yellow light phenomenon of the white light after the light mixing can be obviously improved, and the human eye can feel comfortable.

In summary, the illuminating device 2 of the present invention can make the light distribution uniform through the microstructure on the outer surface 241 of the lens 24. If applied to the illuminating device 2 emitting white light, the yellow halo phenomenon can be significantly improved. The reflector 23 is configured to reflect the laterally emitted light to the forward light, improve the forward light extraction rate, and cooperate with changing the angle θ of the reflector 23, the reflective layer 236, and the microstructure to cooperate with each other. The adjustment of the type is more flexible and more convenient, so the object of the invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

Claims (10)

A light-emitting device comprising: a substrate; a light-emitting diode chip disposed on the substrate; a reflective member disposed on the substrate, the reflective member contacting and surrounding the light-emitting diode wafer and having a reflective inclined surface a phosphor layer disposed on the LED chip; and a light transmissive layer covering the LED chip and positioned between the LED chip and the reflector. A light-emitting device comprising: a substrate; a light-emitting diode chip disposed on the substrate; a reflective member disposed on the substrate, the reflective member contacting and surrounding the light-emitting diode wafer and having a reflective inclined surface a phosphor layer disposed on the LED chip; and a light transmissive layer covering the LED chip, wherein the light transmissive layer contacts the LED chip, the reflective inclined surface and the Fluorescent glue layer. A light-emitting device comprising: a substrate; a light-emitting diode chip disposed on the substrate; a reflective member disposed on the substrate, the reflective member contacting and surrounding the light-emitting diode wafer and having a reflective inclined surface And a light transmissive layer comprising a plurality of phosphor particles, the light transmissive layer covering the A light emitting diode chip and the reflecting member. The illuminating device of claim 1 or 2 or 3, wherein the reflecting member comprises a bottom surface attached to the substrate, and an outer wall surface extending from the outer edge of the bottom surface away from the substrate, the reflection The inclined surface connects the outer wall surface and the inner edge of the bottom surface. The illuminating device of claim 4, wherein the reflective inclined surface has a plurality of microstructures. The light-emitting device of claim 1 or 2 or 3, wherein the surface of the light transmissive layer has a plurality of microstructures. The illuminating device of claim 6, wherein a ratio of an area occupied by the microstructure on a surface of the light transmissive layer to an area of the entire surface is between 65% and 99%. The light-emitting device of claim 1 or 2 or 3, wherein the light-transmissive layer is disposed on the substrate and completely covers the light-emitting diode wafer and the reflective inclined surface. The light-emitting device according to claim 1 or 2, wherein the light-transmitting layer is doped with a plurality of fluorescent particles. The illuminating device of claim 1 or 2 or 3, wherein the illuminating device has a side plane comprising at least a portion of the substrate and a portion of the reflecting member.